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                          OPERATING SERVICES AGREEMENT

     THIS AGREEMENT has been entered into and signed on the nineteenth (19th)
     day of November, 1993, by and between MARAVEN S.A., hereinafter called "THE
     AFFILIATE," represented herein by its President, Eduardo Lopez Quevedo,
     duly authorized by the Articles of Incorporation - Bylaws of THE AFFILIATE,
     and COMPANIA OCCIDENTAL HIDROCARBUROS, INC., hereinafter called "THE
     CONTRACTOR," a corporation incorporated and existing under the laws of
     California, represented herein by its President, Joseph F. Snape, duly
     authorized by Board Resolutions of THE CONTRACTOR dated November 4, 1993.

     1.   GENERAL PROVISIONS

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

          1.2  THE AFFILIATE has the exclusive right to carry on exploitation
               operations of the Hydrocarbons in all the area described in
               Appendix "A" and outlined in the Appendix "B", both annexed
               hereto, hereinafter called "Agreement Area."

          1.3  THE AFFILIATE wishes to promote the development of the Agreement
               Area, and THE CONTRACTOR wishes to render services within such
               area.

     LEGEND

     * Confidential portion has been omitted pursuant to a request for
       confidential treatment and filed separately with the Commission.
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          1.4  THE CONTRACTOR has the financial capacity, technical ability and
               professional expertise necessary to perform the Operating
               Services described hereunder.

          1.5  THE CONTRACTOR shall perform for THE AFFILIATE, but at the risk
               and cost of THE CONTRACTOR, those rehabilitation, development,
               production and other activities as are required to achieve the
               continuous commercial development of the Hydrocarbons which are
               present in the Agreement Area, as further specifically set forth
               hereunder and in the Work Program approved by THE AFFILIATE.

          It being understood that:

          a)   The compensation of THE CONTRACTOR for the services hereunder 
               shall only consist of such compensation established in Clause 8
               and shall not include any title to the Hydrocarbons found or
               produced in the Agreement Area.

          b)   The rights of THE CONTRACTOR arising from this Agreement do not 
               include any right to the economic benefits resulting from the
               sale or disposal by THE AFFILIATE of the Hydrocarbons extracted
               from the Agreement Area, but only to those economic interests, as
               may be granted hereunder as a contractor, for the operational
               activities thereof.




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          c)   The Agreement is entered into with THE CONTRACTOR by reason of
               its particular conditions, therefore, it is considered to be a
               contract intuito personae. As a result, THE CONTRACTOR may not
               merge, associate or modify either the organizational structure or
               its share participation without notifying THE AFFILIATE in
               writing at least three (3) months in advance to any of the
               above-mentioned situations and must provide THE AFFILIATE with
               any documents required thereby. THE CONTRACTOR will be informed
               by THE AFFILIATE if THE AFFILIATE considers that the occurrence
               of any of the above circumstances is not convenient to its
               interests concerning this Agreement, and if THE CONTRACTOR
               insists in carrying out the decision thereof notwithstanding the
               objection from THE AFFILIATE, THE AFFILIATE may terminate this
               Agreement and THE CONTRACTOR will have no right to file any
               claim.

     2.   DEFINITIONS

          The words and terms as used herein shall have the following meanings,
          irrespective of their being used in the singular or plural:

          2.1  Agreement: Means the Spanish version of this "Operating Services
               Agreement," together with Appendices "A", "B", "C", "D", "E" and
               "F", which are




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               incorporated hereto. The English version of the Agreement and its
               Appendices is used only as a reference and has no effect
               whatsoever.

          2.2  Agreement Area: Means the Area within the territory of Venezuela
               object of this Agreement, as described and outlined in Appendices
               "A" and "B".

          2.3  Agreement Year: Means a period of twelve (12) months starting on
               January 1st and ending the following December 31, according to
               the Gregorian Calendar. For the first year of the Agreement, the
               Agreement Year means the period commencing the Effective Date of
               the Agreement until December 31 of the following Gregorian
               Calendar year.

          2.4  Effective Date: Means the day this Agreement is signed.

          2.5  Associated Company: Means, with respect to a Party to this
               Agreement, a company or other entity controlling or being
               controlled by the Party; or a company controlling a company or
               other entity controlling or being controlled by such Party, it
               being understood that control means the ownership by a company or
               entity of at least fifty percent (50%) of: (a) the voting shares,
               if the company is a stock company; or (b) the controlling rights
               or interests,




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               if the other entity is not a stock company. Those companies or
               entities directly or indirectly controlled by a company or entity
               controlling one of the Parties shall also be considered an
               Associated Company.

          2.6  Starting Date of Operations: Means the date Appendix "F"
               (Operations Starting Certificate) is subscribed by THE CONTRACTOR
               and THE AFFILIATE. The Starting Date of Operations may not be
               later than four (4) months after the Effective Date.

          2.7  Day: Means a calendar day.

          2.8  Force Majeure: Means any event beyond the control of, and which
               is not a direct consequence of gross negligence or willful
               misconduct by the affected Party, including, but not limited to,
               Acts of God or of third parties; compliance with any request,
               ruling, order or decree of governmental authorities,
               substantially impeding the performance of the work as provided
               hereunder; war, rebellion, sabotage or riots; public insurrection
               or disorder; floods or volcanic eruptions, tidal waves,
               earthquakes, lightning, fires, explosions or other disasters;
               strikes or any other act agreed by the workers; or other similar
               occurrences beyond the control of the affected Party and that may
               not be avoided or





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               prevented by such Party exercising due diligence. Nonetheless,
               Force Majeure shall not include occurrences such as:

               a)   Late delivery of construction equipment or materials to be
                    supplied by THE CONTRACTOR, resulting from a congestion at a
                    plant of the manufacturer or any other place; a market
                    oversold condition, inefficiencies or similar occurrences,
                    or

               b)   Late performance by THE CONTRACTOR or its subcontractors
                    resulting from a shortage of supervisors, workforce,
                    inefficiencies or similar events and a shortage of services,
                    or

               c)   The lack of payment of monetary amounts or the congestion
                    or lack of transportation or storage capacity.

               The foregoing, except when said late delivery or late
               performance, described in paragraphs a) and b), or congestion or
               lack of capacity described in paragraph c), arise from Force
               Majeure [an event other than those described in paragraphs a), b)
               and c) above] which is beyond the control of affected Party, as
               well as the subcontractors, and an





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               acceptable alternative source of services, equipment or materials
               is not available.

          2.9  Production: Means the Hydrocarbons produced and regularly
               transferred to THE AFFILIATE at the Transfer Points and under
               the terms indicated in Appendix "A", as it may be modified from
               time to time by written agreement of the Parties ("Appendix
               "A"), on a regular basis, according to the Work Program approved
               by THE AFFILIATE, and that THE AFFILIATE is operationally
               capable of receiving. The reception of Hydrocarbons produced
               under the specifications of Appendix "A" shall only be refused
               in the event of Force Majeure.

          2.10 Audit of Environmental Situation: Means the determination of
               preexisting environmental conditions at the Starting Date of
               Operations.

          2.11 Production Date: Means the date when the Crude Oil Production
               begins, or, subject to Clause 7.7, the Natural Gas, which date,
               for the purposes of this Agreement, coincides with the Starting
               Date of Operations.

          2.12 Crude Oil: Means the oil or any other hydrocarbon in a liquid
               state at environmental conditions, including the liquid
               hydrocarbons extracted from natural gas.




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          2.13 Natural Gas: Means any gaseous hydrocarbon produced, including,
               without limitation, non-associated gas and wet gas, dry gas,
               casinghead gas and residual gas remaining after liquid
               hydrocarbons extraction from wet gas.

          2.14 Hydrocarbons: Means both Crude Oil and Natural Gas.

          2.15 Barrel: Means an amount or volumetric unit of Crude Oil of
               forty-two (42) United States gallons at a temperature of sixty
               degrees (60 degrees) Fahrenheit.

          2.16 Quarter: Means the period of three (3) months starting either on
               January 1, April 1, July 1 or October 1 of any Agreement Year.

          2.17 Current Quarter: Means the pertinent Quarter for purposes of
               invoicing and indexing adjustments as provided in Clause 18
               hereunder.

          2.18 Previous Quarter: Means the Quarter preceding the current
               Quarter.

          2.19 Crude Oil Transfer Points: Means the point of transfer to THE
               AFFILIATE of the risk, safeguard and custody of the Crude Oil
               produced in the Agreement Area, as defined in Appendix "A".




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          2.20 Gas Transfer Points: Means the point of transfer to THE AFFILIATE
               of the risk, safeguard and custody of the Natural Gas produced in
               the Agreement Area, as defined in Appendix "A".

          2.21 Operating Services: Means all drilling, geological studies and
               geophysical surveys, rehabilitation, development, extraction,
               production, treatment, hauling, maintenance and other operations
               authorized or contemplated hereunder.

          2.22 Work Program: Means an annual statement detailing the Operating
               Services to be performed in the Agreement Area, as approved by
               THE AFFILIATE from time to time, including the corresponding
               Budget.

          2.23 Minimum Work Program: Means the statement detailing the minimum
               commitment of Operating Services to be performed at the Agreement
               Area during the first three (3) Agreement Years, including the
               corresponding Budget, as established in Appendix "C".

          2.24 Budget: Means the estimate of all Capital and Non-Capital Costs
               included in the Work Program for the period concerned.




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          2.25 Capital and Non-Capital costs:

               Capital Costs: Means those expenditures incurred for the
               performance of the Operating Services established as such
               according to Clause 18 hereunder, Accounting Procedures, provided
               they are included in the approved Budget as Capital Costs, or
               have been approved in writing by THE AFFILIATE.

               Non-Capital Costs: Means those expenditures incurred for the
               performance of the Operating Services, established as such
               according to Clause 18 hereunder, provided that any such Non-
               Capital Costs have been incurred after the Production Date and
               are included in the approved Budget or have been approved in
               writing by THE AFFILIATE.

          2.26 Norms and Regulations: Any law, regulation and other provisions
               applicable to the activities to be performed by THE CONTRACTOR
               hereunder, including such normal operating practices of THE
               AFFILIATE, as have been notified to THE CONTRACTOR.

          2.27 Party: Means THE CONTRACTOR or THE AFFILIATE, as the case may be.




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          2.28 Applicable Law: Means all the laws of the Republic of Venezuela
               which will rule the interpretation, validity and compliance of
               this Agreement.

       3. DURATION OF AGREEMENT

          3.1  This Agreement shall be in effect for twenty (20) Agreement
               Years, as from the Effective Date. In the event there is no
               Production during the first three (3) Agreement Years, the
               Agreement shall fully automatically cease, except as otherwise
               provided herein.

          3.2  THE CONTRACTOR may request, in writing, the extension of the
               Agreement. Such request must be reasoned and submitted at least
               six (6) months in advance to the maturity of the term set forth
               in paragraph 3.1. THE AFFILIATE may grant or reject, in a
               reasonable manner, the extension, as well as put conditions to
               it.

          3.3  In the event there is no Production at the end of the first three
               (3) Agreement Years, but THE AFFILIATE and THE CONTRACTOR, after
               having considered all the pertinent operating and financial data,
               are of the opinion that Production may be achieved, the period of
               three (3) years described in paragraph 3.1 may be extended as
               agreed upon by the Parties in writing.




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       4. AUTOMATIC TERMINATION

          In the event that Production is interrupted at any moment after the
          first three (3) Agreement Years, for a period of six (6) consecutive
          months, except by reason of Force Majeure, the Agreement shall be
          automatically terminated, unless otherwise agreed upon by THE
          AFFILIATE and THE CONTRACTOR.

       5. WORK PROGRAM AND DISBURSEMENTS

          5.1  During the first thirty-six (36) months of the Agreement counted
               from the Starting Date of Operations, THE CONTRACTOR shall
               perform the Minimum Work Program set forth in Appendix "C".

               The total amount to be spent by THE CONTRACTOR to perform the
               operations during the referred first thirty-six (36) months, as
               provided hereunder, shall not, in the aggregate, be less than the
               amount specified below for each one of the three (3) periods of
               twelve (12) months:

               First twelve (12) months:               U.S.  * 

               Second twelve (12) months:              U.S.  * 

               Third twelve (12) months:               U.S.  *

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





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               To guarantee the Minimum Work Program, THE CONTRACTOR shall
               submit an irrevocable "Stand-By" Letter of Credit, in favor of
               THE AFFILIATE and issued or confirmed by a first-class bank
               previously approved by THE AFFILIATE. The Stand-By Letter of
               Credit must he based on the form established in Appendix "D".

               The amount of the Stand-By Letter of Credit will be reduced at
               the end of each Quarter following the Starting Date of
               Operations, pursuant to its terms. For this purpose, THE
               CONTRACTOR will report to THE AFFILIATE, within fifteen (15) Days
               from the end of each Quarter, the works performed and the amounts
               expended, with supporting documentation, in the performance of
               the Agreement. THE AFFILIATE, after checking the amounts and
               supporting documentation provided by THE CONTRACTOR, will order
               the corresponding bank to reduce the Letter of Credit by the
               amount actually expended, within fifteen (15) Days from receipt
               of said information. At THE AFFILIATE's request, THE CONTRACTOR
               must submit any additional supporting documentation, including,
               without limitation, any pertinent invoice, contract and document.
               THE AFFILIATE shall have the right to object to the amount
               reported by THE CONTRACTOR and the reduction of the Stand-By
               Letter of Credit by the objected amounts will be suspended until
               the objections are duly clarified by the Parties, without



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               prejudice of the reduction by THE AFFILIATE of the amounts not
               objected. Reductions made in accordance with this clause 5.1 will
               not be considered as a waiver by THE AFFILIATE of the right to
               submit an objection or claim in the future or to execute the
               outstanding balance of the Stand-By Letter of Credit with respect
               to works or amounts that further checking demonstrates should not
               have given rise to reduction already made, or of any other right
               that THE AFFILIATE may have with respect to said amounts.

               Default by THE CONTRACTOR of the Minimum Work Program and/or the
               above minimum expenditure commitments as provided herein shall
               give THE AFFILIATE the right, without prejudice to any other
               available right or remedy, to immediately execute the
               above-mentioned Letter of Credit for an amount representing the
               defaulted minimum guaranteed work commitment of THE CONTRACTOR.
               The amounts executed as provided herein shall, in no case, be
               reimbursed to THE CONTRACTOR, nor reduced, offset nor otherwise
               reduced for any reason whatsoever, including, without limitation,
               the receipt of any benefits by THE AFFILIATE, the mitigation of
               whatever damage caused by the default of the Minimum Work Program
               or the real or possible existence of any claim against third
               parties or THE AFFILIATE.




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          5.2  In the event that THE CONTRACTOR is unable to comply with the
               Minimum Work Program, THE AFFILIATE must be immediately informed
               in writing of the reasons causing the non-compliance, and, in
               such event, THE CONTRACTOR may be allowed by THE AFFILIATE to
               perform the defaulted portion of the Minimum Work Program, or
               make the pertinent disbursements during the following year.
               Should such situation arise at the end of the third Agreement
               Year, THE CONTRACTOR shall be able to obtain an extension of the
               "Stand-By" Letter of Credit for the additional term granted to
               finish the performance of the defaulted portion and for the
               amount corresponding to the defaulted commitment of the Minimum
               Work Program. THE AFFILIATE reserves the right to approve or
               refuse the request from THE CONTRACTOR to perform the unfinished
               portion of the Minimum Work Program during the following year,
               within a lapse of time considered to be convenient, without
               having to justify its decision.

               In the event that, during any Agreement Year following the first
               thirty-six (36) months, THE CONTRACTOR shall have performed less
               than the agreed Work Program, such unfinished portion, with due
               justification and with the written consent from THE AFFILIATE,
               may be carried forward to the Work Program for the following
               Agreement Year without affecting the rights of THE CONTRACTOR
               hereunder. Likewise,




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               should THE CONTRACTOR, with prior authorization by THE AFFILIATE,
               carry out more of the Work Program agreed on, said additional
               portion shall be deducted, with due justification and with the
               written consent of THE AFFILIATE, from the Work Program for the
               following Year of the Agreement, without affecting the rights of
               THE CONTRACTOR under this Agreement.

          5.3  At lease three (3) months in advance to the beginning of each
               Agreement Year, or as otherwise agreed upon by the Parties, THE
               CONTRACTOR shall prepare and submit for approval by THE AFFILIATE
               a Work Program for the Agreement Area, setting forth the proposed
               Operating Services to be carried out by THE CONTRACTOR during the
               following Agreement Year, the estimated cost thereof, the
               estimated production to be obtained and the estimated
               Hydrocarbons reserves. The Parties hereby agree that the Work
               Program for the first Agreement Year shall be prepared and
               submitted for THE AFFILIATE's approval within seventy-five (75)
               Days following the Effective Date, except as otherwise agreed by
               the Parties. THE AFFILIATE may grant or reject, for reasonable
               cause, the aforementioned approval of the Work Program, within
               the term established in Clause 5.4.

          5.4  In the event THE AFFILIATE shall wish to propose a revision of
               specific aspects of a Work Program, THE




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               CONTRACTOR shall be notified thereby during the forty-five (45)
               Days following the reception of the Work Program, specifying in
               detail the reasons for such modification. As soon as possible,
               the Parties shall meet in order to reach an agreement over the
               revisions proposed by THE AFFILIATE. However, any portion of the
               Work Program which THE AFFILIATE does not propose to revise
               shall be performed as established in the Work Program. In the
               event no revision is requested by THE AFFILIATE during the
               mentioned period of forty-five (45) Days, the Work Program shall
               be deemed approved as submitted by THE CONTRACTOR. 

          5.5  It is understood that the details of a Work Program may require
               changes in view of the prevailing circumstances, and nothing
               herein shall limit the right of THE CONTRACTOR to perform such
               changes, provided that the general scope of the Work Program is
               not modified by such changes and that they are approved in
               writing by THE AFFILIATE.

          5.6  In the event of emergencies or other special circumstances
               requiring immediate action, including, among others, fires,
               explosions, blow-outs and oil spills, leaks of toxic and/or
               dangerous substances (such as gas, chlorine and ammonia), THE
               AFFILIATE must be immediately informed by THE CONTRACTOR, who



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               must take the appropriate actions to control the situation or
               protect the facilities, people and property. Such actions must be
               timely notified to THE AFFILIATE, for purposes of pertinent
               coordination.

               Any justified expense incurred by THE CONTRACTOR in relation with
               such actions, without prejudice to the provisions of Clause 10.17
               hereof, shall be included in the Capital Costs.

               To meet the situations described above, THE CONTRACTOR must
               submit to THE AFFILIATE, within the sixty (60) days following the
               Effective Date, the emergency and contingency plans to attend to
               any Crude Oil spills.

               Notwithstanding the foregoing, and without prejudice to the
               obligations of THE CONTRACTOR hereunder, should THE AFFILIATE not
               be satisfied with the actions taken by THE CONTRACTOR, or should
               he consider it convenient to the interests thereof, THE AFFILIATE
               may inform THE CONTRACTOR of a direct intervention and may take
               any such action as may be considered advisable, and, in such
               event, any expenses incurred by THE AFFILIATE to that purpose
               shall be reimbursed by THE CONTRACTOR within the thirty (30) days
               following the receipt of the




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               corresponding invoice and, without prejudice to the provisions of
               Clause 10.17 herein, shall be included within the Capital Costs
               of THE CONTRACTOR.

          5.7  Nothing in Clause 5 hereof shall be interpreted as allowing THE
               CONTRACTOR to make disbursements for less than the minimum
               amounts guaranteed, or to perform less than the Minimum Work
               Program, as provided in Clause 5.1 hereof (and as detailed in the
               Minimum Work Program in Appendix "C"), during the first
               thirty-six (36) months of this Agreement, unless a revision to
               that purpose is specifically approved in writing by THE
               AFFILIATE.

          5.8  Without prejudice to the provisions of Clause 5.7, unless it is
               specifically otherwise allowed or justified hereunder, the lack
               of performance of twenty percent (20%) or more of the Work
               Program for any Agreement Year during the term thereof shall be
               considered a material breach of the obligations of THE CONTRACTOR
               hereunder and shall entitle THE AFFILIATE to immediately
               terminate this Agreement without prejudice to any other right or
               remedy available to THE AFFILIATE, including, but not limited to,
               the right to execute the guarantees given by THE CONTRACTOR.





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       6. RIGHTS AND OBLIGATIONS OF THE CONTRACTOR

          Other than the provisions hereunder, THE CONTRACTOR shall:

          6.1  At its sole expense, finance all the Operating Services without
               recourse to THE AFFILIATE, except as otherwise specifically
               provided in Clause 8 hereof.

          6.2  Prepare and implement the annual Work Program in accordance with
               the Norms and Regulations and any other applicable guideline or
               instruction and the oil industry practices, including any such
               regulations concerning safety, health, labor and environmental
               matters applied to the Venezuelan oil industry which are notified
               to THE CONTRACTOR. To such purpose, THE CONTRACTOR shall submit
               to THE AFFILIATE for approval, sixty (60) Days after the
               Effective Date, the following documents: 

               a)   The Program for preventing injuries and/or industrial
                    diseases.

               b)   The Plan for protecting the environment, specifying the 
                    steps to be taken for handling atmospheric emissions, solid
                    residues, toxic waste, or other polluting agents and for
                    preventing pollution of soil and effluents.




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               c)   Contingency plan as indicated in Clause 5.6.

               d)   Emergency plan as indicated in Clause 5.6.

          6.3  Unless as otherwise agreed upon by THE AFFILIATE, THE CONTRACTOR
               shall be responsible, during the term of this Agreement, for the
               maintenance, subject to normal wear and tear, of the facilities
               that it has put into service; and, at the appropriate time, but
               not later than the termination of this Agreement, for the
               abandonment of wells and for the cleaning and dismantlement of
               facilities that it has put into service. Such maintenance,
               abandonment, cleaning and dismantlement will be performed in
               accordance with Norms and Regulations.

          6.4  Perform, together with THE AFFILIATE, an Audit of Environmental
               Situation, in the Agreement Area, within a period not exceeding
               four (4) months from the Effective Date. 

               The cost of the audit shall be paid by the Parties in equal
               parts. Such audit shall be performed by a juridical person
               designated by mutual agreement between the Parties, in writing
               and in accordance with the Venezuelan legislation governing the
               matter. This expenditure will be a Non-Capital Cost for THE
               CONTRACTOR.




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               THE CONTRACTOR shall not be liable for the preexisting
               environmental conditions. In the event the Ministry of the
               Environment and Renewable Natural Resources and/or the Ministry
               of Energy and Mines were to order the correction or recovery of
               the environment in the Agreement Area because of preexisting
               conditions, the execution of such activities will correspond to
               THE AFFILIATE.

               Prior to the Starting Date of Operations, THE CONTRACTOR shall
               perform an Environmental Impact Study as provided in the
               Environmental Organic Law, and the cost thereof shall be included
               as a Capital Cost in accordance with Clauses 18.5 and 18.11.

          6.5  Submit on time to THE AFFILIATE copies of all the geological,
               geophysical, drilling, well, production and any such data and
               reports as THE CONTRACTOR may obtain and compile during the term
               hereof and from time to time. THE CONTRACTOR shall provide on a
               routine and timely basis any such reports as are necessary for
               THE AFFILIATE to comply with the statutory and internal reporting
               requirements thereof, according to the formats provided by THE
               AFFILIATE, including, but not limited to, reports of the
               estimated Hydrocarbons remaining reserves and the Production at
               year end.




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          6.6  Cooperate with and support THE AFFILIATE in obtaining any such
               third parties' permits and/or right of ways and/or servitude as
               are necessary for THE CONTRACTOR to reach or move inside the
               Agreement Area in order to perform the Operating Services
               provided hereunder. In order to obtain such permits, THE
               AFFILIATE shall be notified by THE CONTRACTOR, in writing, at
               least two (2) months in advance, of the precise indication of the
               zones affected by the Operating Services within the Agreement
               Area, as provided in the Work Program. At the end of each
               calendar month, an invoice shall be presented by THE AFFILIATE to
               THE CONTRACTOR expressing:

               a)   any payment made by THE AFFILIATE concerning such permits
                    and rights, in accordance with the rates THE AFFILIATE has
                    to such purpose, together with the corresponding supporting
                    vouchers.

               b)   administration, organization and men-hours expenditures and
                    costs incurred by THE AFFILIATE to obtain such permits and
                    rights.

               Such amounts shall be reimbursed to THE AFFILIATE by THE
               CONTRACTOR within the forty-five (45) Days following the
               presentation thereof and shall be charged to the Capital Costs of
               THE CONTRACTOR.




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          6.7  Give preference to goods and services produced in Venezuela or
               rendered by Venezuelans, provided they are offered under similar
               quality, price and availability conditions, when and in the
               amounts required.

          6.8  Pay any such taxes, contributions and duties as are required by
               the Venezuelan Laws and Ordinances. THE CONTRACTOR shall comply
               with the requirements of the law, specifically those concerning
               the filing of returns, determination and withholding of taxes,
               and maintenance and exhibition of books and records.

          6.9  Promptly respond to and pay the amounts owed, according to
               Clause 10 hereunder, and obtain and keep any such insurance
               policies as are required by said Clause 10.

          6.10 Subject to the terms and provisions hereunder, it shall:

               a)   perform any such activities as are reasonably required to
                    accomplish the purpose of this Agreement, according to
                    Clause 1.5 and as detailed in the Work Program.

               b)   custody and maintain any Hydrocarbons produced in the
                    Agreement Area up to the corresponding




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                    Transfer Points, as well as any other property, plant and
                    equipment of THE AFFILIATE inside or outside the Agreement
                    Area, which is under THE CONTRACTOR's guard and custody for
                    the performance of the Operating Services, in a good and
                    orderly condition, subject to normal wear and tear.

          6.11 Promptly after termination of this Agreement, deliver all those
               documents with data and reports, in original if they are
               available to THE CONTRACTOR, which have not been previously
               delivered to THE AFFILIATE.

          6.12 Comply with and cause its subcontractors to comply with:

               a)   all the laws, regulations and any other applicable 
                    provisions in the Republic of Venezuela.

               b)   all the norms set forth by THE AFFILIATE concerning its
                    contractors, including, without limitation, safety,
                    technical, operational, environmental and labor regulations,
                    including specifically the Labor Collective Contract as
                    interpreted by THE AFFILIATE, that is in force and
                    applicable to the Venezuelan oil industry,




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                    as notified to THE CONTRACTOR, during the term of this
                    Agreement.

          6.13 While performing the Operating Services, it shall take the
               necessary steps for the conservation and safety of life,
               property, crops, vegetation, fishing and fisheries, navigation,
               protection of the environment, prevention of pollution,
               disposition of effluent waters, including sea pollution, and the
               personnel safety and health, taking all reasonably necessary
               precautions to minimize damages to the environment.

          6.14 Keep confidential and take all reasonable measures to make sure
               that its employees, Associated Companies, and subcontractors and
               its employees do not disclose to third parties, without the
               previous written consent from THE AFFILIATE, any information
               produced and/or obtained by THE CONTRACTOR in relation to the
               Operating Services and/or the Agreement Area, except when the
               information must be disclosed:

               a)   To governmental authorities acting within the scope of their
                    competence, which will be timely notified to THE AFFILIATE.




                                      -26-
   27

               b)   In relation with requirements of stock exchanges where THE
                    CONTRACTOR's or its Associated Companies' share or
                    instruments are quoted.

               c)   To Associated Companies, professional consultants, banks, or
                    financial entities which reasonably require said
                    information, provided these entities agree in writing to
                    maintain such information strictly confidential.

          6.15 Obtain the authorization from THE AFFILIATE prior to publishing
               any information or publicity which is not in the public domain
               concerning the Operating Services and/or the Agreement Area. THE
               CONTRACTOR shall also demand from the subcontractors thereof to
               comply with this requisite.

          6.16 Make sure that all Hydrocarbons production transferred to THE
               AFFILIATE is of the quality specified in Appendix "A" and in the
               adequate volumes for reception in the facilities of THE
               AFFILIATE. It is understood that, during a test period of six (6)
               months counted from the Production Date, THE AFFILIATE shall
               receive the Crude Oil not meeting the quality specifications
               established in Appendix "A", and the treatment-related costs
               incurred therefor shall be charged to THE CONTRACTOR and imputed
               against future credits. These costs shall not be




                                      -27-
   28

               recovered by THE CONTRACTOR. The Natural Gas not meeting the
               quality specifications established in Appendix "A", subject to
               Clause 7.7, may be received by THE AFFILIATE under the same above
               conditions concerning Crude Oil.

          6.17 Retain control of every leased property and equipment and shall
               have the right to freely remove such property from the Agreement
               Area, except for those goods which, due to their fixed and
               permanent nature, become the property of THE AFFILIATE, without
               prejudice to THE CONTRACTOR's rights to continue using them for
               the Operating Services.

          6.18 Have equal rights as THE AFFILIATE to enter and exit the
               Agreement Area at any time, to and from the facilities inside,
               without interfering with the activities which THE AFFILIATE may
               be performing within the Agreement Area at the Effective Date.

          6.19 Have the right to use, and have access to, and THE AFFILIATE
               shall always make available, provided it is physically and
               legally possible, every geological, geophysical, drilling, well,
               production, and other information which THE AFFILIATE may now or
               in the future have concerning the Agreement Area, and provided
               that it is relevant and necessary to perform the obligations
               hereunder. THE CONTRACTOR shall keep




                                      -28-
   29

               confidential and take every reasonable step to make sure that its
               employees, Associated Companies, and subcontractors and their
               employees do not disclose to third parties, without prior written
               consent from THE AFFILIATE, any information directly or
               indirectly received by THE AFFILIATE hereunder.

          6.20 Be entitled to receive operating and capital fees on the basis of
               Production, as provided in Clause 8, during the term of the
               Agreement.

       7. RIGHTS AND OBLIGATIONS OF THE AFFILIATE

          In addition to the other provisions of this Agreement, THE AFFILIATE
          shall:

          7.1  Have title to all the Hydrocarbons produced and be responsible
               for the payment of the taxes and impositions related to the
               Production.

          7.2  Retain title to all original data and information resulting from
               the Operating Services, including, but not limited to,
               geological, geophysical, petrophysical, engineering, well logs
               and well completion reports and any other data compiled by THE
               CONTRACTOR during the term of this Agreement.




                                      -29-
   30


          7.3  As much as possible, cooperate with THE CONTRACTOR in order to
               facilitate the performance of this Agreement.

          7.4  Notwithstanding the obligations of THE CONTRACTOR hereunder, be
               entitled to inspect the activities of THE CONTRACTOR hereunder
               any time, and request all the information and reports it may
               consider appropriate.

          7.5  During the term of this Agreement, allow the use of the equipment
               and materials that, by virtue of this Agreement, shall become its
               property, only for the Operating Services hereunder, and, in the
               event THE AFFILIATE shall wish to use such equipment for any
               other purpose, it may do it to the extent that it does not
               interfere with THE CONTRACTOR in the performance of the Operating
               Services, and after consulting first with it. Furthermore, THE
               AFFILIATE shall have the right to access the Agreement Area to
               perform operations related to Hydrocarbons to the extent they do
               not interfere with the operations and Work Programs of THE
               CONTRACTOR.

          7.6  Unless Force Majeure circumstances are involved, take the guard
               and custody of all the Crude Oil production meeting the terms
               established hereunder, when THE




                                      -30-
   31

               CONTRACTOR makes it available at the Hydrocarbons Transfer Point,
               on or after the Production Date.

          7.7  Provided that THE AFFILIATE shall have agreed to receive specific
               volumes of Natural Gas, take the immediate custody of the volumes
               agreed when THE CONTRACTOR makes them available at the Gas
               Transfer Point. Unless otherwise agreed upon, THE AFFILIATE shall
               not be obliged to accept the custody of any amount of Natural Gas
               during the term of this Agreement.

               The Parties have agreed to the contrary of the provisions herein
               in the terms and conditions established in Appendix "A".

          7.8  Promptly pay to THE CONTRACTOR every applicable fee as set forth
               in Clause 8 and further in Clause 18.

          7.9  Exercise due diligence to negotiate and complete those agreements
               with third parties, land and real estate owners inside the
               Agreement Area as are necessary to obtain the right of entry or
               other reasonable rights required by THE CONTRACTOR to perform the
               Operating Services hereunder. Any right granted by third parties
               to THE AFFILIATE shall be extended to THE CONTRACTOR during the
               term of this Agreement. Any payment made by THE AFFILIATE







                                      -31-
   32

               concerning such permits and rights shall be reimbursed to THE
               AFFILIATE by THE CONTRACTOR within the forty-five (45) days
               following the submission of the supporting vouchers of such
               costs, which costs will be recovered by THE CONTRACTOR as Capital
               Costs.

          7.10 Maintain as confidential and take all reasonable measures to
               ensure that its employees and Associated Companies do not reveal
               to third parties, without the prior written consent of THE
               CONTRACTOR, information on know-how and technical, financial, or
               other information which is proprietary of THE CONTRACTOR or its
               subcontractors.

          7.11 Coordinate with THE CONTRACTOR, to the extent possible, the
               publication of information or publicity not in the public domain
               relating to the Operating Services, provided that THE AFFILIATE
               has control over these actions.

       8. COMPENSATION OF THE CONTRACTOR

          8.1  THE CONTRACTOR shall be compensated every Quarter on the basis of
               the volume of Hydrocarbons transferred to THE AFFILIATE at the
               Transfer Points, from and including the Production Date, as set
               forth in Clause 18.





                                      -32-
   33

          8.2  The fees for services Of THE CONTRACTOR, including the recovery
               of operating costs, will be paid as Operating Fees on the basis
               of the volume of Hydrocarbons transferred to THE AFFILIATE, as
               set forth in Clause 18.

          8.3  The Capital Costs (and Non-Capital Costs incurred prior to the
               Production Date that are included in the Capital Costs) may be
               recovered as Capital Fees on the basis of the volume of
               Hydrocarbons transferred to THE AFFILIATE, as set forth in Clause
               18.

          8.4  The Incentives for Production Increases will be paid as
               established in Subclause 18.17.

          8.5  The Parties understand that THE AFFILIATE and THE CONTRACTOR are
               subject to the Law on the Value Added Tax ("IVA") and to the
               regulations thereunder, as they may be amended from time to
               time, in relation with the services to be rendered and the
               compensation and reimbursement to be paid, under this Agreement.
               In accordance with the regime in force, THE AFFILIATE will pay
               THE CONTRACTOR, in Bolivars, the IVA amounts that THE CONTRACTOR
               must pay to the Government in relation to the services rendered
               and corresponding compensation under this Agreement. THE
               AFFILIATE shall pay this amount to THE CONTRACTOR within the
               terms established by Law for the payment of IVA by




                                      -33-
   34



               THE CONTRACTOR to the Government, through deposits in an amount
               and bank designated by THE CONTRACTOR, unless otherwise agreed.
               The amount of IVA to be paid by THE AFFILIATE to THE CONTRACTOR
               in independent from and in addition to the compensation and the
               reimbursements due for payment to THE CONTRACTOR in accordance
               with Clauses 8.1 through 8.4 and Clause 18 of this Agreement.

       9. PAYMENTS

          9.1  Except as otherwise specifically provided hereunder, all payments
               due to THE CONTRACTOR shall be made exclusively in Dollars of the
               United States, or, as decided by the Parties, in any other
               currency acceptable to THE CONTRACTOR, at a foreign bank to be
               agreed upon by the Parties, unless otherwise agreed.

               Any Capital Cost and any Non-Capital Costs prior to the
               Production Date incurred in Bolivars shall be paid in Dollars
               reconciled at the average exchange rate for the sale of that
               currency, established by the Banco Central de Venezuela on the
               date such Costs were incurred. Whenever these costs shall have
               been incurred in any currency other than Bolivars and Dollars,
               they shall be converted to Dollars at the exchange rate
               prevailing for the sale of this currency established by the Chase
               Manhattan Bank, New




                                      -34-
   35



               York, Hew York, at 11:00 a.m. on the date the costs were
               incurred.

          9.2  Every payment required as established hereunder shall be made on
               or before the end of the second calendar month following the
               Quarter object of the specific invoice.

               To such purpose, an updated invoice and two (2) copies reflecting
               the Capital Costs and Operating Fees, supported with statements
               of account, shall be submitted by THE CONTRACTOR to THE AFFILIATE
               within the first fifteen (15) Days following the end of the
               corresponding Quarter. THE CONTRACTOR must submit any additional
               documentary support as is required by THE AFFILIATE, including,
               without limitation, any pertinent invoice, contract and record.
               THE AFFILIATE shall be entitled to object to such invoice,
               indicating the reasons for its objection, and, in the event an
               objection were made within twenty-one (21) days from the receipt
               of the invoice by THE AFFILIATE, the payment of any disputed
               amount shall be delayed until the objection is duly settled by
               the Parties.

               The payment of an invoice by THE AFFILIATE shall not be
               considered a waiver by THE AFFILIATE of the right to submit a
               future objection or claim, or of any




                                      -35-
   36

               other right THE AFFILIATE may have concerning such payment. It is
               understood that the disputed amounts shall not accrue any
               interest whatsoever.

     10.  LIABILITIES, INDEMNITIES AND INSURANCE

          10.1 THE CONTRACTOR shall be liable for all injuries (including death)
               of its employees and/or those of its subcontractors, servants,
               agents and/or representatives thereof; and/or for the loss or
               damage to the properties of THE CONTRACTOR and/or its
               subcontractors and/or the properties of its employees, servants,
               agents and/or representatives and/or the properties of the
               employees, servants, agents and/or representatives of its
               subcontractors, unless it demonstrates that the harm or loss or
               damage is due to a non-imputable cause.

          10.2 Subject to the provision of Clause 10.20 of this Agreement, THE
               CONTRACTOR shall be liable for every loss and/or damage to the
               facilities, materials and equipment, whether they are inside the
               Agreement Area or otherwise, of THE AFFILIATE, provided that
               they are under the guard and custody of THE CONTRACTOR as set
               forth hereunder, resulting from the performance by THE CONTRACTOR
               and/or its subcontractors of any activity hereunder.




                                      -36-
   37

          10.3 THE CONTRACTOR shall be liable for any loss and/or damage to the
               properties Of THE AFFILIATE (other than those of THE AFFILIATE
               referred to in Clause 10.2) resulting from the willful misconduct
               or grossly negligent acts or omissions of THE CONTRACTOR and/or
               its subcontractors, and/or Associated Companies.

          10.4 THE CONTRACTOR shall be liable for:

               a)   Every loss and/or damage to the properties of third parties
                    and/or every injury (including death) to any person, which
                    occurs on the occasion or as a result of the performance of
                    this Agreement.

               b)   Every damage to natural resources, except Crude Oil, 
                    Natural Gas, and other minerals in situ, before their
                    extraction to the surface (but not excepting those damages
                    caused by willful misconduct or gross negligence) and every
                    damage to the environment, including, but not limited to,
                    damage or destruction of marine resources, wildlife, timber
                    resources, estuaries, streams or bodies of water, oceans,
                    land or air or any other damage which occur on the occasion
                    or as a result of the performance of this Agreement.




                                      -37-
   38



                    In case of loss of Hydrocarbons for reasons imputable to THE
                    CONTRACTOR or its subcontractors (that is, excluding losses
                    caused by Force Majeure or imputable to third parties), THE
                    CONTRACTOR shall be responsible vis-a-vis THE AFFILIATE for
                    the market value of the Hydrocarbons actually lost
                    (excluding recovered Hydrocarbons), minus THE CONTRACTOR's
                    compensation established in Clause 8 that THE AFFILIATE
                    would have paid to THE CONTRACTOR should those Hydrocarbons
                    have been delivered to it at the corresponding Transfer
                    Point. THE CONTRACTOR shall pay the corresponding amounts
                    within thirty (30) Days from the presentation of an invoice
                    by THE AFFILIATE.

               c)   Any fine or sanction that is imposed on the occasion or as a
                    result of the performance of this Agreement, without
                    prejudice to the right to submit administrative or judicial
                    claims provided by law.

                    The liability of THE CONTRACTOR, referred to in paragraphs
                    a) and b) of this Subclause, is without prejudice to its
                    right to demonstrate the intervention of a non-imputable
                    cause.




                                      -38-

   39

          10.5 THE CONTRACTOR shall hold harmless and indemnify THE AFFILIATE
               from and against any action, cause of action, damages, claims and
               suits whatsoever, whether at law or in equity, sentences,
               including costs and legal fees that may be rendered against THE
               AFFILIATE, arising from any incident referred to in Clauses 10.1,
               10.2, 10.3 and 10.4 hereof, based on the terms and subject to the
               exceptions established therein.

          10.6 THE CONTRACTOR shall hold harmless and indemnify THE AFFILIATE
               from and against any loss, damage and expenses, including
               attorney fees arising from any claim for infringement of a
               patent, copyright or other existing similar rights or to be
               granted, with respect to or arising out of the activities carried
               out by THE CONTRACTOR or its subcontractors hereunder, the
               manufacturing, incorporation or use of any material or equipment
               and/or any technique used in such activities.

          10.7 THE CONTRACTOR shall indemnify, defend and hold harmless against
               any lien and claim over the property of THE AFFILIATE and the
               materials, equipment or structures, or the premises on which they
               are located, provided these liens and claims are not imputable to
               THE AFFILIATE and they arise from or in connection with the
               activities developed by THE




                                      -39-
   40

               CONTRACTOR or its subcontractors hereunder, including, but not
               limited to, workers, materials and other services to be rendered
               by THE CONTRACTOR or its subcontractors or suppliers hereunder.

          10.8 THE CONTRACTOR shall defend and indemnify THE AFFILIATE against
               any claim, action, loss or damage that may affect THE AFFILIATE
               resulting from the failure of THE CONTRACTOR to comply with the
               obligations hereunder.

          10.9 THE AFFILIATE shall include THE CONTRACTOR as co-insured in the
               following corporate policies: All Risk Construction, Properties
               (fire, explosion, lightning, earthquake, Comprehensive Civil
               Liability and Control of Wells) and will include the insurers'
               waiver to its right to surrogate itself, in relation to the
               co-insured.

               THE CONTRACTOR shall reimburse THE AFFILIATE for any additional
               cost to the insurance premiums due to the above, and such costs
               shall be recovered as a Capital Cost, as defined in Clause 18
               herein.

         10.10 THE AFFILIATE shall defend and indemnify THE CONTRACTOR against
               any loss or damage to the properties of THE AFFILIATE covered by
               the corporate insurance policies of THE AFFILIATE, without




                                      -40-
   41
               prejudice to the provisions of Clauses 10.2 and 10.3 above.

         10.11 THE AFFILIATE shall defend and indemnify THE CONTRACTOR against
               any loss or damage resulting from any action taken by THE
               AFFILIATE with its own resources under the circumstances and as
               provided in Clause 5.6 of this Agreement,

         10.12 THE CONTRACTOR may carry, under terms and with insurance
               companies satisfactory to THE AFFILIATE, the following insurance
               policies during the term of this Agreement:

               a)   All Risk Construction.

               b)   Properties.

               c)   Insurance on Wells Control, including:

                    - Cost of Control (including the cost of control of
                      underground blowout)

                    - Redrilling Expenses

                    - Extraordinary Redrilling Expenses

                    - Expenses for Making Well Safe

                    - Expenses for Preparing and Conditioning

                    - Deliberate Well Firing

                    - Clean-up, Containment and Pollution





                                      -41-


   42
               The amounts to be covered under the insurance policies shall be
               equal to the applicable deductibles under the policies referred
               to in Clauses 10.9 and 10.10 hereunder and in accordance with the
               variations they suffer from time to time. Furthermore, it may
               carry insurance for the excess if it considers it convenient.
         
               THE CONTRACTOR may take out, additionally, other insurance
               policies which it considers convenient in relation with the
               Operating Services. The premiums of said policies will be
               considered as Capital Costs if they are approved as part of the
               Budget included in the corresponding Work Program.

     10.13     THE CONTRACTOR shall further carry and maintain the following 
               insurance policies under terms and with insurance companies
               satisfactory to THE AFFILIATE during the term of this Agreement:

               a) Motor Vehicles Liability Insurance covering motor vehicles
                  owned, leased or used by THE CONTRACTOR, in accordance with 
                  Venezuelan legislation.

               b) Workers' Compensation and Employer's Liability Insurance
                  covering the obligations of THE CONTRACTOR with respect to its
                  personnel.





                                     - 42 -
   43
               c) Any other insurance policy as THE AFFILIATE may require from 
                  time to time according to its corporate policies or the nature
                  and location of the Operating Services.

               d) Third Party Liability Insurance, including death or injury to
                  persons and accidents and/or damages to the property, 
                  including properties of THE AFFILIATE.

               The amounts to be covered by the insurance policies shall be
               determined as part of the annual Budget included in the
               corresponding Work Program approved by THE AFFILIATE.


     10.14     The insurance policies carried and maintained by THE CONTRACTOR
               referred to in Clauses 10.12 and 10.13 shall name THE AFFILIATE
               and Petroleos de Venezuela, S.A. as co-insured and include a
               waiver of the rights of the insurer to subrogation in relation to
               the co-insured.

               THE CONTRACTOR shall provide THE AFFILIATE with certificates or
               other documentary evidence showing that such insurance is
               maintained as required hereunder and that the premiums thereof
               have been duly paid.





                                     - 43 -
   44
     10.15     Except as otherwise expressly provided in this Clause 10, the
               obligations of THE CONTRACTOR hereunder shall not be restricted,
               limited nor altered by any provision, stipulation or arrangement
               with respect to the insurance policies, deductible or limitation
               of insurance coverage, nor by any approval of the insurance
               policies by THE AFFILIATE.

     10.16     THE CONTRACTOR shall obtain and furnish a guaranty issued by a
               bank or insurance company satisfactory to THE AFFILIATE, to
               guaranty the proper performance by THE CONTRACTOR of all the
               legal obligations towards employees. Such guaranty shall be in
               accordance with the format to be furnished by THE AFFILIATE and
               cover the amount to be determined by THE AFFILIATE prior to the
               Starting Date of Operations and shall be in force, through annual
               renewals, as from the Starting Date of Operations until fourteen
               (14) months after the termination of this Agreement.

     10.17     Except as otherwise provided in the second paragraph of Clause
               10.9 and the insurance premiums as determined in the annual
               Budget approved by THE AFFILIATE, any cost, expense or debt that
               may arise according to this Clause 10 may not be recovered by THE
               CONTRACTOR as part of the Capital Cost.





                                     - 44 -
   45
     10.18     Neither Party shall be liable before the other for indirect 
               damages or lost profits resulting from the breach of their
               respective obligations hereunder.

     10.19     For the purposes set forth in Clauses 10.9, 10.10, 10.12, 10.13,
               and 10.20, the deductibles and maximum coverage amounts in force
               as of the Effective Date of the Agreement are specified
               hereafter:



                               DEDUCTIBLES   MAXIMUM COVERAGE
                                 (U.S.$)      AMOUNT (U.S.$)
                               -----------   ----------------
                                       
Properties                          *

- -  Fire  and  other                                   *

- -  Earthquake                                         *

- -  Sabotage and Terrorism                             *

- -  Removal of Debris                                  *

- -  Extinction Expenses                                *

- -  Clean Expenses                                     *

Third Party Comprehensive
Liability                           *                 *

Control of Wells                    *                 *

Construction Risk

- -  Construction per
   Contract                         *                 *

- -  Third Party Liability            *                 *

- -  Other Adjacent
   Properties                       *                 *

- -  Transportation                   *                 *


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


                                     - 45 -
   46
               The above amounts are subject to modification. THE AFFILIATE will
               notify THE CONTRACTOR, in writing, the modifications to such
               amounts.

     10.20     THE CONTRACTOR and/or its subcontractors and/or Associated 
               Companies shall be responsible for losses and damages, up to the
               [amount of] the deductible of THE AFFILIATE's corporate insurance
               policies. THE CONTRACTOR and/or its subcontractors and/or
               Associated Companies may exonerate themselves of responsibility
               for payment of losses or damages that exceed the coverage of such
               policies, provided they demonstrate they acted diligently. Any
               other losses or damages not covered by the policies mentioned in
               this clause will be indemnified in accordance with applicable
               law.

     10.21     The provisions of this Clause 10 concern the relationship between
               the Parties, and they have been agreed without prejudice to the
               rights and obligations of each Party with respect to third
               parties.


11.  PROPERTY

     11.1      THE AFFILIATE shall obtain exclusive title to every operating
               facility, goods and/or equipment which is a Capital Cost used by
               THE CONTRACTOR to perform the





                                     - 46 -
   47
               activities hereunder, except any such real property located
               outside the Agreement Area, or movables located either inside or
               outside the Agreement Area, provided that THE AFFILIATE shall
               have specifically authorized THE CONTRACTOR or its
               subcontractors to retain title to such property, for reasons of
               economy or practical convenience.

               Notwithstanding the above, THE CONTRACTOR and its subcontractors
               thereof shall retain title to any movables introduced in the
               Agreement Area by THE CONTRACTOR to be temporarily used or for a
               specific temporary purpose.


     11.2      THE CONTRACTOR shall include in the Work Programs and shall 
               submit to the approval of THE AFFILIATE the leasing plans of the
               movables and real property which qualify as Capital Costs and
               are required for the performance of the activities hereunder, as
               well as the justification thereof.  THE AFFILIATE reserves the
               right to approve or disapprove such request.  


     11.3      The ownership of any technology and/or know-how, whether
               patented or not, as THE CONTRACTOR may specifically develop
               during the performance of the Operating Services shall be common
               to THE AFFILIATE and THE CONTRACTOR.  Notwithstanding such
               common ownership, both THE AFFILIATE and THE CONTRACTOR and  





                                     - 47 -
   48
               their Associated Companies shall have the right to use such
               technology in their own operations at no cost to them.  All the
               information concerning the technology and/or know-how shall be
               delivered to THE AFFILIATE by THE CONTRACTOR.

               Any disclosure of such technology or know-how to a third party
               other than the Associated Companies of THE AFFILIATE and THE
               CONTRACTOR, whether for a consideration or not, shall be subject
               to THE CONTRACTOR and THE AFFILIATE entering into a previous
               written agreement for such purpose.

12.  ARBITRATION

     12.1      Any dispute or controversy related to this Agreement that the
               Parties cannot settle shall be finally resolved through
               arbitration in the City of Caracas, Venezuela.         

     12.2      The arbitration board shall be conformed by three (3)
               arbitrators. Each Party will appoint one (1) arbitrator, who
               will jointly appoint the third arbitrator within thirty (30)
               Days from the appointment of the second arbitrator.  The
               arbitration shall be awarded pursuant to the Applicable Law, but
               the process shall be governed by     





                                     - 48 -
   49
               the Rules of the International Chamber of Commerce ("ICC") in
               force on the Effective Date.

     12.3      The provisions of this Clause 12 will survive the termination of
               this Agreement.                                   

13.  EMPLOYMENT AND TRAINING OF PERSONNEL

     13.1      THE CONTRACTOR shall obtain, hire, pay and maintain all the
               supervisory and administrative personnel, all the skilled and
               non-skilled labor, including any personnel hired abroad, as is
               necessary to perform the Operating Services.  THE CONTRACTOR
               shall only hire persons who are physically and mentally fit and
               technically competent.  As soon as the personnel is hired, THE
               CONTRACTOR shall be responsible for the transportation thereof
               from the point of origin to the locations of the Operating
               Services in Venezuela. THE CONTRACTOR shall further be
               responsible for the return transportation of such personnel to
               the points of origin.  THE CONTRACTOR shall pay all the expenses
               related to such personnel, including, but not limited to, any
               expense incurred in obtaining the passport, visa and solvency;
               hiring expenses; transportation costs and travel expenses.  THE
               AFFILIATE shall not be responsible for providing housing, goods
               or services for the performance of the Operating       





                                     - 49 -
   50
               Services to THE CONTRACTOR, its contractors or its
               subcontractors.

     13.2      THE CONTRACTOR agrees to hire qualified personnel for its
               operations, and, once Production begins, it shall undertake the
               training of Venezuelan personnel required to fill in labor and
               staff positions, including administrative and management
               executive positions.     

     13.3      Costs and expenses incurred in the training of personnel outside
               the regular scope of operations shall be included in Capital
               Costs, provided that the adequate provisions shall have been
               made in the Work Program.                      

     13.4      THE CONTRACTOR is bound to protect, defend and indemnify THE
               AFFILIATE against any claim, demand, damage, obligation, cost
               and expenses whatsoever resulting or derived from the labor or
               work contracts of THE CONTRACTOR, or from any applicable law,
               decree or regulation, pertinent or related to such employment,
               or the breach of such contracts, laws, decrees or regulations. 





                                     - 50 -
   51
14.  ACCELERATED TERMINATION

     If at any time after completing the Minimum Work Program for the first
     thirty-six (36) months of the Agreement THE CONTRACTOR were to find
     evidence of no Crude Oil in the Agreement Area, or that the potential
     Crude Oil bearing formations as exist or as are likely to be found are not
     capable of commercial production because of the possible investment or
     necessary expenses required to undertake such exploitation, THE CONTRACTOR
     may request THE AFFILIATE, in writing, to approve the accelerated
     termination of this Agreement within sixty (60) Days following the date of
     such request.
     
     All the data and information as THE CONTRACTOR may produce to support its
     claim that the Agreement Area is not susceptible to Production must be
     attached to the request.

     Furthermore, THE CONTRACTOR shall promptly provide any additional data and
     information as may be required by THE AFFILIATE to better support the
     claim of THE CONTRACTOR.

     Any refusal by THE AFFILIATE to approve the termination of the Agreement
     under these conditions may not be unreasonable.





                                     - 51 -
   52
15.  ACCOUNTING AND AUDITS

     15.1     All the books and records of THE CONTRACTOR pertinent to the
              operations hereunder shall be kept on a calendar-year basis, abide
              by the Applicable Law and be available to be audited by THE
              AFFILIATE, subject to prior ten (10) Day advance notice. 

              THE CONTRACTOR must further comply with any reasonable special
              instructions or requirements concerning the operations hereunder
              as are indicated by THE AFFILIATE with relation to the books and
              records thereof and the invoicing processes, budget and
              preparation of financial statements.

     15.2     Any time during the term of this Agreement, subject to prior ten
              (10) Day advance notice, THE AFFILIATE shall have the right to
              inspect and audit all the books and accounting of THE CONTRACTOR,
              with respect to any Agreement Year, within five (5) years
              following the end of such Agreement Year, whether directly or
              through independent accountants specifically engaged for that
              purpose.  THE CONTRACTOR shall include in every subcontract
              entered into with respect to this Agreement provisions granting
              THE AFFILIATE the same auditing rights as are granted hereunder.
           




                                     - 52 -
   53
              THE CONTRACTOR shall keep and have available to THE AFFILIATE all
              the books, records and papers and shall cause its subcontractors
              to keep any such records, papers and books as are related to all
              the activities hereunder, so that THE AFFILIATE may exercise the
              rights granted hereinabove.

16.  ASSIGNMENT

     16.1     Neither Party shall have the right to assign or delegate their
              rights or obligations hereunder without previous consent in
              writing from the other Party, except that:

              a) Either Party may execute such assignment or delegation to an
                 Associated Company, provided that the assignor or delegating
                 Party shall remain responsible for the proper and correct
                 performance of its obligations hereunder.

              b) THE CONTRACTOR may subcontract any part of its operations or
                 activities hereunder, provided that the subcontracts shall be
                 subject to reasonable market conditions and shall be awarded to
                 subcontractors who are technically and financially reliable.
                 THE CONTRACTOR shall further be responsible for the performance
                 of  





                                     - 53 -
   54
                 such subcontractors as if the activities were performed by THE
                 CONTRACTOR itself.

     16.2     Unless otherwise agreed upon by the Parties, any subcontract
              referring to Capital Costs that in the aggregate exceeds the
              amount of     *     of the United States
              (U.S.$     *     ) or an equivalent amount in any other currency
              shall be subject to a previous written consent by THE AFFILIATE. 
           
     16.3     Except when duly justified for economic and technical reasons, THE
              CONTRACTOR shall award all subcontracts referred to in Clause
              18.8 on the basis of a competitive process of selection.  To such
              purpose, THE AFFILIATE and THE CONTRACTOR shall establish within
              three (3) months following the Effective Date the documents
              containing the subcontracting, operating, accounting and
              invoicing procedures that are necessary for the adequate
              performance of this Agreement.

17.  OTHER PROVISIONS

     17.1     Every notice required or given by either Party to the other shall
              be deemed to have been received when delivered in writing at the
              address of the addressee.                                    

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


                                     - 54 -
   55
              Any such notices shall be address to:


              THE CONTRACTOR                      THE AFFILIATE           
                                                                          
              COMPANIA OCCIDENTAL DE              MARAVEN, S.A.           
              HIDROCARBUROS, INC.                 Av. La Estancia         
              Av. Francisco de Miranda            Edif. Maraven           
              Edif. EASO, Mezzanina-Ofic. A       Chuao, CARACAS 1060     
              Chacaito, CARACAS, 1050             Venezuela               
              Venezuela                           Attn.:  Gerente de      
              Attn.:    Gerente General                   Exploracion     
                                                          y Produccion    
                                                                    

              Either Party may substitute or change the address upon written
              notice to the other Party.


     17.2     Considering the characteristics and nature of the Operating
              Services to be performed hereunder, the provisions set forth in
              Decree No. 1821 dated August 30, 1991, shall not apply to this
              Agreement.  Therefore, every term and condition established herein
              shall be considered to be special contracting condition for the
              purposes of the above-mentioned Decree No. 1821.           

     17.3     Without prejudice to the obligations of THE CONTRACTOR provided in
              Clause 10 herein, any fault or delay by either Party in the
              fulfillment of their obligations or duties hereunder shall be
              excused only to the extent attributable to Force Majeure.
             




                                     - 55 -
   56
     17.4     In the event the operations were delayed, restricted or prevented
              by reason of Force Majeure, the term of this Agreement and every
              right and obligation hereunder shall be extended for a period of
              time equal to the period affected by the Force Majeure, up to a
              maximum of five (5) years.                                       
           
     17.5     The Party whose ability to comply with its obligations is so
              affected shall notify the other Party in writing, indicating the
              cause, and both Parties shall exercise their reasonable endeavors
              to cease or mitigate the effects of such cause, as the case may
              be.                      

     17.6     Except as otherwise provided hereunder, the agreements and pacts
              established in Clauses 6.3, 6.8, 6.9, 6.11, 6.14, the
              confidentiality obligations set forth in Clause 6.19 and any such
              agreements and pacts as are provided in Clauses 10.1, 10.2, 10.3,
              10.4, 10.5, 10.6, 10.7, 10.8, 10.16, 11.3 and 15.2 shall survive
              the termination of this Agreement in relation with information
              received or events which occurred during the term thereof, until
              they are completely satisfied as provided therein.    
        
    17.7      No provision in this Agreement shall constitute THE CONTRACTOR, or
              any of its employees, sub-contractors, or agents, an agent,
              representative or employee of





                                     - 56 -
   57
              THE AFFILIATE. THE CONTRACTOR shall be an independent contractor
              and shall be responsible for and have the control over the details
              and means for performing the Work Program.  Any provision herein
              granting THE AFFILIATE the right to direct THE CONTRACTOR as to
              the details of the performance of the work or to exercise a
              control mechanism over THE CONTRACTOR shall not be construed to
              reduce or release the obligations of THE CONTRACTOR hereunder.

              THE CONTRACTOR is an autonomous company, and its personnel is
              hired for its exclusive account.  As the employer, THE CONTRACTOR
              is solely responsible for the performance of the obligations
              assumed towards its personnel by virtue of the Labor Organic Law
              and the regulations thereof, the Social Security Law and the
              regulations thereof, the INCE Law and the regulations thereof and
              any other law, regulation, decree, resolution or order passed by
              the competent authority, and by virtue of the individual or
              collective contracts entered into with its personnel. Should THE
              AFFILIATE be forced to pay an amount of money for any concept, by
              virtue of a claim filed by any worker of THE CONTRACTOR before the
              judicial authorities or labor administrative authorities or other,
              or by professional associations, unions or by third parties,
              whether Venezuelan or foreigner against THE CONTRACTOR and/or THE
              AFFILIATE, THE





                                     - 57 -
   58
              CONTRACTOR shall immediately reimburse THE AFFILIATE every such
              payment. THE AFFILIATE is authorized by THE CONTRACTOR to deduct
              such amount from any amount as may be owed by THE CONTRACTOR to
              THE AFFILIATE.

              It is agreed by the Parties that THE CONTRACTOR shall be
              responsible for settling, under acceptable terms and at its own
              discretion, any strike or act planned by the workers of the
              CONTRACTOR, provided that such situation shall not affect THE
              AFFILIATE or the Venezuelan Oil Industry, and, in such event, THE
              AFFILIATE and THE CONTRACTOR shall jointly seek solutions to
              remedy the situation as soon as possible.

    17.8      It is the intention of the Parties that common reservoirs that may
              exist in the Agreement Area and other adjacent areas be the
              subject of unified extraction agreements.  The Parties will
              dedicate their efforts to achieve such agreements.             

18. ACCOUNTING PROCEDURES

    18.1      The following provisions set forth to implement the payment of
              fees between THE CONTRACTOR and THE AFFILIATE are solely and only
              for the purpose of calculating the fees of THE CONTRACTOR.  Both
              THE AFFILIATE and THE CONTRACTOR shall be responsible for     





                                     - 58 -
   59
              the Venezuelan taxes pursuant to the Venezuelan tax laws in force,
              and nothing in this Clause 18 shall be construed in any way to be
              contrary to such laws and regulations.

    18.2      Definitions: The provisions of this Clause 18 shall be followed
              and observed in the compliance of the obligations of each Party
              hereunder. The definition and terms in this Clause 18 shall have
              the meanings herein indicated.                         

    18.3      Accounting and Records: The records and accounting books of THE
              CONTRACTOR shall be kept according to accounting systems generally
              accepted and recognized, consistent with the current practices and
              procedures of the oil industry (PDVSA and its Affiliates) and
              according to the Venezuelan practice.

              In the event of any inconsistency or doubt between the accounting
              systems and practices generally accepted and the current
              procedures of the oil industry, the Parties must solve them by
              mutual agreement taking into consideration the Accounting Norms
              and Procedures from PDVSA which have been notified to THE
              CONTRACTOR.  THE CONTRACTOR shall organize and prepare reports for
              the use of THE AFFILIATE in the performance of its
              responsibilities hereunder.





                                     - 59 -
   60
    18.4      Non-Capital Costs: Non-Capital Costs are those reasonable and
              necessary expenses actually incurred by THE CONTRACTOR, related to
              the current year operations, provided that they are included as
              Non-Capital Costs in the pertinent Budget.

              The Non-Capital Costs include, but are not limited to, the
              following:

              a)   Labor, materials and services used in daily oil operations,
                   including field facilities operations, secondary and tertiary
                   recovery and other enhanced recovery operations, storage,
                   handling, hauling and processing operations, measurement, and
                   other operational activities, including surface and 
                   subsurface equipment repair and maintenance.

              b)   Office, services and general administration of main and
                   field offices in Venezuela, general services, including
                   technical and related services, tangible services, hauling,
                   lease of special or heavy equipment, personnel expenses,
                   public relations and any other expenses incurred abroad which
                   do not qualify as a Capital Cost in accordance with this
                   Agreement.                      





                                     - 60 -
   61
              c) Auxiliary or temporary facilities having less than one (1)
                 year of [useful] life. 
              
              d) Every technical or managerial cost other than those 
                 specifically covered in Clause 18.5.   
              
   18.5       Capital Costs: Capital Costs are those reasonable and necessary
              disbursements actually made by THE CONTRACTOR for items that
              normally have a useful life beyond the year they are incurred,
              provided they are included in the pertinent Budget as Capital
              Costs and, further provided, in the case of equipment and/or
              facilities, that they already be located in the Agreement Area.
        
              The Capital Costs include, but are not limited to, the
              classification described herein: 

              a) Drilling of wells: all tangible and intangible costs for
                 drilling of wells, including drilling of test, delineation,
                 [and] injection wells, as well as the initial construction of
                 access roads leading to the wells.           

              b) Rehabilitation of wells: All the tangible and intangible costs
                 for the rehabilitation of wells, including redrilling or 
                 recompletion of wells, initial installation of artificial





                                     - 61 -
   62
                 lifting equipment, changes of producing intervals, initial
                 gravel packing, stimulations and fractures.  Every other
                 rehabilitation shall be considered a Non-Capital Cost.
        
              c) Construction of Service [facilities]: Workshops, energy and 
                 water facilities, warehouses and field roads.  Cost of oil
                 piers and anchorages, treatment plants and equipment, systems
                 of secondary and/or enhanced recovery, gas plants and steam
                 systems.
        
              d) Production facilities, including the costs for fuel, hauling 
                 and supplies for construction outside the Agreement Area and
                 installation in the Agreement Area, and other construction
                 costs incurred for the erection of platforms and installation
                 of piping, wellhead equipment, subsurface lifting equipment,
                 production tubing, sucker rods, surface pumps, flow lines,
                 gathering equipment, delivery lines and storage facilities,
                 excluding costs relating to the personnel that will be in
                 charge of operating such facilities.

              e) Equipment: Drilling and surface and subsurface production
                 tools, equipment and instruments, bares, floating equipment,
                 automotive equipment,





                                     - 62 -
   63
                 aircraft, construction equipment, furniture and office 
                 equipment, and miscellaneous equipment.

              f) Personnel, materials and services used in aerial, geological,
                 topographical, geophysical and seismic surveys; core drilling
                 and other non-routine surveys related to production 
                 maintenance.

              g) Certain annual costs, including insurance costs, import duties
                 related to capital items, any national, state, local or
                 municipal taxes, other than Venezuelan Income Tax and taxes
                 which provide tax credits against Venezuelan Income Tax,
                 certificate of occupancy and rights of way, land or real
                 property rentals and the costs of any geological or geophysical
                 information acquired, independent technical studies and
                 independent reserve estimates reports and training of
                 Venezuelan labor and professional staff outside the normal
                 scope of operations.

              h) Labor, materials and services associated with Capital 
                 projects, and reasonable amount of spare parts and material 
                 inventory associated with Capital projects.





                                     - 63 -
   64
    18.6      Overhead Allocation: No general overhead costs incurred outside
              Venezuela shall be included as Capital or Non-Capital Costs. Only
              those costs qualifying as Capital Costs and covered by specific
              agreements approved by THE AFFILIATE shall be recovered as 
              Capital Costs.      

    18.7      Unrecovered Capital Costs and Interests: The Unrecovered Capital
              Costs are that portion of the total Capital Costs spent up to 
              the end of the previous Quarter that, complying with the 
              conditions established hereunder, have not yet been recovered as
              Capital Fees.

              The total Unrecovered Capital Costs as of the end of the preceding
              Quarter may accrue interest at                *                   
              rate corresponding to five (5) working days previous to the
              beginning date of the considered Quarter or the previous Friday,
              if such date happens to be either a Saturday, Sunday or a holiday
              in the United States of America.  The referenced rate shall be the
              average of the rates provided at 11:00 a.m. (New York time) by the
              following banks, Chase Manhattan Bank, Bankers Trust and Bank of
              Tokyo.  Such interest (hereinafter called "Interest Rate") shall
              be paid as provided in Clause 18.12.

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



                                     - 64 -
   65
    18.8      Except where inconvenient from the economic and practical point 
              of view, any agreement with third parties for the acquisition of
              capital goods, technical or other services to be considered as
              Capital Costs or as Non-Capital Costs prior to the Production Date
              shall be awarded on the basis of competitive tenders, always
              trying to assure costs not exceeding the prevailing market levels.

              In the event that the services or leased equipment were supplied
              by Associated Companies of THE CONTRACTOR, only such costs as are
              the lower of,

              a) the net cost of services rendered or equipment leased for the
                 Associated Companies of THE CONTRACTOR which provided them; and

              b) the standard commercial fee charged by third parties for
                 supplying such goods and services 

              will be recognized. 
   
    18.9      After establishing the Production Date, THE CONTRACTOR shall 
              recover all the costs and fees every quarter as set forth in the
              terms and conditions herein and as further specified, on the 
              basis of the volume of Hydrocarbons transferred to THE AFFILIATE





                                     - 65 -
   66
              at the Points of Transference, measured in accordance with the
              norms ruling the matter.

    18.10     All the Costs of THE CONTRACTOR other than Capital and [other
              than] Non-Capital Costs prior to the Production Date, including
              but not limited to operating costs and fees for the services of
              THE CONTRACTOR, may only be recovered through the Operating Fees
              ("OPFee").                                                      

              The OPFee shall be calculated according to the Crude Oil
              Production delivered to THE AFFILIATE.

              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is          *         the OPFee is equal to       *         .

              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is        *       , the OPFee shall be calculated according to
              the following formula:


                                       *


              If the volume of Crude Oil Production delivered to THE AFFILIATE
              is       *       , the OPFee shall be calculated according to the
              following formula:


                                          * 

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




                                     - 66 -
   67
  WHERE:



                                 *


                                 *

                     *
                      
                     *

                     *
  
                     *

                     *

              The OPFee shall be subject to adjustments after the Quarter that
              includes the Effective Date hereof as follows:

              As of the Quarter following the one that includes the Effective
              Date hereof, the "$/Barrel OPFee" of THE CONTRACTOR shall be
              adjusted for inflation every Quarter, so that the OPFee shall
              reflect an adjusted value every succeeding Quarter.

              The inflation adjusted $/Barrel OPFee formula shall be determined
              according to the following formula:

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




                                     - 67 -
   68
                   *
                    



                   *

                   *

                   *

                   *


                   *

- ----------------
(*) The inflation index applicable in determining the OPFee adjusted
    for any Quarter after the first Quarter subsequent to the Effective Date
    hereof shall be the "Special Index-Energy" (unadjusted) of the "Consumer
    Price Index" for all "Urban Consumers" (CPI-U), United States City Average
    (based period 1982-1984 = 100) of the "Summary Data from the Consumer Price
    Index News Release" as published every month by the "United States 
    Department of Labor Statistics, Washington, D.C. 20212."

    Should the inflation index, as indicated every month in the "News Release"
    described above suffer corrections at any time after its publication and
    utilization for OPFee adjustments, a suitable reconciliation to the invoices
    of the following Quarter shall be applied.

    Should the index of the base period (1982-1984 = 100) be revised, it must be
    clear that the intent of this indexing provision is to adjust the OPFee in
    proportion to the average price level in the Previous Quarter to the Quarter
    being invoiced, by using the information of the three (3) months of the
    Current Quarter and that of the three (3) months of the Previous Quarter.

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




                                     - 68 -
   69
              The procedures hereinabove described shall be applied subsequent 
              to the Effective Date hereof.

    18.11     Capital Costs (and Non-Capital Costs prior to the Production Date,
              that by definition are Capital Costs), shall be recovered as
              Capital Fees (CFee).  It being understood that Capital Fees (CFee)
              [are the] cumulative recovery of Capital Costs accounted for up to
              the end of the Quarter being invoiced, calculated by the straight-
              line method over ten (10) years.  It is understood that, under no
              circumstances, the compensation formula herein established will
              give rise to a double recovery of any Capital Cost.

              The Capital Costs incurred after the tenth (10th) Year of the
              Agreement shall be recovered by the straight-line method, during
              the remainder of the time the Agreement is in force, provided
              that the Maximum Total Fee ("MTF") so permits.

              The recovery of the CFee for Capital and Non-Capital Costs prior
              to the Production Date shall be calculated as of the Production
              Date.

    18.12     The interest referred to in Clause 18.7 may be charged and
              recovered as part of Capital Costs and





                                     - 69 -
   70
              Non-Capital Costs in the aggregate of Unrecovered Capital Costs,
              as follows:


              *


              *

              *

              *

              No interests on the Capital Costs prior to the Production Date
              shall be accrued nor paid.  Even though the interests shall be
              treated as part of the Capital Costs in the recovery process, no
              interests shall be accrued by such interests.

     18.13    The total compensation to be received by THE CONTRACTOR in any 
              Quarter, as set forth in Clauses 18.10, 18.11 and 18.12 shall not
              exceed the amount of $/bbl equal to the Maximum Total Fee (MTF)
              adjusted as established below.

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






                                     - 70 -
   71
              The initial Maximum Total Fee (MTF) payable by THE AFFILIATE in
              any Quarter shall be   *   US$/Bbl adjusted according to the
              following paragraphs:

              The Maximum Total Fee (MTF) payable by THE AFFILIATE in any
              Quarter shall be subject to indexation so that the adjusted value
              shall be reflected by the MTF for the subsequent Quarters.  Such
              indexation adjustment shall be based on the variation upwards or
              downwards in the Price of a Basket of Products ("PCP") applicable
              to light, medium or heavy crudes, as corresponding in accordance
              with the gravity of the Hydrocarbons delivered to THE AFFILIATE,
              according to the price formulas stated below:

              LIGHT CRUDE is the one the gravity of which is higher or equal to
              30 degrees API,

              MEDIUM CRUDE is the one the gravity of which ranges between 21.9
              degrees and 29.9 degrees API,

              HEAVY CRUDE is the one the gravity of which is lower than 21.9
              degrees API.

              The PCP for LIGHT CRUDES shall be calculated according to the
              following formula:

                                       *

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





                                     - 71 -
   72
              The PCP for MEDIUM CRUDES shall be calculated according to the
              following formula:

                                          *

              The PPB for HEAVY CRUDES shall be calculated according to the
              following formula:

                                          * 



                                          *              


                                                                 


              Should any of the components of the basket of products not be
              published on a routine basis, or should an anomalous quotation
              appear, the Parties shall meet to agree upon a revised Basket of
              Products in order to determine the indexation of the Maximum Total
              Fee.

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





                                     - 72 -
   73
              The initial Maximum Total Fee (MTF) as specified above shall
              be adjusted according to the formula stated below, so that, to
              adjust the MTF, the first Current Quarter shall be the first
              Quarter of 1993 and the first Previous Quarter shall be the fourth
              Quarter of 1992, so that each succeeding Quarter reflects the
              adjusted level:

                                            *  
                                             
              WHERE:

                                            *

                                            *

                                            *

                                            *

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


                                     - 73 -
   74
    18.14     Any unrecovered Capital Fee (CFee) because of limitations of the
              Maximum Total Fee (MTF) in any Quarter, may be carried forward for
              a later recovery during the term of this Agreement; provided that
              this is allowed by the adjusted Maximum Total Fee (MTF).

              Any unrecovered Operations Fee because of limitations of the
              Maximum Total Fee (MTF) in any Quarter, may be carried forward for
              a later recovery during the term of this Agreement, provided that
              this is allowed by the adjusted Maximum Total Fee.  These
              Operating Fees carried forward shall not accrue interests nor
              shall they be subject to an inflation indexing adjustment.

              In any Quarter, THE CONTRACTOR shall first recover the current
              Operating Fees and the previous unrecovered Operating Fees,
              followed by any current interest and the previous unrecovered
              interests, and finally, the current Capital Fees and the previous
              unrecovered Capital Fees to the extent allowed by the prevailing
              Maximum Total Fee (MTF).

    18.15     Natural Gas Transferences: If no alternate agreement between THE
              CONTRACTOR and THE AFFILIATE has been reached, one (1) barrel of
              Crude Oil for each 39,600 standard cubic feet of Natural Gas,
              measured at 14.7 lpc and 60 degrees F delivered to THE AFFILIATE,
              as set forth




                                     - 74 -
   75
              in Clause 7.7 hereof shall be credited to THE CONTRACTOR as
              delivered to THE AFFILIATE.

    18.16     Inspection Points: In the event an inspection were necessary to
              meet the requirements and regulations on Hydrocarbons production
              in the area as established by the Ministry of Energy and Mines, at
              one or more points inside or near the Agreement Area, such
              inspection shall constitute no transference of Hydrocarbons nor
              indicate acceptance of the custody by THE AFFILIATE.  This custody
              will be accepted only at the Crude Oil and/or Natural Gas
              Transference Points and under the terms hereunder.

    18.17     Incentive for Production Increment: THE AFFILIATE agrees to pay to
              THE CONTRACTOR * Dollars of the United States of America per
              barrel (US$*/Bl), for each barrel of Hydrocarbons produced and
              delivered to THE AFFILIATE, above the level established by THE
              AFFILIATE, which hereinafter shall be considered accumulated
              production.  This incentive is additional to the Operating Fee and
              Capital Fee and independent from the Maximum Total Fee (MTF), and
              shall be payable as set forth in Clause 9.2.

              Said incentive shall be subject to indexing following the same
              procedure established for the Maximum Total Fee ("MTF"), according
              to Subclause 18.13 above.

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




                                     - 75 -
   76




                   ACCUMULATED PRODUCTION       INCENTIVE
                       (MMBls)                   (US$/Bl)
                                              
                          52.0                       *


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




19. TERM AND APPLICABLE LAW

    19.1      This Agreement shall be in force as of the Effective Date.

    19.2      This Agreement shall be construed and governed by the Laws of the
              Republic of Venezuela, which are defined in Clause 2.29 as the
              Applicable Law.
 
    19.3      This Agreement shall not be amended nor modified in any way except
              by mutual agreement in writing of the Parties.

    19.4      In witness whereof, the Parties have signed two (2) identical
              copies of this Agreement, in the City of Caracas, on the 
              nineteenth (19th) day of the month of November, 1993.       


By THE AFFILIATE                             By THE CONTRACTOR


      (Signed)                                      (Signed)  
- --------------------------                   --------------------------
  Eduardo Lopez Quevedo                            Joseph F. Snape
       President                                      President





                                     - 76 -
   77
                                  APPENDIX "A"

                          DESCRIPTION OF AGREEMENT AREA

AREA

The area of the agreement is located in the State of Zulia, comprises 391,973.51
hectares and is included within the area which corners are defined by U.T.M.
coordinates as indicated in the map included as Appendix "B".

TRANSFER POINTS AND CONDITIONS OF TRANSFER



           TRANSFER POINT                                         CONDITION
           --------------                                         ---------

                                                    
Crude oil

     Alpuf Flow Station for the                        Stabilized crude with less
     Alturitas, San Julian, San                        than 0.5% BS&W 23-30 degrees API.
     Jose, Machiques, Totumos,
     and Alpuf fields.

     Garcia Urdaneta Plant for                         Stabilized crude with less
     the Garcia Urdaneta field.                        than 0.5% BS&W 23-30 degrees API.

Natural Gas

     Alpuf Flow Station for the                        Less than 20 ppm of H(2)S.
     Alturitas, San Julian, San
     Jose, Machiques, Totumos,
     and Alpuf fields.

     Garcia Urdaneta Plant for                         Less than 20 ppm of H(2)S.
     the Garcia Urdaneta field.

     The Affiliate accepts to
     receive all the available
     treated Natural Gas.



                                     A - 1
   78
OPERATORSHIP CONDITIONS

The Contractor will be responsible for the construction, operation and
maintenance of all necessary production, separation, measurement, treating,
storage, dehydration, and disposal facilities in order to transport the crude to
the transfer points.

While the construction of the Alpuf Flow Station is in progress (6 months
maximum), the Parties will agree, in writing, the dehydration costs in Punta de
Palmas and other basic services which Maraven will charge the Contractor.




                                     A - 2
   79

                                  APPENDIX "B"

                              MAP OF AGREEMENT AREA


                                     B - 1
   80
                                  APPENDIX "C"

                        MINIMUM WORK PROGRAM AGREED UPON



ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
                                                                                          
*                                             *                                      *                *

*                                             *                    *                 *                *

*                                             *                    *                 *                *

*                                             *                    *                 *                *

*                                                                                    *                *

*                                                                                                     

*                                             *                                                       *

*                                             *                                                       *

*                                             *                                                       

*                                                                                                     *

*                                             *                                      *                

*                                             *                                                       *

*                                                                                    *                *

*                                             *                                                       *

*                                                                   *                

*                                             *                     *                *                *

*                                                                   *                *                *


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



                                     C - 1
   81
Service to wells consists of hydraulic pump/ESP change outs. Rehabilitation to
Wells consists of asphaltene/restimulation jobs. Technical advising includes
VSD/ESP consultants. All others will be inhouse staff.



                                                                             MM $
                                             --------------------------------------------------------------
ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
                                                                                          
CAPITAL

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*

*

*

*                                            *                   *                    *              *

*                                            *                   *                    *              *

*

*

*                                                                                     *              *   


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


                                     C - 2
   82


                                                                             MM $
                                             --------------------------------------------------------------
ACTIVITIES                                   1st YEAR            2nd YEAR            3rd YEAR         TOTAL
- ----------                                   --------            --------            --------         -----
CAPITAL (cont.)
- ---------------
                                                                                          
*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

Subtotal                                     *                    *                  *                *

EXPENDITURES
- ------------
*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 

*                                            *                    *                  *                * 
                                          --------             --------            --------         ------
Subtotal                                     *                    *                  *                *
                                          --------             --------            --------         ------
TOTAL                                        *                    *                  *                *


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



                                     C - 3
   83

                                  APPENDIX "D"

                    FORM OF THE IRREVOCABLE GUARANTY FOR THE
                     GUARANTEED PORTION OF THE WORK PROGRAM
                      FOR THE FIRST THIRTY-SIX (36) MONTHS

FROM: BANK
TO:   THE AFFILIATE

We hereby establish our irrevocable "Stand-By" Letter of Credit No. ________ in
favor of Maraven S.A. ("THE AFFILIATE"), for the account of (Name and address
of THE CONTRACTOR) up to a total amount of U.S.$_____________ to secure the
satisfactory performance of the Minimum Work Program obligations of (Name of THE
CONTRACTOR), as provided in the Operating Services Agreement for (Area Name)
entered into by (THE CONTRACTOR) and (THE AFFILIATE) on (Date of Execution).

TERMS

I.   This "Stand-By" Letter of Credit is available for payment at sight by us,
     against submission of a tested telex advising bank, stating that the
     advising bank has received a certificate or tested telex from THE AFFILIATE
     stating:

     QUOTE

     (1)  We demand payment for U.S.$(to be indicated by THE AFFILIATE) since
          (Name of THE CONTRACTOR) has defaulted its obligations within the
          Minimum Work Program, as provided in the Operating Services Agreement
          for (Area Name) entered into between (THE CONTRACTOR) and ourselves on
          (date of execution).

     (2)  The amount demanded hereby represents the overdue obligations of THE
          CONTRACTOR, according to the aforementioned Agreement.

     UNQUOTE 

II.  The amount under this "Stand-By" Letter of Credit shall be reduced in such
     amounts as are to be indicated by (THE AFFILIATE) at the end of each
     calendar quarter from the date on which this "Stand-By" Letter of Credit
     becomes effective, in accordance with paragraph "C", "Other Conditions,"
     below, provided that we (Bank) receive a telex from (THE AFFILIATE),
     stating:

     QUOTE

     We hereby authorize (Bank) to reduce the amount under your "Stand-By"
     Letter of Credit No. __________ in an amount equal to U.S.$ (to be
     indicated by THE AFFILIATE), that represents the portion of the
     obligations already performed by (THE


                                     D - 1
   84

     CONTRACTOR), of the Minimum Work Program, as set forth in the Operating
     Services Agreement entered into between (THE CONTRACTOR) and ourselves on
     (Date of Execution). It is understood that the above-mentioned "Stand-By"
     Letter of Credit shall be in force for the remaining balance of U.S.$(to be
     inserted).

     UNQUOTE

OTHER CONDITIONS

A.   We (Bank) are bound by this "Stand-By" Letter of Credit to pay in an
     irrevocable and absolute manner to THE AFFILIATE upon submission of the
     document mentioned under Condition 1 above.

B.   All Bank fees related to this Letter of Credit are for the account of (THE
     CONTRACTOR).

C.   This Letter of Credit shall be in force for a period of thirty-seven (37)
     months as of the Starting Date of Operations, but not later than
     ________________, ___________, as notified to us through a tested telex by
     the advising bank, in which the advising bank states that it has received
     from THE AFFILIATE a certificate or tested telex containing the Starting
     Date of Operations or a statement indicating that the operations will not
     start on the proposed Starting Date of Operations for reasons imputable to
     THE CONTRACTOR, in accordance with the form of Annex I.

D.   We shall make the payment under the "Stand-By" Letter of Credit in Dollars
     of the United States of America upon submission of the document required
     and without requesting any evidence or condition concerning the accuracy of
     the statements made in such document, and irrespective of whether (THE
     CONTRACTOR) has previously filed a bankruptcy, reorganization or delay
     procedure.

E.   This Credit is subject to the uniform rules and practices for documentary
     credits (revision 1983) of the International Chamber of Commerce,
     Publication 400, except with respect to Article 19 of such rules.
     Thereupon, in the event our activities were interrupted by the reasons
     established in said article, we (Bank) are bound to pay on the first
     banking day following the interruption of such causes the amount to be
     indicated by THE AFFILIATE via telex, as mentioned in Condition 1 above, up
     to an amount not to exceed the one indicated in this "Stand-By" Letter of
     Credit, if the term of this "Stand-By" Letter of Credit shall have expired
     during the interruption of our activities.

F.   References to the Operating Services Agreement or to its terms or
     conditions are made herein only for identification purposes and such
     document is not incorporated to this "Stand-By" Letter of Credit.


                                     D - 2
   85

G.   This tested telex is the operative instrument of credit and shall not be
     further confirmed by mail.




                                     D - 3
   86

                                  APPENDIX "D"

                                    ANNEX I

                         STARTING OPERATIONS CERTIFICATE

I, _________________, the bearer of Identity Card No. ________________, acting
on behalf of Maraven S.A., hereby confirm that the Letter of Credit No. _______
issued in our favor for the account of Compania Occidental de Hidrocarburos,
Inc., will become effective on ____________, 199__, because [the Starting
Date of Operations took place on ______________, 199___ (or) the works did not
commence on the proposed Starting Date of Operations for reasons imputable to
THE CONTRACTOR].

In witness whereof, the undersigned subscribed this certificate or authorizes
this tested telex on _________, 199___.

By:
   -----------------------------
            Maraven S.A.





                                     D - 4
   87

                                  APPENDIX "F"

                         STARTING OPERATIONS CERTIFICATE

I, ________________, the bearer of Identity Card No. _______________, acting on
behalf of (THE AFFILIATE), party of the first part; and ___________________,
acting an behalf of THE CONTRACTOR, party of the second part, in his capacity as
_______________, hereby confirm, as provided in Clause 2.6 of the Operating
Services Agreement for the Unit ______, entered into between the PARTIES, that
the Operating Services corresponding to the mentioned AGREEMENT will start at
_____ on the _____ day of the month of ____________________ 199____. 

In witness whereof, the undersigned subscribed this CERTIFICATE on the _______
day of the month of __________________, 199__.

By THE AFFILIATE                        By THE CONTRACTOR


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


                                      F-1
   88
                                                                       
The undersigned, MARIA ISABEL MARTINEZ GARCIA, Bearer of Venezuelan Identity
Card No. 5.062.225, a Certified Public Interpreter for the English Language of
the Republic of Venezuela, as evidenced by and Official License issued unto her
and published in Official Gazette No. 32686 of March 16th 1983 and registered
at the Main Bureau of Public Registry of Federal District under No. 495, Folio
286, of Protocol 2, Volume 2 on February 24th, 1983 hereby certify that the
attached original document written in Spanish has been submitted to her for
translation and the following is a true English version thereof.

                                 ADDENDUM No. 1

              TO THE OPERATING SERVICES AGREEMENT FOR UNIT D.Z.O.

This Addendum No. 1 to the Operation of Services Agreement for Unit DZO
(hereinafter referred to as the "Addendum") has been held and undersigned on
December seventh (7th) 1994 by MARAVEN, S.A.(hereinafter referred to as "THE
SUBSIDIARY"), on one part, represented by its President Mr. Emilio Abouhamad,
duly authorized as per Bylaws of THE SUBSIDIARY and COMPANIA OCCIDENTAL DE
HIDROCARBUROS, INC. on the other (hereinafter referred to as "THE CONTRACTOR"),
corporation organized and existing under the laws of California, USA,
represented by its President and General Manager, Mr. Carlos del Solar, duly
authorized as per power of attorney registered before the 


Legend 

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

                                                                               1
   89
First Mercantile Registry Office of the Judicial Circumscription of Federal
District and State of Miranda, on May 12, 1994, under No. 58, Volume 3-C PRO:

1.       GENERAL PROVISIONS.

         1.1.    THE SUBSIDIARY AND THE CONTRACTOR undersigned an Operation of
Services Agreement on November 19, 1993 (hereinafter referred to as "THE
AGREEMENT"), under which THE CONTRACTOR operates, under the terms and
conditions therein agreed, the unit DZO (hereinafter referred to as THE UNIT).

         1.2.    The terms defined on Clause 2 of the Agreement that shall be
used on this Addendum and that are not defined herein, shall have the same
meaning assigned by them on the Agreement.  On Article two (2) of this
Addendum, the term "Production of Crude Oil" shall be used with the term
"Production" on Sub clause 2.9 of the Agreement, but referred only to Crude Oil
and not to Natural Gas.

         1.3.     In compliance with Sub clause 19.3 of the Agreement, the
Parties have decided to undersign this Addendum in order to reflect certain
explanations and amendments to the Agreement consistent with the mutual
intention of the Parties and a more efficient operation of the Unit.




                                                                              
                                                                               2
   90
2.       TRANSFERENCE POINT AND CRUDE OIL TRANSPORTATION

         2.1     Unless the parties agree the contrary, The Transference Point
of Crude Oil to all fields, with the exception of Garcia Urdaneta, shall be
relocated to Matapalo and the Transference Point of Natural Gas for all fields
shall be relocated to Los Claros.  Therefore, THE CONTRACTOR shall be
responsible for any additional expansion, as well as of the operation,
maintenance and repairs of the facilities required for the transportation on
Hidrocarbons in the Agreement Area to the Transference Points.

         2.2     In the same manner THE CONTRACTOR agrees to be responsible
for:

                 i)       the construction of a pumping station in Matapalo, in
order to allow the delivery to THE SUBSIDIARY'S crude transportation system,
The Production of Crude Oil in excess to the present capacity of twenty six
thousand barrels per day.

                 ii)      The expansion of the capacity of the transportation
system for the Production of Crude Oil between the Matapalo Station and
Platform PE-2-9, in the event the production exceeds the Transportation
capacity of 40 thousand barrels per day, which is estimated to have that
transportation system, once THE CONTRACTOR builds the pumping station referred
to on the preceding 2.2.(i).  The obligation of THE SUBSIDIARY of receiving
the Production of Crude Oil, in excess of 40 thousand barrels per day, shall be
subject to the construction and 



                                                                              
                                                                               3
   91
adequate conditions of operations by THE CONTRACTOR, of the referred expansion
to the transportation system between Matapalo Station and Platform PE-2-9.

         2.3     The payments incurred by THE CONTRACTOR in fulfillment of the
additional obligations assumed in 2.1 and 2.2 herein shall qualify as Capital
Costs, subject to the conditions stated on Clause 18.5 of the Agreement.

         2.4     It is expressly understood that the operation, maintenance and
repair of the transportation system between Matapalo and Platform PE-2-9
referred to in 2.2 (ii) herein shall be of the sole responsibility of THE
SUBSIDIARY, once THE CONTRACTOR constructs it and places it in adequate
operating conditions.

          2.5    It is expressly understood that the transportation system THE
CONTRACTOR agrees to expand herein indicated shall be for the exclusive use of
the Production of Unit DZO during the term of the Agreement.

3.       REMUNERATION PARAMETERS

         3.1     Taking into account the Effective Date and Operations Starting
Date under the Agreement, the Parties agree that the initial Maximum Total Fee
(MTF) of US $*/Barrel (* of the United States of America per 


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


                                                                               4
 
   92
barrel) set forth on sub clause 18.13 of the Agreement, shall be adjusted in
accordance with the formula contained on the same clause, therefore during the
First Trimester in course shall be the First Trimester of 1994 and the previous
First Trimester shall be the fourth Trimester of 1993.  For the effect of
adjustment for the Incentive in Production Increase of US $*/Barrel (* of the
United States of America per Barrel) set forth on Sub clause 18.17 of the
Agreement, the first Trimester in course shall continue being the first
Trimester of 1993 and the previous first Trimester shall continue being the
fourth Trimester of 1992.  The change made to the Agreement herein was agreed
between the Parties due to commercial and extraordinary causes.  The Parties
agree that the reference dates for the Incentive in Production Increase
aforementioned, shall not be the object of any modification in the future.

         3.2     The provisions set forth on 3.1 herein shall be effective as
of Effective Date of the Agreement.  The remuneration adjustments to THE
CONTRACTOR that shall take place in compliance with this Addendum, shall be
made within thirty (30) days upon reception of the invoice corresponding to the
fourth (4) Trimester of 1994.

4.       SECONDARY RECOVERING PROJECT.

         4.1     THE CONTRACTOR is bound to execute a secondary recovery
project at Marcelina Oil Field, similar to the secondary case referred to in
the August


         * Confidential portion has been omitted pursuant to a request for
           confidential treatment and filed separately with the Commission.
 
                                                                               5

   93
1993 offer rendered to THE SUBSIDIARY, as long as the parties determine that
such project is feasible from the technical and economical point of view for
both Parties.  During the two (2) years following the execution of this
Addendum THE CONTRACTOR agrees to carry out feasibility studies necessary in
order to make a decision on whether or not to proceed with the referred project
on secondary recovery.  In the event such study has been made and the decision
of not to proceed with the referred project on secondary recovery, THE
SUBSIDIARY may request THE CONTRACTOR, when so deemed convenient, that the
above mentioned feasibility studies be updated, updating them and taking the
respective decision, in a term no longer than six (6) months as from the date
the requirement is made in writing to THE SUBSIDIARY.  In the event it is
required, the magnitude of the secondary recovery project shall depend on the
performance of Marcelina oil field and of the results of the pilot project of
water injection that THE CONTRACTOR shall carry out as of the first semester
1995.  The above mentioned secondary recovery project shall be considered
feasible from the economical point of view for THE CONTRACTOR only if the
internal return rate for THE CONTRACTOR is equal or higher to    *    per cent
    *    calculated based on an economic analysis with constant oil prices and
costs not subject to inflation, and at a Product Price Budget equal to the
average of the three (3) Trimesters previous to the date in which the decision
is taken.  In the event the Parties do not reach an agreement in relation to
the technical feasibility of the secondary recovery project the decision shall
be referred to an independent oil 


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



                                                                               6
   94
consulting firm, chosen by mutual consent of the parties. In such case the
professional fees regarding such advise shall be shared by both parties.

         4.2.    The non fulfillment of the obligations herein set forth on
numeral four (4) from the part of THE CONTRACTOR shall be considered as a
substantial non fulfillment of its obligations, as set forth on Clause 5.8.
of the Agreement.

5.       OTHER PROVISIONS

         5.1     The parties agree to modify, according to the present
Addendum, the gravity minimum requirement contained on Attachment "A" of the
Agreement in order to allow the delivery of Crude Oil within a range of 22
degrees to 30 degrees API, with the objective of not limiting the production
and development of Marcelina Oil Field.

         5.2.    The additional activities referred to in this Addendum are
obligatory for THE CONTRACTOR, which shall provide additional amounts that may
result necessary for its execution.  Without prejudice of such obligation, the
amount of the minimum installment referred to in Clauses 5.1 and 5.7 of the
Agreement, shall continue to be US $     *    .oo.

         5.3.    The parties agree to modify, according to the present
Addendum, Sub Clause 6.6 of the Agreement, which shall be drafted as follows:

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


                                                                               7
   95

"THE CONTRACTOR shall conduct and negotiate on behalf of THE SUBSIDIARY, with
its cooperation and support, the obtantion of any permit and/or right of pass,
and/or right of way to third parties needed so that THE CONTRACTOR reaches the
Agreement Area, or on the premises in order to carry out Operation Services set
forth on the Agreement.  THE CONTRACTOR shall inform THE SUBSIDIARY in writing,
with at least two (2) months of Operation among the Agreement Area in
compliance with the Labor Program.  Subject to the conditions herein set forth,
only the payments made by THE CONTRACTOR to third parties regarding such
permits and rights, duly sustained with their respective vouchers, shall be
recovered by THE CONTRACTOR as Capital Cost.

All payments made by THE CONTRACTOR to third parties as set forth on Sub Clause
6.6, shall be made previous authorization of THE SUBSIDIARY in writing.  THE
SUBSIDIARY, shall communicate in writing and in each case, its approval or
objections within the following fifteen (15) working days upon reception of the
approval request from THE CONTRACTOR. Should THE CONTRACTOR does not receive
written communication from THE SUBSIDIARY, during the above mentioned fifteen
(15) working days term, it shall be understood that such payments have been
authorized.

With the exception of a case of negligence from any of the Parties, any delay
in the Operations Services caused by the delay in the obtation of the terms and




                                                                               8
   96
rights referred to in this sub clause, shall not be considered chargeable to
any of the Parties".

         5.4     The parties agree to modify according to the present Addendum,
sub clause 7.9 of the Agreement, which shall be drafted as follows:

"THE SUBSIDIARY shall cooperate with THE CONTRACTOR and shall support the same,
in order to negotiate and complete those agreements with third parties, land
owners and real estate owners among the Area of the Agreement, required in
order to enter the area or other reasonable rights required by THE CONTRACTOR
in order to carry on with the Operation Services herein.  Such rights granted
by third parties to THE SUBSIDIARY, shall be extended to THE CONTRACTOR for the
duration of this Agreement.  Any other reimbursement or administration costs,
organization and man hour incurred by THE SUBSIDIARY in relation to the
referred support or for the obtainment of the aforementioned rights, shall be
on THE CONTRACTORS account, which shall reimburse them to THE SUBSIDIARY within
the next forty five (45) days upon presentation of vouchers referring those
costs, which in turn shall be recovered by THE CONTRACTOR as Capital Costs".

         5.5     The parties agree to clarify, in accordance with the last
paragraph of Sub clause 18.14 of the Agreement, that the interest referred to
on Sub clauses




                                                                               9
   97
18.7 and 18.12 of the Agreement shall be totally charged to and recovered
during each following trimester, as long as the Maximum Total Fee (MTF) so
permits it.

         5.6     The parties agree, according to the present Addendum, to
clarify Sub clause 18.10 of the Agreement, which shall be drafted as per terms
set forth on Attachment "A" herein, which is part of the same.

         5.7     With the exception of clarifications and amendments to the
Agreement herein made, the Parties ratify and confirm the other terms of the
Agreement.

         5.8     This Addendum shall not amend or modified in any aspect, with
the exception of mutual written consent between the Parties.

In witness thereof the Parties have signed two copies of the same tenor and
sole effect, in the city of Caracas, on December seven (7) 1994.

By THE SUBSIDIARY                      By THE CONTRACTOR

(Signed illegible) By:                 (Signed illegible) By: Carlos del Solar

Emilio Abouhamad -  President          President and General Manager




                                                                              10
   98
                                  ATTACHMENT A

                               OF ADDENDUM No. 1
                                       TO
                  OPERATION SERVICES AGREEMENT FOR UNIT D.Z.O.

In accordance with what is set forth on Article 5.6 of the Addendum, THE
SUBSIDIARY and THE CONTRACTOR agree to clarify the terms contained on clause
18.10, which shall be drafted as follows:

"18.10  All cost of THE CONTRACTOR, different to Capital Costs and Non
Capitalized Costs previous to the Production Date, included with no limitation,
operations costs and THE CONTRACTOR'S services fees, may be recovered only
through Operations Fee (OPFee).

OPFee shall be subject to adjustments after the Trimester which includes the
Effective Date of this Agreement as follows:

As of the following Trimester of that which includes the Effective Date of the
Agreement the "US$/Barrel OPFee of THE CONTRACTOR shall be adjusted on a
trimester basis due to inflation, in which manner the OPFee in each Following
Trimester reflects the adjusted value.

The formula US$/Barrel OPFee adjusted due to inflation shall be determined in
accordance with the following formula:

                                            *

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

                                                                              11
   99
*

The procedures above described shall be applied subsequently to the Effective
date of this Agreement.

The above resulting amount of OPFee (N) shall be applied to the three following
formulas.

The OPFee shall be calculated according to the Crude Oil Production delivered
to THE SUBSIDIARY.

Formula 1:       Should the Crude Oil Production volume delivered to THE
                 SUBSIDIARY is              *                .

Formula 2:       Should the Crude Oil Production volume delivered to THE
                 SUBSIDIARY is     *      , the OPFee shall be calculated
                 as per the following formula:

                 *

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


                                                                              12
   100
Formula 3:       Should the Crude Oil Production Volume delivered to THE
                 SUBSIDIARY is higher than Po, the OPFee shall be calculated as
                 per the following formula:

                    *
                    *

(*) The applicable inflation index in order to determine OPFee (N) adjusted to
any Trimester after the Trimester containing the Effective Date of this
Agreement shall be the Special Index Energy (unadjusted) from the Consumer
Price Index for all Urban Consumers (CPI-U), United States City Average (base
period 1982 - 1984 = 100) from the Summary Data from the 

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


                                                                              13
   101
Consumer Price Index News Release as published monthly by the United States
Department of Labor Statistics, Washington DC 20212.

Should the Inflation Index, as indicated monthly in News Release above
described suffers corrections at any time after its publication and use for the
adjustments of OPFee (N), the acceptable reconciliation shall be applied in the
following Trimester.

Should the index for the base period (1982 - 1984 = 100) is revised it must be
clear that the intention of this indention provision is made in order to adjust
in proportion the OPFee (N) to the average of price level of IV Trimester 93 in
the Trimester invoiced using the information of three months of the Trimesters
in course and the Information of the three months of the IV Trimester 93":

The foregoing is a faithful translation of the attached document written in
Spanish, which I have made upon request of the interested, not prejudging about
content or form, in Marcaibo, State of Zulia, Republic of Venezuela on November
10th 1997.

/s/ MARIA ISABEL MARTINEZ GARCIA

Maria Isabel Martinez Garcia
Certified Translator for the English Language



                                                                              14