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[TRANSLATION]                           
                              OPERATING AGREEMENT
                                        
                              Dated July 29, 1997
                                        
                                    between
                                        
                                 LAGOVEN, S.A.
                                        
                                      and
                                        
                         UNION TEXAS VENEZUELA LIMITED
                                        
                                      and
                                        
                             PREUSSAG ENERGIE GMBH

                                        
                                    BOQUERON


LEGEND

* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
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                               TABLE OF CONTENTS
 

   
                                                                                                       PAGE
                                                                                                       ----
                                                                                                 
                                                                                                       

Clause I                            Definitions                                                           2
Clause II                           Object                                                               10    
Clause III                          Effectiveness; Guarantees; EPIC; Factor de Valorizacion              10
Clause IV                           Operating Services; Minimum Work Obligation                          13
Clause V                            Affiliate Approval Requirements                                      15             
Clause VI                           Development Plan                                                     17 
Clause VII                          Annual Work Programs and Budgets; AFEs                               19
Clause VIII                         Activities Outside Field Boundaries                                  22  
Clause IX                           Amendments to Development Plans                                      25        
Clause X                            The Operator                                                         27 
Clause XI                           Conduct of Operating Services                                        30   
Clause XII                          Title to and Use of Fixed Assets                                     38
Clause XIII                         Hydrocarbon Reservoirs Extending Outside the Area                    42   
Clause XIV                          Production Curtailment                                               43
Clause XV                           Title to and Transfer of Hydrocarbons; Royalties;                    44
                                    Transportation and Handling                      
Clause XVI                          Gas Disposition and Handling                                         46
Clause XVII                         Payment and Reimbursement                                            48
Clause XVIII                        Statements and Invoices                                              49   
Clause XIX                          Terms and Termination; Extensions                                    50    
Clause XX                           Default and Early Termination                                        52
Clause XXI                          Abandonment; Inactive Wells                                          54    
Clause XXII                         Environmental Matters                                                58
Clause XXIII                        Governing Law; Arbitration; Expert Opinion                           60
Clause XXIV                         Technology; Ownership of Information and Data; Access to             62   
                                    Facilities                                                              
Clause XXV                          Confidentiality                                                      63
Clause XXVI                         Force Majeure                                                        64
Clause XXVII                        Assignment; Change in Control                                        65   
Clause XXVIII                       Notices                                                              66    
Clause XXIX                         Miscellaneous                                                        68


Annex A                             Description of Area
Annex B                             Description of Initial Field
Annex C                             Accounting Procedures
Annex D                             Form of Contractor Guarantee
Annex E                             Development Plan Guidelines
Annex F                             Initial Contractor Participations
Annex G                             Form of Operator Accession Agreement
Annex H                             Delivery of Hydrocarbons
Annex I                             Baseline Production
Annex J                             Form of Operator Guarantee
Annex K                             Model Joint Operating Terms for EPIC 


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Annex L        Price Formula
Annex M        Form of Guarantee for Minimum Work Obligation
Annex M-2      Form of Financial Undertaking for Minimum Work Obligation
Annex N        Available Assets
Annex O        Form of Letter of Credit for Minimum Work Obligation
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                              OPERATING AGREEMENT

Operating Agreement dated July 29th, 1997, between LAGOVEN, S.A., a sociedad
anonima organized on the date of December 18, 1975 before the First Mercantile
Registry of the Judicial District for the Federal District and the State of
Miranda, Republic of Venezuela, under Number 56, Book 116-A (together with its
successors and assigns, the "Affiliate"), represented by JULIUS TRINKUNAS;
acting in this act as President of the company and UNION TEXAS VENEZUELA
LIMITED, an international business company organized on the date of January 10,
1996 in the Commonwealth of the Bahamas, represented in this act by NEWTON W.
WILSON, III acting in his capacity as President, and PREUSSAG ENERGIE GmbH, a
limited liability company organized on the date of January 1, 1993 in Germany,
represented in this act by RUDOLPH BERENDS, acting in his capacity as attorney
in fact (together with their respective successors and assigns, the
"Contractors"):

                                    RECITALS

A.   All Hydrocarbons existing within the territory of Venezuela are a national
     resource owned and controlled by the Republic of Venezuela.

B.   The Affiliate has the exclusive right to carry on all operations with
     respect to the Hydrocarbons in the Area (as defined herein).

C.   The Affiliate wishes to promote the development of the Area, and the
     Contractors wish to render services within the Area.

D.   The Contractors have the financial capacity, technical ability and
     professional expertise necessary to perform the Operating Services
     described herein.

E.   The Contractors have agreed to perform for the Affiliate, but at the risk
     and cost of the Contractors, those rehabilitation, reactivation,
     development, production, exploration and other activities as are required
     to achieve the continuous commercial development of the Hydrocarbons
     located in the Area, as further specifically set forth herein and as to be
     set forth in the Development Plans and Annual Work Programs and Budgets
     approved by the Affiliate.

F.   The Parties have agreed that the payment to the Contractors for the
     services rendered hereunder shall only include such payment as is
     established in Clause XVII (and the direct reimbursement of certain
     specified expenses as provided elsewhere in this Agreement), and that the
     Contractors shall not have any title to the Hydrocarbons located or
     produced in the Area.

G.   The Parties have agreed that the rights of the Contractors derived herefrom
     do not include any right to the economic benefits resulting from the sale 
     or disposal by the Affiliate of the Hydrocarbons extracted for the Area, 
     but only those economic
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     interests as may be granted to the Contractors hereunder in their
     capacities as contractors, for the Operating Services described herein.

NOW, THEREFORE, the Parties hereby agree on the following terms and conditions
to govern their Agreement:


                                       I

                                  DEFINITIONS

The following terms shall have the following meanings for purposes of this
Agreement:

"Accounting Procedures" shall mean the accounting procedures attached hereto as
Annex C, as amended or supplemented from time to time in accordance with this
Agreement.

"Accumulation" shall mean any group of Hydrocarbon-bearing reservoirs,
formations or deposits that would ordinarily be considered a single field in
accordance with International Oil Industry Standards; provided that, unless
otherwise agreed by the Affiliate in its discretion, no Hydrocarbon-bearing
reservoirs, formations or deposits lying at depths below the lower horizon of
the Field Boundary of the Initial Field will be deemed to constitute an
"Accumulation" with the Initial Field.

"AFE" shall mean an authorization for expenditures meeting the requirements of
the Uniform Reporting System.

"Affiliate" shall have the meaning set forth in the first paragraph of this
Agreement.

"Agreement" shall mean this Operating Agreement, including all schedules,
exhibits and annexes hereto, as amended or supplemented from time to time.

"Annual Work Program and Budget" shall mean, for any Calendar Year, a work
program and budget prepared and submitted by the Contractors to the Affiliate
and approved by the Affiliate in accordance with Clause 7.3, as amended or
supplemented from time to time in accordance with this Agreement.

"Area" shall mean the "Area" specified in Annex A hereto, as reduced through
the partial termination of this Agreement pursuant to Clause 19.2.

"Associated Entity" shall mean, with respect to any Person, any other Person
that, directly or indirectly, controls, is controlled by or is under common
control with such Person, whether through ownership of voting securities or
otherwise.  For this purpose, and without limiting the foregoing, (i) any
Person that owns more than 50% of the outstanding voting securities (or
equivalent ownership interests) of another Person shall be deemed to control
such Person, and (ii) any Person that owns at least 30% of the outstanding
voting securities (or equivalent


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ownership interests) of another Person that is acting as Operator pursuant to
Clause X and has executed a guarantee with respect to such Operator in the form
of Annex J shall be deemed to control such Operator in its capacity as Operator
(but not in its capacity as Contractor if such Person is also a Contractor).
Notwithstanding the foregoing, no sovereign, government, ministry, governmental
agency (other than a commercial entity acting in a commercial capacity) or
political subdivision of any sovereign shall be considered as Associated Entity
of any Party.

"Associated Gas" shall mean Natural Gas produced from a Field other than a Free
Gas Discovery. Any volume of Natural Gas that is supplied by the Affiliate from
outside the Area (including any Natural Gas previously delivered to the
Affiliate by the Contractors), injected into a well for purposes of gas lift
and subsequently recovered will not be considered to have been produced from
the Field concerned.

"Barrel" or "barrel" shall mean a quantity consisting of 42 United States
gallons, corrected to a temperature of 60 degrees Fahrenheit under one
atmosphere of pressure.

"Baseline Gas" shall have the meaning set forth in Clause 16.2.

"Baseline Production" shall mean, for any Quarter, a volume of Production of
Liquid Hydrocarbons in such Quarter, determined as follows:

*


* Confidential portion has been omitted pursuant to a request for confidential 
  treatment and filed separately with the Commission.



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"Baseline Production Decline Factor" shall mean the fraction, expressed as a
decimal, of the annual decline in Baseline Production as stated in Annex I.

"Business Day" shall mean any day other than a Saturday, a Sunday or a day on
which commercial banks in Caracas are authorized or required to close by law,
decree, regulation or resolution or by decision of the Consejo Bancario
Nacional of Venezuela or any successor entity.

"Calendar Year" shall have the meaning set forth in the Accounting Procedures.

"Capital Expenditures" shall have the meaning set forth in the Accounting
Procedures. 

"Chargeable Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Connected" shall mean, with respect to two or more Hydrocarbon-bearing
structures, formations or deposits, that such structures, formations or
deposits have been reasonably demonstrated (i) by geologic and engineering
interpretations to be geologically continuous in the Hydrocarbon-bearing
section, (ii) by appropriate technical means to be in pressure communication
with one another in the Hydrocarbon phase, or (iii) to constitute an
Accumulation.

"Contractors" shall have the meaning set forth in the first paragraph of this
Agreement, and shall also include EPIC upon the execution by EPIC of a
counterpart of this Agreement pursuant to Clause 3.3.

"Contractor Well" shall mean any well that the Contractors have either drilled
or used in the Area for any purpose during the term of this Agreement. Any
production or injection well that is used for commercial production in the Area
as of the Takeover Date will be conclusively considered a "Contractor Well".

"Delivery Point" shall mean the point or points at which Production is to be
delivered by the Contractors to the Affiliate, as specified in Annex H hereto,
or as otherwise specified from time to time in accordance with Clause 15.3.

"Delivery Point Capacity" shall mean, for any time period and Delivery Point,
and for Hydrocarbons of any type and quality, the maximum volume of Production
of Hydrocarbons of such type and quality that the Contractors are authorized
to deliver at such Delivery Point, as specified in Annex H, as modified from
time to time in accordance with Clause 15.3.

"Development Plan" shall mean, with respect to any Field, such plan as the
Contractors submit to the Affiliate and that the Affiliate approves pursuant
to Clause 6.3 or 8.5, in each case meeting the requirements set forth in Annex 
E hereto (to the extent applicable to such Field) and the requirements of Clause
6.2, and in each case as amended from time to time in accordance with this 
Agreement.

"Dry" shall mean, as applied to any Natural Gas, such Natural Gas after the
extraction of propane, butane and similar liquids that may be removed by
extraction.




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"Effective Date" shall mean the date of execution of this Agreement by the
Other Contractors and the Affiliate.

"Environmental Claim and Cleanup Liability" shall mean: (a) any liabilities,
costs or expenses arising from or relating to any claim by a Venezuelan
governmental authority or other third party pursuant to Environmental Law for
personal injury, property damage, or damage to natural resources or the
environment (whether based on negligent acts or omissions, statutory liability,
or strict liability without fault or otherwise), in connection with the Area or
the activities or operations conducted therein; (b) any liabilities, costs or
expenses arising from or relating to any investigation, study, remediation or
abatement of any Release, to the extent required by Environmental Law, in
connection with the Area or the activities or operations conducted therein; or
(c) any fines or penalties assessed for non-compliance with Environmental Law
in connection with the Area or the activities or operations conducted therein. 


"Environmental Law" shall mean any Law or Decision relating to: (a)
conservation, improvement, protection, pollution, contamination or remediation
of the environment; (b) any Release, including, without limitation,
investigation and cleanup of such Release or threatened Release; and (c) the
storage, treatment, disposal, recycling or transportation of any Hazardous
Substance.

"EPIC" shall mean Exploracion y Produccion EPIC, S.A., an entidad de inversion
colectiva de capital de riesgo to be organized under the laws of the Republic
of Venezuela and sponsored by an Associated Entity of PDVSA for purposes of
giving Venezuelan citizens and other investors an opportunity to invest in the
Venezuelan hydrocarbon sector and related projects, and shall also mean another
sociedad anonima organized under the laws of the Republic of Venezuela by an
Associated Entity of PDVSA and designated in writing by PDVSA as acting on
behalf and in place of Exploracion y Produccion EPIC, S.A. until completion of
the latter's organization and the transfer to it of any Participation held by
such other sociedad anonima.

"Event of Force Majeure" shall have the meaning set forth in Clause 26.2.

"Exploration Activity" shall mean such activity as one or more of the
Contractors propose to the Affiliate and the Affiliate approves pursuant to
Clause 8.2, for the conduct, at the sole risk of such Contractors, of
exploration and/or appraisal activities in the Area outside the Field
Boundaries of the then-existing Fields, as amended from time to time in
accordance with this Agreement.

"Exploration Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Export Point" shall have the meaning set forth in Clause 15.3.

"Factor de Valorizacion" shall mean the payment to be made by the Contractors
pursuant to Clause 3.4.



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"Field" shall mean each of (i) the Initial Field and (ii) any
Hydrocarbon-bearing formation, or group of Hydrocarbon-bearing formations,
described as a Field by the Contractors in a Development Plan submitted to and
approved by the Affiliate pursuant to Clauses 8.4 and 8.5.

"Field Boundary" shall mean, (i) with respect to the Initial Field, the
boundaries of such Initial Field set forth in Annex B, as modified from time to
time in accordance with Clauses 8.8 or 8.9, and (ii) with respect to any other
Field, the boundary (or boundaries, in the case of a Field comprising more than
one formation) described as the Field Boundary in the related Development Plan
submitted in accordance with Clause 8.4, which shall include each area in which
such Field is located, and the upper and lower geological horizons of such
Field, and which may include an area, or an upper or lower geological horizon,
to which the Contractors can reasonably demonstrate such Field may extend, as
modified from time to time in accordance with Clauses 8.8 or 8.9.

"Final Well Report" shall mean, with respect to any exploration or appraisal
well, a report prepared in accordance with Clause 8.3.

"Free Gas Discovery" shall mean a discovery of Hydrocarbons outside the Field
Boundaries of existing Fields, that consist of Natural Gas and related
condensates that are primarily in the gas phase at reservoir conditions, where
the sale or other commercial disposal of the Natural Gas is likely to be
necessary in order to achieve commercial production of such Hydrocarbons.

"Hazardous Substance" shall mean any pollutant, contaminant, constituent,
chemical, mixture, raw material, intermediate product, finished product or
by-product, Hydrocarbon or any fraction thereof, asbestos or
asbestos-containing-material, polychlorinated biphenyls, or industrial, solid,
toxic, radioactive, infectious, disease-causing or hazardous substance,
material, waste or agent, including, without limitation, all substances,
materials or wastes which are identified or regulated under any Environmental
Law. 

"Hydrocarbons" shall mean Liquid Hydrocarbons and Natural Gas.

"Incremental Gas" shall have the meaning set forth in Clause 16.2.

"Incremental Production" shall mean, for any Quarter, all Production in excess
of Baseline Production for such Quarter, other than any Production of
Associated Gas.

"Initial Baseline Production" shall mean, a volume of Production of Liquid
Hydrocarbons in the first Quarter of the Operation Period, determined as
provided in Clause 11.8.

"Initial Field" shall mean the Hydrocarbon-bearing formation or group of
Hydrocarbon-bearing formations described as the "Initial Field" in Annex B
hereto.

"International Oil Industry Standards" shall mean such practices and procedures
employed generally in the petroleum industry throughout the world by prudent
and diligent operators under conditions and circumstances similar to those
experienced in connection with the relevant aspect or aspects of the Operating
Services.


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"Law or Decision" shall mean any applicable law, statute, ordinance, code,
rule, regulation, order, writ, injunction, decree, demand, judgment, ruling,
decision, determination, award, standard, permit, or variance of any Venezuelan
governmental authority, or any binding agreement with any Venezuelan
governmental authority.

"LIBOR" shall mean, as of any date of determination, the three-month London
Interbank Offered Rate, determined at 11:00 a.m., London time, on the first day
of the calendar quarter in which the date of determination occurs (or, if the
first day of such calendar quarter is not a London Banking Day, the immediately
preceding London Banking Day), as such rate appears on Telerate Page 3750, or
any successor page thereto. If Telerate Page 3750 or any successor page ceases
to publish the three-month London Interbank Offered Rate, the Parties shall
designate an alternative mechanism consistent with Eurodollar market practice
for determining such rate. For purposes of this definition, a "London Banking
Day" is a day on which dealings in deposits in U.S. dollars are transacted on
the London interbank market.

"Liquid Hydrocarbons" shall mean crude mineral oil, regardless of gravity, which
is produced at the wellhead in a liquid state at ambient conditions of
temperature and atmospheric pressure, or which is obtained from Natural Gas by
natural condensation.

"Maximum Economic Rate" shall mean, with respect to any Field, the maximum
rate of production at which such Field may be produced over the life of the
Field in order to obtain the maximum final economic recovery from the relevant
reserves, reflecting sound engineering and economic principles in accordance
with International Oil Industry Standards.

"Minimum Work Obligation" shall have the meaning set forth in Clause 4.3.

"Natural Gas" shall mean Wet gas, Dry gas, all other gaseous hydrocarbons and
all substances contained therein, which are produced from oil or gas wells,
excluding Liquid Hydrocarbons that condense naturally upstream of the Delivery
Point.

"Net Hydrocarbon Value" shall have the meaning set forth in the Accounting
Procedures.

"Operating Expenditures" shall have the meaning set forth in the Accounting
Procedures.

"Operating Services" shall have the meaning set forth in Clause 4.1.

"Operation Period" shall mean the 20-year period (or shorter period as may be
contemplated by the Development Plan for the relevant Field, as amended from
time to time) commencing on the Takeover Date with respect to the Initial Field
and the date of approval of the relevant Development Plan by the Affiliate with
respect to any other Field, as such period may be extended or reduced pursuant
to Clauses XIX or XX.

"Operator" shall mean UNION TEXAS VENEZUELA LIMITED, a Corporation organized
under the laws of the Commonwealth of the Bahamas, and any replacement or
additional Operator appointed pursuant to Clause X.

"Operator Guarantor" shall have the meaning set forth in Clause 10.1.



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"Other Contractors" shall mean all Contractors other than EPIC.

"Parties" shall mean the Affiliate, the Contractors, and, after their accession
to this Agreement, the Operator and EPIC.

"Participation" shall mean, with respect to any Field or Exploration Activity
and any Contractor, the percentage participation interest of such Contractor in
the rights and obligations of all the Contractors in relation to such Field, as
set forth initially in the relevant Development Plan, or Exploration Activity,
and as modified from time to time in accordance with Clause 3.3 or Clause XXVII.
The initial Participations of the Contractors in the Initial Field are set forth
in Annex F hereto, and the initial Participations of the Contractors in any
other Field shall be set forth in the relevant Development Plan.

"PDVSA" shall mean Petroleos de Venezuela, S.A., a sociedad anonima organized
under the laws of the Republic of Venezuela, and any successor in interest
thereto.

"Person" shall mean any individual, corporation, sociedad mercantil,
association, joint venture, partnership, trust, limited liability company,
joint-stock company, unincorporated organization or government, or any agency or
political subdivision thereof.

"Post-Takeover Date Environmental Claim and Cleanup Liability" shall mean any
Environmental Claim and Cleanup Liability other than the Pre-Takeover Date
Environmental Claim and Cleanup Liability, that is related to or results from
any activities or operations of the Contractors or Operator under this Agreement
(including the continued use after the Takeover Date of wells and other
facilities, installations and equipment existing in the Area and made available
to the Contractors as of the Takeover Date).

"Pre-Takeover Date Environmental Claim and Cleanup Liability" shall mean
Environmental Claim and Cleanup Liability to the extent arising from or relating
to acts, omissions, conditions or circumstances occurring or existing prior to
the Takeover Date; provided that, except as specifically provided in Clause
22.5, Pre-Takeover Date Environmental Claim and Cleanup Liability shall not
include any costs or expenses needed to cause the continuing use of any
facilities, installations, equipment or other assets, that are in use on or
prior to the Takeover Date and that are thereafter used by the Contractors in
connection with the Operating Services, to comply with applicable Environmental
Law governing continuing Releases or the ongoing storage, treatment, disposal,
recycling or transportation of any Hazardous Substance.

"Price Formula" shall mean the formula used to determine the value of any
Production, as set forth in Annex L hereto.

"Production" shall mean the Hydrocarbon production obtained from the
exploitation of the Fields.

"Quarter" shall have the meaning set forth in the Accounting Procedures.




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"Receipt Point" shall mean the point or points at which gas, electricity and
water are to be delivered by the Affiliate to the Contractors pursuant to Clause
11.2, as specified in Annex H hereto, or as may otherwise be agreed by the
Affiliation and the Contractors.

"Release" shall mean any spill, discharge, leak, emission, injection, escape,
dumping, leaching, dispersal, emanation, migration or release of any Hazardous
Substance into the environment, including, without limitation, the abandonment
or discard of barrels, containers, tanks or other receptacles containing or
previously containing any Hazardous Substance.


"Royalty" shall mean, with respect to any Production and any time period, the
deemed amount determined in the manner provided in the Accounting Procedures,
reflecting the exploitation tax payable in respect of such Production during
such time period.

"Service Fee" shall mean the payment made to the Contractors (i) in
reimbursement of advances made by the Contractors for the acquisition of goods
and services on behalf of the Affiliate and (ii) in compensation for the
Contractors' services hereunder, all as described in Clause XVII and the
Accounting Procedures.

"Standard Cubic Foot" or "standard cubic foot" or "SCF" shall mean the quantity
of gas occupying a United States cubic foot at 60 degrees Fahrenheit and one
atmosphere of pressure.

"Takeover Date" shall mean the date on which the Operator assumes control and
responsibility for all activities within the Area that are subject to this
Agreement, determined as provided in Clause 11.8.

"Transfer" shall mean any sale, assignment, delegation, transfer or other
disposition by any means (including by way of pledge or other similar
encumbrance) of all or any part of a Party's rights or obligations under this
Agreement; provided that "Transfer" shall not include a pledge of a Contractor's
rights to receive the Service Fee or other payments hereunder that (i) is made
as part of a bona fide financing transaction to enable a Contractor to perform
the Operating Services hereunder and (ii) does not purport to delegate to the
pledgee or any other Person any of the Contractor's other rights or obligations
hereunder, or give such pledgee or other Person any right to attach, seize or
execute on the Contractor's Participation or to transfer or convey all or any
part of such Participation to any third party.

"Transportation and Handling" shall mean the physical transportation of
Hydrocarbons from the wellhead or other point of extraction to the relevant
Delivery Point, including processing, separation, storage and other activities
reasonably necessary for such physical transportation and the transfer of such
Hydrocarbons to the Affiliate at such Delivery Point.

"Uniform Reporting System" shall have the meaning set forth in the Accounting
Procedures.

"Wet" shall mean, as applied to any Natural Gas, such Natural Gas before the
extraction of propane, butane and similar liquids that may be removed by
extraction.

"Bs" or "Bolivars" shall mean the lawful currency of the Republic of Venezuela.




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    "$" or "Dollars" shall mean the lawful currency of the United States of
    America.


                                       II


                                     OBJECT

2.1 This Agreement has as its object the rehabilitation and reactivation of
    certain Hydrocarbon reservoirs within the Area, the ongoing development and
    exploitation of such Hydrocarbon reservoirs, including the handling of any
    Production from such reservoirs, the Transportation and Handling of such
    Production to the relevant Delivery Points, the Delivery of such Production
    to the Affiliate at the Delivery Points, Exploration Activities and the
    other activities included in the Operating Services, in each case subject
    to the terms and conditions set forth herein.

2.2 The Parties recognize that the development, exploitation, and
    Transportation and Handling of, and the exploration for, Hydrocarbons
    constitute reserved activities within the meaning of the Organic Law
    Reserving to the State the Industry and Commerce of Hydrocarbons (LOREICH),
    and that accordingly the Contractors shall conduct the Operating Services
    hereunder not for their own account, but only for the account of the
    Affiliate, subject to the terms and conditions set forth herein.
    Hydrocarbons produced within the Area in accordance with this Agreement
    shall constitute the exclusive property of the Affiliate, and the economic
    rights of the Contractors under this Agreement shall be limited to the
    right to receive in cash the Service Fees payable hereunder from time to
    time (plus the direct reimbursement of other amounts in certain specified
    circumstances).

                                      III

            EFFECTIVENESS; GUARANTEES; EPIC; FACTOR DE VALORIZACION

3.1 This Agreement, and all obligations of the Parties hereto, shall come into
    effect on the Effective Date.

3.2 Concurrently with the execution of this Agreement, UNION TEXAS PETROLEUM
    HOLDINGS, INC. has provided to the Affiliate a guarantee of the respective
    obligations hereunder of such Contractor as is its Associated Entity, in
    the form set forth in Annex D hereto.

3.3 (a) The Affiliate shall promptly notify EPIC of the approval of a
    Development Plan for the Initial Field pursuant to Clause VI, at the same
    time that it notifies the Other Contractors. At any time following the
    Effective Date until the date which is 60 calendar days following the date
    on which the Affiliate gives EPIC such notice, EPIC may elect to become a
    Party to this Agreement by delivering an executed counterpart of this
    Agreement to the Affiliate.




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At the same time, EPIC shall give notice of such election to the Other
Contractors and to the Operator, if there is an Operator at such time.  Upon
delivery of an executed counterpart of this Agreement to the Affiliate (and
regardless of whether the Other Contractors and the Operator have yet received
notice),

(i)       EPIC shall immediately become a Contractor under this Agreement on the
          terms, and subject to the conditions, set forth herein and in Annex K,
          without any further action by any other Party;

(ii)      EPIC shall have the same rights and obligations under this Agreement
          as the Other Contractors, except that (1) EPIC shall have no liability
          to pay, or to reimburse any Other Contractor for payment of, the
          Factor de Valorizacion provided in Clause 3, 4, and (2) EPIC shall
          not be required to provide the Affiliate with a letter of credit or
          guarantee pursuant to Clause 4.4;

(iii)     EPIC will have a Participation of 10% in the Initial Field and in
          other rights under this Agreement, subject to modification or Transfer
          as provided herein; and

(iv)      in consideration of the assumption by EPIC of its obligations under
          this Agreement and Annex K, the respective Participations of each of
          the Other Contractors will be automatically reduced by 10% without
          any further action or formality of any kind; provided that the Other
          Contractors may, by notice to the Affiliate and EPIC given within 30
          days of EPIC's becoming a Party hereto, specify a different allocation
          in the reduction of their respective Participations and provided
          further that the Operator or its Associated Entity must in any event
          maintain a Participation of at least 27%.  No approval of such
          reductions by the Affiliate pursuant to Clause XXVII will be required.
          If requested, each Other Contractor will execute any and all documents
          and do any and all acts that may be necessary, useful or required by
          applicable law or regulation in order to complete such reduction.

(b) Beginning promptly after the Effective Date and continuing throughout the
entire option period provided in Clause 3.3(a), the Operator and the Other
Contractors shall immediately provide EPIC with copies (or, in the case of oral
communications, descriptions) of all documents, communications, reports,
notices and other information that are provided to, or received from, the
Affiliate, any Other Contractor or any ministry or agency of the Venezuelan
government in connection with the Agreement, including without limitation the
following:

          (i)  preliminary and final versions of any Development Plan, Annual
          Work Program and Budget, AFE, Final Well Report or Exploration
          Activity, and of any significant amendments thereto; and

          (ii) any significant proposal, commentary, disagreement, dispute,
          approval, response or other communications with regard to any of such
          documents.
 

                                       11
   15

                                                                   BOQUERON AREA

In addition, the Operator and Other Contractors shall afford EPIC reasonable
access to such additional information and documents as EPIC may reasonably
request with respect to the Agreement and the provision of the Operating
Services; provided that neither the Operator nor any Other Contractor will be
required to divulge proprietary technology to EPIC.

Such information provided to EPIC shall be subject to the confidentiality
provisions of Clause XXV. Prior to receiving any such information, EPIC shall
confirm in writing to each of the Other Contractors and to the Affiliate its
agreement to be bound by the provisions of Clause XXV (even if it does not
ultimately exercise the option to become a Party hereto) and to return all such
information in the event that it does not exercise such option.

(c)  (i) Within 60 calendar days of an election by EPIC to become a Party to 
     this Agreement pursuant to Clause 3.3(a), the Operator and Other
     Contractor(s) shall notify EPIC whether they intend to invite EPIC to
     become a party to any joint operating or similar agreement already
     existing between some or all of them or to enter into a new joint
     operating or similar agreement with some or all of them, in each case
     relating to rights and obligations of the Operator and/or Contractors, or
     the provision of Operating Services, under the Agreement. The Operator and
     Other Contractors shall have no obligation to invite EPIC to become a
     party to any such joint operating or similar agreement, and EPIC shall
     have no obligation to become a party if so invited. A decision during such
     60-day period not to invite EPIC to become a party to an existing
     agreement or to enter into a new agreement shall not preclude either such
     an invitation to EPIC in the future or the negotiation of other types of
     arrangements with EPIC.


     (ii) Unless EPIC and the Other Contractors otherwise agree in writing, the
     provisions of Annex K shall govern EPIC's relations with the Operator and
     the Other Contractor(s) with respect to the matters covered therein and
     shall be a binding and enforceable agreement between them and EPIC.

     (iii) Unless EPIC and the Other Contractors otherwise agree in writing,
     EPIC shall have the rights and obligations provided in Annex K as of the
     date that EPIC becomes a Party to this Agreement pursuant to Clause 3.3(a),
     including without limitation the obligation to reimburse to the Other
     Contractors its pro rata share of the expenses of the Operator and the
     Other Contractors (other than the Factor de Valorizacion) in respect of the
     Operating Services, between the Effective Date and the date on which EPIC
     becomes a party.

(d) The rights and obligations of EPIC under this Clause 3.3 will be legally
enforceable by EPIC and the Other Contractors as of the Effective Date,
regardless of whether EPIC ultimately elects to become a Party to the Agreement
under Clause 3.3(a). If EPIC does not become a Party to the Agreement, all such
rights and obligations will terminate at the


                                       12
   16
                                                                   BOQUERON AREA

    end of the option period provided in Clause 3.3(a), except for EPIC's
    obligations under the confidentiality provisions of Clause XXV which will
    continue as provided therein.

3.4 No later than five (5) Business Days after the Effective Date, the Other
    Contractors shall pay to the Affiliate in U.S. dollars the Factor de
    Valorizacion in the amount of $174,783,787, by wire transfer of immediately
    available funds to an account specified in writing by the Affiliate. The
    Factor de Valorizacion shall not be considered a Chargeable Expenditure of
    the Contractors for purposes of determining the Service Fee for any Quarter.

3.5 Each Contractor and Operator hereby represents and warrants that all of the
    technical, financial, legal, ownership and other information that it or its
    Associated Entity has provided to PDVSA in connection with qualification to
    participate in the bidding process that led to the award of this Agreement
    was and is true and correct in all material respects when submitted, as of
    the bidding and as of the date hereof, except as specifically disclosed in
    writing to PDVSA and the Affiliate prior to the bidding. Any material
    inaccuracy in such information will constitute a material breach of this
    Agreement under Clause 20.2, which will give the Affiliate the right to
    terminate this Agreement with respect to the Contractor concerned and any
    other Contractor that is aware or whose Associated Entity is aware of such
    material inaccuracy. The cure period provided in Clause 20.2 will not apply
    to such termination.


                                       IV

                  OPERATING SERVICES: MINIMUM WORK OBLIGATION

4.1 On the terms and subject to the conditions set forth in this Agreement, the
    Contractors undertake to provide the following services (the "Operating
    Services") for the Affiliate;

    (i)     the rehabilitation, reactivation and enhancement of the Initial
            Field, in accordance with the relevant Development Plan;

    (ii)    the uninterrupted delivery of the Baseline Production to the
            Affiliate;

    (iii)   Exploration Activities with respect to other parts of the Area in
            accordance with Clause VIII, and the development and exploitation 
            of any resulting Fields, in accordance with the relevant Development
            Plans;

    (iv)    the Transportation and Handling of Production from the Fields to
            the applicable Delivery Points, in accordance with the relevant
            Development Plans;

    (v)     the delivery of such Production to the Affiliate at such Delivery
            Points in accordance with Clause 15.4; and

    (vi)    any other service to be performed by the Contractors in the Area
            for the Affiliate as set forth in this Agreement.


                                       13
   17
                                                                   BOQUERON AREA


4.2  It is the understanding of the Parties that:

     (i)       all activities involved in the provision of the Operating
               Services shall be carried out by the Contractors for the account
               of the Affiliate;

     (ii)      all costs incurred in the provision of the Operating Services
               shall be funded directly by the Contractors, and not by the
               Affiliate;

     (iii)     such costs shall be recoverable by the Contractors only from and
               to the extent of the Service Fee, and shall not be recoverable if
               the Service Fee is insufficient to permit such recovery (except
               for the direct reimbursement of certain expenses in certain
               specified circumstances);

     (iv)      the Service Fee shall be the sole remuneration payable to the
               Contractors for the provision of the Operating Services, and no
               other payment or compensation of any kind will be due or payable
               to the Contractors, either during the term of this Agreement or
               following its termination, regardless of whether the Service Fee
               is adequate to cover their costs and expenses in providing the
               Operating Services (except for the direct reimbursement of
               certain expenses in certain specified circumstances); and

     (v)       all right, title and interest to any Production obtained by the
               Contractors shall belong exclusively to the Affiliate.

4.3  Within a period of 3 years beginning on the Takeover Date, the Contractors
     shall be obligated to expend in the provision of the Operating Services
     with respect to the Initial Field an amount of Chargeable Expenditures at
     least equal to $13,000,000 (the "Minimum Work Obligation"). Any
     modification to the Minimum Work Obligation requires the prior approval of
     the Affiliate, which the Affiliate may grant or deny in its discretion.
     
     If the Agreement terminates for any reason or the time period specified in
     the preceding paragraph ends, in either case without the completion of the
     Minimum Work Obligation in full, then the Contractors shall pay the
     Affiliate the unexpended balance of the Minimum Work Obligation in Dollars
     in cash within 30 days of such termination or the end of such period, as
     compensation for such non-completion.

4.4  Concurrently with the execution of this Agreement, the Contractors, at
     their own cost and expense, have provided the Affiliate with one or more
     irrevocable stand-by letters of credit from financial institutions
     acceptable to the Affiliate in the form of Annex O hereto, or guarantees
     acceptable to the Affiliate in the form of Annex M or M-2 hereto, in an
     aggregate amount equivalent to   *  . In the event that any such
     letter of credit would expire prior to the end of the period specified for
     the completion of the Minimum Work Obligation in the first sentence of
     Clause 4.3, the Contractor(s) that provided such letter of credit shall
     replace it with another irrevocable stand-by letter of credit in the form
     of Annex O that provides for a drawing period ending on the last day of
     such period. If the Affiliate draws any letter of credit delivered pursuant
     to this Clause because it would otherwise expire prior to completion of the
     Minimum Work Obligation, the Affiliate shall: (a) return all drawn funds to


* Confidential portion has been omitted pursuant to a request for confidential 
  treatment and filed separately with the Commission.

                                       14
   18
                                                                   BOQUERON AREA


     the Contractor(s) concerned upon receipt of a replacement letter of credit
     in like amount meeting the requirements of the first sentence of this
     Clause and paragraph (iii)(b) of Exhibit 3 of Annex O; (b) return such
     funds to the Contractor(s) concerned as and when the Contractor(s) would
     be entitled to the reduction of a letter of credit as provided under this
     Clause; or (c) be entitled to retain any balance of such funds as provided
     in the last sentence of this Clause. Under no circumstances shall the
     Affiliate owe any interest with respect to any such funds. The value of
     any such letter of credit or guarantee shall be reduced at the request of
     the Contractors every 3 months, commencing 3 months after the Takeover
     Date, by the amount of funds spent by the Contractors on the Operating
     Services in respect of the Initial Field prior to the date of reduction
     (or a pro rata share of such amount, based on the Participation in the
     Initial Field of the Contractor that provided the letter of credit or
     guarantee, if more than one letter of credit or guarantee is provided by
     the Contractors), upon certification by the Affiliate that such amount has
     been properly charged in accordance with the Accounting Procedures. Only
     funds expended on activities relating to the Initial Field (as allocated
     in accordance with Clause 17.3 and the Accounting Procedures) shall count
     toward such reduction. In addition, the value of any such letter of credit
     or guarantee shall be reduced by 10% at the request of the Contractors if
     EPIC becomes a Party to this Agreement pursuant to Clause 3.3. Any such
     letter of credit, guarantee or financial undertaking shall be terminated
     upon certification by the Affiliate that the required amounts have been
     expended. Absent disagreement regarding expenditures, the Affiliate agrees
     to make such certification within thirty (30) days following the
     presentation by the Contractors of documentary evidence reflecting or
     showing such expenses. Failure by the Contractors to fulfill the Minimum
     Work Obligation as specified in Clause 4.3 shall entitle the Affiliate to
     demand payment of the amount of such guarantees and letters of credit, as
     compensation for such failure.

                                        
                                       V
                                        
                        AFFILIATE APPROVAL REQUIREMENTS


5.1  The activities to be conducted by the Contractors as part of the Operating
     Services hereunder shall be undertaken for the account of the Affiliate.
     Accordingly, in order to ensure that the Operating Services are consistent
     with the objectives of this Agreement, the rights of the Contractors to
     perform the Operating Services shall be subject to the approval by the
     Affiliate of the matters specified in Clause 5.2.

5.2  The following matters shall be required to be presented to the Affiliate
     for approval:

     (i)  the Development Plan for the Initial Field, as provided in Clause
          6.1, and any amendment thereto, as provided in Clause 9.1;

     (ii) each Annual Work Program and Budget, as provided in Clause 7.1, and
          any amendment thereto required to be approved pursuant to Clause 7.7;




                                       15
   19
                                                                   BOQUERON AREA




     (iii)     each Exploration Activity, as provided in Clause 8.1, and any
               further Exploration Activity, as provided in Clause 8.3;

     (iv)      the Development Plan for each additional Field, as provided in
               Clause 8.4, and any amendment thereto, as provided in Clause 9.1;

     (v)       any AFE exceeding the thresholds set forth in Clause 7.6(ii), and
               any amendment thereto required to be approved pursuant to Clause
               7.7;

     (vi)      any proposed modification of the Minimum Work Obligation, as
               provided in Clause 4.3;

     (vii)     any proposed extension of an Operation Period, as provided in
               Clause 19.3;

     (viii)    any proposed agreement with respect to a Field extending beyond
               the Area, as provided in Clause XIII;

     (ix)      any proposal for the designation of a replacement, additional or
               interim Operator, as provided in Clause X;

     (x)       the execution, modification or termination of any contract or
               other arrangement for the purchase, sale, leasing or other
               acquisition, disposition or administration of goods or services
               in connection with the Operating Services, from the Operator
               (acting as a supplier of goods or services and not in its
               capacity as Operator), any Contractor or any of their respective
               Associated Entities, involving aggregate expenditures in excess
               of  *  , or its equivalent in any other currency;

     (xi)      the proposal for the designation of the external independent
               auditors to review the Contractors statements and invoices in
               accordance with Clause 18.3;

     (xii)     any proposal by the Contractors to designate an additional
               Delivery Point or to modify the Delivery Point Capacity of any
               Delivery Point, as provided in Clause 15.3;

     (xiii)    any proposal by the Contractors to calculate the Service Fee for
               two or more Fields on a combined basis, or otherwise to include
               costs not allocable to a Field in accordance with the Accounting
               Procedures to be included in the calculation of the Service Fee
               for such Field, as provided in Clause 17.3;

     (xiv)     any proposed Transfer by or change in control of any of the
               Contractors, as provided in Clause XXVII;

     (xv)      any proposed modification of an existing Field Boundary as
               provided in Clauses 8.8 or 8.9;

     (xvi)     any proposed disposition or use of certain assets as provided in
               Clauses 12.3 or 12.4; and



* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.



                                       16
   20
                                                                   BOQUERON AREA


     (xvii) any other matter specifically requiring the approval of the
     Affiliate in accordance with this Agreement.

5.3  With respect to any matter requiring the approval of the Affiliate pursuant
     to this Agreement, such approval may not be unreasonably withheld, except
     where it is specified that the decision is within the Affiliate's
     discretion. Except as otherwise provided herein, the Affiliate must make a
     decision with respect to any matter submitted for its approval within 60
     days following submission, except an Annual Work Program and Budget for
     which the Affiliate may take 90 days (30 days in the case of the first
     Annual Work Program and Budget submitted after approval of the Development
     Plan for the Initial Field). In the event the Affiliate does not make a
     decision regarding a matter submitted for its approval within the time
     specified, the relevant matter will be deemed approved. If the Affiliate
     denies its approval as to any matter, it will provide an explanation to the
     Contractors stating the reasons for such denial. In the event the
     Affiliate's approval is denied, the Contractors may, to the extent
     permitted by the relevant provisions of this Agreement, revise their
     proposal to take into account the Affiliate's comments and submit their
     revised proposal for approval, which will be subject to the same standards
     and time periods (counted from the date of resubmission) as are applicable
     to the initial submission.

5.4  So long as the Contractors conduct their activities in accordance with this
     Agreement, obtain the approval of the Affiliate with respect to the matters
     set forth in Clause 5.2 and comply with the terms of the relevant
     Development Plans, Annual Work Programs and Budgets and other decisions
     made by the Affiliate pursuant to Clause 5.2, the Contractors shall be
     authorized to conduct the Operating Services in the manner they deem to be
     most appropriate.


                                       VI

                                DEVELOPMENT PLAN

6.1  No later than 6 months following the Effective Date, the Contractors must
     submit to the Affiliate for approval a proposed Development Plan
     contemplating the rehabilitation, reactivation and/or enhancement of the
     Initial Field. No physical operations within the Area may be conducted by
     the Contractors pursuant to this Agreement prior to the approval of the
     Development Plan, except as provided in Clause 11.8 or as otherwise
     approved by the Affiliate. The Affiliate will provide reasonable
     cooperation to the Contractors in the performance of those activities that
     are necessary or convenient to the Contractors in connection with the
     preparation of the Development Plan for submission to the Affiliate.

6.2  The Development Plan proposed for the Initial Field must be prepared in
     accordance with the guidelines set forth in Annex E hereto (to the extent
     applicable to the Initial Field) and in any event must include:


                                       17
   21

                                                                   BOQUERON AREA

         (i)      the proposed rehabilitation, reactivation or enhancement
                  scheme for the Initial Field, including a general description
                  of the expected activities for the relevant Operation Period
                  and a discussion of alternative schemes that were considered;

         (ii)     an estimate of proved, probable and possible reserves in the
                  Initial Field (in each case, determined on a life-of-field
                  basis, without regard to the duration of the Operation
                  Period);

         (iii)    an estimate of the production profile of the Hydrocarbons that
                  the Contractors expect to deliver to the Affiliate in each
                  year during the Operation Period for the proved and proved
                  plus probable reserves cases, and an explanation of how the
                  production profile in the proved reserve case achieves the
                  Maximum Economic Rate of Production (unless Production is
                  constrained by Delivery Point Capacity);

         (iv)     projected Capital and Operating expenditures for the Operation
                  Period for the proved and proved plus probable reserves cases
                  (in constant dollars and without adjustment for expected
                  inflation), prepared in accordance with the Uniform Reporting
                  System;

         (v)      an estimate of the Service Fees that the Contractors expect to
                  be payable by the Affiliate during each year of the Operation
                  Period for each reserves case;

         (vi)     the designation of any additional Delivery Point(s) that the
                  Contractors propose to use in accordance with Clause 15.3 and
                  a full description of the Transportation and Handling
                  infrastructure that will be used to transport Hydrocarbons to
                  such Delivery Point(s);

         (vii)    an environmental contingency plan in accordance with Clause
                  22.1;

         (viii)   a plan for the periodic inspection of all inactive wells in
                  the Initial Field at least twice per year and, unless
                  otherwise agreed by the Affiliate in its discretion, a plan
                  for the periodic surveillance of subsidence in and around the
                  Area that may be affected by Production; and

         (ix)     a plan for the transfer of Operations in accordance with
                  Clause 11.8.

6.3      The Affiliate will approve a proposed Development Plan for the Initial
         Field if:

         (i)      it complies with the provisions of Clause 6.2, contemplates
                  a budget that meets the Minimum Work Obligation, and provides
                  for the delivery at each Delivery Point only of Production
                  that is within the Delivery Point Capacity of such Delivery
                  Point and that satisfies the quality standards for such
                  Delivery Point as specified in Annex H or otherwise
                  determined in accordance with Clause 15.3;

         (ii)     provides for the uninterrupted delivery of the Baseline
                  Production at the Delivery Point(s);


                                       18
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                                                                   BOQUERON AREA

     (iii)     the production profile in the proved reserve case calls for
               Production at the lesser of (x) the Maximum Economic Rate for the
               Initial Field, and (y) the aggregate of the Delivery Point
               Capacities of the different Delivery Points to which the
               Development Plan contemplates delivery of Hydrocarbons; and

     (iv)      such proposed Development Plan is consistent with International 
               Oil Industry Standards.

     The Affiliate may approve a Development Plan that does not meet one or more
     of the standards set forth above in its discretion.

6.4  If the Affiliate rejects a proposed Development Plan for failure to comply
     with the standards set forth in either Clause 6.3(iii) or (iv), the
     Operator may, at any time up to 30 days after the date of rejection,
     request that the question of whether the Development Plan complies with
     such provisions be referred to an independent expert in accordance with
     Clause 23.3. The decision of the independent expert as to the proposed
     Development Plan will be final and binding.

6.5  If a proposed Development Plan is rejected by the Affiliate (and, if there
     is a review by an independent expert, such independent expert confirms such
     rejection), then the Contractors may, at their option:

     (i)       submit a revised Development Plan; or

     (ii)      relinquish their rights under this Agreement, in which case this
               Agreement will terminate.

                                      VII

                     ANNUAL WORK PROGRAMS AND BUDGETS; AFEs

7.1  No later than 30 days after the approval of a Development Plan for a
     Field, the Contractors shall submit for approval to the Affiliate a
     proposed Annual Work Program and Budget for the remainder of the then
     current calendar year. In each year thereafter, the Contractors shall
     submit for approval to the Affiliate a proposed Annual Work Program and
     Budget for the immediately following calendar year, no later than the date
     notified by the Affiliate to the Contractors at least 90 days in advance of
     the due date for the following year's proposed Annual Work Program and
     Budget. Each Annual Work Program and Budget shall contain, at a minimum,
     the following information with respect to each Field in the Area:

     (i)       a detailed description of the work that the Contractors expect
               to undertake in the implementation of the Development Plan during
               such year;

     (ii)      the volume of Hydrocarbons that the Contractors expect to
               deliver to the Affiliate during such year, broken down on a
               monthly basis;



                                       19
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                                                                   BOQUERON AREA

     (iii)     a budget for such year meeting the requirements of the Uniform
               Reporting System; and

     (iv)      an estimate of the total amount of Service Fees that the
               Contractors expect to be payable by the Affiliate in such year in
               respect of such Field, as well as a breakdown of such fees in
               respect of each Quarter in such year.

7.2  Together with the proposed Annual Work Program and Budget, the Contractors
     will provide to the Affiliate an update to the Development Plan, reflecting
     modifications arising from the Annual Work Program and Budget for such year
     and for prior years, taken as a whole, as well as a reserves statement
     prepared in accordance with the Uniform Reporting System. Such update will
     not constitute an amendment to the Development Plan; a Development Plan may
     only be amended in accordance with Clause IX.

7.3  The Affiliate will approve any proposed Annual Work Program and Budget
     submitted in accordance with Clause 7.1 if:

     (i)       the Production projected for the relevant year is no more than
               20% below the Production for the relevant year projected in the
               Development Plan for the proved reserves case;

     (ii)      the Operating Expenditures per barrel of Liquid Hydrocarbons
               reflected in such Annual Work Program and Budget are not more
               than 20% above the Operating Expenditures per barrel of Liquid
               Hydrocarbons projected for the relevant year in the Development
               Plan for the proved reserves case (as adjusted for inflation in
               accordance with the Accounting Procedures);

     (iii)     the Capital Expenditures reflected in such Annual Work Program
               and Budget are not more than 20% above the Capital Expenditures
               projected for the relevant year in the Development Plan for the
               proved reserve case (as adjusted for inflation in accordance with
               the Accounting Procedures); and

     (iv)      the proposed work plan is consistent with the International Oil
               Industry Standards.

     The Affiliate may approve a proposed Annual Work Program and Budget that
     does not meet these standards at its discretion.

7.4  If the Affiliate rejects a proposed Annual Work Program and Budget for
     failure of the work plan to comply with the standards set forth in Clause
     7.3(iv), the Operator may, at any time up to 30 days after the date of
     rejection, request that the question of whether such work plan complies
     with such standards be referred to an independent expert in accordance with
     Clause 23.3. The decision of the independent expert will be final and
     binding with respect to such question.

7.5  In the event the Affiliate does not approve all or any part of the budget
     portion of any proposed Annual Work Program and Budget:



                                       20
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                                                                   BOQUERON AREA


         (i)      the Contractors may carry out those activities as to which a
                  work plan and budget has been approved pending approval of
                  the remainder;

         (ii)     the Contractors may continue to fulfill any commitment
                  entered into in accordance with an AFE that was previously
                  approved by the Affiliate, up to the maximum amount
                  authorized in such AFE;

         (iii)    the Contractors may continue operations contemplated in the
                  Development Plan under an interim operating budget that does
                  not exceed the operating budget for the prior year by more
                  than 5% overall or 10% as to any line item (in each case as
                  adjusted for inflation in accordance with the Accounting
                  Procedures); and

         (iv)     the Contractors may undertake activities necessary in an
                  emergency situation for the preservation of life, health,
                  safety, the environment or the integrity of the Field (in
                  which case the Contractors shall as promptly as practicable
                  report the relevant activities to the Affiliate and prepare a
                  revised budget reflecting the emergency expenditures in
                  accordance with the Accounting Procedures).

7.6      (i)      Prior to incurring any commitment or expenditure that is
                  estimated to be in excess of   *  , the Contractors shall
                  send to the Affiliate an AFE, containing their best estimate
                  of the total funds required to carry out the relevant work,
                  the amount of direct expense estimated to be incurred by the
                  Contractors, the estimated timing of expenditures, and any
                  other necessary supportive information. Notwithstanding the
                  foregoing, the Contractors shall not be obliged to furnish an
                  AFE to the Affiliate with respect to any general and
                  administrative costs that are listed as separate line items
                  in an approved Annual Work Program and Budget. All such AFEs,
                  except as provided in Clause 7.6(ii), shall be for
                  informational purposes only and, provided the work and funds
                  to be expended therefor are authorized in the relevant Annual
                  Work Program and Budget, the Contractors shall not be
                  required to obtain approval for such AFEs.

         
         (ii)     For any AFE in excess of   *  , prior to expending any
                  funds or incurring any commitments for work, the Contractors
                  shall obtain the approval of the Affiliate. The Affiliate
                  will approve an AFE if the total costs for the relevant
                  commitment or expenditure are no more than 10% above the
                  amount set forth in the relevant Annual Work Plan and Budget,
                  as adjusted for inflation as provided in the Accounting
                  Procedures. The Affiliate may approve an AFE that does not
                  meet this standard in its discretion.

         (iii)    The requirements of Clause 7.6(i), but not Clause 7.6(ii),
                  shall apply to Exploration Expenditures in connection with
                  approved Exploration Activities under Clause VIII.

7.7      (a) The Contractors shall be entitled to incur without further
         approval of the Affiliate an overexpenditure for any line item in the
         budget portion of an approved Annual Work Program and Budget up to ten
         percent (10%) of the authorized amount for such line item, so long as
         the cumulative total of all overexpenditures for a calendar year does
         not exceed five percent (5%)of the total amount set forth in such
         Annual Work Program and Budget. Approval of a modified budget
         reflecting proposed overexpenditures above either of these thresholds
         shall be



* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.

                                       21
   25

                                                                   BOQUERON AREA

         granted if the standards set forth in Clauses 7.3(ii) and 7.3(iii) are
         met, and otherwise may be granted or denied by the Affiliate in its
         discretion. In addition, at such time as the Contractors forecast that
         the cumulative expenditures authorized in any AFE will be exceeded by
         more than 10%, the Contractors shall furnish a supplemental AFE for
         the estimated overexpenditures to the Affiliate; in the case of an AFE
         requiring Affiliate approval under Clause 7.6(ii), such supplemental
         AFE shall be subject to approval which shall be granted or denied
         in accordance with the same standards as were applicable to the
         original AFE.

         (b) In addition, the Contractors may undertake activities necessary in
         an emergency situation for the preservation of life, health, safety,
         the environment or the integrity of a Field (in which case the
         Contractors shall as promptly as practicable report the relevant
         activities to the Affiliate and prepare a revised budget reflecting
         the emergency expenditures in accordance with the Accounting
         Procedures).


                                      VIII


                      ACTIVITIES OUTSIDE FIELD BOUNDARIES


8.1      Following the approval of the Development Plan for the Initial Field,
         the Contractors may from time to time propose to the Affiliate for
         approval Exploration Activities they wish to conduct in any part of
         the Area that is not within the Field Boundaries of existing Fields.
         No such Exploration Activities may be commenced by the Contractors
         outside such Field Boundaries before approval by the Affiliate in
         accordance with this Clause.

8.2      Any Exploration Activity submitted pursuant to Clause 8.1 will be
         approved by the Affiliate if it is consistent with International Oil
         Industry Standards. If the Affiliate rejects a proposed Exploration
         Activity, the Contractors may, at any time up to 30 days after the
         date of rejection, request that the question of whether the proposed
         Exploration Activity complies with such standard be referred to an
         independent expert in accordance with Clause 23.3. The decision of the
         independent expert will be final and binding.

8.3      (a) No later than sixty (60) days after the completion of an
         Exploration Activity consisting of the drilling and testing of an
         exploration, appraisal or delineation well in the Area, the
         Contractors shall submit to the Affiliate a Final Well Report. The
         Final Well Report shall set forth in detail such information as the
         Contractors have been able to obtain regarding the nature of any
         Hydrocarbon-bearing structures or formations penetrated during the
         drilling of such well and such other information as may be required by
         applicable Venezuelan Laws and Decisions. Such Final Well Report will
         also set forth a recommendation for any further Exploration
         Activities, drilling or otherwise, that the Contractors consider the
         results warrant. If the Contractors propose to conduct any such
         further Exploration Activities, they shall so indicate in the Final
         Well Report or in a request for approval of further Exploration
         Activities. Unless the Affiliate notifies the Operator within 30 days
         of receipt of the Final Well Report or such request that it is denying
         approval of such further Exploration Activities, the Affiliate will be
         deemed to have approved such further Exploration Activities. Approval
         of any further


                                       22
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                                                                   BOQUERON AREA



     Exploration Activities (whether resulting from a Final Well Report or
     otherwise) shall be granted or denied, and shall be subject to independent
     expert review, on the same basis as the original Exploration Activities.

     (b) In the event that the Contractors wish to conduct a well test, they
     shall submit to the Affiliate for approval a plan for such well test,
     indicating the proposed duration of the test, the expected Production of
     the well, the proposed Delivery Point for such Production and all other
     relevant information relating to the test. Such test shall not exceed 90
     days and shall be conducted in accordance with all applicable Laws and
     Decisions. The Affiliate's approval or rejection of such plan shall be
     subject to independent expert review on the same basis as other Exploration
     Activities. Subject to the limitations and requirements set forth in Clause
     XV, the Affiliate will accept the test Production from such well, and the
     Contractors may at their option either (i) add such test Production to the
     Production from any single existing Field for purposes of calculating the
     Net Hydrocarbon Value for such Field for the Quarter or Quarters in which
     such test Production is delivered, or (ii) hold the total Net Hydrocarbon
     Value attributable to such test Production for subsequent inclusion
     (without inflation adjustment) in the Service Fee calculation for the first
     Quarter of the Operation Period for a new Field that includes the well that
     produced the test Production. No expenses associated with the test may be
     charged to such existing Field or any other existing Field; such expenses
     may only be recovered to the extent that they constitute Exploration
     Expenditures that are chargeable to a new Field in accordance with Article
     5.4.5 of the Accounting Procedures.

8.4  The Contractors shall be entitled at any time to submit a proposed
     Development Plan to the Affiliate contemplating the development of one or
     more Hydrocarbon-bearing structures, formations or deposits located outside
     the Field Boundaries of existing Fields. Any such proposed Development Plan
     must be prepared in accordance with the guidelines for the preparation of a
     Development Plan for the Initial Field set forth in Clause 6.2 and Annex E
     (except that relevant information must be provided with respect to the
     proposed Field; rather than the Initial Field). In addition, any such
     Development Plan must set forth the Field Boundary for the proposed Field
     and the Participation of each Contractor (with the Participation of the
     Operator or its Associated Entity meeting the requirements of Clause 10.3).
     The Contractors may not undertake any development or exploitation
     activities with respect to the proposed Field until the relevant
     Development Plan is approved.

     If any part of such Hydrocarbon-bearing structures, formations or deposits
     that the Contractors propose to develop (or any part of any
     Hydrocarbon-bearing structure, formation or deposit that is Connected
     thereto) extends beyond the boundary of the Area, the Contractors shall
     comply with the provisions of Clause XIII before submitting a Development
     Plan, unless the Connection with such part of a Hydrocarbon-bearing
     structure, formation or deposit extending beyond the Area boundary results
     exclusively from the existence of an Accumulation.

8.5  In deciding whether to approve any Development Plan submitted in accordance
     with Clause 8.4, the Affiliate will observe the same standards for approval
     as are set forth in Clause 6.3 with respect to the Development Plan for the
     Initial Field, except that:


                                       23





   27
                                                                  BOQUERON AREA

     (i)  the Affiliate will disregard whether the budget contained in such
          Development Plan would meet the Minimum Work Obligation and whether
          the Development Plan provides for delivery of the Baseline Production;
          and

     (ii) the Affiliate will be obliged to approve any proposed Development Plan
          only if the proposed Field Boundary (A) is limited to the
          Hydrocarbon-bearing formations, structures or deposits that the
          Contractors propose to develop, (B) includes all Connected
          Hydrocarbon-bearing structures, formations or deposits (other than
          any part of a Hydrocarbon-bearing structure, formation or deposit that
          extends beyond the boundary of the Area if the Connection to such part
          results exclusively from the existence of an Accumulation), and (C) is
          entirely within the Area.

     The Affiliate may approve a Development Plan that does not meet one or more
     of the standards set forth above in its discretion.

8.6  If the Affiliate rejects a proposed Development Plan submitted pursuant to
     Clause 8.5, the Operator may request independent expert review on the same
     basis as provided for the Development Plan for the Initial Field in Clause
     6.4. In addition, the Operator may request independent expert review, on
     the same basis and subject to the same timing requirements, if the
     Development Plan is rejected for failure to designate the Field Boundary in
     accordance with the standards set forth in Clause 8.5(ii).

8.7  In the event that a Development Plan submitted pursuant to Clause 8.4 is
     approved by the Affiliate, the relevant Hydrocarbon-bearing structures,
     formations or deposits shall be considered a Field, which shall be subject
     to the same Annual Work Program and Budget approval process as is provided
     in Clause VII for the Initial Field.

8.8  In the event that any Exploration Activity provides evidence that a
     Hydrocarbon-bearing structure, formation or deposit outside the Field
     Boundaries of the existing Fields in Connected to one or more of such
     Fields, the Contractors shall submit an amendment to the existing
     Development Plan for the relevant Field or Fields in accordance with Clause
     9.1, including a description of a modified Field Boundary that takes into
     account the Connected structure(s), formation(s) or deposit(s). The
     Affiliate shall approve such amendment if it meets the standards set forth
     in Clause 8.5(ii) and Clause 9.3.

     If any part of such Hydrocarbon-bearing structure, formation or deposit (or
     any part of any Hydrocarbon-bearing structure, formation or deposit that is
     Connected thereto) extends beyond the boundary of the Area, the Contractors
     shall comply with the provisions of Clause XIII before submitting an
     amendment to the Development Plan, unless the Connection with such part of
     a Hydrocarbon-bearing structure, formation or deposit extending beyond the
     Area boundary results exclusively from the existence of an Accumulation.

8.9  The Contractors may at any time propose to the Affiliate the combination
     into a single Field of two or more existing Fields that are not Connected
     or of an existing Field and a Hydrocarbon-bearing formation outside the
     Field Boundary of such existing Field that are not Connected. The
     Affiliate may approve or reject such proposal in its discretion.


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                                                                   BOQUERON AREA

                                       IX

                        AMENDMENTS TO DEVELOPMENT PLANS

9.1  The Contractors must submit an amendment to a Development Plan to the
     Affiliate for approval if it is expected that:

     (i)       the next Annual Work Program and Budget will contemplate 
               Production more than 20% below the level set forth for the
               relevant year in the Development Plan for the proved reserve
               case;

     (ii)      the next Annual Work Program and Budget will contemplate Capital
               Expenditures more than 20% above the Capital Expenditures
               projected for the relevant year in the Development Plan for the
               proved reserve case (as adjusted for inflation in accordance with
               the Accounting Procedures);

     (iii)     the next Annual Work Program and Budget will contemplate
               Operating Expenditures per barrel of Liquid Hydrocarbons more
               than 20% above the amount set forth in the Development Plan for
               the proved reserve case (as adjusted for inflation in accordance
               with the Accounting Procedures);

     (iv)      cumulative Production during the Operation Period will be more
               than 20% below the Production volume set forth in the Development
               Plan for the proved reserve case;

     (v)       average Operating Expenditures per barrel of Liquid Hydrocarbons
               during the Operation Period will be more than 20% above the
               amount set forth in the Development Plan for the proved reserve
               case (as adjusted for inflation in accordance with the Accounting
               Procedures);

     (vi)      total Capital Expenditures during the Operation Period will be
               more than 20% above the amount set forth in the Development Plan
               for the proved reserve case (as adjusted for inflation in
               accordance with the Accounting Procedures);

     (vii)     conditions change such that (A) the Maximum Economic Rate
               determined in light of such new conditions varies by more than
               20% from the Maximum Economic Rate reflected in the Development
               Plan currently in effect, and (B) such new Maximum Economic Rate
               is less than aggregate Delivery Point Capacity; or

     (viii)    an approved Exploration Activity provides evidence that a
               Hydrocarbon-bearing structure, formation or deposit outside the
               Field Boundaries of the Field that is subject to such Development
               Plan is Connected to such Field as provided in Clause 8.8.




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                                                                   BOQUERON AREA

     The Contractors may at their option submit amendment to the Development
     Plan to the Affiliate for reasons other than those set forth above.

9.2  If at any time the Affiliate believes that the Contractors are required to
     submit an amendment to a Development Plan to the Affiliate, the Affiliate
     may notify the Contractors of such belief. The contractors shall submit an
     amendment to the Development Plan to the Affiliate, or notify the
     Affiliate that they believe no such amendment is required, within 60 days
     after the Contractors receive such notice from the Affiliate. If the
     contractors notify the Affiliate that they believe no such amendment is
     required, the Affiliate may at any time up to 30 days after it receives the
     notice from the Contractors request the appointment of an independent
     expert in accordance with Clause 23.3 to determine whether an amendment is
     required. The decision of the independent expert will be final and binding.

9.3  In the case of any amended Development Plan presented for approval, the
     Affiliate will approve such an amended Development Plan if it meets the
     standards for approval of an original Development Plan (except the standard
     relating to the Minimum Work Obligation, to the extent that the Minimum
     Work Obligation has previously been satisfied, and the standard relating
     to delivery of the Baseline Production for any Field other than the
     Initial Field). In addition, any amendment required by Clause 8.8 must
     meet the standards of that Clause. If the Affiliate denies its approval of
     such an amendment, the denial shall be subject to independent expert
     review in accordance with the same standards and procedures set forth in
     Clause 6.4. Until the amendment to the Development Plan is approved, the
     Contractors must, to the extent possible, continue Operating Services in
     accordance with the Development Plan without giving effect to the
     amendment, except as otherwise agreed by the Affiliate.

9.4  If an amended Development Plan is rejected by the Affiliate (and, if there
     is review by an independent expert, such independent expert confirms such
     rejection), then the Contractors may, at their option;

     (i)   continue operations based on the Development Plan without giving
           effect to the amendment, unless amendment was required under Clause
           9.1;

     (ii)  submit a revised amendment to the Development Plan; or

     (iii) relinquish their rights under this Agreement with respect to the
           relevant Field in accordance with the requirements of Clause 20.4.

     If the Contractors do not submit a revised amendment to the Development
     Plan or notify the Affiliate of their intention to continue operations
     based on the original Development Plan within 90 days after the date of
     rejection by the Affiliate (or within 90 days of the date of the
     independent expert's determination), then the Contractors will be deemed
     to have relinquished their rights under this Agreement with respect to the
     relevant Field in accordance with the requirements of Clause 20.4.



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                                                                   BOQUERON AREA


                                       X

                                  THE OPERATOR

10.1 (a) The Contractors hereby designate the Operator to carry out and execute
     all activities involved in the provision of the Operating Services on
     behalf of all of the Contractors, in accordance with this Agreement and
     the relevant Development Plans, Annual Work Programs and Budgets and
     Exploration Activities. The Operator shall be responsible for the full and
     timely performance of all obligations of the Contractors under this
     Agreement with respect to any Field or Exploration Activity for which it
     is Operator, except the obligations set forth in Clauses XXV and XXVII.
     This Clause shall not relieve any Contractor from any of its obligations
     under this Agreement

     (b) No later than 60 days after the execution of this Agreement, the
     Operator shall sign an accession agreement in the form of Annex G hereto,
     and upon such signature the Operator shall become a Party to this
     Agreement with no further action on the part of any other Party.
     Concurrently with the signature of the accession agreement, the Operator
     shall deliver to the Affiliate a guarantee from UNION TEXAS PETROLEUM
     HOLDINGS, INC. (the "Operator Guarantor") of the obligations of the
     Operator hereunder in the form attached hereto as Annex J. Except as
     otherwise approved by the Affiliate, no physical operations may be
     conducted by the Contractors hereunder prior to the signature of such
     accession agreement and the delivery to the Affiliate of such guarantee.

10.2 Following the first anniversary of the Effective Date, the Contractors may
     nominate a Person other than the original Operator to act as Operator with
     respect to any Field, or to implement any Exploration Activity; provided
     that such Person can demonstrate adequate experience, qualifications and
     financial capacity. The Person so nominated must be a Contractor or an
     Associated Entity of a Contractor. Such nomination is subject to approval
     by the Affiliate pursuant to Clause 5.2. Upon such approval, the execution
     by such other Person of an accession agreement substantially in the form of
     Annex G and, if required by the Affiliate, the execution by an Associated
     Entity of such other Person of a guarantee in the form of Annex J, such
     other Person shall be appointed as Operator for the applicable Field or
     Exploration Activity, and the original Operator shall cease to be the
     Operator with respect thereto. The Person appointed as Operator shall, with
     respect to such Field or Exploration Activity, perform all of the
     obligations and undertake all of the responsibilities of the Operator set
     forth in this Agreement.

10.3 The Operator or an Associated Entity of the Operator shall at all times
     maintain a Participation of at least 30% in the Initial Field and in each
     other Field (or Exploration Activity) as to which it acts as Operator (or
     27%, if EPIC takes a 10% Participation in such Field or Exploration
     Activity). The Contractors shall make and maintain at all times such
     arrangements among themselves for such transfers of Participations as may
     be necessary to ensure compliance with this minimum Participation
     requirement in the event




                                       27
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                                                                   BOQUERON AREA


     that the Operator is removed or resigns or in the event that a separate
     Operator is appointed for any Field (or Exploration Activity).

     No voting securities of an Operator whose obligations under the Agreement
     are guaranteed by another Person as a condition of its acting as Operator
     may be owned, held or pledged, directly or indirectly, by or to any Person
     other than a Contractor or the Associated Entity of a Contractor, without
     the prior approval of the Affiliate in its discretion. For this purpose,
     "voting securities" shall include all shares or equivalent interests
     having a right to vote with respect to the management of the Person
     concerned, together with any options, warrants, securities, instruments,
     indebtedness or other rights that are at any time exercisable for or
     convertible or exchangeable into such shares or equivalent interests and
     any proxy or power to vote any such shares or equivalent interests.

10.4 The Operator with respect to any Field may resign as Operator at any time
     by so notifying the other Parties at least ninety (90) days prior to the
     effective date of such resignation, except that no such resignation shall
     become effective except as set forth in Clause 10.8(a), and no such
     resignation may become effective before the first anniversary of the
     Effective Date.

10.5 The Operator with respect to any Field shall be removed as Operator upon
     receipt of notice from any other Party if:

     (a)  An order is made by a court or an effective resolution is passed for
          the reorganization under any bankruptcy law, dissolution, liquidation,
          or winding up of the Operator or Operator Guarantor, which order shall
          not have been vacated, discharged, stayed or bonded pending appeal
          within sixty (60) days from the entry thereof;

     (b)  The Operator or such Operator Guarantor dissolves, liquidates or
          terminates its existence;

     (c)  The Operator or such Operator Guarantor becomes insolvent, bankrupt
          or makes an assignment for the benefit of creditors;

     (d)  A receiver is appointed for a substantial part of the Operator's
          assets or those of such Operator Guarantor; or

     (e)  The Operator or such Operator Guarantor commences a voluntary
          receivership, bankruptcy, insolvency, dissolution, liquidation,
          reorganization or similar proceeding.

10.6 The Operator with respect to any Field may be removed by the Affiliate if
     the Operator has committed a material breach of this Agreement and has
     failed to cure that breach within ninety (90) days of receipt of a notice
     from the Affiliate detailing the alleged breach.



                                       28
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                                                                  BOQUERON AREA


10.7     Following the resignation or removal of an Operator pursuant to Clause
         10.4, 10.5 or 10.6, the Contractors shall meet as soon as possible to
         nominate a replacement Operator that meets the requirements of Clauses
         10.2 and 10.3, and shall present such nomination to the Affiliate for
         approval.  Notwithstanding the foregoing, in the event the Operator
         disputes commission of or failure to rectify a material breach alleged
         pursuant to Clause 10.6 and proceedings are initiated pursuant to
         Clause 23.2, no permanent replacement Operator may be appointed
         pending the conclusion or abandonment of such proceedings but the
         Contractors may, with the approval of the Affiliate as provided in
         Clause 10.2, designate one of the Contractors (or its Associated
         Entity) as interim Operator pending the conclusion of such
         proceedings.  The Affiliate shall have no liability to the original
         Operator in the event that it is replaced in accordance with the
         preceding sentence.

10.8     (a)      No resignation of an Operator may become effective, nor may
                  any replacement Operator begin providing Operating Services
                  following the resignation or removal of the previous Operator,
                  until such time as the replacement Operator has been nominated
                  by the Contractors and approved by the Affiliate.  Upon such
                  approval, the execution by the successor Operator of an
                  accession agreement substantially in the form of Annex G and,
                  if required by the Affiliate, the execution by an Associated
                  Entity of such successor Operator of a guarantee in the form
                  of Annex J, the successor Operator shall succeed to all
                  duties, rights and authority prescribed for the Operator, and
                  the former Operator shall transfer to the replacement Operator
                  custody of all property used in the provision of the Operating
                  Services, books of account, records and other documents
                  maintained by the Operator pertaining to the Area and to the
                  Operating Services.

         (b)      Upon delivery of the above-described property and data by the
                  former Operator, whether in the event of resignation or
                  removal, the former Operator shall be released and discharged
                  from all obligations and liabilities as Operator arising or
                  accruing after such date, but shall not be released from
                  obligations and liabilities arising or accruing prior to such
                  date or for any acts, occurrences or circumstances taking
                  place or existing prior to such date.

         (c)      The Contractors acknowledge that the Affiliate may, as a
                  condition to granting approval of the appointment of a new
                  Operator for the entire Area or for any Field or Exploration
                  Activity, require, among other things, that the new Operator
                  and the original Operator agree to reasonable measures to
                  coordinate reporting and other administrative matters relating
                  to this Agreement, and that an audit or inventory be conducted
                  as of approximately the time operations are transferred to the
                  new Operator.  The costs of such audit or inventory shall be
                  paid by the Contractors and included in the calculation of the
                  Service Fee, except that in the event of removal of the
                  Operator pursuant to Clause 10.6, such costs shall be paid by
                  the outgoing Operator or the Contractors and shall not be
                  included in the calculation of the Service Fee.




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                                                                 BOQUERON AREA

                                       XI

                         CONDUCT OF OPERATING SERVICES

11.1  (a) All operations and activities relating to the provision of the 
      Operating Services shall be carried out by the Operator on behalf of the
      Contractors in accordance with:

      (i)   The Laws and Decisions of competent bodies of the Republic of
            Venezuela;

      (ii)  The specific requirements of this Agreement, the Development
            Plans, the Annual Work Programs and Budgets, Exploration Activities
            and the decisions of the Affiliate made pursuant to Clause 5.2;

      (iii) The collective bargaining agreements of the Affiliate relating
            to the oil industry, to the extent applicable; and

      (iv)  International Oil Industry Standards.

      (b) The Contractors shall apply for all permits required by Venezuelan Law
      and Decisions in order to permit the Contractors to provide the Operating
      Services. The Affiliate will cooperate with the Contractors in obtaining
      and maintaining such permits in force and will take all reasonable steps
      that may be requested by the Contractors to cause the issuance of such
      permits, including making application in its own name where application in
      the name of the Contractors or Operator is not possible. The Contractors
      may at their option, by notice to the Affiliate, suspend any Operation
      Period if:
        
      (i)   operations in all or any portion of the Area or the relevant Field
            are substantially impeded for a period of at least sixty (60) days
            due to the absence of a permit required under Venezuelan Law and
            Decisions for such operations; and
     
      (ii)  the Contractors have taken and are continuing to take
            reasonable measures to obtain such permit in accordance with 
            relevant Law and Decisions (including without limitation submitting
            all documents and information to relevant governmental authorities
            that are reasonably capable of submission at the relevant time).
       
      During the suspension, all operations in the Area or the relevant Field
      must be discontinued, except that activities necessary or useful to obtain
      the relevant permit may continue. Any such suspension will be lifted
      either (i) at the option of the Contractors or (ii) if the Contractors
      fail to continue to take reasonable measures to obtain the relevant
      permit, at the Affiliate's option. The relevant time period will
      recommence upon the lifting of the suspension. Time lapsed during the
      suspension will not count against the relevant time period.

11.2  (a) The Affiliate shall allow the Operator to use free of charge in
      activities relating to the Operating Services all of its rights to the 
      use of land, rights of way and rights of passage, water rights, and other
      rights of any nature whatsoever relating to the Area and upstream of the 




                                         30

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                                                                   BOQUERON AREA


         Delivery Point (other than rights to fixed assets, which are subject to
         Clause XII), until the termination of this Agreement with respect to
         the Area in accordance with Clause XIX or Clause XX. The Operator shall
         be entitled to use such rights solely in connection with activities
         relating to the Operating Services, and may not use them for any other
         purpose or transfer or otherwise dispose of such rights in any manner
         without the prior consent of the Affiliate. Such rights in respect of
         activities relating to the Operating Services are granted to the
         Operator with respect to the Area on an exclusive basis, subject to
         Clause 11.3. However, in no event will the exercise of such rights by
         the operator imply any assignment of title on the part of the
         Affiliate, nor will it deprive the Affiliate of the use of such rights
         for purposes unrelated to the activities contemplated in this Agreement
         in a manner that will not materially interfere with such activities.
         The Affiliate shall provide reasonable assistance to the Operator upon
         request in securing such rights to facilitate the orderly provision of
         the Operating Services.

         (b) In order to permit the Contractors to continue the Baseline
         Production, the Affiliate shall be obligated to supply to the
         Contractors:

              (i) Natural Gas at the appropriate Receipt Point, in the volumes
              and at the pressure used by the Affiliate as of the Takeover Date
              for purposes of gas lift in connection with the Baseline
              Production (provided that the Contractors will be required to
              return to the Affiliate at the relevant Delivery Point at least
              95% of the volume of Natural Gas so provided);

              (ii) electric power at the appropriate Receipt Point in the
              amounts used by the Affiliate as of the Takeover Date in
              connection with the Baseline Production; and

              (iii) water at the appropriate Receipt Point in the volumes and at
              the pressure used by the Affiliate as of the Takeover Date for
              purposes of water injection in connection with the Baseline
              Production;

         in each case, (1) at prices that shall be no higher than the
         Affiliate's standard tariff for the service concerned or, if the
         Affiliate has no standard tariff, a reasonable price to be negotiated
         between the Affiliate and the Contractors, and (2) subject to
         reductions in such supply to the extent that such supply is no longer
         necessary to maintain the Baseline Production. In each case, usage as
         of the Takeover Date shall be average usage as measured during the
         transition period pursuant to Clause 11.8.

11.3     In the event that any activities proposed by the Operator or the
         Affiliate in the Area or in any areas adjacent to the Area (unrelated
         to the Operating Services, in the case of proposed activities of the
         Affiliate in the Area) conflict with or may conflict with any existing
         or proposed activities of the other, the Operator and the Affiliate
         shall attempt to develop a plan to allow both parties to conduct their
         activities without interference with one another; provided that, in the
         absence of agreement on such a plan, the following priorities will
         apply;

         (i)  existing activities and activities of the Contractors included in
              an approved Annual Work Plan and Budget will have priority over
              proposed activities; and 


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      (ii) otherwise, the Affiliate's proposed activities will have priority.

      In any event, the Affiliate will give the Operator at least 90 days
      notice of any planned activities that may conflict with activities of the 
      Operator in the Area. In no event may the Affiliate's activities in the
      Area, taken as a whole, be so extensive as to interfere with the 
      Contractor's practical ability to conduct the activities contemplated by 
      this Agreement (including, without limitation, the Contractors' right to 
      conduct Exploration Activities).

11.4  An object of this Agreement is for the Contractors to conduct their 
      activities in the most cost effective manner, to the extent consistent
      with the work objectives and standards that the Contractors are to meet. 
      The Contractors will be required to provide reports to the Affiliate
      with respect to costs incurred in connection with operations under this 
      Agreement, in accordance with the Uniform Reporting System. The Affiliate 
      will review the reports with a view to comparing the cost efficiency of 
      contractors conducting activities in different areas that are subject to 
      similar operating service agreements. If the Affiliate determines that
      the Contractors are incurring Chargeable Expenditures that are
      significantly above the level of other contractors for similar
      activities, the Affiliate may require that the Contractors meet with the
      Affiliate to explain the level of their Chargeable Expenditures and
      present a plan for cost reductions.

11.5  All contracts entered into by the Operator in connection with the
      provision of the Operating Services shall be consistent with the
      contracting policies adopted under this Agreement. All contracts or other
      arrangements for the furnishing of goods or services by, or the provision
      of goods or services to, the Operator, a Contractor or any Associated
      Entity of the Operator or a Contractor shall be on terms that would be no
      less favorable to the Operator or such Contractor than the terms that
      could reasonably be obtained in respect of a similar contract or
      arrangement from third parties, unaffiliated with the Operator or any
      Contractor, that regularly provide such goods and services on
      international markets or in Venezuela.

11.6  The Operator will be required to contract for any required goods or 
      services in such a manner as to ensure that it obtains the most 
      advantageous cost in keeping with the objectives of this Agreement, and
      to take into account both quality as well as delivery time for such goods
      or services. To the extent efficient, practicable and likely to result
      in the most advantageous contracting terms, contracts shall be awarded
      on the basis of competitive bids. In cases where there is a supply of
      both Venezuelan as well as non-Venezuelan goods or services (including
      goods or services available from the Affiliate), the participation of
      such Venezuelan goods or services in the bidding or contracting process
      must be assured, and when such Venezuelan goods or services are
      equivalent in cost, quality and delivery time to the non-Venezuelan goods
      or services, the Operator will acquire such Venezuelan goods or
      services. In any event, in order to guarantee the optimal quality of the
      goods or services acquired, any non-Venezuelan supplier of goods or
      services must comply with the same requirements as are imposed on any
      Venezuelan supplier of goods or services. For the purposes of this
      clause, Venezuelan goods or services will be understood to mean those
      goods or services supplied by offices or plants that provide such goods
      or services in Venezuela.



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11.7   (a)     The Operator and the Contractors shall be responsible for
               engaging employees, subcontractors, agents and other
               representatives in the course of the Operating Services, and
               shall be responsible for all injuries (or death) of their
               employees and those of such subcontractors, agents and other
               representatives and for all loss or damage to the property of
               such employees, subcontractors, agents and other representatives.
               The Operator and the Contractors shall be exclusively responsible
               for the performance of the obligations assumed in respect of
               employees performing the Operating Services by virtue of the
               Organic Labor Law, the Social Security Law, the INCE Law, the
               regulations adopted under any such law, the provisions of any
               collective bargaining or other labor agreements generally
               applicable to the oil industry in Venezuela, and any other law,
               regulation or other norm relating to the relations between
               employers and employees. Neither the Operator nor the Contractors
               will have any obligation to engage any current employees of the
               Affiliate or of its Associated Entities, subcontractors or
               agents.

       (b)     In the event that the Operator experiences strikes or other labor
               disputes with its employees, the Operator shall keep the
               Affiliate informed as to the results of the Operator's efforts to
               resolve such disputes. If the Affiliate informs the Operator that
               any such labor dispute has resulted, or creates a significant
               risk of resulting, in collective action being taken by the
               Affiliate's employees in support of the Operator's employees,
               then the Operator shall consult with the Affiliate with a view to
               protecting adequately the interests of both the Operator and the
               Affiliate, subject to the Operator's obligations to conduct
               operations hereunder in accordance with the standards set forth
               in Clause 11.1.

11.8   (a)     No later than 15 days following the Effective Date, the Operator
       (or, if the Operator has not yet signed the Agreement pursuant to Clause
       10.1, one of the Contractors) shall submit to the Affiliate:

       (i)     a description and timetable of the activities that the
               Contractors propose to conduct in the Area in order to prepare
               the Development Plan for the Initial Field and the environmental
               audit required by Clause 22.3, which activities may include
               visual inspection and testing of surface facilities that do not
               unreasonably interfere with normal operations, but may not
               include any drilling, seismic or other subsurface activities; and

       (ii)    an interim budget indicating the Chargeable Expenditures that the
               Contractors expect to incur during the period between the
               Effective Date and the Takeover Date, which interim budget shall
               be revised from time to time to reflect any significant
               additional Chargeable Expenditures that the Contractors expect to
               incur.

       Except as provided above or as otherwise approved by the Affiliate, the
       Operator may not commence physical operations in the Area until the
       Affiliate has approved the Development Plan and the first Annual Work
       Program and Budget for the Initial Field.




                                       33



   37
                                                                   BOQUERON AREA


         (b)   In addition to the matters required by Clause 6.2, the
         Development Plan for the Initial Field shall include a plan for the
         transfer of operations from the Affiliate to the Operator, describing
         inter alia:

         (i)   all significant transition arrangements;

         (ii)  the operations to be conducted in common on a trial basis by
               both the Operator and the Affiliate, and the duration of such
               operations in common, (which operations in common may commence
               prior to approval of the Development Plan, if the Affiliate
               agrees);

         (iii) plans for the sharing of facilities and the coordination of
               activities with the Affiliate, to the extent then known, in
               accordance with Clauses 11.9 and 12.3; and 

         (iv)  the proposed Takeover Date.

          (c)  The "Initial Baseline Production" for the first Quarter of the
          Operation Period will be determined as follows:

          "Initial Baseline Production" will be equal to the arithmetic mean of
          the actual volumes of Production of all of the wells in the Initial
          Field for the three months in the immediately preceding Quarter, as
          reported in the official monthly Production reports submitted by the
          Affiliate to the Venezuelan Ministry of Energy and Mines, and then
          reduced by the Baseline Production Decline Factor for one Quarter in
          the manner provided in the definition of "Baseline Production"
          (assuming that AP, for this purpose equals such mean of the actual
          Production of such wells). All volumes of Production shall be measured
          in a manner consistent with past practice and corrected to a water
          content of 0.1% in the case of Liquid Hydrocarbons containing more
          than 0.1% water. Except as provided in the following paragraph, the
          volumes of Production reported on such official reports for the three
          months in such immediately preceding Quarter will be conclusive and
          binding in determining Initial Baseline Production. In addition, under
          no circumstances, will the amount of the Baseline Production Decline
          Factor be subject to review, discussion or modification.

          In the event that major maintenance to facilities results in a
          significant curtailment or reduction of the Production of any wells in
          the Initial Field during any month in such immediately preceding
          Quarter, then for purposes of determining the total, average
          Production of the Initial Field in such Quarter, the average
          Production of such wells during such Quarter shall be determined as
          follows:

               (i)  if the curtailment or reduction affects Production from such
                    wells in only one month in such Quarter, then the average
                    Production from such wells shall be based on the actual
                    Production from such wells in the two unaffected months as
                    reported in such official monthly reports, extrapolating to
                    account for the affected month on the basis of the two
                    unaffected months; and 

              (ii)  if the curtailment or reduction affects Production from such
                    wells in more than one month in such Quarter, then the 
                    average Production from such wells shall be based




                                       34


                         
   38
                                                                   BOQUERON AREA

                  on the actual Production of such wells during the most recent
                  three-month period that is not affected by such maintenance,
                  as reported in such official monthly reports, and adjusted by
                  the Baseline Production Decline Factor through such
                  immediately preceding Quarter.

         For information purposes only, the Affiliate will provide the
         Contractors with such official monthly Production reports for all
         wells in the Initial Field, for the three months preceding the
         Effective Date and for each month thereafter as it becomes available
         until the Takeover Date.  The Affiliate shall also provide the
         Contractors with a description of its Production measurement, testing
         and allocation procedures for the Initial Field. The Contractors may
         observe the Affiliate in the conduct of measurements of the Production
         of such wells.

         (d)     Expenses incurred by the Contractors after the Effective Date
         and prior to the Takeover Date will be recoverable as part of the
         Service Fee for the Initial Field to the extent that they (i)
         constitute Chargeable Expenditures allocable to the Initial Field in
         accordance with the Accounting Procedures; (ii) are included in the
         interim budget submitted in accordance with Clause 11.8(a), as amended
         from time to time, and (iii) are included in the Development Plan and
         initial Annual Work Program and Budget as subsequently approved.

11.9     The Operator shall coordinate its activities in providing the
         Operating Services with the activities conducted by the Affiliate in
         and around the Area.  In particular:

         (a)     The Operator shall ensure that its automation and information
                 systems are capable of interfacing with those of the Affiliate;

         (b)     The Contractors and the Operator shall endeavor to enter into
                 agreements or arrangements with the Affiliate and its
                 Associated Entities or other parties to reduce the costs of the
                 Operating Services or to optimize operations relating to the
                 Operating Services by joining with such other parties in the
                 construction, funding, operation and/or use of assets and
                 facilities relating to the Operating Services; and

         (c)     The Operator shall endeavor to utilize equipment in connection
                 with the Operating Services that is consistent with the norms
                 and standards of the Affiliate, to the extent consistent
                 with the Operator's obligations under this Agreement (including
                 without limitation the Operator's obligations under Clause
                 11.4).

         The Affiliate shall provide the Operator with such information as the
         Operator may reasonably request to permit the Operator to comply with
         its obligations under this Clause 11.9.

11.10    (a)     (i)  Prior to commencing any Operating Services and for so
                 long as any Operating Services are conducted, the Contractors
                 and the Operator will be required to provide the Affiliate
                 with satisfactory evidence:

                             (1)(A)  that they have obtained and are maintaining
                 in force all-risk construction, property and casualty, third
                 party liability, well control and other insurance policies from
                 reputable insurance companies with regard to the Operating
                 Services, in each case covering such risks and in such amounts
                 as the




                                       35

         
   39
                                                                  BOQUERON AREA


      Affiliate notifies to the Contractors that it would have obtained in the
      ordinary course of business had it decided to perform the Operating
      Services directly, and (B) that they have adequate financial capacity to
      cover any risks that are subject to deductibles under such insurance
      policies, that they propose to self-insure; or

          (2)  that they have the financial capacity to self-insure any such
      risks for which they do not obtain insurance.

      Subject to the following paragraph, the cost of any premiums in respect 
      of such insurance policies (including premiums paid to captive insurance
      companies and a customary and reasonable charge in respect of any self-
      insurance) may be included in the calculation of the Service Fee pursuant
      to the Accounting Procedures. The Contractors and Operator may obtain
      additional insurance of types or in excess amounts beyond the 
      requirements of this Clause, but the premiums in respect of such 
      additional insurance may not be included in the calculation of the 
      Service Fee pursuant to the Accounting Procedures.

      (ii) The Affiliate may, but shall not be obligated to, offer to obtain or
      continue some or all of such insurance policies from a reputable insurance
      company or companies on behalf of the Contractors and to cause the
      Contractors and the Operator to be listed as co-insured parties on any
      such insurance policy (with a waiver by the insurer of any right of
      subrogation in respect of the co-insured). The Affiliate may charge the
      Contractors and the Operator a premium for any such insurance, which
      premium may then be included in the calculation of the Service Fee. The
      Contractors and the Operator shall not be required to accept the
      Affiliate's offer to obtain or continue any such insurance and may obtain
      the necessary insurance elsewhere; provided that, in this case, the
      amount of the premiums with respect to such insurance that may be included
      in the calculation of the Service Fee may not exceed the premium offered
      by the Affiliate for such insurance and the Contractor or Operator
      concerned shall offer to cause the Affiliate to be listed as a co-insured
      party on such alternative insurance policy (with a waiver by the insurer
      of any right of subrogation in respect of the co-insured).

      (iii) Prior to approval of the Development Plan for the Initial Field, 
      the Affiliate shall provide the Contractors with a schedule showing (1)
      the types and amounts of insurance that will be required under this 
      Clause 11.10(a),(2) the extent to which the Affiliate is offering to 
      obtain some or all of such insurance on behalf of the Contractors 
      (including a description of any deductibles and policy limits), and (3) 
      the premiums, if any, that the Affiliate proposes to charge for any such
      insurance that it obtains on behalf of the Contractors and Operator. The 
      Affiliate may in its discretion and from time to time amend such schedule
      and the scope or cost of such insurance coverage, upon 30 days prior 
      written notice.

(b)   In the event that the Operator obtains insurance proceeds following its 
      submission of a claim under any of the insurance policies of the 
      Affiliate referred to in Clause



                                       36

      
      
   40
                                                                  BOQUERON AREA


      11.10(a)(ii) where it is listed as a co-insured, the Operator shall 
      either (i) apply any such proceeds to remedy the loss or damage in 
      respect of which the insurance claim was paid, and promptly pay over any
      remaining balance in respect of such proceeds to the Affiliate, or (ii)
      notify the Affiliate that it does not intend to remedy such loss or 
      damage and promptly pay over the entirety of such proceeds to the 
      Affiliate. The Operator shall make the determination as to whether to 
      apply any insurance proceeds to remedy the relevant loss or damage in
      accordance with International Oil Industry Standards.

(c)   In the event the Affiliate obtains insurance proceeds relating to losses
      sustained in connection with the Operating Services following its 
      submission of a claim under any of the insurance policies of the 
      Affiliate referred to in Clause 11.10(a)(ii), the Affiliate shall notify
      the Operator to such effect, and within 90 days of the Operator's receipt
      of such notice, the Operator may notify the Affiliate that the Operator 
      intends to remedy the loss or damage in respect of which such payment was 
      made. Promptly following receipt of such notice from the Operator, the 
      Affiliate shall pay over to the Operator the amount of such payment for 
      application to such remediation. In the event that the amount paid to the 
      Operator exceeds the amount necessary to effect such remediation, the 
      Operator shall pay over any remaining balance to the Affiliate.

(d)   The Contractors shall be responsible for remedying any loss or damage to
      the facilities, properties, equipment and other assets of the Affiliate 
      (other than normal wear and tear in the ordinary course) that result from 
      activities conducted pursuant to this Agreement. The Contractors shall 
      make up any amount necessary for such remediation that is not fully 
      covered by the cash proceeds from any insurance policies carried pursuant
      to Clause 11.10(a), including by reason of deductibles or maximum damage
      awards, and shall apply such amount to remedy the relevant loss or damage
      or shall pay such amount to the Affiliate on the same basis as insurance 
      proceeds received by the Operator are to be applied pursuant to Clause 
      11.10(b). Unless such loss or damage results from the gross negligence or
      willful misconduct of the Operator or a Contractor, the amounts spent by 
      the Contractors in remediation shall be Chargeable Expenditures.

      The Affiliate shall be responsible for remedying any loss or damage to 
      the facilities, properties, equipment and other assets of the Operator or
      Contractors that result from the separate activities of the Affiliate 
      conducted in the Area during the term of this Agreement.

(e)   The Contractors shall indemnify the Affiliate, its Associated Entities 
      and the officers, directors, employees, agents and consultants of the 
      Affiliate and its Associated Entities, from, and hold each of them 
      harmless against, any and all costs, expenses (including without 
      limitation reasonable legal costs, expenses and attorneys' fees) and 
      liabilities that arise from or are incident to claims, demands or causes
      of action of every kind and character brought by or on behalf of (1) any
      Person for damage to or loss of property or the environment, for injury 
      to, illness



                                       37
      
   41
                                                                   BOQUERON AREA


              or death of any Person (including without limitation any
              employee of the Contractor or the Affiliate), or for infringement
              of an patent, copyright or similar rights, in each case to the
              extent such costs, expenses and liabilities arise from or are
              based upon activities conducted pursuant to this Agreement, or
              (2) any employee of the Operator, any Contractor or any of their
              respective subcontractors or agents for compensation in respect of
              work or activities relating to performance of the Operating
              Services (except where the Affiliate or its Associated Entity is
              the subcontractor that employs such employee). Without prejudice
              to the right to indemnity hereunder, the Contractors will have the
              right to assume the defense of any such claim, demand or cause of
              action for which indemnity is sought, and the Affiliate shall not
              settle any such claim, demand or cause of action without the 
              consent of the Operator.

         (f)  The Affiliate shall indemnify the Contractors, the Operator, their
              respective Associated Entities and the respective officers,
              directors, employees, agents and consultants of the Contractors,
              the Operators and their Associated Entities, from, and hold each
              of them harmless against, any and all costs, expenses (including
              without limitation reasonable legal costs, expenses and attorneys'
              fees) and liabilities that arise from or are incident to claims,
              demands or causes of action of every kind and character brought by
              or on behalf of any Person for damage to or loss of property or
              the environment, for injury to, illness or death of any Person
              (including without limitation any employee of a Contractor, the
              Operator or the Affiliate), or for infringement of any patent,
              copyright or similar rights, in each case to the extent such
              costs, expenses and liabilities arise from or are based upon
              activities conducted by the Affiliate in the Area after the
              Takeover Date. Without prejudice to the right to indemnity
              hereunder, the Affiliate will have the right to assume the defense
              of any such claim, demand or cause of action for which indemnity
              is sought, and the Contractors of Operator shall not settle any
              such claim, demand or cause of action without the consent of the
              Affiliate.
 

                                      XII

                        TITLE TO AND USE OF FIXED ASSETS

12.1     The Affiliate shall have exclusive title to (or, in the case of capital
         leases, shall be the named lessee of) all facilities, properties,
         equipment and other assets used by the Contractors to perform Operating
         Services hereunder, except for:
 
         (i)  immovable assets that are located inside or outside the Area whose
              costs of construction or acquisition are not included as
              Chargeable Expenditures in the calculation of the Service Fee;
  
         (ii) assets that are leased by the Contractors for use in connection
              with the Operating Services under leases that would not
              constitute capital leases under international accounting
              standards;


                                       38
   42
                                                                BOQUERON AREA


      (iii)     information, technology and data of the type referred to in
                Clause XXIV, title to which shall be governed by Clause XXIV;

      (iv)      movable assets introduced into the Area by the Contractors on a
                temporary basis to be used for a specific purpose; and

      (v)       other assets that, for reasons of economy or practical
                convenience, the Affiliate may agree with the Operator shall be
                owned by the Contractors.

      The Contractors shall not purchase or construct any real estate for the
      account of the Affiliate as provided above, without giving the Affiliate
      at least 60 days prior notice and discussing with the Affiliate the
      availability and relative cost of opportunities to rent the necessary real
      estate. If (a) such real estate is available for rental, (b) the Affiliate
      indicates that it would prefer rental to purchase and (c) there is no
      significant cost savings associated with purchase, the Contractors shall
      rent and not purchase such real estate.

12.2  All assets constructed or acquired by the Contractors in respect of which
      title is to vest in the Affiliate shall be deemed to have been constructed
      or acquired by the Contractors in the name and for the account of the
      Affiliate. The payment by the Contractors of the construction or
      acquisition costs of such assets shall be considered a non-recourse
      advance from the Contractors to the Affiliate, which shall be repaid
      solely through the payment by the Affiliate to the Contractors of the
      Service Fee, and which shall be amortized based on the principles
      specified in Article VI of the Accounting Procedures.

12.3  (a) Subject to the following sentence, the Operator shall have the
      exclusive right to use all assets constructed or acquired by the
      Contractors for the account of the Affiliate pursuant to Clause 12.2 free
      of charge for purposes relating to the provision of the Operating
      Services. If, in light of the relevant Development Plan, any such assets
      are expected to have significant capacity for an extended period of time
      that will not be used for the provision of the Operating Services and can
      be made available to the Affiliate without unreasonable interference with
      the Operating Services, the Operator shall, if requested, make such unused
      capacity available to the Affiliate free of charge except for payment of a
      fair and reasonable fee for operating and maintaining the asset concerned.
      If the Operator later wishes to use some or all of such previously unused
      capacity for the provision of Operating Services, it shall so notify the
      Affiliate and the Affiliate shall relinquish the capacity concerned no
      later than six months following the receipt of such notice.

      (b) Subject to Clause XXI, the Contractors shall have the right to use 
      free of charge, in connection with the Operating Services, all existing
      wells in the Area, the flow lines between such wells and gathering
      stations and all electricity lines, gas lines and water lines between the
      appropriate Receipt Point and such wells. In addition, Annex N lists
      certain other fixed assets in the Area or outside the Area that are
      appropriate for the Transportation and Handling of Hydrocarbons from the
      Area to the Delivery Point, that were constructed or acquired by the
      Affiliate prior to the Effective Date for use in connection with the
      discovery, appraisal or exploitation of the Initial Field or any other
      Hydrocarbon-bearing structure in the Area that is known to the Affiliate
      as of the 






                                       39

   43
                                                                   BOQUERON AREA


          Effective Date. The Operator shall have the right to use the assets
          listed thereon free of charge. The Operator shall operate all assets
          listed on Annex N. If the Operator wishes to use any assets other than
          as described above, it must obtain the Affiliate's consent and agree
          with the Affiliate on the terms on which the Operator may obtain the
          right to use such assets. The Affiliate may decline to grant such
          consent in its discretion.

          The Contractors shall have no obligation to use any such wells or flow
          lines or the assets listed on Annex N; provided that, except as
          specifically provided in Clause 22.5, the non-use of any such assets
          shall in no way affect or reduce the Initial Baseline Production or
          the Baseline Production and any replacement of such assets shall be
          subject to the requirements of Clause 11.4 and of Article IV of the
          Accounting Procedures that all Chargeable Expenditures hereunder be
          both reasonable and necessary.

          Except as may otherwise be specifically agreed between the Contractors
          and the Affiliate, all such wells, flow lines, assets listed on Annex
          N and any other facilities, installations, equipment, materials or
          other assets that the Affiliate may from time to time make available
          to the Contractors are offered and used "as is, where is", and neither
          the Affiliate nor any of its Associated Entities makes any
          representation or warranty, express or implied, as to the condition of
          any such assets, their suitability or fitness for their current use or
          any other use, or their compliance with applicable Law or Decisions,
          or shall have any liability resulting from their use in connection
          with the Operating Services.

          Without limiting the generality of the preceding paragraph, the
          Affiliate agrees that, between the Effective Date and the Takeover
          Date, the Affiliate will operate the Area only in the ordinary course,
          will not materially change the nature or extent of its activities in
          the Area or dispose of or remove any material quantity of assets
          covered by this Clause 12.3(b), will substantially maintain and
          continue regular, scheduled programs of maintenance with respect to
          such assets, and in general will use reasonable efforts to preserve
          the existing activities and assets in the Area; provided that nothing
          in this paragraph shall require the Affiliate to repair or replace any
          well, flow line or other asset that may be damaged or lost, regardless
          of the cause of such damage or loss.

          (c) Neither the Operator nor the Contractors shall have the right to
          use any assets described in this Clause 12.3 for any purpose other
          than for use directly in connection with the Operating Services.

12.4      The Operator shall safeguard and maintain in good condition, subject
          to normal wear and tear, all assets that the Operator uses in
          accordance with Clause 12.3. The Operator shall not sell, lease or
          otherwise dispose of any asset that the Operator uses in accordance
          with Clause 12.3 without the prior approval of the Affiliate, which
          approval shall be in the Affiliate's discretion.

12.5      Upon the termination of the Operation Period in respect of any Field,
          all assets used with respect to such Field that the Operator uses in
          accordance with Clause 12.3 shall be transferred to the control of the
          Affiliate, except that:




                                       40
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                                                                   BOQUERON AREA


         (i)   assets and facilities that are to be removed pursuant to Clause
               21.1 shall either be transferred to the control of the Affiliate
               following removal or disposed of as scrap, as requested by the
               Affiliate; and

         (ii)  assets used with respect to a Field that are not necessary for
               the continuation of Production at such Field and that can be
               moved and used at another Field may, with the Affiliate's
               approval under Clause 12.4, be moved to such other Field, in
               which case (1) the transferee Field shall pay a fair and
               reasonable purchase price or fee to the Affiliate for such
               assets, and (2) such assets shall be transferred to the control
               of the Affiliate or removed, as applicable, at the end of the
               Operation Period for such other Field.
 
12.6      All revenues of whatever nature received in cash or in kind from the
          use, sale or other disposal of any assets owned by the Affiliate
          pursuant to this Clause XII or in connection with the provision of
          Operating Services (net of the reasonable expenses incurred directly
          in connection with generating such revenues, such as fees or similar
          expenses) shall be for the account of the Affiliate and, if received
          by any Contractor, shall be paid to the Affiliate promptly upon
          receipt, including without limitation:

         (i)   revenues from the sale, lease, licensing or other use of such
               assets or products of such assets, including without limitation
               pipeline facilities, storage facilities, loading and unloading
               facilities, surplus housing or office space or other
               infrastructure relating to the Operating Services;

         (ii)  the sale, lease or other disposal of materials or other
               property (whether immovable or movable) originally acquired or
               leased for use in connection with the provision of the Operating
               Services but no longer so used;

         (iii) the provision of services to third parties by the Operator or
               any Party using such assets;

         (iv)  the sale or other disposal of scrap or waste created as a result
               of the provision of the Operating Services;

         (v)   any interest or other charges received as a result of the
               deferred or late payment of any of the foregoing; and

         (vi)  any other revenue generated as proceeds of assets or property,
               the costs of which are included in the calculation of the
               Service Fee in accordance with the Accounting Procedures.




                                       41

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                                                                   BOQUERON AREA

                                      XIII
                                      
              HYDROCARBON RESERVOIRS EXTENDING OUTSIDE THE AREA

13.1      (a)  In the event that any part of a Hydrocarbon-bearing structure,
          formation or deposit for which the Contractors propose to submit a new
          Development Plan pursuant to Clause 8.4 or an amendment to an existing
          Development Plan pursuant to Clause 8.8 (or any part of any
          Hydrocarbon-bearing structure, formation or deposit that is Connected
          thereto) extends beyond the boundary of the Area, the Contractors
          shall so notify the Affiliate (unless the Connection with such part
          of a Hydrocarbon-bearing structure, formation or deposit extending
          beyond the Area boundary results exclusively from the existence of an
          Accumulation).  Thereafter, the Affiliate, assisted by the
          Contractors, shall use reasonable efforts to negotiate in good faith
          an agreement for a single development program for such
          Hydrocarbon-bearing structures, formations or deposits with any Person
          or Persons that have rights to the additional area to which they
          extend, that will enable the Contractors to provide Operating Services
          in accordance with this Agreement with respect to those parts of such
          Hydrocarbon-bearing structures, formations or deposits lying inside
          the Area.

          (b)   If the Affiliate owns the Hydrocarbon rights to the area outside
          the Area that includes such Hydrocarbon-bearing structures,
          formations or deposits, the Affiliate shall propose such a single
          development program in good faith or extend the Area to include the
          entirety of such Hydrocarbon-bearing structures, formations or
          deposits. The Affiliate shall be under no obligation to extend        
          the Area, and the Contractors shall have no right to require the
          Affiliate to do so. If the area outside the Area that includes such
          Hydrocarbon-bearing structures, formations or deposits is operated by
          a service contractor on behalf of the Affiliate, or if the
          Hydrocarbon rights to such area are owned by an Associated Entity of
          the Affiliate, the Affiliate shall endeavor to procure that such
          service contractor or Associated Entity, as the case may be, accepts
          such a single development program in good faith.

          (c)  Any such single development program shall provide for the optimum
          economic development or evaluation of the applicable
          Hydrocarbon-bearing structures, formations or deposits, without regard
          to the geographical areas in which they are located, and will enable
          the Contractors to provide the Operating Services as provided in this
          Agreement.

13.2      (a)  The Contractors must allow the Affiliate at least two years from
          the date of the notice provided in Clause 13.1 to reach agreement on a
          single development program (or to extend the boundary of the Area) as
          provided in Clause 13.1, before submitting a new Development Plan
          pursuant to Clause 8.4 or an amendment to an existing Development Plan
          pursuant to Clauses 8.8 and 9.1.

          (b)  Upon the earlier of (i) the entry into such an agreement by the
          Affiliate, the Contractors and any relevant other Person(s) (or
          extension of the Area by the Affiliate) and (ii) the expiry of such
          two-year period, the Contractors will be entitled to submit a
          Development Plan pursuant to Clause 8.4 or obligated to submit an
          amendment to an existing Development Plan pursuant to Clauses 8.8 and
          9.1, that in each case satisfies the




                                       42
  
   46
                                                                BOQUERON AREA

      requirements of the Agreement (except as such requirements may be modified
      with the consent of the Affiliate as a result of any agreement on a single
      development program).

      The Affiliate shall observe the same standards for approval of such
      Development Plan or amendment as are set forth respectively in Clause 8.5
      or Clauses 8.8 and 9.3, except that the Affiliate will be obliged to 
      approve any proposed Development Plan or amendment if:

      (i)      the proposed Field Boundary includes only those parts of
               Connected Hydrocarbon-bearing structures, formations or deposits
               that are located entirely inside the Area (taking into account
               any modifications of the Area boundary);

      (ii)     the Maximum Economic Rate for the proposed Field is determined
               based only on those parts of Connected Hydrocarbon-bearing
               structures, formations or deposits that are located entirely
               inside the Area (taking into account any modifications of the
               Area boundary); and

      (iii)    the production profile in the proved reserve case calls for
               Production at the lowest of (x) the Maximum Economic Rate for the
               proposed Field, (y) the aggregate of the Delivery Point
               Capacities of the different Delivery Points to which the
               Development Plan or amendment contemplates delivery of
               Hydrocarbons, and (z) the production levels contemplated by the
               agreed single development program, if any.

      In particular, if the two-year negotiation period provided above has
      expired without an agreement on a single development program (or extension
      of the Area), the Affiliate may not reject a proposed Development Plan or
      amendment to an existing Development Plan based on the absence of such an
      agreement. 

      (c) The period provided in Clause 19.2 will be extended by the shorter of
      (i) two years and (ii) the length of time following the notification
      provided in Clause 13.1 that is actually required to negotiate an
      agreement on a single development program (or extension of the Area), with
      respect to those parts of the Area that contain Hydrocarbon-bearing
      structures, formations or deposits that are covered by this Clause XIII.


                                      XIV

                             PRODUCTION CURTAILMENT

14.1  The Contractors may be required to curtail Production as a result of
      government measures adopted in implementation of Venezuela's international
      treaty commitments. Where such curtailments are required, the percentage
      curtailment applicable to Production under this Agreement shall not exceed
      the percentage level of production curtailment required of oil companies
      operating in Venezuela taken as a whole, including PDVSA's Associated
      Entities, determined in each case on the basis of available production
      capacity. For this purpose, "available production capacity" means capacity
      for the production of Hydrocarbons of the 




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                                                                   BOQUERON AREA

         types that are subject to the relevant treaty commitment, to the
         extent such capacity is currently in production at the relevant time,
         or as to which production may reasonably be commenced within three (3)
         months from the relevant time. The available production capacity with
         respect to a Field for any relevant period shall be based on the
         planned capacity set forth in the related Development Plan, and shall
         be revised in subsequent periods based on planned capacity for such
         periods. Any curtailment in capacity shall be applied pro rata to the
         Baseline Production and the Incremental Production at the relevant
         time. Where the Contractors are unable to recoup the resulting loss by
         increasing the rate of Production to the extent necessary to recoup
         such loss, the Contractors shall be entitled to receive an extension
         of the Operation Period, sufficient in duration to allow it to produce
         the same volume it failed to produce as a result of such curtailment.


                                       XV

                     TITLE TO AND TRANSFER OF HYDROCARBONS;
                     ROYALTIES; TRANSPORTATION AND HANDLING

15.1     The Affiliate shall hold the exclusive right, title and interest to any
         Hydrocarbons produced by the Contractors pursuant to this Agreement.

15.2     The Contractors shall be authorized to produce Hydrocarbons for the
         account of the Affiliate in volumes equivalent to those specified in
         the production profiles included in the Development Plans approved by
         the Affiliate (subject in each case to the tolerances specified in
         Annex H hereto, as they may be amended from time to time).

15.3     (a)  The Contractors may at any time request an increase in the
         Delivery Point Capacity of any Delivery Point, or the designation of
         an additional Delivery Point and an associated Delivery Point Capacity
         (and quality specifications), and in connection with any such request
         may offer to construct or acquire for the Affiliate facilities for the
         Transportation and Handling of the increased volumes by the Affiliate.
         The Contractors shall provide a description of any such proposed
         facilities (including in such description a proposed construction or
         acquisition timetable) together with the submission of the request by
         the Contractors for the increase in Delivery Point Capacity or
         designation of a Delivery Point. Such request may be made in the
         original Development Plan for any Field, an amendment to a Development
         Plan or otherwise.  

         (b)   If the request involves the use of any facilities or
         infrastructure of the Affiliate (or its Associated Entities) upstream
         of the exit flange on a transfer hose from which the Hydrocarbons
         concerned can be loaded on a tanker and exported from Venezuela (an
         "Export Point"), the Affiliate may approve or reject any such request
         in its discretion. If the request (i) does not involve use of any such
         infrastructure or facilities, (ii) provides for all infrastructure and
         facilities needed for the Transportation and Handling to the Export
         Point of Hydrocarbons meeting the minimum quality standards specified
         below (or as otherwise agreed by the Affiliate in its discretion) and
         (iii) is part of a Development Plan or an amendment thereto, such
         request shall be subject to the general approval and review criteria
         applicable to Development Plans




                                       44
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                                                                   BOQUERON AREA
          
         and amendments to Development Plans under Clauses VI and IX 
         respectively. A Delivery Point at the Export Point will have unlimited
         Delivery Point Capacity.

         The minimum quality standards for Liquid Hydrocarbons delivered at an
         Export Point shall be (1) an API gravity of at least 22 degrees, (2)
         water content (determined by means of distillation) of no more than
         0.5% for Liquid Hydrocarbons with an API gravity greater than 22
         degrees and no more than 1.0% for Liquid Hydrocarbons with an API
         gravity less than or equal to 22 degrees, and (3) the other quality
         standards stated in Annex H.

         (c)   If the Affiliate approves any such request other than in the
         context of a Development Plan or amendment thereto and the request is
         accompanied by a proposal to construct or acquire additional
         facilities, the Contractors shall be obligated to construct or acquire
         such facilities for the Affiliate within the time periods described in
         the request (as such time periods may be extended with the approval of
         the Affiliate).

15.4     (a)   The Contractors shall be required to deliver all Production to
         the Affiliate at the relevant Delivery Point or Points. If the
         Contractors experience operating problems or otherwise foresee that
         the volume of Production delivered in a given month will be
         significantly less than the volume provided in the relevant
         Development Plan and Annual Work Program and Budget, the Contractors
         shall give the Affiliate prompt notice of the nature of the problem,
         the extent and duration of the expected volume shortfall, and the
         measures being undertaken to remedy the problem and shall keep the
         Affiliate informed as to the evolution of the problem.

         (b)   The Affiliate shall be required to accept from the Contractors at
         each Delivery Point all Hydrocarbons in the volumes that the
         Contractors are authorized to deliver at such Delivery Point, subject
         to limitations due to reasonable and customary maintenance and repairs
         or to operating problems with respect to the facilities concerned.

         Prior to finalization of a proposed Annual Work Program and Budget in
         accordance with Clause VII, the Affiliate shall notify the Contractors
         of the proposed timing and duration of proposed routine maintenance
         and repairs to assets and facilities, that could affect the
         Affiliate's ability to accept delivery of Production at the relevant
         Delivery Point, during the period covered by such Annual Work Program
         and Budget. The Contractors shall make due allowance for such
         maintenance and repairs in the Annual Work Program and Budget. In the
         event of a need for unscheduled maintenance or repairs or of
         unforeseen operating problems, the Affiliate shall give the
         Contractors prompt notice of the nature of the problem, the extent and
         duration of any expected curtailment of capacity, and the measures
         being undertaken to remedy the problem and shall keep the Contractors
         informed as to the evolution of the problem. In any event, the
         Affiliate shall use its reasonable best efforts to minimize the
         duration and scope of any curtailment of capacity due to maintenance
         and repairs or to operating problems. In the event of a partial
         curtailment of capacity, the curtailment shall be applied pro rata to
         all users of the facilities concerned, including the Affiliate and
         PDVSA's other Associated Entities, based on the available production
         capacity of each, determined as provided in Clause 14.1. Any
         curtailment in capacity shall be applied pro rata to the Baseline
         Production and the Incremental Production. Where the Contractors are
         unable to recoup the resulting loss by increasing the rate of
         Production to the extent necessary to recoup such loss, the


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                                                                   BOQUERON AREA

         Contractors shall be entitled to receive an extension of the Operation
         Period, sufficient in duration to allow it to produce the same volume
         it failed to produce as a result of such curtailment.

15.5     All exploitation tax (royalty) payable pursuant to applicable
         Venezuelan law in respect of Production that the Contractor is
         authorized to realize hereunder shall be paid by the Affiliate.

15.6     In addition to the monthly production projections set forth in the
         Annual Work Program and Budget for each year, the Contractors must
         schedule delivery of Production to the Affiliate in accordance with a
         notification and delivery procedure to be established in
         accordance with the Uniform Reporting System.

15.7     The Contractors' duties will include the Transportation and Handling,
         or arranging for the Transportation and Handling, of all Hydrocarbons
         that are to be delivered to the Affiliate, from the wellhead or other
         point of extraction to the relevant Delivery Point.  Costs associated
         with the Transportation and Handling of all volumes delivered under
         this Agreement at a Delivery Point, whether in respect of construction
         of new facilities or the use of existing facilities, will be included
         in the calculation of the Service Fee, as provided in the Accounting
         Procedures.

15.8     In the event that a fiscalization point or other inspection point is
         required to be designated prior to the relevant Delivery Point in
         accordance with relevant Venezuelan laws and regulations or the
         requirements of the Ministry of Energy and Mines, such designation and
         any measurement or inspection at such fiscalization point or other
         inspection point shall not be deemed to constitute delivery of the
         relevant Hydrocarbons by the Contractor to the Affiliate or acceptance
         of such Hydrocarbons or the quality of such Hydrocarbons by the
         Affiliate. Such delivery and acceptance, and transfer of risk of loss,
         shall occur only at the relevant Delivery Point.

                                      XVI

                          GAS DISPOSITION AND HANDLING

16.1     In the event that the Contractors make a Free Gas Discovery, they will
         have the exclusive right for a period of 36 months following such Free
         Gas Discovery to negotiate an alternative arrangement with the
         Affiliate for the exploitation of such Free Gas Discovery. If a Free
         Gas Discovery is made less than 36 months prior to the last date on
         which this Agreement may terminate with respect to the areas in which
         the Free Gas Discovery is located, this Agreement will be extended
         with respect to such Free Gas Discovery until the expiration of 36
         months after the Free Gas Discovery is made.

16.2     Unless otherwise agreed, Associated Gas shall be used and disposed of
         in accordance with the following principles:


                                       46
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                                                                BOQUERON AREA

(i)      The Contractors shall be obligated to deliver to the Affiliate, and
         the Affiliate shall be obligated to accept, at the relevant Delivery
         Point, the volume of Associated Gas that is related to the Baseline
         Production ("Baseline Gas"), as determined on the basis of the gas to
         oil ratio for all Production from the Initial Field at the time
         concerned; provided that, if the Affiliate is using Baseline Gas in
         connection with Production from the Initial Field as of the Takeover
         Date, the Contractors will have the right to use such volume of
         Baseline Gas as is necessary to continue the Baseline Production. All
         Baseline Gas delivered to the Affiliate shall be delivered Wet at the
         Delivery Point.

         If the Affiliate does not wish to accept the Baseline Gas and the
         return of any Natural Gas provided by the Affiliate for gas lift, the
         Affiliate shall pay for whatever facilities or other expenses are
         necessary to dispose of all such Baseline Gas and Natural Gas in
         accordance with Venezuelan Law and Decisions. Any expenses that may be
         incurred by the Contractors and reimbursed by the Affiliate in this
         regard shall be the object of a separate agreement between the
         Contractors and the Affiliate and shall not be included in the
         calculation of the Service Fee. The Affiliate shall continue to accept
         the Baseline Gas until such facilities are available.

(ii)     The Contractors shall have the right to use all Associated Gas other
         than Baseline Gas ("Incremental Gas") in connection with performing
         the Operating Services hereunder. If requested by the Affiliate, the
         Contractors shall be obligated to deliver to the Affiliate at the
         relevant Delivery Point any Incremental Gas that they do not use in
         connection with the Operating Services. All Incremental Gas delivered
         to the Affiliate shall be delivered Wet at the Delivery Point.

(iii)    The Contractors shall pay the Affiliate for any Production of Natural
         Gas (including Baseline Gas and Incremental Gas) that is either used
         by the Contractors for any purpose other than reinjection or gas lift
         or disposed of in a manner requiring the payment of royalty under 
         Venezuelan law, at the official price as of the time of use for 
         Natural Gas for industrial uses, of the quality and in the location 
         concerned, as determined in accordance with applicable Venezuelan
         regulations as published most recently in the Gaceta Oficial. The
         cost of such Natural Gas shall be a Chargeable Expenditure that may be 
         included in the calculation of the Service Fee.

(iv)     The Affiliate may require that any volumes of Wet Baseline Gas or Wet
         Incremental Gas that the Contractors are planning to use for
         reinjection or gas lift in connection with the Operating Services
         pursuant to Clauses 16.2(i) or 16.2(ii) instead be delivered to the
         Affiliate at the relevant Delivery Point in exchange for the same
         volume of Dry Natural Gas delivered by the Affiliate to the
         Contractors either at the Receipt Point or at another mutually agreed
         location inside or outside the Area. There shall be no charge to the
         Contractors for the mere delivery of such Dry Natural Gas; the
         Affiliate may separately charge a reasonable fee for any compression
         of such Dry Natural Gas to a pressure higher than that at which the
         Wet Natural Gas is delivered to the Affiliate. Any royalty,
         exploitation tax or luxury and wholesale taxes due purely as a result
         or such exchange of Wet Natural Gas for Dry Natural Gas shall be paid
         by the Affiliate.

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                                                                   BOQUERON AREA


         (v)     Unless otherwise agreed by the Affiliate, the Affiliate shall
                 not be obligated to accept any Associated Gas that does not
                 satisfy the quality standards specified in Annex H. The
                 Contractors shall have no obligation to treat Associated Gas
                 in order to meet such standards. The Contractors shall dispose
                 of any Associated Gas not used in providing the Operating
                 Services or delivered to the Affiliate, in accordance with
                 Venezuelan laws and regulations.

                                      XVII

                           PAYMENT AND REIMBURSEMENT

17.1     In (i) reimbursement of advances made by the Contractors for the
         acquisition of goods and services on behalf of the Affiliate and (ii)
         compensation for the provision of the Operating Services hereunder,
         the Affiliate shall pay to the Contractors a cash fee in U.S. dollars
         (the "Service Fee"), determined in the manner set forth in Article V of
         the Accounting Procedures. The Service Fee will be calculated and paid
         Quarterly on the basis of statements and invoices presented by the
         Contractors pursuant to Clause XVIII.

17.2.    (a) In addition to the two components of the Service Fee described in
         Clause 17.1, the Affiliate will pay to the Contractors the luxury and
         wholesale taxes (or any other similar Venezuelan value added or sales
         taxes) that the Contractors are required by Venezuelan law to collect
         in relation to the portion of the Service Fee representing
         compensation for the Operating Services (as determined in accordance
         with Article VI of the Accounting Procedures). Such luxury and
         wholesale taxes will be calculated and paid in Bolivars.

         (b) The payment of luxury and wholesale taxes described in the
         preceding paragraph will be in addition to the reimbursement pursuant
         to Article 1.6.2 of the Accounting Procedures of luxury and wholesale
         taxes that are paid by the Contractors on goods and services acquired
         by the Contractors from third parties for the account of the
         Affiliate.

17.3     As more fully set forth in Article 5.4 of the Accounting Procedures
         and except as otherwise agreed by the Affiliate in its discretion, the
         Service Fee shall be calculated and paid separately by the Affiliate
         with respect to each Field, and only costs incurred within the Field
         Boundary of any such Field or that are otherwise allocable to such
         Field will be taken into account in determining the Service Fee in
         respect of such Field. Except as otherwise agreed by the Affiliate,
         any allocation of costs must be made in accordance with the mechanisms
         established pursuant to the Accounting Procedures, as well as with
         the following rules:

         (i)   No costs incurred by the Contractors in Exploration Activities
               performed outside the Field Boundaries of any Fields existing
               as such at the time of such activities may be included in the
               calculation of the Contractors' costs for such Fields.

         (ii)  Costs incurred by the Contractors in Exploration Activities
               will be included in the Service Fee calculations in accordance
               with Article 5.4.5 of the Accounting



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                                                                   BOQUERON AREA

               Procedures only with respect to a Field as to which a
               Development Plan is approved following the incurrence of such
               costs, except as otherwise approved by the Affiliate in its
               discretion. Upon the approval of such a Development Plan, all
               Well Expenditures incurred within the Field Boundary of the
               relevant Field, and all other Exploration Expenditures incurred
               since the date of approval of the most recent prior Development
               Plan, will be included in the Service Fee calculation for such
               Field, as provided in the Accounting Procedures.

         (iii) Costs that are associated with more than one Field, or with a
               Field and activities outside the Field Boundaries of the Fields,
               must be allocated in the manner set forth in the Accounting
               Procedures.

17.4     For purposes of calculating the Service Fee, the volume of all Liquid
         Hydrocarbons will be measured at the relevant Delivery Point(s)
         corrected to a water content of 0.1% in the case of Liquid
         Hydrocarbons having a water content greater than 0.1%, and the volume
         of all Natural Gas corrected to a content of impurities of no more than
         0.3%.

         All Incremental Production will be valued on the basis of the Price
         Formula. For purposes of applying the Price Formula to Liquid
         Hydrocarbons, the API gravity of all Production delivered at all
         Delivery Points in a Quarter will be deemed to be the average API
         gravity of all such Production weighted to take into account the
         actual volumes of Liquid Hydrocarbons having different API gravities
         delivered in such Quarter.

         Except as otherwise agreed by the Affiliate and the Contractors, the
         valuation of all Hydrocarbons made available at a Delivery Point in
         any Quarter shall be based on the average price determined in
         accordance with the Price Formula for each calendar day in such
         Quarter, without weighting based on the volume of Hydrocarbons
         delivered on any such day. There will be no payment for Associated Gas
         delivered to the Affiliate.

17.5     All payments of Service Fees and related luxury and wholesale or
         similar Venezuelan taxes on the compensation component thereof shall
         be made to accounts either inside or outside Venezuela to be
         designated by the Operator. The Affiliate shall be deemed to have
         fulfilled its obligations to pay the Service Fees and such taxes by
         payment to the Operator, and the Affiliate shall not be responsible
         for any failure by the Operator properly to divide any such payment
         among the Contractors. The sole recourse of the Contractors for any
         such failure shall be against the Operator.

                                     XVIII

                            STATEMENTS AND INVOICES

18.1     The Service Fee will be payable on a quarterly basis, against
         presentation by the Contractors of statements and invoices for the
         relevant Quarter, based on the volume of Production delivered to the
         Affiliate at the Delivery Point(s) in such Quarter. Payment will be
         made by the Affiliate


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         no more than 45 days following the receipt of each invoice. In the
         event that the Affiliate disputes all or any portion of an invoice and
         notifies the Contractor of the dispute within such 45-day period, the
         Affiliate shall pay the undisputed portion within such 45-day period
         and shall pay the balance upon resolution of the dispute. Any amount
         paid by the Affiliate after such 45-day period (including amounts
         subject to a dispute) shall bear interest from the last day of such
         45-day period to the date of payment at a rate adjusted each day equal
         to LIBOR for such day, plus 5% per annum. If the Affiliate notifies
         the Contractor of the dispute after payment, the Contractor shall
         refund any overpayment upon the resolution of the dispute. Any amount
         required to be refunded by the Contractor shall bear interest at the
         same rate, from the date of overpayment by the Affiliate to the date
         of the refund.

18.2     The luxury and wholesale taxes (or other similar Venezuelan value
         added or sales taxes) payable pursuant to Clause 17.2(a) shall be
         reflected separately in the invoices provided by the Contractors to
         the Affiliate.

18.3     Following the end of each Calendar Year, the statements and invoices
         for such Calendar Year will be reviewed by a firm of independent
         auditors designated by the Contractors and approved by the Affiliate,
         and, unless disputed by the Contractors, any adjustments found by such
         auditors will be reflected in the statement or invoice immediately
         following the delivery of the report of the auditors. Additional
         audits may be required by the Affiliate in accordance with the
         Accounting Procedures.

18.4     Payment of any invoice by the Affiliate shall not constitute a
         waiver of the Affiliate's right to object to all or part of such
         invoice. Such an objection may be raised by the Affiliate until the
         period for additional audits set forth in the Accounting Procedures
         expires and the resolution of any items found during the course of
         such audit or otherwise protested by the Affiliate during such period.

18.5     Invoice formats are specified in the Uniform Reporting System. All
         books used for purposes of calculating the Service Fee payable to the
         Contractors will be maintained in Dollars.

                                      XIX

                        TERM AND TERMINATION; EXTENSIONS

19.1    The term of this Agreement shall begin on the Effective Date and
        terminate as to each Field at the end of the Operation Period for such
        Field and as to areas outside a Field Boundary at the end of the
        period provided in Clause 19.2, subject in each case to early
        termination or extension as provided herein.

19.2    This Agreement will terminate after 5 years as to any part of the Area
        that is outside the Field Boundaries of the Fields existing at the end
        of such period, subject to possible extension pursuant to Clauses
        13.2 or 16.1.




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                                                                   BOQUERON AREA

19.3      The term of the Agreement or of the Operation Period for any Field may
          be extended with the approval of the Affiliate, upon request made by 
          the Contractors at least six months prior to the date on which the 
          Operation Period would otherwise expire. The Affiliate may grant or 
          deny such request in its discretion. In the event that any matter is 
          undergoing independent expert review in accordance with Clause 23.3 
          at the time the Agreement otherwise would have terminated with 
          respect to any Field (or proposed Field), this Agreement will be 
          extended with respect to such Field (or proposed Field) pending the 
          conclusion of the independent expert review.

19.4      At least 24 months prior to the termination of this Agreement with
          respect to any Field or area (or, in the case of early termination
          pursuant to Clause XX, as soon as practicable after the Contractors
          become aware of termination), the Contractors shall submit to the
          Affiliate a transition plan including at a minimum:

                 a)  a description of the assets that are used in connection 
                     with such Field or area and owned by the Affiliate 
                     pursuant to Clause 12.1;

                 b)  a description or any material assets that are used in 
                     connection with such Field or area and are not owned by
                     the Affiliate, including the identity of the owner of such
                     assets and the terms on which such assets are currently
                     used and might continue to be available after termination;

                 c)  a description of any material contracts, leases or other 
                     arrangements with third parties for the provision of goods
                     or services in connection with such Field and an
                     indication whether such contracts, leases or other
                     arrangements might be assigned or transferred to the
                     Affiliate upon termination;

                 d)  a description of the technology and other information
                     subject to Clause XXIV, and of the proposed treatment of
                     such technology and other information upon termination;

                 e)  the report required by Clause 21.1 regarding the status 
                     of wells and related assets in the Field; and

                 f)  a plan for the transfer of operations back to the 
                     Affiliate upon termination.

         Such transition plan shall be amended from time to time to reflect any
         material changes or developments in the information or plans provided
         therein. Upon the termination of this Agreement with respect to any
         area or Field, all assets, contracts, leases and rights that were used
         with respect to any area or Field and are owned by the Affiliate
         shall be delivered to the Affiliate, free and clear from any liens or
         encumbrances.

19.5     Upon the termination of this Agreement, all rights and obligations of
         the Parties hereunder shall terminate, except for the following rights
         and obligations, which shall survive such termination:

         (a)  Claims of a Party against another Party for damages arising 
              out of acts or omissions of the other Party relating to such
              other Party's obligations under this Agreement;


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         (b)  The provisions of Clause XXV, which shall remain in effect for
              five (5) years following such termination; and

         (c)  The provisions of Clauses XXI and XXII until all remaining
              obligations of the Contractors thereunder have been performed
              in full.

         Upon termination of this Agreement, no further payment, compensation
         or consideration of any kind will be due or payable by the Affiliate
         to the Contractors (except for any Service Fee in respect of
         Hydrocarbons delivered to the Affiliate prior to the date of
         termination or any expenses that are specifically made subject to
         reimbursement hereunder), regardless of whether the Service Fee paid
         during the term of this Agreement has been adequate to reimburse their
         costs and expenses or compensate their services in providing the
         Operating Services.


                                       XX

                         DEFAULT AND EARLY TERMINATION

         This Agreement may be terminated early by the Affiliate, and the
         Contractors may withdraw from and terminate this Agreement, on the
         terms and subject to the conditions set forth in this Clause XX.

20.1     In the event that the Contractors fail to submit a Development Plan
         for the Initial Field to the Affiliate for approval within the period
         specified in Clause 6.1, or that a Development Plan for the Initial
         Field is not approved within 12 months after the initial submission
         of a Development Plan pursuant to Clause 6.1, the Affiliate will be
         entitled to terminate this Agreement by notice in writing to the
         Contractors.

20.2     In the event that any Contractor breaches its obligations under this
         Agreement in any material respect, and such breach is not cured
         within ninety (90) days after the Affiliate provides notice to the
         Contractors of such breach, the Affiliate shall have the right to
         terminate this Agreement as to the breaching Contractor or all
         Contractors in its discretion; provided that, if such breach is
         reasonably capable of being cured and the Contractors begin to pursue
         a cure within such ninety (90) day period, no termination may be
         effected so long as the Contractors continue diligently to pursue such
         cure. Notwithstanding the foregoing, a breach by a Contractor of its
         obligations under Clause XXV or XXVII shall give rise to a termination
         right on the part of the Affiliate only with respect to the affected
         Contractor. Upon a termination with respect to a defaulting
         Contractor, such Contractor's Participations in each Field and
         Exploration Activity shall be automatically transferred to the
         non-defaulting Contractors, on a pro rata basis, in accordance with
         the respective Participations of the non-defaulting Contractors in
         each such Field or Exploration Activity.



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                                                                   BOQUERON AREA

20.3     In the event that any of the following events occurs with respect to
         any Contractor or any Person that guarantees such Contractor's
         obligations pursuant to Clause 3.2:

         (a)     An order is made by a court or an effective resolution is
                 passed for the reorganization under any bankruptcy law,
                 dissolution, liquidation, or winding up or such Contractor or
                 guarantor, which order shall not have been vacated,
                 discharged, stayed or bonded pending appeal within sixty (60)
                 days from the entry thereof,

         (b)     Such Contractor or any such guarantor dissolves, liquidates
                 or terminates its existence;

         (c)     Such Contractor or any such guarantor becomes insolvent,
                 bankrupt or makes an assignment for the benefit of creditors;

         (d)     A receiver is appointed for a substantial part of such
                 Contractor's assets or those of any such guarantor; or

         (e)     Such Contractor or any such guarantor commences a voluntary
                 receivership, bankruptcy, insolvency, dissolution,
                 liquidation, reorganization or similar proceeding,

         such Contractor shall have one hundred and twenty (120) days from the
         occurrence of such event to (i) transfer all of its rights and
         interests under this Agreement to such Person as the Affiliate may
         approve in accordance with Clause 27.1, or (ii) provide to the
         Affiliate a guarantee or such Contractor's obligations hereunder in
         form and substance, and from a guarantor, acceptable to the Affiliate.
         In the event that such Contractor does not effect such a transfer or
         provide such a guarantee within such time period, the Affiliate may
         terminate such Contractor's rights and interests under        
         this Agreement. Upon such termination, the defaulting Contractor's
         Participation in each Field or Exploration Activity shall be
         automatically transferred to the non-defaulting Contractors, on a pro
         rata basis, in accordance with the respective Participations of the
         non-defaulting Contractors in each Field.

20.4     Any Contractor may at any time following the satisfaction of the
         Minimum Work Obligation give notice to the Affiliate and the other
         Contractors that it wishes to withdraw from this Agreement, either
         entirely or only as to a particular Field or Exploration Activity.
         Within thirty (30) days of receipt of such notice, any of the other
         Contractors may similarly give notice that it wishes to withdraw from
         this Agreement, either entirely or as to such Field or Exploration
         Activity. If all such other Contractors give such notice, this
         Agreement shall be terminated either in its entirety or as to the
         particular Field(s) or Exploration Activity concerned, effective at
         the expiration of such 30-day period, and the Contractors shall
         abandon all relevant operations pursuant to Clause XXI. If less than
         all of the other Contractors give such notice, the withdrawing
         Contractors shall withdraw from this Agreement, either entirely or
         only as to the particular Field or Exploration Activity concerned, on
         the earliest practicable date and shall assign their respective
         Participations to the non-withdrawing Contractors, on the basis of
         their respective Participations. With respect to this Clause 20.4:



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                                                                   BOQUERON AREA

         (i)      A withdrawing Contractor shall not be allowed to withdraw
                  from this Agreement if its interest hereunder or any
                  Participation is subject to any liens, charges or
                  encumbrances, unless the remaining Parties are willing to
                  accept the assignment subject to such liens, charges or
                  encumbrances;

         (ii)     A withdrawing Contractor shall remain liable and obligated
                  for its pro-rata share of all obligations incurred prior to
                  the date of withdrawal, even if the applicable operations are
                  to be implemented after the date of withdrawal, and for any
                  acts, occurrences or circumstances taking place or existing
                  prior to its withdrawal;

         (iii)    The withdrawal of the Operator or its Associated Entity may
                  only become effective upon the appointment of a replacement
                  Operator meeting the requirements of Clause X; and

         (iv)     The withdrawing Contractor shall remain liable for its
                  pro-rata share of the cost of abandonment in accordance with
                  Clause XXI and of any Post-Takeover Date Environmental Claim
                  and Cleanup Liability in accordance with Clause XXII.

                                     XXI

                          ABANDONMENT; INACTIVE WELLS

21.1     During the term of this Agreement, whenever any Contractor Well ceases
         to be capable of commercial production or to be useful for exploration
         or appraisal in the Area and there is no reasonable likelihood that
         such Contractor Well will again be capable of commercial production or
         useful for exploration or appraisal, the Contractors shall cause the
         Operator to plug such Contractor Well and remove from the relevant
         property as promptly as practicable any related facilities, equipment
         and other assets that the Contractors have used in providing the
         Operating Services, unless the Affiliate otherwise agrees. If the
         Operator proposes to plug any Contractor Well and remove any related
         facilities, equipment and other assets, the Operator shall prepare and
         deliver to the Affiliate, no later than 30 days prior to the proposed
         commencement of the relevant operations, a report as to the
         abandonment of such Contractor Well, including the costs of such
         abandonment. In the event that the Affiliate disputes whether such
         Contractor Well is capable of commercial production or useful for
         further exploration or appraisal, the Operator shall not plug such
         Contractor Well or remove such facilities, equipment and other assets,
         pending the resolution of the dispute. The Affiliate shall have the
         right to require a review of any such report by an independent expert
         appointed pursuant to Clause 23.3, and the determination by the expert
         as to whether the standards for abandonment of such Contractor Well are
         satisfied shall be final and binding.

         Similarly, if the Affiliate believes that a Contractor Well has ceased
         to be capable of commercial production or to be useful for exploration
         or appraisal in the Area, it may give notice to the Operator to this
         effect, and the Operator shall respond within 30 days of such notice
         either agreeing to plug and abandon such Contractor Well or stating
         the reasons that lead it to believe that there is a reasonable
         likelihood that such Contractor Well will again be capable of

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                                                                   BOQUERON AREA

         commercial production or useful for exploration or appraisal. If the
         Affiliate does not accept such reasons, it shall have the right to
         require a review by an independent expert appointed pursuant to Clause
         23.3, and the determination by the expert as to whether the standards
         for abandonment of such Contractor Well are satisfied shall be final
         and binding. If the independent expert upholds the Affiliate's
         position, the Contractors shall promptly plug and abandon the
         Contractor Well(s) concerned.

         At least twenty-four (24) months prior to the end of the Operation
         Period with respect to each Field (or, in the case of an early
         termination of this Agreement pursuant to Clause XX, as soon as
         practicable after the Contractors become aware of such termination),
         the Contractors shall cause the Operator to prepare and deliver to the
         Affiliate a report listing the Contractor Wells in the Field(s)
         concerned that the Contractors are not planning to plug and abandon,
         the Contractor Wells that the Contractors are planning to plug and
         abandon, and the assets that the Contractors propose to remove, as well
         as a plan for the orderly transfer of operations to the Affiliate.

21.2     Plugging of wells and removal of equipment, facilities and other
         assets shall be undertaken by the Contractors in accordance with
         applicable Venezuelan laws and regulations and, to the extent
         consistent therewith, in accordance with International Oil Industry
         Standards.

21.3     In the event that the Operator delivers to the Affiliate a report
         indicating that it plans to plug and abandon any well (including an
         exploratory or appraisal well outside an existing Field Boundary), the
         Affiliate may, within 30 days after receipt of such report (48 hours
         if a rig is standing by, unless the Affiliate agrees within such 48
         hours to assume the stand-by costs of such rig until either it gives
         notice to the Contractors or such 30 days expire), notify the Operator
         that the Affiliate will assume responsibility for such well. In such
         event:

         (i)    the Operator shall not plug and abandon such well, and the
                Affiliate shall assume responsibility for such well;

         (ii)   neither the Operator nor any of the Contractors shall have any
                liability for any costs, expenses or damages arising out of or
                based upon the improper use or plugging and abandoning of such
                well, and the Affiliate shall indemnify the Operator and the
                Contractors from, and hold each of them harmless against, any
                costs, expenses (including without limitation reasonable legal
                costs, expenses and attorneys' fees), damages and liabilities
                incident to claims, demands or causes of action of every kind
                and character brought by or on behalf of any Person, for damage
                to or loss of property or the environment, or for injury to,
                illness or death of any Person, in each case to the extent such
                costs, expenses, damages and liabilities arise from or are
                based upon the improper use or plugging and abandoning of such
                well by the Affiliate; and

         (iii)  the Affiliate may plug and abandon such well or retain such
                well for possible future use for production or otherwise,
                except that the Affiliate may not during the Operation Period
                (or during the term of this Agreement with respect to the


                                       55


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                                                                  BOQUERON AREA


                 relevant portion of the Area, in the case of a well drilled
                 outside the Field Boundary of a Field) use such well to drill
                 to a target zone within the Area;

         provided that, in the case of an exploratory or appraisal well as to
         which the inclusion of the related Well Expenditures in the
         calculation or the Service Fee for a potential new Field is uncertain,
         the Affiliate will have the option to assume responsibility for such
         well as provided above only if, within 30 days following receipt of
         the report indicating the Operator's intention to plug and abandon
         such well, it agrees with the Operator on appropriate compensation for
         such well in the event that such Well Expenditures are in fact never
         included in the calculation or the Service Fee; provided that, if a
         rig is standing by, the Affiliate will have only 48 hours to reach
         such agreement, unless it undertakes within such 48 hours to assume
         the stand-by costs of such rig until either it reaches such agreement
         with the Contractors or such 30 days expire).

21.4     The Contractors shall have the following rights and obligations with
         respect to any inactive well in the Area that was not abandoned prior
         to the Takeover Date:

         (a) At any time until the later of (1) the Takeover Date and (2) 6
         months following the Effective Date, the Contractors shall have the
         right to enter, reactivate and use any such inactive well free of
         charge, subject to compliance with the following procedures:

         (i)     before first entering the well, the Contractors must receive
                 approval from the Affiliate of a plan for an integrity test to
                 determine the mechanical condition and environmental and
                 safety considerations relating to such well and any related
                 facilities;

         (ii)    upon approval by the Affiliate of such integrity test, the
                 Contractors may conduct the integrity test and, if one is
                 conducted, shall promptly report the results to the Affiliate,
                 stating (1) whether they choose to exercise the right to
                 reactivate such well for production or otherwise at that time,
                 (2) whether they have discovered any conditions presenting a
                 material risk to health and safety or to the condition of the
                 environment, and (3) an estimate of the costs of correcting
                 any such conditions if the Contractors were to undertake
                 remedial actions;

         (iii)   if, upon the completion of the integrity test, the Contractors
                 choose not to exercise the right to use such well, the
                 Contractors shall have no further rights or obligation with
                 respect to such well except as provided in Clause 21.4(b)
                 below; and

         (iv)    if, upon the completion of the integrity test, the Contractors
                 choose to exercise the right to use such well, such well shall
                 thereafter be a Contractor Well, the Contractors shall
                 thereafter assume all responsibility for such well, and the
                 Affiliate shall have no liability for any costs, expenses or
                 damages arising out of or based upon the improper drilling or
                 use of such well (whether prior to or after the date such well
                 is taken over by the Contractors).



                                     56
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                                                                 BOQUERON AREA

     Any inactive well as to which the Contractors do not exercise the option
     provided by this Clause 21.4(a) within the time period provided above may
     thereafter be used by the Contractors only with the approval of the
     Affiliate, and subject to such terms as the Affiliate may decide, in its
     discretion.

     (b)(1) The Contractors shall in any event inspect all inactive wells in
     accordance with (i) the procedures and schedule set forth in the relevant
     Development Plan in the case of inactive wells inside the Field covered by
     such Development Plan and (ii) procedures and a schedule requested by the
     Affiliate in the case of inactive wells outside any Field (which schedule
     shall provide for inspection no more frequently than every 6 months). The
     Contractors shall report to the Affiliate any conditions presenting a
     material risk to health and safety or to the condition of the environment,
     indicating the likely cause of such conditions and an estimate of the costs
     of correcting any such conditions if the Contractors were to undertake
     remedial actions. The reasonable costs of inspecting such inactive wells
     shall be separately reimbursed by the Affiliate outside the Service Fee.

     (2) If such conditions result in whole or in part from the Operator's
     actions in the Area (e.g., the repressurization of a reservoir), the
     Contractors shall cause the Operator to promptly undertake appropriate
     measures including, if necessary, plugging and abandoning the well(s)
     concerned. The cost of such measures shall be Chargeable Expenditures (to
     the extent they otherwise qualify as such) for the Field that caused such
     condition.

     (3) If such conditions do not result in whole or in part from the
     Operator's actions in the Area, the Affiliate shall promptly notify the
     Contractors as to whether the Affiliate wishes to take measures to correct
     such conditions, or whether the Contractors should do so. If the Affiliate
     states that it wishes to take such measures, it shall promptly do so at its
     own cost and expense. If the Affiliate states that the Contractors should
     take such measures, the Contractors shall do so, and the Affiliate shall
     promptly reimburse the Contractors outside the Service Fee for all
     reasonable costs and expenses incurred by the Contractors in the course of
     taking such measures.

     (4) If there is a disagreement as to either the cause of any such
     conditions or the need to take corrective measures, the Affiliate or the
     Operator may refer the matter to an independent expert pursuant to Clause
     23.3, whose decision as to the cause of such conditions or the need to take
     such measures, as the case may be, shall be final and binding.

     (c) Except as specifically provided in this Clause 21.4, the Contractors
     shall have no liability or obligation with respect to any such inactive
     wells.



                                      57


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                                    XXII

                             ENVIRONMENTAL MATTERS

22.1     The Contractors shall establish, or cause the Operator to establish,
         an environmental protection program in connection with all operations
         undertaken in connection with the Operating Services with a view to
         ensuring that all such operations are conducted in accordance with
         Environmental Law. Each Development Plan and plan for an Exploration
         Activity shall contain such an environmental program for the
         applicable activities, including:

         (i)     emergency and contingency plans to attend to any crude oil
                 spills or other Releases;

         (ii)    a plan for protecting the environment, specifying the steps to
                 be taken for handling Releases and Hazardous Substances;

         (iii)   a plan for training all personnel who will be involved in
                 implementing such environmental program; and

         (iv)    a program for preventing injuries and/or industrial diseases.

22.2     (a) The Contractors and Operator shall have no liability for any
         Pre-Takeover Date Environmental Claim and Cleanup Liability, and the
         Affiliate shall indemnify and hold harmless the Contractors and the
         Operator against any Pre-Takeover Date Environmental Claim and Cleanup
         Liability. In the event that the Contractors or Operator are
         threatened with, or believe they may be liable for, any Pre-Takeover
         Date Environmental Claim and Cleanup Liability, they shall promptly
         notify the Affiliate and follow the Affiliate's instructions with
         respect to such Pre-Takeover Date Environmental Claim and Cleanup
         Liability. The Affiliate will promptly reimburse the Contractors and
         Operator for any Pre-Takeover Date Environmental Claim and Cleanup
         Liability that they may suffer or incur.

         (b) Neither the Affiliate nor any of its Associated Entities shall
         have any liability for any Post-Takeover Date Environmental Claim and
         Cleanup Liability, and the Contractors and Operator shall indemnify
         and hold harmless the Affiliate and its Associated Entities against
         any Post-Takeover Date Environmental Claim and Cleanup Liability. In
         the event that the Affiliate or its Associated Entities are threatened
         with, or believe they may be liable for, any Post-Takeover Date
         Environmental Claim and Cleanup Liability, they shall promptly notify
         the Operator and follow the Operator's instructions with respect to
         such Post-Takeover Date Environmental Claim and Cleanup Liability. The
         Contractors will promptly reimburse the Affiliate or its Associated
         Entities for any Post-Takeover Date Environmental Claim and Cleanup
         Liability that they may suffer or incur.

         (c) The Affiliate makes no representation or warranty, express or
         implied, with respect to environmental conditions in the Area or the
         compliance of conditions in the Area or operations as currently
         conducted with Environmental Law and, except as specifically provided
         in this Clause XXII, shall have no liability to the Contractors, the
         Operator or any of their respective

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         subcontractors, officers, directors, employees or agents with respect
         to or arising out of any such environmental conditions or
         non-compliance.

22.3     Following the Effective Date, the Contractors shall prepare or cause
         to be prepared an environmental audit in conformity with Environmental
         Law, in order to assess the environmental conditions existing in the
         Initial Field and the rest of the Area. Such audit shall not
         constitute conclusive evidence of the environmental problems or
         conditions existing as of the Takeover Date and shall not preclude the
         Contractors from demonstrating that a subsequent Environmental Claim
         and Cleanup Liability constitutes a Pre-Takeover Date Environmental
         Claim and Cleanup Liability.

         Prior to commencing such audit, the Contractors shall present for the
         Affiliate's approval a plan for such audit indicating:

         i)      the scope and content of such audit; and

         ii)     any Person or Persons, other than the Operator, that will
                 conduct the audit on behalf of the Contractors and the method
                 of selection of such Persons.

         Such audit shall be completed, and the results reported to the
         Affiliate, no later than six months following the Effective Date.

22.4     At the end of the Operation Period with respect to each Field (and
         upon termination of the Agreement with respect to other areas), the
         Contractors shall prepare or cause to be prepared an environmental
         audit on a basis substantially consistent with the audit prepared
         pursuant to Clause 22.3, except to the extent that Environmental Law
         or relevant industry practices change. Such audit shall be prepared
         during the last twelve months of the Operation Period (or term of the
         Agreement) and shall be delivered on or prior to the last day of the
         Operation Period (or term of the Agreement), unless the Operation
         Period (or Agreement) is terminated early pursuant to Clause XX, in
         which case the audit shall be prepared as soon as possible after the
         fact of such early termination becomes known by the Contractors, and
         shall be delivered to the Affiliate as soon as practicable after
         completion. Such audit shall not constitute conclusive evidence of the
         environmental problems or conditions existing as of such termination
         and shall not preclude the Affiliate from demonstrating that an
         Environmental Claim and Cleanup Liability constitutes a Post-Takeover
         Date Environmental Claim and Cleanup Liability.

22.5     In the event that the Contractors are at any time required to cease or
         curtail Baseline Production as a result of a condition, circumstance
         or production practice which exists as of the Takeover Date and which
         at such time violates Environmental Law, the Baseline Production for
         the Hydrocarbons concerned will immediately and permanently be
         reduced by the amount of such curtailment, unless (i) the Affiliate
         agrees within 30 days of such cessation or curtailment to pay for any
         measures or facilities that are needed so that the original Baseline
         Production will be in compliance with the relevant laws and
         regulations, and (ii) throughout the period of such curtailment, the
         Affiliate calculates and pays the portion or the Service Fee related
         to Baseline Production as if the Baseline Production were being
         produced in full. In this case, for purposes of Article 5.2.3 of the
         Accounting Procedures, the Baseline Production will be deemed to have
         been delivered in full. The expenses of implementing such measures or



                                       59
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                                                                 BOQUERON AREA

         constructing such facilities will be paid or reimbursed directly by
         the Affiliate and will not be included in the calculation of the
         Service Fee. The Contractors' actual knowledge of any such condition,
         circumstance or production practice prior to the Takeover Date shall
         not operate as a waiver of the Contractors' rights, or otherwise
         affect the Affiliate's obligations, under this Clause 22.5.

                                     XXIII

                   GOVERNING LAW; ARBITRATION; EXPERT OPINION

23.1     This Agreement shall be governed by and construed in accordance with
         the laws of the Republic of Venezuela.

23.2     (a)     Any dispute arising out of or concerning this Agreement shall
                 be settled exclusively and finally by arbitration. The
                 arbitration shall be conducted and finally settled by three
                 (3) arbitrators in accordance with the Rules of Conciliation
                 and Arbitration of the International Chamber of Commerce (the
                 "ICC Rules"), or such other rules as may be agreed by all of
                 the Parties involved. If the Affiliate is a party to the
                 relevant dispute, the Affiliate shall select an arbitrator and
                 the other party or parties thereto shall collectively select
                 an arbitrator in accordance with the ICC Rules. If the
                 Affiliate is not a party to the relevant dispute, and there
                 are only two such parties, each such party shall select an
                 arbitrator in accordance with the ICC Rules. In either such
                 case, the arbitrators so nominated shall then agree within
                 thirty (30) days on a third arbitrator to serve as Chairman.
                 If the Affiliate is not a party to the relevant dispute, and
                 there are more than two such parties, then all three
                 arbitrators, including the Chairman, shall be selected by the
                 International Court of Arbitration of the International
                 Chamber of Commerce in accordance with the ICC Rules, as if
                 all parties had failed to nominate arbitrators. All
                 arbitration proceedings under this Agreement shall be
                 conducted in New York City (United States of America). Any
                 decision or award of the arbitral tribunal (or the arbitrator)
                 shall be final and binding upon the Parties. Judgment for
                 execution of any award rendered by the arbitral tribunal (or
                 the arbitrator) may be entered by any court of competent
                 jurisdiction without review of the merits of such award. To
                 the extent permitted by law, any rights to appeal from or to
                 cause a review of any such award by any court or tribunal are
                 hereby waived by the Parties.

         (b)     To the extent that the Affiliate has or hereafter may acquire
                 any immunity from jurisdiction of any court or from attachment
                 in aid of execution of any other legal process (other than
                 pre-judgment attachment) in any action or proceeding conducted
                 pursuant to this Clause 23.2 (including any proceeding for the
                 enforcement of an arbitral judgment) with respect to itself or
                 its assets, the Affiliate hereby irrevocably agrees not to
                 invoke such immunity as a defense, and irrevocably waives such
                 immunity.

23.3     (a)     Whenever a matter is required to be determined by an expert
                 pursuant to any provision of this Agreement, the expert shall
                 be a reputable individual possessing expert knowledge



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              and experience for the determination of the matter in question and
              shall be independent of the Parties. The expert shall be appointed
              by agreement between the parties to the dispute or, in a default
              of such agreement, within thirty (30) days after a Party has
              requested the appointment of an expert by the International Center
              of Expertise of the International Chamber of Commerce at Paris.
              Such expert shall determine the matter in question within sixty
              (60) days after his appointment on the basis of terms of reference
              agreed between the parties to the dispute or otherwise as the
              expert may himself determine as an expert and not as arbitrator,
              and such determination shall be final and binding on the Parties
              hereto, except as otherwise provided herein. All costs of such
              expert shall be borne 50% by the Affiliate and 50% by the
              Contractors.

         (b)  Any time period during which a matter is undergoing expert review
              (beginning with the giving of notice regarding such review) shall
              not count against the time period for approval by the Affiliate of
              the issue in respect of which such matter was submitted for expert
              review.

         (c)  In the event that the Affiliate rejects for the third time any
              proposed Development Plan, Annual Work Program and Budget,
              Exploration Activity or amendment to a Development Plan (as such
              proposed Development Plan, Annual Work Program and Budget,
              Exploration Activity or amendment may have been modified or
              amended by the Contractors following the determination of an
              expert pursuant to this Clause), the Contractors thereafter shall
              not be entitled to submit to expert determination any matter in
              respect of such Affiliate's third rejection, and the Affiliate's
              rejection shall be final and binding.

23.4     The approval or disapproval of any matter by the Affiliate shall not
         supersede any applicable Venezuelan law or regulation or exempt any
         Party from being subject to any such law or regulation, nor shall it
         otherwise serve to modify the Party's remaining obligations under this
         Agreement.

23.5     Without limiting the generality of Clause 23.1, the Parties hereby
         acknowledge the applicability of Article 1160 of the Venezuelan Civil
         Code to this Agreement, and that accordingly all obligations hereunder
         shall be performed in good faith, and in accordance with equity, custom
         and law. The Parties also acknowledge the applicability of any
         international treaties relating to the mutual protection of foreign
         investment to which both Venezuela and any country of which a
         Contractor, an Operator or a guarantor thereof is a national may now be
         or hereafter become parties.


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                                      XXIV


            TECHNOLOGY; OWNERSHIP OF INFORMATION AND DATA; ACCESS TO FACILITIES

24.1     To the fullest extent permitted by applicable law or agreements, the
         Contractors agree to make available on reasonable terms their most
         appropriate technical expertise and technology for use in the
         provision of the Operating Services, including such technology as can
         best improve the economic yield or performance of the Hydrocarbon
         reservoirs developed and operated by the Contractors and the Operator
         under this Agreement.

24.2     The Contractors shall also endeavor to ensure that such Venezuelan
         personnel as are employed or assigned to managerial or technical
         positions within the Contractors or the Operator receive training in
         the use of such advanced technology as the Contractors or the Operator
         employ in the provision of the Operating Services. Such training may
         also be made available to employees of the Affiliate or any of its
         Associated Entities, subject to such agreed terms and conditions as
         may best serve the mutual interests of the Parties.

24.3     Any technology specifically developed by the Contractors or the
         Operator in the course of their activities under this Agreement shall
         be owned by both the Contractors and the Affiliate, and may be used by
         any of them or their Associated Entities in their own operations
         without the consent of the other and without making any payment to the
         other. All geological, geophysical and other data, as well as all
         other information developed in the course of the activities
         contemplated by this Agreement (other than technology specifically
         developed by the Contractors) will be owned by the Affiliate, but may
         be used free of charge by the Contractors or the Operator in connection
         with the Operating Services during the term of this Agreement.

24.4     The Affiliate shall have prompt and full access to all data, records
         and information used or produced by or for the Contractors or the
         Operator in connection with the Operating Services, regardless of
         whether such data, records and information would otherwise be
         considered proprietary or confidential, and shall have the right to
         inspect or cause to be inspected any and all facilities used in the
         Operating Services during regular business hours in a manner that will
         not materially interfere with the provision of the Operating Services.
         The Affiliate shall not be entitled to use, or to permit its
         representatives or any other Person to use, any proprietary
         information of any Contractor, the Operator or any of their respective
         Associated Entities that is inspected pursuant to this Clause 24.4,
         without the prior written consent of such Contractor, the Operator or
         such Associated Entity.



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                                      XXV

                                CONFIDENTIALITY

25.1     All data, records and information referred to in Clause 24.3 and 24.4,
         and any other information exchanged between any Parties or between the
         Operator and any Party in connection with this Agreement,
         ("Confidential Information") shall be treated as confidential by the
         party receiving such information (the "Receiving Party"), and shall
         not be disclosed by it to any third party unless the party that
         provided such information, data or materials (the "Disclosing Party")
         has given its prior consent to such disclosure.

25.2     Each Receiving Party may disclose such Confidential Information to any
         of its officers, directors, employees, Associated Entities, agents,
         subcontractors and advisors who (i) has a need to know the same in
         connection with carrying out the Operating Services and (ii) has been
         advised of, and agrees to comply with, the restrictions upon such
         Confidential Information set forth in this Agreement as if it were a
         Receiving Party.

25.3     Notwithstanding the foregoing, the Receiving Party may disclose
         Confidential Information to a third party without the Disclosing
         Party's prior written consent to the extent such information:

         (i)     is already known to the Receiving Party as of the date of
                 disclosure other than as a result of a breach of this Clause
                 XXV;

         (ii)    is already in possession of the public or becomes available to
                 the public other than through the act or omission of the
                 Receiving Party;

         (iii)   is developed independently by the Receiving Party without the
                 use of any Confidential Information;

         (iv)    is acquired independently from a third party, which is under
                 no legal obligation known to the Receiving Party prohibiting
                 such disclosure; or

         (v)     is required to be disclosed pursuant to any applicable law,
                 decree, regulation, rule or order of any competent authority.

         In the event that any Receiving Party is required by applicable law,
         decree, regulation, rule or order of any competent authority to
         disclose any Confidential Information supplied to it by any Disclosing
         Party, the Receiving Party shall promptly notify in writing the
         Disclosing Party, so that the Disclosing Party may seek an appropriate
         protective order and/or waive the Receiving Party's compliance with
         the confidentiality requirement. In the event that such protective
         order or other remedy is not obtained, then the Receiving Party shall
         furnish only that portion of such Confidential Information that is
         legally required to be disclosed.

25.4     Notwithstanding the foregoing, any Contractor may disclose
         Confidential Information to any Person with whom such Contractor
         enters into bona fide negotiations for the Transfer of an



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         interest hereunder, or for the financing or insuring of any activities
         hereunder, or to their respective advisors, so long as (i) the
         Confidential Information is limited to such information as the
         potential transferee, financier, insurer or any such advisor, requires
         for purposes of evaluating the proposed transaction, and (ii) the
         potential transferee, financier, insurer or advisor, agrees in writing
         to abide by confidentiality restrictions identical to those set forth
         in this Clause XXV.

25.5     All press releases, advertisements and other announcements or
         publications by the Operator, any Contractor or any of their
         Associated Entities involving information relating to this Agreement
         or the Operating Services must be approved by the Affiliate prior to
         distribution or dissemination, except to the extent such announcements
         relate to emergency situations and are reasonably necessary for the
         protection of the environment or health or safety.


                                      XXVI

                                 FORCE MAJEURE

26.1     Failure of a Party to fulfill any obligation incurred under this
         Agreement shall be excused and shall not be considered a default
         hereunder during the time and to the extent that such noncompliance is
         caused by an Event of Force Majeure, except that if the Event of Force
         Majeure is an act of the Venezuelan State that is not of general
         applicability, such Event of Force Majeure shall not preclude an
         action for damages against the Affiliate for the non-performance of
         the relevant obligation.

26.2     For the purposes of this Agreement, an "Event of Force Majeure" shall
         mean any event or circumstance, other than lack of finances, beyond
         the reasonable control of and unforeseeable by the Party obligated to
         perform the relevant obligation, or which, if foreseeable, could not
         be avoided in whole or in part by the exercise of due diligence,
         including but not limited to strikes, boycotts, stoppages, lockouts
         and other labor or employment difficulties, fires, earthquakes,
         tremor, landslides, avalanches, floods, hurricanes, tornadoes, storms,
         other natural phenomena or calamities, explosions, epidemics, wars
         (declared or undeclared), hostilities, guerrilla activities, terrorist
         acts, riots, insurrections, civil disturbance, acts of sabotage,
         blockades, embargoes, or acts of state or any governmental body.

26.3     If any Party cannot comply with any obligation stipulated herein
         because of an Event of Force Majeure, such Party shall notify the
         other Parties in writing as promptly as possible giving the reason for
         non-compliance, particulars of the Event of Force Majeure and the
         obligation or condition affected. Except as provided in Clause 26.1,
         any obligation of a Party shall be temporarily suspended during the
         period in which such Party is unable to perform by reason of an Event
         of Force Majeure, but only to the extent of such inability to perform.
         The obligations of the Parties to perform as provided by this
         Agreement through facilities not affected by the Event of Force
         Majeure shall continue. The Party affected by the Event of Force
         Majeure shall promptly notify the other Parties as soon as such event
         has been removed and no longer



                                       64
   68
                                                                   BOQUERON AREA


         prevents it from complying with its obligation, and shall thereafter
         resume compliance with the Agreement.

26.4     The Party which has given notice of an Event of Force Majeure shall
         endeavor to mitigate the effects of such Event of Force Majeure on the
         performance of its obligations. Where an Event of Force Majeure
         continues for more than sixty (60) days, the Parties shall meet to
         review the situation and its implications for operations and to
         discuss the appropriate course of action in the circumstances.

26.5     If an Event of Force Majeure occurs that substantially impedes
         development or exploitation activities, the relevant Operation Period
         will be extended by an amount of time equal to the period during which
         such event is in effect. In each case, such extension will be only
         with respect to any affected Field. If the Operation Period is
         extended pursuant to this Clause 26.5, the Affiliate shall not be
         entitled to draw on any letter of credit or guarantee delivered by a
         Contractor pursuant to Clause 4.4 until the end of the period set
         forth in Clause 4.3, plus a time period equal to the duration of any
         extension, but only if such Contractor provides a replacement of or
         amendment to such letter of credit or guarantee, in form and substance
         satisfactory to the Affiliate, ensuring that the Affiliate's rights at
         the end of such period will be the same as the rights it would have
         enjoyed at the end of the original period had no such extension
         occurred.


                                     XXVII

                         ASSIGNMENT; CHANGE IN CONTROL

27.1     No Contractor may effect a Transfer without the prior consent of the
         Affiliate. Such consent may be granted or withheld at the Affiliate's
         discretion (i) before the Minimum Work Obligation is satisfied in
         full, and (ii) if the proposed Transfer would result in a Person
         holding a Participation of less than 9% in any Field. In addition, no
         Transfer can be made that would result in non-compliance with Clause
         10.3. At least 30 days prior to any proposed Transfer, the Contractor
         shall provide notice to the Affiliate of the Transfer, including the
         name of the proposed transferee and the Participations in each Field
         to be transferred. Notwithstanding the foregoing, (i) any Contractor
         whose obligations are guaranteed pursuant to Clause 3.2 may effect a
         Transfer to any Associated Entity of the guarantor, upon confirmation
         by the guarantor in form and substance satisfactory to the Affiliate
         that the applicable guarantee remains in effect as to the obligations
         of the transferee, and (ii) any other Contractor may effect a Transfer
         to any Associated Entity of such Contractor, upon execution by the
         Contractor of a guarantee substantially in the form of Annex D hereto
         with respect to the obligations of such Associated Entity.

27.2     For purposes of Clause 27.1, if any Contractor's obligations are
         guaranteed pursuant to Clause 3.2, any proposed transaction that, if
         consummated, would result in the guarantor ceasing to be an
         Associated Entity of such Contractor shall be considered a Transfer,
         subject to the Affiliate's right of consent pursuant to Clause 27.1



                                       65
   69
                                                                   BOQUERON AREA


27.3     The Affiliate may not effect a Transfer without the prior consent of
         the Contractors. Notwithstanding the foregoing, no consent shall be
         required for the Transfer by the Affiliate in whole or in part of its
         rights or obligations hereunder to PDVSA or any Associated Entity of
         PDVSA.

27.4     Upon the consummation of any Transfer by a Contractor, the transferee
         shall be considered for all purposes a Contractor, with the
         Participation in each Field specified in the notice delivered to the
         Affiliate pursuant to Clause 27.1. Upon the consummation of any
         Transfer by the Affiliate, the transferee shall be considered the
         "Affiliate" for all purposes hereunder.

27.5     Any purported Transfer by a Contractor or by the Affiliate that does
         not comply with this Clause XXVII shall be null and void and shall
         vest no rights in the purported transferee.

27.6     Nothing in this Clause XXVII shall prohibit the Operator from
         subcontracting all or any portion of the activities involved in the
         Operating Services in compliance with the terms of this Agreement. The
         Operator shall be fully responsible for the performance of its
         obligations hereunder, notwithstanding any such subcontracting
         arrangement (although the Operator may agree with any subcontractor on
         indemnity arrangements satisfactory to the Operator and such
         subcontractor).


                                     XXVIII

                                    NOTICES

28.1     All notices, demands, instructions, waivers, consents or other
         communications to be provided pursuant to this Agreement shall be in
         writing in Spanish, shall be effective upon receipt, and shall be sent
         by personal delivery, courier, facsimile or telex, to the following
         addresses:

         (i)     If to the Contractors, to:

                 UNION TEXAS VENEZUELA LIMITED

                 1330 Post Oak Blvd

                 Houston, Texas 77056

                 Attn.: Newton W. Wilson, III, President

                 Telephone: (713) 968-2808

                 Facsimile: (713) 968-2815



                                       66
   70
                                                                   BOQUERON AREA


                 PREUSSAG ENERGIE GmbH

                 Waldstrasse 39

                 D49809 Lingen

                 Germany

                 Attn: Heinz-Georg Feuerborn, General Counsel

                 Telephone: 49-591-612-202

                 Facsimile: 49-591-6127-000


         (ii)    If to the Affiliate, to:

                 LAGOVEN, S.A.

                 Edificio Lagoven

                 Av. Leonardo Da Vinci, Los Chaguaramos

                 Caracas 1010-A, Venezuela

                 Production Department, Piso 8

                 Attn: Roland Glaenztlin

                 Telephone: 58-2-606-4585 / 58-2-606-5502

                 Facsimile: 58-2-606-4426 / 58-2-606-3371

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Agreement may be changed by means of a notice given
         to all Parties at least fifteen (15) Business Days prior to the
         effective date of such change.


                                       67
   71
                                                                   BOQUERON AREA


                                      XXIX

                                 MISCELLANEOUS


29.1     To be binding, any amendment of this Agreement must be effected by an
         instrument in writing signed by all of the Parties. No further
         formalities by the Parties shall be required to amend this Agreement.

29.2     Rights hereunder may not be waived, except pursuant to a writing
         signed by the Party against which enforcement of the waiver is sought.

29.3     Notwithstanding anything to the contrary contained in this Agreement,
         in no event shall any Party be liable to any other Party for any
         consequential damages or lost profits that such other Party may
         suffer.  The Parties acknowledge that this Clause is intended only to
         limit their liability to each other for consequential loss or damage,
         and shall not be construed so as to limit their liability to third
         parties or their right to seek indemnification for third party claims
         in accordance with any other Clause.

29.4     Nothing contained herein is intended to create, or shall be deemed or
         construed as creating, any legal entity between the Parties. No Party
         shall have the authority or right, or hold itself out as having the
         authority or right, to assume, create or undertake any obligation of
         any kind whatsoever, express or implied, on behalf of or in the name
         of any other Party, except as expressly provided herein. Except to the
         extent that the Contractors are to acquire goods and services from
         third parties for the account of the Affiliate on a non-recourse basis
         as provided herein, no provision in this Agreement shall constitute
         the Contractors or the Operator, or any of their employees,
         subcontractors, agents or representatives, an employee, contractor,
         agent or representative of the Affiliate. The Contractors and the 
         Operator shall be independent contractors and shall be responsible for
         and have control over the performance of the Operating Services        
         hereunder, subject to the standards set forth in this Agreement. Any
         provision herein giving the Affiliate the right to direct the
         Contractors or the Operator as to any details of the performance of
         the Operating Services shall not be construed to limit or release the
         obligations of the Contractors or the Operator hereunder.

29.5     The obligations of the Contractors and the Operator hereunder shall be
         several and not joint, except that the Operator shall be jointly and
         severally liable for the obligations of the Contractors as provided in
         Clause 10.1.

29.6     This Agreement my be executed in one or more counterparts, each of
         which shall be considered an original.

29.7     This Agreement is being executed in the Spanish language, and an
         English language version is being acknowledged as an official
         translation. The Spanish version shall constitute the only binding
         version, and the English translation is being acknowledged as a matter
         of reference only.



                                       68
   72
                                                                   BOQUERON AREA


                                   SIGNATURES

         In Caracas, Venezuela, on the 29 day of the month of July, 1997.

         ACKNOWLEDGED AS OFFICIAL TRANSLATION

         LAGOVEN S.A


         By:

         /s/ JULIUS TRINKUNAS       
         ---------------------------
         Name: Julius Trinkunas            [SEAL]

         Title: President




         UNION TEXAS VENEZUELA LIMITED


         By:     /s/ NEWTON W. WILSON, III  
                 ---------------------------
         Name:   Newton W. Wilson, III

         Title: President




         PREUSSAG ENERGIE GmbH


         By:     /s/ RUDOLPH BERENDS        
                 ---------------------------
         Name:   Rudolph Berends

         Title: Attorney in Fact



                                       69
   73
                                     ANNEX A
                               DESCRIPTION OF AREA
                                  BOQUERON AREA

  1.  LOCATION

      The Area is comprised of sixty square kilometers (60 km(2)) and is located
      four kilometers (4 km) northeast of the city of Maturin, in the Boqueron
      field.

  2.  MAP
     
      [See attached map.]

  3.  STRATIGRAPHIC REFERENCE COLUMN

      The following stratigraphic column shall be the official reference for
      Annexes A and B.

          AGE                        FORMATION              MEMBER
          ---                        ---------              ------   

          MIOCENE                    CARAPITA

          OLIGOCENE                  NARICUAL             NARICUAL SUPERIOR
                                                          NARICUAL MEDIO
                                                          NARICUAL INFERIOR
                                     AREO

          CRETACEOUS                 LOS JABILLOS

  4.  AREA BOUNDARY

      Horizontally the Area boundary is represented by a polygon of four (4)
      vertices, the geographic coordinates of which are indicated in the map
      included herein.

      Vertically the Area comprises the entire stratigraphic column, without
      limit of depth.




                                      A-1
   74





                                     ANNEX B
                          DESCRIPTION OF INITIAL FIELD
                                  BOQUERON AREA

1.    MAP

      [See attached map.]

2.    FIELD BOUNDARY Of THE INITIAL FIELD

      Aerially the Field Boundary of the Initial Field is comprised of a
      polygon of eight (8) vertices, the geographic coordinates of which are
      indicated in the map included herein.

      Vertically the Field Boundary of the Initial Field is comprised of the
      base of the Carapita Formation of the Miocene Age and the top of the Areo
      Formation of the Oligocene Age.




                                      B-1
   75





  ANNEX C

  [Translation]

  



                             ACCOUNTING PROCEDURES





   76





                              ACCOUNTING PROCEDURES

I.       GENERAL CONDITIONS

1.1      Purposes

         The purposes of these Accounting Procedures are to establish the
         accounting procedures that will allow the maintenance of all the
         necessary records to reflect in a consistent manner the costs of
         exploiting Hydrocarbons in the Area, to facilitate the payment of
         Service Fees and to permit the Parties to comply with their other
         obligations and responsibilities under the Agreement.

1.2      Definitions(1)

         Capitalized terms defined in the Agreement (as defined below), when
         used in these Accounting Procedures, have the respective meanings
         assigned to such terms in the Agreement. The following definitions are
         in addition to and supplement those set forth in the Agreement.

                  "Agreement" means the Operating Agreement of which these
                  Accounting Procedures form a part.

                  "Bolivar Exchange Rate" means, as of any date of determination
                  in any calendar month, the average of the daily closing
                  exchange rates for each day in such calendar month on which
                  the relevant rate is fixed, for the purchase of Bolivars with
                  Dollars, determined for each such day in accordance with
                  Venezuelan laws and regulations for use in a transaction of
                  the type being recorded or booked. If at any time there is 
                  more than one legal rate for purchase of Bolivars with Dollars
                  with respect to the relevant type of transaction, the rate to
                  be used shall be the rate that most nearly reflects the free
                  market rate for such conversion. In the event that there is a
                  dispute as to which rate satisfies such requirement, pending
                  the resolution of the dispute, the Bolivar Exchange Rate for
                  any such day shall be equal to the rate at which the Operator
                  actually purchased Bolivars with Dollars, in its most recent
                  bona fide arms' length transaction of at least $10,000, from
                  Persons other than the Operator, a Contractor or an Associated
                  Entity of the Operator or a Contractor.

                  "Calendar Year" means the period of time from and including
                  January 1 in any year through and including December 31 in the
                  same year.

- ---------------------------
(1)  Definitions in this English translation are presented in alphabetical order
     in English for ease of reference. Accordingly, the order of these
     definitions does not match the order in the definitive Spanish version.



   77





                  "Capital Expenditures" means those Chargeable Expenditures or
                  proposed Chargeable Expenditures that are or would be
                  classified as capital expenses (including capitalized lease
                  expenses) in accordance with PDVSA Accounting Principles.

                  "Cash Method" means that method of accounting in which all
                  revenue and expenditure items are recorded as of the date on
                  which cash or other consideration is actually paid or received
                  by the relevant party.

                  "Chargeable Expenditures" means expenditures that are eligible
                  for inclusion in the calculation of the Service Fee in
                  accordance with Article IV of these Accounting Procedures.
                  Chargeable Expenditures will not include any Financing
                  Charges.

                  "CPI" means the Consumer Price Index for All Urban Consumers
                  (CPI-U), United States City Average (base period 1982-1984 =
                  100), as published by the United States Bureau of Labor
                  Statistics. In the event that such index is no longer
                  published or is no longer representative of the changes in
                  consumer prices in the United States, the Parties shall select
                  an alternative index that most accurately reflects changes in
                  consumer prices in the United States. In the absence of
                  agreement, either Party may require that the determination be
                  made by an independent expert appointed pursuant to Clause
                  23.3 of the Agreement.

                  "Expenditure Reductions" means any reduction in, or refund or
                  reimbursement of, any Chargeable Expenditures that are
                  received by the Operator or any Contractor after such
                  Chargeable Expenditures have been included in the calculation
                  of the Service Fee, including, without limitation, (i) any
                  refunds, discounts (other than discounts deducted from the
                  original purchase price), rebates; damages or other amounts 
                  received following the purchase or leasing of goods or
                  services, (ii) any amounts received as damages from, or in
                  settlement of, a legal proceeding (including an arbitration
                  proceeding), and (iii) any insurance proceeds in respect of
                  loss or damage.

                  "Exploration Expenditures" means all Chargeable Expenditures
                  made or proposed to be made in connection with an approved
                  Exploration Activity, Exploration Expenditures will not be
                  included in the calculation of the Service Fee for any Field,
                  except as provided in Clause 17.3 of the Agreement and Article
                  5.4 of these Accounting Procedures.

                  "Financing Charges" means all interest, fees and other
                  financing expenses for indebtedness (including all obligations
                  for borrowed money, all obligations evidenced by bonds, notes,
                  debentures or similar instruments, all letters of credit or
                  banker's acceptances, all delinquent tax liabilities, and all
                  obligations for the deferred purchase price of goods or
                  services, including any lease accounted for as a capitalized
                  lease, in all cases determined on the basis of international
                  accounting standards), If (i) the documentation for any such
                  indebtedness does not clearly


                                       2
   78





                  state an interest and financing component or the Affiliate
                  does not believe that the interest and financing component
                  stated in such documentation reflects a bona fide, arms'
                  length and reasonable interest and financing component and
                  (ii) the Affiliate and the Contractors are unable to agree on
                  an appropriate interest and financing component, the Affiliate
                  may at any time prior to the end of the period that may be
                  covered by an additional audit under Article 3.2 of these
                  Accounting Procedures, request that the question of an
                  appropriate interest and financing component be decided by an
                  independent expert in accordance with Clause 23.3. of the
                  Agreement. The decision of the independent expert will be
                  final and binding.

                  "Net Hydrocarbon Value" means, with respect to any Field, for
                  any Quarter, the value of the Incremental Production from such
                  field that is delivered in such Quarter at the applicable
                  Delivery Point(s) (after taking into account any reduction
                  pursuant to Article 5.2.3 of these Accounting Procedures),
                  based on the Price Formula, net of (i) Royalties in respect of
                  such Incremental Production (and in respect of any Production
                  of Liquid Hydrocarbons that is not delivered at a Delivery
                  Point and is used, disposed of or lost in a manner that
                  subjects such Production to exploitation tax (royalty) under
                  Venezuelan laws and regulations), and (ii) the percentage
                  specified in Schedule A to these Accounting Procedures of the
                  gross value of such Incremental Production based on the Price
                  Formula, in respect of the administrative costs incurred by
                  the Affiliate.

                  "Operating Expenditures" means those Chargeable Expenditures
                  or proposed Chargeable Expenditures that are or would be
                  classified as current expenses in accordance with PDVSA
                  Accounting Principles.

                  "PDVSA Accounting Principles" means the body of generally
                  accepted accounting principles used by PDVSA in the
                  preparation of its audited financial statements in Venezuela,
                  applied on a consistent basis, as such principles may be
                  amended from time to time. Promptly following the Effective
                  Date, the Affiliate shall provide the Contractors with
                  information regarding the PDVSA Accounting Principles
                  currently in effect and will thereafter consult with the
                  Contractors as requested regarding the proper classification
                  of Chargeable Expenditures for purposes of the Development
                  Plan and the first Annual Work Program and Budget for the
                  Initial Field. Any amendments to the PDVSA Accounting
                  Principles will be notified to the Contractors in a timely
                  manner. If a subsequent amendment of PDVSA Accounting
                  Principles would affect the classification of Chargeable
                  Expenditures as Operating Expenditures or Capital Expenditures
                  as reflected in the Development Plan, such classification
                  shall be revised (without need for amendment pursuant to
                  Clause IX of the Agreement) so that the classification of
                  Chargeable Expenditures therein remains consistent with the
                  classification of Chargeable Expenditures in the current and
                  future Annual Work Programs and Budgets.




                                       3
   79

                  "Quarter" means a period extending from January 1 to March 31,
                  April 1 to June 30, July 1 to September 30 or October 1 to
                  December 31 in any Calendar Year.

                  "Uniform Reporting System" shall have the meaning set forth in
                  Article 2.1.

                  "Well Expenditures" means all Chargeable Expenditures directly
                  associated with the drilling, deepening, completion,
                  recompletion, plugging back, reworking, sidetracking, testing,
                  suspension or abandonment of a well, including, without
                  limitation, site preparation, drilling charges, rental or
                  acquisition of drilling equipment, materials used in the
                  course of such activities and activities directly relating
                  thereto, logging costs, testing costs, plugging costs and
                  personnel costs in respect of the foregoing activities.

1.3    Currency

       1.3.1  Dollar Books

              All transactions relating to activities conducted in relation to
              the Agreement shall be recorded in Dollars in the books of account
              and other records maintained by the Operator.

       1.3.2  Transactions in Dollars

              The Service Fee paid by the Affiliate, Chargeable Expenditures
              made by the Operator in Dollars and Expenditure Reductions
              received by the Operator in Dollars shall be recorded at their
              actual amounts as of the date of the relevant transaction (as
              determined pursuant to Article 1.4.3).

       1.3.3  Transactions in Currencies Other Than Dollars 

              Chargeable Expenditures made by the Operator in Bolivars and
              Expenditure Reductions received by the Operator in Bolivars shall
              be translated into Dollars on the basis of the Bolivar Exchange
              Rate as of the date of the relevant transaction. The Dollar amount
              resulting from such determination shall be recorded in the books
              of the Operator as if the transaction had been originally effected
              in Dollars.

              Chargeable Expenditures incurred by the Operator in a currency
              other than Bolivars or Dollars shall be translated into Dollars
              and recorded in the books of the Operator as if such Chargeable
              Expenditures had been originally effected in Dollars, on the basis
              of either:

              (i)     if Dollars were actually used by the Operator to purchase
                      such other currency specifically for the relevant
                      transaction from a Person other than the Operator, a
                      Contractor or an Associated Entity of the Operator or a
                      Contractor, the rate at which such purchase was effected
                      (or, if there was



                                       4
   80





                      more than one such purchase, the average purchase rate,
                      weighted by the respective Dollar amounts of such
                      purchases); or

              (ii)    in all other cases, the rate at which the Operator
                      actually purchased such other currency with Dollars in its
                      most recent bona fide arms' length transaction of at least
                      $10,000 from Persons other than the Operator, a Contractor
                      or an Associated Entity of the Operator or a Contractor,
                      or if no such purchase has been made within 30 days prior
                      to the relevant transaction, the rate published in the
                      "Cross Currency Rate" table (or any successor table) in
                      the London edition of the Financial Times most recently
                      prior to the date of the transaction.

  1.4    Accounting Records

         1.4.1   The Operator shall open and maintain such separately
                 identifiable accounting records as may be necessary to record
                 in a full and proper manner the Service Fee paid by the
                 Affiliate, all Chargeable Expenditures incurred by the
                 Operator, all Expenditure Reductions, and all other amounts
                 necessary to permit compliance with these Accounting Procedures
                 and the Agreement. For purposes of these Accounting Procedures,
                 Expenditure Reductions received by a Party other than the
                 Operator shall be considered to be received by the Operator on
                 the date of receipt by such Party (and shall be remitted to the
                 Affiliate by such Party immediately upon receipt).

         1.4.2   All accounts WILL show clearly any luxury and wholesale taxes
                 (or similar Venezuelan sales or value added taxes) paid or
                 collected by the Operator for the account of the Affiliate that
                 are reimbursable to the Contractors pursuant to Article 1.6 of
                 these Accounting Procedures.

         1.4.3   All Service Fees, Chargeable Expenditures and Expenditure
                 Reductions shall be recorded in the Operator's accounting books
                 and records in accordance with the Cash Method. The Operator's
                 books and records shall be maintained in accordance with the
                 Cash Method for all purposes hereunder, except that any
                 Chargeable Expenditures that are prepaid so that they are
                 incurred in cash in a Quarter prior to that in which they are
                 due shall be deemed to have been incurred in the Quarter in
                 which they are due.

         1.4.4   The Operator shall maintain its books and records separately
                 for each Field and for all Exploration Expenditures, and
                 otherwise in order to permit the Operator to make all
                 calculations arid to prepare all reports required to be made or
                 prepared hereunder.

1.5    Inflation

         1.5.1   Except for purposes of the determination of "Deflated Pre-Tax
                 Cash Flow" and "Inflated Pre-Tax Cash Flow" in Article 5.2, and
                 except as provided in Article 1.5.2, amounts recorded in the
                 books and records of the Operator shall not be


                                       5
   81





                 adjusted for inflation and shall remain in the Operator's books
                 and records on the basis of historical amounts.

         1.5.2   For purposes of determining whether the cost thresholds set
                 forth in Sections 7.3, 7.6(ii) and 9.1 of the Agreement are
                 exceeded, Chargeable Expenditures incurred, and projections
                 made as to Chargeable Expenditures, in a Quarter other than the
                 Quarter in which the relevant determination is being made shall
                 be adjusted for inflation on the basis of the respective values
                 of the CPI most recently published as of the first day of the
                 respective Quarters for which the determination is being made,
                 so as to make such determinations on the basis of constant
                 Dollars.

         1.5.3   In order to improve the comparability of financial information,
                 the Contractors shall, to the extent reasonably practical,
                 present Development Plans and Annual Work Programs and Budgets
                 in constant Dollars.

1.6      Advances to Affiliate; Venezuelan Luxury and Wholesale Taxes

         1.6.1   All assets and services that are purchased or leased by the
                 Contractors from third parties in connection with the Operating
                 Services (including any assets or services purchased or leased
                 from an Associated Entity of any Contractor acting as a
                 supplier) shall be deemed to have been acquired for the account
                 of the Affiliate and funded through non-recourse advances from
                 the Contractors to the Affiliate, as described more fully in
                 Article VI.

         1.6.2   Accordingly, all Venezuelan luxury and wholesale taxes (or
                 similar Venezuelan value added or sales taxes) that are due in
                 connection with the purchase, sale, leasing or other
                 acquisition of any such assets or services relating to the
                 provision of Operating Services shall be deemed to have been
                 incurred and paid for the account of the Affiliate, and shall
                 be reimbursed to the Contractors by the Affiliate in Bolivars
                 monthly, against presentation of written requests for
                 reimbursement in the form specified in the Uniform Reporting
                 System. Such reimbursement shall be made within 30 days
                 following the receipt of the request for reimbursement.

         1.6.3   No Venezuelan taxes that are subject to reimbursement pursuant
                 to Article 1.6.2 may be included in the Chargeable Expenditures
                 submitted to the Affiliate for inclusion in the calculation of
                 the Service Fee, and all Chargeable Expenditures must be
                 charged net of such taxes.

  II.    REPORTS

  2.1    Uniform Reporting System

         The "Uniform Reporting System" shall consist of tile various reports,
         plans, notices, budgets, AFEs, statements, invoices and other documents
         that will be used for the collection and presentation of technical,
         financial and other information whose communication or exchange is
         contemplated by the Agreement, these Accounting Procedures or
         applicable Venezuelan Laws and Decisions. The Affiliate shall establish
         the 

                                       6
   82





         the Uniform Reporting System no later than 30 days following the
         Effective Date, after consultation with the Contractors (and the
         Operator, if it has executed the Agreement), taking into account that
         an important objective of the Uniform Reporting System is uniformity of
         reporting under the Agreement and the other operating services
         agreements entered into in connection with the bidding round pursuant
         to which this Agreement has been executed. The frequency and detail of
         reporting under the Uniform Reporting System shall be consistent with
         the Affiliate's normal business practices (which may change over time),
         the requirements of applicable Venezuelan Laws and Decisions and the
         provisions of the Agreement. The Uniform Reporting System may be
         modified from time to time by the Affiliate, following review and
         comment by the Contractors and the Operator, The Contractors and
         Operator will be required to comply in all material respects with the
         Uniform Reporting System.

2.2      Monthly Reports

         Subject to the requirements of the Uniform Reporting System, the
         Operator shall provide monthly reports to the Affiliate no later than
         the 10th day of the immediately following month (or, in the case of
         the last month of any Quarter, the earlier of the 5th day of the
         immediately following month or the day on which the relevant invoice is
         delivered to the Affiliate), The monthly report shall include all
         relevant information separately for each Field and for Exploration
         Expenditures, as well as aggregate information for all Fields.

         2.2.1   Chargeable Expenditures. Each monthly report shall specify the
                 aggregate amount of Chargeable Expenditures incurred by the
                 Operator in the relevant month, separately indicating the
                 budget items and AFEs (or groupings of budget items and AFEs)
                 to which the Expenditures relate and the amount of luxury and
                 wholesale taxes (or other similar Venezuelan sales or value
                 added taxes) paid by the Operator and reimbursable to the
                 Contractors pursuant Article 1.6 of these Accounting
                 Procedures.

         2.2.2   Production. Each monthly report shall specify the volume of
                 Production delivered to the Affiliate at each Delivery Point
                 in the relevant month pursuant to Clause 15.4 of the
                 Agreement.
                 
         2.2.3   Expenditure Reduction. Each monthly report shall specify the
                 aggregate amount of any Expenditure Reductions in the relevant
                 month, separately indicating the types of such Expenditure
                 Reductions.

         2.2.4   Service Fee. The monthly report for any month other than the
                 last month of any Quarter shall include an estimate of the
                 Service Fee that the Operator expects will be payable in
                 respect of the Quarter during which such month occurs, based on
                 actual activities conducted through the end of such month and
                 the Operator's expectations as to activities to be conducted
                 during the remainder of such Quarter, The monthly report for
                 the last month for any Quarter shall include a copy of the
                 invoice showing the Service Fee payable for such Quarter (or,
                 if such invoice has



                                       7
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                 not yet been finalized, shall include a statement as to the
                 amount of the Service Fee expected to be payable for such
                 Quarter).

         2.2.5   Other Information. The monthly report shall include such other
                 information as is specified in these Accounting Procedures or
                 the Uniform Reporting System or as may be reasonably requested
                 by the Affiliate.

2.3      Annual Reports

         Subject to the requirements of the Uniform Reporting System, the
         Operator shall provide an annual report to the Affiliate, setting forth
         the information required to be contained in the relevant monthly
         reports on an aggregate basis for the relevant year. An annual report
         relating to activities conducted by the Operator in any Calendar Year
         shall be provided to the Affiliate no later than February 15 of the
         immediately following Calendar Year. If the audit of such annual report
         is not yet complete by such date, a preliminary, unaudited annual
         report may be provided, provided that the audited annual report must
         be provided no later than March 31.

III.     AUDITS

3.1      Annual Audit

         In accordance with Clause 18.3 of the Agreement, an annual audit will
         be performed by a firm of independent auditors designated by the
         Contractors and approved by the Affiliate. A report of such external
         auditors shall accompany each audited annual report provided by the
         Operator pursuant to Article 2.3 of these Accounting Procedures, and
         shall confirm the calculation of the amounts specified therein, or
         shall note any exceptions of such external auditors with respect to the
         amounts specified therein.


3.2      Additional Audit

         The Affiliate may require that one additional audit be performed in any
         year. Such additional audit shall be performed by a firm of independent
         auditors of recognized international standing with expertise in
         Venezuelan accounting principles appointed by the Affiliate or by duly
         qualified auditors that are employees of the Affiliate or an Associated
         Entity of the Affiliate. Such additional audit may cover any or all
         annual reports, monthly reports or invoices prepared in the then
         current Calendar Year and the two preceding Calendar Years. Any annual
         report, monthly report or invoice not eligible for coverage in such an
         additional audit in accordance with the preceding sentence shall be
         deemed final and binding, except to the extent of any exceptions
         previously noted in an annual audit or additional audit or any items
         previously protested by a Party, which in either case have not yet been
         resolved. The Affiliate shall give at least 30 days' notice to the
         Operator of its intention to conduct such an additional audit.




                                       8
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3.3      Resolution Of Exceptions

         In the event that an audit performed pursuant to Article 3.1 or 3.2
         indicates any exceptions, or in the event that the Affiliate protests
         any item contained in an annual report, monthly report or invoice that
         is the subject of an audit conducted pursuant to Article 3.1 or 3.2,
         the Affiliate and the Operator shall attempt to reconcile the exception
         or the protested item. In the event that they are not able to achieve
         such a reconciliation within 180 days of the date of the audit report
         or the date of the protest, as the case may be, the matter shall be
         resolved by arbitration in accordance with Clause XXIII of the
         Agreement. The resolution of any such item shall include a mechanism
         for adjusting the resolved item (either by adjustment to a subsequent
         invoice or by payment from one party to the other party). Pending the
         resolution of any such item, the original position shall be maintained
         without adjustment.

3.4      Audit Expenses

         Expenses of any audit or confirmation provided pursuant to Article 3.1
         shall be paid by the Operator and shall be Chargeable Expenditures.
         Expenses of any audit conducted pursuant to Article 3.2 shall be paid
         by the Affiliate, except that they shall be payable by the Operator
         (and shall not be included as Chargeable Expenditures) if, as part of
         the resolution of any exception or protest based on such audit, the
         aggregate amount of the Service Fee payable by the Affiliate is reduced
         by at least $250,000 below the aggregate amount set forth in the annual
         reports, monthly reports and/or invoices being examined.

3.5      Conduct Of Audits

         Audits shall be conducted in a manner so as to minimize disruptions to
         the Operator's activities. The Operator shall cooperate with the
         auditors, including providing access to all relevant facilities during
         regular business hours and appropriate assistance to the auditors.

3.6      Cost Plus Contracts

         The Operator shall endeavor to obtain audit rights for all contracts of
         a "cost-plus" nature entered into in connection with the Operating
         Services.

IV.      CHARGEABLE EXPENDITURES

         Subject to the limitations set forth in these Accounting Procedures and
         the Agreement, the Operator may include in the calculation of the
         Service Fee the items of expenditure listed in this Article IV insofar
         as they are (i) paid on or after the Effective Date, and (ii) are
         reasonable and necessary for the conduct of the operations conducted in
         accordance with the Agreement (it being understood that items of
         expenditure falling under more than one heading set forth in this
         Article IV may be charged only once).

         Subject to the limitations provided in this Article IV, in Article 5.4
         and elsewhere in these Accounting Procedures and the Agreement,
         expenses incurred in the preparation of the



                                       9
   85




         Development Plan for a Field prior to the approval of such Development
         Plan may subsequently be included as Chargeable Expenditures in the
         calculation of the Service Fee for such Field.

         Expenses relating to more than one Field or related to a Field and to
         other activities of the Operator or Contractors shall be allocated as
         provided in Article 5.4.

4.1      Personnel Costs

         Actual costs of salary and related benefits of all personnel who work
         on the Operating Services directly for the Operator (including, without
         limitation, as a result of reasonable secondment from a Contractor or
         an Associated Entity of the Operator or a Contractor to the extent that
         such secondment is identified in an approved Annual Work Program and
         Budget) shall be chargeable, in accordance with the customary personnel
         policies of the Operator or the Contractor, as the case may be (or of
         any group of Associated Entities that includes the Operator or the
         Contractor). In the event that the Operator or Contractor (or their
         respective groups of Associated Entities) has no such policies, the
         Operator shall propose personnel policies to the Affiliate for
         approval, and personnel costs shall only be chargeable to the extent
         incurred in accordance with such approved policies. Costs of personnel
         that work an both the Operating Services and other operations shall be
         allocated on the basis of the proportion of time spent in the relevant
         activities.

4.2      Administrative Overhead Costs

         4.2.1   The Operator shall be entitled to charge in each Calendar Year
                 an amount in respect of administrative overhead equal to 1% of
                 the Chargeable Expenditures charged pursuant to Article 1.4.3
                 for such Calendar Year (other than Chargeable Expenditures
                 calculated pursuant to this Article 4.2). The Operator shall be
                 entitled to charge the Affiliate for administrative overhead
                 Quarterly, on the basis of the other Chargeable Expenditures
                 incurred in the relevant Quarter.

         4.2.2   Administrative overhead charges shall be allocated among
                 Fields, and as Exploration Expenditures, in proportion to the
                 respective amounts of other Chargeable Expenditures allocated
                 to such Fields or as Exploration Expenditures.

4.3      Expenses Incurred by Personnel

         All direct expenses reasonably and necessarily incurred by personnel
         who work under the direct control of the Operator on the Operating
         Services shall be chargeable, including reasonable travel,
         accommodations and communications expenses for personnel working
         directly for the Operator away from their permanent residence in
         connection with such Operating Services, and reasonable relocation
         expenses for such personnel and their immediate families. All expenses
         charged pursuant to this Article 4.3 shall be in accordance with the
         customary personnel policies established by the Operator (or any group
         of Associated Entities that includes the Operator), except as otherwise
         provided by the Agreement. Relocation expenses at the termination of a
         period of work on the Operating Services will be charged on the basis
         of the lower of the cost of a return to




                                       10
   86





         point of origin or actual, and shall be apportioned between the
         departure location and the receiving location on an equitable basis, in
         accordance with the customary personnel policies described above.

4.4      Transport

         4.4.1   The cost of transport to move personnel and material reasonably
                 and necessarily incurred by the Operator in connection with the
                 Operating Services shall be chargeable, whether such
                 transportation is provided directly by the Operator or by a
                 third party under a contract awarded by the Operator.

         4.4.2   The cost of Transportation and Handling of Hydrocarbons
                 produced from any Field to the relevant Delivery Point or
                 Delivery Points shall be chargeable, and shall include:

                 (a)      tariffs paid for the use of Transportation and
                          Handling facilities (other than facilities constructed
                          or acquired by the Operator for the account of the
                          Affiliate as part of the Operating Services); and
               
                 (b)      costs associated with the construction, acquisition
                          and operation of any Transportation and Handling
                          facilities by the Operator for the account of the
                          Affiliate as part of the Operating Services.

4.5      Material

         4.5.1   Costs of material, equipment or other personal property
                 ("Material") purchased or leased by the Operator for use in
                 connection with the Operating Services shall be chargeable,
                 including Material purchased or transferred from warehouse
                 stock. Material purchased or leased for use in the Operating
                 Services shall be charged at cost, which shall mean net invoice
                 price (after deducting all trade and cash discounts actually
                 received that are deductible from the relevant price when paid)
                 together with any transport costs, forwarding and documentation
                 fees, insurance on transportation, packing costs, duties,
                 license fees, taxes (other than Venezuelan luxury and wholesale
                 taxes) and like items chargeable in respect of such goods.
                 Material transferred from warehouse stock of the Operator or
                 its Associated Entities shall be chargeable in accordance with
                 policies to be adopted by the Operator and approved by the
                 Affiliate, and shall not be chargeable in the absence of the
                 adoption and approval of such policies.

         4.5.2   So far as is consistent with efficient and economical operation
                 and provision for emergencies, only such Material shall be
                 purchased or leased as may be required for immediate use, and
                 the accumulation of surplus stocks shall be avoided.

4.6      Services

         The cost of services and facilities provided to the Operator for the
         Operating Services by subcontractors, consultants, Associated Entities
         or other Persons with whom contracts are




                                       11
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         concluded by the Operator in accordance with the contracting policies
         established in accordance with Clause XI of the Agreement shall be
         chargeable.

4.7      Litigation and Legal Services

         All costs and expenses of litigation, arbitration and other legal
         services necessary or expedient in connection with the Operating
         Services (including reasonable attorneys' fees) shall be chargeable,
         including amounts paid in settlement of claims and amounts paid
         pursuant to Clause 11.10 of the Agreement, other than costs and
         expenses incurred (i) in relation to claims made by one or more Parties
         against one or more other Parties in relation to the Agreement or the
         transactions contemplated therein, or (ii) as a result of or arising
         from the gross negligence or willful misconduct of the Operator or any
         Contractor.

4.8      Auditing Services

         All fees and expenses payable or reimbursable to the independent
         auditors that perform the annual audit specified in Article 3.1 of
         these Accounting Procedures shall be chargeable.

4.9      Taxes

         All taxes, duties and other governmental levies of every kind and
         nature assessed or levied upon or in connection with the Operating
         Services that have been paid by the Operator or the Contractors shall
         be chargeable, other than (i) corporate income taxes, (ii) luxury and
         wholesale or similar Venezuelan taxes that are eligible to be
         reimbursed to the Contractors pursuant to Article 1.6 of these
         Accounting Procedures, and (iii) as provided in the next sentence.
         Municipal and State taxes payable by the Contractors shall only be
         Chargeable Expenditures to the extent that (i) they are calculated
         based on the portion of the Service Fee corresponding to the
         Contractors' compensation as determined in accordance with Article VI
         of these Accounting Procedures, (ii) they are levied at a rate greater
         than 4%, and (iii) the Contractors take such measures as the Affiliate
         may reasonably request to challenge the imposition of such taxes over
         4% as excessive (such taxes in excess of 4% being chargeable as paid so
         long as the Contractors continue to take such measures). The cost of
         measures taken at the request of the Affiliate to challenge such taxes
         will constitute litigation expenses under Article 4.7. Subject to the
         above conditions, if such Contractors' compensation is subject to
         Municipal and State taxes in more than one taxing jurisdiction and the
         aggregate of the Municipal and State taxes in all such jurisdictions
         exceeds 4% of total compensation, the excess shall be Chargeable
         Expenditures; provided that, for purposes of calculating such
         Chargeable Expenditures, such total compensation will be deemed to have
         been subject to such tax only once (and not subject to double taxation
         by two or more such jurisdictions).

4.10     Damages and Losses

         All costs and expenses necessary for the repair or replacement of
         property acquired by the Operator for the account of the Affiliate with
         Chargeable Expenditures, or for loss of life or injury, due to fire,
         flood, storm, theft, accident or any other cause, or for remedying any
         environmental condition in the Area in accordance with Clause XXII
         of the Agreement, or





                                       12


   88





         in respect of any facilities used in connection with the Operating
         Services, shall be chargeable, other than (i) costs or expenses
         incurred as a result of or arising from the gross negligence or willful
         misconduct of the Operator or any Contractor, and (ii) any such costs
         and expenses, to the extent of any amounts recovered under any
         insurance policy and applied to the repair or replacement of the
         relevant property or the compensation of the relevant Persons in
         accordance with Clause 11.10 of the Agreement.

4.11     Insurance

         Insurance premiums shall be chargeable to the extent provided in Clause
         11.10(a) of the Agreement.

4.12     Real Property

         Payments made for the purchase or acquisition of real property used in
         connection with the Operating Services, including the acquisition or
         extension of rights-of-way and similar property rights, shall be
         chargeable. Costs relating to real property used in both the Operating
         Services and other operations shall be allocated in an equitable manner
         in accordance with formulas or guidelines to be proposed by the
         Contractor and approved by the Affiliate, and shall not be chargeable
         in the absence of the adoption and approval of such policies.

4.13     Royalties and License Fees

         Royalties and license fees payable in respect of any technological
         processes or other intellectual property licensed for use in connection
         with the Operating Services shall be chargeable.

4.14     Miscellaneous Expenditures

         Any cost or expense incurred by the Operator that is not covered in
         Articles 4.1 to 4.13 of these Accounting Procedures and that is
         reasonable and necessary for the provision of the Operating Services
         shall be chargeable, so long as such cost or expense (or the relevant
         type of cost or expenses) is approved by the Affiliate. Expenses
         specifically included in an Annual Work Plan and Budget will be deemed
         to have been approved.

V.       SERVICE FEE CALCULATION AND FINANCIAL MATTERS

5.1      General

         The Service Fee will be payable on a quarterly basis, beginning with
         the Quarter in which the Operation Period for the Field concerned
         begins, against presentation of invoices, in accordance with Clauses
         XVII and XVIII of the Agreement. A single Service Fee will be 
         calculated for each Quarter for each Field in accordance with the
         provisions set forth in this Article V. The Contractors may submit the
         invoice for any Quarter to the Affiliate at any time following the
         conclusion of such Quarter, and the Affiliate shall pay the applicable
         Service Fee to the Contractors at the time set forth in Clause 18.1 of
         the


                                       13


   89





         Agreement. The Affiliate shall pay the Service Fee for all of the
         Contractors to a single Dollar account inside or outside Venezuela
         designated in writing by the Operator. The Operator shall be
         responsible for allocating each such payment among the Contractors. The
         Affiliate shall be fully discharged from its obligations in respect of
         the Service Fee by making payment to the account specified pursuant to
         this Article 5.1, and shall have no responsibility in the event that
         the Operator fails to allocate any such payment properly.

5.2      Service Fee Formula
           
5.2.1    The Service Fee for any Field for any Quarter (q) shall be calculated 
         in accordance with the following formula:

                                                  *


* Confidential portions on pages 14, 15, 16 and 17 have been omitted pursuant to
  a request for confidential treatment and filed separately with the Commission.


                                       14
   90


*

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



         
                                       15
   91
*

  5.2.2  For purposes of determining the Service Fee for any Quarter in which
         MIRR(q) becomes positive after having been negative in the immediately
         preceding Quarter, the Quarter in respect of which the calculation is
         being made shall be divided into two periods. One such period shall be
         of sufficient duration so that MIRR(q) as of the end of such period
         shall be zero, and the other such period shall reflect the remainder 
         of the Operating Services conducted during such Quarter. A separate 
         Service Fee shall be calculated for each such period (as if each were a
         Quarter), and the Service Fee for such Quarter shall be equal to the
         sum of the Service Fees calculated for such periods.

  5.2.3  For purposes of calculating the Service Fee, in the event that the
         Production from the Initial Field for any Quarter is less than the
         Baseline Production (or, during the first 12 months after the Takeover
         Date, more than 10% below the Baseline Production for such Quarter),
         the shortfall (which, in such first 12 months, shall be the excess of
         the shortfall over 10%) shall be applied in the following Quarter (and,
         if necessary, in subsequent Quarters) to reduce the Incremental
         Production and to increase the Baseline Production until the entire
         shortfall has been so applied. This Article 5.2.3 shall not apply to
         the extent that a shortfall in Baseline Production results from a
         reduction or curtailment of Production pursuant to Clauses 11.1(b),
         XIV, 15.4(b), 22.5 or XXVI of the Agreement or as a result of
         extraordinary maintenance to surface facilities.

  5.3    Baseline Production

         The portion of the Service Fee consisting of a payment for Baseline
         Production for any Quarter ("A(q)" in the formula set forth in Article
         5.2) shall be calculated for each Quarter in accordance with the
         following formula:
                                *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       16
   92

*

         The payment for Baseline Production shall only be made in respect of
         the Initial Field. No other Field has Baseline Production.

  5.4    Ringfencing and Allocation

  5.4.1  Except as otherwise approved by the Affiliate, the Service Fee shall be
         calculated separately for each Field. Production and Chargeable
         Expenditures allocable to one Field in accordance with this Article 5.4
         shall not be included in the calculation of the Service Fee for any
         other Field.

  5.4.2  All Chargeable Expenditures and Production shall be allocated among
         Fields in accordance with the procedures set forth in this Article 5.4.

  5.4.3  Chargeable Expenditures that relate exclusively to Operating Services 
         within, or in respect of, the interior of the Field Boundary of a
         single Field shall be allocated in full to such Field.

  5.4.4  Chargeable Expenditures associated with the Transportation and 
         Handling of Production from the wellhead or other point of extraction
         to the relevant Delivery Point shall be allocated in full to the Field
         from which such Production is realized. To the extent that such
         Production is blended with other Hydrocarbons prior to its delivery at
         the Delivery Point, such Chargeable Expenditures shall be allocated to
         the relevant Fields in the manner set forth in Article 5.4.6.

  5.4.5  (a)  Exploration Expenditures shall not be included in the calculation 
              of the Service Fee for any Field, except as follows:

         (i)  Well Expenditures for wells with a target zone within the Field 
              Boundary of a subsequently established Field (or, in the case of
              wells with multiple target zones, a portion of such Well
              Expenditures, calculated in the manner set forth in paragraph (b)
              below) shall be included in the calculation of the Service Fee for
              such Field, as of the first Quarter following the approval of the
              applicable Development Plan by the Affiliate; provided that such
              wells are completed as producing wells or injection wells for such
              Field in accordance with International Oil Industry


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       17
   93


              Standards and are included as such in the applicable Development
              Plan for such Field; and

         (ii) Exploration Expenditures other than Well Expenditures shall be
              included in the calculation of the Service Fee for the Field, if
              any, for which the immediately following Development Plan is
              approved by the Affiliate, except that no Exploration Expenditures
              shall under any circumstances be included in the calculation of
              the Service Fee for the Initial Field (unless the Exploration
              Activities concerned lead to the discovery of a Hydrocarbon
              formation outside the Initial Field that is found to be Connected
              with the Initial Field and subsequently included within amended
              Field Boundaries for the Initial Field pursuant to Clause 8.8 of
              the Agreement).

         (b)  In the event that any well is drilled with multiple target zones 
         in the Area, except as otherwise approved by the Affiliate, the related
         Well Expenditures shall be allocated among such target zones such that
         (x) Well Expenditures incurred in connection with reaching the first
         target zone in the Area and any completion or recompletion in respect
         of such target zone shall be allocated in full to such target zone, and
         (y) Well Expenditures incurred in connection with drilling from any
         target zone to any other target zone, and any completion or
         recompletion in respect of the latter target zone, shall be allocated
         in full to the latter target zone.

  5.4.6  In the event that:

         (a)  The Operator incurs or proposes to incur Chargeable Expenditures 
              relating to more than one Field; or

         (b)  Production from a Field is combined with other Hydrocarbons 
              (whether or not constituting Production hereunder) prior to its 
              delivery at an applicable Delivery Point,

         such Chargeable Expenditures or Production (and the Chargeable
         Expenditures associated with Transportation and Handling of such
         Production) shall be allocated by the Operator on the basis of formulas
         or guidelines approved by the Affiliate and included in the relevant
         Development Plans or Annual Work Programs and Budgets, based on such
         equitable mechanisms as are customary in similar circumstances in the
         international oil industry or as may be approved by the Affiliate. If
         the Operator believes that any decision by the Affiliate to withhold
         its approval of any such mechanism is not consistent with the foregoing
         standard, the Operator may at any time until the expiration of 30 days
         following the date of rejection require that the final determination be
         made by an independent expert appointed in accordance with Clause 23.3
         of the Agreement. The decision of the expert shall be final and
         binding.

  5.5    Royalties

         The Royalties that are to be deducted from the value of the Incremental
         Production from a Field in calculating Net Hydrocarbon Value for any
         Quarter shall be equal to the product




                                       18
   94

         of (i) the applicable Royalty Rate, (ii) the volume of the Incremental
         Production in any Quarter for which the Royalty is to be deducted
         pursuant to these Accounting Procedures, and (iii) the wellhead value
         of such Production, all determined in accordance with Venezuelan law.
         The Royalty Rate shall be the rate at which the exploitation tax is
         actually assessed by the Ministry of Energy and Mines in accordance
         with applicable Venezuelan laws and regulations. As of the date of the
         Effective Date, the Royalty Rate is *.

  5.6    Abandonment Costs

         Chargeable Expenditures incurred in the last five years of the
         Operation Period for any Field (without regard to any extension of the
         Operation Period, unless such extension is granted before the relevant
         Chargeable Expenditures are incurred) and associated with plugging and
         abandoning wells or removing facilities in accordance with Clause XXI
         or with the final environmental audit and any Post-Takeover Date
         Environmental Claim and Cleanup Liability in accordance with Clause
         XXII of the Agreement ("Abandonment Costs") shall be included in the
         calculation of the Service Fee in the manner set forth in this Article
         5.6 in the circumstances described in this Article 5.6.

         (i)   Whenever CF(q) (as determined in accordance with Article 5.2) for
               the Quarter in which Abandonment Costs are incurred is negative,
               an amount (the "Shortfall Amount") equal to the lesser of (i) the
               total amount of such Abandonment Costs, and (ii) the absolute
               value of CF(q) for such Quarter shall be calculated.

         (ii)  The Operator may charge and include the Shortfall Amount in the
               succeeding Quarter as if the Shortfall Amount were a Chargeable
               Expenditure incurred in such succeeding Quarter. If after
               applying the Shortfall Amount in such manner, CF(q) for such
               succeeding Quarter is negative, then the excess portion of the
               Shortfall Amount shall be calculated and applied to the
               calculation of the Service Fee for the next succeeding Quarter,
               as if the excess Shortfall Amount so applied were a Chargeable
               Expenditure incurred in such Quarter. This process shall continue
               until a Quarter is reached in respect of which CF(q), determined
               after applying any remaining Shortfall Amount, is positive.

         (iii) Periodically, the Operator shall make an assessment as to whether
               the aggregate of CF(q) for all remaining Quarters in the
               Operation Period will be greater than the total of all remaining
               Shortfall Amounts, based on forecast Production and Chargeable
               Expenditures in the Development Plan and the Price Formula. If
               so, then no further calculations shall be made. If not, then the
               Operator shall calculate an amount equal to the excess of the
               Shortfall Amount over the sum of the projected CF(q) amounts for
               all such remaining Quarters (such excess, the "Carryback
               Amount"). As of the end of each Quarter remaining in the
               Operation Period, the Operator shall periodically reassess any
               Carryback Amount that has not yet been recovered as provided
               below and shall, if necessary, adjust the remaining Carryback
               Amount accordingly.


*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       19
   95
         (iv)  The Operator shall redetermine the Service Fee (without
               recalculation of MIRR(q) for the immediately preceding Quarter as
               if the Carryback Amount had been a Chargeable Expenditure
               incurred in such prior Quarter.

          (v)  If after applying the Carryback Amount in such manner, CF(q) for
               such preceding Quarter is negative, then the excess portion of
               the Carryback Amount shall be calculated and applied to the
               recalculation of the Service Fee for the next preceding Quarter,
               as if the excess Carryback Amount so applied were a Chargeable
               Expenditure incurred in such Quarter. This process shall continue
               until a Quarter is reached in respect of which CF(q), determined
               after applying any remaining Carryback Amount, is positive.

         (vi)  The Operator shall determine, for each Quarter in respect of
               which the Service Fee is recalculated as provided above, the
               difference between (x) the Service Fee as so recalculated, and
               (y) the Service Fee originally charged for such Quarter.

         (vii) The sum of the differences determined pursuant to clause (vi)
               shall be chargeable to the Affiliate as an addition to the
               Service Fee for the Quarter in which the Abandonment Costs are
               incurred or for a subsequent Quarter as determined by the
               Operator, and shall be reflected separately on the relevant
               invoice.

  VI.    AMORTIZATION OF ADVANCES AND ALLOCATION OF THE SERVICE FEE

  6.1    General

         All goods and services that are purchased or leased by the Contractors
         from third parties in connection with the Operating Services (including
         any goods or services purchased or leased from an Associated Entity of
         any Contractor acting as a supplier) shall be deemed to have been
         acquired for the account of the Affiliate and funded through
         non-recourse advances from the Contractors to the Affiliate. Such
         advances shall be repayable to the Contractors only to the extent that
         a portion of the Service Fee is applied to amortize such advances in
         accordance with this Article VI. Any such advances that are not so
         amortized at the time of termination of the Agreement with respect to
         any Field, and any such advances in respect of Exploration Expenditures
         that are not allocated to a Field prior to the termination of this
         Agreement, shall be deemed canceled at the time of such termination.

         No interest shall be separately calculated or paid with respect to any
         such advances. Financing charges associated with such advances shall be
         deemed to be included and entirely paid as part of the portion of the
         Service Fee representing the Contractors' compensation for the
         Operating Services.

         For purposes of calculating the amount of any Municipal and State taxes
         that may be Chargeable Expenditures pursuant to Article 4.9, the
         Contractors shall include as revenues subject to such taxes only that
         part of the Service Fee that corresponds to the Contractors'
         compensation for the Operating Services and not the portion
         corresponding to the reimbursement of such advances made by the
         Contractors to the Affiliate.


                                       20
   96


  6.2    Principles of Amortization

         Advances made by the Contractors to the Affiliate as provided in
         Article 6.1 shall be amortized on the basis of PDVSA Accounting
         Principles in effect from time to time, which currently provide as
         follows:

         (i)   advances in respect of items that would be treated as expenses 
               in the Quarter in which they are incurred for Venezuelan tax
               purposes shall be amortized in the year in which they are
               incurred;

         (ii)  advances in respect of fixed assets and capitalized expenses
               upstream of the first tank farm shall be amortized on a unit of
               production basis according to the proved developed reserves for
               the Field concerned (or the Fields concerned, if such advances
               are in respect of Chargeable Expenditures allocated to more than
               one Field), on the basis of the reserves estimates and production
               profiles specified in the relevant Development Plan; and 

         (iii) advances in respect of fixed assets and capitalized expenses at
               the first tank farm or downstream of the first tank farm shall be
               amortized using the straight-line method, based on the useful
               life of such assets;

         in each case, to the extent the Service Fee is sufficient for such
         purpose or otherwise in subsequent Quarters until the Service Fee for
         such subsequent Quarters is sufficient for such purpose (amortizing in
         each Quarter the advances with the shortest remaining amortization
         period first).

  6.3    Allocation of the Service Fee

         The Service Fee for any Field and for any Quarter shall be allocated 
         first to the reimbursement of advances calculated as provided above and
         then to compensation of the Contractors for providing the Operating
         Services hereunder. For each Quarter, the Operator shall provide the
         Affiliate with a separate statement for the reimbursement amount and an
         invoice for the compensation amount, in each case in the forms provided
         in the URS. If the Service Fee is insufficient to cover all
         reimbursements deemed due in a Quarter as provided in Article 6.2, then
         the shortfall will be carried over to the next Quarter and the
         Contractors will not receive any compensation component of the Service
         Fee for such Quarter.

  6.4    No Effect on Service Fee Calculation or Payment

         The rate of amortization of advances pursuant to this Article VI shall
         not affect in any manner whatsoever the calculation of the Service Fee
         for any Field or the total amount payable as the Service Fee by the
         Affiliate in respect of any Field and any Quarter.



                                       21
   97


                  SCHEDULE A



     Area                          Percentage
     ----                          ----------
                                  
  Acema                               *   
  Ambrosio                            *   
  Bachaquero S. 0.                    *   
  Boqueron                            *   
  B2X-68/79                           *   
  B2X-70/80                           *   
  Cabimas                             *   
  Caracoles                           *   
  Casma-Anaco                         *   
  Cretacico Sur                       *   
  Dacion                              *   
  Intercampo N.                       *   
  Kaki                                *   
  La Concepcion                       *   
  La Vela Costa Afuera                *   
  LL-652                              *   
  Mata                                *   
  Maulpa                              *   
  Mene Grande                         *   
  Onado                               *   



*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.
   98
<ST,2,,0>Expenses<TA>0.20<et>% 



                                   SCHEDULE B



 Quarter         T(q)                    Quarter        T(q)
   (q)                                     (q)
 ------------------------                ------------------------
                                                
   1             *                          42           *
   2             *                          43           *
   3             *                          44           *
   4             *                          45           *
   5             *                          46           *
   6             *                          47           *
   7             *                          48           *
   8             *                          49           *
   9             *                          50           *
   10            *                          51           *
   11            *                          52           *
   12            *                          53           *
   13            *                          54           *
   14            *                          55           *
   15            *                          56           *
   16            *                          57           *
   17            *                          58           *
   18            *                          59           *
   19            *                          60           *
   20            *                          61           *
   21            *                          62           *
   22            *                          63           *
   23            *                          64           *
   24            *                          65           *
   25            *                          66           *
   26            *                          67           *
   27            *                          68           *
   28            *                          69           *
   29            *                          70           *
   30            *                          71           *
   31            *                          72           *
   32            *                          73           *
   33            *                          74           *
   34            *                          75           *
   35            *                          76           *
   36            *                          77           *
   37            *                          78           *
   38            *                          79           *
   39            *                          80           *
   40            *        
   41            *        



*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.
   99
ANNEX D

(Translation]

                         [FORM OF CONTRACTOR GUARANTEE]

                         GUARANTEE OF PROPER PERFORMANCE

     Reference is made to the Operating Agreement (the "Agreement") of even date
herewith among _____________. (together with its successors and assigns, the 
"Affiliate") a sociedad anonima organized under the laws of the Republic of 
Venezuela, _________________ (the "Guaranteed Entity") a ________________
organized under the laws of __________________, and ________________, a
_________________ organized under the laws of ___________________.

     With regard to the obligations assumed by the Guaranteed Entity under the
Agreement or that may be imposed upon the Guaranteed Entity under or in
connection with the Agreement, ____________________ (the "Guarantor"), a
________________ organized under the laws of __________________, an Associated
Entity of the Guaranteed Entity, agrees as follows:

1.   Capitalized terms used herein and not otherwise defined shall have the
     meanings set forth in the Agreement.

2.   The Guarantor hereby expressly represents and warrants to the Affiliate
     that: (i) it is duly organized, validly existing and in good standing under
     the laws of its jurisdiction of organization, (ii) it has all requisite
     corporate power and authority to execute, deliver and perform this
     Guarantee, (iii) the execution, delivery and performance of this Guarantee
     have been duly authorized by all necessary corporate action, (iv) this
     Guarantee constitutes the legal, valid and binding obligation of the
     Guarantor, enforceable against the Guarantor in accordance with its terms,
     (v) no governmental approvals are required in connection with the
     execution, delivery and performance of this Guarantee, except as have been
     obtained and are in force, and (vi) the execution, delivery and performance
     of this Guarantee by the Guarantor will not violate any provision of any
     existing law or regulation to which the Guarantor is subject or any
     provision of the Guarantor's constitutive documents or of any material
     agreements to which it may be a party.

3.   The Guarantor hereby unconditionally and irrevocably guarantees to the
     Affiliate, as a primary obligor, the due and punctual performance of all of
     the obligations of the Guaranteed Entity under or in connection with the
     Agreement. If the Guaranteed Entity fails to perform any such obligation in
     the manner and at the time required, the Guarantor shall perform or procure
     the performance of such obligation upon demand by the Affiliate.


- --------------------

(1) Add or delete spaces as appropriate to reflect the number of Contractors.




   100



4.   This Guarantee is irrevocable and unconditional and shall remain in full
     force and effect until all obligations of the Guaranteed Entity under or in
     connection with the Agreement are fully and irrevocably satisfied and
     discharged, notwithstanding (a) any amendment or termination of the
     Agreement, (b) any extension of time or other indulgence or concession
     granted by the Affiliate, or (c) any delay or failure by the Affiliate in
     pursuing any remedies available against the Guaranteed Entity.
     Notwithstanding the foregoing, this Guarantee shall terminate with respect
     to liabilities arising from improper abandonment of wells or facilities in
     any area outside a Field or in any Field on the fifth anniversary of the
     termination of the Agreement with respect to such area or Field.

5.   The provisions contained in Article 547 of the Commercial Code of Venezuela
     will be fully applicable to this Guarantee. Accordingly, the Affiliate
     shall have no obligation to pursue any remedy or take any action against or
     in respect of the Guaranteed Entity prior to enforcing its rights under
     this Guarantee directly against the Guarantor. In addition, the Guarantor
     may not claim that the Affiliate could have avoided or mitigated, in any
     manner or through any action, the damages resulting from a default of the
     Guaranteed Entity under the Agreement or resort to any other guarantee held
     at any time in its favor, before proceeding against the Guarantor in
     connection with its obligations under this Guarantee. The Guarantor's
     obligations under this Guarantee shall be independent and absolute, and the
     Guarantor shall have no right of setoff or counterclaim with respect to any
     other claims it may have against the Affiliate or any other Person.

6.   All of the obligations of the Guarantor set forth herein shall bind the
     Guarantor and its successors. The Guarantor may not assign or delegate its
     duties or obligations hereunder without the prior written consent of the
     Affiliate, and any purported assignment or delegation without such consent
     shall be null and void. The Guarantor confirms that this Guarantee shall
     remain in effect with respect to any assignee of the Guaranteed Entity
     under the Agreement that is an Associated Entity of the Guaranteed Entity.
     Upon any such assignment the assignee shall be considered the Guaranteed
     Entity for all purposes hereunder to the extent of the assigned
     obligations. The Guarantor additionally confirms that any assignee of the
     Affiliate under the Agreement permitted in accordance with Clause 27.3 of
     the Agreement may exercise all rights and remedies of the Affiliate under
     this Guarantee. No other person or entity shall be a beneficiary of this
     Guarantee or have or acquire any rights by reason of this Guarantee.

7.   This Guarantee shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela.

8.   Any failure or delay by the Affiliate to exercise any right, in whole or in
     part, hereunder shall not be construed as a waiver of the right to exercise
     the same or any other right.

9.   No amendment or modification of this Guarantee shall be effective unless in
     writing and signed by the Guarantor and the Affiliate.

10.  Any dispute concerning the legal interpretation or construction of this
     Guarantee shall be settled exclusively and finally by arbitration conducted
     in accordance with the Rules of the



                                       2
   101



     International Chamber of Commerce ("ICC"). The Affiliate shall select an
     arbitrator and the Guarantor shall select an arbitrator in accordance with
     the ICC Rules. The arbitrators so nominated shall then agree within 30 days
     on a third arbitrator to serve as Chairman. The arbitration shall be
     conducted in New York City (United States of America). Notwithstanding the
     foregoing, in the event that a dispute involves both the Guarantor and the
     Guaranteed Entity, arbitration shall be conducted in accordance with Clause
     23.2 of the Agreement, as a single proceeding, and Guarantor and the
     Guaranteed Entity shall jointly have the rights of the Guaranteed Entity
     under such Clause 23.2.

11.  The Guarantor shall pay upon demand and presentation of invoices all
     reasonable and actual costs and expenses incurred by the Affiliate in
     connection with the successful enforcement of this Guarantee, including,
     without limitation, reasonable fees and expenses of counsel.

12.  All notices, demands, instructions, waivers or other communications to be
     provided pursuant to this Guarantee. and any consents contemplated in this
     Guarantee, shall be in writing in Spanish or English, shall be effective
     upon receipt, and shall be sent by personal delivery, courier, first class
     mail, facsimile or telex, to the following addresses:

     i)  If to the Guarantor, to:

     ii) If to the Affiliate, to:

     The addresses and telex and facsimile numbers of either party for notices
     given pursuant to this Guarantee may be changed by means of a written
     notice given to the other party at least 15 Business Days prior to the
     effective date of such change.

13.  This Guarantee is being executed in both the Spanish language and the
     English language. The Spanish version shall constitute the binding version,
     and the English version is being executed as a matter of reference only.

14.  This Guarantee may be executed in any number of counterparts, each of which
     shall be deemed to be an original.





                                        3
   102

This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of
______________,1997.


                                             NAME OF GUARANTOR)


                                             By:                              
                                                ------------------------------
                                             Name:                            
                                                  ----------------------------
                                             Title:                           
                                                   ---------------------------


ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   ------------------------------
Name:
     ----------------------------
Title:
      ---------------------------



                                       4
   103
ANNEX E


(Translation]


                           DEVELOPMENT PLAN GUIDELINES


     This Annex sets forth the topics required to be covered in a Development
Plan submitted to the Affiliate for approval, to the extent applicable to the
relevant Field. While this Annex describes the general requirements of the
Development Plan and incorporates those set forth in Clauses 6.2 and 8.4 of the
Agreement, there is no detailed prescription of the format or the level of
detail to be presented, other than coverage of the key topics identified herein.
Additional information may be presented in a Development Plan to the extent
appropriate to the relevant activities.

1.   Description of Field.

     (a) Description of the Field to be developed.

     (b) Field Boundaries of the Field to be developed.

     (c) Description of the Hydrocarbon-bearing formations to constitute the
         Field.

2.   Reserves and Production.

     (a) An estimate of proved, probable and possible reserves in the Field for
         each reservoir (in each case, determined on a life-of-field basis,
         without regard to the duration of the Operation Period), separated by
         Liquid Hydrocarbons (separately for crude oil, condensate and natural
         gas liquids) and Natural Gas.

     (b) An estimate of the production profile for each reservoir of the
         Hydrocarbons that the Contractors expect to deliver to the Affiliate in
         each year during the Operation Period for the proved and proved plus
         probable reserves cases (separately indicating the amount of projected
         Incremental Production), and an explanation of how the production
         profile in the proved reserve case achieves the Maximum Economic Rate
         of Production (unless Production is constrained by the Delivery Point
         Capacity)

3.   Description of Proposed Activities.

     (a) Description of the proposed rehabilitation, reactivation, enhancement
         or development scheme, as applicable, including the following:




   104



         (i)   General description of expected activities for the relevant
               Operation Period.

         (ii)  Description of planned facilities, both inside and outside of
               Field Boundaries.

         (iii) Description of drive mechanism and reservoir management policy.

         (iv)  The designation of additional Delivery Points that the
               Contractors plan to use in accordance with Clause 15.3 of the
               Agreement and Hydrocarbon Transportation and Handling
               arrangements, including routing to Delivery Points, type of
               Transportation and Handling facilities and expected use of
               Affiliate or third party facilities.

         (v)   Expected arrangements for abandonment of facilities to be
               utilized in the course of the work program.

     (b) Plan for the periodic inspection of all inactive wells in the Initial
         Field at least twice per year and, unless otherwise agreed by the
         Affiliate in its discretion, a plan for the periodic surveillance of
         subsidence in around the Area that may be affected by Production.

     (c) Principal contingent features of proposed activities, and likely
         additional activities to be undertaken depending on results of
         specified initial activities.

     (d) Alterative approaches considered and reasons for choice of approach
         selected.

     (e) Schedule of activities, including expected schedule for construction or
         acquisition of major facilities and timetable for achieving commercial
         production rates (for Fields not currently in production) and Maximum
         Economic Rate (or Delivery Point Capacity).

     (f) Plan for the transfer of operations in accordance with Clause 11.8 of
         the Agreement.

4.   Budget and Economics.

     (Note: All financial information should be expressed in constant dollars, 
     with no adjustment for inflation.)

     (a) Projected & capital and operating expenditures for the Operation Period
         for proved and proved plus probable reserves cases, prepared in
         accordance with the Uniform Reporting System, including (for the
         Initial Field) confirmation that the Minimum Work Obligation will be
         met.

     (b) Sharing and allocation arrangements, including:



                                       2
   105



         (i)   Arrangements for Fields extending outside the Area, adopted or
               expected to be adopted pursuant to Clause XIII of the Agreement.

         (ii)  Any arrangements for sharing of facilities or other costs, or for
               commingling and reallocation of Production, whether in respect of
               other Fields or otherwise, and guidelines for effecting
               allocations under Article 5.4 of the Accounting Procedures.

     (c) Contractor Participations in Field.

     (d) Expected Field returns and discounted cash flow analysis, in each case
         based on assumptions to be set forth in the Development Plan (including
         such reasonable assumptions as may be required by the Affiliate by
         notice to the Operator from time to time).

     (e) An estimate of the Service Fees that the Contractors expect to be
         payable by the Affiliate during each year of the Operation Period for
         each reserves case.

     (f) Expected duration of pre-operative phase, if any.

5.   Safety and Environmental Considerations.

     (a) Description of environmental program and contingency plans to be
         established pursuant to Clause 22.1 of the Agreement.

     (b) Description of program for protection of safety of personnel and other
         safety related programs.

6.   Additional Information for Amendments and Updates.

     (a) Reasons for proposed amendment or update.

     (b) Discussion of activities conducted since original Development Plan or
         previous amendment or update, as the case may be.

     (c) Revised presentation of all information described in clauses 1 through
         4 above (or, to the extent appropriate, only such information as is 
         being amended or updated).





                                        3
   106
                                                                   BOQUERON AREA

ANNEX F



                        Initial Contractor Participations



                                                      
             Union Texas Venezuela Ltd.               66.67%
             Preussag Energie GmbH                    33.33%





   107
ANNEX G

[Translation]


                      FORM OF OPERATOR ACCESSION AGREEMENT

(Date]

[Affiliate] 
[Address]

[Contractor 1]
[Contractor 2]
c/o [Contractor 1]
[Address]

       Re:    Accession to Operating, Agreement

Ladies and Gentlemen:

     We address you on this opportunity in order to refer to the Operating
Agreement (the "Agreement"), dated ____________ 1997, between [Affiliate], 
[Contractor I] and [Contractor 2].

     [Name of Operator) (the "0perator") agrees to perform fully all of the
obligations and responsibilities attributed to it under the Agreement, to the
extent and in the manner in which they are set forth.

     In addition, the Operator acknowledges all the rights to which it has
become entitled under the Agreement, which it hereby assumes and may fully
exercise.

     This accession agreement shall be governed by, and construed in accordance
with, the laws of the Republic of Venezuela.


                                           Very truly yours,

                                           [NAME OF OPERATOR]

                                           By:
                                              ------------------------------
                                           Name:
                                           Title:


- --------------------

(1) Add or delete as appropriate to reflect the number of Contractors.

   108

                                    ANNEX H
                            DELIVERY OF HYDROCARBONS
                                 BOQUERON AREA


1.    DELIVERY POINT OF LIQUID HYDROCARBONS

      La Toscana manifold inlet (gross production).

2.    QUALITY OF LIQUID HYDROCARBONS AT THE DELIVERY POINT

      Liquid Hydrocarbons must meet the following conditions:

      Gravity:                         > 22 degrees API
                                       -
      Sand content:                    < 0.05%
                                       -     
      Sulfur:                          < 1.5% in weight
                                       -
      Wax, paraffins and asphaltines:  Contractors must prevent precipitation
                                       upstream of Delivery Point and cooperate
                                       with the Affiliate for such prevention
                                       downstream of Delivery Point.

3.    DELIVERY POINT CAPACITY OF LIQUID HYDROCARBONS

      20 MBD gross (with a maximum of 1% of water content).

4.    DELIVERY POINT OF ASSOCIATED GAS

      La Toscana manifold inlet.

5.    QUALITY OF DELIVERED ASSOCIATED GAS

      Delivered Associated Gas must meet the following conditions:

      C0(2) Content:                    < 5% molar
                                        -  
      Water Content:                    < 7 Pounds/MSCF
                                        -
      H(2)S Content:                    < 15 ppmv
                                        -



BOQUERON AREA                         H-1
   109

                                     ANNEX I
                               BASELINE PRODUCTION
                                  BOQUERON AREA


Baseline Production
Decline Factor:            0.10 annually

Deemed Cost
of Baseline Production:    1.25 $/NB



BOQUERON AREA                          I-1
   110

ANNEX J

[Translation]

                          [FORM OF OPERATOR GUARANTEE]

                         GUARANTEE OF PROPER PERFORMANCE
                         -------------------------------

     Reference is made to the Operating Agreement dated ____________ among
____________ (together with its successors and assigns, the "Affiliate"), a
sociedad anonima organized under the laws of the Republic of Venezuela;
___________________, a ____________________ organized under the laws of
____________________; and _________________, a __________________ organized
under the laws of _________________; (1) and to which __________________ (the 
"Operator"), a __________________ organized under the laws of ______________,
has become a party pursuant to an Accession Agreement of even date herewith.

     With regard to the obligations assumed by the Operator under the Operating
Agreement, or that may be imposed upon the Operator under or in connection with
the Operating Agreement, ___________________ (the "Guarantor"), a
_______________ organized under the laws of __________________, an Associated
Entity of the Operator, agrees as follows:

1.   Capitalized terms used herein and not otherwise defined shall have the
     meanings set forth in the Operating Agreement.

2.   The Guarantor hereby expressly represents and warrants to the Affiliate
     that, (i) it is duly organized, validly existing and in good standing
     under the laws of its jurisdiction of organization, (ii) it has all
     requisite corporate power and authority to execute, deliver and perform
     this Guarantee, (iii) the execution, delivery and performance of this
     Guarantee have been duly authorized by all necessary corporate action, (iv)
     this Guarantee constitutes the legal, valid and binding obligation of the
     Guarantor, enforceable against the Guarantor in accordance with its terms,
     (v) no governmental approvals are required in connection with the
     execution, delivery and performance of this Guarantee, except as have been
     obtained and are in force, and (vi) the execution, delivery and performance
     of this Guarantee by the Guarantor will not violate any provision of any
     existing law or regulation to which the Guarantor is subject or any
     provision of the Guarantor's constitutive documents or of any material
     agreements to which it may be a party.

3.   The Guarantor hereby unconditionally and irrevocably guarantees to the
     Affiliate, as a primary obligor, the due and punctual performance of all
     of the obligations of the Operator under or in connection with the
     Operating Agreement. If the Operator fails to perform any such obligation
     in the manner and at the time required, the Guarantor shall perform or
     procure the performance of such obligation upon demand by the Affiliate.


- ----------------------

(1) Add or delete spaces as appropriate to reflect the number of Contractors.


   111



4.   This Guarantee is irrevocable and unconditional and shall remain in full
     force and effect until all obligations of the Operator under or in
     connection with the Operating Agreement are fully and irrevocably satisfied
     and discharged, notwithstanding (a) any amendment or termination of the
     Operating Agreement, (b) any extension of time or other indulgence or
     concession granted by the Affiliate, or (c) any delay or failure by the
     Affiliate in pursuing any remedies available against the Operator. 
     Notwithstanding the foregoing, this Guarantee shall terminate with respect
     to liabilities arising from improper abandonment of wells or facilities in
     any area outside a Field or in any Field on the fifth anniversary of the
     termination of the Operating Agreement with respect to such area or Field.

5.   The provisions contained in Article 547 of the Commercial Code of Venezuela
     will be fully applicable to this Guarantee. Accordingly, the Affiliate
     shall have no obligation to pursue any remedy or take any action against or
     in respect of the Operator prior to enforcing its rights under this
     Guarantee directly against the Guarantor. In addition, the Guarantor may
     not claim that the Affiliate could have avoided or mitigated, in any manner
     or through any action, the damages resulting from a default of the Operator
     under the Operating Agreement or resort to any other guarantee held at any
     time in its favor, before proceeding against the Guarantor in connection
     with its obligations under this Guarantee. The Guarantor's obligations
     under this Guarantee shall be independent and absolute, and the Guarantor
     shall have no right of set-off or counterclaim with respect to any other
     claims it may have against the Affiliate or any other Person,

6.   All of the obligations of the Guarantor set forth herein shall bind the
     Guarantor and its successors. The Guarantor may not assign or delegate its
     duties or obligations hereunder without the prior written consent of the
     Affiliate, and any purported assignment or delegation without such consent
     shall be null and void. The Guarantor confirms that this Guarantee shall
     remain in effect with respect to any assignee of the Operator under the
     Operating Agreement that is an Associated Entity of the Operator. Upon any
     such assignment the assignee shall be considered the Operator for all
     purposes hereunder to the extent of the assigned obligations. The Guarantor
     additionally confirms that any assignee of the Affiliate under the
     Operating Agreement permitted in accordance with Clause 27.3 of the
     Operating Agreement may exercise all rights and remedies of the Affiliate
     under this Guarantee. No other person or entity shall be a beneficiary of
     this Guarantee or have or acquire any rights by reason of this Guarantee.

7.   This Guarantee shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela.

8.   Any failure or delay by the Affiliate to exercise any right, in whole or in
     part, hereunder shall not be construed as a waiver of the right to exercise
     the same or any other right.

9.   No amendment or modification of this Guarantee shall be effective unless in
     writing and signed by the Affiliate and the Guarantor.

10.  Any dispute concerning the legal interpretation or construction of this
     Guarantee shall be settled exclusively and finally by arbitration conducted
     in accordance with the Rules of the




                                        2


   112
     International Chamber of Commerce ("ICC"). The Affiliate shall select an
     arbitrator and the Guarantor shall select an arbitrator in accordance with
     the ICC Rules. The arbitrators so nominated shall then agree within 30 days
     on a third arbitrator to serve as Chairman. The arbitration shall be
     conducted in New York City (United States of America). Notwithstanding the
     foregoing, in the event that a dispute involves both the Guarantor and the
     Operator, arbitration shall be conducted in accordance with Clause 23.2 of
     the Operating Agreement, and the Guarantor and the Operator shall jointly
     have the rights of the Operator under such Clause 23.2.

11.  The Guarantor shall pay upon demand and presentation of invoices all
     reasonable and actual costs and expenses incurred by the Affiliate in
     connection with the successful enforcement of this Guarantee, including,
     without limitation, reasonable fees and expenses of counsel.

12.  All notices, demands, instructions, waivers or other communications to be
     provided pursuant to this Guarantee, and any consents contemplated in this
     Guarantee, shall be in writing in Spanish or English, shall be effective
     upon receipt, and shall be sent by personal delivery, courier, first class
     mail, facsimile or telex, to the following addresses:

     i)  If to the Guarantor, to:



     ii) If to the Affiliate, to:



     The addresses and telex and facsimile numbers of either party for notices
     given pursuant to this Guarantee may be changed by means of a written
     notice given to the other party at least 15 Business Days prior to the
     effective date of such change.

13.  This Guarantee is being executed in both the Spanish language and the
     English language. The Spanish version shall constitute the binding version,
     and the English version is being executed as a matter of reference only.

14.  This Guarantee may be executed in any number of counterparts, each of which
     shall be deemed to be an original.





                                        3




   113



This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of
_______________, 1997.


                                         [NAME OF GUARANTOR]

                                         By:
                                            ------------------------------
                                         Name:
                                              ----------------------------
                                         Title:
                                               ---------------------------

ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   -----------------------------
Name:
     ---------------------------
Title:
      --------------------------




                                       4
   114

ANNEX K

[TRANSLATION]


                      MODEL JOINT OPERATING TERMS FOR EPIC

                                       I

                                   DEFINITIONS(1)


     Capitalized terms defined in the Agreement (as defined below) or the
     Accounting Procedures (as defined in the Agreement) have the respective
     meanings assigned to such terms therein. The following definitions are in
     addition to and supplement those set forth in the Agreement and the
     Accounting Procedures.

     "Agreement" shall mean the Operating Agreement to which these Model Terms
     are an Annex.

     "Advances" shall mean each payment of cash made or required to be made
     pursuant to a valid Cash Call.

     "Cash Call" shall mean any request for payment made by the Operator in
     accordance with Article IV of these Model Terms.

     "Contractor Agreement" shall mean any agreement or contract, whether oral
     or written, among some or all of the Other Contractors or between the Other
     Contractors and the Operator (in its capacity as such) with respect to
     their respective rights or obligations under the Agreement, as such
     agreement or contract may be amended or supplemented from time to time.

     "Joint Bank Account" shall have the meaning set forth in Article 4.1.

     "Management Committee" shall have the meaning set forth in Article 6.1.

     "Model Terms" shall mean these Model Joint Operating Terms for EPIC, as
     they may be amended or supplemented from time to time.

- ----------------------

(1)  Definitions in this English translation are presented in alphabetical order
     in English for ease of reference. Accordingly, the order of these
     definitions does not match the order in the definitive Spanish version.




   115

     "Permitted Expenditures" shall mean:

          (i)  Chargeable Expenditures;

          (ii) other expenditures that (a) relate to and are necessary for the
               provision of Operating Services or other activities under the
               Agreement, (b) are also paid by the Other Contractor(s), and (c)
               are of a kind and in amounts that are customarily charged to
               contractors under international joint operating agreements; and

         (iii) other expenditures that EPIC agrees to pay.

                                       II

                                      SCOPE

     Absent express written agreement to the contrary by EPIC, these Model Terms
     shall govern relations between EPIC and the Operator and EPIC and the Other
     Contractors and shall create a binding contractual relationship,
     enforceable against each of them in accordance with its terms.

     Except as the Other Contractors and/or the Operator may agree, these Model
     Terms will not affect any Contractor Agreement or any other aspect of
     relations between or among the Other Contractors and/or the Operator.

                                      III

                               NON-DISCRIMINATION

     As a general matter, in all matters relating to the Agreement and the
     Contractors' rights and obligations thereunder, the Operator and the Other
     Contractors shall not discriminate against EPIC, shall afford EPIC the same
     rights, access to information and other benefits as are enjoyed by Other
     Contractors under any Contractor Agreement or otherwise (taking into
     account the level of EPIC's Participation) and shall treat EPIC no less
     favorably than any Other Contractor with the same Participation is or would
     be treated by the Operator and/or Other Contractors under a Contractor
     Agreement or otherwise; provided that, unless it expressly agrees to the
     contrary in writing, EPIC shall at all times be entitled to the minimum
     rights, benefits and treatment provided in these Model Terms.

                                       IV

                       BANK ACCOUNTS; CASH CALLS; DEFAULT

4.1  (a) If it has not already done so, the Operator shall establish and 
     maintain one or more bank accounts (the "Joint Bank Accounts") in Dollars 
     (and in Bolivars, if there are Cash



                                        2
   116



     Calls in Bolivars), into which Advances and the Service Fee will be
     deposited and from which Permitted Expenditures will be paid by or
     reimbursed to the Operator. Payments of the Service Fee shall be held in a
     Joint Bank Account in Dollars and distributions of net amounts to EPIC
     shall be made in Dollars.

     (b) The Operator shall distribute cash from a Joint Bank Account to EPIC in
     proportion to EPIC's Participation in the Field (or, in the case of any
     reimbursement of unused Advances, Exploration Activity) concerned, at the
     same time as it distributes any cash from such Joint Bank Account to any
     Other Contractor (including the Operator itself in its capacity as a
     Contractor).

     (c) The Joint Bank Accounts shall be managed and Cash Calls made with a
     goal of minimizing the amount of idle cash in the Joint Bank Accounts, to
     the extent consistent with the needs of the Operator to perform the
     Operating Services contemplated in the Agreement.

4.2  The Operator shall make Cash Calls to EPIC in accordance with the
     procedures set forth herein to provide for the orderly funding by EPIC of
     its Participation in Permitted Expenditures. Cash Calls may be made by the
     Operator to fund any Permitted Expenditures. Cash Calls in respect of each
     Field or Exploration Activity may be made to EPIC in proportion to its
     respective Participation in the Field or Exploration Activity concerned
     only at the same time and in the same manner that Cash Calls with respect
     to the Permitted Expenditures concerned are made to all Other Contractors
     having a Participation in such Field or Exploration Activity. In addition,
     all Cash Calls to EPIC will be subject to the following conditions:

          (i) No later than fourteen calendar days prior to the beginning of
          each calendar month, the Operator shall furnish EPIC with a notice of
          (a) the Cash Call(s) being made for such calendar month and (b) an
          estimate of the Cash Calls that will be made for the three following
          calendar months. The amount requested in the Cash Call notice for any
          month shall be the Operator's estimate of the amount and currencies
          that will be payable in such calendar month in respect of the relevant
          Permitted Expenditures, taking into account cash already on hand and
          net of any Service Fee that the Operator expects to receive in such
          calendar month (to the extent that the Operator nets the Service Fee
          with respect to the Other Contractors), plus a reserve for
          contingencies in amounts consistent with normal industry practice.
          Each Cash Call notice sent to EPIC shall specify the amount applicable
          to each Field and to each Exploration Activity relevant to EPIC. Each
          Cash Call notice shall identify the budget items or AFE's (or main
          groupings of budget items or AFE'S) for which the funds are required
          and the amounts attributable to each such budget item or AFE (or
          grouping thereof).

          (ii) Cash Call(s) made in such notice for the coming calendar month
          shall be paid by EPIC no later than the first Business Day of such
          calendar month or such later Business Day as may be specified in the
          notice. Where Cash Calls are for




                                        3
   117


          more than $1.0 million (or the equivalent in another currency), EPIC
          will have the right to pay the Cash Calls in two or more installments
          during the course of the month in implementation of the principle
          stated in Article 4.1(c); provided that the timing of payment is
          consistent with the Operator's needs for funding.

          (iii) With respect to any Cash Calls made to the Other Contractors
          (or in the case of a single Other Contractor, any Permitted
          Expenditures actually made by such Other Contractor) prior to the date
          of execution and delivery of the Agreement by EPIC, EPIC shall pay the
          Operator its Participation in such Cash Calls (or such Permitted
          Expenditures) on the first Business Day that is or follows the latest
          of: (a) 30 calendar days following the date EPIC executes and delivers
          the Agreement, (b) five Business Days following receipt of an
          appropriate Cash Call notice from the Operator, and (c) the date on
          which such Cash Call is to be paid by the Other Contractors.

          Where the Other Contractors have paid a Cash Call (or a single Other
          Contractor has made a Permitted Expenditure) prior to the date on
          which EPIC pays its Participation in such Cash Call (or Permitted
          Expenditure), EPIC shall also pay interest on the amount of such
          Participation from and including the date of payment by the Other
          Contractor(s) to but excluding the date of payment by EPIC, at a rate
          for each day equal to *.

          (iv) Cash Calls to EPIC may be made only in Bolivars or Dollars. Each
          Cash Call shall specify, in respect of each Advance, the currency
          required and the Joint Bank Account to which payment is to be made.
          Payments of all Cash Calls shall be made to such Joint Bank Account,
          in funds available for withdrawal by the Operator on the date on which
          the payments are due. Whenever a Cash Call is made in Bolivars or
          Dollars for a funding need in another currency, the Operator shall
          purchase the appropriate amount of the required currency with Bolivars
          or Dollars, as the case may be, in an arms' length transaction from a
          bank of international reputation.

4.3       In the event that amounts are payable in respect of Permitted 
          Expenditures for which a Cash Call may be made by the Operator, and
          there is not sufficient cash on hand Advanced by the relevant
          Contractors to meet such Permitted Expenditures, the Operator shall
          give notice to each of EPIC and the relevant Other Contractors
          requesting that it fund its Participation in a special Cash Call. If
          EPIC elects not to provide such funding or does not respond in a
          timely manner, the Operator may advance EPIC's Participation in such
          amounts, if the Operator could; if necessary, simultaneously advance
          the respective Participations of the relevant Other Contractors.
          Amounts so advanced on behalf of EPIC shall be included in the Cash
          Call to EPIC for the next month (or for the following month, if the
          latest date for the notification of a Cash Call for the next month has
          passed before the date of such advance). The Operator shall receive
          interest on each such advance from and including the date of the
          advance, to but excluding the date of reimbursement, at a rate for
          each day in such period equal to the lower of (i) the lowest rate
          charged any Other

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



                                       4
   118
          Contractor with respect to advances made at the same time and (ii)
          LIBOR for such day. The related Cash Call shall include an amount
          sufficient to pay such interest.

4.4       (a) All Cash Calls made by the Operator shall be paid by EPIC,
          regardless of whether it disputes the correctness of such Cash Calls.
          If the Operator makes an improper Cash Call in bad faith or repeatedly
          makes improper Cash Calls, such error or errors shall constitute a
          breach by the Operator of its obligations under these Model Terms,
          Payment of any Advance will not prejudice EPIC's right to protest or
          question the correctness of the related Cash Call.

          (b) EPIC shall have the right to require that one audit of Permitted
          Expenditures, Cash Calls, Advances, Joint Bank Accounts and related
          matters be performed in any Calendar Year, at its own expense, by a
          firm of independent auditors of recognized international standing with
          expertise in Venezuelan accounting principles. Such audit may cover
          any or all such matters relating to the current Calendar Year or the
          two preceding Calendar Years. EPIC shall give at least 30 days' notice
          to the Operator of its intention to conduct such an audit. Audits
          shall be conducted in a manner so as to minimize disruptions to the
          Operator's activities. The Operator shall cooperate with the auditors,
          including providing access to all relevant facilities during regular
          business hours and providing appropriate assistance to the auditors.

          Notwithstanding the previous paragraph, if the items as to which EPIC
          requests an audit have already been audited once as part of the annual
          audit required by Clause 18.3 of the Agreement and Article 3.1 of the
          Accounting Procedures and a second time as part of an additional audit
          requested either by the Affiliate pursuant to Article 3.2 of the
          Accounting Procedures or by one or more Other Contractors pursuant to
          a Contractor Agreement or otherwise, EPIC will not have the right to
          require a third audit.

4.5       (a) If EPIC fails to pay any Cash Call when due, the Operator or any
          Other Contractor may give EPIC a notice of default. EPIC will have
          five Business Days from the giving of such notice in which to make up
          the Cash Call without penalty. If it fails to make up the Cash Call
          within such five Business Days, (i) EPIC will lose the right to
          receive distributions of the Service Fee and the Operator will be
          entitled to apply any Service Fees payable to EPIC to the amount of
          the unpaid Cash Calls, and (ii) the net amount of such unpaid Cash
          Calls (after application of the Service Fee) will subsequently bear
          interest, at a rate for each day equal to *, from and including the
          date such amount was originally due to but excluding the earlier of
          (1) the date of payment of such amount, (2) the date of transfer of
          EPIC's Participation as provided in Article 4.5(b), and (3) the date
          of withdrawal by EPIC with respect to the Field concerned pursuant to
          Clause 20.4 of the Agreement. If any portion of a Cash Call remains
          unpaid 30 calendar days after such notice of default, EPIC will lose
          the right to vote on any Management Committee (but will not lose its
          right to receive information pursuant to Article V). Upon payment in
          full of all unpaid Cash Calls and interest thereon, EPIC's rights to
          receive the Service Fee and to vote will be immediately reinstated.

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       5
   119

          (b) At any time that the amount of such missed Cash Call plus interest
          thereon remains unpaid following 120 calendar days after the end of
          the five-Business Day period referred to in the previous paragraph,
          the Operator shall have the right, but not the obligation, to give
          notice to EPIC requiring EPIC to transfer its Participation in the
          Field(s) or Exploration Activity to which the missed Cash Call relates
          to the Other Contractors in such proportions as the Operator shall
          indicate in the notice, without payment of any compensation or
          consideration of any kind to EPIC. To this end, upon receipt of such
          notice, EPIC shall be deemed to have transferred all of its right,
          title and beneficial interest in and under the Agreement to such Other
          Contractors and to have empowered the Operator to execute on EPIC's
          behalf any documents required to effect such transfer. If requested,
          EPIC will execute a power of attorney in this regard and will do any
          and all acts required by applicable law or regulation in order to
          complete such transfer. In the event that any necessary governmental
          or other approvals are not timely obtained, EPIC shall hold its
          Participation concerned in trust for the Other Contractors designated
          in the Operator's notice of transfer. Upon the effectiveness of the
          transfer of EPIC's Participation as provided above, EPIC will cease to
          be a Contractor under the Agreement with respect to the Field or
          Exploration Activity concerned,

          For purposes of Clause XXVII of the Agreement, the Affiliate will be
          deemed to have approved the Transfers provided above in advance and no
          further approval by the Affiliate will be required.

          (c) Transfer of EPIC's Participation in the Field(s) or Exploration
          Activity concerned pursuant to Article 4.5(b) will not relieve EPIC of
          the obligation to pay the Operator the amount of the missed Cash Call
          together with interest thereon or of liability for any other
          obligations, financial or otherwise, that have vested, matured or
          accrued under the Agreement prior to such transfer.

4.6       Unless it otherwise agrees, EPIC shall have no liability in respect
          of late or missed Cash Calls to Other Contractors.

                                       V

                              ACCESS TO INFORMATION

5.1       Subject to Article 7.2(c)(2), the Operator and the Other Contractors
          shall promptly provide EPIC with copies of all documents,
          communications, reports, notices and other information that are
          provided to,or received from, the Affiliate, any Other Contractor or
          any ministry or agency of the Venezuelan government in connection with
          the Agreement, including without limitation the following:

               (i) preliminary and final versions of any Development Plan,
               Annual Work Program and Budget, AFE, proposal for an Exploration
               Activity or Final Well Report, and of any significant amendments
               thereto; and




                                       6
   120

               (ii) any significant commentary disagreement, dispute, approval,
               response or other communications with regard to any of such
               documents;

     provided that magnetic tapes may be stored by the Operator and made
     available for inspection and/or copying at the expense of EPIC.

5.2  In addition, to the extent not already included under Article 5.1, the
     Operator shall promptly provide EPIC with copies of

               (i) all data and reports that are produced or compiled under the
               Uniform Reporting System;

               (ii) all monthly and annual reports produced pursuant to Article
               II of the Accounting Procedures;

               (iii) all audits and related information done or produced
               pursuant to Article III of the Accounting Procedures; and

               (iv) such additional information as EPIC may reasonably request,
               provided that it pays the costs of preparation of such additional
               information.

5.3  In general, the Operator shall afford EPIC access at all reasonable times
     to all facilities and installations used in connection with the Operating
     Services and to other data, information and documents acquired or produced
     in the conduct of the Operating Services and permit EPIC to make copies
     thereof at its own expense.

5.4  Notwithstanding the other provisions of this Article V, neither the
     Operator nor any Other Contractor shall be required to divulge proprietary
     technology to EPIC; provided that where the cost of development of
     proprietary technology has been included as a Permitted Expenditure to
     which EPIC has contributed, such proprietary technology shall be disclosed
     to EPIC and may be used by EPIC in other operations.

                                       VI

                           PARTICIPATION IN COMMITTEES

6.1  EPIC shall have the right to nominate one representative and one alternate
     representative to each operating committee, technical committee or similar
     body (each a "Management Committee") that is composed of representatives of
     the Contractors and has powers and duties with regard to authorizing and
     supervising Operating Services and other activities relating to the
     Agreement. EPIC shall have the right to change its representative and
     alternate at any time by giving notice to such effect to the Operator and
     the Other Contractors. EPIC shall be entitled to receive all notices and
     information (including, without limitation, proposed authorizations for
     expenditure) and to participate in meetings




                                       7
   121

     on the same basis as the Other Contractors, and to a vote on each
     Management Committee equal to its Participation from time to time.

6.2  If an operating committee and a technical committee have not already been
     formed pursuant to a Contractor Agreement or otherwise, the Other
     Contractor(s), the Operator and EPIC shall create an operating committee
     and technical committee, which shall each meet at least twice per year and
     shall have such powers and duties and operate according to such procedures
     as are customary in the international oil industry. The Operator shall
     provide EPIC with such notices, information and proposed authorizations for
     expenditure as are customary in the international oil industry.

6.3  If the requirements of Articles 6.1 or 6.2 are satisfied, decisions of the
     Management Committee concerned shall be conclusive and binding on EPIC to
     the extent that such decisions are also conclusive and binding on all Other
     Contractors; provided that (i) EPIC shall have no liability with respect to
     any activity or matter as to which it gives notice nonconsent under
     Articles 7.2(a), 7.3(a) or 7.4, and (ii) a Management Committee may not
     amend the Agreement or these Model Terms or modify EPIC's rights thereunder
     or hereunder without EPIC's written consent.

                                       VII

                PARTICIPATION IN FIELD DEVELOPMENTS; EXPLORATION
                     ACTIVITIES AND CERTAIN OTHER ACTIVITIES

7.1  Subject to its right to withdraw pursuant to Clause 20.4 of the Agreement
     and its right to transfer its Participation in a Field pursuant to Clause
     XXVII of the Agreement, EPIC shall be liable for its share of all
     Chargeable Expenditures relating to the Initial Field and for all other
     Permitted Expenditures reasonably related to such Field, and shall be
     entitled to its share of the Service Fee with respect to such Initial
     Field, for the entire Operation Period of such Initial Field. It shall
     otherwise have no right to withhold consent or otherwise to opt out of
     Operating Services performed with respect to the Initial Field.

7.2  (a) Subject to Article 7.2(c), EPIC shall have the right to participate in
     any Exploration Activity that is proposed to the Affiliate pursuant to
     Clause VIII of the Agreement. The Operator shall promptly give EPIC notice
     of any such proposal. At any time within the 10 calendar days following
     such notice (or within 48 hours if the proposed Exploration Activity
     involves use of a drilling rig that is standing by) EPIC may notify the
     Operator that it does not wish to participate in such Exploration Activity.
     Absent such notification of non-consent, EPIC will be deemed to have
     approved such Exploration Activity and will be liable for its Participation
     in all Permitted Expenditures in connection with such Exploration Activity,

     (b) In the event that EPIC notifies the Operator that it does not wish to
     participate in such an Exploration Activity, it will have no liability for
     any Permitted Expenditures or any



                                       8
   122
     other liabilities incurred in connection with such Exploration Activity.
     Thereafter, each of the Other Contractors participating in such Exploration
     Activity will indemnify EPIC from, and hold it harmless against, any costs,
     expenses (including without limitation reasonable legal costs, expenses and
     attorneys' fees) and liabilities incident to claims, demands or causes of
     action of every kind and character brought by or on behalf of any Person,
     for damage to or loss of property or the environment, or for injury to,
     illness or death of any Person, in each case to the extent such costs,
     expenses and liabilities arise from or are related to such Exploration
     Activity,

     (c) In the event that EPIC elects not to participate in an Exploration
     Activity as provided above, it will be deemed to have conclusively
     relinquished to the Other Contractors (1) all rights to participate in such
     Exploration Activity and in any additional exploration, appraisal or
     drilling activity that results directly therefrom, (2) all rights under
     these Model Terms to receive data or information relating to or resulting
     from such Exploration Activity or additional activities, and (3) all rights
     under the Agreement to have a Participation in the development of any
     Hydrocarbons discovered or appraised as a result of such Exploration
     Activity or additional activities,

     (d) Notwithstanding the provisions of Article 7.2(c), if any non-consenting
     Other Contractor has the option under a Contractor Agreement or otherwise
     to reinstate any of the rights described in Article 7.2(c), EPIC shall have
     the same option on the same terms and subject to the same conditions as
     such Other Contractor.

     (e) Further notwithstanding the provisions of Article 7.2(c), if an
     Exploration Activity in which EPIC does not participate leads either (1) to
     the development of a new Field whose development also results from
     Exploration Activities in which EPIC does participate or (2) to the
     extension of an existing Field in which EPIC has a Participation, EPIC
     shall have the option to have a Participation in the development of such
     new Field equal to its Participation in the Exploration Activities in which
     it did participate or to maintain its Participation in the existing Field.
     Such option shall be exercisable by giving notice to the Operator at any
     time during the 30 calendar days following the approval by the Affiliate of
     a Development Plan for such new Field or an amendment of the Development
     Plan for the existing Field.

     If EPIC gives such notice, it will be required to pay the Operator the full
     amount of its Participation in each Cash Call for Exploration Expenditures
     and other Permitted Expenditures related to the Exploration Activities in
     which EPIC did not participate, that was addressed to the Other Contractors
     prior to the date of such notice and has not already been paid by EPIC.
     The amount of each such Cash Call shall be paid to the Operator on the
     first Business Day that is or follows the latest of: (a) 30 calendar days
     following the date of such notice, (b) five Business Days following receipt
     of an appropriate Cash Call notice from the Operator, and (c) the date on
     which any such Cash Call is to be paid by the Other Contractors.



                                       9
   123

     If Other Contractors have paid such a Cash Call prior to the date on which
     EPIC pays its Participation in such Cash Call, EPIC shall also pay interest
     on the amount of such Participation from and including the date of payment
     by the Other Contractors to but excluding the date of payment by EPIC, at a
     rate for each day equal to LIBOR plus 1%.

7.3  (a) Subject to Article 7.2(c), EPIC shall have a Participation in any
     development proposed pursuant to Clause 8.4 of the Agreement, that
     corresponds to its Participation in the Exploration Activities that lead to
     such development, unless it notifies the Affiliate and the Operator at any
     time prior to approval of the related Development Plan by the Affiliate
     that it does not wish to participate in such development. Absent such
     notification, and subject to its right to withdraw pursuant to Clause 20.4
     of the Agreement and its right to transfer its Participation in a Field
     pursuant to Clause XXVII of the Agreement, EPIC shall be liable for its
     share of all Chargeable Expenditures, and be entitled to its share of the
     Service Fee, with respect to the Field concerned for the entire Operation
     Period of such Field. It shall Otherwise have no right to withhold consent
     or otherwise to opt out of Operating Services performed with respect to
     such Field.

     (b) In the event that EPIC notifies the Operator that it does not wish to
     participate in such Development Plan, it will have no liability for any
     Chargeable Expenditures or any other liabilities incurred in connection
     with such Development Plan or such Field after the giving of such notice.
     Thereafter, each of the Other Contractors participating in such Development
     Plan will indemnify EPIC from, and hold it harmless against, any costs,
     expenses (including without limitation reasonable legal costs, expenses and
     attorneys' fees) and liabilities incident to claims, demands or causes of
     action of every kind and character brought by or on behalf of any Person,
     for damage to or loss of property or the environment, or for injury to,
     illness or death of any Person, in each case to the extent such costs,
     expenses and liabilities arise from or are related to such Development Plan
     or the conduct of any activities with respect to such Field.

7.4  EPIC shall have the right to participate on the same terms and conditions
     as any Other Contractors (including the right to receive its pro rata share
     of any revenues realized in addition to the Service Fee), with a
     Participation equal to the largest Participation it then has with respect
     to a Field under the Agreement, in:

          (i) any infrastructure projects proposed pursuant to Clause 15.3 of
          the Agreement;

          (ii) any Natural Gas development negotiated pursuant to Clause XVI of
          the Agreement; and 

          (iii) any acquisition, construction or operation of any other
          facilities, installations or other assets which are to be used partly
          in connection with the Operating Services and partly in connection
          with other operations or to provide services to third parties.



                                       10
   124
                                      VIII

                           TRANSFER OF PARTICIPATIONS

8.1  Absent express written agreement to the contrary with one or more Other
     Contractors, EPIC will not be subject to, or have the benefit of, any
     restrictions on Transfers of Participations existing with respect to some
     or all of the Other Contractors under any Contractor Agreement (such as
     rights of first refusal, rights of first negotiation, "piggyback" rights,
     and other similar rights).

8.2  In any event, EPIC will be subject to the provisions of Clause XXVII of the
     Agreement, except as specifically provided to the contrary in Clause 3.3 of
     the Agreement.

                                       IX

                                 MISCELLANEOUS

9.1  These Model Terms shall be governed by and construed in accordance with the
     laws of the Republic of Venezuela. Disputes between EPIC and the Operator
     or any Other Contractor shall be resolved as provided in Clause 23.2 of the
     Agreement.

9.2  All notices, demands, instructions, waivers, consents or other
     communications to be provided pursuant to these Model Terms shall be given
     as provided in Clause XXVII of the Agreement,

9.3  To be binding, any amendment of these Model Terms must be effected by an
     instrument in writing signed by EPIC, the Operator and the Other
     Contractors. No further formalities shall be required to amend these Model
     Terms.

9.4  Rights hereunder may not be waived, except pursuant to a writing signed by
     the Party against which enforcement of the waiver is sought.

9.5  Notwithstanding anything to the contrary contained in these Model Terms, in
     no event shall any Party be liable to any other Party for any consequential
     damages or lost profits that such other Party might suffer. The Parties
     acknowledge that this provision is intended only to limit their liability
     to each other for consequential loss or damage and lost profits, and shall
     not be construed to so as to limit their liability to third parties or
     their right to seek indemnification for third party claims in accordance
     with any other Clause.

     The Operator and each Other Contractor shall indemnify EPIC from, and hold
     it harmless against, any loss, damage, cost or expense (including without
     limitation reasonable legal costs, expenses and attorneys' fees) incurred
     as a result of or arising from the gross negligence or willful misconduct
     respectively of the Operator or such Other Contractor in connection with
     activities relating to the Agreement,



                                       11
   125


     EPIC shall indemnify the Operator and each Other Contractor from, and hold
     it harmless against, any loss, damage, cost or expense (including without
     limitation reasonable legal costs, expenses and attorneys' fees) incurred
     as a result of or arising from the gross negligence or willful misconduct
     of EPIC in connection with activities relating to the Agreement.

     In the event that EPIC pays, or is held liable for, any cost, loss, damage
     or expense (other than EPIC's own costs of litigation) arising out of or in
     relation to any of the Operating Services or any other activity under the
     Agreement (including, without limitation, as a result of settlement of
     third party claims), that is in excess of EPIC's Participation in the
     Operating Services or activity giving rise to such cost, loss, damage or
     expense, each Other Contractor that pays, or is held liable for, a part of
     the total cost, loss, damage or expense that is less than its Participation
     in such Operating Services or activity shall promptly upon notice from EPIC
     pay to EPIC the amount of the shortfall. Similarly, EPIC shall be liable
     for contribution to some or all of the Other Contractors if it pays, or is
     held liable for, less than its Participation in any such cost, loss, damage
     or expense.

9.6  Nothing contained in these Model Terms or in the Agreement is intended to
     create, or shall be deemed or construed as creating, any legal entity
     between the Parties. No Party shall have the authority or right, or hold
     itself out as having the authority or right, to assume, create or undertake
     any obligation of any kind whatsoever, express or implied, on behalf of or 
     in the name of any other Party, except as expressly provided herein.



                                       12


   126
ANNEX L

[TRANSLATION]


                                 PRICE FORMULA


     For purpose of Clause 17.4 of the Agreement, the value of Hydrocarbons
other than Associated Gas for each calendar day in any given Quarter will be
determined in accordance with the appropriate formula set forth below.

     The average price for purposes of Clause 17.4 will be the arithmetic mean
of the prices for each calendar day in the Quarter, except Saturdays, Sundays,
and legal holidays in the place where price quotation referred to below is
taken, carried to three decimal places with fractions of 0.0005 or more being
rounded up.  If a quotation used in the applicable formula is unavailable for
any particular day, the most recent available quotation will be used.  

A. Liquid Hydrocarbons

1. For Liquid Hydrocarbons having an API gravity of 28 degrees or greater,

         *

2. For Liquid Hydrocarbons having an API gravity of 22 degrees to 27.9 degrees,

         *

3. For Liquid Hydrocarbons having an API gravity of 15 degrees to 21.9 degrees,

         *

4. For Liquid Hydrocarbons having an API gravity of 10 degrees to 14.9 degrees,

         *

*  Confidential portions of this page and pages 2, 3, 4, 5 and Exhibit 1 on
   this Annex L have been omitted pursuant to a request for confidential 
   treatment and filed separately with the Commission.







   127
*

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.



                                       2



   128



     In the event that Platt's Oilgram Price Report at any time ceases to be
published or is otherwise unavailable, the Affiliate and the Contractors shall
agree on an alternative source of price information for the index crudes
concerned.  If any such index is unavailable from any source or if the
composition of such index changes so that it is no longer substantially
equivalent to the index as of the Effective Date, the Affiliate and the
Contractors shall agree on a new index or indexes, and on corresponding
modifications of the appropriate Price Formula as set forth above, so that such
new index(es) and modified Price Formula yield substantially the same
historical results as the initial index(es) and Price Formula.

     If the Affiliate and the Contractors are unable to agree on either (i)
whether one of the circumstances described in the preceding paragraph has
occurred, or (ii) the appropriate solution to such circumstance, within 60 days
following notification by one side to the other that agreement on such a matter
is required, either the Affiliate or the Contractors will have the right to
refer such matter to an independent expert for decision pursuant to Clause 23.3
of the Agreement.  The decision of the independent expert will be final and
binding.  Unless otherwise agreed by the Parties, the independent expert's
decision will be strictly limited to the matters described in the preceding
paragraph and no other issue relating to the Price Formula may be submitted for
independent expert review.


B. Natural Gas (except Associated Gas)

1. For Natural Gas from Cretacico Sur,

     *

2. For Natural Gas from La Concepcion,

     *

3. For Natural Gas from La Vela Costa Afuera,

     *

*  Confidential portion has been omitted pursuant to a request for confidential
   treatment and filed separately with the Commission.


                                       3
   129
*































* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
   130

     *

     In the event that an official price for Natural Gas or high sulfur fuel
oil is no longer established for the relevant Venezuelan market pursuant to
government regulation, then for purposes of determining P(001) or FOP, as the
case may be, for the above formulae, the Affiliate and the Contractors shall
agree on an index or other source of price information that most accurately
indicates the actual, average daily selling price for Natural Gas or high
sulfur fuel oil, as the case may be, for industrial uses, that is charged by
the Affiliate or other major suppliers on the open market in the relevant
location, under term contracts.

     If the Affiliate and the Contractors are unable to agree on either (i)
whether one of the circumstances described in the preceding paragraph has
occurred, or (ii) the appropriate solution to such circumstance, within 60 days
following notification by one side to the other that agreement on such a matter
is required, either the Affiliate or the Contractors will have the right to
refer such matter to an independent expert for decision pursuant to Clause 23.3
of the Agreement. The decision of the independent expert will be final and
binding.  Unless otherwise agreed by the Parties, the independent expert's
decision will be strictly limited to the matters described in the preceding
paragraph and no other issue relating to the Price Formula may be submitted for
independent expert review.

* Confidential portion has been omitted pursuant to a request for
  confidential treatment and filed separately with the Commission.

                                       5
   131
Exhibit 1

               VALUES OF K(LCH) FOR PURPOSES OF THE PRICE FORMULAS



- ------------------------------------------------
                     K(LCH) IN $/BARREL FOR
AREAS                INITIAL DELIVERY POINTS
- ------------------------------------------------
                  
Acema                          *  
- ------------------------------------------------
Ambrosio                       *  
- ------------------------------------------------
Bachaquero S. O.               *  
- ------------------------------------------------
Boqueron                       *
- ------------------------------------------------
B2X-68/79                      *
- ------------------------------------------------
B2X-70/80                      *
- ------------------------------------------------
Cabimas                        *
- ------------------------------------------------
Caracoles                      *
- ------------------------------------------------
Casma-Anaco                    *
- ------------------------------------------------
Cretacico Sur                  *
- ------------------------------------------------
Dacion                         *
- ------------------------------------------------
Intercampo N.                  *
- ------------------------------------------------
Kaki                           *
- ------------------------------------------------
La Concepcion                  *
- ------------------------------------------------
La Vela Costa Afuera           *
- ------------------------------------------------
LL-652                         *
- ------------------------------------------------
Mata                           *
- ------------------------------------------------
Maulpa                         *
- ------------------------------------------------
Mene Grande                    *
- ------------------------------------------------
Onado                          *
- ------------------------------------------------


* Confidential portion has been omitted pursuant to a request for confidential
  treatment and filed separately with the Commission.
   132
ANNEX M

[Translation]

               [FORM OF GUARANTEE FOR MINIMUM WORK OBLIGATION](1)

         Reference is made to the Operating Agreement (the "Agreement") of even
date herewith among [name of Affiliate] (together with its successors and
assigns, the "Affiliate"), a sociedad anonima organized under the laws of the
Republic of Venezuela, ____________________ (the "Guaranteed Entity"), a
___________________ organized under the laws of ____________________ and
___________________ a ____________________ organized under the laws of
___________________, and ____________________, a ____________________ organized
under the laws of ____________________.

         ____________________ (the "Guarantor"), a ___________________ organized
under the laws of ____________________, and an Associated Entity of the
Guaranteed Entity, hereby agrees as follows:

1.       Capitalized terms used herein and not otherwise defined shall have the
         meanings set forth in the Agreement.

2.       The Guarantor hereby expressly represents and warrants to the
         Affiliate that:(i) it is duly organized, validly existing and in good
         standing under the laws of its jurisdiction of organization, (ii) it
         has all requisite corporate power and authority to execute, deliver
         and perform this Guarantee, (iii) the execution, delivery and
         performance of this Guarantee have been duly authorized by all
         necessary corporate action, (iv) this Guarantee constitutes the legal,
         valid and binding obligation of the Guarantor, enforceable against the
         Guarantor in accordance with its terms, (v) no governmental
         approvals are required in connection with the execution, delivery and
         performance of this Guarantee, except as have been obtained and are in
         force, and (vi) the execution, delivery and performance of this
         Guarantee by the Guarantor will not violate any provision of any
         existing law or regulation to which the Guarantor is subject or any
         provision of the Guarantor's constitutive documents or of any material
         agreements to which it may be a party.

3.       The Guarantor hereby unconditionally and irrevocably guarantees to the
         Affiliate, as primary debtor and obligor, the payment of the
         Guaranteed Amount (as defined below) if the Minimum Work Obligation is
         not completed by the earlier of (i) the date of termination of the
         Agreement and (ii) the date that is [ ](2) years following the
         Takeover Date (in either case, the

- -------------
(1)      This Guarantee may be provided in lieu of the letter of credit by
         bidders whose direct or indirect parent companies qualified in
         Category "A" or "B" in the Third Operating Agreement Round.

(2)      Insert the number of years specified in the Final Tender Protocol for
         the completion of the Minimum Work Obligation.
   133


         "Completion Date"). The "Guaranteed Amount" shall initially be equal
         to U.S.$ _______.(3) The Guaranteed Amount shall be reduced no
         earlier than three months after the date of this Guarantee, and no
         more frequently than every three months thereafter, by the amount
         specified in a certificate duly executed by the Affiliate in the form
         attached hereto as Exhibit 1. The Guaranteed Amount shall be reduced
         to zero upon the execution by the Affiliate of a Certificate in the
         form attached hereto as Exhibit 2.
         
4.       In the event that the Minimum Work Obligation is not completed by the
         Completion Date, no later than three Business Days after written
         demand by the Affiliate, the Guarantor shall pay the Guaranteed Amount
         as of the Completion Date, in U.S. dollars, by wire transfer of
         immediately available funds to the account specified by the Affiliate.
         In the event that the Guarantor disputes any such demand, the
         Guarantor shall nonetheless pay the amount demanded, and, in the event
         that the dispute is resolved in the Guarantor's favor, the Affiliate
         shall repay the excess amount paid by the Guarantor, together with
         interest at a reasonable rate to be determined by mutual agreement by
         the Affiliate and the Guarantor or, if such agreement is not reached
         by the time an arbitral tribunal appointed pursuant to Clause 12 of
         this Guarantee makes an award, to be determined by the arbitral
         tribunal.

5.       This Guarantee shall expire and shall be of no further force or effect
         if no demand for payment is made hereunder pursuant to Clause 4 within
         six months following the Completion Date, except that this Guarantee
         shall be reinstated and be in full force and effect if, and to the
         extent that, the Guaranteed Entity makes any payment to the Affiliate
         in respect of an amount guaranteed hereunder and such payment, or any
         portion thereof, is required to be returned to the Guaranteed Entity
         in accordance with any applicable bankruptcy, insolvency or similar
         law.

6.       This Guarantee is irrevocable and unconditional and shall remain in
         full force and effect to the extent of the Guaranteed Amount at any
         given time, notwithstanding (a) any amendment or termination of the
         Agreement, (b) any extension of time or other concession granted by
         the Affiliate, or (c) any delay or failure by the Affiliate in
         pursuing any actions or remedies available against the Guarantor
         hereunder (except as provided in Clause 5) or against the Guaranteed
         Entity for failure to complete the Minimum Work Obligation or
         otherwise.

7.       The provisions contained in Article 547 of the Commercial Code of
         Venezuela will be fully applicable to this Guarantee. Accordingly, the
         Affiliate shall have no obligation to pursue any remedy or take any
         action against or in respect of the Guaranteed Entity prior to
         enforcing its rights under this Guarantee directly against the
         Guarantor. In addition, the Guarantor may not claim that the Affiliate
         could have avoided or mitigated, in any manner or through any action,


- --------------

(3)      The amount to be included will be equal to the product of the
         Guaranteed Entity's Participation, and the value of the Minimum Work
         Obligation set forth in Section 4.4 of the Agreement. The value of the
         Minimum Work Obligation for each Area is set forth in the Final Tender
         Protocol.


                                       2
   134

         the damages resulting from the Guaranteed Entity's failure to complete
         the Minimum Work Obligation, or resort to any other guarantee held at
         any time in its favor, before proceeding against the Guarantor in
         connection with its obligations under this Guarantee. The Guarantor's
         obligations under this Guarantee shall be independent and absolute,
         and the Guarantor shall have no right of set-off or counterclaim with
         respect to any other claims it may have against the Affiliate or any
         other Person.

8.       All of the obligations of the Guarantor set forth herein shall bind
         the Guarantor and its successors and permitted assigns. The Guarantor
         may not assign or delegate its duties or obligations hereunder without
         the prior written consent of the Affiliate, and any purported
         assignment or delegation without such consent shall be null and void.
         The Guarantor confirms that this Guarantee shall remain in effect with
         respect to any assignee of the Guaranteed Entity under the Agreement
         that is an Associated Entity of the Guaranteed Entity, and upon any
         such assignment the assignee shall be considered the Guaranteed Entity
         for all purposes hereunder to the extent of the assigned obligations.
         The Guarantor additionally confirms that any permitted assignee of all
         of the Affiliate's rights and obligations under Clause 27.3 of the
         Agreement may exercise all rights and remedies of the Affiliate under
         this Guarantee. No other person or entity shall be a beneficiary of
         this Guarantee or have or acquire any rights by reason of this
         Guarantee.

9.       This Guarantee shall be governed by and construed in accordance with
         the laws of the Republic of Venezuela.

10.      Any failure or delay by the Affiliate to exercise any right, in whole
         or in part, hereunder shall not be construed as a waiver of the right
         to exercise the same or any other right.

11.      No amendment or modification of this Guarantee shall be effective
         unless in writing and signed by the Guarantor and the Affiliate.

12.      Any dispute concerning the legal interpretation or construction of
         this Guarantee shall be settled exclusively and finally by
         arbitration. The arbitration shall be conducted in accordance with the
         Rules of the International Chamber of Commerce ("ICC"). The Affiliate
         shall select an arbitrator and the Guarantor shall select an
         arbitrator in accordance with the ICC Rules. The arbitrators so
         nominated shall then agree within 30 days on a third arbitrator to
         serve as Chairman. The arbitration shall be conducted in New York City
         (United States of America). Notwithstanding the foregoing, in the
         event that a dispute involves both the Guarantor and the Guaranteed
         Entity, arbitration shall be conducted in accordance with Clause 23.2
         of the Agreement, as a single proceeding, and the Guarantor and the
         Guaranteed Entity shall jointly have the rights of the Guaranteed
         Entity under such Clause 23.2.

13.      The Guarantor shall pay upon demand and presentation of invoices all
         reasonable and actual costs and expenses (including, without
         limitation, reasonable fees and expenses of counsel) incurred by the
         Affiliate in connection with the successful enforcement of this
         Guarantee.


                                       3
   135

14.      All notices, demands, instructions, waivers or other communications to
         be provided pursuant to this Guarantee, and any consents contemplated
         in this Guarantee, shall be in writing in Spanish or English, shall be
         effective upon receipt, and shall be sent by personal delivery,
         courier, first class mail, facsimile or telex, to the following
         addresses:

         i)  If to the Guarantor, to:

         ii) If to the Affiliate, to:

                 [Affiliate name]
                 [Affiliate address]

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Guarantee may be changed by means of a written notice
         given by the Affiliate or the Guarantor, as applicable, to the other
         at least 15 Business Days prior to the effective date of such change.

15.      This Guarantee is being executed in both the Spanish language and the
         English language. The Spanish version shall constitute the binding
         version, and the English version is being executed as a matter of
         reference only.

16.      This Guarantee may be executed in any number of counterparts, each of
         which shall be deemed to be an original.

This Guarantee has been duly executed by the Guarantor and the Affiliate by
their respective officers thereunto duly authorized as of the ___ day of ___,
1997.

                                              [NAME OF GUARANTOR]

                                              By:
                                                 -----------------------------
                                              Name:
                                                   ---------------------------
                                              Title:
                                                    --------------------------
ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By:
   -----------------------------
Name:
     ---------------------------
Title:
      --------------------------


                                       4
   136

                                                                       EXHIBIT 1


              [FORM OF AFFILIATE CERTIFICATE REDUCING GUARANTEED AMOUNT]

        Reference is made to the Guarantee (the "Guarantee"), dated as of _____,
1997, issued by __________, a __________, organized under the laws of _________,
relating to the Operating Agreement (the "Agreement"), dated as of _____, 1997,
among [name of Affiliate] ("the Affiliate") a sociedad anonima organized under
the laws of the Republic of Venezuela, __________, a __________ organized under
the laws of ______, and ________, a ____________ organized under the laws of
_________.  Capitalized terms used herein and not defined have the respective
meanings set forth in the Guarantee or, to the extent not defined therein, in
the Agreement.
                           
        The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:               

         (i)  The amount in U.S. dollars specified in (a) below is either (1) 
              the share allocable to the Guaranteed Entity of the amount that 
              has been spent by the Contractors on the Minimum Work Obligation
              through the date of this certificate, or (2) a 10% reduction in
              the existing Guaranteed Amount due to Exploracion y Produccion
              EPIC, S.A. becoming a Party to the Agreement; and
        
         (ii) The Guaranteed Amount is to be reduced to the amount specified
              in (b) below, effective upon the execution of this certificate.

(a) Share or Dollar Amount Spent on                $_______________
Minimum Work Obligation or Reduction due
to EPIC

(b) Remaining Guaranteed Amount                    $_______________

      This certificate has been duly executed by the undersigned as of the ___
day of ________ , 199__.

                                        [NAME OF AFFILIATE]

                                        

                                        By:
                                           -------------------------
                                        Name: 
                                        Title:



                                   5
   137



                                                                      EXHIBIT 2

               [FORM OF AFFILIATE CERTIFICATE AS TO COMPLETION]

       Reference is made to the Guarantee (the "Guarantee"), dated as of
__________, 1997, issued by __________, a __________, organized under the laws 
of _________,  relating to the Operating Agreement (the "Agreement"), dated as
of_________, 1997, among [name of Affiliate] ("the Affiliate"), a sociedad
anonima organized under the laws of the Republic of Venezuela, _________, a
___________ organized under the laws of __________, and ____________, a
__________ organized under the laws of __________. Capitalized terms used herein
and not defined have the respective meanings set forth in the Guarantee or, to
the extent not defined therein, in the Agreement.             

       The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:                         

         (i)     The Minimum Work Obligation has been completed by the
                 Contractors; and

         (ii)    The Guaranteed Amount is to be reduced to zero, effective upon
                 the execution of this certificate.

                 This certificate has been duly executed by the undersigned as
of the __________ day of 199__.

                                                [NAME OF AFFILIATE]


                                                By:
                                                   -------------------------
                                                Name:
                                                Title:




                                      6
   138

ANNEX M-2


[Translation]

          [FORM OF FINANCIAL UNDERTAKING FOR MINIMUM WORK OBLIGATION]

         Reference is made to the Operating Agreement (the "Agreement") of even
date herewith among [name of Affiliate] (together with its successors and
assigns, the "Affiliate"), a sociedad anonima organized under the laws of the
Republic of Venezuela, __________ (the "Undertaking Contractor"), a __________ 
organized under the laws of __________, and __________, a __________ organized
under the laws of __________.

         With respect to the obligations assumed by the Undertaking Contractor
under the Agreement, the Undertaking Contractor hereby agrees as follows: 

1.  Capitalized terms used herein and not otherwise defined shall have the
    meanings set forth in the Agreement.

2.  The Undertaking Contractor hereby unconditionally and irrevocably 
    undertakes the payment of the Face Amount (as defined below) to the
    Affiliate if the Minimum Work Obligation is not completed by the earlier of
    (i) the date of termination of the Agreement and (ii) the date that is
    [ ](2) years following the Takeover Date (in either case, the "Completion
    Date"). The "Face Amount" shall initially be equal to U.S. $_______(3). The
    Face Amount shall be reduced no earlier than three months after the date of
    this Financial Undertaking, and no more frequently than every three months
    thereafter, by the amount specified in a certificate duly executed by the
    Affiliate in the form attached hereto as Exhibit 1. The Face Amount shall be
    reduced to zero upon the execution by the Affiliate of a Certificate in the
    form attached hereto as Exhibit 2.


- ------------------

(1) This Financial Undertaking may be provided in lieu of the letter of credit
    by pre-qualified companies who qualified financially under Categories "A" or
    "B" in the Third Operating Agreement Round and who will be signing the
    Operating Agreement directly (and not through an Associated Entity or
    Jointly Held Company).

(2) Insert period for completion of the Minimum Work Obligation from the Final 
    Tender Protocol.  

(3) The amount to be included will be equal to the product of the Undertaking
    Contractor's Participation, and the value of the Minimum Work Obligation set
    forth in Section 4.4 of the Agreement. The value of the Minimum Work
    Obligation for each Area is set forth in the Final Tender Protocol.
   139


3.       In the event that the Minimum Work Obligation is not completed by the
         Completion Date, no later than three Business Days after written demand
         by the Affiliate, the Undertaking Contractor shall pay the Face Amount
         as of the Completion Date, in U.S. dollars, by wire transfer of
         immediately available funds to the account specified by the Affiliate.
         In the event that the Undertaking Contractor disputes any such demand,
         it shall nonetheless pay the amount demanded, and, in the event that
         the dispute is resolved in the Undertaking Contractor's favor, the
         Affiliate shall repay the excess amount paid by the Undertaking
         Contractor, together with interest at a reasonable rate to be
         determined by mutual agreement by the Affiliate and the Undertaking
         Contractor or, if such agreement is not reached by the time an arbitral
         tribunal appointed pursuant to Clause 11 of this Financial Undertaking
         makes an award, to be determined by the arbitral tribunal.

4.       This Financial Undertaking shall expire and shall be of no further
         force or effect if no demand for payment is made hereunder pursuant to
         Clause 3 within six months following the Completion Date.

5.       The Financial Undertaking is irrevocable and unconditional and shall
         remain in full force and effect to the extent of the Face Amount at any
         given time, notwithstanding (a) any amendment or termination of the
         Agreement, (b) any extension of time or other concession granted by the
         Affiliate, or (c) any delay or failure by the Affiliate in pursuing any
         actions or remedies available against the Undertaking Contractor
         hereunder (except as provided in Clause 4) or under the Agreement for
         failure to complete the Minimum Work Obligation or otherwise.

6.       The Undertaking Contractor may not claim that the Affiliate could have
         avoided or mitigated, in any manner or through any action, the damages
         resulting from the Undertaking Contractor's failure to complete the
         Minimum Work Obligation, or resort to any guarantee held at any time in
         its favor, before proceeding against the Undertaking Contractor in
         connection with its obligations under this Financial Undertaking. The
         Undertaking Contractor's obligations under this Financial Undertaking
         shall be independent and absolute, and the Undertaking Contractor shall
         have no right of set-off or counterclaim with respect to any other
         claims it may have against the Affiliate or any other Person.

7.       All of the obligations of the Undertaking Contractor set forth herein
         shall bind the Undertaking Contractor and its successors and permitted
         assigns. The Undertaking Contractor may not assign or delegate its
         duties or obligations hereunder without the prior written consent of
         the Affiliate, and any purported assignment or delegation without such
         consent shall be null and void. The Undertaking Contractor agrees that
         in the event of any assignment under the Agreement to an Associated
         Entity of the Undertaking Contractor, it shall replace this Financial
         Undertaking with a guarantee in the form of Annex M-1 to the
         Agreement. The Undertaking Contractor additionally confirms that any
         permitted assignee of all of the Affiliate's rights and obligations
         under Clause 27.3 of the Agreement may exercise all rights and remedies
         of the Affiliate under this Financial Undertaking. No other person or
         entity shall be a beneficiary of this Financial Undertaking or have or
         acquire any rights by reason of this Financial Undertaking.

                                           2
   140

8.       The Financial Undertaking shall be governed by and construed in
         accordance with the laws of the Republic of Venezuela.

9.       Any failure or delay by the Affiliate to exercise any right, in whole
         or in part, hereunder shall not be construed as a waiver of the right
         to exercise the same or any other right.

10.      No amendment or modification of this Financial Undertaking shall be
         effective unless in writing and signed by the Undertaking Contractor
         and the Affiliate.

11.      Any dispute concerning the legal interpretation or construction of this
         Financial Undertaking shall be settled exclusively and finally by
         arbitration. The arbitration shall be conducted in accordance with the
         ICC Rules. The Affiliate shall select an arbitrator and the Undertaking
         Contractor shall select an arbitrator in accordance with the ICC Rules.
         The arbitrators so nominated shall then agree within 30 days on a third
         arbitrator to serve as Chairman. The arbitration shall be conducted in
         New York City (United States of America).

12.      The Undertaking Contractor shall pay upon demand and presentation of
         invoices all reasonable and actual costs and expenses (including,
         without limitation, reasonable fees and expenses of counsel) incurred
         by the Affiliate in connection with the successful enforcement of this
         Financial Undertaking.

13.      All notices, demands, instructions, waivers or other communications to
         be provided pursuant to this Financial Undertaking, and any consents
         contemplated in this Financial Undertaking, shall be in writing in
         Spanish or English, shall be effective upon receipt, and shall be sent
         by personal delivery, courier, first class mail, facsimile or telex, to
         the following addresses:             

         i)  If to the Undertaking Contractor, to:

         ii) If to the Affiliate, to:

                 [Affiliate name]
                 [Affiliate address]

         The addresses and telex and facsimile numbers for notices given
         pursuant to this Financial Undertaking may be changed by means of a
         written notice given by the Affiliate or the Undertaking Contractor,
         as applicable, to the other at least 15 Business Days prior to the
         effective date of such change.

14.      This Financial Undertaking is being executed in both the Spanish
         language and the English language. The Spanish version shall constitute
         the binding version, and the English version is being executed as a
         matter of reference only.                                

15.      This Financial Undertaking may be executed in any number of
         counterparts, each of which shall be deemed to be an original. 


                                           3

   141

This Financial Undertaking has been duly executed by the Undertaking
Contractor and the Affiliate by their respective officers thereunto
duly authorized as of the ___ day __________________,of 1997.

                                         [NAME OF UNDERTAKING CONTRACTOR]

                                         By: 
                                            --------------------------
                                         Name: 
                                              ------------------------
                                         Title:
                                               -----------------------


ACKNOWLEDGED AND ACCEPTED:

[NAME OF AFFILIATE]

By: 
   --------------------------
Name: 
     ------------------------
Title:
      -----------------------



                                           4
   142

                                                                       EXHIBIT 1

            [FORM OF AFFILIATE CERTIFICATE REDUCING FACE AMOUNT]

         Reference is made to the Financial Undertaking (the "Financial
Undertaking"), dated as of ________________, 1997, issued by _______________,
a ______________, organized under the laws of ________________, relating to the
Operating Agreement (the "Agreement"), dated as of __________________, 1997,
among [name of Affiliate] ("the Affiliate"), a sociedad anonima organized under
the laws of the Republic of Venezuela, __________________, a __________________ 
organized under the laws of ___________________, and ___________________, a
________________ organized under the laws of ________________. Capitalized terms
used herein and not defined have the respective meanings set forth in the
Financial Undertaking or, to the extent not defined therein, in the Agreement.

         The undersigned, being duly authorized to execute this certificate on
behalf of the Affiliate, hereby certifies that:

         (i)     The amount in U.S. dollars specified in (a) below is either
                 (1) the share allocable to the Undertaking Contractor of the
                 amount that has been spent by the Contractors on the Minimum
                 Work Obligation through the date of this certificate, or (2) a
                 10% reduction in the existing Face Amount due to Exploracion
                 y Produccion EPIC, S.A. becoming a Party to the Agreement; and

         (ii)    The Face Amount is to be reduced to the amount specified in
                 (b) below, effective upon the execution of this certificate.

(a) Share of Dollar Amount Spent on             $ _______________
Minimum Work Obligation or Reduction due
to EPIC

(b) Remaining Face Amount                       $ _______________

                 This certificate has been duly executed by the undersigned as
of the ___ day of _______________ 199__.


                                        [NAME OF AFFILIATE]

         
                                         By: 
                                            --------------------------
                                         Name: 
                                         Title:
                        
         
         
                                      5
   143

                                                                       EXHIBIT 2

              [FORM OF AFFILIATE CERTIFICATE AS TO COMPLETION]

             Reference is made to the Financial Undertaking (the "Financial
Undertaking"), dated as of _________________, 1997, issued by ________________
a __________________, organized under the laws of _______________, relating to
the Operating Agreement (the "Agreement"), dated as of __________________, 1997,
among [name of Affiliate] ("the Affiliate"), a sociedad anonima organized under
the laws of the Republic of Venezuela, _________________, a ________________
organized under the laws of __________________, and ___________________, a 
___________________ organized under the laws of ________________. Capitalized
terms used herein and not defined have the respective meanings set forth in the
Financial Undertaking or, to the extent not defined therein, in the Agreement.
                                                                       
             The undersigned, being duly authorized to execute this certificate 
on behalf of the Affiliate, hereby certifies that:

        (i)     The Minimum Work Obligation has been completed by the
                Contractors; and

        (ii)    The Face Amount is to be reduced to zero, effective upon the
                execution of this certificate.

                This certificate has been duly executed by the undersigned as 
of the ____ day of ______________, 199__.



                                         [NAME OF AFFILIATE]



                                         By: 
                                            --------------------------
                                         Name: 
                                         Title:
         



                                      6
   144

                                    ANNEX N
                                AVAILABLE ASSETS
                                 BOQUERON AREA

         ASSETS TO BE OPERATED BY THE OPERATOR

         1.      BOQ-1 I flow station.

         2.      La Toscana manifold inlet.

                                     N-1

   145

ANNEX 0

[Translation]
  
  
            [FORM OF LETTER OF CREDIT FOR MINIMUM WORK OBLIGATION)

                    IRREVOCABLE STAND-BY LETTER OF CREDIT

                           Issued by [Name of Bank]


Date:___________
No.:____________


[Name of Affiliate]
[Affiliate Address)


Dear Sirs:

         1. [Name of Bank], a __________ organized under the laws of _________
(the "Issuer"), hereby establishes in favor of (name of Affiliate] (the
"Affiliate"), a sociedad anonima organized under the laws of the Republic of
Venezuela, its Irrevocable Standby Letter of Credit No. ______________ (this
"Letter of Credit"), whereby the Issuer authorizes the Affiliate to draw
hereunder, in a single drawing, the Face Amount of this Letter of Credit as of
the date of drawing (determined in the manner set forth in Clause 3 of this
Letter of Credit) by presentation of a Draft and a Drawing Certificate (each as
defined below) at the Issuer's office specified in Clause 5 of this Letter of
Credit, during the Drawing Period (as defined below).

         2. This Letter of Credit is being established in accordance with the
Operating Agreement (the "Agreement "), dated ______, 1997, between the
Affiliate, [Contractor #1], a ____________ organized under the laws of
__________, and [Contractor #2], a _____________ organized under the laws of
__________.(1) Capitalized terms used herein (including in the Exhibits hereto)
and not defined have the respective meanings set forth in the Agreement.

         3. The Face Amount of this Letter of Credit shall initially be U.S.
$__________. The Face Amount shall be reduced upon presentation by the Affiliate
to the Issuer of a certificate                                            

- ---------------

(1)  Add or delete spaces as appropriate to reflect the number of Contractors.


   146


(a "Reduction Certificate"), in the form set forth in Exhibit 1 hereto,
specifying a new, lower Face Amount. A Reduction Certificate may be presented to
the Issuer, and the Face Amount may be reduced, no more frequently than once
every three months, beginning three months after the date of this Letter of
Credit.

         4. The Face Amount of this Letter of Credit may be drawn by the
Affiliate in the manner specified in Clause 5 of this Letter of Credit on any
Banking Day during the period (the "Drawing Period") beginning at 9:00 a.m., New
York City time, on __________, 19 ____,(2) and ending at 5:00 p.m., New York 
City time, on __________, ____.(3) A "Banking Day" is any day other than a
Saturday, a Sunday or day on which commercial banks in New York City are
authorized or required by law, regulation or executive order to close.   

         5. A drawing may be made hereunder only by the presentation by the
Affiliate to the Issuer of a sight draft of the Affiliate drawn on the Issuer in
the form attached hereto as Exhibit 2 (a "Draft"), and a certificate executed by
the Affiliate in the form attached hereto as Exhibit 3 (a "Drawing
Certificate"). Presentation of a Draft and Drawing Certificate must be made at
the Issuer's office in New York City located at __________, or at such other
address in New York City as the Issuer may designate to the Affiliate by notice
given in accordance with Clause 10 of this Letter of Credit.          

         6. Upon the presentation by the Affiliate to the Issuer during the
Drawing Period of the Draft and Drawing Certificate at the office of the Issuer
designated pursuant to such Clause 5, the Issuer shall pay the Face Amount as of
the date of presentation, by wire transfer of immediately available funds to the
Affiliate's account with a financial institution in New York City designated in
the Drawing Certificate. If presentation is duly made at or prior to 11:00 a.m.,
New York City time, on any Banking Day, payment shall be made by the Issuer at
or prior to 5:00 p.m., New York City time, on the same Banking Day. If
presentation is duly made after 11:00 a.m., New York City time, on any Banking
Day, payment shall be made by the Issuer at or prior to 1:00 p.m., New York City
time, on the immediately following Banking Day.

         7. This Letter of Credit shall expire upon the earliest of (i)
_______,(4) (ii) the reduction of the Face Amount of this Letter of Credit to
zero, (iii) the date on which the Affiliate presents to the Issuer a certificate
executed by the Affiliate in the form attached hereto as Exhibit 4 (a
"Completion Certificate"), and (iv) the indefeasible payment by the Issuer to
the Affiliate in the manner set forth in Clause 6 of this Letter of Credit of
the Face Amount upon a drawing properly made hereunder.  Notwithstanding the
foregoing, any drawing properly made

- --------------


(2)  Insert the date of the Effective Date.

(3)  Insert the date that is six months after the last day of the period set 
     forth in Clause 4.3 of the Agreement.  

(4)  Insert the date of the expiration of the Drawing Period.

                                      2
   147
hereunder prior to the expiration of this Letter of Credit shall be honored by
the Issuer. Notwithstanding anything contained in Article 17 of the Uniform
Customs (defined below) or herein, in the event that the Issuer's office
designated in Clause 5 of this Letter of Credit is closed on the date set forth
in (i) of this Clause 7, the expiration date of this Letter of Credit and the
Drawing Period shall be extended to the next Banking Day on which such office is
open.

         8. This Letter of Credit may only be drawn by, and other rights
hereunder may only be exercised by, the Affiliate, unless and until the Issuer
receives a certificate in the form attached hereto as Exhibit 5 (a "Transfer
Certificate") from the Affiliate designating a Person that is an assignee of
the rights and obligations of the Affiliate under Clause 27.3 of the Agreement.
Upon the delivery of a Transfer Certificate by the Affiliate to the Issuer, the
assignee named in the Transfer Certificate (and only such assignee) shall be
considered "the Affiliate" for all purposes hereunder (including for purposes of
this Clause 8). This Letter of Credit is a "transferable credit" within the
meaning of Article 48(a) of the Uniform Customs, and may be transferred in
accordance with this Clause 8, notwithstanding anything to the contrary
contained in Article 48(g) of the Uniform Customs.                       

         9. This Letter of Credit is subject to the Uniform Customs and Practice
for Documentary Credits (1993 Revision), International Chamber of Commerce
Publication No. 500 (the "Uniform Customs"). As to matters not covered by the
Uniform Customs, this Letter of Credit shall be governed by, and construed in
accordance with, the laws of the State of New York, including without limitation
Article 5 of the Uniform Commercial Code as in effect in the State of New York.
                                                                        
         10. All notices, demands, instructions, waivers or other communications
to be provided pursuant to this Letter of Credit shall be in writing in English,
shall be effective upon receipt, and shall be sent by personal delivery,
courier, first class mail, facsimile or telex, to the following addresses: 

         i)  If to the Issuer, to:


                                      3

   148

         ii) If to the Affiliate, to:

                         [Affiliate name] 
                         [Affiliate address]

The addresses and telex and facsimile numbers for notices given pursuant to this
Letter of Credit may be changed by the Issuer or the Affiliate by means of a
written notice given to the other at least 15 Banking Days prior to the
effective date of such change.

         11. This Letter of Credit sets forth in full the Issuer's undertaking,
and such undertaking shall not in any way be modified or amended by reference to
any document, instrument or agreement referred to herein, except the Draft, the
Drawing Certificate, any Transfer Certificate, any Completion Certificate and
any Reduction Certificate.                                                    

                                         Very truly yours,

                                         [NAME OF BANK]

                                         By:
                                            ----------------------------
                                         Name:
                                         Title:



                                      4
   149
                                                                       EXHIBIT 1


                        (FORM OF REDUCTION CERTIFICATE)

                          Reference is made to the Irrevocable Standby Letter of
Credit (the "Letter of Credit"), No.             dated            , issued by
             in favor of the Affiliate. Capitalized terms used herein and not 
defined have the respective meanings set forth or incorporated by reference in 
the Letter of Credit.

                 The undersigned, being duly authorized to execute this
certificate on behalf of the Affiliate, hereby certifies that:

         (i)     The amount in U.S. dollars specified in (a) below is either
                 (1) the share allocable to the Face Amount of the Letter of
                 Credit of the amount that has been spent by the Contractors on
                 the Minimum Work Obligation through the date of this
                 certificate, or (2) a 10% reduction in the existing Face
                 Amount of the Letter of Credit due to Exploracion y Produccion
                 EPIC, S.A. becoming a Party to the Agreement; and

         (ii)    The Face Amount of the Letter of Credit is to be reduced to an
                 amount equal to the Remaining Face Agreement specified in (b)
                 below, effective as of the date of this certificate set forth
                 below.

(a) Share of Dollar Amount Spent on                $_______________
Minimum Work Obligation or Reduction
due to EPIC

(b) Remaining Face Amount                          $________________

         This certificate has been duly executed by the undersigned as of the
__________ day of________, 199_.

                                        [NAME OF AFFILIATE]

                                        By:
                                           ------------------------
                                        Name: 
                                        Title:


                                       5
   150

                                                                       EXHIBIT 2

                                [FORM OF DRAFT]

                          Letter of Credit No._______
                              [New York, New York]
                                [Date of Draft]

At sight

PAY TO THE ORDER OF [NAME OF Affiliate](1) the sum of U.S. $__________
(_______________ U.S. Dollars), FOR VALUE RECEIVED. DRAWN UNDER [NAME
OF ISSUER] IRREVOCABLE STANDBY LETTER OF CREDIT NO.                 .

                                        [NAME OF AFFILIATE](1)

                                        By:
                                           --------------------------- 
                                        Name:
                                        Title:

To: [Name of Issuer].
    [Address of Issuer]



- ----------------

(1) If the Letter of Credit is assigned pursuant to Clause 8 of the Letter of
Credit, substitute the name of the assignee.
   151

                                                                       EXHIBIT 3



                         [FORM OF DRAWING CERTIFICATE]

                Reference is made to the Irrevocable Standby Letter of Credit
(the "Letter of Credit"), No. ____________ dated _____________, issued by
________ in favor of [name of Affiliate]. Capitalized terms used herein and not
defined have the respective meanings set forth or incorporated by reference in
the Letter of Credit.

                 The undersigned, being duly authorized to execute this
certificate on behalf of the Affiliate, hereby certifies that:

         (i)     the Agreement has terminated without completion of the Minimum
                 Work Obligation;

         (ii)    the period specified for the completion of the Minimum Work
                 Obligation under Clause 4.3 of the Agreement has expired
                 without completion of the Minimum Work Obligation; or

         (iii)   the Minimum Work Obligation has not been completed by the
                 Contractors as of 15 days prior to [date](5) (the "Renewal
                 Date") and the Letter of Credit has not been either:

                 (a) amended to extend the last day of the Drawing Period to 
                 the last day of the period specified for the completion of the
                 Minimum Work Obligation in the first sentence of Clause 4.3 of
                 the Agreement (or, if such date is not known, a date at least 
                 two years following the Renewal Date); or

                 (b) replaced by a new irrevocable stand-by letter of credit 
                 that is (i) issue by [       ](6) or another bank or financial
                 institution having a branch in New York City, the long-term 
                 unsecured senior debt obligations of which are rated at least 
                 "A" by Standard & Poor's Ratings Group or by Moody's Investors
                 Services, Inc., (ii) payable at a branch of such bank or 
                 financial institution in New York City, (iii) in the form of 
                 the Letter of Credit (except for relevant dates), (iv) 
                 provides for a Drawing Period that ends on the last day of the
                 period specified for the completion of the Minimum Work
                 Obligation in the first sentence of Clause 4.3 of the
                 Agreement (or, if such date is not known, a date at least two
                 years following the Renewal Date), and (v) in an amount equal
                 to the Face Amount of the Letter of Credit as of the Renewal
                 Date.

- ---------------

(5)Insert the last day of the Drawing Period set forth in Clause 4 of the
   Letter of Credit.

(6)Insert name of the Issuer of the Letter of Credit.


                                       7
   152
         Payment of the current Face Amount of the Letter of Credit is to be
made by the Issuer to the following account:


                 [insert details for account in New York City]


         This certificate has been duly executed by the undersigned as of the
_____ day of _________ 199__.

                                            [NAME OF AFFILIATE]

                                            By:
                                               ------------------------------
                                            Name:
                                            Title:




                                       8
   153
                                                                       EXHIBIT 4

                        [FORM OF COMPLETION CERTIFICATE]

        Reference is made to the Irrevocable Standby Letter of Credit (the
"Letter of Credit") No. ________, dated ________, issued by in favor of [name of
Affiliate]. Capitalized terms used herein and not defined have the respective
meanings set forth or incorporated by reference in the Letter of Credit.

        The undersigned, being duly authorized to execute this certificate on 
behalf of the Affiliate, hereby certifies that:

         (i)     The Minimum Work Obligation has been completed by the
                 Contractors or the Letter of Credit has been replaced by an
                 irrevocable stand-by letter of credit as described in
                 paragraph (iii) (b) of the Drawing Certificate; and

         (ii)    The Letter of Credit shall expire as of the date of this
                 Certificate.

                 This certificate has been duly executed by the undersigned as
of the day of________ 199__.

                                        [NAME OF AFFILIATE]

                                        By:
                                           -------------------------- 
                                        Name:
                                        Title:



                                       9
   154
                                                                       EXHIBIT 5

                         [FORM OF TRANSFER CERTIFICATE]


         Reference is made to the Irrevocable Standby Letter of Credit (the
"Letter of Credit"), No. _________, dated ________, issued by ____________ in
favor of [name of Affiliate]. Capitalized terms used herein and not defined have
the respective meanings set forth or incorporated by reference in the Letter of
Credit.

        The undersigned, being duly authorized to execute this certificate on 
behalf of the Affiliate, hereby certifies that:

             (i)      The Affiliate has transferred its rights and
                      obligations under the Agreement to __________ (the
                      "Transferee"), a ________ organized under the laws of
                      __________; and
         
             (ii)     The Affiliate has transferred all of its rights
                      (including without limitation the rights described in
                      Article 48(d) of the Uniform Customs) under the
                      Letter of Credit to the Transferee.

        All notices, demands, instructions, waivers or other communications to
be provided to the Transferee pursuant to Clause 10 of the Letter of Credit
shall be sent to the following address:

                           [insert notice address]

        This certificate has been duly executed by the undersigned as of the
________ day of_______, 199__.

                                             [NAME OF AFFILIATE]

                                             By:    
                                                ----------------------     
                                             Name:
                                             Title:

                                       10

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