MEMORANDUM OF UNDERSTANDING BETWEEN ECOPETROL AND
                     THE ASSOCIATED PARTY (AMOCO, HONDO AND OPON)
                         IN THE "OPON" CONTRACT ASSOCIATION.

          This Memorandum of Understanding is made between:  For one party,
          EMPRESA COLOMBIANA DE PETROLEOS - ECOPETROL (hereafter ECOPETROL)
          an industrial and commercial enterprise of the State created by
          law 165 in 1948 and presently controlled by statutes approved by
          means of Decree 1209 of June 15, 1994 with principal office in
          Santafe de Bogota, represented by JUAN MARIA RENDON GUTIERREZ,
          adult, identified by citizenship card number 17,125,100 issued in
          Santafe de Bogota, residing in said city, who in his position as
          President acts in name and representation of said Enterprise,
          duly authorized by the Board of Directors of the same, as stated
          in Act number 2107 of July 11, 1995.  For the other party
          (hereafter "THE ASSOCIATES") AMOCO COLOMBIA PETROLEUM COMPANY
          (hereafter AMOCO) a corporation established in accordance with
          the laws of Delaware, with a branch office established in
          Colombia, as set forth in public deed number 1,953 of March 19,
          1991, executed before Notary No. 5 of Santafe de Bogota D.C.,
          represented by GREGORY P. WILLIAMS, adult, identified by tourist
          card No. 260,005 issued in Santafe de Bogota, residing in said
          city; HONDO MAGDALENA OIL & GAS LIMITED (hereafter HONDO) an
          association established in accordance with the laws of Jersey -
          Channel Islands, with a branch office established in Colombia as
          set forth in public deed number 944 of December 3, 1990 before
          Notary No. 45 of Santafe de Bogota, D.C., represented by JOHN
          JOSEPH HOEY, adult, identified by United States passport No.
          150151531, residing in Santafe de Bogota and OPON DEVELOPMENT
          COMPANY (hereafter OPON DEVELOPMENT), a company established in
          conformity with the laws of Colorado, United States of America,
          with a branch office established in the Republic of Colombia, as
          set forth in public deed number 3,022 of August 21, 1987 before
          Notary No. 11 of Santafe de Bogota, represented by Sergio Rueda
          Ferreira, adult, identified by citizenship card number 2,031,832
          issued in Santafe de Bogota, residing in the same city.


          The Associates form a party of the OPON Association Contract
          ("the Association Contract"), dated the 15th of July, 1987, with
          the modifications agreed upon in relation to the area of the
          contract known as OPON, with the discovery of natural gas known
          as the OPON Field.

          In conformance with the Association Contract, ECOPETROL and the
          Associates have the right to take and separately dispose of their
          proportionate shares of the total volume of hydrocarbons that may
          be produced in the OPON field.

          In accordance with the Association Contract, Ecopetrol has the
          right to participate in the production of the OPON Association,
          pursuant to Clause 9 of the Association Contract, once the
          commerciality of the OPON Field is declared.













          This Memorandum of Understanding contains the basic principles
          for the utilization of the OPON gas arising from the project of
          early production in this field, which will be the subject of a
          detailed agreement between the parties.

          Now, by virtue of the previous considerations, it is agreed:

          A.   The Associates assume the following obligations:

               1.   Complete engineering and design work on pipeline,
                    processing facilities at El Centro and well site
                    facilities. 

               2.   Complete environment assessment on pipeline corridor
                    and wellsite facilities and secure environmental
                    permits. 

               3.   Complete right of way acquisition. 

               4.   Prepare and receive quotes for all construction work. 

               5.   Order miscellaneous material required to produce and
                    deliver gas to Barrancabermeja. 

          B.   Ecopetrol is obligated to: 

               1.   Purchase 40 MMcfd of natural gas from the Opon
                    Association on a take-or-pay basis for a term of 15
                    years to the extent that gas is available.  In
                    addition, Ecopetrol will purchase an additional 40
                    MMcfd of natural gas from the Opon Association on a
                    take-or-pay basis for a term of 3 years to the extent
                    that gas is available.  Ecopetrol shall have the right
                    to make up volumes of gas paid for but not taken from
                    any gas volumes in excess of the contracted volumes
                    that may be transported from the Opon field to
                    Barrancabermeja. 

                    Ecopetrol may at its option jointly market with
                    Associates up to 40 MMcfd to mutually acceptable third
                    party end-users subject to being acceptable in
                    accordance with the CREG Regulations.  Ecopetrol's
                    obligation to purchase 80 MMcfd during the first 3
                    years may be reduced by an amount equal to the take-or-
                    pay volumes delivered to such third party end-users.
                    Ecopetrol's take-or-pay obligation to the Opon
                    Association shall in no event be less than 40 MMcfd for
                    15 years. 





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               2.   Ecopetrol and the Associates will jointly market to
                    third parties all natural gas from the Opon Association
                    Contract Area in excess of the volumes mentioned in
                    Paragraph 1 subject to being acceptable in accordance
                    with the CREG Regulations. 

               3.   Ecopetrol will guarantee gas volumes up to a maximum of
                    40 MMcfd jointly marketed by Ecopetrol and the
                    Associates to third party end-users to the extent that
                    the Associates cannot deliver such volumes and
                    Ecopetrol has the volumes available during the first 3
                    years.  Sales made by Ecopetrol and Associates to third
                    party end-users shall take priority over sales to
                    Ecopetrol's refinery at Barrancabermeja.  

               4.   The price to be paid for natural gas pursuant to the
                    volumes mentioned in Paragraph 1 shall be as follows: 

                    (i)  in accordance to the formula in Exhibit A, plus
                         the tariffs in number 5, part B, of this
                         memorandum; 

                    (ii) for the volume of gas paid for but not taken by
                         Ecopetrol, the formula outlined in Exhibit A, plus
                         the tariffs pursuant to number 5, part B, of this
                         memorandum, that would have been received by the
                         Associates. 

                    However, all parties agree that the pricing will be
                    subject to the maximum gas price permitted under the
                    CREG Regulations.

               5.   The tariffs to be charged to Ecopetrol and/or third
                    parties for natural gas and hydrocarbon liquid
                    transportation from the Opon Field to the refinery at
                    Barrancabermeja will be calculated to be sufficient for
                    the Associates to cover funding cost and provide a
                    thirteen and two tenths percent (13.2%) rate of return
                    after Colombian taxes on pipeline investments
                    (currently estimated to be $56.5 million US) pursuant
                    to Exhibit B. The tariffs pursuant to this Paragraph
                    will be adjusted based on actual pipeline investments,
                    actual operating costs, and actual throughput. 
                  
               6.   The tariff to be paid to Ecopetrol by the Associates
                    will for gas processing be sufficient for Ecopetrol to
                    cover funding costs and provide a thirteen and two
                    tenths percent (13.2%) rate of return after Colombian
                    taxes on the El Centro gas processing plant investments
                    required to handle incremental production from the Opon
                    Field (currently estimated to be $18.2 million US)
                    pursuant to Exhibit C.

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               7.   Ecopetrol and Associates will negotiate in good faith
                    and if mutually acceptable terms are reached execute a
                    gas sales contract as soon possible.

               8.   Associates and Ecopetrol shall have the right to lift
                    and sell domestically or internationally their
                    respective shares of natural gas liquids and condensate
                    produced from the wells and/or processed at El Centro
                    and/or other facilities. However, it is the intention
                    of the Parties to sell from the Opon Field the
                    condensate and natural gas liquids produced at the gas
                    processing facility at El Centro to Ecopetrol. The
                    Parties agree to negotiate a mutually acceptable sales
                    contract for the condensate and natural gas liquids as
                    soon as possible.

               9.   Associates agree to pay all costs incurred prior to
                    July 1, 1995, up to a maximum of 10% of the pipeline
                    costs (currently estimated to be $56.5 million US).
                    Ecopetrol's share of these costs will be reimbursed
                    from the production from the wells pursuant to the
                    Association Contract. Once the field is declared
                    commercial, all costs incurred after July 1, 1995 for
                    the pipeline costs will be paid in cash by Ecopetrol
                    and Associates in the proportions contemplated pursuant
                    to the Association Contract.        
                                     
                    Wellhead and facilities costs for the Opon #3 and #4
                    wells will be reimbursed twenty percent (20%) in kind
                    and eighty percent (80%) in cash once such costs are
                    incurred and commerciality is  declared. 
                      
               10.  In the event Opon #4 results are not geologically
                    satisfactory to the Associates and as a result
                    Ecopetrol and the Associates decide not to proceed with
                    the pipeline, then Ecopetrol shall reimburse Associates
                    100% of the pipe costs and 50% of associated expenses
                    which estimate of costs and associated expenses is
                    attached as Exhibit D. In that event, Ecopetrol shall
                    have ownership of the pipe. 

                    In the event Opon #4 results are not geologically
                    satisfactory to the Associates, and Ecopetrol
                    constructs the pipeline and one or more of the
                    Associates do not participate, the Associates that do
                    not participate agree to negotiate in good faith a
                    tariff arrangement for the transportation and
                    processing of natural gas and the transportation of
                    hydrocarbon liquids. Such tariff shall be sufficient
                    for Ecopetrol to cover its investment on behalf of the
                    non-participating Associates and provide a thirteen and
                    two tenths percent (13.2%) rate of return after

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                    Colombian taxes on such investment. In the event Amoco
                    does not participate, then Ecopetrol shall reimburse
                    Amoco 100% of the pipe cost and 100% of associated
                    expenses which estimate of costs and associated
                    expenses is attached as Exhibit D. In that event,
                    Ecopetrol shall have ownership of the pipe.

                    In the event the Opon #4 is not successful for
                    mechanical reasons and the La Paz formation is not
                    reached, the Associates agree to drill a replacement
                    well for Opon #4 pursuant to the Association Contract
                    and in that event, the Associates and Ecopetrol agree
                    to proceed with the installation of a pipeline as
                    defined herein. 
           
               11.  If Associates are required to pay any new or increased
                    taxes, duties, fees, or other charges related to
                    natural gas sales and/or transportation to any entity
                    of Colombia that adversely effect Associates after the
                    effective date of the Gas Sales Contract, then
                    Ecopetrol shall reimburse associates for any such
                    payments made by Associates. 

               12.  Ecopetrol shall be bound by the terms of this
                    Memorandum of Understanding whether or not Ecopetrol
                    agrees the OPON Field is commercial pursuant to Clause
                    9.1 of the Association Contract.

               13.  The terms agreed upon in numbers 1, 2, 3, 4, 7, 8, 10
                    (second paragraph) and 11 of part B are totally
                    independent of the obligations originally assumed in
                    the OPON Association Contract.

          The parties agree to cooperate and use due diligence in
          completing the project so that gas can be delivered to
          Barrancabermeja as early as possible in 1996. 

          This Memorandum of Understanding has been executed in Santafe de
          Bogota, on the 26th day of July, 1995. 
            
          /s/ Gregory P. Williams
          AMOCO COLOMBIA PETROLEUM COMPANY

          /s/ John J. Hoey
          HONDO MAGDALENA OIL & GAS LIMITED

          /s/ Sergio Rueda F.        
          OPON DEVELOPMENT COMPANY

          /s/ Juan Maria Rendon
          EMPRESA COLOMBIANA DE PETROLEOS         
                    ECOPETROL

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                                      EXHIBIT A

          FORMULA FOR FIXING THE PRICE OF GAS ON A MMBTU EQUIVALENT BASIS

          The liquidation of the price of natural gas will be made in
          accordance with the following formula:

               P1 = Po x (FO1/FOo), where P1 is the price in dollars per
          million BTU (US$/MBTU) to be fixed for the semester; Po is the
          price (US$/MBTU) in effect during the previous semester; FO1 is
          the average computed of the export price of fuel oil of ECOPETROL
          (FOB Cartagena) during the semester immediately previous to the
          one for which the price will be established; FOo is the average
          computed of the price of fuel oil (FOB Cartagena) during the same
          semester of the year previous to the one for which the price will
          be established.  The value of Po, for the first semester of 1995,
          was US$1.03/MBTU.  The value of FO1, for the first semester of
          1995, was US$14.68/barrel.  The value of FOo for the second
          semester of 1994, was $12.87/barrel.  The price will be
          readjusted each semester on the first day of the months of
          January and July of each year.  After the lst of July, 1995, the
          calculation will be made using two decimal numbers and the result
          will be rounded off in such a way that the cents of a dollar will
          be rounded to the nearest when the thousandths are equal to or
          more than 5 and will be left same (equal) when the thousandths
          are less than 5.

          The payment will be made in United States of America dollars up
          to a maximum of seventy-five (75%) percent of the price of
          unassociated natural gas that is processed and produced in
          Colombia.

           




















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