AVIVA PETROLEUM INC /TX/
10-K405, 1997-03-17
CRUDE PETROLEUM & NATURAL GAS
Previous: NATIONAL PICTURE & FRAME CO, 10-Q, 1997-03-17
Next: MERRILL LYNCH COLORADO MUNICIPAL BOND FUND OF THE MLMSMST, N-30D, 1997-03-17



<PAGE>
 
               UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 10-K

[ X ]           ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                   SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

               For the fiscal year ended      DECEMBER 31, 1996
                                           ------------------------

                                      OR

[   ]         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                  SECURITIES EXCHANGE ACT OF 1934 [NO FEE REQUIRED]

                   For the transition period from        to
                                                  ------    ------

                        Commission File Number  0-22258

                             AVIVA PETROLEUM INC.
            (Exact name of registrant as specified in its charter)
TEXAS                                                           75-1432205
(State or other jurisdiction of                              (I.R.S. Employer
incorporation or organization)                            Identification Number)

8235 DOUGLAS AVENUE,                                              75225
SUITE 400, DALLAS, TEXAS                                        (Zip Code)
(Address of principal executive offices)

                                (214) 691-3464
             (Registrant's telephone number, including area code)

          Securities registered pursuant to Section 12(b) of the Act:

                                                Names of each exchange
                                                ----------------------
        Title of each class                     on which registered
        -------------------                     -------------------
        Depositary Receipts,                    American Stock Exchange
        each representing five shares of
        Common Stock, without par value

          Securities registered pursuant to Section 12(g) of the Act:

                        Common Stock, without par value

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.  Yes   x   No      .
                                        -----    -----

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.   x  .
           -----

The aggregate market value of voting securities held by non-affiliates of the
Registrant on February 28, 1997 was approximately $19,153,000.  As of such date,
the last sale price on the American Stock Exchange of a Depositary Share
representing five shares of Common Stock, without par value ("Common Stock"),
was U.S. $3.38, and the middle market price of Common Stock on the London Stock
Exchange Limited was U.K. 34 pence.

As of February 28, 1997, 31,482,716 shares of Registrant's Common Stock were
outstanding, of which 10,324,615 shares of Common Stock were represented by
Depositary Shares.

                      DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the Registrant's definitive Proxy Statement for the 1997
Annual Meeting of Shareholders are incorporated in Part III by reference.
<PAGE>
 
                         TABLE OF CONTENTS TO FORM 10-K

<TABLE>
<CAPTION>
                                                                            Page
                                                                           -----
Part I
<S>                                                                        <C> 

  Item 1.  Business
              General......................................................    1
              Current Operations...........................................    1
              Risks Associated with the Company's Business.................    2
              Products, Markets and Methods of Distribution................    4
              Regulation...................................................    5
              Competition..................................................    9
              Employees....................................................    9
  Item 2.  Properties
              Productive Wells and Drilling Activity.......................   10
              Undeveloped Acreage..........................................   11
              Title to Properties..........................................   11
              Federal Leases...............................................   11
              Reserves and Future Net Cash Flows...........................   12
              Production, Sales Prices and Costs...........................   12
              Significant Properties
                  Colombia.................................................   13
                  United States............................................   16
  Item 3.  Legal Proceedings...............................................   17
  Item 4.  Submission of Matters to a Vote of Security Holders.............   17

Part II

  Item 5.  Market for Registrant's Common Equity and Related Stockholder 
              Matters Price Range of Depositary Shares and Common Stock....   18
              Dividend History and Restrictions............................   19
  Item 6.  Selected Financial Data.........................................   20
  Item 7.  Management's Discussion and Analysis of Financial Condition and
              Results of Operations
              Results of Operations........................................   21
              Liquidity and Capital Resources..............................   23
  Item 8.  Financial Statements and Supplementary Data.....................   26
  Item 9.  Changes in and Disagreements with Accountants on Accounting
              and Financial Disclosure.....................................   26

Part III

  Item 10. Directors and Executive Officers of the Registrant..............   27
  Item 11. Executive Compensation..........................................   27
  Item 12. Security Ownership of Certain Beneficial Owners and Management..   27
  Item 13. Certain Relationships and Related Transactions..................   27

Part IV

  Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K.   28

Signatures.................................................................   34

</TABLE>

                                      (i)
<PAGE>
 
                                    PART I

ITEM 1. BUSINESS


General

  Aviva Petroleum Inc. (referred to collectively with its consolidated
subsidiaries as the "Company"), a Texas corporation, through its subsidiaries,
is engaged in the exploration for and production and development of oil and gas
in Colombia and offshore in the United States. The Company was incorporated in
1973 and the common stock, without par value ("Common Stock"), of the Company
has been traded on the London Stock Exchange Limited (the "London Stock
Exchange") since 1982. Depositary shares ("Depositary Shares"), each
representing the beneficial ownership of five shares of Common Stock, have
traded on the Primary List of the American Stock Exchange since May 31, 1995,
and prior to that on the Emerging Company Marketplace of the American Stock
Exchange since November 14, 1994.  The Company's principal executive offices are
located in Dallas, Texas, and the Company maintains a field office in Venice,
Louisiana.

Current Operations

  Colombia. Through a wholly owned subsidiary, the Company is the owner of
  --------                                                                
interests in, and is engaged in exploration for, and development and production
of oil from, four concessions granted by Empresa Colombiana de Petroleos, the
Colombian national oil company ("Ecopetrol").

  The Company's Colombian activities are carried out pursuant to four joint
operating agreements between the Company's wholly owned subsidiary, Neo Energy,
Inc. ("Neo"), and co-owner Argosy Energy International ("Argosy"), which
operates the Colombian properties and is an affiliate of Garnet Resources
Corporation ("Garnet").  Neither Garnet nor Argosy is affiliated with the
Company.  Neo has a 45% interest and Argosy has the remaining 55% interest in
properties covered by the four joint operating agreements.  Neo and Argosy are
parties to four concession agreements with Ecopetrol called Santana, La Fragua,
Yuruyaco and Aporte Putumayo.  All four concessions are located in the Putumayo
Basin of southwestern Colombia.  The Company's exploration and development
activities are currently concentrated in the Santana and Yuruyaco concessions.

  Twenty wells have been drilled on the Santana concession.  Of the thirteen
exploratory wells, seven have been productive and six were dry holes. Of the
seven development wells, five have been productive.  Drilling of an eighth
development well commenced on February 25, 1997.  Four fields have been
discovered and have been declared commercial by Ecopetrol.  Gross production
from the Santana concession has totaled approximately 8.8 million barrels during
the period from April 1992, when production commenced, through December 1996.
The Company's share of this production totaled approximately 1.5 million
barrels.

  The contract for the La Fragua concession, which adjoins Santana to the north,
was approved by Ecopetrol in June 1992.  The acquisition of seismic data
required in the first two years of the contract has been completed.  The Company
has determined, however, that further exploration on this concession is not
technically justified and the concession will likely be surrendered.  See "Item
2.  Properties -- Significant Properties -- Colombia."

  The contract for the Yuruyaco concession, which is adjacent to the eastern
boundaries of the Santana and La Fragua concessions, was approved by Ecopetrol
in September 1995.  The Yuruyaco contract requires in the first and second
contract years seismic surveys totaling 19 and 12 miles, respectively.  A 2-D
seismic program was initiated in late December 1996 that will satisfy such
obligations.  If the Company decides to proceed into the third year, the
drilling of a test well would be required.

                                       1
<PAGE>
 
  The Aporte Putumayo block has produced since 1976.  Declining production has,
however, caused the block to be unprofitable under the terms of the contract.
Neo and Argosy have, accordingly, notified Ecopetrol that they intend to
relinquish this block pursuant to the terms of the concession agreement.
Production from the Aporte Putumayo block was shutin effective March 31, 1995,
and abandonment and restoration operations are continuing.

  Each concession is governed by a separate contract with Ecopetrol.  Generally,
the contracts cover a 28-year period and require certain exploration
expenditures in the early years of the contract and, in the later years of the
contract, permit exploitation of reserves that have been found.  All of the
contracts provide that Ecopetrol shall receive, on behalf of the Colombian
Ministry of Mines, royalty payments in the amount of 20% of the gross proceeds
of the oil produced pursuant to the respective contract, less certain costs of
transporting the oil to the point of sale.  Under each of the contracts,
application must be made to Ecopetrol for a declaration of commerciality for
each discovery. If Ecopetrol declares the discovery commercial, it has the right
to a 50% reversionary interest in the field and is required to pay 50% of all
future costs.  If, alternatively, Ecopetrol declines to declare the discovery
commercial, Neo and Argosy have the right to proceed with development and
production at their own expense until such time as they have recovered 200% of
the costs incurred, at which time Ecopetrol is entitled to back in for a 50%
working interest in the field without payment or reimbursement of any historical
costs. Exploration costs (as defined in the concession agreements) incurred by
the co-owners prior to the declaration of commerciality are recovered by means
of retention by the co-owners of all of the non-royalty proceeds of production
from each well until costs relating to that well are recovered.

  United States.  In the United States the Company, through its wholly owned
  -------------                                                             
subsidiary, Aviva America, Inc. ("AAI"), is engaged in the production of oil and
gas attributable to its working interests in 16 offshore wells and, until
December 23, 1996, approximately 350 onshore wells which were sold for
$2,702,000 in cash, net of closing adjustments. For further information as to
the sale of these assets, see Notes 1 and 10 of Notes to Consolidated Financial
Statements. The Company acquired its interests in most of these wells through
the acquisition of producing properties.

  On December 23, 1996, the Company completed the sale of all of its U.S.
onshore oil and gas properties which were located primarily in Pennsylvania,
Oklahoma and Wyoming. The Company now operates its remaining U.S. oil and gas
properties, which are in the Gulf of Mexico offshore Louisiana, at Main Pass 41
and Breton Sound 31 fields.

Risks Associated with the Company's Business

  General.    The Company's operations are subject to oil field operating
  -------                                                                
hazards such as fires, explosions, blowouts, cratering and oil spills, any of
which can cause loss of hydrocarbons, personal injury and loss of life, and can
severely damage or destroy equipment, suspend drilling operations and cause
substantial damage to subsurface structures, surrounding areas or property of
others.  As protection against operating hazards, the Company maintains broad
insurance coverage, including indemnity insurance covering well control,
redrilling and cleanup and containment expenses, Outer Continental Shelf Lands
Act coverage, physical damage on certain risks, employers' liability,
comprehensive general liability, appropriate auto and marine liability and
workers' compensation insurance.  The Company believes that such insurance
coverage is customary for companies engaged in similar operations, but the
Company may not be fully insured against various of the foregoing risks, because
such risks are either not fully insurable or the cost of insurance is
prohibitive.  The Company does not carry business interruption insurance because
of the prohibitively high cost.  The occurrence of an uninsured hazardous event
could have a material adverse effect on the financial condition of the Company.

  Colombia.    The Company has expended significant amounts of capital for the
  --------                                                                    
acquisition, exploration and development of its Colombian properties and plans
to expend additional capital for exploration and 

                                       2
<PAGE>
 
development of such properties. Even if the results of such activities are
favorable, further drilling at significant costs must be conducted to determine
the extent of the recoverable reserves. Failure to fund capital expenditures
could result in forfeiture of all or part of the Company's interests in the
applicable property. For additional information on the Company's concession
obligations, see "-- Current Operations," and regarding its cash requirements,
see "Item 7. Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Liquidity and Capital Resources."

  In addition, the Company's ability to continue its Colombian exploration and
development programs is dependent upon the ability of its co-owner to finance
its portion of such costs and expenses.  There can be no assurance that the
Company's co-owner will be in a position to pay, or provide for the payment of,
its costs and expenses of joint projects.  If the Company's co-owner cannot fund
its obligations, the Company may be required to accept an assignment of the co-
owner's interest therein and assume those funding obligations.  If, thereafter,
the Company were to be unable to raise sufficient funds to meet such
obligations, the Company's interests in the affected properties may be
forfeited.  Moreover, even if the Company were to be able to raise sufficient
funds, there could be no assurance that the Company would be able to discover,
develop and produce sufficient reserves to recover the costs and expenses
incurred in connection with the exploration and development thereof.  In reports
filed with the Securities and Exchange Commission, which are publicly available,
Garnet has expressed its belief that it will be able to fund its share of
capital expenditures relating to these properties through cash flow from
production in Colombia and its existing working capital.

  The Company is subject to the other risks inherent in the ownership and
development of foreign properties including, without limitation, cancellation or
renegotiation of contracts, royalty and tax increases, retroactive tax claims,
expropriation, adverse changes in currency values, foreign exchange controls,
import and export regulations, environmental controls and other laws,
regulations or international developments that may adversely affect the
Company's properties.   The Company does not maintain political risk insurance.

  Exploration and development of the Company's Colombian properties are
dependent upon obtaining appropriate governmental approvals and permits. See "--
Regulation." The Company's Colombian operations are also subject to price risk.
See "-- Products, Markets and Methods of Distribution."

  There are logistical problems, costs and risks in conducting oil and gas
activities in remote, rugged and primitive regions in Colombia.  The Company's
operations are also exposed to potentially detrimental activities by local
insurgents.  In late 1990, the Colombian Government Armed Forces launched an
aggressive effort to confront the leftist guerrillas who have operated within
Colombia for many years.  This military operation occurred on several fronts
throughout the country.  The guerrillas in the Putumayo area, where the
Company's property is located, responded to these attacks by retaliating against
several private companies.  As a result of these retaliatory raids, the Company
experienced two incidents in which damage to its drilling rig was sustained and
a contractor's helicopter was destroyed.  Although the Company's losses on those
occasions were substantially recovered through insurance, there can be no
assurance that such coverage will remain available or affordable.  Although
unrelated incidents have continued to occur in the vicinity of the Company's
operations, including political protests by local residents that temporarily
suspended production for approximately eight days during December 1994 and
approximately nine days in August 1996, the level of guerrilla activity subsided
in the first quarter of 1991 and the Company has not been the target of any
significant guerrilla activity since then.  Nonetheless, the Colombian army
guards the Company's operations and there can be no assurance that the Company's
operations in Colombia will not be the target of similar attacks in the future.

  United States.    The Company's activities in the United States are subject to
  -------------                                                                 
a variety of risks.  The  U.S. properties could, in certain circumstances,
require expenditure of significant amounts of capital.  Failure to fund its
share of such costs could result in a diminution of value of, or under
applicable operating agreements  forfeiture of, the Company's interest.  The
Company's ability to fund such expenditures is also 

                                       3
<PAGE>
 
dependent upon the ability of the other working interest owners to fund their
share of the costs. If such working interest owners fail to do so, the Company
could be required to pay its proportionate share or forego further development
of such properties. The Company's activities in the United States are subject to
various environmental regulations and to price risk. See "-- Regulation" and "--
Products, Markets and Methods of Distribution."

  Information concerning the amounts of revenue, operating loss and identifiable
assets attributable to each of the Company's geographic areas is set forth in
Note 11 of the Notes to Consolidated Financial Statements contained elsewhere
herein.

Products, Markets and Methods of Distribution

  Colombia.    The Company's oil is sold pursuant to sales contracts with
  --------                                                               
Ecopetrol. The contracts generally provide for cancellation by either party with
notice. In the event of cancellation by Ecopetrol, the Company may export its
oil production. Ecopetrol has historically purchased the Company's production,
but there can be no assurance that it will continue to do so, nor can there be
any assurance of ready markets for the Colombian production if Ecopetrol does
not elect to purchase the production. The Company currently produces no natural
gas in Colombia. See "Item 2. Properties."

  During each of the three years ended December 31, 1996, the Company received
more than 10% of its revenue from Ecopetrol.  Sales to Ecopetrol accounted for
$9,437,000, or 68.6% of oil and gas revenue for 1996, $7,132,000, or 65.3% of
oil and gas revenue for 1995 and $3,404,000, or 39.8% of oil and gas revenue for
1994, representing the Company's entire Colombian oil revenue.  If Ecopetrol
were to elect not to purchase the Company's Colombian oil production, the
Company believes that other purchasers could be found for such production.

  United States.   The Company does not refine or otherwise process domestic
  -------------                                                             
crude oil and condensate production. The domestic oil and condensate it produces
are sold to refineries and oil transmission companies at posted field prices in
the area where production occurs. The Company does not have long term contracts
with purchasers of its domestic oil and condensate production. The Company's
domestic gas production is primarily sold under short term arrangements at or
close to spot prices. Some gas is committed to be processed through certain
plants. The Company has not historically hedged any of its domestic production.

  During 1996, 1995 and 1994, the Company received more than 10% of its revenue
from one domestic purchaser.  Such revenue accounted for $1,609,000, or 11.7% of
oil and gas revenue for 1996, $1,422,000, or 13.0% of oil and gas revenue for
1995 and $1,144,000, or 13.4% of oil and gas revenue for 1994.  If this
purchaser were to elect not to purchase the Company's oil and gas production,
the Company believes that other purchasers could be found for such production.

  General.  Oil and gas are the Company's only products.  There is substantial
  -------                                                                     
uncertainty as to the prices that the Company may receive for production from
its existing oil and gas reserves or from oil and gas reserves, if any, which
the Company may discover or purchase.  The availability of a ready market and
the prices received for oil and gas produced depend upon numerous factors beyond
the control of the Company including, without limitation, adequate
transportation facilities (such as pipelines), marketing of competitive fuels,
fluctuating market demand, governmental regulation and world political and
economic developments.  World oil and gas markets are highly volatile and
shortage or surplus conditions substantially affect prices.  As a result, there
have been dramatic swings in both oil and gas prices in recent years.  From time
to time there may exist a surplus of oil or natural gas supplies, the effect of
which may be to reduce the amount or price of hydrocarbons that the Company may
produce and sell while such surplus exists.

                                       4
<PAGE>
 
Regulation

  Environmental Regulation.  The Company's operations are subject to foreign,
  ------------------------                                                   
federal, state, and local laws and regulations governing the discharge of
materials into the environment or otherwise relating to environmental
protection.  These laws and regulations may require the acquisition of a permit
by operators before drilling commences, restrict the types, quantities, and
concentration of various substances that can be released into the environment in
connection with drilling and production activities, limit or prohibit drilling
activities on certain lands lying within wilderness areas, wetlands, and other
protected areas, require remedial measures to mitigate pollution from former
operations, such as plugging and abandoning wells, and impose substantial
liabilities for pollution resulting from the Company's operations.  The
regulatory burden on the oil and gas industry increases the cost of doing
business and consequently affects its profitability.  Changes in environmental
laws and regulations occur frequently, and any changes that result in more
stringent and costly waste handling, disposal, remedial, drilling, or
operational requirements could have a significant impact on the operating costs
of the Company, as well as significantly impair the Company's ability to compete
with larger, more highly capitalized companies.  Management believes that the
Company is in substantial compliance with current applicable environmental laws
and regulations and that continued compliance with existing requirements will
not have a material impact on the Company's operations, capital expenditures,
and earnings.  Management further believes, however, that risks of substantial
costs and liabilities are inherent in oil and gas operations, and there can be
no assurance that significant costs and liabilities will not be incurred.

       Colombia.  Any significant exploration or development of the Company's
       --------                                                              
Colombian concessions, such as conducting a seismic program, the drilling of an
exploratory or developmental well or the construction of a pipeline, requires
environmental review and the advance issuance of environmental permits by the
Colombian government. In 1993, Instituto de Recursos Naturales y Ambiente
("Inderena"), the Colombian federal environmental agency, began reviewing the
environmental standards and permitting processes for the oil industry in
general, and in 1994 a new Ministry of the Environment was organized. In
connection with its review, Inderena requested that additional environmental
studies be submitted for the Company's area of operations north of the Caqueta
River. See "Item 2. Properties -- Significant Properties -- Colombia -- Santana
Concession." As a result of the review and requests for additional environmental
studies, the Company's operations north of the Caqueta River were suspended
pending review and approval of additional environmental studies submitted by the
Company in January 1994 and the issuance of environmental licenses by the
Ministry of the Environment. In May 1994, the suspension was lifted and certain
of the required environmental licenses were issued, including a permit allowing
the co-owners of the concession to conduct a seismic program in that area. Since
the lifting of the above referenced suspension, the co-owners have received
subsequent permits, without substantial delay, to drill development and
exploratory wells, construct related production facilities and construct a 10-
mile pipeline. There can be, however, no assurance that the Company will not
experience future delays in obtaining necessary environmental licenses. See also
"Item 7. Management's Discussion and Analysis of Financial Condition and Results
of Operations -- Liquidity and Capital Resources" and "Item 2. Properties --
Significant Properties -- Colombia."

          United States.   The Company believes that it is currently in
          -------------                                                
substantial compliance with U.S. federal, state, and local environmental laws
and regulations.  The Company has experienced no material financial effects to
date from compliance with these U.S. environmental laws or regulations and does
not currently plan any significant capital expenditures for U.S. environmental
control efforts.

  The Oil Pollution Act of 1990 ("OPA '90") and regulations thereunder impose a
variety of requirements on "responsible parties" related to the prevention of
oil spills and liability for damages resulting from such spills in waters of the
United States. A "responsible party" includes the owner or operator of a
facility or vessel, or the lessee or permittee of the area in which an offshore
facility is located. OPA '90 assigns liability to each responsible party for oil
spill removal costs and a variety of public and private damages from oil spills.
While liability limits apply in some circumstances, a party cannot take
advantage of liability 

                                       5
<PAGE>
 
limits if the spill is caused by gross negligence or willful misconduct, the
spill resulted from violation of a federal safety, construction, or operating
regulation, or a party fails to report a spill or to cooperate fully in the
cleanup. Few defenses exist to the liability imposed under OPA '90 for oil
spills. The failure to comply with these requirements or inadequate cooperation
in a spill event may subject a responsible party to civil or criminal
enforcement actions. Management of the Company is currently unaware of any oil
spills for which the Company has been designated as a responsible party under
OPA '90 and that will have a material adverse impact on the Company or its
operations. OPA '90 also imposes ongoing requirements on facility operators,
such as the preparation of an oil spill contingency plan. The Company has such
plans in place.

  With recent amendments to OPA '90 signed into law by President Clinton on
October 19, 1996, OPA '90 now requires responsible parties to establish and
maintain $35 million in financial responsibility to cover environmental cleanup
and restoration costs that might be incurred in connection with an oil spill in
waters of the United States, including the waters of the Gulf of Mexico where
the Company has its operations, unless a formal risk assessment indicates that
increased financial responsibility coverage is warranted.  The Company's two
U.S. properties, Main Pass Block 41 field, a federal lease on the outer
continental shelf ("OCS") offshore Louisiana, and Breton Sound Block 31 field,
on state leases offshore Louisiana, are subject to OPA '90 as amended.
Management of the Company believes that these two properties comply in all
material respects with the amended OPA '90 requirements.

  The Outer Continental Shelf Lands Act ("OCSLA") imposes a variety of
requirements relating to safety and environmental protection on lessees and
permittees operating on the OCS.  Specific design and operational standards may
apply to OCS vessels, rigs, platforms, vehicles, and structures.  Violations of
lease conditions or regulations issued pursuant to OCSLA can result in
substantial civil and criminal penalties, as well as potential court injunctions
curtailing operations and the cancellation of leases.  Such enforcement
liabilities can result from either governmental or private prosecution.

  With respect to the Federal Water Pollution Control Act, the United States
Environmental Protection Agency ("EPA") issued regulations prohibiting the
discharge of produced water and produced sand derived from oil and gas
operations in certain coastal areas (primarily state waters) of Louisiana and
Texas, effective February 8, 1995.  In connection with these regulations,
however, the EPA also issued an administrative order that effectively delayed
compliance with the no discharge requirement for produced water until January 1,
1997.  Effective August 27, 1996, the Louisiana Department of Environmental
Quality ("LDEQ") officially assumed responsibility for compliance and
enforcement issues for produced water as they relate to the Company's Breton
Sound Block 31 facilities with the EPA operating in an oversight capacity.  On
December 30, 1996, the LDEQ adopted an emergency rule which, among other things,
provided an extension of time, to July 1, 1997, to achieve compliance with the
prohibitions against produced water discharges.  The Company has filed an
application pursuant to the emergency rule that, if approved, would allow the
Company to continue with its current operations until January 1, 1999.  Failing
approval, or further extension of the deadline, the Company will be required to
reinject the produced water into a suitable underground formation.  Management
of the Company does not expect the incremental cost to prepare and operate a
reinjection well to have a material adverse effect on the Company's operating
results.  See "Item 2. Properties -- Significant Properties -- United States."

  The Comprehensive Environmental Response, Compensation, and Liability Act
("CERCLA"), also known as the "Superfund" law, imposes liability, without regard
to fault or the legality of the original conduct, on certain classes of persons
that are considered responsible for the release of a "hazardous substance" into
the environment.  These persons include the owner or operator of the disposal
site or sites where the release occurred and companies that disposed or arranged
for the disposal of hazardous substances found at the site.  Persons who are or
were responsible for releases of hazardous substances under CERCLA may be
subject to joint and several liability for the costs of cleaning up the
hazardous substances that have been released into the environment and for
damages to natural resources, and it is not uncommon for neighboring landowners
and other third parties to file claims for personal injury and 

                                       6
<PAGE>
 
property damage allegedly caused by the hazardous substances released into the
environment. The Company has not received any notification nor is it otherwise
aware of circumstances indicating that it may be potentially responsible for
cleanup costs under CERCLA.

  The federal Resource Conservation and Recovery Act ("RCRA") and comparable
state statutes regulate the storage, treatment and disposal of wastes, including
hazardous wastes.  The EPA and various state agencies have limited the approved
methods of disposal for certain hazardous and nonhazardous wastes, thereby
making such disposal more costly.  Furthermore, certain wastes generated by the
Company's oil and natural gas operations that are currently exempt from
treatment as hazardous wastes may in the future be designated as hazardous
wastes and therefore be subject to more rigorous and costly operating and
disposal requirements.

  Other Regulation - Colombia.  The Company's Colombian operations are regulated
  ---------------------------                                                   
by Ecopetrol, the Ministry of Mines and Energy, and the Ministry of the
Environment, among others.  The review of current environmental laws,
regulations and the administration and enforcement thereof, or the passage of
new environmental laws or regulations in Colombia, could result in substantial
costs and liabilities in the future or in delays in obtaining the necessary
permits to conduct the Company's operations in that country.  These operations
may also be affected from time to time in varying degrees by political
developments in Colombia.  Such political developments could result in
cancellation or significant modification of the Company's contract rights with
respect to such properties, or could result in tax increases and/or retroactive
tax claims being assessed against the Company.

  Other Regulation - United States.  Domestic exploration for and production and
  --------------------------------                                              
sale of oil and gas are extensively regulated at both the national and local
levels.  Legislation affecting the oil and gas industry is under constant review
for amendment or expansion, frequently increasing the regulatory burden.  Also,
numerous departments and agencies, both federal and state, are authorized by
statute to issue, and have issued, rules and regulations applicable to the oil
and gas industry that are often difficult and costly to comply with and that may
carry substantial penalties for failure to comply.  The regulations also
generally specify, among other things, the extent to which acreage may be
acquired or relinquished, permits necessary for drilling of wells, spacing of
wells, measures required for preventing waste of oil and gas resources and, in
some cases, rates of production and sales prices to be charged to purchasers.
The heavy and increasing regulatory burdens on the oil and gas industry increase
the costs of doing business and, consequently, affect profitability.

  Sales of domestic crude oil and condensate can be made by the Company at
market prices not subject to price controls at this time.  Prior to January 1,
1993, the sale of certain categories of domestic natural gas by the Company was
subject to regulation under the Natural Gas Act ("NGA"), as amended, and the
Natural Gas Policy Act of 1978, as amended.  The  Natural Gas Wellhead Decontrol
Act of 1989 removed all NGA price and non-price controls which affected wellhead
sales of natural gas.

  Commencing in April 1992, the Federal Energy Regulatory Commission ("FERC")
issued Orders numbered 636, 636-A, and 636-B ("Order No. 636"), which require
interstate pipelines to provide transportation separate,  or "unbundled," from
the pipelines' sales of gas.  Also, Order No. 636 requires pipelines to provide
open-access transportation on a basis that is equal for all gas supplies.
Although Order No. 636 does not directly regulate the Company's activities, the
FERC has stated that it intends for Order No. 636 to foster increased
competition within all phases of the natural gas industry.  It is unclear what
impact, if any, increased competition within the natural gas industry under
Order No. 636 will have on the Company's activities.  Although Order No. 636,
assuming it is upheld in its entirety in litigation initiated by parties not
affiliated with the Company, could provide the Company with additional market
access and more fairly applied transportation service rates, Order No. 636 could
also subject the Company to more restrictive pipeline imbalance tolerances and
greater penalties for violation of those tolerances.  The FERC has issued final
orders in all Order No. 636 pipeline restructuring proceedings.  The United
States Court of Appeals for the District of Columbia Circuit ("D.C. Circuit")
has generally affirmed Order 

                                       7
<PAGE>
 
No. 636 and remanded certain issues for further explanation or clarification.
The issues remanded for further action do not appear to materially affect the
Company. Numerous petitions for review of the individual pipeline restructuring
orders are currently pending in that court. Although it is difficult to predict
when all appeals of pipeline restructuring orders will be completed or their
impact on the Company, the Company does not believe that it will be affected by
the restructuring rule and orders any differently than other natural gas
producers and marketers with which it competes.

  The FERC has announced several important transportation-related policy
statements and proposed rule changes, including the appropriate manner in which
interstate pipelines release capacity under Order No. 636 and, more recently,
the price that shippers can charge for their released capacity.  In addition, in
1995, the FERC issued a policy statement on how interstate natural gas pipelines
can recover the costs of new pipeline facilities.  In January 1996, the FERC
issued a policy statement and a request for comments concerning alternatives to
its traditional cost-of-service ratemaking methodology.  A number of pipelines
have obtained FERC authorization to charge negotiated rates as one such
alternative.  While any additional FERC action on these matters would affect the
Company only indirectly, any new rules and policy statements may have the effect
of enhancing competition in natural gas markets by, among other things,
encouraging non-producer natural gas marketers to engage in certain purchase and
sale transactions.  The Company cannot predict what action the FERC will take on
these matters, nor can it accurately predict whether the FERC's actions will
achieve the goal of increasing competition in markets in which the Company's
natural gas is sold.  However, the Company does not believe that it will be
affected by any action taken materially differently than other natural gas
producers with which it competes.

  The Outer Continental Shelf Lands Act ("OCSLA") requires that all pipelines
operating on or across the Outer Continental Shelf ("OCS") provide open-access,
non-discriminatory service.  Although the FERC has chosen not to impose the
regulations of Order No. 509, in which the FERC implemented The OCSLA, with
respect to gatherers and other non-jurisdictional entities, the FERC has
retained the authority to exercise jurisdiction over those entities if necessary
to permit non-discriminatory access to service on the OCS.

  A portion of the Company's operations are located on federal oil and gas
leases, which are administered by the United States Department of the Interior
Minerals Management Service ("MMS").  Such leases are issued through competitive
bidding, contain relatively standardized terms and require compliance with
detailed MMS regulations and orders pursuant to the OCSLA.  In addition to
permits required from other agencies, lessees must obtain a permit from the MMS
prior to commencement of drilling.  To cover the various obligations of lessees
on the OCS, the MMS generally requires that lessees have substantial net worth
or post substantial bonds or other acceptable assurances that such obligations
will be met.  The cost of such bonds or other surety can be substantial and
there is no assurance that bonds or other surety can be obtained in all cases.

  The MMS is conducting an inquiry into certain agreements from which producers
on MMS leases have received settlement proceeds that are royalty bearing and the
extent to which producers have paid the appropriate royalties on those proceeds.
The Company believes that this inquiry will not have a material impact on its
financial condition, liquidity or results of operations.

  The MMS issued a notice of proposed rulemaking in which it proposes to amend
its regulations governing the calculation of royalties and the valuation of
natural gas produced from federal leases.  The principal feature in this
proposed rule would establish an alternative market-index based method to
calculate royalties on certain natural gas production sold pursuant to non-
arm's-length sales contracts.  In addition, the MMS recently issued a notice of
proposed rulemaking in which it proposes to amend its regulations governing the
calculation of royalties and the valuation of crude oil produced from federal
leases.  The principal features in this proposed rule would modify the valuation
procedures for both arm's-length and non-arm's-length crude oil transactions to
decrease reliance on crude oil posted prices and assign a value to crude oil
that better reflects market value, establish a new MMS form for collecting value
differential data, and amend the valuation procedure for the sale of federal
royalty oil.  The Company 

                                       8
<PAGE>
 
cannot predict what action the MMS will take on these matters, nor can it
predict at this stage in the rulemaking proceeding how the Company might be
affected by these amendments to the MMS' regulations.

  Sales of crude oil, condensate and gas liquids by the Company are not
currently regulated and are made at market prices.  Effective as of January 1,
1995, the FERC implemented regulations establishing an indexing system for
transportation rates for oil that could increase the cost of transporting oil to
the purchaser.  The Company is not able to predict what effect, if any, this
order will have on it, but other factors being equal, it may tend to increase
transportation costs or reduce wellhead prices for oil.

  State Regulation.  Production of any domestic oil and gas by the Company is
  ----------------                                                           
affected by state regulations.  Many states in which the Company has operated
have statutory provisions regulating the production and sale of oil and gas,
including provisions regarding deliverability.  Such statutes, and the
regulations promulgated in connection therewith, are generally intended to
prevent waste of oil and gas and to protect correlative rights to produce oil
and gas between owners of a common reservoir.  Certain state regulatory
authorities also regulate the amount of oil and gas produced by assigning
allowable rates of production to each well or proration unit.

  The Company cannot accurately predict the effect that any of the
aforementioned orders or the challenges to the orders will have on the Company's
operations.  Additional proposals and proceedings that might affect the oil and
natural gas industries are pending before Congress, the FERC and the courts.
These include Congressional energy bills and executive branch energy initiatives
which have as their goal the decreased reliance by the United States on foreign
energy supplies.  The Company cannot accurately predict when or whether any such
proposals or proceedings may become effective.

Competition

  The Company encounters strong competition from other independent operators and
from major oil companies in acquiring properties suitable for exploration, in
contracting for drilling equipment and in securing trained personnel.  Many of
these competitors have financial and other resources substantially greater than
those available to the Company.

  The Company's ability to discover reserves in the future depends on its
ability to select, generate and acquire suitable prospects for future
exploration.  The Company does not currently generate its own prospects and
depends exclusively upon external sources for the generation of oil and gas
prospects.

Employees

  As of December 31, 1996, Aviva had 10 full-time employees, all in the United
States.

                                       9
<PAGE>
 
ITEM 2. PROPERTIES


Productive Wells and Drilling Activity

  The following table summarizes the Company's developed acreage and productive
wells at December 31, 1996.  "Gross" refers to the total acres or wells in which
the Company has a working interest, and "net" refers to gross acres or wells
multiplied by the percentage working interest owned by the Company.
<TABLE> 
<CAPTION> 

Developed Acreage /(1)/
                                               Gross          Net
                                            --------     --------
             <S>                            <C>          <C>
             United States                     3,240        1,482
             Colombia                         79,965       35,118
                                            --------     --------
                                              83,205       36,600
                                            ========     ========
</TABLE> 
<TABLE> 
<CAPTION> 
 
Productive Wells /(2)/
                                            Oil             Gas
                                      --------------  --------------
 
                                       Gross     Net   Gross     Net
                                      ------  ------  ------  ------
             <S>                      <C>     <C>     <C>     <C>
             United States /(3)/          10    5.21       6    2.69
             Colombia                     12    1.89       -       -
                                      ------  ------  ------  ------
                                          22    7.10       6    2.69
                                      ======  ======  ======  ======
</TABLE> 
(1)  Developed acreage is acreage assignable to productive wells.
(2)  Productive wells represent producing wells and wells capable of producing.
(3)  Two of the oil wells and one of the gas wells are dually completed.


  During the periods indicated, the Company drilled or participated in the
drilling of the following development and exploratory wells.
<TABLE> 
<CAPTION> 
                                           Net Wells Drilled
                                       -------------------------
 
                                  Development               Exploratory
                           -----------------------   -----------------------
 
                           Productive          Dry   Productive          Dry
                           ----------   ----------   ----------   ----------   
   <S>                     <C>          <C>          <C>          <C>  
   1996   United States           0.4            -            -            -
          Colombia                0.3            -            -          0.3
                           ----------   ----------   ----------   ----------   
          Total                   0.7            -            -          0.3
                           ==========   ==========   ==========   ==========   
                                                          
   1995   United States           0.1            -            -            -
          Colombia                0.5          0.2            -          0.3
                           ----------   ----------   ----------   ----------   
          Total                   0.6          0.2            -          0.3
                           ==========   ==========   ==========   ==========   
                                                          
   1994   United States           0.1            -            -            -
          Colombia                  -            -            -          0.3
                           ----------   ----------   ----------   ----------   
          Total                   0.1            -            -          0.3
                           ==========   ==========   ==========   ==========   
</TABLE> 
 
  In addition, at March 17, 1997, there was one gross (0.2 net) development well
in progress in Colombia.

                                       10
<PAGE>
 
  In the above table, a productive well is an exploratory or development well
that is not a dry well. A dry well is an exploratory or a development well found
to be incapable of producing either oil or gas in commercial quantities. A
development well is a well drilled within the proved area of an oil and gas
reservoir to the depth of a stratigraphic horizon known to be productive. An
exploratory well is any well that is not a development well.

Undeveloped Acreage

  The Company's undeveloped acreage in Colombia is held pursuant to concession
agreements with the Colombian government.  These agreements may, by operations
of their terms, require the relinquishment of certain portions of the
undeveloped acreage in 1997.  See "-- Significant Properties."

  The Company does not have an undeveloped acreage position in the United States
because of the costs of maintaining such a position.  Oil and gas leases in the
United States generally can be acquired by the Company for specific prospects on
reasonable terms either directly or through farmout arrangements.

  The following table shows the undeveloped acreage held by the Company in
Colombia at December 31, 1996.  Undeveloped acreage is acreage on which wells
have not been drilled or completed to a point that would permit the production
of commercial quantities of oil and gas, regardless of whether such acreage
contains proved reserves.
<TABLE> 
<CAPTION> 
                                               Undeveloped Acres
                                             ---------------------

                                               Gross           Net
                                             -------       -------
                        <S>                  <C>           <C> 
                        Colombia             153,987        69,295
</TABLE> 
Title to Properties

  The Company has not performed a title examination for offshore U.S. leases in
federal waters because title emanates from the United States government.  Title
examinations also are not performed in Colombia, where mineral title emanates
from the national government.  The Company believes that it generally has
satisfactory title to all of its oil and gas properties.  The Company's working
interests are subject to customary royalty and overriding royalty interests
generally created in connection with their acquisition, liens incident to
operating agreements, liens for current taxes and other burdens and minor liens,
encumbrances, easements and restrictions.  The Company believes that none of
such burdens materially detracts from the value of such properties or its
interest therein or will materially interfere with the use of the properties in
the operation of the Company's business.

Federal Leases

  The Company conducts a portion of its operations on federal oil and gas leases
and therefore must comply with numerous additional regulatory restrictions,
including certain nondiscrimination statutes.  Certain of the Company's
operations on federal leases must be conducted pursuant to appropriate permits
or approvals issued by various federal agencies.  Pursuant to certain federal
leases, approval of certain operations must be obtained from one or more
government agencies prior to the commencement of such operation.  Federal leases
are subject to extensive regulation.  See "Item 1. Business -- Regulation."

                                       11
<PAGE>
 
Reserves and Future Net Cash Flows

  See Supplementary Information Related to Oil and Gas Producing Activities in
"Item 8.  Financial Statements and Supplementary Data" for information with
respect to the Company's reserves and future net cash flows.

  The Company will file with the Department of Energy (the "DOE") a statement
with respect to the Company's estimate of proved oil and gas reserves as of
December 31, 1996, that is not the same as that included in the estimate of
proved oil and gas reserves as of December 31, 1996, as set forth in "Item 8.
Financial Statements and Supplementary Data" elsewhere herein.  The information
filed with the DOE includes the estimated proved reserves of the properties of
which the Company is the operator, whereas the estimated proved reserves
contained in Item 8 hereof include only the Company's percentage share of the
estimated proved reserves of all properties in which the Company has an
interest.

Production, Sales Prices and Costs

  The following table summarizes the Company's oil production in thousands of
barrels and natural gas production in millions of cubic feet for the years
indicated:
<TABLE> 
<CAPTION> 
 
                                              Year ended December 31,
                                            ---------------------------
 
                                               1996      1995      1994
                                            -------   -------   -------
<S>                                         <C>       <C>       <C> 
Oil /(1)/    United States                       94       106        99
             Colombia                           476       435       250
                                                                 
Gas          United States                    1,146     1,184     1,839
             Colombia                             -         -         -
</TABLE> 
                                                                 
(1)  Includes crude oil and condensate.

                                       12
<PAGE>
 
  The average sales price per barrel of oil and per thousand cubic feet ("MCF")
of gas produced by the Company and the average production (lifting) cost per
dollar of oil and gas revenue and per barrel of oil equivalent (6 MCF: 1 barrel)
were as follows for the years indicated:

<TABLE>
<CAPTION>
                                                                             Year ended December 31, /(1)/
                                                                        --------------------------------------
                                                                  
                                                                          1996            1995            1994
                                                                        ------          ------          ------
<S>                                                <C>                  <C>             <C>             <C>
Average sales price per barrel of oil /(2)/        United States        $20.68          $16.78          $15.40
                                                   Colombia             $19.82          $16.39          $13.60
                                                                                                
Average sales price per MCF of gas                 United States        $ 2.07          $ 1.70          $ 1.97
                                                   Colombia             $    -          $    -          $    -
                                                                                                
Average production cost per dollar of                                                           
  oil and gas revenue                              United States        $ 0.45          $ 0.52          $ 0.43
                                                   Colombia             $ 0.31          $ 0.44          $ 0.67
Average production cost per barrel of                                                           
  oil equivalent                                   United States        $ 6.76          $ 6.46          $ 5.50
                                                   Colombia             $ 6.11          $ 7.15          $ 9.15
</TABLE>

(1)  All amounts are stated in United States dollars.
(2)  Includes crude oil and condensate.

Significant Properties

  Colombia.
  -------- 
  The Company's Colombian properties consist of four concessions, all of which
are located in the Putumayo Basin in southwestern Colombia along the eastern
front of the eastern cordillera of the Andes Mountains.  The Company has a 45%
working interest in each of the concessions, which is subject to various
reversionary interests in favor of Ecopetrol as described below.  Argosy, as
operator of the properties, carries out the program of operations for the four
concessions.  The program is determined, with consideration of the obligations
contained in the concession agreements, by an operating committee comprised of
two representatives from each of Argosy and Neo.  The Aporte Putumayo
concession, which consists of approximately 77,000 acres and contains three
shutin wells, has been in effect since 1972 and is currently being abandoned.
The Santana concession, which consists of approximately 86,000 acres and
contains 12 producing wells, has been in effect since 1987.  No wells have yet
been drilled on the La Fragua or Yuruyaco concessions, which consist of
approximately 32,000 acres and 39,000 acres, respectively.  The La Fragua
concession has been in effect since 1992, whereas the Yuruyaco concession was
acquired in 1995.  The Santana, La Fragua and Yuruyaco concessions are
contiguous, while the Aporte Putumayo concession is approximately 50 kilometers
to the southwest of the Santana concession.

  Production from the concessions is sold pursuant to sales contracts with
Ecopetrol.  Although sales prices vary between concessions, the contracts
generally provide that 25% of the sales proceeds will be paid in Colombian
pesos.  As a result of certain currency restrictions, pesos resulting from these
payments must generally remain in Colombia and are used by the Company to pay
local expenses.

  Neo's pretax income from Colombian sources, as defined under Colombian law, is
subject to Colombian income taxes at a statutory rate of 35% (37.5% prior to
1996), although a "presumptive" minimum income tax based on net assets, as
defined under Colombian law, may apply in years of little or no net income.
Neo's income after Colombian income taxes is subject to a Colombian remittance
tax that accrues at a rate of 12% (10% for 1997 and 7% thereafter).  Payment of
the remittance tax may be deferred under certain 

                                       13
<PAGE>
 
circumstances if Neo reinvests such income in Colombia. See Note 7 of the Notes
to Consolidated Financial Statements contained elsewhere herein.

  The Colombian government also imposes a production tax which averaged
approximately $1.33 per barrel during 1996 and is equal to 7% of the oil price
in effect through December 1997 for three of the four fields in the Santana
concession.  For the remaining field, the production tax is effective through
2000 at 7%, 5.5%, 4% and 2.5% of the oil price for 1997, 1998, 1999 and 2000,
respectively.  Any new discoveries declared commercial by Ecopetrol will be
exempt from the production tax.

     Santana Concession.         The Santana concession is subject to a "risk-
     ------------------                                                      
sharing" contract pursuant to which Ecopetrol has the option to participate on
the basis of a 30% working interest in exploration activities in the concession.
If a commercial field is discovered,  Ecopetrol's working interest increases to
50% and the costs theretofore incurred and attributable to the 20% working
interest differential will be recouped by the co-owners from Ecopetrol's share
of production on a well by well basis.  The risk-sharing contract provides that,
when 7 million barrels of cumulative production from the concession have been
attained, Ecopetrol's revenue interest and share of operating costs increases to
65% but it remains obligated for only 50% of capital expenditures.  In mid-June
1996, the 7 million barrel threshold was reached.  At that time, the Company's
revenue interest in the concession declined from 18% to 12.6% and its share of
operating expenses declined from 22.5% to 15.75%.

  The Santana concession is divided by the Caqueta River.  Two fields located
south of the river, the Toroyaco and Linda fields, were declared commercial by
Ecopetrol and commenced production in 1992.  There are currently four producing
wells in the Toroyaco field and three producing wells in the Linda field. During
1995, a 3-D seismic survey covering the Toroyaco and Linda fields was completed.
Based on this survey, one development well was drilled in each field during 1996
and one additional development location for each field has been identified for
drilling in 1997.

  The Company and its co-owner ("Co-owners") constructed a 42-kilometer pipeline
(the "Uchupayaco Pipeline") which was completed and commenced operations during
1994 to transport oil production from the Toroyaco and Linda fields to the
Trans-Andean Pipeline owned by Ecopetrol, through which the Company's production
is transported to the port of Tumaco on the Pacific coast of Colombia.  The
Uchupayaco Pipeline replaced a trucking operation that transported oil
production from the fields to the Trans-Andean Pipeline.

  Two additional fields, the Mary and Miraflor fields, were discovered north of
the Caqueta River and were declared commercial by Ecopetrol during 1993.  Except
for oil produced during production tests of wells located in these fields, the
production was shutin until the first quarter of 1995 when construction of a
pipeline was completed and commercial production began.  With the completion of
this pipeline, the Co-owners have direct pipeline access from all four fields to
the Pacific coast port of Tumaco.  There are currently four producing wells in
the Mary field and one producing well in the Miraflor field.  A 3-D seismic
survey has recently been completed over the Mary and Miraflor fields and such
data is currently being interpreted.  This survey is expected to define the
limits of these fields, identify possible locations for additional development
wells, and ascertain the prospectivity of areas adjacent to the Mary and
Miraflor fields.  At the present time, the Co-owners anticipate drilling at
least one additional development well in the Miraflor field during the fourth
quarter of 1997.

  During 1996 the Co-owners drilled one exploratory well, the Palmera #1, on the
Santana concession.  The well encountered water-bearing sands in the principal
zones of interest and was plugged and abandoned.

  The Co-owners have fulfilled all the initial exploration obligations required
by the Santana risk-sharing contract.  The contract requires that the Co-owners
submit work programs for approval by Ecopetrol for each of the next two years of
the contract.  The current work program contemplates the drilling of certain

                                       14
<PAGE>
 
development wells (one of which is currently in progress) and completing the
above referenced 3-D seismic program.

  In 1993, the Co-owners relinquished 50% of the original Santana concession
area in accordance with the terms of the contract.  In July 1995, an additional
25% of the original contract area was relinquished.  A final relinquishment is
required in 1997 such that all remaining contract areas except for those areas
within five kilometers of a commercial field or an area under development must
be relinquished.

  Production from the Santana concession has been sold to Ecopetrol pursuant to
a sales contract that became effective January 1, 1995 and was extended through
January 31, 1997 (the "1996 Sales Contract").  Prices under the contract are
determined differently depending on whether (in the discretion of Ecopetrol) the
produced crude is exported.  If the crude is exported, the price received by the
Company is the export price less specified handling and commercialization
charges and subject to an adjustment (specified in the contract) for the quality
of the produced crude as compared with the overall pipeline blend at the point
of export (the "Pipeline Blend Adjustment").  If the crude is not exported, the
price received by the Company is the previous month's average posted price for
Cano Limon crude less specified handling and transportation charges and subject
to (i) the Pipeline Blend Adjustment and (ii) an adjustment for the quality of
the overall pipeline blend at the point of sale as compared with the quality of
Cano Limon crude (the "Cano Limon Adjustment").  Under the contract, the Cano
Limon Adjustment is based on a comparative analysis performed by a specified
independent engineer.  That analysis, which was performed in March of 1996,
determined that the Cano Limon Adjustment is a decrease of $0.56 per barrel.  In
1996, Ecopetrol exported the crude each month, with the exception of November,
and the sales price averaged $19.82 per barrel.

  At December 31, 1996, the date as of which the standardized measure of
discounted future net cash flows applicable to the Company's proved oil and gas
reserves was prepared, Ecopetrol was exporting the crude oil.    Accordingly,
for purposes of determining the standardized measure applicable to the Company's
Colombian reserves, the Company used the export price of $22.60 per barrel
(which does not include the Cano Limon adjustment).

  If Ecopetrol had not been exporting the crude oil at December 31, 1996,  the
standardized measure applicable to the Company's Colombian reserves at December
31, 1996 would have been approximately $37.8 million rather than $38.7 million.
Such decrease would not have resulted in a ceiling test write-down of the
Company's Colombian oil and gas properties.

  During February 1997, the Company entered into a new sales contract (the "1997
Sales Contract") with Ecopetrol that became effective February 1, 1997 and
continues through December 31, 1997.  The terms of the 1997 Sales Contract are
similar to the 1996 Sales Contract.

     La Fragua Concession. The La Fragua concession is subject to an
     --------------------                                           
"association" contract whereunder the Co-owners fulfill all exploration
obligations without Ecopetrol's participation until a field is declared
commercial, as described above.  The association contract also provides that
Ecopetrol's working interest increases on a sliding scale from 50% to 70% as
cumulative production from the concession increases from 60 million barrels to
150 million barrels.

  The Co-owners have completed their seismic obligations for the first two years
of the La Fragua concession and were obligated to acquire additional seismic
data for the third year.  The Co-owners have determined, however, that it was
not technically justified to explore this concession further and, accordingly,
requested and received from Ecopetrol a change of commitment that would allow
the Co-owners to substitute certain exploratory expenditures within the Santana
concession for the remaining seismic commitment on the La Fragua concession.
The indigenous people of the new commitment area, however, have objected to the
proposed exploratory work and it appears unlikely that the Co-owners will be
able to comply with the new commitment.  Management of the Company believes that
the Co-owners have no further obligation with respect to this concession and,
accordingly, have requested that Ecopetrol 

                                       15
<PAGE>
 
allow the Co-owners to surrender the concession without further expenditure.
Management of the Company believes that Ecopetrol will agree to such request,
although there can be no assurance of that.

     Yuruyaco Concession.  The Yuruyaco concession, acquired by the Company in
     --------------------                                                     
September 1995,  is an "association" contract whereunder the Company and its co-
owner fulfill all exploration obligations without Ecopetrol's participation
until a field is declared commercial by Ecopetrol.  At such time, Ecopetrol will
earn a 50% share in the commercial field and must reimburse its 50% share of
successful exploratory wells, seismic and stratigraphic wells, dry step-out
exploratory wells and development wells and facilities through its 50% share of
production.  The contract also provides that Ecopetrol's working interest will
be 50% up to 60 million barrels.  For production in excess of 60 million
barrels, Ecopetrol's interest will increase from 50% to 75%,  based on a measure
of profitability as defined in the contract.

  The contract obligations of the Yuruyaco association contract require the Co-
owners to perform in the first and second contract years seismic surveys
totaling 19 and 12 miles, respectively.  A 2-D seismic program was initiated in
late December 1996 that will satisfy such obligations.  If the Co-owners decide
to proceed into the third year, the drilling of a test well would be required.

     Aporte Putumayo Concession.  The discoveries on the Aporte Putumayo
     --------------------------                                         
concession were not declared commercial by Ecopetrol and the properties have
been operated by Argosy and Neo without participation by Ecopetrol.  There are
no remaining exploration obligations under this contract.  In a letter dated
December 1, 1993, the Company and its co-owner notified Ecopetrol of their
intention to relinquish the concession to Ecopetrol as provided in the contract.
Ecopetrol has accepted the relinquishment, which is pending the completion of
abandonment and restoration operations.

  United States.
  ------------- 
  The Company's oil and gas properties in the United States are located in the
Gulf of Mexico offshore Louisiana at Main Pass 41 and Breton Sound 31 fields.
Both of these properties are operated by the Company.

  Main Pass Block 41 is a federal lease located approximately 25 miles east of
Venice, Louisiana, in 50 feet of water. During 1996, the Company successfully
completed one development well and recompleted one existing well bringing the
number of productive wells in the field up to six.  The field's 1996 production
averaged 58 barrels of oil per day and 685 MCF per day, net to the Company's
interest, from eight completions in four sands between 6,000 and 7,500 feet.
The Company owns a 35% interest in this field.  Main Pass Block 41 represents
approximately 67% of the Company's total net U.S. proved reserves at January 1,
1997.

  Breton Sound Block 31 is located 20 miles offshore Louisiana in 16 feet of
water.  The field is approximately 55 miles southeast of New Orleans on state
leases.  During 1996, seven wells averaged 153 barrels of oil per day and 85 MCF
of gas per day, net to the Company's interest, from two sands completed between
5,500 feet and 6,500 feet. The Company's interests in the leases comprising the
field vary from 41% to 67%.  Breton Sound Block 31 Field represents
approximately 33% of the Company's total net proved U.S. reserves at January 1,
1997.

  The interpretation of 3-D seismic data in 1996 has identified two deep and
several shallow prospects in the Breton Sound 31 field.  The Company is
currently discussing plans with prospective industry partners to farm-in to the
Company's acreage by drilling one or more exploratory wells that would test the
deep prospects.  As for the shallow prospects, the Company anticipates that it
will drill at least one exploratory well; however, formal plans have not been
finalized.

  The Company leases corporate office space in Dallas, Texas containing
approximately 5,100 square feet pursuant to a lease which expires in January
1999.  The lease is cancelable in January 1998.  The annual lease payments for
these offices are $77,000.

                                       16
<PAGE>
 
ITEM 3. LEGAL PROCEEDINGS


  There are no legal proceedings to which the Company is a party or to which its
properties are subject which are, in the opinion of management, likely to have a
material adverse effect on the Company's results of operations or financial
condition.



ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS


  There were no matters submitted to a vote of security holders during the
fourth quarter of the Company's fiscal year ended December 31, 1996.

                                       17
<PAGE>
 
                                    PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
         MATTERS.


Price Range of Depositary Shares and Common Stock

  The Company's Depositary Shares, each representing the beneficial ownership of
five shares of Common Stock, have been admitted to trading on the American Stock
Exchange Emerging Company Marketplace since November 14, 1994 and on the Primary
List of the American Stock Exchange since May 31, 1995 (collectively the "ASE").
In addition, the Company's Common Stock has been traded on the London Stock
Exchange since 1982 and has been quoted in the National Quotation Bureau's Daily
Quotation Sheets (known as the "pink sheets") since December 1993.

  The following table sets forth, for the periods indicated and subject to the
following qualifications, the high and low prices for the Depositary Shares on
the ASE and the high and low prices for the Common Stock on the London Stock
Exchange.

  In the United States, trading of Depositary Shares on the ASE and of Common
Stock through the pink sheets has been limited. During 1996, only an aggregate
of 812,500 Depositary Shares were traded on the ASE.

  In the United Kingdom, the average daily trading volume of the Common Stock on
the London Stock Exchange during 1996 was approximately 65,000 shares.  The
London Stock Exchange prices indicated in the table are the middle market prices
for the Common Stock as published in the Daily Official List and do not
represent actual transactions.  Prices on the London Stock Exchange are
expressed in British pounds sterling, and, accordingly, the prices for the
Common Stock traded on the London Stock Exchange included in the following table
are similarly expressed.  For ease of reference, these prices are also expressed
in U.S. dollars, having been converted using the exchange rate in effect on the
first day on which the stock price attained the high or low price indicated.

                                       18
<PAGE>
 
<TABLE>
<CAPTION>
                                              1996                               1995                             1994
                                     -----------------------           -----------------------           -----------------------
                                       High              Low             High              Low             High              Low
                                     ------           ------           ------           ------           ------           ------
<S>                                  <C>              <C>              <C>              <C>              <C>              <C>
 
ASE
- ---
Depositary Shares /(1)/
- -----------------------
First Quarter                        $ 4.38            $3.88            $6.13            $5.13            $   -            $   -
Second Quarter                       $11.38            $3.50            $7.38            $5.13            $   -            $   -
Third Quarter                        $ 6.25            $3.00            $5.38            $4.00            $   -            $   -
Fourth Quarter                       $ 5.75            $3.00            $4.88            $4.25            $5.13            $4.75
 
London Stock Exchange
- ---------------------
Common Stock
- ------------
 
First Quarter
     (Pounds)              (Pounds)    0.46  (Pounds)   0.34  (Pounds)   0.55  (Pounds)   0.47  (Pounds)   0.66  (Pounds)   0.51
     US$                             $ 0.71            $0.52            $0.87            $0.73            $0.98            $0.76
 
Second Quarter
     (Pounds)              (Pounds)    0.41  (Pounds)   0.25  (Pounds)   0.58  (Pounds)   0.53  (Pounds)   0.58  (Pounds)   0.50
     US$                             $ 0.63            $0.38            $0.93            $0.84            $0.86            $0.75
 
Third Quarter
     (Pounds)              (Pounds)    0.34  (Pounds)   0.25  (Pounds)   0.53  (Pounds)   0.45  (Pounds)   0.50  (Pounds)   0.43
     US$                             $ 0.53            $0.38            $0.85            $0.71            $0.77            $0.66
 
Fourth Quarter
     (Pounds)              (Pounds)    0.41  (Pounds)   0.28  (Pounds)   0.55  (Pounds)   0.38  (Pounds)   0.65  (Pounds)   0.46
     US$                             $ 0.67            $0.43            $0.85            $0.59            $1.06            $0.73
</TABLE>

(1) Representing five shares of Common Stock.

  As of February 28, 1997, the Company had approximately 5,800 shareholders of
record, including nominees for an undetermined number of beneficial holders.
 
Dividend History and Restrictions

  No dividends have been paid since June 1983, nor is there any current
intention on the part of the directors of the Company to pay dividends in the
future.
 
  Furthermore, in July 1993, the Company entered into a credit agreement
pursuant to which the Company is prohibited from paying dividends.  See "Item 7.
Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources."

                                       19
<PAGE>
 
ITEM 6. SELECTED FINANCIAL DATA


  The following table summarizes certain selected financial data with respect to
the Company for, and as of the end of, each of the five years ended December 31,
1996, which should be read in conjunction with the Consolidated Financial
Statements included elsewhere herein.

<TABLE> 
<CAPTION> 
                                            For the Years Ended
                                                December 31,
                             ------------------------------------------------
                              1996      1995      1994      1993       1992
                             -------   -------   -------   -------   --------
                                      (in thousands, except per share, 
                                        per barrel and per MCF data)
<S>                          <C>       <C>       <C>       <C>       <C>
For the period
  Revenues                   $13,750   $10,928   $ 8,546   $10,682   $ 10,418   
  Loss before extraordinary                                          
    item and cumulative                                              
    effect of accounting
    change                   $  (937)  $(2,689)  $(2,460)  $(1,963)  $(10,226)
  Extraordinary item -                                               
    debt extinguishment      $     -   $     -   $     -   $  (341)  $      -
  Cumulative effect to                                               
    January 1, 1993 of                                               
    change in accounting
    for taxes                $     -   $     -   $     -   $  (330)  $      -
  Net loss                   $  (937)  $(2,689)  $(2,460)  $(2,634)  $(10,226)
  Loss before extraordinary                                          
    item and cumulative                                              
    effect of accounting                                             
     change                                                          
    per common share         $ (0.03)  $ (0.09)  $ (0.08)  $ (0.08)  $  (1.24)
  Net loss                                                           
    per common share         $ (0.03)  $ (0.09)  $ (0.08)  $ (0.11)  $  (1.24)
  Weighted average                                                   
    shares outstanding        31,483    31,483    31,483    24,756      8,277
  Cash dividends per                                                 
    common share             $     -   $     -   $     -   $     -   $      -
  Total annual net oil                                             
    production (barrels)                                           
      Colombia                   476       435       250       279        181
      United States               94       106        99       109        130
      Canada                       -         -         -         -         17
                             -------   -------   -------   -------   --------
       Total                     570       541       349       388        328
                             -------   -------   -------   -------   --------
                                                                   
  Total annual net gas                                             
    production (MCF)                                               
      United States            1,146     1,184     1,839     2,324      2,469
      Canada                       -         -         -         -         82
                             -------   -------   -------   -------   --------
       Total                   1,146     1,184     1,839     2,324      2,551
                             -------   -------   -------   -------   --------
                                                                   
  Average price per barrel                                         
    of oil                                                         
      Colombia               $ 19.82   $ 16.39   $ 13.60   $ 14.02   $  14.88
      United States          $ 20.68   $ 16.78   $ 15.40   $ 16.90   $  19.44  
      Canada                 $     -   $     -   $     -   $     -   $  19.45  
  Average price per MCF of                                         
    gas                                                            
      United States          $  2.07   $  1.70   $  1.97   $  2.12   $   1.92   
      Canada                 $     -   $     -   $     -   $     -   $   1.56   
                                                                   
At period end                                                      
  Total assets               $42,944   $45,460   $42,383   $45,017   $ 45,688 
  Long term debt, including                                        
    current portion          $ 7,990   $13,067   $ 6,640   $ 5,476   $ 17,217 
  Stockholders' equity       $26,230   $27,167   $29,856   $32,316   $ 23,805 
</TABLE>

                                       20
<PAGE>
 
  Effective January 1, 1993, the Company adopted Statement of Financial
Accounting Standards No. 109 ("Statement 109"), without restatement of prior
periods. Statement 109 requires recognition of deferred tax assets in certain
circumstances and deferred tax liabilities for the future tax consequences of
temporary differences between the financial statement carrying amounts and the
tax bases of assets and liabilities. In connection with the application of the
full cost method, the Company recorded a ceiling test write-down of oil and gas
properties of $6,471,000 in 1992 (see Note 1 of Notes to Consolidated Financial
Statements). The Company's Canadian operations were sold in 1991 and 1992.



ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
        RESULTS OF OPERATIONS.


  The following discussion and analysis should be read in conjunction with the
Consolidated Financial Statements included elsewhere herein.
 
Results of Operations

1996 versus 1995
- ----------------
 
<TABLE> 
<CAPTION> 
                                  United States    Colombia
                                   Oil     Gas        Oil     Total
                                 ------   ------   --------  -------
       (Thousands)                                         
<S>                              <C>      <C>       <C>      <C>
                                                           
       Revenue - 1995            $1,781   $2,015    $7,132   $10,928
                                                           
       Volume variance             (206)     (99)      671       366
                                                           
       Price variance               365      422     1,634     2,421
                                                           
       Other                          -       35         -        35
                                 ------   ------    ------   -------
                                                           
       Revenue - 1996            $1,940   $2,373    $9,437   $13,750
                                 ======   ======    ======   =======
</TABLE>

  Colombian oil volumes were 476,000 barrels in 1996, an increase of 41,000
barrels over 1995.  Of such increase, approximately 110,000 barrels resulted
from a fracture stimulation program involving eight wells that was completed in
February 1996, net of normal production declines, and approximately 20,000
barrels resulted from the completion of two development wells in the latter part
of 1996, offset by a decrease of approximately 90,000 barrels resulting from the
Company's net revenue interest declining from 18% to 12.6% in mid-June 1996 when
cumulative production from the concession reached the 7 million barrel threshold
specified in the Santana risk-sharing contract.

  U.S. oil volumes were 94,000 barrels in 1996, down approximately 12,000
barrels from 1995. This decrease resulted primarily from normal production
declines. U.S. gas volumes before gas balancing adjustments were 1,136,000
thousand cubic feet ("MCF") in 1996, a decrease of 62,000 MCF from 1995,
resulting primarily from normal production declines, partially offset by new
production from a development well completed at Main Pass 41 during October
1996.

  Included in 1996 results of operations are revenue and operating costs of
$1,998,000 and $845,000, respectively, relating to the Company's U.S. onshore
properties which were sold on December 23, 1996.  During 1996, oil and gas
volumes for such properties were approximately 17,000 barrels and 864,000 MCF,
respectively, net to the Company.

                                       21
<PAGE>
 
  Colombian oil prices averaged $19.82 per barrel during 1996.  The average for
the same period in 1995 was $16.39.  The Company's average U.S. oil price
increased to $20.68 per barrel in 1996, up from $16.78 in 1995.  U.S. gas prices
averaged $2.07 per MCF in 1996 compared to $1.70 in 1995.

  Operating costs decreased $238,000, or 5%, mainly due to cost reductions in
the Colombian operations. Depletion, depreciation and amortization ("DD&A")
increased by 28%, or $1,584,000, primarily due to higher Colombian and U.S. DD&A
rates per barrel and higher Colombian production. U.S. DD&A expenses increased
on a per barrel basis to $5.93 in 1996 from $4.12 in 1995, primarily due to an
increase in costs subject to amortization resulting from development costs
incurred in 1996. Colombian DD&A expenses increased on a per barrel basis to
$11.49 in 1996 from $9.79 in 1995, primarily due to an increase in costs subject
to amortization resulting from development and exploratory costs incurred in
1996 and the transfer of unevaluated costs into the amortization base during
1996.

  General and administrative ("G&A") expense decreased $762,000, or 33%, as a
result of a cost reduction program implemented by the Company during the first
quarter of 1996.  This program has targeted all categories of G&A.

  The Company incurred $196,000 of severance expense during 1996 relating to the
termination of the employment of the Executive Vice President and Chief
Operating Officer of the Company and certain other employees.  For more
information regarding such terminations, see Note 6 of Notes to Consolidated
Financial Statements.

  Interest and other income (expense) increased $566,000 mainly due to a gain of
$641,000 on the sale of the U.S. onshore oil and gas properties on December 23,
1996.

  Interest expense was $256,000 higher, primarily as a result of higher average
balances outstanding in 1996. Debt refinancing expense of $100,000 represents a
fee paid to ING (U.S.) Capital Corporation in consideration for certain
modifications to the Company's credit agreement in March 1996.

  Income taxes were $500,000 higher in 1996 primarily as a result of an increase
in Colombian taxable income and an increase in the valuation allowance for
deferred Colombian tax assets.

1995 versus 1994
- ----------------

<TABLE> 
<CAPTION> 
                                  United States   Colombia
                                   Oil     Gas      Oil     Total
                                 ------  ------   --------  -------
       (Thousands)                              
<S>                              <C>     <C>      <C>       <C>
                                                
       Revenue - 1994            $1,521  $3,621    $3,404   $ 8,546
                                                
       Volume variance              113  (1,118)    2,514     1,509
                                                
       Price variance               147    (375)    1,214       986
                                                
       Other                          -    (113)        -      (113)
                                 ------  ------   --------  -------
       Revenue - 1995            $1,781  $2,015    $7,132   $10,928
                                 ======  ======   ========  =======
</TABLE>

  Colombian oil volumes were 435,000 barrels in 1995, an increase of 185,000
barrels over 1994.  Of such increase, approximately 210,000 barrels resulted
from production from three wells in the Mary field and one well in the Miraflor
field that did not produce during 1994 and one well in the Mary field that
produced during only part of 1994, and approximately 28,000 barrels resulted
from the hydraulic fractionation of the Toroyaco #3 well, offset by a decrease
of approximately 35,000 barrels from the Aporte Putumayo concession and a
decrease of approximately 18,000 barrels from the remaining wells in the
Toroyaco and 

                                       22
<PAGE>
 
Linda fields due to normal production declines. Production from the Aporte
Putumayo concession was shutin effective March 31, 1995, pending abandonment of
the concession.

  U.S. oil volumes were 106,000 barrels in 1995, an increase of 7,000 barrels
from 1994.  This increase resulted primarily from an increase of approximately
13,000 barrels due to the installation of a larger gas lift compressor at Breton
Sound 31, partially offset by a decrease of approximately 5,000 barrels related
to the sale of Ewing Bank 947, effective July 1, 1994.  U.S. gas volumes before
gas balancing adjustments were 1,198,000 MCF in 1995, a decrease of 585,000 MCF
from 1994.  Of such decrease, 217,000 MCF resulted from the sale of Ewing Bank
947 and 128,000 MCF resulted from decreased production from Main Pass 41 that
was primarily due to the loss of one well, which ceased production in July 1994.
The remaining decrease in gas volumes was primarily due to normal production
declines.

  Colombian oil prices averaged $16.39 per barrel during 1995.  The average
price for the same period in 1994 was $13.60 per barrel.  1994 oil sales were
subject to a sales contract with Ecopetrol, and the sales were based on a
"netback" price as specified in the sales contract.  During 1995 a new sales
contract with Ecopetrol was in effect pursuant to which the crude was either
exported or sold to a Colombian refinery.  In 1995, the crude was generally
exported and prices were higher due to a general increase in world oil prices.

  In addition to the above-mentioned variances, U.S. gas revenue decreased
approximately $113,000 as a result of gas balancing adjustments.

  Operating costs increased by $552,000, or 12%, due primarily to an increase in
Colombian production expense associated with the Mary and Miraflor fields.  Such
fields had minimal production during 1994.

  DD&A increased $1.8 million, or 44%, primarily due to higher Colombian volumes
and to a higher Colombian DD&A rate per barrel.  Colombian DD&A expenses
increased on a per barrel basis to $9.79 in 1995 from $7.90 in 1994, as a result
of a downward revision in Colombian reserve volumes and an increase in costs
subject to amortization.

  G&A expense increased $233,000 due primarily to an increase in public
ownership costs of $221,000 principally associated with being listed on the
American Stock Exchange during 1995. In addition, $125,000 of fees were paid to
an investment banking firm during 1995 to investigate and evaluate existing
alternatives to enhance shareholder value. These costs were partially offset by
a decrease in legal fees of $145,000.

  Interest and other income (expense) during 1995 increased primarily due to a
$167,000 increase in foreign exchange gains from 1994 to 1995 and the absence in
1995 of a $156,000 charge incurred in 1994 relating to the settlement of
litigation regarding the validity of a lease for vacated office space in London.

  Interest expense was $283,000 higher, primarily as a result of higher average
balances outstanding.

  Income taxes increased $125,000 primarily due to the threshold for "commercial
income" being reached in Colombia during 1995 resulting in the 12% remittance
tax thereon.  In 1994 the Company did not achieve commercial income in Colombia.

Liquidity and Capital Resources

  During the period 1994 through 1996, costs incurred in oil and gas property
acquisition, exploration and development activities by the Company totaled
approximately $23.6 million.  Of this figure, approximately $23.5 million was
for exploration and development costs and $0.1 million pertained to acquisitions
of proved properties in the United States.  Approximately 83% of the exploration
and development expenditures were incurred in Colombia, while the remainder was
primarily development costs incurred in the United States.  The Company's
sources of funds during this period were: (i) cash 

                                       23
<PAGE>
 
provided by operating activities - 1996 - $8.9 million; 1995 - $2.9 million; and
1994 - $3.1 million; (ii) net cash provided by investing activities (before
property and equipment expenditures) - 1996 - $2.7 million; 1995 - $0.1 million;
and 1994 - $2.5 million; and (iii) net cash provided by (used in) financing
activities - 1996 - $(5.1) million; 1995 - $6.4 million; and 1994 - $1.2
million.

  The Company is engaged in the drilling of certain development wells and the
recompletion of certain existing wells in Colombia.  See "Item 2. Properties --
Significant Properties."  The Company's share of the estimated future costs of
these development activities is approximately $2.9 million at December 31, 1996.
In addition, the Company is currently completing a 3-D seismic program on the
Santana concession and a 2-D seismic program on the Yuruyaco concession.  The
Company's estimated share of these future seismic and certain other
miscellaneous costs is approximately $1.0 million.  Failure to fund certain
capital expenditures could result in the forfeiture of all or part of the
Company's interest in the concessions.

  The aggregate remaining estimated exploratory and development expenditures for
1997 and 1998 were $3.9 million at December 31, 1996.  The Company plans to fund
these obligations through cash provided from operations.  Any substantial
decreases in the borrowing base as hereinafter defined or increases in the
amounts of these required expenditures could adversely affect the Company's
ability to meet the obligations.  Delays in obtaining the required environmental
approvals and permits on a timely basis, as described above under "Item 1.
Business -- Regulation," and construction delays could both, through the impact
of inflation, increase the required expenditures.  Cost overruns resulting from
factors other than inflation could also increase the required expenditures.
Historically, the inflation rate of the Colombian peso has been in the range of
20-30% per year.  Devaluation of the peso against the U.S. dollar has
historically been slightly less than the inflation rate in Colombia.  The
Company has historically funded capital expenditures in Colombia by converting
U.S. dollars to pesos at such time as the expenditures have been made.  As a
result of the interaction between peso inflation and devaluation of the peso
against the U.S. dollar, inflation, from the Company's perspective, had not been
a significant factor.  During 1994, the first half of 1995 and 1996, however,
devaluation of the peso was substantially lower than the rate of inflation of
the peso, resulting in an effective inflation rate in excess of that of the U.S.
dollar.  There can be no assurance that this trend will not continue or that, in
such event, there will not be substantial increases in future capital
expenditures as a result.  Due to Colombian exchange controls and restrictions
and the lack of an effective market, it is not feasible to hedge against the
risk of net peso inflation against the U.S. dollar and the Company has not done
so.  Depending on the results of the exploration and development activities,
substantial expenditures which have not been included in the Company's cash flow
projections may be required.  Although the ultimate outcome of these matters
cannot be projected with certainty, management believes that its existing
capital resources are adequate to fund its present obligations or that
sufficient capital can be obtained by means of sales of assets or revision of
current debt repayment terms to meet those obligations.

  The Company is a party to a credit agreement with ING (U.S.) Capital
Corporation ("ING Capital") pursuant to which the borrower thereunder may borrow
up to $25 million, subject to a borrowing base the determination of which is
predicated on the Company's U.S. and Colombian reserves and which is
redetermined annually.  As of December 31, 1996, the borrowing base permitted,
and the outstanding loan balance was, $7,990,000.  Borrowings under the credit
agreement bear interest at the prime commercial rate of the lender in effect
from time to time for its most creditworthy customers plus 1% per annum or, at
the Company's option, a fixed rate based on the London Interbank Offered Rate
for a portion or portions of the outstanding indebtedness.  The borrower under
the credit agreement is Neo Energy, Inc., a wholly owned subsidiary of the
Company and the owner of the Company's interests in the Colombian concessions.
The indebtedness under the credit agreement is guaranteed by the parent company
and certain other subsidiaries, including the wholly owned subsidiary that is
the owner of all the Company's domestic oil and gas properties.  The loan
prohibits the payment of dividends by the Company and requires the maintenance
of certain financial ratios. In December 1996, the Company entered into an
agreement with ING Capital pursuant to which the outstanding loan balance was
paid down to $7,990,000 from 

                                       24
<PAGE>
 
$10,790,000 and the repayment schedule was amended to require monthly payments
of $25,000 for the first seven months of 1997 and $521,000 for the last five
months of 1997 and the first ten months of 1998.

  The Company's internal projections of its consolidated cash flow through
December 31, 1998 indicate that the Company's consolidated cash flow and working
capital will be adequate to fund both the estimated exploratory and development
expenditures for 1997 and 1998 and the debt service relating to the ING Capital
credit agreement as rescheduled through October 1998.  These internal cash flow
projections assume (i) crude oil sales prices of $20.66 per barrel for Colombian
production and $21.52 per barrel for United States production and natural gas
sales prices of $2.10 per MCF for United States production, (ii) successful
completion of three development wells on the Santana Concession in Colombia,
(iii) production decline curves commensurate with those assumed by the Company's
independent petroleum engineers, (iv) certain reductions in general and
administrative costs and (v) interest rates and operating costs at current
levels.  Any significant inaccuracy in any of these assumptions, as well as
interruptions of production, increases in required expenditures as a result of
inflation or cost overruns or delays in the Company's development program, may
adversely affect the Company's ability to fund such exploratory and development
expenditures or to meet its existing debt service obligations.  Depending on the
results of the Company's exploration and development activities, substantial
expenditures that have not been included in such cash flow projections may be
required.  For information regarding the risks relating to the Company's
business, see "Item 1. Business -- Risks Associated with the Company's
Business".

  During late 1995, the Company engaged in discussions with Garnet Resources
Corporation, the parent of the co-owner of the Company's Colombian concessions,
regarding a possible merger of the Company and Garnet Resources Corporation.  In
December 1995, these discussions were terminated as a result of the inability of
the parties to reach agreement on terms and conditions of the proposed merger.
At that time, the Board of Directors of the Company empowered a committee of
directors to investigate and evaluate other strategic alternatives for the
Company.  That committee was dissolved on July 25, 1996 and its function was
assumed by the entire Board of Directors.

  With the exception of historical information, the matters discussed in this
annual report to shareholders contain forward-looking statements that involve
risks and uncertainties.  Although the Company believes that its expectations
are based on reasonable assumptions, it can give no assurance that its goals
will be achieved.  Important factors that could cause actual results to differ
materially from those in the forward-looking statements herein include the
timing and extent of changes in commodity prices for oil and gas, the extent of
the Company's success in discovering, developing and producing reserves,
political conditions in Colombia and conditions of the capital markets and
equity markets during the periods covered by the forward-looking statements, as
well as other factors described in "Item 1. Business - Risks Associated with the
Company's Business."

                                       25
<PAGE>
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA


  See the Financial Statements of Aviva Petroleum Inc. attached hereto and
listed in Item 14 herein.



ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE.


  None.

                                       26
<PAGE>
 
                                   PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT


  The information required with respect to directors is set forth under the
caption "Election of Directors" and "Beneficial Ownership of Securities" in the
Company's definitive Proxy Statement to be filed pursuant to Regulation 14A and
is incorporated herein by reference.



ITEM 11. EXECUTIVE COMPENSATION


  The information required is set forth under the caption "Executive
Compensation" in the Company's definitive Proxy Statement to be filed pursuant
to Regulation 14A and is incorporated herein by reference.



ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT


  The information required is set forth under the caption "Beneficial Ownership
of Securities" in the Company's definitive Proxy Statement to be filed pursuant
to Regulation 14A and is incorporated herein by reference.



ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS


  The information required is set forth under the caption "Certain Relationships
and Related Transactions" in the Company's definitive Proxy Statement to be
filed pursuant to Regulation 14A and is incorporated herein by reference.

                                       27
<PAGE>
 
                                    PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K


a.   The following documents are filed as part of this report:
 
     (1)  Financial Statements: The Financial Statements of Aviva Petroleum Inc.
          filed as part of this report are listed in the "Index to Financial
          Statements" included elsewhere herein.
     (2)  Financial Statement Schedules:  All schedules called for under
          Regulation S-X have been omitted because they are not applicable, the
          required information is not material or the required information is
          included in the consolidated financial statements or notes thereto.

     (3)  Exhibits:

          *3.1  Restated Articles of Incorporation of the Company dated July 25,
                1995 (filed as exhibit 3.1 to the Company's annual report on
                Form 10-K for the year ended December 31, 1995, File No. 0-
                22258, and incorporated herein by reference).

          *3.2  Amended and Restated Bylaws of the Company, as amended as of
                January 23, 1995 (filed as exhibit 3.2 to the Company's annual
                report on Form 10-K for the year ended December 31, 1994, File
                No. 0-22258, and incorporated herein by reference).

          *10.1 Risk Sharing Contract between Empresa Colombiana de Petroleos
                ("Ecopetrol"), Argosy Energy International ("Argosy") and Neo
                Energy, Inc. ("Neo") (filed as exhibit 10.1 to the Company's
                Registration Statement on Form10, File No. 0-22258, and
                incorporated herein by reference).

          *10.2 Contract for Exploration and Exploitation of Sector Number 1
                of the Aporte Putumayo Area ("Putumayo") between Ecopetrol and
                Cayman Corporation of Colombia dated July 24, 1972 (filed as
                exhibit 10.2 to the Company's Registration Statement on Form10,
                File No. 0-22258, and incorporated herein by reference).

          *10.3 Operating Agreement for Putumayo between Argosy and Neo dated
                September 16, 1987 and amended on January 4, 1989 and February
                23, 1990 (filed as exhibit 10.3 to the Company's Registration
                Statement on Form10, File No. 0-22258, and incorporated herein
                by reference).

          *10.4 Operating Agreement for the Santana Area ("Santana") between
                Argosy and Neo dated September 16, 1987 and amended on January
                4, 1989, February 23, 1990 and September 28, 1992 (filed as
                exhibit 10.4 to the Company's Registration Statement on Form10,
                File No. 0-22258, and incorporated  herein by reference).

          *10.5 Agreement of Withdrawal from Argosy dated September 16, 1987
                by and among Argosy, Neo, and Argosy Energy Incorporated, as
                general partners; and Parkside Investments, Richard Shaner
                McKnight, Douglas W. Fry, P-5 Ltd., GO-DEO, Inc., Dale E.
                Armstrong, Richard Shane McKnight, The Yvonne McKnight Trust,
                and William Gaskin, as limited partners (filed as exhibit 10.5
                to the Company's Registration Statement on Form10, File No. 0-
                22258, and incorporated herein by reference).

          *10.6 Option Agreement dated September 16, 1987 between the general
                and limited partners of Argosy and Neo (filed as exhibit 10.6 to
                the Company's Registration Statement on Form10, File No. 0-
                22258, and incorporated herein by reference).

          *10.7 Escrow Agreement between Argosy, Neo, Overseas Private
                Investment Corporation and The Chase Manhattan Bank dated March
                15, 1988 and amended on May 31, 1990 (filed as exhibit 10.7 to
                the Company's Registration Statement on Form10, File No. 0-
                22258, and incorporated herein by reference).

          *10.8 Santana Block A Relinquishment dated March 6, 1990 between
                Ecopetrol, Argosy and Neo (filed as exhibit 10.8 to the
                Company's Registration Statement on Form10, File No. 0-22258,
                and incorporated herein by reference).

                                       28
<PAGE>
 
          *10.9  Purchase Sale - Transportation and Commercialization of the
                 Santana Crude between Ecopetrol, Argosy and Neo (filed as
                 exhibit 10.9 to the Company's Registration Statement on Form
                 10, File No. 0-22258, and incorporated herein by reference).

          *10.10 La Fragua Association Contract dated June 1, 1992 between
                 Ecopetrol, Argosy and Neo (filed as exhibit 10.10 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.11 Operating Agreement for the La Fragua Area between Argosy
                 and Neo dated April 15, 1992 (filed as exhibit 10.11 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.12 Employment Agreement between the Company and Ronald Suttill
                 dated November 29, 1991 (filed as exhibit 10.12 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.13 Employee Stock Option Plan of the Company (filed as exhibit
                 10.13 to the Company's Registration Statement on Form 10, File
                 No. 0-22258, and incorporated herein by reference).
 
          *10.14 Letter agreement dated January 6, 1993 between NationsBank
                 Investment Banking and the Company (filed as exhibit 10.14 to
                 the Company's Registration Statement on Form 10, File No. 0-
                 22258, and incorporated herein by reference).

          *10.15 Letter agreement dated March 3, 1993 between EnCap
                 Investments L.C. and the Company (filed as exhibit 10.15 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.16 Credit Agreement dated August 6, 1993 between the Company,
                 Aviva America, Inc. ("Aviva America"), Neo and Internationale
                 Nederlanden Bank N.V., New York Branch ("ING Capital") (filed
                 as exhibit 10.16 to the Company's Registration Statement on
                 Form 10, File No. 0-22258, and incorporated herein by
                 reference).

          *10.17 Subordination Agreement dated August 6, 1993 between the
                 Company, Aviva America, Aviva Operating Company ("Aviva
                 Operating"), Neo and ING Capital (filed as exhibit 10.17 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.18 Stock Pledge Agreement dated August 6, 1993 between the Company
                 and ING Capital (filed as exhibit 10.18 to the Company's
                 Registration Statement on Form 10, File No. 0-22258, and
                 incorporated herein by reference).

          *10.19 Stock Pledge Agreement dated August 6, 1993 between Aviva
                 America and ING Capital (filed as exhibit 10.19 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

          *10.20 Guaranty dated August 6, 1993 made by the Company in favor of
                 ING Capital (filed as exhibit 10.20 to the Company's
                 Registration Statement on Form 10, File No. 0-22258, and
                 incorporated herein by reference).

          *10.21 Guaranty dated August 6, 1993 made by Aviva America in favor of
                 ING Capital (filed as exhibit 10.21 to the Company's
                 Registration Statement on Form 10, File No. 0-22258, and
                 incorporated herein by reference).

          *10.22 Guaranty dated August 6, 1993 made by Aviva Operating in favor
                 of ING Capital (filed as exhibit 10.22 to the Company's
                 Registration Statement on Form 10, File No. 0-22258, and
                 incorporated herein by reference).

          *10.23 Form of Subscription Agreement dated June 18, 1993 between the
                 Company and purchasers of 12,884,207 shares of common stock
                 ("Purchasers") (filed as exhibit 10.23 to the Company's
                 Registration Statement on Form 10, File No. 0-22258, and
                 incorporated herein by reference).

          *10.24 Option Agreement between RBS and Aviva Energy Inc. ("Aviva
                 Energy") dated July 1, 1993 (filed as exhibit 10.24 to the
                 Company's Registration Statement on Form 10, File No. 0-22258,
                 and incorporated herein by reference).

                                       29
<PAGE>
 
            *10.25  Option Agreement between Aviva Energy and Purchasers dated
                    July 1, 1993 (filed as exhibit 10.25 to the Company's
                    Registration Statement on Form 10, File No. 0-22258, and
                    incorporated herein by reference).

            *10.26  Santana Block B 50% relinquishment dated September 13, 1993
                    between Ecopetrol, Argosy and Neo (filed as exhibit 10.26 to
                    the Company's annual report on Form 10-K for the year ended
                    December 31, 1993, File No. 0-22258, and incorporated herein
                    by reference).

            *10.27  Amendment to La Fragua Association contract dated December
                    2, 1993 between Ecopetrol, Argosy and Neo (filed as exhibit
                    10.27 to the Company's annual report on Form 10-K for the
                    year ended December 31, 1993, File No. 0-22258, and
                    incorporated herein by reference).

            *10.28  Letter from Ecopetrol dated February 24, 1994 and Resolution
                    dated February 18, 1994 revising pipeline tariff (filed as
                    exhibit 10.28 to the Company's annual report on Form 10-K
                    for the year ended December 31, 1993, File No. 0-22258, and
                    incorporated herein by reference).

            *10.29  Aviva Petroleum Inc. 401(k) Retirement Plan effective March
                    1, 1992 (filed as exhibit 10.29 to the Company's annual
                    report on Form 10-K for the year ended December 31, 1993,
                    File No. 0-22258, and incorporated herein by reference).

            *10.30  Relinquishment of Putumayo dated December 1, 1993 (filed as
                    exhibit 10.30 to the Company's annual report on Form 10-K
                    for the year ended December 31, 1993, File No. 0-22258, and
                    incorporated herein by reference).

            *10.31  Amendment to ING Capital agreement dated March 28, 1994
                    (filed as exhibit 10.31 to the Company's annual report on
                    Form 10-K for the year ended December 31, 1993, File No. 0-
                    22258, and incorporated herein by reference).

            *10.32  Deposit Agreement dated September 15, 1994 between the
                    Company and Chemical Shareholder Services Group, Inc. (filed
                    as exhibit 10.29 to the Company's Registration Statement on
                    Form S-1, File No. 33-82072, and incorporated herein by
                    reference).

            *10.33  Form of Registration Agreement dated as of September 15,
                    1994 between the Company and Shearson Lehman Brothers Inc.
                    (filed as exhibit 10.30 to the Company's Registration
                    Statement on Form S-1, File No. 33-82072, and incorporated
                    herein by reference).

            *10.34  Form of Registration Agreement and Limited Power of Attorney
                    dated as of September 15, 1994 between the Company and all
                    other Selling Shareholders (filed as exhibit 10.31 to the
                    Company's Registration Statement on Form S-1, File No. 33-
                    82072, and incorporated herein by reference).

            *10.35  Form of Broker-Dealer Agreement dated as of October 19, 1994
                    between the Company and Petrie Parkman & Co. (filed as
                    exhibit 10.32 to the Company's Registration Statement on
                    Form S-1, File No. 33-82072, and incorporated herein by
                    reference).

            *10.36  Purchase and Sale Agreement dated July 22, 1994 by and
                    between Newfield Exploration Company and Aviva America
                    (filed as exhibit 10.33 to the Company's Registration
                    Statement on Form S-1, File No. 33-82072, and incorporated
                    herein by reference).

            *10.37  Letter from ING Capital dated October 27, 1994, amending
                    Section 5.2(n) of the Credit Agreement (filed as exhibit
                    10.37 to the Company's annual report on Form 10-K for the
                    year ended December 31, 1994, File No. 0-22258, and
                    incorporated herein by reference).

            *10.38  Letter from Ecopetrol dated December 28, 1994, accepting
                    relinquishment of Putumayo (filed as exhibit 10.38 to the
                    Company's annual report on Form 10-K for the year ended
                    December 31, 1994, File No. 0-22258, and incorporated herein
                    by reference).

                                       30
<PAGE>
 
        *10.39  Letter from Ecopetrol dated February 28, 1995, accepting
                modifications to the La Fragua Association Contract (filed
                as exhibit 10.39 to the Company's annual report on Form 10-K
                for the year ended December 31, 1994, File No. 0-22258, and
                incorporated herein by reference).

        *10.40  Amendment to ING Capital Credit Agreement dated March 7, 1995
                (filed as exhibit 10.40 to the Company's annual report on Form
                10-K for the year ended December 31, 1994, File No. 0-22258, and
                incorporated herein by reference).

        *10.41  Santana Crude Oil Sale Contract dated March 19, 1995 (filed
                as exhibit 10.41 to the Company's annual report on Form 10-K for
                the year ended December 31, 1994, File No. 0-22258, and
                incorporated herein by reference).

        *10.42  Employment Agreement between the Company and Ronald Suttill
                effective January 1, 1995 (filed as exhibit 10.1 to the
                Company's quarterly report on Form 10-Q for the quarter ended
                March 31, 1995, File No. 0-22258, and incorporated herein by
                reference).

        *10.43  Employment Agreement between the Company and Robert C. Boyd
                effective January 1, 1995 (filed as exhibit 10.2 to the
                Company's quarterly report on Form 10-Q for the quarter ended
                March 31, 1995, File No. 0-22258, and incorporated herein by
                reference).

        *10.44  Amendment to ING Capital Credit Agreement dated June 9, 1995
                (filed as exhibit 10.3 to the Company's quarterly report on Form
                10-Q for the quarter ended June 30, 1995, File No. 0-22258, and
                incorporated herein by reference).

        *10.45  Amendment to the Incentive and Nonstatutory Stock Option
                Plan of the Company (filed as exhibit 10.4 to the Company's
                quarterly report on Form 10-Q for the quarter ended September
                30, 1995, File No. 0-22258, and incorporated herein by
                reference).

        *10.46  Aviva Petroleum Inc. 1995 Stock Option Plan (filed as
                exhibit 10.5 to the Company's quarterly report on Form 10-Q for
                the quarter ended September 30, 1995, File No. 0-22258, and
                incorporated herein by reference).

        *10.47  Yuruyaco Association Contract dated September 20, 1995
                between Ecopetrol, Argosy and Neo (filed as exhibit 10.6 to the
                Company's quarterly report on Form 10-Q for the quarter ended
                September 30, 1995, File No. 0-22258, and incorporated herein by
                reference).

        *10.48  Letter from ING Capital dated November 3, 1995, amending
                Section 5.2 (n) of the Credit Agreement (filed as exhibit 10.7
                to the Company's quarterly report on Form 10-Q for the quarter
                ended September 30, 1995, File No. 0-22258, and incorporated
                herein by reference).

        *10.49  Amendment to the Santana Crude Oil Sale Contract (filed as
                exhibit 10.49 to the Company's annual report on Form 10-K for
                the year ended December 31, 1995, File No. 0-22258, and
                incorporated herein by reference).

        *10.50  Amendment to the La Fragua Association Contract dated April
                27, 1995 (filed as exhibit 10.50 to the Company's annual report
                on Form 10-K for the year ended December 31, 1995, File No. 0-
                22258, and incorporated herein by reference).

        *10.51  Santana Block B 25% relinquishment dated October 2, 1995
                (filed as exhibit 10.51 to the Company's annual report on Form
                10-K for the year ended December 31, 1995, File No. 0-22258, and
                incorporated herein by reference).

        *10.52  Amendment to the La Fragua Association Contract dated August
                1, 1995 (filed as exhibit 10.52 to the Company's annual report
                on Form 10-K for the year ended December 31, 1995, File No. 0-
                22258, and incorporated herein by reference)

        *10.53  Operating Agreement for the Yuruyaco Area between Argosy and
                Neo dated November 7, 1995 (filed as exhibit 10.53 to the
                Company's annual report on Form 10-K for the year ended December
                31, 1995, File No. 0-22258, and incorporated herein by
                reference).

                                       31
<PAGE>
 
        *10.54  Letter from ING Capital dated March 19, 1996, amending the
                borrowing base, schedule of principal repayments and Section 5.2
                (m) of the Credit Agreement (filed as exhibit 10.54 to the
                Company's annual report on Form 10-K for the year ended December
                31, 1995, File No. 0-22258, and incorporated herein by
                reference).

        *10.55  Amendment to the ING Capital Credit Agreement dated March
                29, 1996 (filed as exhibit 10.1 to the Company's quarterly
                report on Form 10-Q for the quarter ended March 31, 1996, File
                No. 0-22258, and incorporated herein by reference).

        *10.56  Aviva Petroleum Inc. Severance Benefit Plan (filed as
                exhibit 10.2 to the Company's quarterly report on Form 10-Q for
                the quarter ended March 31, 1996, File No. 0-22258, and
                incorporated herein by reference).

       **10.57  Amendment to the ING Capital Credit Agreement dated
                November 22, 1996.
  
       **10.58  Purchase and Sale Agreement dated November 22, 1996 between
                BWAB Incorporated and Aviva America.
 
       **10.59  Purchase and Sale Agreement dated December 6, 1996 between
                Lomak Petroleum Inc. and Aviva America.
 
       **10.60  Santana Crude Sale and Purchase Agreement dated February
                10, 1997.

        *21.1   List of subsidiaries of Aviva Petroleum Inc.
 
       **27.1   Financial Data Schedule

       ---------------------
 
       *        Previously Filed
       **       Filed Herewith

                                       32
<PAGE>
 
b. Reports on Form 8-K
   -------------------

   The Company filed the following Current Reports on Form 8-K during and
   subsequent to the end of the fourth quarter:

   Date of 8-K                Description of 8-K
   -----------                ------------------

   October 2, 1996            Submitted a copy of the Company's Press Release
                              dated October 2, 1996 reporting on the Company's
                              progress on U.S. operations.

   November 12, 1996          Submitted a copy of the Company's Press Release
                              dated November 12, 1996 announcing production
                              increases in the Gulf of Mexico.

   November 20, 1996          Submitted a copy of the Company's Press Release
                              dated November 20, 1996 reporting industry
                              discussions on Breton Sound in the Gulf of Mexico.

   November 26, 1996          Submitted a copy of the Company's Press release
                              dated November 26, 1996 reporting agreement to
                              sell U.S. onshore properties.

   December 3, 1996           Submitted a copy of the Company's Press release
                              dated December 3, 1996 reporting on the Company's
                              Colombian development program.

   January 7, 1997            Submitted a copy of the Company's Press release
                              dated January 7, 1997 reporting on the closing of
                              the U.S. onshore properties sale.

   January 8, 1997            Submitted a copy of the Company's Press release
                              dated January 8, 1997 reporting on the Company's
                              Colombian exploration and development operations.

 

                                       33
<PAGE>
 
                                  SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized.
 
                                       AVIVA PETROLEUM INC.

 
                                       By:  /s/ Ronald Suttill
                                            ------------------------------------
                                            Ronald Suttill
                                            Chief Executive Officer and Director

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the registrant and
in the capacities and on the dates indicated.

SIGNATURE                       TITLE                                 DATE

/s/ Ronald Suttill          President, Chief Executive Officer    March 17, 1997
- --------------------------  and Director (principal executive     --------------
Ronald Suttill              officer) 


/s/ James L. Busby          Treasurer and Secretary               March 17, 1997
- --------------------------  (principal financial and accounting   --------------
James L. Busby              officer)


/s/ John J. Lee             Director                              March 13, 1997
- --------------------------                                        --------------
John J. Lee


/s/ Elliott Roosevelt, Jr.  Director                              March 17, 1997
- --------------------------                                        --------------
Elliott Roosevelt, Jr.


/s/ James E. Tracey         Director                              March 17, 1997
- --------------------------                                        --------------
James E. Tracey

                                       34
<PAGE>
 
        INDEX TO FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES
 
                                                                Page
                                                                ----
 
Independent Auditors' Report..................................    36
 
Consolidated Balance Sheet as of December 31, 1996 and 1995...    37
 
Consolidated Statement of Operations for the years
     ended December 31, 1996, 1995 and 1994...................    38
 
Consolidated Statement of Cash Flows for the years
     ended December 31, 1996, 1995 and 1994...................    39
 
Consolidated Statement of Stockholders' Equity for the years
     ended December 31, 1996, 1995 and 1994...................    40
 
Notes to Consolidated Financial Statements....................    41
 
Supplementary Information Related to Oil and Gas Producing
     Activities (Unaudited)...................................    54
 

All schedules called for under Regulation S-X have been omitted because they are
not applicable, the required information is not material or the required
information is included in the consolidated financial statements or notes
thereto.

                                       35
<PAGE>
 
                          INDEPENDENT AUDITORS' REPORT
                          ----------------------------

The Board of Directors
Aviva Petroleum Inc.:

We have audited the accompanying consolidated balance sheet of Aviva Petroleum
Inc. and subsidiaries as of December 31, 1996 and 1995 and the related
consolidated statements of operations, stockholders' equity and cash flows for
each of the years in the three-year period ended December 31, 1996. These
consolidated financial statements are the responsibility of the Company's
management.  Our responsibility is to express an opinion on these consolidated
financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present
fairly, in all material respects, the financial position of Aviva Petroleum Inc.
and subsidiaries as of December 31, 1996 and 1995, and the results of their
operations and their cash flows for each of the years in the three-year period
ended December 31, 1996, in conformity with generally accepted accounting
principles.





                                         /s/ KPMG Peat Marwick LLP



Dallas, Texas
February 28, 1997

                                       36
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
                           DECEMBER 31, 1996 AND 1995
                    (in thousands, except number of shares)

<TABLE>
<CAPTION>
                                                            1996       1995
                                                          ---------  ---------
<S>                                                       <C>        <C>
ASSETS                                                    
                                                          
Current assets:                                           
 Cash and cash equivalents                                $  2,041   $  4,200
 Accounts and notes receivable (notes 2 and 8):           
   Oil and gas revenue                                       1,699      1,881
   Trade                                                     1,674        388
   Other                                                       377        487
 Inventories                                                   721        809
 Prepaid expenses and other                                    282        667
                                                          --------   --------
                                                          
   Total current assets                                      6,794      8,432
                                                          --------   --------
                                                          
Property and equipment, at cost (note 3):                 
 Oil and gas properties and equipment (full cost method)    58,324     80,544
 Other                                                         613        626
                                                          --------   --------
                                                            58,937     81,170
 Less accumulated depreciation, depletion                 
   and amortization                                        (23,991)   (45,663)
                                                          --------   --------
                                                            34,946     35,507
Other assets (note 2)                                        1,204      1,521
                                                          --------   --------
                                                          
                                                          $ 42,944   $ 45,460
                                                          ========   ========
                                                          
LIABILITIES AND STOCKHOLDERS' EQUITY                      
                                                          
Current liabilities:                                      
 Current portion of long term debt (note 3)               $  2,780   $  2,397
 Accounts payable                                            6,271      2,783
 Accrued liabilities                                           357        217
                                                          --------   --------
   Total current liabilities                                 9,408      5,397
                                                          --------   --------
                                                          
Long term debt, excluding current portion (note 3)           5,210     10,670
Gas balancing obligations and other (note 10)                1,404      1,729
Deferred foreign income taxes (note 7)                         692        497
Stockholders' equity (notes 3 and 5):                     
 Common stock, no par value, authorized 348,500,000       
   shares; issued 31,482,716 shares                          1,574      1,574
 Additional paid-in capital                                 33,376     33,376
 Accumulated deficit*                                       (8,720)    (7,783)
                                                          --------   --------
                                                          
   Total stockholders' equity                               26,230     27,167
                                                          
Commitments and contingencies (note 9)                    
                                                          --------   --------
                                                          $ 42,944   $ 45,460
                                                          ========   ========
</TABLE>
*Accumulated deficit of $70,057 was eliminated at December 31, 1992 in
 connection with a quasi-reorganization. See note 5.

See accompanying notes to consolidated financial statements.

                                       37
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF OPERATIONS
                  YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
                     (in thousands, except per share data)
<TABLE>
<CAPTION>
 
                                                 1996      1995      1994
                                               --------  --------  --------
<S>                                            <C>       <C>       <C>
                                               
Oil and gas sales (note 8)                     $13,750   $10,928   $ 8,546
                                               -------   -------   -------
                                               
Expense:                                       
 Production                                      4,834     5,072     4,520
 Depreciation, depletion and amortization        7,339     5,755     3,984
 General and administrative                      1,554     2,316     2,083
 Severance (note 6)                                196         -         -
                                               -------   -------   -------
                                               
   Total expense                                13,923    13,143    10,587
                                               -------   -------   -------
                                               
Other income (expense):                        
 Interest and other income (expense),          
   net (note 4)                                  1,061       495       142
 Interest expense                                 (814)     (558)     (275)
 Debt refinancing expense (note 3)                (100)        -         -
                                               -------   -------   -------
                                               
   Total other income (expense)                    147       (63)     (133)
                                               -------   -------   -------
                                               
   Loss before income taxes                        (26)   (2,278)   (2,174)
Income taxes (note 7)                             (911)     (411)     (286)
                                               -------   -------   -------
                                               
   Net loss                                    $  (937)  $(2,689)  $(2,460)
                                               =======   =======   =======

Weighted average common shares outstanding      31,483    31,483    31,483
                                               =======   =======   =======
                                               
                                               
Net loss per common share                      $ (0.03)  $ (0.09)  $ (0.08)
                                               =======   =======   =======
</TABLE>                                       
See accompanying notes to consolidated financial statements.

                                       38
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                  YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
                                 (in thousands)
<TABLE>
<CAPTION>
                                                      1996      1995     1994
                                                     -------   -------  -------
<S>                                                  <C>       <C>      <C>
Net loss                                             $  (937)  $(2,689) $(2,460)
Adjustments to reconcile net loss to
 net cash provided by operating activities:
  Depreciation, depletion and amortization             7,339     5,755    3,984
  Deferred foreign income taxes                          195        (5)      37
  Loss (gain) on sale of assets, net                    (651)        2        -
  Foreign currency exchange loss (gain), net              16      (164)       3
  Other                                                 (253)     (168)     (57)
  Changes in assets and liabilities:
   Accounts and notes receivable                        (916)      767    2,843
   Inventories                                            88       212      231
   Prepaid expenses and other                            406        (6)    (291)
   Accounts payable and accrued liabilities            3,656      (843)  (1,230)
                                                     -------   -------  -------
 
     Net cash provided by operating activities         8,943     2,861    3,060
                                                     -------   -------  -------
 
Cash flows from investing activities:
 Property and equipment expenditures                  (8,667)   (7,457)  (7,503)
 Proceeds from sale of assets                          2,729        73    2,198
 Other                                                   (46)        -      313
                                                     -------   -------  -------
 
     Net cash used in investing activities            (5,984)   (7,384)  (4,992)
                                                     -------   -------  -------
Cash flows from financing activities:
 Proceeds from long term debt                              -     7,100    4,801
 Principal payments on long term debt                 (5,077)     (673)  (3,637)
                                                     -------   -------  -------
      Net cash provided by (used in) financing
       activities                                     (5,077)    6,427    1,164
                                                     -------   -------  -------
 
Effect of exchange rate changes on cash and
 cash equivalents                                        (41)      314       (4)
                                                     -------   -------  -------
 
Net increase (decrease) in cash and cash 
  equivalents                                         (2,159)    2,218     (772)
Cash and cash equivalents at beginning of year         4,200     1,982    2,754
                                                     -------   -------  -------

Cash and cash equivalents at end of year             $ 2,041   $ 4,200  $ 1,982
                                                     =======   =======  =======
</TABLE>
See accompanying notes to consolidated financial statements.

                                       39
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
                 CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                  YEARS ENDED DECEMBER 31, 1996, 1995 AND 1994
                    (in thousands, except number of shares)
<TABLE>
<CAPTION>
                         Common Stock      
                      ------------------  Additional                 Total
                      Number of             Paid-in   Accumulated  Stockholders'
                        Shares     Amount   Capital     Deficit      Equity
                      ----------  ------- ----------- ----------- -------------
<S>                   <C>         <C>     <C>         <C>         <C>
Balances at
 December 31,1993     31,482,716   $1,574   $33,376     $(2,634)     $32,316
 
Net loss                       -        -         -      (2,460)      (2,460)
                      ----------   ------   -------     -------      -------
 
Balances at
 December 31, 1994    31,482,716    1,574    33,376      (5,094)      29,856
 
Net loss                       -        -         -      (2,689)      (2,689)
                      ----------   ------   -------     -------      -------
 
Balances at
 December 31, 1995    31,482,716    1,574    33,376      (7,783)      27,167
 
Net loss                       -        -         -        (937)        (937)
                      ----------   ------   -------     -------      -------
 
Balances at
 December 31, 1996    31,482,716   $1,574   $33,376     $(8,720)     $26,230
                      ==========   ======   =======     =======      =======
</TABLE>
See accompanying notes to consolidated financial statements.

                                       40
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     General
     Aviva Petroleum Inc. and its subsidiaries (the "Company") are engaged in
     the business of exploring for, developing and producing oil and gas in
     Colombia and in the United States.  The Company's Colombian oil production
     is sold to Empresa Colombiana de Petroleos, the Colombian national oil
     company ("Ecopetrol"), while the Company's U.S. oil and gas production is
     sold to numerous U.S. purchasers. (See notes 8 and 11.)

     Oil and gas are the Company's only products and there is substantial
     uncertainty as to the prices that the Company may receive for its
     production.  A decrease in these prices would affect operating results
     adversely.

     Principles of Consolidation
     The consolidated financial statements include the accounts of Aviva
     Petroleum Inc. and its subsidiaries. All significant intercompany accounts
     and transactions have been eliminated in consolidation.

     Inventories
     Inventories consist primarily of tubular goods, oilfield equipment and
     spares and are stated at the lower of average cost or market.

     Property and Equipment
     Under the full cost method of accounting for oil and gas properties, all
     productive and nonproductive property acquisition, exploration and
     development costs are capitalized in separate cost centers for each
     country.  Such capitalized costs include lease acquisition costs, delay
     rentals, geophysical, geological and other costs, drilling, completion and
     other related costs and direct general and administrative expenses
     associated with property acquisition, exploration and development
     activities.  Capitalized general and administrative costs include internal
     costs such as salaries and related benefits paid to employees to the extent
     that they are directly engaged in such activities, as well as all other
     directly identifiable general and administrative costs associated with such
     activities, including rent, utilities and insurance and do not include any
     costs related to production, general corporate overhead, or similar
     activities.  Capitalized internal general and administrative costs were
     $129,000 in 1996, $156,000 in 1995 and $142,000 in 1994.

     Evaluated capitalized costs of oil and gas properties and the estimated
     future development, site restoration, dismantlement and abandonment costs
     are amortized by cost center, using the units-of-production method.  Total
     net future site restoration, dismantlement and abandonment costs are
     estimated to be $1,140,000  of which $723,000 has been provided through
     December 31, 1996.

     Depreciation, depletion and amortization expense per equivalent barrel of
     production was as follows:
     
     <TABLE> 
     <CAPTION> 
                                     1996        1995        1994
                                   ------       -----       -----
               <S>                 <C>          <C>         <C> 
               United States       $ 5.93       $4.12       $4.05
 
               Colombia            $11.49       $9.79       $7.90

     </TABLE> 
                                       41
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

 
     In accordance with the full cost method of accounting, the net capitalized
     costs of oil and gas properties less related deferred income taxes for each
     cost center are limited to the sum of the estimated future net revenues
     from the properties at current prices less estimated future expenditures,
     discounted at 10%, and unevaluated costs not being amortized, less income
     tax effects related to differences between the financial and tax bases of
     the properties, computed on a quarterly basis.

     Depletion expense and limits to capitalized costs are based on estimates of
     oil and gas reserves which are inherently imprecise and assume current
     prices for future net revenues.  Accordingly, it is reasonably possible
     that the estimates of reserves quantities and future net revenues could
     differ materially in the near term from amounts currently estimated.
     Moreover, a future decrease in the prices the Company receives for its oil
     and gas production or downward reserve adjustments could, for either the
     U.S. or Colombian cost centers, result in a ceiling test write-down that is
     significant to the Company's operating results.

     Gains and losses on sales of oil and gas properties are not recognized in
     income unless the sale involves a significant portion of the reserves
     associated with a particular cost center.  Capitalized costs associated
     with unevaluated properties are excluded from amortization until it is
     determined whether proved reserves can be assigned to such properties or
     until the value of the properties is impaired.  Unevaluated costs of
     $1,066,000 and $3,012,000 were excluded from amortization at December 31,
     1996 and 1995, respectively.  Unevaluated properties are assessed quarterly
     to determine whether any impairment has occurred.  The unevaluated costs at
     December 31, 1996 represent exploration costs and were incurred primarily
     during the four-year period ended December 31, 1996. Such costs are
     expected to be evaluated and included in the amortization computation
     within the next three years.

     The Company sold, on December 23, 1996, all of its remaining U.S. onshore
     oil and gas properties for $2,702,000 in cash, net of closing adjustments.
     The sale involved a significant portion of the reserves associated with the
     U.S. cost center and, accordingly, the resultant gain on the sale has been
     recognized in the accompanying Consolidated Statement of Operations for
     1996. (See note 4.)

     In July 1994, the Company sold its entire interest in one of its offshore
     properties, Ewing Bank 947, for $2,325,000 in cash.  The sale proceeds
     reduced the carrying value of the Company's oil and gas properties.

     Other property and equipment is depreciated using the straight line method
     over the estimated useful lives of the assets.

     Gas Balancing
     The Company uses the entitlements method of accounting for gas sales.  Gas
     production taken by the Company in excess of amounts entitled is recorded
     as a liability to the other joint owners.  Excess gas production taken by
     others is recognized as income to the extent of the Company's proportionate
     share of the gas sold and a related receivable is recorded from the other
     joint owners.

                                       42
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     Interest Expense
     The Company capitalizes interest costs on qualifying assets, principally
     unevaluated oil and gas properties.  During 1996, 1995 and 1994, the
     Company capitalized $189,000, $295,000 and $238,000 of interest,
     respectively.
 
     Loss Per Common Share
     Loss per common share is based on the weighted average common shares
     outstanding. The effects of common stock equivalents (note 5) are
     antidilutive.
 
     Income Taxes
     The Company accounts for income taxes in accordance with Statement of
     Financial Accounting Standards No. 109 ("Statement 109") which requires
     recognition of deferred tax assets in certain circumstances and deferred
     tax liabilities for the future tax consequences of temporary differences
     between the financial statement carrying amounts and the tax bases of
     assets and liabilities.

     Statement of Cash Flows
     The Company considers all highly liquid debt instruments with original
     maturities of three months or less to be cash equivalents.  The Company
     paid interest, net of amounts capitalized, of $834,000 in 1996, $591,000 in
     1995 and $183,000 in 1994 and paid income taxes of $111,000 in 1996,
     $178,000 in 1995 and $163,000 in 1994.

     Fair Value of Financial Instruments
     The reported values of cash, cash equivalents, accounts receivable and
     accounts payable approximate fair value due to their short maturities.  The
     reported value of long-term debt approximates its fair value since the
     applicable interest rate approximates market rates.

     Foreign Currency Translation
     The accounts of the Company's foreign operations are translated into United
     States dollars in accordance with Statement of Financial Accounting
     Standards No. 52.  The United States dollar is used as the functional
     currency.  Exchange adjustments resulting from foreign currency
     transactions are recognized in expense or income in the current period.

     Use of Estimates
     The preparation of financial statements in conformity with generally
     accepted accounting principles requires management to make estimates and
     assumptions that affect the reported amounts of assets and liabilities and
     disclosure of contingent assets and liabilities at the date of the
     financial statements and the reported amounts of revenues and expenses
     during the reporting period.  Actual results could differ from those
     estimates.

                                       43
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
 
(2) OTHER ASSETS
 
A summary of other assets follows:
<TABLE>
<CAPTION>

                                                        December 31
                                                    --------------------
                                                        (thousands)
                                                      1996          1995
                                                    ------        ------
<S>                                                 <C>           <C>

 Deferred financing charges                         $  225        $  344
 Gas balancing (note 10)                                 4           624
 Ecopetrol receivable, excluding current portion        76           180
 Abandonment funds for U.S. offshore properties        853           373
 Other                                                  46             -
                                                    ------        ------
 
                                                    $1,204        $1,521
                                                    ======        ======
</TABLE>

     Amounts due from Ecopetrol represent estimated costs which the Company is
     entitled to recover from Ecopetrol's share of oil production in Colombia.
     Accounts receivable - other include $85,000 and $341,000 for 1996 and 1995,
     respectively, representing the current portion of such costs.
 
(3)  LONG TERM DEBT
 
     A summary of long term debt follows:
<TABLE>
<CAPTION>
                                                   December 31
                                                -----------------
                                                    (thousands)
                                                   1996      1995
                                                -------   -------
<S>                                             <C>       <C>
 
 Note payable to ING Capital                    $ 7,990   $13,000
 
 Other obligation                                     -        67
                                                -------   -------
                                                  7,990    13,067
 Less current portion                             2,780     2,397
                                                -------   -------
                                                $ 5,210   $10,670
                                                =======   =======
</TABLE>

     On August 6, 1993, the Company entered into a credit agreement with ING
     (U.S.) Capital Corporation ("ING Capital"), secured by a mortgage on
     substantially all U.S. oil and gas assets, a pledge of Colombian assets and
     the stock of three subsidiaries, pursuant to which ING Capital agreed to
     loan to the Company up to $25 million, subject to an annually redetermined
     borrowing base which is predicated on the Company's U.S. and Colombian
     reserves. As of December 31, 1996, the borrowing base permitted, and the
     outstanding loan balance was, $7,990,000. The outstanding loan balance
     bears interest at the ING Capital prime rate (8.25% at December 31, 1996)
     plus 1% or, at the option of the Company, a fixed rate, based on the London
     Interbank Offered Rate, for a portion or portions of the outstanding debt
     from time to time. Commitment fees of .5% on the unused credit were payable
     quarterly until December 31, 1995, at which time the credit facility
     converted from a revolving credit facility to a term loan. The terms of the
     loan, among other things, prohibit the Company from merging with another
     company or paying dividends, limit additional indebtedness, general and
     administrative expense, sales of assets and investments and require the
     maintenance of certain minimum financial ratios. The agreement also
     requires the Company to maintain a minimum consolidated tangible net worth
     of $22,000,000.

                                       44
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                                        

     In December 1996, the Company entered into an agreement with ING Capital
     pursuant to which the outstanding loan balance was paid down to $7,990,000
     from $10,790,000 concurrent with the sale of the U.S. onshore properties
     and the repayment schedule was amended to require monthly payments of
     $25,000 for the first seven months of 1997 and $521,000 for the last five
     months of 1997 and the first ten months in 1998.

     The aggregate maturities of long term debt at December 31, 1996 are: 1997 -
     $2,780,000 and 1998 - $5,210,000.

     In consideration of certain modifications to the above referenced credit
     agreement in March 1996 the Company paid a fee of $100,000 to ING Capital.

(4)  INTEREST AND OTHER INCOME (EXPENSE)

     A summary of interest and other income (expense) follows:
<TABLE>
<CAPTION>
                                                        (thousands)
                                                  1996      1995      1994
                                                ------  -----------  ------
<S>                                             <C>    <C>          <C>
        Gain (loss) on sale of assets, net      $  651      $ (2)     $  -
        Interest income                            231       157       166
        Foreign currency exchange gain (loss)      (16)      164        (3)
        Other, net                                 195       176       (21)
                                                ------      ----      ----
                                                $1,061      $495      $142
                                                ======      ====      ====
</TABLE>
(5)  STOCKHOLDERS' EQUITY
 
     Quasi-Reorganization
     Effective December 31, 1992, the Board of Directors of the Company approved
     a quasi-reorganization which resulted in a reclassification of the
     accumulated deficit of $70,057,000 at that date to paid-in capital.   No
     adjustments were made to the Company's assets and liabilities since the
     historical carrying values approximated or did not exceed the estimated
     fair values.

     Stock Option Plans
     At December 31, 1996, the Company has two stock option plans, which are
     described below.  The Company applies APB Opinion No. 25 and related
     Interpretations in accounting for its plans.  Accordingly, no compensation
     cost has been recognized for its stock option plans.  Had compensation cost
     for the Company's stock option plans been determined consistent with FASB
     Statement No. 123, the Company's net loss and loss per share would have
     been increased to the pro forma amounts indicated below (in thousands,
     except per share data):
<TABLE>
<CAPTION>
                                                 1996          1995
                                                ------        -------
<S>                          <C>                <C>           <C>
 
          Net loss           As reported        $ (937)       $(2,689)
                                                        
                             Pro forma          $ (947)       $(2,805)
                                                        
          Loss per share     As reported        $(0.03)       $ (0.09)
                                                        
                             Pro forma          $(0.03)       $ (0.09)
</TABLE>

                                       45
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     At the Annual Meeting of Shareholders held on June 6, 1995, the Company's
     shareholders approved the adoption of the Aviva Petroleum Inc. 1995 Stock
     Option Plan (the "Current Plan"). The Current Plan is administered by a
     committee (the "Committee") composed of two or more outside directors of
     the Company, who are disinterested within the meaning of Rule 16b-3(c)
     under the Securities Exchange Act of 1934, as amended (the "Exchange Act").
     Except as indicated below and except for non-discretionary grants to non-
     employee directors, the Committee has authority to determine all terms and
     provisions under which options are granted pursuant to the Current Plan,
     including (i) the determination of which employees shall be eligible to
     receive options, (ii) the number of shares for which an option shall be
     granted and (iii) the terms and conditions upon which options may be
     granted.  Options will vest at such times and under such conditions as
     determined by the Committee, as permitted under the Current Plan.  An
     aggregate of up to 1,000,000 shares of the Company's common stock may be
     issued upon exercise of stock options or in connection with restricted
     stock awards that may be granted under the Current Plan.

     The aggregate fair market value (determined at the time of grant) of
     shares issuable pursuant to incentive stock options which first become
     exercisable in any calendar year by a participant in the Current Plan may
     not exceed $100,000.  The maximum number of shares of common stock which
     may be subject to an option or restricted stock grant awarded to a
     participant in a calendar year cannot exceed 100,000.  Incentive stock
     options granted under the Current Plan may not be granted at a price less
     than 100% of the fair market value of the common stock on the date of grant
     (or 110% of the fair market value in the case of incentive stock options
     granted to participants in the Current Plan holding 10% or more of the
     voting stock of the Company).  Non-qualified stock options may not be
     granted at a price less than 50% of the fair market value of the common
     stock on the date of grant.

     In 1995, upon adoption of the Current Plan, each of the non-employee
     directors of the Company was granted non-qualified stock options to
     purchase 30,000 shares of the Company's common stock.  These non-
     discretionary options are for a term of 10 years and become exercisable as
     to 10,000 shares of common stock on each of the first three anniversaries
     of the date of grant.  Non-discretionary options representing no more than
     200,000 shares of common stock may be granted under the Current Plan.

     As a result of the adoption of the Current Plan, the Company's former
     Incentive and Non-Statutory Stock Option Plan (the "1987 Plan") has been
     terminated as to the grant of new options, but options then outstanding for
     360,000 shares of the Company's common stock remain in effect.

     The fair value of each option grant is estimated on the date of grant using
     the Black-Scholes option-pricing model with the following weighted-average
     assumptions used for grants in 1996 and 1995: no dividend yield for either
     year; expected volatility of 77%; a risk-free interest rate of 7.0%; and
     expected lives of 5.0 and 7.3 years, respectively.

                                       46
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     A summary of the status of the Company's two fixed stock option plans as of
     December 31, 1996, 1995, and 1994, and changes during the years ended on
     those dates is presented below:
<TABLE>
<CAPTION>
                                      1996                1995                1994
                              -------------------  ------------------  ----------------
                                        Weighted-          Weighted-          Weighted-
                                         Average            Average            Average
                               Shares   Exercise   Shares  Exercise   Shares  Exercise
     Fixed Options             (000)     Price     (000)    Price      (000)    Price
     -------------            --------  ---------  ------  ---------  ------  ---------
<S>                           <C>       <C>        <C>     <C>        <C>     <C>
  
     Outstanding at
       beginning of year         716     $1.60       543     $1.82       831    $1.62
     Granted                      20       .74       173       .95         -        -
     Exercised                     -         -         -         -         -        -
     Forfeited                  (206)     1.25         -         -      (288)    1.24
                               -----                ----               -----
     Outstanding at                                                          
       end of year               530      1.80       716      1.60       543     1.82
                               =====                ====               =====    
     Options exercisable                                                     
       at year-end               401                 403                 263 
     Weighted-average fair                                                   
       value of options                                                      
       granted during                                                        
       the year                 $.50                $.72               $   - 
</TABLE>
     The following table summarizes information about fixed stock options
     outstanding at December 31, 1996:
<TABLE>
<CAPTION>
                              Options Outstanding                       Options Exercisable
                  -----------------------------------------------   ---------------------------
     Range          Number       Weighted-Avg.                        Number
      of          Outstanding      Remaining       Weighted-Avg.    Exercisable   Weighted-Avg.
Exercise Prices   at 12/31/96   Contractual Life   Exercise Price   at 12/31/96   Exercise Price
- ---------------   -----------   ----------------   --------------   -----------   --------------
<S>               <C>           <C>                <C>              <C>           <C>   
$ .74 to  1.08      423,000         6.8 years          $ 1.01         294,333          $ 1.05
 2.88 to  5.99       85,000         4.0                  3.61          85,000            3.61
 9.42 to 10.28       21,500         1.4                 10.22          21,500           10.22
- --------------      -------                                           ------- 
$ .74 to 10.28      529,500         6.2                  1.80         400,833            2.08
==============      =======                                           =======   
</TABLE>
(6)  SEVERANCE EXPENSE

     The Board of Directors had charged a committee of the Board with the task
     of reviewing the Company's general and administrative expenses and making
     recommendations as to the reduction of such expenses.  On March 18, 1996,
     the Board, acting on one of such committee's recommendations, determined to
     terminate the employment of the Executive Vice President and Chief
     Operating Officer of the Company (the "Officer") effective on June 1, 1996.
     In connection with the severance arrangements between the Company and the
     Officer, the Company incurred costs of $172,000.

                                       47
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     On July 25, 1996, the above mentioned committee was dissolved and its
     function was assumed by the entire Board of Directors.  In the third
     quarter of 1996, the Company incurred an additional $24,000 of severance
     expense relating to the termination of certain employees affected by the
     program.

(7)  INCOME TAXES
 
     Income tax expense includes current Colombian income taxes of $709,000 in
     1996, $398,000 in 1995 and $249,000 in 1994 and deferred Colombian income
     taxes (benefit) of $195,000 in 1996, $(5,000) in 1995 and $37,000 in 1994.
     Income tax expense also includes $7,000 and $18,000 of state income taxes
     in 1996 and 1995, respectively.

     The Company's effective tax rate differs from the U.S. statutory rate
     each year principally due to losses without tax benefit.

     The tax effects of temporary differences that give rise to significant
     portions of the deferred tax assets and deferred tax liabilities at
     December 31, 1996 and 1995 follow:
<TABLE>
<CAPTION>
                                                                 (thousands)
                                                                 1996       1995
                                                              -------    -------
<S>                                                           <C>        <C>
 
         Deferred tax assets - principally net operating 
           loss carryforwards                                 $41,604    $44,116
          Less valuation allowance                             36,126     39,124
                                                              -------    -------
 
          Net deferred tax assets                               5,478      4,992
 
         Deferred tax liabilities - property and equipment      6,170      5,489
                                                              -------    -------
 
          Net deferred tax liability                          $   692    $   497
                                                              =======    =======
</TABLE>

     The Company believes that the net deferred tax assets at December 31, 1996
     are realizable primarily through future reversals of existing taxable
     temporary differences. The valuation allowance for deferred tax assets at
     January 1, 1994 was $33,983,000. The net change in the valuation allowance
     was a $2,998,000 decrease in 1996, a $3,581,000 increase in 1995, and a
     $1,560,000 increase in 1994. Subsequently recognized tax benefits relating
     to the valuation allowance of $33,318,000 for deferred tax assets at
     January 1, 1993 will be credited to additional paid in capital.

     At December 31, 1996, the Company and its subsidiaries have aggregate net
     operating loss carryforwards for U.S. federal income tax purposes of
     approximately $117,000,000, expiring from 1997 through 2011, which are
     available to offset future federal taxable income.  The utilization of a
     portion of these net operating losses is subject to an annual limitation of
     approximately $2,400,000 and a portion may only be utilized by certain
     subsidiaries of the Company.

(8)  FINANCIAL INSTRUMENTS AND CREDIT RISK CONCENTRATIONS

     Financial instruments which are subject to risks due to concentrations of
     credit consist principally of cash and cash equivalents and receivables.
     Cash and cash equivalents are placed with high credit quality financial
     institutions to minimize risk. Receivables are typically unsecured.
     Historically, the Company has not experienced any material collection
     difficulties from its customers.

                                       48
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     Ecopetrol has an option to purchase all of the Company's production in
     Colombia. For the years ended December 31, 1996, 1995 and 1994, Ecopetrol
     exercised that option and sales to Ecopetrol accounted for $9,437,000
     (68.6%), $7,132,000 (65.3%) and $3,404,000 (39.8%), respectively, of the
     Company's aggregate oil and gas sales.

     For the years ended December 31, 1996, 1995 and 1994, sales to one U.S.
     purchaser accounted for $1,609,000 (11.7%), $1,422,000 (13.0%) and
     $1,144,000 (13.4%), respectively, of oil and gas sales.

(9)  COMMITMENTS AND CONTINGENCIES

     The Company, along with its co-owner (referred to collectively as the "Co-
     owners"), is engaged in an ongoing development and exploration program on
     concessions in Colombia.

     The contract obligations of the Santana concession have been met.  The Co-
     owners currently anticipate, however, completing one development well that
     is currently drilling, drilling two additional development wells and
     recompleting certain existing wells on the Santana concession.  As of
     December 31, 1996, future development costs included in the supplementary
     information related to oil and gas producing activities pursuant to SFAS 69
     include approximately $2.9 million, net to the Company's interest, for
     these expenditures.

     The Co-owners have completed a 3-D seismic survey over the Mary and
     Miraflor fields in the Santana concession and such data is currently being
     interpreted.  Additionally, a 2-D seismic program was initiated on the
     Yuruyaco concession in late December 1996.  As of December 31, 1996, the
     aggregate remaining future expenditures for these and certain other
     miscellaneous projects were approximately $1.0 million, net to the
     Company's interest.

     The Co-owners have completed their seismic obligations for the first two
     years of the La Fragua concession and were obligated to acquire additional
     seismic data for the third year.  The Co-owners determined, however, that
     it was not technically justified to explore this concession further and,
     accordingly, requested and received from Ecopetrol a change of commitment
     that would allow the Co-owners to substitute certain exploratory
     expenditures within the Santana concession for the remaining seismic
     commitment on the La Fragua concession.  The indigenous people of the new
     commitment area, however, have objected to the proposed exploratory work
     and it appears unlikely that the Co-owners will be able to comply with the
     new commitment.  Management of the Company believes that the Co-owners have
     no further obligation with respect to the La Fragua concession and,
     accordingly, have requested that Ecopetrol allow the Co-owners to surrender
     the concession without further expenditure.  Management of the Company
     believes that Ecopetrol will agree to such request, although there can be
     no assurance that this will be the case.  All unevaluated costs relating to
     the La Fragua concession have been transferred into the Colombian
     amortization base.

     The Company's aggregate remaining estimated exploratory and development
     expenditures for 1997 and 1998 were $3.9 million at December 31, 1996.  Any
     substantial increases in the amounts of the above referenced expenditures
     could adversely affect the Company's ability to meet these obligations.

     Failure to fund certain of these capital expenditures could, under either
     the concession agreements or joint operating agreements with the Company's
     co-owner, or both, result in the forfeiture of all or part of the Company's
     interest in these Colombian concessions.

                                       49
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The Company plans to fund these obligations using cash provided from
     operations.  Risks that could adversely affect funding of the Company's
     obligations include, among others, a decrease in the Company's borrowing
     base, delays in obtaining the required environmental approvals and permits,
     cost overruns, failure to produce the reserves as projected or a decline in
     the sales price of oil.  Depending on the results of the exploration and
     development activities, substantial expenditures which have not been
     included in the Company's cash flow projections may be required.  Although
     the ultimate outcome of these matters cannot be projected with certainty,
     management believes that its existing capital resources are adequate to
     fund its present obligations or that sufficient capital can be obtained by
     means of sales of assets or revision of current debt repayment terms to
     meet those obligations.

     Under the terms of the contracts with Ecopetrol, 25% of all revenues from
     oil sold to Ecopetrol is paid in Colombian pesos which may only be utilized
     in Colombia.  To date, the Company has experienced no difficulty in
     repatriating the remaining 75% of such payments, which are payable in U.S.
     dollars.
 
     Activities of the Company with respect to the exploration, development and
     production of oil and natural gas are subject to stringent environmental
     regulation by state and federal authorities, including the U.S.
     Environmental Protection Agency. Such regulation has increased the cost of
     planning, designing, drilling, operating and abandoning wells. In most
     instances, the regulatory requirements relate to air and water pollution
     control procedures and the handling and disposal of drilling and production
     wastes. Although the Company believes that compliance with environmental
     regulations will not have a material adverse effect on operations or
     earnings, risks of substantial costs and liabilities are inherent in oil
     and gas operations and there can be no assurance that significant costs and
     liabilities, including civil or criminal penalties for violations of
     environmental regulations, will not be incurred. Moreover, it is possible
     that other developments, such as stricter environmental laws and
     regulations or claims for damages to property or persons resulting from the
     Company's operations, could result in substantial costs and liabilities.
     The Company's policy is to accrue environmental and restoration related
     costs once it is probable that a liability has been incurred and the amount
     can be reasonably estimated.

     The Oil Pollution Act of 1990 ("OPA '90") and regulations thereunder impose
     a variety of requirements on "responsible parties" related to the
     prevention of oil spills and liability for damages resulting from such
     spills in waters of the United States. A "responsible party" includes the
     owner or operator of a facility or vessel, or the lessee or permittee of
     the area in which an offshore facility is located. OPA '90 assigns
     liability to each responsible party for oil spill removal costs and a
     variety of public and private damages from oil spills. While liability
     limits apply in some circumstances, a party cannot take advantage of
     liability limits if the spill is caused by gross negligence or willful
     misconduct, the spill resulted from violation of a federal safety,
     construction, or operating regulation, or a party fails to report a spill
     or to cooperate fully in the cleanup. Few defenses exist to the liability
     imposed under OPA '90 for oil spills. The failure to comply with these
     requirements or inadequate cooperation in a spill event may subject a
     responsible party to civil or criminal enforcement actions. Management of
     the Company is currently unaware of any oil spills for which the Company
     has been designated as a responsible party under OPA '90 and that will have
     a material adverse impact on the Company or its operations. OPA '90 also
     imposes ongoing requirements on facility operators, such as the preparation
     of an oil spill contingency plan. The Company has such plans in place.

                                       50
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     With recent amendments to OPA '90 signed into law by President Clinton on
     October 19, 1996, OPA '90 now requires responsible parties to establish and
     maintain $35 million in financial responsibility to cover environmental
     cleanup and restoration costs that might be incurred in connection with an
     oil spill in waters of the United States, including the waters of the Gulf
     of Mexico where the Company has its operations, unless a formal risk
     assessment indicates that increased financial responsibility coverage is
     warranted.  The Company's two U.S. properties, Main Pass Block 41 field, a
     federal lease on the outer continental shelf ("OCS") offshore Louisiana,
     and Breton Sound Block 31 field, on state leases offshore Louisiana, are
     subject to OPA '90 as amended.  Management of the Company believes that
     these two properties comply in all material respects with the amended OPA
     '90 requirements.

     The Outer Continental Shelf Lands Act ("OCSLA") imposes a variety of
     requirements relating to safety and environmental protection on lessees and
     permittees operating in the OCS. Specific design and operational standards
     may apply to OCS vessels, rigs, platforms, vehicles and structures.
     Violation of lease conditions or regulations issued pursuant to OCSLA can
     result in substantial civil and criminal penalties, as well as potential
     court injunctions curtailing operations and the cancellation of leases.
     Such enforcement liabilities can result from either governmental or private
     prosecution. The Company believes it is in material compliance with
     applicable OCSLA requirements.

     The Company is involved in certain litigation involving its oil and gas
     activities, but unrelated to environmental contamination issues.
     Management of the Company believes that these litigation matters will not
     have any material adverse effect on the Company's financial condition or
     results of operations.

     The Company has one lease for office space in Dallas, Texas, which expires
     in January 1999.  Rent expense relating to the lease was $84,000, $90,000
     and $88,000 for 1996, 1995 and 1994, respectively.  The lease is cancelable
     in January of 1998.  Future minimum payments under the lease are $109,000,
     primarily due in 1997.

(10) GAS BALANCING

     As of December 31, 1996 and 1995, other joint owners had sold net gas with
     a volume equivalent of approximately 2,000 thousand cubic feet ("MCF") and
     416,000 MCF (with an estimated value of $4,000 and $624,000 included in
     other assets), respectively, for which the Company is generally entitled to
     be repaid in volumes ("underproduced"). As of December 31, 1996 and 1995,
     the Company had sold net gas with a volume equivalent of approximately
     353,000 MCF and 741,000 MCF (with an estimated value of $724,000 and
     $1,300,000 included in gas balancing obligations and other), respectively,
     for which the other joint owners are entitled generally to be repaid in
     volumes ("overproduced"). In certain instances the parties have the option
     of requesting payment in cash.

     In connection with the sale of the Company's U.S. onshore properties,
     approximately 384,000 MCF for which the Company was underproduced and
     approximately 337,000 MCF for which the Company was overproduced were
     assumed by the buyer of such properties.

                                       51
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

 

(11) GEOGRAPHIC AREA INFORMATION

     The Company is engaged in the business of exploring for, developing and
     producing oil and gas in the United States and Colombia. Information about
     the Company's operations in different geographic areas as of and for the
     years ended December 31, 1996, 1995 and 1994 follows:
<TABLE>
<CAPTION>
(Thousands)
                                                    United
                                                    States   Colombia    Total
                                                    ------   --------   -------
     1996
     ----
     <S>                                            <C>       <C>       <C>
     Oil and gas sales                              $4,313    $ 9,437   $13,750
                                                    ------    -------   -------
 
     Expense:
      Production                                     1,926      2,908     4,834
      Depreciation, depletion and amortization       1,750      5,589     7,339
      General and administrative                     1,539         15     1,554
      Severance                                        196          -       196
                                                    ------    -------   -------
                                                     5,411      8,512    13,923
                                                    ------    -------   -------
 
 
     Interest and other income (expense), net          894        167     1,061
     Interest expense                                 (355)      (459)     (814)
     Debt refinancing expense                            -       (100)     (100)
                                                    ------    -------   -------
 
     Loss before income taxes                         (559)       533       (26)
     Income taxes                                       (7)      (904)     (911)
                                                    ------    -------   -------
 
     Net loss                                       $ (566)   $  (371)  $  (937)
                                                    ======    =======   =======
 
     Identifiable assets                            $6,838    $34,065   $40,903
                                                    ======    =======   
  
     Corporate assets-cash and cash equivalents                           2,041
                                                                        -------
 
     Total assets                                                       $42,944
                                                                        =======
</TABLE>

                                       52
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

<TABLE>
<CAPTION>
(Thousands)

                                                  United
                                                  States   Colombia     Total
                                                 -------   --------   ---------
     1995
     ----
<S>                                              <C>       <C>        <C>
     Oil and gas sales                           $ 3,796     $7,132     $10,928
                                                 -------    -------     -------
     Expense:
      Production                                   1,960      3,112       5,072
      Depreciation, depletion and amortization     1,349      4,406       5,755
      General and administrative                   2,306         10       2,316
                                                 -------    -------     -------
                                                   5,615      7,528      13,143
                                                 -------    -------     -------

     Interest and other income (expense), net        100        395         495
     Interest expense                               (371)      (187)       (558)
                                                 -------    -------     -------

     Loss before income taxes                     (2,090)      (188)     (2,278)
     Income taxes                                    (18)      (393)       (411)
                                                 -------    -------     -------

     Net loss                                    $(2,108)     $(581)    $(2,689)
                                                 =======    =======     =======

     Identifiable assets                         $ 7,398    $33,862     $41,260
                                                 =======    =======     

     Corporate assets-cash and cash equivalents                           4,200
                                                                        -------

     Total assets                                                       $45,460
                                                                        =======

     1994
     ----
     Oil and gas sales                           $ 5,142    $ 3,404     $ 8,546
                                                 -------    -------     -------
     Expense:
      Production                                   2,230      2,290       4,520
      Depreciation, depletion and amortization     1,839      2,145       3,984
      General and administrative                   2,072         11       2,083
                                                 -------    -------     -------

                                                   6,141      4,446      10,587
                                                 -------    -------     -------

     Interest and other income (expense), net        (11)       153         142
     Interest expense                               (275)         -        (275)
                                                 -------    -------     -------

     Loss before income taxes                     (1,285)      (889)     (2,174)
     Income taxes                                      -       (286)       (286)
                                                 -------    -------     -------

     Net loss                                    $(1,285)   $(1,175)    $(2,460)
                                                 =======    =======     =======

     Identifiable assets                         $ 8,366    $32,035     $40,401
                                                 =======    =======     

     Corporate assets-cash and cash equivalents                           1,982
                                                                        -------

     Total assets                                                       $42,383
                                                                        =======
</TABLE>

                                       53
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                                  (UNAUDITED)

The following information relating to the Company's oil and gas activities is
presented in accordance with Statement of Financial Accounting Standards No. 69.
The Financial Accounting Standards Board has determined the information is
necessary to supplement, although not required to be a part of, the basic
financial statements.

Capitalized costs and accumulated depreciation, depletion and amortization
relating to oil and gas producing activities were as follows:
<TABLE>
<CAPTION>
(Thousands)
                                           United
                                           States       Colombia        Total
                                           ------       --------       -------
<S>                                        <C>          <C>            <C>
December 31, 1996
- -----------------
 
Unevaluated oil and gas properties         $   182       $   884       $ 1,066
Proved oil and gas properties               11,835        45,423        57,258
                                           -------       -------       -------
                                                                 
 Total capitalized costs                    12,017        46,307        58,324
                                                                 
Less accumulated depreciation,                                   
 depletion and amortization                  7,508        15,971        23,479
                                           -------       -------       -------
                                                                 
 Capitalized costs, net                    $ 4,509       $30,336       $34,845
                                           =======       =======       =======
                                                                 
                                                                 
December 31, 1995                                                
- -----------------                             
                                                                 
Unevaluated oil and gas properties         $     -       $ 3,012       $ 3,012
Proved oil and gas properties               39,649        37,883        77,532
                                           -------       -------       -------
                                                                 
 Total capitalized costs                    39,649        40,895        80,544
                                                                 
Less accumulated depreciation,                                   
 depletion and amortization                 34,646        10,501        45,147
                                           -------       -------       -------
                                                                 
 Capitalized costs, net                    $ 5,003       $30,394       $35,397
                                           =======       =======       =======
 
</TABLE>

                                       54
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)

Costs incurred in oil and gas property acquisition, exploration and development
activities were as follows:
<TABLE>
<CAPTION>
(Thousands)
                                          United
                                          States       Colombia        Total
                                          ------       --------       ------
<S>                                       <C>          <C>            <C>
1996                                                
- ----                                             
                                                 
Exploration                               $    -        $1,382        $1,382
Development                                3,239         4,030         7,269
                                          ------        ------        ------
   Total costs incurred                   $3,239        $5,412        $8,651
                                          ======        ======        ======
                                                               
1995                                                           
- ----                                                                 
                                                                     
Exploration                               $    -        $1,477        $1,477
Development                                  172         5,784         5,956
                                          ------        ------        ------
   Total costs incurred                   $  172        $7,261        $7,433
                                          ======        ======        ======
                                                               
1994                                                           
- ----                                                                 
                                                                     
Exploration                               $    -        $2,037        $2,037
Development                                  535         4,848         5,383
Acquisition of proved properties              51             -            51
                                          ------        ------        ------
   Total costs incurred                   $  586        $6,885        $7,471
                                          ======        ======        ======
                                                               
</TABLE>                                                             
                                                                     

                                       55
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)

The following schedule presents the Company's estimate of its proved oil and gas
reserves.  The proved oil reserves in Colombia and the United States were
determined by independent petroleum engineers, Huddleston & Co., Inc. and
Netherland, Sewell & Associates, Inc., respectively.  The figures presented are
estimates of reserves which may be expected to be recovered commercially at
current prices and costs.  Estimates of proved developed reserves include only
those reserves which can be expected to be recovered through existing wells with
existing equipment and operating methods.  Estimates of proved undeveloped
reserves include only those reserves which are expected to be recovered on
undrilled acreage from new wells which are reasonably certain of production when
drilled or from presently existing wells which could require relatively major
expenditures to effect recompletion.
<TABLE>
<CAPTION>
                                        Changes in the Estimated Quantities
                                                   of Reserves
                                   --------------------------------------------
                                     United
                                     States            Colombia          Total
                                   ----------          --------         -------
<S>                                <C>                 <C>                <C>
Year ended December 31, 1996       
- ----------------------------       
                                   
Oil (Thousands of barrels)         
Proved reserves:                   
 Beginning of period                    564              3,255           3,819
 Revisions of previous estimates        (74)                38             (36)
 Discoveries and extensions               6                  -               6
 Sales of reserves                      (97)                 -             (97)
 Production                             (94)              (476)           (570)
                                     ------              -----          ------
                                   
 End of period                          305              2,817           3,122
                                     ======              =====          ======
                                   
Proved developed reserves, end     
  of period                             305              2,008           2,313
                                     ======              =====          ======
                                   
                                   
                                   
Gas (Millions of cubic feet)       
Proved reserves:                   
 Beginning of period                  7,037                  -           7,037
 Revisions of previous estimates       (770)                 -            (770)
 Discoveries and extensions              23                  -              23
 Sales of reserves                   (3,462)                 -          (3,462)
 Production                          (1,146)                 -          (1,146)
                                     ------              -----          ------
                                   
 End of period                        1,682                  -           1,682
                                     ======              =====          ======
                                   
Proved developed reserves,         
  end of period                       1,682                  -           1,682
                                     ======              =====          ======
</TABLE>

                                       56
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)
<TABLE>
<CAPTION>
                                    Changes in the Estimated Quantities
                                                 of Reserves
                                   --------------------------------------
                                     United
                                     States      Colombia          Total
                                   ----------    --------         -------
<S>                                <C>           <C>                <C>
Year ended December 31, 1995                 
- ----------------------------                 
                                             
Oil (Thousands of barrels)                   
Proved reserves:                             
 Beginning of period                  678          4,003           4,681
 Revisions of previous estimates       (3)          (743)           (746)
 Discoveries and extensions             -            430             430
 Sales of reserves                     (5)             -              (5)
 Production                          (106)          (435)           (541)
                                   ------          -----          ------
                                             
 End of period                        564          3,255           3,819
                                   ======          =====          ======
                                             
Proved developed reserves,                   
  end of period                       460          1,601           2,061
                                   ======          =====          ======
                                             
                                             
                                             
Gas (Millions of cubic feet)                 
Proved reserves:                             
 Beginning of period                8,552              -           8,552
 Revisions of previous estimates     (257)             -            (257)
 Sales of reserves                    (74)             -             (74)
 Production                        (1,184)             -          (1,184)
                                   ------          -----          ------
                                             
 End of period                      7,037              -           7,037
                                   ======          =====          ======
                                             
Proved developed reserves,                   
  end of period                     6,779              -           6,779
                                   ======          =====          ======
</TABLE>

                                       57
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)
<TABLE>
<CAPTION>
                                    Changes in the Estimated Quantities
                                                 of Reserves
                                   --------------------------------------
                                     United
                                     States         Colombia       Total
                                   ----------       --------      -------
<S>                                <C>              <C>           <C>
Year ended December 31, 1994
- ----------------------------
 
Oil (Thousands of barrels)
Proved reserves:
 Beginning of period                   548            4,612        5,160
 Revisions of previous estimates       253             (359)        (106)
 Sales of reserves                     (24)               -          (24)
 Production                            (99)            (250)        (349)
                                    ------            -----       ------
                                                                  
 End of period                         678            4,003        4,681
                                    ======            =====       ======
                                                                  
Proved developed reserves,                                        
  end of period                        426            1,797        2,223
                                    ======            =====       ======
                                                                  
                                                                  
                                                                  
Gas (Millions of cubic feet)                                      
Proved reserves:                                                  
 Beginning of period                11,946                -       11,946
 Revisions of previous estimates      (359)               -         (359)
 Sales of reserves                  (1,196)               -       (1,196)
 Production                         (1,839)               -       (1,839)
                                    ------            -----       ------
                                                                  
 End of period                       8,552                -        8,552
                                    ======            =====       ======
                                                                  
Proved developed reserves,                                        
  end of period                      6,741                -        6,741
                                    ======            =====       ======        
</TABLE>

                                       58
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)
                                        
The following schedule is a standardized measure of the discounted net future
cash flows applicable to proved oil and gas reserves.  The future cash flows are
based on estimated oil and gas reserves utilizing prices and costs in effect as
of the applicable year end, discounted at ten percent per year and assuming
continuation of existing economic conditions.  The standardized measure of
discounted future net cash flows, in the Company's opinion, should be examined
with caution.  The schedule is based on estimates of the Company's proved oil
and gas reserves prepared by independent petroleum engineers.  Reserve estimates
are, however, inherently imprecise and estimates of new discoveries are more
imprecise than those of producing oil and gas properties.  Accordingly, the
estimates are expected to change as future information becomes available.
Therefore, the standardized measure of discounted future net cash flows does not
necessarily reflect the fair value of the Company's proved oil and gas
properties.
<TABLE>
<CAPTION>
(Thousands)                            United
                                       States      Colombia       Total
                                      -------      --------      --------
<S>                                   <C>          <C>        <C>
At December 31, 1996:
- ---------------------
 
Future gross revenues                 $14,070      $ 63,666      $ 77,736
Future production costs                (6,128)      (11,362)      (17,490)
Future development costs                 (970)       (3,067)       (4,037)
                                      -------      --------      --------
Future net cash flows before                                   
 income taxes                           6,972        49,237        56,209
Future income taxes                       (51)       (1,052)       (1,103)
                                      -------      --------      --------
Future net cash flows after                                    
 income taxes                           6,921        48,185        55,106
                                                               
Discount at 10% per annum                (993)       (9,513)      (10,506)
                                      -------      --------      --------
Standardized measure of discounted                             
 future net cash flows                $ 5,928      $ 38,672      $ 44,600
                                      =======      ========      ========
</TABLE>

                                       59
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)
<TABLE>
<CAPTION>
(Thousands)                          United
                                     States        Colombia         Total
                                   ----------      --------        --------
<S>                                   <C>          <C>             <C>
At December 31, 1995:
- ---------------------
 
Future gross revenues              $ 24,720        $ 57,258        $ 81,978
Future production costs             (11,371)        (14,881)        (26,252)
Future development costs             (2,153)         (4,529)         (6,682)
                                   --------        --------        --------
Future net cash flows before                                    
 income taxes                        11,196          37,848          49,044
Future income taxes                    (121)           (376)           (497)
                                   --------        --------        --------
Future net cash flows after                                     
 income taxes                        11,075          37,472          48,547
                                                                
Discount at 10% per annum            (2,930)        (10,182)        (13,112)
                                   --------        --------        --------
Standardized measure of discounted                              
 future net cash flows             $  8,145        $ 27,290        $ 35,435
                                   ========        ========        ========
                                                                
                                                                
                                                                
At December 31, 1994:                                           
- ---------------------                                           
                                                                
Future gross revenues              $ 25,996        $ 62,194        $ 88,190
Future production costs             (12,348)        (13,446)        (25,794)
Future development costs             (2,323)         (7,131)         (9,454)
                                   --------        --------        --------
Future net cash flows before                                    
 income taxes                        11,325          41,617          52,942
Future income taxes                    (104)         (3,320)         (3,424)
                                   --------        --------        --------
Future net cash flows after                                     
 income taxes                        11,221          38,297          49,518
                                                                
Discount at 10% per annum            (3,011)         (8,998)        (12,009)
                                   --------        --------        --------
Standardized measure of discounted                               
 future net cash flows             $  8,210        $ 29,299        $ 37,509
                                   ========        ========        ========
</TABLE>

                                       60
<PAGE>
 
                     AVIVA PETROLEUM INC. AND SUBSIDIARIES
     SUPPLEMENTARY INFORMATION RELATED TO OIL AND GAS PRODUCING ACTIVITIES
                            (UNAUDITED) (CONTINUED)


The following schedule summarizes the changes in the standardized measure of
discounted future net cash flows.
<TABLE>
<CAPTION>
(Thousands)
                                                   1996      1995      1994
                                                 --------  --------  --------
<S>                                              <C>       <C>       <C>
 
Sales of oil and gas, net of production costs    $(8,916)  $(5,856)  $(4,026)
Sales of reserves in place                        (3,924)      (44)   (3,045)
Development costs incurred that reduced
 future development costs                          3,043     3,713     4,127
Accretion of discount                              3,577     4,009     3,438
Discoveries and extensions                            87     4,521         -
Revisions of previous estimates:
 Changes in price                                 13,468     2,263     9,395
 Changes in quantities                               153    (7,582)   (2,184)
 Changes in future development costs                 (86)     (723)     (581)
 Changes in timing and other changes               2,303    (4,623)   (1,414)
 Changes in estimated income taxes                  (540)    2,248    (2,084)
                                                 -------   -------   -------
 
 Net increase (decrease)                           9,165    (2,074)    3,626
 
Balances at beginning of year                     35,435    37,509    33,883
                                                 -------   -------   -------
 
Balances at end of year                          $44,600   $35,435   $37,509
                                                 =======   =======   =======
</TABLE>

                                       61
<PAGE>
 
                               INDEX TO EXHIBITS
                                        
                                                                    Sequentially
                                                                      Numbered
Number                      Description of Exhibit                       Page
- ------                      ----------------------                  ------------

  *3.1   Restated Articles of Incorporation of the Company dated 
         July 25, 1995 (filed as exhibit 3.1 to the Company's annual report on
         Form 10-K for the year ended December 31, 1995, File No. 0-22258, and
         incorporated herein by reference).

  *3.2   Amended and Restated Bylaws of the Company, as amended 
         as of January 23, 1995 (filed as exhibit 3.2 to the 
         Company's annual report on Form 10-K for the year ended 
         December 31, 1994, File No. 0-22258, and incorporated 
         herein by reference).

 *10.1   Risk Sharing Contract between Empresa Colombiana de 
         Petroleos ("Ecopetrol"), Argosy Energy International 
         ("Argosy") and Neo Energy, Inc. ("Neo") (filed as 
         exhibit 10.1 to the Company's Registration Statement on 
         Form 10, File No. 0-22258, and incorporated herein by
         reference).

 *10.2   Contract for Exploration and Exploitation of Sector 
         Number 1 of the Aporte Putumayo Area ("Putumayo") 
         between Ecopetrol and Cayman Corporation of Colombia dated 
         July 24, 1972 (filed as exhibit 10.2 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and
         incorporated herein by reference).

 *10.3   Operating Agreement for Putumayo between Argosy and Neo 
         dated September 16, 1987 and amended on January 4, 1989 
         and February 23, 1990 (filed as exhibit 10.3 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

 *10.4   Operating Agreement for the Santana Area ("Santana") 
         between Argosy and Neo dated September 16, 1987 and 
         amended on January 4, 1989, February 23, 1990 and 
         September 28, 1992 (filed as exhibit 10.4 to the
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

 *10.5   Agreement of Withdrawal from Argosy dated September 16, 
         1987 by and among Argosy, Neo, and Argosy Energy 
         Incorporated, as general partners; and Parkside 
         Investments, Richard Shaner McKnight, Douglas W. Fry, P-5
         Ltd., GO-DEO, Inc., Dale E. Armstrong, Richard Shane 
         McKnight, The Yvonne McKnight Trust, and William Gaskin, 
         as limited partners (filed as exhibit 10.5 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and 
         incorporated herein by reference).

 *10.6   Option Agreement dated September 16, 1987 between the 
         general and limited partners of Argosy and Neo (filed as 
         exhibit 10.6 to the Company's Registration Statement on 
         Form 10, File No. 0-22258, and incorporated herein by 
         reference).

 *10.7   Escrow Agreement between Argosy, Neo, Overseas Private 
         Investment Corporation and The Chase Manhattan Bank dated 
         March 15, 1988 and amended on May 31, 1990 (filed as 
         exhibit 10.7 to the Company's Registration Statement on 
         Form 10, File No. 0-22258, and incorporated herein by 
         reference).

 *10.8   Santana Block A Relinquishment dated March 6, 1990 between
         Ecopetrol, Argosy and Neo (filed as exhibit 10.8 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

 *10.9   Purchase Sale - Transportation and Commercialization of 
         the Santana Crude between Ecopetrol, Argosy and Neo 
         (filed as exhibit 10.9 to the Company's Registration 
         Statement on Form 10, File No. 0-22258, and incorporated 
         herein by reference).

 *10.10  La Fragua Association Contract dated June 1, 1992 between
         Ecopetrol, Argosy and Neo (filed as exhibit 10.10 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

                                       62
<PAGE>
 
                                                                    Sequentially
                                                                      Numbered
Number                      Description of Exhibit                       Page
- ------                      ----------------------                  ------------

*10.11   Operating Agreement for the La Fragua Area between Argosy 
         and Neo dated April 15, 1992 (filed as exhibit 10.11 to 
         the Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.12   Employment Agreement between the Company and Ronald Suttill 
         dated November 29, 1991 (filed as exhibit 10.12 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.13   Employee Stock Option Plan of the Company (filed as exhibit 
         10.13 to the Company's Registration Statement on Form 10, 
         File No. 0-22258, and incorporated herein by reference).

*10.14   Letter agreement dated January 6, 1993 between NationsBank
         Investment Banking and the Company (filed as exhibit 10.14 
         to the Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.15   Letter agreement dated March 3, 1993 between EnCap 
         Investments L.C. and the Company (filed as exhibit 10.15 
         to the Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.16   Credit Agreement dated August 6, 1993 between the Company, 
         Aviva America, Inc. ("Aviva America"), Neo and 
         Internationale Nederlanden Bank N.V., New York Branch 
         ("ING Capital") (filed as exhibit 10.16 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and
         incorporated herein by reference).

*10.17   Subordination Agreement dated August 6, 1993 between the 
         Company, Aviva America, Aviva Operating Company ("Aviva 
         Operating"), Neo and ING Capital (filed as exhibit 10.17 to 
         the Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.18   Stock Pledge Agreement dated August 6, 1993 between the 
         Company and ING Capital (filed as exhibit 10.18 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.19   Stock Pledge Agreement dated August 6, 1993 between Aviva 
         America and ING Capital (filed as exhibit 10.19 to the 
         Company's Registration Statement on Form 10, File No. 
         0-22258, and incorporated herein by reference).

*10.20   Guaranty dated August 6, 1993 made by the Company in favor 
         of ING Capital (filed as exhibit 10.20 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, 
         and incorporated herein by reference).

*10.21   Guaranty dated August 6, 1993 made by Aviva America in 
         favor of ING Capital (filed as exhibit 10.21 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and 
         incorporated herein by reference).

*10.22   Guaranty dated August 6, 1993 made by Aviva Operating in 
         favor of ING Capital (filed as exhibit 10.22 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and 
         incorporated herein by reference).

*10.23   Form of Subscription Agreement dated June 18, 1993 between 
         the Company and purchasers of 12,884,207 shares of common 
         stock ("Purchasers") (filed as exhibit 10.23 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and 
         incorporated herein by reference).

*10.24   Option Agreement between RBS and Aviva Energy Inc. ("Aviva
         Energy") dated July 1, 1993 (filed as exhibit 10.24 to the 
         Company's Registration Statement on Form 10, File No. 0-22258, 
         and incorporated herein by reference).

                                       63
<PAGE>
 
                                                                    Sequentially
                                                                      Numbered
Number                      Description of Exhibit                       Page
- ------                      ----------------------                  ------------

*10.25   Option Agreement between Aviva Energy and Purchasers dated 
         July 1, 1993 (filed as exhibit 10.25 to the Company's 
         Registration Statement on Form 10, File No. 0-22258, and 
         incorporated herein by reference).

*10.26   Santana Block B 50% relinquishment dated September 13, 1993
         between Ecopetrol, Argosy and Neo (filed as exhibit 10.26 
         to the Company's annual report on Form 10-K for the year 
         ended December 31, 1993, File No. 0-22258, and incorporated 
         herein by reference).

*10.27   Amendment to La Fragua Association contract dated December 
         2, 1993 between Ecopetrol, Argosy and Neo (filed as exhibit 
         10.27 to the Company's annual report on Form 10-K for the 
         year ended December 31, 1993, File No. 0-22258, and 
         incorporated herein by reference).

*10.28   Letter from Ecopetrol dated February 24, 1994 and 
         Resolution dated February 18, 1994 revising pipeline tariff 
         (filed as exhibit 10.28 to the Company's annual report on 
         Form 10-K for the year ended December 31, 1993, File No. 
         0-22258, and incorporated herein by reference).

*10.29   Aviva Petroleum Inc. 401(k) Retirement Plan effective 
         March 1, 1992 (filed as exhibit 10.29 to the Company's 
         annual report on Form 10-K for the year ended December 31, 
         1993, File No. 0-22258, and incorporated herein by 
         reference).

*10.30   Relinquishment of Putumayo dated December 1, 1993 (filed as
         exhibit 10.30 to the Company's annual report on Form 10-K 
         for the year ended December 31, 1993, File No. 0-22258, and 
         incorporated herein by reference).

*10.31   Amendment to ING Capital agreement dated March 28, 1994 (filed 
         as exhibit 10.31 to the Company's annual report on Form 
         10-K for the year ended December 31, 1993, File No. 
         0-22258, and incorporated herein by reference).

*10.32   Deposit Agreement dated September 15, 1994 between the 
         Company and Chemical Shareholder Services Group, Inc. 
         (filed as exhibit 10.29 to the Company's Registration 
         Statement on Form S-1, File No. 33-82072, and incorporated 
         herein by reference).

*10.33   Form of Registration Agreement dated as of September 15, 
         1994 between the Company and Shearson Lehman Brothers Inc. 
         (filed as exhibit 10.30 to the Company's Registration 
         Statement on Form S-1, File No. 33-82072, and incorporated 
         herein by reference).

*10.34   Form of Registration Agreement and Limited Power of 
         Attorney dated as of September  15, 1994 between the  
         Company and all other Selling Shareholders (filed as 
         exhibit 10.31 to the Company's Registration Statement on 
         Form S-1, File No. 33-82072, and incorporated herein by
         reference).

*10.35   Form of Broker-Dealer Agreement dated as of October 19, 1994
         between the Company and Petrie Parkman & Co. (filed as 
         exhibit 10.32 to the Company's Registration Statement on 
         Form S-1, File No. 33-82072, and incorporated herein by 
         reference).

*10.36   Purchase and Sale Agreement dated July 22, 1994 by and 
         between Newfield Exploration Company and Aviva America 
         (filed as exhibit 10.33 to the Company's Registration 
         Statement on Form S-1, File No. 33-82072, and incorporated 
         herein by reference).

*10.37   Letter from ING Capital dated October 27, 1994, amending 
         Section 5.2(n) of the Credit Agreement (filed as exhibit 
         10.37 to the Company's annual report on Form 10-K for the 
         year ended December 31, 1994, File No. 0-22258, and 
         incorporated herein by reference).

                                       64
<PAGE>
 
                                                                    Sequentially
                                                                      Numbered
Number                      Description of Exhibit                       Page
- ------                      ----------------------                  ------------

*10.38   Letter from Ecopetrol dated December 28, 1994, accepting
         relinquishment of Putumayo (filed as exhibit 10.38 to the 
         Company's annual report on Form 10-K for the year ended 
         December 31, 1994, File No. 0-22258, and incorporated 
         herein by reference).

*10.39   Letter from Ecopetrol dated February 28, 1995, accepting
         modifications to the La Fragua Association Contract (filed 
         as exhibit 10.39 to the Company's annual report on Form 
         10-K for the year ended December 31, 1994, File No. 0-22258, 
         and incorporated herein by reference).

*10.40   Amendment to ING Capital Credit Agreement dated March 7, 1995 
         (filed as exhibit 10.40 to the Company's annual report on 
         Form 10-K for the year ended December 31, 1994, File No. 
         0-22258, and incorporated herein by reference).

*10.41  Santana Crude Oil Sale Contract dated March 19, 1995 (filed 
        as exhibit 10.41 to the Company's annual report on Form 10-K 
        for the year ended December 31, 1994, File No. 0-22258, and 
        incorporated herein by reference).

*10.42  Employment Agreement between the Company and Ronald Suttill
        effective January 1, 1995 (filed as exhibit 10.1 to the 
        Company's quarterly report on Form 10-Q for the quarter 
        ended March 31, 1995, File No. 0-22258, and incorporated 
        herein by reference). 

*10.43  Employment Agreement between the Company and Robert C. Boyd
        effective January 1, 1995 (filed as exhibit 10.2 to the 
        Company's quarterly report on Form 10-Q for the quarter 
        ended March 31, 1995, File No. 0-22258, and incorporated 
        herein by reference).

*10.44  Amendment to ING Capital Credit Agreement dated June 9, 1995 
        (filed as exhibit 10.3 to the Company's quarterly report on 
        Form 10-Q for the quarter ended June 30, 1995, File No. 
        0-22258, and incorporated herein by reference).

*10.45  Amendment to the Incentive and Nonstatutory Stock Option 
        Plan of the Company (filed as exhibit 10.4 to the Company's 
        quarterly report on Form 10-Q for the quarter ended 
        September 30, 1995, File No. 0-22258, and incorporated 
        herein by reference).

*10.46  Aviva Petroleum Inc. 1995 Stock Option Plan (filed as 
        exhibit 10.5 to the Company's quarterly report on Form 10-Q 
        for the quarter ended September 30, 1995, File No. 0-22258, 
        and incorporated herein by reference).

*10.47  Yuruyaco Association Contract dated September 20, 1995 
        between Ecopetrol, Argosy and Neo (filed as exhibit 10.6 to 
        the Company's quarterly report on Form 10-Q for the quarter 
        ended September 30, 1995, File No. 0-22258, and incorporated 
        herein by reference).

*10.48  Letter from ING Capital dated November 3, 1995, amending 
        Section 5.2(n) of the Credit Agreement (filed as exhibit 
        10.7 to the Company's quarterly report on Form 10-Q for the 
        quarter ended September 30, 1995, File No. 0-22258, and 
        incorporated herein by reference).

*10.49  Amendment to the Santana Crude Oil Sale Contract (filed as 
        exhibit 10.49 to the Company's annual report on Form 10-K 
        for the year ended December 31, 1995, File No. 0-22258, and 
        incorporated herein by reference).

*10.50  Amendment to the La Fragua Association Contract dated 
        April 27, 1995 (filed as exhibit 10.50 to the Company's 
        annual report on Form 10-K for the year ended December 31, 
        1995, File No. 0-22258, and incorporated herein by reference).

*10.51  Santana Block B 25% relinquishment dated October 2, 1995 
        (filed as exhibit 10.51 to the Company's annual report on 
        Form 10-K for the year ended December 31, 1995, File No. 
        0-22258, and incorporated herein by reference).

                                       65
<PAGE>
 
                                                                    Sequentially
                                                                      Numbered
Number                      Description of Exhibit                       Page
- ------                      ----------------------                  ------------

 *10.52  Amendment to the La Fragua Association Contract dated 
         August 1, 1995 (filed as exhibit 10.52 to the Company's 
         annual report on Form 10-K for the year ended December 31, 
         1995, File No. 0-22258, and incorporated herein by 
         reference).

 *10.53  Operating Agreement for the Yuruyaco Area between Argosy 
         and Neo dated November 7, 1995 (filed as exhibit 10.53 to 
         the Company's annual report on Form 10-K for the year ended 
         December 31, 1995, File No. 0-22258, and incorporated 
         herein by reference).

 *10.54  Letter from ING Capital dated March 19, 1996, revising the 
         borrowing base and schedule of principal repayments and 
         Section 5.2 (m) of the Credit Agreement (filed as exhibit 
         10.54 to the Company's annual report on Form 10-K for the 
         year ended December 31, 1995, File No. 0-22258, and 
         incorporated herein by reference).

 *10.55  Amendment to the ING Capital Credit Agreement dated March 29, 
         1996 (filed as exhibit 10.1 to the Company's quarterly report 
         on Form 10-Q for the quarter ended March 31, 1996, File 
         No. 0-22258, and incorporated herein by reference).
 
 *10.56  Aviva Petroleum Inc. Severance Benefit Plan (filed as 
         exhibit 10.2 to the Company's quarterly report on Form 10-Q 
         for the quarter ended March 31, 1996, File No. 0-22258, and 
         incorporated herein by reference).
 
**10.57  Amendment to the ING Capital Credit Agreement dated November 
         22, 1996.
     
**10.58  Purchase and Sale Agreement dated November 22, 1996 between 
         BWAB Incorporated and Aviva America.

**10.59  Purchase and Sale Agreement dated December 6, 1996 between 
         Lomak Petroleum Inc. and Aviva America.
     
**10.60  Santana Crude Sale and Purchase Agreement dated February 10,
         1997.

 *21.1   List of subsidiaries of Aviva Petroleum Inc.


**27.1   Financial Data Schedule

- -----------------------
* Previously Filed
**Filed Herewith

                                       66

<PAGE>
 
                                                                   EXHIBIT 10.57

            SIXTH AMENDMENT TO CREDIT AGREEMENT AND PROMISSORY NOTE

          THIS SIXTH AMENDMENT TO CREDIT AGREEMENT AND PROMISSORY NOTE (herein
called this "Amendment") is made as of the 22nd day of November, 1996 by and
between Neo Energy, Inc., a Texas corporation ("Borrower"), Aviva Petroleum
Inc., a Texas corporation ("Aviva Petroleum"), Aviva America, Inc., a Delaware
corporation ("Aviva America"), and ING (U.S.) Capital Corporation (formerly
named Internationale Nederlanden (U.S.) Capital Corporation), a Delaware
corporation ("Lender").

                                   RECITALS:

          1.  Borrower, Aviva Petroleum, Aviva America and Internationale
Nederlanden Bank N.V., New York Branch (the "Bank") entered into that certain
Credit Agreement dated as of August 6, 1993.

          2.  Pursuant to such Credit Agreement, Borrower executed and delivered
to Bank that certain Promissory Note dated as of August 6, 1993 made payable to
the order of Bank in the stated principal amount of $25,000,000 (as heretofore
amended, the "Original Note").

          3.  To secure repayment of the Original Note, Aviva America executed
and delivered to Bank that certain Deed of Trust, Open-End Mortgage, Assignment,
Security Agreement and Financing Statement dated August 6, 1993 (as from time to
time modified or restated, the "Mortgage"), which granted Bank a Lien on certain
of Aviva America's oil and gas properties, including without limitation all of
Aviva America's oil and gas properties (the "Subject Properties") described on
Exhibits A and B to that certain Purchase and Sale Agreement dated of even date
herewith by and between Aviva America and BWAB Incorporated (the "Purchase and
Sale Agreement").

          4.  Pursuant to that certain Assignment and Assumption dated as of
September 8, 1993, between Lender and Bank, Bank assigned to Lender all of
Bank's rights, interests and obligations in and to such Credit Agreement, the
Original Note, the Mortgage and the other Loan Documents (as such term is
defined in such Credit Agreement).

          5.  Such Credit Agreement has been amended by (a) that certain First
Amendment to Credit Agreement and Promissory Note dated March 31, 1994; (b) a
letter amendment concerning Permitted Investments dated December 31, 1994; (c) a
letter amendment concerning Consolidated Tangible Net Worth dated March 7, 1995;
(d) that certain Fourth Amendment to Credit Agreement and Promissory Note dated
June 9, 1995; and (e) that certain Fifth Amendment to Credit Agreement and
Promissory Note dated March 29, 1996.  (As so amended, such Credit Agreement is
herein called the "Original Agreement".)
<PAGE>
 
          6.  Aviva America intends to sell the Subject Properties to BWAB
Incorporated on the terms and conditions set forth in the Purchase and Sale
Agreement (the "Sale").

          7.  Borrower and Aviva America have asked Lender (i) to consent to the
Sale and (ii) to release its Liens against the Subject Properties, and Lender
has agreed to do so, provided that the Original Agreement and Original Note are
amended as set forth herein.

          NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original Agreement, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto do hereby agree as follows:


                                  ARTICLE I.

                          Definitions and References
                          --------------------------

          (S) 1.1  Terms Defined in the Original Agreement.  Unless the context
                   ---------------------------------------                     
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

          (S) 1.2.  Other Defined Terms.  Unless the context otherwise requires,
                    -------------------                                         
the following terms when used in this Amendment shall have the meanings assigned
to them in this (S) 1.2.

                 "Amendment" means this Sixth Amendment to Credit Agreement and
                  ---------                                                    
          Promissory Note.

                 "Credit Agreement" means the Original Agreement as heretofore
                  ----------------
          amended and as amended hereby.

                 "Note" means the Original Note as heretofore amended and as
                  ----
          amended hereby.


                                  ARTICLE II.

          Amendments to the Original Agreement and the Original Note
          ----------------------------------------------------------

          (S) 2.1.  Mandatory prepayments. Section 2.7 of the Original Agreement
                    ---------------------
is hereby amended by adding a new subsection (c) to read as follows:

                 "(c)  Borrower shall make a $2,800,000 prepayment on the
          principal of the Loan on the date which is the earlier of (i) the date
          on which Borrower receives the proceeds from the Sale or (ii) December
          31, 1996."

                                      -2-
<PAGE>
 
          (S) 2.2.  Regular Payments.  Section 2.8 of the Original Agreement is
                    ----------------                                           
hereby amended in its entirety to read as follows:

                 "Section 2.8  Regular Payments.  Beginning November 29, 1996
                               ----------------
          and continuing on the last Business Day of each calendar month
          thereafter, Borrower will, in addition to paying any interest then due
          on the Loan, repay the principal balance of the Loan in accordance
          with the following schedule:


<TABLE>
<CAPTION>

          Payment Dates                  Monthly Principal Payment
          -------------                  -------------------------
<S>                                      <C>

          November, 1996                         $ 120,000
          December, 1996                                 0
                                      
          January, 1997                          $  25,000
          February, 1997                            25,000
          March, 1997                               25,000
          April, 1997                               25,000
          May, 1997                                 25,000
          June, 1997                                25,000
          July, 1997                                25,000
          August, 1997                             521,000
          September, 1997                          521,000
          October, 1997                            521,000
          November, 1997                           521,000
          December, 1997                           521,000
                                      
          January, 1998                          $ 521,000
          February, 1998                           521,000
          March, 1998                              521,000
          April, 1998                              521,000
          May, 1998                                521,000
          June, 1998                               521,000
          July, 1998                               521,000
          August, 1998                             521,000
          September, 1998                          521,000
          October, 1998                            521,000"
</TABLE>

          (S) 2.3.  Amendments to Original Note. The sixth paragraph of the
                    ---------------------------
Original Note is hereby amended in its entirety to read as follows:

          "On October 31, 1998 the unpaid principal balance of this Note and all
          interest accrued hereon shall be due and payable in full."

                                      -3-
<PAGE>
 
                                 ARTICLE III.

                            Agreements and Consents
                            -----------------------

          (S) 3.1.  Limitations on Investments in Colombian Operations.
                    -------------------------------------------------- 

                 (a) During the Fiscal Year beginning January 1, 1997, the
          aggregate value of all Related Persons' expenditures for and
          investments in the development of Borrower's Colombian properties
          shall not exceed $2,165,000 (calculated on a accrual basis).

                 (b) During the Fiscal Year beginning January 1, 1997, the
          aggregate value of all Related Persons' expenditures for and
          investments in the exploration of Borrower's Colombian properties
          shall not exceed $1,780,000 (calculated on a accrual basis).

          (S) 3.2.  Consent re: Sale of Subject Properties. Lender hereby
                    --------------------------------------
consents to the Sale and agrees to waive any Default or Event of Default arising
therefrom under Section 5.2(e) of the Credit Agreement.

                                  ARTICLE IV.

                        Representations and Warranties
                        ------------------------------

          (S) 4.1.  Representations and Warranties of Borrower. In order to
                    ------------------------------------------
induce Lender to enter into this Amendment, each Obligor represents and warrants
to Lender that:

                 (a) The representations and warranties contained in Section 4.1
          of the Original Agreement are true and correct at and as of the time
          of the effectiveness hereof.

                 (b) Each Obligor is duly authorized to execute and deliver this
          Amendment and Borrower is and will continue to be duly authorized to
          borrow and to perform its obligations under the Credit Agreement. Each
          Obligor has duly taken all corporate action necessary to authorize the
          execution and delivery of this Amendment and to authorize the
          performance of the obligations of Borrower hereunder.

                 (c) The execution and delivery by each Obligor of this
          Amendment, the performance by each Obligor of its obligations
          hereunder and the consummation of the transactions contemplated hereby
          do not and will not conflict with any provision of law, statute, rule
          or regulation or of the articles or certificate, as appropriate, of
          incorporation and bylaws of each Obligor, or of any material
          agreement, judgment, license, order or permit applicable to or binding
          upon each Obligor, or result in the creation of any lien, charge or
          encumbrance upon any

                                      -4-
<PAGE>
 
          assets or properties of any Obligor. Except for those which have been
          duly obtained, no consent, approval, authorization or order of any
          court or governmental authority or third party is required in
          connection with the execution and delivery by each Obligor of this
          Amendment or to consummate the transactions contemplated hereby.

                 (d) When duly executed and delivered, each of this Amendment,
          the Note and the Credit Agreement will be a legal and binding
          instrument and agreement of each Obligor, enforceable in accordance
          with its terms, except as limited by bankruptcy, insolvency and
          similar laws applying to creditors' rights generally and by principles
          of equity applying to creditors' rights generally.

                 (e) The audited annual Consolidated financial statements of
          Aviva Petroleum dated as of December 31, 1995 fairly present its
          Consolidated financial position at such date and its Consolidated
          results of operations and Consolidated cash flows for the period
          ending on such date. Since December 31, 1995, no material adverse
          change has occurred in the financial condition or businesses or in the
          Consolidated financial condition or businesses of the Obligors.

                                  ARTICLE V.

                                 Miscellaneous
                                 -------------

          (S) 5.1.  Effective Date.  This Amendment shall become effective as of
                    --------------
the date first above written when and only when Lender shall have received, at
Lender's office:
 
          (i)   a counterpart of this Amendment executed and delivered by
Borrower; and

          (ii)  verification that the Sale has been consummated.

          (S) 5.2.  Ratification of Agreements. The Original Agreement and the
                    --------------------------
Original Note as hereby amended are hereby ratified and confirmed in all
respects. The Loan Documents, as they may be amended or affected by this
Amendment, are hereby ratified and confirmed in all respects. Any reference to
the Credit Agreement in any Loan Document shall be deemed to refer to this
Amendment also, and any reference in any Loan Document to the Note and any other
document or instrument amended, renewed, extended or otherwise affected by this
Amendment shall also refer to such document as amended hereby. Any reference to
the Note in any other Loan Document shall be deemed to be a reference to the
Original Note as amended by this Amendment. The execution, delivery and
effectiveness of this Amendment shall not, except as expressly provided herein,
operate as a waiver of any right, power or remedy of Lender under the Credit
Agreement or any other

                                      -5-
<PAGE>
 
Loan Document nor constitute a waiver of any provision of the Credit Agreement
or any other Loan Document.

          (S) 5.3.  Ratification of Security Documents. Each of the Obligors
                    ----------------------------------
hereby consents to the provisions of this Amendment and the transactions
contemplated herein (including without limitation the amendment to the Original
Note), and hereby ratifies and confirms each Loan Document executed and
delivered by it to and for the benefit of Lender, and each hereby agrees that
its respective obligations and covenants thereunder are unimpaired hereby and
shall remain in full force and effect.

          (S) 5.4.  Survival of Agreements.  All representations, warranties,
                    ----------------------                                   
covenants and agreements of each Obligor herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loan, and shall further survive until
all of the Obligations are paid in full.  All statements and agreements
contained in any certificate or instrument delivered by any Obligor hereunder or
under the Credit Agreement to Lender shall be deemed to constitute
representations and warranties by, or agreements and covenants of, such Obligor
under this Amendment and under the Credit Agreement.

          (S) 5.5.  Loan Documents.  This Amendment is a Loan Document, and all
                    --------------                                             
provisions in the Credit Agreement pertaining to Loan Documents apply hereto.

          (S) 5.6.   Governing Law.  This Amendment shall be governed by and
                     -------------                                          
construed in accordance with the laws of the State of New York and any
applicable laws of the United States of America in all respects, including
construction, validity and performance.

          (S) 5.7.  Counterparts.  This Amendment may be separately executed in
                    ------------                                               
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

              [the balance of this page intentionally left blank]


                                      -6-
<PAGE>
 
    IN WITNESS WHEREOF, this Amendment is executed as of the date first above
written.

                              AVIVA PETROLEUM INC.
                              NEO ENERGY, INC.
                              AVIVA AMERICA, INC.



                              By: /s/ James L. Busby
                                 --------------------------------
                                 James L. Busby
                                 Treasurer


                              ING (U.S) CAPITAL CORPORATION



                              By: /s/ Christopher R. Wagner
                                 --------------------------------
                                 Christopher R. Wagner
                                 Vice President


                                      -7-
<PAGE>
 
                             CONSENT AND AGREEMENT
                             ---------------------

     Aviva Operating Company, a Nevada corporation, hereby consents to (i) the
provisions of that certain Sixth Amendment to Credit Agreement and Promissory
Note (the "Amendment") made as of the 22nd day of November, 1996 by and between
Neo Energy, Inc., a Texas corporation, Aviva Petroleum Inc., a Texas
corporation, Aviva America, Inc., a Delaware corporation, and ING (U.S.) Capital
Corporation (formerly named Internationale Nederlanden (U.S.) Capital
Corporation), a Delaware corporation ("Lender") and (ii) the transactions
contemplated in the Amendment (including without limitation the amendment to the
Original Note), and hereby ratifies and confirms the Guaranty (the "Guaranty")
dated as of August 6, 1993 made by it for the benefit of Internationale
Nederlanden Bank N.V., New York Branch (which has since assigned all its rights,
interests, and obligations under the Guaranty to Lender), and agrees that its
obligations and covenants under the Guaranty are unimpaired by the Amendment and
shall remain in full force and effect.


                              AVIVA OPERATING COMPANY



                              By: /s/ James L. Busby
                                 -------------------------------- 
                                  James L. Busby
                                  Treasurer


                                      -8-

<PAGE>
                                                                   EXHIBIT 10.58
 
                          PURCHASE AND SALE AGREEMENT

This Purchase and Sale Agreement (this "Agreement") is made and entered into on
this the  22nd day of November, 1996, between AVIVA AMERICA, INC., a Delaware
corporation (Seller), and BWAB Incorporated, a Colorado corporation and/or its
permitted affiliates (Buyer).

1.   SALE AND PURCHASE OF THE PROPERTIES.   Subject to the terms and conditions
herein set forth, Seller agrees to sell, assign, convey and deliver to Buyer and
Buyer agrees to purchase and acquire from Seller at the Closing, but effective
as of 7:00 a.m. on October 1, 1996 (the Effective Date), the Properties.  The
term "Properties" shall mean:

          (a) All of Seller's right, title and interest in the oil and gas
     leases described in Exhibit B (the "Leases") and in the wells described in
                         ---------
     Exhibit A (the "Wells");
     ---------

          (b) All of Seller's right, title and interest in all wells, equipment,
     fixtures, production facilities, personal property and improvements
     (including, without limitation, materials, plants, pipelines, gathering and
     processing systems and salt water disposal systems) which are located on,
     appurtenant to or used in connection with the Leases and Wells now, as of
     the Effective Time or as of the Closing Date (the "Equipment");

          (c) All of Seller's right, title and interests in all contracts,
     instruments, payout balances, commitments, licenses, servitudes, permits,
     easements, rights-of-way and other rights of Seller relating to the items
     described in this Paragraph 1, together with all of Seller's rights, claims
     and causes of action under such items arising after the Effective Time (the
     "Contracts"), but specifically excluding all of Seller's rights, claims and
     causes of action under such items arising before the Effective Time,
     including, but not, limited to Seller's rights under the Williams Gas
     Contract Settlement (as described in the Offering Memorandum provided by
     Seller to Buyer);

          (d) All of Seller's right, title and interest in oil, gas, condensate,
     related hydrocarbons and other minerals produced from the Leases after the
     Effective Time (the "Substances"):

          (e) All accounts, instruments, general intangibles, liens and security
     interests arising from the sale or other disposition of the items described
     in this Paragraph 1 on or after the Effective Time (the "Accounts"); and

          (f) All of Seller's information relating to the Leases and the Wells,
     including geological, engineering, and proprietary geophysical and seismic
     data (both "2-D" and "3-D"), navigation tapes, logs, core analysis,
     formation tests, production records, land, title, accounting and contract
     files; but excluding materials which are subject to confidentiality
     agreements with third parties that prohibit sale or disclosure.

                                       1
<PAGE>
 
2.   PURCHASE PRICE.   The purchase price for the Properties shall be $3,000,000
(the "Purchase Price"), subject to any applicable adjustments as are hereinafter
provided.

3.   DEPOSIT.  Contemporaneously with the execution of this Agreement, Buyer
will deposit into an escrow account (to be established at a mutually acceptable
bank with assets in excess of $100 million), an amount equal to ten percent
(10%) of the Purchase Price (hereinafter called the "Deposit").  Buyer and
Seller agree that the escrow instructions shall specify that if Buyer and Seller
close the transaction contemplated by this Agreement, the Deposit shall be
applied to the Purchase Price and the amount due from Buyer at Closing will be
reduced, in addition to any other deductions provided for herein, by the amount
of the Deposit.  The Deposit shall be refunded to Buyer in the event that this
Agreement is terminated (a) because Buyer's conditions to Closing set out in
Paragraph 9 hereof are not satisfied and Buyer is not then in default under this
- -----------                                                                     
Agreement or (b) pursuant to the provisions of Sections 8.3, 9.3, 17 or 19.6(d)
                                               ------------  ---  --    -------
hereof.  Otherwise, should Buyer fail or refuse to consummate the purchase of
the Properties hereunder, Seller shall be entitled to retain the Deposit as
liquidated damages as its sole and exclusive remedy (it being agreed that
damages in such event would be extremely difficult to determine and that the
Deposit represents a fair and reasonable estimate of damages under such
circumstances and does not constitute a penalty).  In the event that this
Agreement is terminated under conditions which entitle Buyer to a return of the
Deposit, the Deposit shall be returned to Buyer within ten (10) days of such
termination.

4.   ADJUSTMENTS TO PURCHASE PRICE; FINAL PURCHASE PRICE.  The Purchase Price
shall be adjusted as follows and the resulting amount shall be referred to
herein as the Final Purchase Price:

     4.1  INCREASES IN PURCHASE PRICE.  The Purchase Price shall be increased
by an amount equal to the sum of the following amounts:

          4.1.1 The amount of costs and expenses, including, without limitation,
     such capital expenditures as are permitted by Section 7.1.1. below incurred
                                                   --------------
     by Seller in the ordinary course of Seller's business and customary
     overhead charges related to the Properties from the Effective Date to the
     Closing Date; provided, however, Seller has agreed to bear and pay all
     costs associated with the workover of the Miami Corp. A-3 Well in Cameron
     Parish, Louisiana and such costs shall not result in an adjustment to the
     Purchase Price under this Section 4.1.
                               ----------- 

          4.1.2 The amount of all prepaid expenses, including, without
     limitation. ad valorem, property and similar taxes and assessments based
     upon or measured by ownership of the Properties and attributable to periods
     of time after the Effective Date.

          4.1.3 In the event that there is a cumulative net underproduction
     imbalance attributable to Seller's working interest in the Properties as of
     the Effective Date, an amount equal to the product of (a) the Imbalance
     Unit Value (as hereinafter defined) and (b) the volume (stated in Mcf's) of
     such cumulative net underproduction imbalance attributable to Seller's
     working interest in the Properties as of the Effective Date. The "Imbalance
     Unit Value" shall mean a per Mcf value for imbalances to be agreed upon
     between Seller and

                                       2
<PAGE>
 
     Buyer prior to Closing (or determined pursuant to Paragraph 33 hereof if
                                                       ------------
     Seller and Buyer are unable to reach an agreement).

          4.1.4 As to Wells in which Seller's Net Revenue Interest (as defined
     in Section 10 below) is determined to be greater than the decimal interest
        ----------
     noted in Exhibit A, an amount determined by multiplying the Allocated Value
              ---------
     (as hereinafter defined) for Seller's interest in the Well in question by a
     fraction, the numerator of which shall be the decimal increase in Seller's
     Net Revenue Interest in such Well from the interest shown for such Well in
     Exhibit A and the denominator of which shall be the Net Revenue Interest
     ---------
     shown for such Well on such Exhibit.
 
          4.1.5 The value of all merchantable oil and other products in tanks
     above the pipeline sales connection at the Effective Date that is credited
     to the Properties, such value to be the market or, if applicable, the
     contract price in effect as of the Effective Date, less any applicable
     severance taxes and royalties.
 
     4.2  DECREASES IN PURCHASE PRICE.  The Purchase Price shall be decreased by
an amount equal to the sum of the following amounts:
 
          4.2.1 The amount of all proceeds received by Seller, net of all
     applicable taxes and royalties attributable to production from the
     Properties for periods of time after the Effective Date.
 
          4.2.2 In the event that there is a cumulative net overproduction
     imbalance attributable to Seller's working interest in the Properties as of
     the Effective Date, an amount equal to the product of (a) the Imbalance
     Unit Value and (b) the volume (stated in Mcf's) of such cumulative net
     overproduction imbalance attributable to Seller's working interest in the
     Properties as of the Effective Date.

          4.2.3 An amount equal to all ad valorem, property, and similar taxes
     and assessments based upon or measured by Seller's ownership of the
     Properties that are unpaid as of the Closing Date and attributable to
     periods of time prior to the Effective Date (for which Buyer agrees to
     assume liability hereunder), which amounts shall be computed based upon
     such taxes and assessments for the calendar year 1996; provided that if
     such taxes or assessments are assessed on other than a calendar year basis,
     for the tax related year last ended.

          4.2.4 Any amount determined in connection with uncured Title Defects
     as provided for in Section 10.4 below.
                        ------------       

          4.2.5  Any amount determined in connection with any Casualty Loss as
     provided for in Section 17 below.
                     ----------       

                                       3
<PAGE>
 
          4.2.6  Any amount determined in connection with Adverse Environmental
     Conditions as provided for in Section 19.6(b) and/or (c) below.
                                   ---------------        ---

          4.2.7  Any amount determined in connection with an Accounting Defect
     as provided for in Section 10.8 below.
                        ------------       

     4.3.  GAS IMBALANCES.  The adjustments to be made to the Purchase Price at
Closing based upon the net cumulative gas imbalances attributable to Seller's
working interest in the Properties shall be made based upon the gas imbalance
schedule attached hereto as Schedule 4.3.  Buyer and Seller shall have a period
                            ------------                                       
of six (6) months following the date of Closing to verify the accuracy of
Schedule 4.3.  Buyer and Seller agree to cooperate with each other following
- ------------                                                                
Closing to determine the accuracy of Schedule 4.3 and to determine what
                                     ------------                      
adjustments, if any,  are required to make to Schedule 4.3 in order to make
                                              ------------                 
Schedule 4.3 accurate.   Within ten (10) days following the end of such six (6)
- ------------                                                                   
month time period, Buyer shall deliver to Seller a written statement (Buyer's
Gas Balancing Statement) setting out any adjustments Buyer proposes to be made
to Schedule 4.3 along with such supporting documentation as may be required to
   ------------                                                               
verify any changes Buyer is proposing be made. Within five (5) days of Seller's
receipt of Buyer's Gas Balancing Statement, Seller shall advise Buyer in writing
whether Seller agrees with Buyer's Gas Balancing Statement and, if not, what
changes Seller proposes be made to Buyer's Gas Balancing Statement.  The parties
shall thereafter undertake to agree with respect to the adjustments, if any,
which are required to be made to Schedule 4.3 at the earliest practical date.
                                 ------------                                
Any final amounts owed by either party to the other as a result of any changes
to Schedule 4.3 shall be paid in immediately available funds within five (5)
   ------------                                                             
days of the date the parties reach a final agreement with respect to Schedule
                                                                     --------
4.3.
- --- 
 
5.   REPRESENTATIONS AND WARRANTIES OF SELLER.   Seller represents and warrants
to Buyer that:

     5.1  ORGANIZATION. Seller is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and is
qualified to do business in and in good standing under the laws of the state(s)
where the Properties are located.
 
     5.2  AUTHORITY.  Seller has full power and authority and has taken all
requisite action, corporate or otherwise, to authorize it to carry on its
business as currently conducted, to enter into this Agreement and to perform its
obligations under this Agreement.
 
     5.3  ENFORCEABILITY.  This Agreement has been duly executed and delivered
on behalf of Seller and constitutes the legal, valid and binding obligation of
Seller enforceable in accordance with its terms. At the Closing, all documents
required hereunder to be executed and delivered by Seller shall be duly
authorized, executed and delivered and shall constitute legal, valid and binding
obligations of Seller enforceable in accordance with their respective terms.
 
     5.4  CONTRACTS.  All material leases, operating agreements, production
sales contracts, farmout agreements and other material contracts or agreements
respecting the Properties can be found either of record in the counties in which
the Properties are located or are reflected or referenced in Seller's files.

                                       4
<PAGE>
 
     5.5   PREFERENTIAL PURCHASE RIGHTS/CONSENTS.  Schedule 5.5 sets forth all
                                                   ------------               
consents and approvals required to be obtained for, and all preferential
purchase rights exercisable in connection with, the assignment of the Properties
to Buyer, except for those constituting Permitted Encumbrances.
 
     5.6   LITIGATION AND CLAIMS.  Except as set forth in Schedule 5.6, no
                                                          ------------
claim, filing, cause of action, administrative proceeding, lawsuit or other
litigation is pending or threatened in writing that could reasonably be expected
to now or hereafter materially and adversely affect Buyer's ownership, operation
or value of any of the Properties.

     5.7   NO MATERIAL DEFAULT.  Seller is not in material default under any of
the contracts or agreements referred to in Section 5.4.

     5.8   PROPERTY OBLIGATIONS.  To the best of Seller's knowledge, all
rentals, royalties, shut-in royalties, overriding royalties and other payments
due pursuant to ro with respect to the Leases have been properly paid.

     5.9   PROPERTY OPERATION.  To the best of Seller's knowledge: (i) the
Properties have been drilled, completed, operated, developed and produced in
material compliance with all applicable judgments, orders, laws, rules and
regulations; and (ii) all necessary certificates, consents, permits, licenses
and other governmental authorizations affecting the Properties have been
obtained and are in force.

     5.10  TAKE-OR PAY.  Seller is not obligated, under a take-or-pay or similar
arrangement, or by virtue of an election to non-consent, or not participate in a
past or current operation on the Properties pursuant to the applicable operating
agreements, to produce hydrocarbons, or allow hydrocarbons to be produced,
without receiving full payment at the time of delivery in an amount that
corresponds to the net revenue interest in the hydrocarbons described on
Exhibit A.
- --------- 

     5.11  TAXES.  All taxes based on or measured by the ownership of property,
the production or removal of hydrocarbons and the receipt of proceeds which are
due and relating to the Properties have been properly paid, subject to possible
adjustment for volume or price corrections.

     5.12  TIMELY PAYMENT.  Seller is timely receiving its share of proceeds
from the sale of hydrocarbons produced from the Properties without suspense,
counterclaim or set-off, except for immaterial amounts. To the best of Seller's
knowledge, there has been no production of hydrocarbons from the Properties in
excess of the allowable production established pursuant to applicable state or
federal law or regulation that would result in a restriction on production from
the Leases subsequent to the Effective Time.

     5.13  PROPERTY CONDITION.  To the best of Seller's knowledge, there has
been no material adverse change in the condition of any of the Properties or
Equipment after the Effective Date except depletion through normal production
within authorized allowables, changes in rates of production that 

                                       5
<PAGE>
 
occur in the ordinary course of operation and depreciation of Equipment through
ordinary wear and tear.

     5.14  BROKERS' FEES.  Seller has incurred no liability for brokers' fees or
finders' fees, including the fees of Wellspring Partners, related to the
transactions contemplated by this Agreement for which Buyer shall be liable.

     5.15  OUTSTANDING OBLIGATIONS.  Except as otherwise described in Schedule
                                                                      --------
5.15 hereof, to the best of Seller's knowledge there are no outstanding
- ----                                                                   
authorizations for expenditures or any written commitments or proposals to
conduct operations on the Properties which are required to be approved by non-
operators under the terms of the applicable operating agreement.

     5.16  COMPLIANCE.  To the best of Seller's knowledge, the Properties have
been operated in material compliance with all applicable laws, regulations,
orders, judgments, licenses and permits concerning the prevention, abatement or
elimination of pollution and the protection of the environment and there is no
circumstance which could reasonably be expected to (i) materially interfere with
continued compliance, (ii) give rise to material liability, (iii) form the basis
for any material claim, suit, relief or investigation, or (iv) require a
material change in the present condition or operation of the Properties.

6.   REPRESENTATIONS AND WARRANTIES OF BUYER.   Buyer represents and warrants to
Seller that:

     6.1  ORGANIZATION.  Buyer is a corporation duly organized, validly existing
and in good standing under the laws of the State of Colorado and is qualified
(or will be qualified at the time of Closing) to do business in and in good
standing under the laws of the state(s) where the Properties are located.

     6.2  AUTHORITY.  Buyer has full power and authority and has taken all
requisite action, corporate or otherwise, to enter into this Agreement, to
purchase the Properties on the terms described in this Agreement and to perform
its other obligations under this Agreement.

     6.3  ENFORCEABILITY.  This Agreement has been duly executed and delivered
on behalf of Buyer, and constitutes the legal, valid and binding obligation of
Buyer enforceable in accordance with its terms. At the Closing, all documents
required hereunder to be executed and delivered by Buyer shall be duly
authorized, executed and delivered and shall constitute legal, valid and binding
obligations of Buyer enforceable in accordance with their respective terms.

     6.4  DUE DILIGENCE.  Buyer represents that it has performed, or will
perform before Closing, necessary evaluations and assessments relating to the
Properties to enable it to make an independent determination with respect to its
acquisition of the Properties under the terms of this Agreement.

     6.5  INVESTMENT INTENT.  Buyer is a knowledgeable purchaser, owner, and
operator of oil and gas properties, has the ability to evaluate (and in fact has
evaluated) the Properties for purchase 

                                       6
<PAGE>
 
and is acquiring the Properties for its own account and not with the intent to
make a distribution thereof in violation of the Securities Act of 1933 as
amended (and the rules and regulations pertaining thereto), or in violation of
any other applicable securities laws.

     6.6  FUNDS AVAILABLE.  Buyer has, or will have (based upon its current
creditworthiness) prior to the Closing Date, sufficient cash, available lines of
credit or other sources of immediately available funds to enable it to make
payment of the Purchase Price.

     6.7  BROKERS FEES.  Buyer has incurred no liability for brokers' fees or
finders' fees related to the transactions contemplated by this Agreement for
which Seller shall be liable.

7.   COVENANTS OF SELLER.

     7.1  CONDUCT OF BUSINESS PENDING CLOSING.  Seller covenants that from the
date hereof to the Closing Date, except (a) as provided herein, (b) as required
by any existing obligation, agreement, lease, contract, or instrument to which
the Properties are subject, or (c) as otherwise consented to in writing by
Buyer, Seller will:
 
          7.1.1 Not (a) act in any manner with respect to the Properties other
     than in the normal, usual and customary manner, consistent with prior
     practice; (b) dispose of, encumber or relinquish any of the Properties
     (other than relinquishments resulting from the expiration of leases that
     Seller has no contractual right or option to renew); (c) waive, compromise
     or settle any material right or claim with respect to any of the
     Properties; or (d) conduct capital or workover projects with respect to the
     Properties in excess of $10,000.00, except when required by an emergency
     when there shall have been insufficient time to obtain advance consent.

          7.1.2  Use its best efforts to preserve relationships with all third
     parties having business dealings with respect to the Properties.

          7.1.3  Cooperate with Buyer in connection with any required
     notification of applicable governmental regulatory authorities of the
     transactions contemplated hereby and cooperate with Buyer in obtaining the
     issuance by each such authority of such permits, licenses and
     authorizations as may be necessary for Buyer to own and operate the
     Properties following the consummation of the transactions contemplated by
     this Agreement.

          7.1.4  Notify Buyer of the discovery by Seller that any Representation
     or Warranty of Seller contained in this Agreement is or becomes materially
     untrue or will be materially untrue on the Closing Date.

     7.2  ACCESS.  Seller shall afford to Buyer and its authorized
representatives reasonable access, at Buyer's sole risk and expense, from the
date hereof until the Closing Date during normal business hours, to (a) the
Properties operated by Seller, provided, however, that Buyer shall indemnify and
hold harmless Seller and its co-owners, and their respective officers, directors
and 

                                       7
<PAGE>
 
employees from and against any and all losses, costs, damages, obligations,
claims, liabilities, expenses and causes of action arising from Buyer's
inspection of the Properties. including, without limitation, claims for personal
injuries, property damage and reasonable attorneys' fees, and (b) Seller's
operating, accounting, contract, legal files, and records, regarding the
Properties ("Data"); provided, however, that Data shall not include (a) any
attorney work product or attorney client communications which Seller reasonably
believes to be privileged or  (b) information, the disclosure of which would
violate any confidentiality agreement to which Seller is bound; provided that
Seller agrees to disclose sufficient information about any such confidentiality
agreements to enable Buyer to request waivers of the same to enable it to
conduct its due diligence reviews.  Until Closing, Buyer shall exercise
reasonable care in safeguarding and maintaining the confidentiality of all data
or information regarding the Properties provided by Seller to Buyer.  In the
event this Agreement is terminated prior to Closing, Buyer will immediately
return to Seller all copies of such data or information and shall continue to
maintain the confidentiality of all information regarding the Properties
provided by Seller to Buyer for a period of twelve (12) months from the date of
such termination.

     7.3  CONSENTS; APPROVALS.  Seller will cooperate with Buyer and take all
action reasonably necessary to attempt to obtain all permissions, approvals and
consents as may be required to consummate the transactions contemplated in this
Agreement, including, but not limited to, obtaining waivers of any required
consents to transfer and preferential rights to purchase set out in Schedule 5.5
                                                                    ------------
hereto.

8.   CONDITIONS PRECEDENT TO THE OBLIGATIONS OF SELLER.  The obligations of
Seller to be performed at Closing are subject to the fulfillment (or waiver by
Seller in its sole discretion) before or at Closing, of each of the following
conditions:

     8.1  REPRESENTATIONS AND WARRANTIES.   The Representations and Warranties
by Buyer set forth in this Agreement shall be true and correct in all material
respects at and as of the Closing as though made at and as of the Closing; and
Buyer shall have performed and complied with, in all material respects, all
covenants and agreements required to be performed and satisfied by Buyer at or
prior to the Closing.

     8.2  NO LITIGATION.   No suit, action or other proceedings shall, on the
date of Closing, be pending or threatened before any court or governmental
agency seeking to restrain, prohibit, or obtain substantial damages or other
material adverse relief in connection with the consummation of the transactions
contemplated by this Agreement.

     8.3  TITLE DEFECTS/ACCOUNTING DEFECTS/CASUALTY LOSSES/ADVERSE ENVIRONMENTAL
CONDITIONS.  The total of the Purchase Price reductions (if any) which result
from the application of Section 10.4, Section 10.8, Section 17 or Section 19.6
                        ------------  ------------  ----------    ------------
hereof do not exceed ten percent (10%) of the Purchase Price.

                                       8
<PAGE>
 
     If any such condition to the obligations of Seller to be performed at
Closing under this Agreement is not met as of the Closing Date, this Agreement
may, at the option of Seller, be terminated.

9.   CONDITIONS PRECEDENT TO THE OBLIGATIONS OF BUYER. The obligations of Buyer
to be performed at Closing are subject to the fulfillment (or waiver by Buyer in
its sole discretion) before or at Closing, of each of the following conditions:

     9.1  REPRESENTATIONS AND WARRANTIES.   The Representations and Warranties
by Seller set forth in this Agreement shall be true and correct in all material
respects at and as of the Closing as though made at and as of the Closing; and
Seller shall have performed and complied with, in all material respects, all
covenants and agreements required to be performed and satisfied by Seller at or
prior to the Closing.

     9.2  NO LITIGATION.   No suit, action or other proceedings shall, on the
date of Closing, be pending or threatened before any court or governmental
agency seeking to restrain, prohibit, or obtain substantial damages or other
material adverse relief in connection with the consummation of the transactions
contemplated by this Agreement.

     9.3  TITLE DEFECTS/ACCOUNTING DEFECTS/CASUALTY LOSSES/ADVERSE ENVIRONMENTAL
CONDITIONS.  The total of the Purchase Price reductions (if any) which result
from the application of Section 10.4, Section 10.8,  Section 17 or Section 19.6
                        ------------  ------------   ----------    ------------
hereof do not exceed ten percent (10%) of the Purchase Price.

     If any such condition to the obligations of Buyer under this Agreement is
not met as of the Closing Date, this Agreement may, at the option of Buyer, be
terminated.

10.  TITLE MATTERS/ACCOUNTING DEFECTS.

     10.1 CERTAIN DEFINED TERMS.   As used in this Agreement, the following
terms have the following meanings:

          10.1.1 "Good and Defensible Title" means such title to the Properties
     that (a) entitles Seller to receive not less than the Net Revenue Interests
     in all oil, gas, condensate and related hydrocarbons produced from the
     Wells described in Exhibit A, and (b) obligates Seller to bear not more
                        ---------
     than the Working Interests in the Wells as set forth in Exhibit A (unless
                                                             ---------
     there is a corresponding increase in the Net Revenue Interests) and (ii) is
     free and clear of all liens and encumbrances, except for Permitted
     Encumbrances.

          10.1.2 "Title Defect" shall mean, with respect to Seller's title to
     the Properties, any lien, mortgage, claim, charge, defect, or other
     encumbrance which renders Seller's title to such Properties less than Good
     and Defensible Title.

                                       9
<PAGE>
 
          10.1.3 "Net Revenue Interest" shall mean Seller's interest in and to
     all production of oil, gas and other minerals saved, produced and sold from
     any Well after giving effect to all valid lessor's royalties, overriding
     royalties, production payments, carried interests, and other burdens on
     production therefrom.

          10.1.4 "Working Interest" shall mean, with respect to the Wells,
     Seller's share of the cost of exploring, drilling, developing and operating
     the Wells, and producing oil, gas and other minerals.

          10.1.5 "Permitted Encumbrances" shall mean:

                 (a) Lessors' royalties, overriding royalties, reversionary
          interests and similar burdens if the net cumulative effect of the
          burdens does not operate to reduce Seller's Net Revenue Interest in a
          Well to less than the Net Revenue Interest for such Well set forth in
          Exhibit A or operate to increase Seller's Working Interest in such
          ---------                                
          Well to more than the Working Interest for such Well set forth in
          Exhibit A;
          --------- 

                 (b) Division orders and sales contracts terminable without
          penalty upon no more than 90 days notice to the purchaser;

                 (c) Preferential rights to purchase and required third party
          consents to assignment and similar agreements with respect to which
          waivers or consents are obtained from the appropriate parties, or the
          appropriate time period for asserting any such right has expired
          without an exercise of the right;

                 (d) Materialman's, mechanic's, repairman's, employee's,
          contractor's, operator's, tax, and other similar liens or charges
          arising in the ordinary course of business for obligations that are
          not delinquent or that will be paid and discharged in the ordinary
          course of business or if delinquent, that are being contested in good
          faith by appropriate action of which Buyer is notified in writing
          before Closing;

                 (e) All rights to consent by, required notices to, filings
          with, or other actions by governmental entities in connection with the
          sale or conveyance of oil and gas leases or interests therein if they
          are routinely obtained subsequent to the sale or conveyance;

                 (f) Easements, rights-of-way, servitudes, permits, surface
          leases and other rights in respect of surface operations that do not
          materially interfere with the oil and gas operations to be conducted
          on any Well or Lease;

                 (g) All operating agreements, unit agreements, unit operating
          agreements, pooling agreements and pooling designations affecting the
          Properties that are either of record in Seller's chain of title or
          reflected or referenced in Seller's files and which do not reduce the
          interest of Seller with respect to oil and gas produced from any 

                                       10
<PAGE>
 
          Well below the Net Revenue Interest set forth in Exhibit "A" for such
          Well; or increase Seller's Working Interest in such Well to more than
          the Working Interest set forth in Exhibit "A" for such Well (unless
          there is a corresponding increase in the Net Revenue Interest);

                 (h) Conventional rights of reassignment prior to release or
          surrender requiring notice to the holders of the rights;

                 (i) All rights reserved to or vested in any governmental,
          statutory or public authority to control or regulate any of the
          Properties in any manner, and all applicable laws, rules and orders of
          governmental authority;

                 (j) The terms and conditions of the Leases, and of all
          agreements that are of record in Seller's chain of title or reflected
          or referenced in Seller's files.

                 (k) All other liens, charges, encumbrances, contracts,
          agreements, instruments, obligations, defects and irregularities
          affecting the Properties which individually or in the aggregate are
          not such as to interfere materially with the operation, value or use
          of any of the Properties, do not prevent Buyer from receiving the
          proceeds of production from any of the Wells, do not reduce the
          interest of Seller with respect to all oil and gas produced from any
          Well below the Net Revenue Interest set forth in Exhibit A for such
                                                           ----------
          Well or increase Seller's Working Interest in any such Well to more
          than the Working Interest set forth in Exhibit A for such well; and
                                                 ---------                   

                 (l) Any Title Defects Buyer may have expressly waived in
          writing or which are deemed to have become Permitted Encumbrances
          under Section 10.2.
                ------------- 

          10.1.6 "Defect Property" shall mean any Property which is subject to a
     Title Defect.

          10.1.7 "Defect Value" shall mean the amount by which the Allocated
     Value of any Well is reduced as a result of a Title Defect.

          10.1.8 The "Allocated Value" of a Well shall be determined first by
     reference to the portion of the Purchase Price which is allocated to 
     the Properties in the State in which said Well is located as set out in
     Exhibit C hereto, and second, by the relative value of said Well in
     ---------
     relation to the aggregate value of all Wells located in said State, as
     determined reservoir engineering reports.

          10.1.9 "Required Consent" means any approvals, consents or waiver of
     preferential rights to purchase, other than Permitted Encumbrances,
     required to be obtained in connection with the conveyance of the Properties
     to Buyer at Closing.

                                       11
<PAGE>
 
          10.1.10  An "Accounting Defect" shall be deemed to have occurred if
     Seller's joint interest billings and/or revenue check details for the
     Properties for the twelve (12) months prior to the Effective Date or any
     gas contracts or processing agreements covering the Properties reflect that
     the actual costs of operating the Properties or the revenues generated from
     the sale of oil or gas from the Properties are different in any material
     respect from those set out in the reserve report delivered by Seller to
     Buyer, and such differences, if incorporated in the reserve report would
     result in reducing the future net revenues from the Properties.

     10.2 NOTICE OF TITLE DEFECTS.  In the event that Buyer shall identify any
Title Defect, as soon as possible after discovery, but in no event later than
ten (10) days prior to the Closing Date, Buyer shall notify Seller in writing of
any Title Defect.  Buyer's notice (a "Defect Notice") shall include (i) a
description of the Property affected by the Title Defect; (ii) a reasonably
adequate explanation of the basis for the Title Defect; and (iii) the amount by
which Buyer believes the value of the affected Property has been reduced by the
Title Defect.  Buyer's failure to give notice of a Title Defect within the time
required by this Section 10.2 shall be a waiver by Buyer of such Title Defect
                 ------------                                                
and such Title Defect shall be treated as a Permitted Encumbrance.

     10.3 REMEDIES FOR TITLE DEFECT.  Upon notice of a Title Defect, Seller
shall have the right, but not the obligation, until Closing, to cure the Title
Defect.  If Seller is unable or elects not to cure the Title Defect prior to
Closing, the Purchase Price shall be reduced pursuant to Section 10.4.

     10.4 VALUE OF TITLE DEFECTS.  If Seller is unable or elects not to cure a
Title Defect prior to Closing, the parties shall promptly meet and negotiate in
good faith to reach an agreement as to the value of each such Title Defect.  If
the parties reach an agreement as to the value of a Title Defect, then the
amount agreed upon shall be the Defect Value for such Title Defect.  If the
parties' negotiations fail to result in an agreement as to the value of any
Title Defect prior to Closing (or thereafter as the parties may agree), then the
question as to the value of the Title Defect shall be submitted to arbitration
in accordance with Section 33 of this Agreement; provided, however, that for
                   ----------                                               
purposes of Closing and Sections 8.3 and 9.3 hereof, an  amount equal to the
                        ------------     ---                                
average of Seller's and Buyer's estimate of the value of the Title Defect shall
apply unless Seller has failed to provide an estimate, in which event Buyer's
estimate of the value of the Title Defect shall apply; provided further, that
the value of a Title Defect affecting a Well shall never be in excess of the
Allocated Value of such Well.  Accordingly, at Closing the Purchase Price shall
be adjusted based on an estimate (determined as aforesaid) and the difference
between the estimated value of such Title Defect used for Closing and the final
value of the Title Defect, as decided by arbitration, shall be a post-Closing
adjustment item to be made pursuant to Section 13.1 hereof.
                                       ------------        

     10.5 CONVEYANCE OF DEFECT PROPERTIES.  If, at Closing, Title Defects with
respect to any Defect Properties have not been corrected by Seller or waived by
Buyer, then subject to the provisions of Sections 8.3 and 9.3 hereof, the
                                         ------------     ---            
Purchase Price shall be reduced by the value of such Title Defects and Seller
shall convey to Buyer those Defect Properties subject to partial title failures,
but Seller shall not be obligated to convey to Buyer any Defect Properties with
respect to which there has been complete title failure.

                                       12
<PAGE>
 
     10.6  ADDITIONAL DEFECT PROPERTIES.  If any Required Consent is not
obtained prior to Closing, Buyer may elect to treat that portion of the
Properties subject to such Required Consent as a Defect Property by giving
Seller notice thereof in accordance with the provisions of Section 10.2.
                                                           ------------ 

     10.7  NOTICE OF ACCOUNTING DEFECTS.  In the event that Buyer shall identify
any Accounting Defects, as soon as possible after discovery, but in no event
later than ten (10) days prior to the Closing Date, Buyer shall notify Seller in
writing of any Accounting Defect.  Buyer's notice shall include (i) a
description of the costs or revenues which Buyer believes were not properly
reflected in the reserve report, (ii) a reasonably adequate explanation of the
basis for the Accounting Defect, and (iii) the amount by which Buyer believes
the value of the Properties have been reduced by the Accounting Defect.  Buyer's
failure to give notice of an Accounting Defect within the time required by this
Section 10.7 shall be a waiver by Buyer of such Accounting Defect.
- ------------                                                      

     10.8  VALUE OF ACCOUNTING DEFECT.  The parties shall promptly meet and
negotiate in good faith to reach an agreement as to the value of each Accounting
Defect.  If the parties reach an agreement as to the value of an Accounting
Defect, then the Purchase Price shall be reduced by the amount agreed upon.  If
the parties negotiations fail to result in an agreement as to the value of any
Accounting Defect prior to Closing (or thereafter as the parties may agree),
then the value of the Accounting Defect shall be submitted to arbitration in
accordance with Section 33 of this Agreement; provided, however, that for
                ----------                                               
purposes of Closing and Sections 8.3 and 9.3 hereof, an amount equal to the
                        ------------     ---                               
average of Seller's and Buyer's estimate of the value of the Accounting Defect
shall apply unless Seller has failed to provide an estimate, in which event
Buyer's estimate of the value of the Accounting Defect shall apply.
Accordingly, at Closing the Purchase Price shall be adjusted based on an
estimate (determined as aforesaid) and the difference between the estimated
value of such Accounting Defect used for Closing and the final value of the
Accounting Defect, as decided by arbitration, shall be a post-Closing adjustment
item to be made pursuant of Section 13.1 hereof.
                            ------------        

11.  SUSPENSE FUNDS HELD BY SELLER.   Seller agrees to convey and Buyer agrees
to receive all suspense funds held by Seller as of the Effective Date for the
benefit of royalty, overriding royalty interest and working interest owners
attributable to the Properties, the amount of such funds to be adjusted with
respect to suspense funds received and disbursed by Seller from and after the
Effective Date, and Buyer shall assume all past, present and future liability
associated with such funds, but only as to the suspense funds actually
transferred, and not to any liability resulting from Seller's failure to pay or
retain any amounts prior to the Effective Date. All past, present and future
liability associated with such funds shall be assumed by Buyer and Buyer agrees
to protect, defend, indemnify and hold Seller and its employees harmless from
and against any and all costs, expenses, claims, demands, and causes of action
of every kind and character (including attorneys' fees and court costs) arising
out of, incident to, or in connection therewith.

12.  CLOSING.

     12.1  THE CLOSING.  The sale and purchase of the Properties pursuant to
this Agreement shall be consummated (the "Closing") in the offices of Seller on
or before December 23, 1996 (the "Closing Date").

                                       13
<PAGE>
 
12.2  CLOSING OBLIGATIONS.  At the Closing, the following events shall occur:
 
          12.2.1 Seller shall execute and deliver to Buyer one or more
      instruments of assignment, in substantially the form of the Assignment,
      Bill of Sale and Conveyance set forth as Exhibit D hereto.
                                               ---------        

          12.2.2 Buyer shall deliver to Seller in immediately available funds
      (wire transfer), the Preliminary Amount. The "Preliminary Amount" shall be
      that amount to be determined by Seller prior to the Closing Date as an
      estimate of the final computation of the Final Purchase Price. Seller
      shall provide Buyer a closing statement reflecting the Preliminary Amount
      at least two (2) business days prior to the Closing.

          12.2.3 Seller and Buyer shall execute, acknowledge and deliver
      division orders, transfer orders or letters in lieu thereof directing all
      purchasers of production from the Properties to make payment of proceeds
      attributable to such production occurring on or after the Effective Date
      to Buyer.

          12.2.4 Seller shall deliver to the Buyer possession of the Properties
      at the Closing.

13.   POST-CLOSING ADJUSTMENTS.

      13.1  FINAL SETTLEMENT STATEMENT. After the Closing Date, Seller shall
prepare, in accordance with this Agreement and with generally accepted
accounting principles consistently applied, a Final Settlement Statement, a copy
of which shall be delivered by Seller to Buyer no later than ninety (90) days
after the Closing Date. The "Final Settlement Statement" shall set forth each
adjustment to the Purchase Price necessary to determine the Final Purchase Price
(except those adjustments to be made pursuant to the provisions of Section 4.3
                                                                   -----------
hereof) and show the calculation of such adjustments in accordance with Section
                                                                        -------
4. The parties shall undertake to agree on the Final Settlement Statement and
- -                                                                            
the Final Purchase Price no later than one hundred twenty (120) days after the
Closing Date.

      13.2  ARBITRATION.   If Seller and Buyer cannot agree upon the Final
Settlement Statement, then the disputed matters shall be submitted to
arbitration pursuant to the provisions of Section 33 hereof.
                                          ----------        

      13.3  PAYMENT OF FINAL PURCHASE PRICE.  If the Final Purchase Price is
more than the Preliminary Amount, Buyer shall pay such difference to Seller in
immediately available funds within five (5) days after the parties have agreed
upon the Final Settlement Statement. If the Final Purchase Price is less than
the Preliminary Amount, Seller shall pay such difference to Buyer in immediately
available funds within five (5) days after the parties have agreed upon the
Final Settlement Statement.

14.   ASSUMPTION OF CERTAIN OBLIGATIONS.   Except as provided for in Section
                                                                     -------
19.6(a), at Closing, Buyer shall assume all costs and liabilities and discharge
- -------                                                                        
all obligations of Seller (a) under all leases, operating agreements, production
sales contracts, farmout agreements and other contracts or 

                                       14
<PAGE>
 
agreements respecting the Properties or relating the ownership or operation of
the Properties from and after the Effective Date, and (b) with respect to all
imbalances associated with the Properties, regardless of their nature or of the
time at which they accrued.

15.  LIMITATION OF WARRANTIES. Anything in this Agreement to the contrary
notwithstanding, the Properties are being sold by Seller to Buyer without
recourse, covenant, or warranty of any kind; express, implied, or statutory,
with the sole exception that Seller will warrant title to the Properties subject
to the Permitted Encumbrances, against every person whomsoever lawfully claiming
or to claim the same or any part thereof by, through, or under Seller, but not
otherwise.  WITHOUT LIMITATION OF THE GENERALITY OF THE IMMEDIATELY PRECEDING
SENTENCE, SELLER WILL CONVEY THE PROPERTIES AS-IS, WHERE-IS AND WITH ALL FAULTS,
AND EXPRESSLY DISCLAIMS AND NEGATES (a) ANY IMPLIED OR EXPRESS WARRANTY OF
MERCHANTABILITY, (b) ANY IMPLIED OR EXPRESS WARRANTY OF FITNESS FOR A PARTICULAR
PURPOSE, AND (c) ANY IMPLIED OR EXPRESS WARRANTY OF CONFORMITY TO MODELS OR
SAMPLES OF MATERIALS.  The representations and warranties made by Seller and
Buyer in Sections 5 and 6 shall survive Closing for a period of six (6) months
         ----------     -                                                     
and shall thereafter be of no further force and effect, excepting only matters
as to which a written claim has been made prior to the end of such six (6) month
time period.

16.  CROSS-INDEMNIFICATION.   Except as expressly limited elsewhere in this
Agreement, in the event that Closing occurs hereunder:

          (a) Buyer agrees to indemnify and hold Seller harmless from and
     against any and all liability, loss, cost and expense (including, without
     limitation, court costs and reasonable attorneys' fees) that are
     attributable to the Properties conveyed to Buyer and are attributable to
     periods of time on or after the Effective Date; and

          (b) Subject to the provisions of Section 19 hereof, Seller agrees to
                                           ----------                         
     indemnify and hold Buyer harmless from and against any and all liability,
     loss, cost and expense (including, without limitation, court costs and
     reasonable attorneys' fees) that are attributable to the Properties
     conveyed to Buyer and are attributable to periods of time before the
     Effective Date;

          (c) The respective indemnity and hold harmless obligations of the
     parties hereto shall not apply to:

               (i) any amount that was taken into account as an upward or
          downward adjustment to the Final Purchase Price pursuant to the
          provisions hereof, but only to the extent of such adjustments,

               (ii) any liability of one Party hereto to any other Party under
          the provisions of this Agreement, or

                                       15
<PAGE>
 
               (iii) each Party's costs and expenses with respect to the
          negotiation and consummation of this Agreement and the purchase and
          sale of the Properties.

17.  CASUALTY LOSS.   Prior to Closing, Seller shall promptly notify Buyer of
any Casualty Loss of which Seller becomes aware. "Casualty Loss" shall mean,
with respect to all or any material portion of a Property, any destruction by
fire, blowout or other casualty (above or below the ground) or any taking, or
pending or threatened taking, in condemnation or under the right to eminent
domain of any Property or portion thereof. If any Casualty Loss occurs, Buyer
may elect to (a) cause Seller to retain the Property affected by the Casualty
Loss, and to reduce the Purchase Price by the Allocated Value of the Property,
in which case Seller shall retain all insurance proceeds relating to the
Casualty Loss, or (b) require Seller to (i) transfer to Buyer such Property
notwithstanding such Casualty Loss and (ii) transfer to Buyer such Property
insurance proceeds, claims, awards and other payments arising out of such
Casualty Loss.  In the event the aggregate of any such payments or reductions in
Purchase Price exceed  ten percent (10%) of the Purchase Price, then either
Seller or Buyer shall have the option to terminate this Agreement. Seller shall
not voluntarily compromise, sell or adjust any amounts payable by reason of any
Casualty Loss without first obtaining the written consent of Buyer.

18.  SOLE REMEDY OF BUYER PRIOR TO CLOSING.   If at any time prior to Closing,
any of the representations and warranties made herein by Seller are materially
incorrect or if Seller fails to fully and timely comply in any material respect
with any of Seller's obligations as set forth herein or as required by
applicable law, Buyer may elect to terminate this Agreement and in such event
Buyer's remedy against Seller shall be to obtain a return of the Deposit
(unless an alternative remedy shall be mutually agreed upon between Buyer and
Seller); provided, however, if Seller shall fail or refuse to comply with any of
its obligations under this Agreement, Buyer shall be entitled to enforce this
Agreement through the remedy of specific performance.

19.  ENVIRONMENTAL MATTERS

     19.1  PRESENCE OF WASTES, NORM, HAZARDOUS SUBSTANCES, AND ASBESTOS. Buyer
acknowledges that the Properties have been used to explore for, develop and
produce oil and gas, and that spills of wastes, crude oil, produced water,
hazardous substances, and other materials may have occurred thereon.
Additionally, the Properties, including production equipment, may contain
asbestos, hazardous substances, or Naturally Occurring Radioactive Material
("NORM"). NORM may affix or attach itself to the inside of wells, materials, and
equipment as scale or in other forms, and NORM-containing material may have been
buried or otherwise disposed of on the Properties. Special procedures may be
required for remediating, removing, transporting, and disposing of asbestos,
NORM, hazardous substances, and other materials from the Property, and Buyer
assumes all liability for the assessment, remediation, removal, transportation,
and disposal of these materials and associated activities in accordance with the
applicable rules, regulations, and requirements of governmental agencies, unless
otherwise provided in this Section 19.
                           ---------- 

     19.2  ADVERSE ENVIRONMENTAL CONDITION.   "Adverse Environmental Condition"
means (a) any contamination or condition exceeding allowed regulatory limits and
not otherwise 

                                       16
<PAGE>
 
permanently authorized by permit or law, resulting from any discharge, release,
disposal, production, storage, treatment, or any other activities on, in or from
any Property prior to the Effective Date, or the migration or transportation
from other lands to any Property, prior to the Effective Date, of any wastes,
pollutants, contaminants, hazardous materials or other materials or substances
subject to regulation relating to the protection of the environment, including,
but not limited to, the Clean Air Act, the Comprehensive Environmental Response,
Compensation and Liability Act of 1980, the Federal Water Pollution Control Act,
the Safe Drinking Water Act, the Toxic Substance Control Act, the Hazardous and
Solid Waste Amendments Act of 1984, the Superfund Amendments and Reauthorization
Act of 1986, the Hazardous Materials Transportation Act, the Clean Water Act,
the National Environmental Policy Act, the Endangered Species Act, the Fish and
Wildlife Coordination Act, the National Historic Preservation Act, and the Oil
Pollution Act of 1990, as well as any state and local regulation or law
governing the same, similar or related matters, and (b) any such contamination
or condition in existence prior to the Effective Date temporarily authorized by
permit, fee agreement or other arrangement.

     19.3  ENVIRONMENTAL ASSESSMENT.   After the execution of this Agreement,
Buyer shall have the opportunity to conduct at its sole risk and expense an
environmental assessment of the Properties. Seller will provide reasonable
access for this purpose to Properties operated by Seller; for any Property not
operated by Seller, however, Buyer must contact the operator of any such non-
operated Property directly. Buyer or any of its representations and agents must
comply with Seller's environmental and safety rules and policies while
performing any environmental assessment on Seller-operated Properties. Buyer
agrees it will not disclose any information obtained in its environmental
assessment to third parties unless agreed to in writing by Seller or unless such
disclosure is expressly required by applicable law or regulation or is compelled
pursuant to legal process of any court or governmental authority. Buyer will
notify Seller in advance of any such disclosure and will furnish Seller copies
of all materials to be disclosed prior to any disclosure thereof to third
parties. As soon as possible after Buyer's receipt thereof, Buyer shall forward
to Seller copies of all reports, data, analysis, test results, remediation cost
estimates, and recommended remediation procedures or other information
concerning or derived from Buyer's environmental assessment.

     19.4  NOTICE OF ADVERSE ENVIRONMENTAL CONDITIONS.   Buyer shall notify
Seller in writing of any claimed Adverse Environmental Condition not less than
ten (10) days prior to the Closing Date (Environmental Defects Notice). The
Environmental Defects Notice shall (a) set forth in reasonable detail the Well
and/or Lease with respect to which a claimed Adverse Environmental Condition is
made, (b) the nature of such claimed Adverse Environmental Condition, and (c)
Buyer's proposed calculation of the cost to remediate each claimed Adverse
Environmental Condition (Remediation Value). Except as provided for in Section
                                                                       -------
19.7 hereof, Buyer shall waive its right to assert any claim or liability
- ----                                                                     
against Seller arising out of or in any way related to any Adverse Environmental
Condition not set forth in an Environmental Defects Notice delivered to Seller
not less than ten (10) days prior to the Closing Date.

     19.5  DETERMINATION OF ADVERSE ENVIRONMENTAL CONDITIONS AND REMEDIATION
VALUES. Within five (5) days after Seller's receipt of the Environmental Defects
Notice, Seller shall notify Buyer whether Seller agrees with Buyer's claimed
Adverse Environmental Conditions and/or the 

                                       17
<PAGE>
 
Remediation Value (Seller's Environmental Response). If Seller does not agree
with any claimed Adverse Environmental Condition and/or the Remediation Value,
then the parties shall enter into good faith negotiations and shall attempt to
agree on such matters. If the parties cannot reach agreement concerning either
the existence of an Adverse Environmental Condition or the Remediation Value
within ten (10) days after Buyer's receipt of Seller's Environmental Response,
then the matter shall be submitted to arbitration pursuant to the provisions of
Section 33 hereof and for purposes of Closing and Sections 8.3, 9.3 and 19.6
- ----------                                        ------------  ---     ----
hereof, an amount equal to Buyer's good faith estimate of the Remediation Value
shall control. Accordingly, at Closing, the Purchase Price shall be adjusted
based upon an estimate (as aforesaid) and the final value of the Remediation
Value, as decided by arbitration shall be a post Closing adjustment item to be
made pursuant to Section 13.1 hereof.
                 ------------        

     19.6  REMEDIES FOR ADVERSE ENVIRONMENTAL CONDITIONS. As to any Adverse
Environmental Condition, Seller (and Buyer with respect to subparagraphs (c) and
(d) below) shall have the election to:
 
           (a) remediate such Adverse Environmental Condition at Seller's sole
     cost in accordance with applicable environmental laws, and there shall be
     no adjustment to the Purchase Price in respect of such Adverse
     Environmental Condition and the provisions of Section 19.8 below shall
                                                   ------------
     thereafter apply in all respects;

           (b) reduce the Purchase Price by the applicable Remediation Value,
     which in no event shall exceed the Allocated Value of the Leases and/or
     Well affected by such Adverse Environmental Condition, in which event
     Seller shall have no other or further obligation or liability in respect of
     such Adverse Environmental Condition and the provisions of Section 19.8
                                                                ------------
     below shall thereafter apply in all respects;

           (c) delete from this Agreement the Property which contains the
     Adverse Environmental Condition and adjust the Purchase Price by the
     Allocated Value of such Property; or

           (d) in the event the aggregate sum of the Remediation Values exceeds
     ten percent (10%) of the Purchase Price, terminate this Agreement, in which
     case neither party shall have any further liability or obligation to the
     other hereunder except as regards obligations imposed by any
     confidentiality agreement, which shall survive such termination and be
     enforceable in accordance with the terms thereof.

If Seller elects (a) above, it will exercise all reasonable efforts and
diligence to complete remediation within six (6) months of the Closing Date, but
any failure to complete its efforts by such time shall not relieve Seller of its
duty to satisfy its obligation hereunder. Buyer shall allow Seller and its
agents and representatives such access to the Properties as is reasonably
necessary for performance of remediation work. Seller will conduct such work so
as not to unreasonably interfere with Buyer's or any designated operator's
operations.

                                       18
<PAGE>
 
     19.7   POST-CLOSING ADJUSTMENTS.  In addition to the rights granted to
Buyer above, Buyer shall have the right for a period of six (6) months following
Closing to provide Seller with written notice of any Adverse Environmental
Conditions with respect to the Properties which Buyer discovers subsequent to
the Closing.  The notice provided by Buyer to Seller of any such Adverse
Environmental Conditions shall contain the same information as is required to be
included in the Environmental Defects Notice as set out in Section 19.4 above.
                                                           ------------        
The Remediation Value of any such Adverse Environmental Conditions shall be
determined in the manner  set out in Section 19.5 above. Within five (5) days of
                                     ------------                               
the final determination of the Remediation Value of any such Adverse
Environmental Condition, Seller shall advise Buyer in writing of whether Seller
elects to (a) remediate such Adverse Environmental Condition at its sole cost
and expense in the manner set out in Section 19.6(a) above or (b) pay to Buyer
                                     ---------------                          
an amount equal to the Remediation Value of such Adverse Environmental Defect;
provided, however, in no event shall Seller ever be liable to Buyer for Adverse
Environmental  Conditions under this Section 19.7 in an aggregate amount in
                                     ------------                          
excess of $750,000. If Seller elects to pay Buyer for the Remediation Value of
an Adverse Environmental Condition, such payment shall be made to Buyer within
five (5) days of said election.   Buyer shall absolutely and forever waive its
right to assert any claim or liability against Seller arising out of or in any
way related to any Adverse Environmental Condition as to which Buyer has not
provided written notice to Seller within six (6) months of Closing.

     19.8  BUYER'S INDEMNIFICATION OF ADVERSE ENVIRONMENTAL CONDITIONS.  Except
for the costs associated with Seller's remediation of any Adverse Environmental
Conditions pursuant to Section 19.6(a) above (which shall be completed to
                       ---------------                                   
Buyer's reasonable satisfaction at Seller's sole cost and expense as soon as
reasonably practical, but in no event later than one (1) year after the Closing)
and Sellers obligations under Section 19.7 hereof, in the event that Closing
                              ------------                                  
occurs hereunder, Buyer shall indemnify, defend and hold Seller harmless from
and against any and all claims, demands, causes of action, liabilities and
obligations, and all costs and expenses (including, without limitation,
reasonable attorneys' fees and court costs) associated with all Adverse
Environmental Conditions arising before or after the Effective Date, including,
without limitation, any such conditions arising out of or relating to any
discharge, release, disposal, production, storage, treatment or any activities
on, in or from the Properties, or the migration or transportation from any other
lands to the Properties, whether before or after the Effective Date, of
materials or substances that are at present, or become in the future, subject to
regulation under federal, state or local laws or regulations, whether such laws
or regulations now exist or are hereafter enacted, INCLUDING, WITHOUT
LIMITATION, ANY CLAIMS, DEMANDS, CAUSES OF ACTION, LIABILITIES, OR OBLIGATIONS
ARISING IN WHOLE OR IN PART FROM THE SOLE OR CONCURRENT NEGLIGENCE OR STRICT
LIABILITY OF SELLER. BUYER HEREBY RELEASES SELLER FROM AND AGAINST ANY AND ALL
CLAIMS FOR CONTRIBUTION UNDER CERCLA AND/OR ANY OTHER ENVIRONMENTAL LAW OR
REGULATION.

20.  DTPA WAIVER.   To the extent applicable to the transaction contemplated
hereby or any portion thereof, Buyer waives the provisions of the Texas
Deceptive Trade Practices Act, Chapter 17, Subchapter E, Sections 17.41 through
17.63, inclusive (other than Section 17.555 which is not waived) of the Texas
Business and Commerce Code.  In connection with such waiver, Buyer hereby
represents and warrants to Seller that Buyer (a) is in the business of seeking
or acquiring by purchase 

                                       19
<PAGE>
 
or lease, goods or services, for commercial or business use, (b) has assets of
$5,000,000 or more according to its most recent financial statement, (c) has
knowledge and experience in financial and business matters that enable it to
evaluate the merits and risks of the transaction contemplated hereby, and (d) is
not in a significantly disparate bargaining position.

21.  FURTHER ASSURANCES.   After the Closing, Seller and Buyer shall execute,
acknowledge and deliver, or cause to be executed, acknowledged and delivered,
such instruments and take such other action as may be reasonably necessary or
advisable to carry out their obligations under this Agreement and under any
exhibit, document, certificate or other instrument delivered pursuant hereto.
Seller shall use its best efforts to obtain all approvals and consents required
by or necessary for the transactions contemplated by this Agreement that are
customarily obtained after Closing, provided that Seller shall not be required
to expend any funds to obtain such approvals and consents.

22.  ACCESS TO RECORDS.  As soon as practicable after Closing, Seller shall
deliver to Buyer, at Seller's address, or at such other place as any of same may
be kept, the originals of all Data, except that Seller may retain the originals
of all Data which relates to properties other than the Properties being sold
herein, in which case Seller shall deliver duplicate copies of any such retained
originals to Buyer. For a period of six (6) years after the date of Closing,
Buyer will retain the Data delivered to it pursuant hereto and will make such
Data available to Seller upon reasonable notice at Buyer's headquarters at
reasonable times and during office hours. Buyer shall notify Seller in writing
within thirty (30) days of the sale to a third party of all or any part of the
Properties which involves the transfer of any of the Data of the name and
address of the buyer(s) in any such sale. Buyer shall require as part of any
such sales transaction that such third party assume the obligations imposed on
Buyer in this Section 22.
              ---------- 

23.  USE OF BUYER'S NAME.  Buyer agrees that, as soon as practicable after the
Closing, Buyer will remove or cause to be removed the names and marks "AVIVA",
"Aviva America, Inc.", and all variations and derivatives thereof and logos
relating thereto from the Properties of which it has assumed operations and will
not thereafter make any use whatsoever of such names, marks, and logos.

24.  NOTICES.  All notices required or permitted under this Agreement shall be
in writing and shall be delivered personally or by telecopier as follows:

Seller:   AVIVA AMERICA, INC.
          Suite 400 LB 84
          8235 Douglas Avenue
          Dallas, TX 75225
          Telephone: (214) 691-3464
          Fax/Telecopier: (214) 361-0010
          Attention: Mr. Ron Suttill, President

                                       20
<PAGE>
 
Buyer:    BWAB INCORPORATED
          475 Seventeenth Street, Suite 1600
          Denver, Colorado 80202
          Telephone:  (303) 295-7444
          Fax/Telecopier:  (303) 294-9878
          Attention:  Mr. Steven A. Roitman, Principal

or to such other place within the United States of America as either Seller or
Buyer may designate as to themselves by written notice to the other. All notices
given by personal delivery or mail shall be effective on the date of actual
receipt at the appropriate address. Notice given by telecopier shall be
effective upon actual receipt if received during recipient's normal business
hours or at the beginning of the next business day after receipt if received
after the recipient's normal business hours. All notices by telecopier shall be
confirmed promptly after transmission, by mail or personal delivery.

25.  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Texas.

26.  ASSIGNMENT.  This Agreement shall be binding upon and shall inure to the
benefit of the parties hereto; it shall not, however, be assignable by Buyer
without Seller's prior written consent, which consent shall not be unreasonably
withheld in the event of a proposed assignment to an affiliate which is
financially capable of performing Buyer's obligations under this Agreement.

27.  ENTIRE AGREEMENT; AMENDMENTS; WAIVERS.  This Agreement constitutes the
entire agreement between the parties hereto with respect to the subject matter
hereof, superseding all prior negotiations, discussions, agreements and
understandings, whether oral or written, relating to such subject matter. This
Agreement may not be amended and no rights hereunder may be waived except by a
written document signed by the party to be charged with such amendment or
waiver. No waiver of any of the provisions of this Agreement shall be deemed or
shall constitute a waiver of any other provisions hereto (whether or not
similar) nor shall such waiver constitute a continuing waiver unless otherwise
expressly provided.

28.  HEADINGS.  The headings of the articles and sections of this Agreement and
any listing of its contents are for guidance and convenience of reference only
and shall not limit or otherwise affect any of the terms or provisions of this
Agreement.

29.  COUNTERPARTS.  This Agreement may be executed by Buyer and Seller in any
number of counterparts, each of which shall be deemed an original instrument,
but all of which together shall constitute but one and the same instrument.

30.  EXPENSES, FEES AND TAXES.  Each of the parties hereto shall pay its own
fees and expenses incident to the negotiation and preparation of this Agreement
and consummation of the transactions contemplated hereby, including broker fees.
Buyer shall be responsible for the cost of all fees for the recording of
transfer documents. All other costs shall be borne by the party incurring them.
Notwithstanding anything to the contrary herein, it is acknowledged and agreed
by and between 

                                       21
<PAGE>
 
Seller and Buyer that the Purchase Price excludes any sales taxes or other taxes
in connection with the sale of property pursuant to this Agreement. If a
determination is ever made that a sales tax or other transfer tax applies, Buyer
shall be liable for such tax as well as any applicable conveyance, transfer and
recording fees, and real estate transfer stamps or taxes imposed on any transfer
of property pursuant to this Agreement. Buyer shall indemnify and hold Seller
harmless with respect to the payment of any of such taxes, including any
interest or penalties assessed thereon.

31.  LAWS AND REGULATIONS.  From and after the Closing, (a) Buyer shall comply
with all applicable laws, ordinances, rules and regulations and shall properly
obtain and maintain all permits required by public authorities with regard to
the Properties, and shall provide and maintain with the applicable regulatory
agency(ies) all required bonds, and (b) Buyer shall assume all of Seller's
obligations with regard to abandonment of all existing unplugged wells, whether
producing or nonproducing, and abandonment of the leasehold property including,
where applicable, the plugging of wells and the restoration of the surface as
completely as practicable and/or in compliance with all applicable laws, rules,
regulations and in compliance with all leases and other agreements affecting the
Properties, and shall indemnify and hold Seller harmless with respect to any and
all of those obligations. Such obligations shall survive the Closing and Buyer
shall remain liable therefor as regards Seller even if Buyer shall assign, sell
or transfer the Properties to a third party.

32.  CONFIDENTIALITY; PUBLIC ANNOUNCEMENTS.   The terms of this Agreement are
considered confidential to the parties hereto, and neither party may disclose
any of the terms of this Agreement to any third person prior to the Closing
without the prior written consent of the other party (which consent will not be
unreasonably withheld); provided that each party may disclose the terms of this
Agreement as required by applicable laws or the applicable rules and regulations
of any governmental agency or securities exchange, and the parties hereto may
disclose the terms of this Agreement to those of its and its affiliates'
employees, directors, attorneys, accountants, engineers and other consultants as
may be required in connection with the negotiation, evaluation and
implementation of this Agreement. Except as may be required by applicable laws
or the applicable rules and regulations of any governmental agency or securities
exchange, neither Buyer nor Seller shall issue any such press release or other
publicity without the prior written consent of the other party, which consent
shall not be unreasonably withheld.

33.  ARBITRATION.  Except as otherwise specifically provided herein, any
controversy under this Agreement shall be submitted to arbitration in Dallas,
Texas, in accordance with the Commercial Arbitration Rules of the American
Arbitration Association.  Upon written demand of either party, the parties shall
meet and attempt to appoint a single arbitrator.  If the parties fail to name an
arbitrator within ten (10) days from such demand, then the arbitrator(s) shall
be selected by the American Arbitration Association from the panels of
arbitrators of the American Arbitration Association.  The arbitrator(s) selected
to act hereunder shall be qualified by education and training to pass upon the
particular question in dispute and shall make a decision on the dispute within
thirty (30) days after his or their appointment, subject to any reasonable delay
due to unforeseen circumstances. The compensation and expenses of the
arbitrator(s) shall be borne equally by the parties.  Arbitration may proceed in
the absence of any party if notice of the proceedings has been given to such
party.  The parties agree to abide by all awards rendered in such proceedings.

                                       22
<PAGE>
 
34.  EXHIBITS.  The following Exhibits and Schedules are incorporated herein and
are a part hereof:

                                    EXHIBITS
                                    --------

                               Exhibit A - Wells
                               Exhibit B - Leases
                          Exhibit C - Allocated Values
          Exhibit D - Form of Assignment, Bill of Sale and Conveyance

                                   SCHEDULES
                                   ---------

                         Schedule 4.3 - Gas Imbalances
              Schedule 5.5 - Preferential Purchase Rights/Consents
                      Schedule 5.6 - Litigation and Claims
                    Schedule 5.15 - Outstanding Obligations


Executed as of the date set forth above.

SELLER

     AVIVA AMERICA, INC.

By: /s/ Ronald Suttill
   --------------------------------
Its: President
    -------------------------------

BUYER

     BWAB INCORPORATED


By: /s/ Randall C. Roulier
   --------------------------------

Its: President
    -------------------------------

                                       23

<PAGE>
 
                                                                   EXHIBIT 10.59

                          PURCHASE AND SALE AGREEMENT

This Purchase and Sale Agreement (this "Agreement") is made and entered into on
this the  6th day of December, 1996, between AVIVA AMERICA, INC., a Delaware
corporation (Seller), and Lomak Petroleum Inc., a Delaware corporation and/or
its permitted affiliates (Buyer).

1.   SALE AND PURCHASE OF THE PROPERTIES.   Subject to the terms and conditions
herein set forth, Seller agrees to sell, assign, convey and deliver to Buyer and
Buyer agrees to purchase and acquire from Seller at the Closing, but effective
as of 7:00 a.m. on October 1, 1996 (the Effective Date), the Properties.  The
term "Properties" shall mean:

          (a) All of Seller's right, title and interest in the oil and gas
     leases described in Exhibit B (the "Leases") and in the wells described in
                         ---------
     Exhibit A (the "Wells");
     ---------

          (b) All of Seller's right, title and interest in all wells, equipment,
     fixtures, production facilities, personal property and improvements
     (including, without limitation, materials, plants, pipelines, gathering and
     processing systems and salt water disposal systems) which are located on,
     appurtenant to or used in connection with the Leases and Wells now, as of
     the Effective Time or as of the Closing Date (the "Equipment");

          (c) All of Seller's right, title and interests in all contracts,
     instruments, payout balances, commitments, licenses, servitudes, permits,
     easements, rights-of-way and other rights of Seller relating to the items
     described in this Paragraph 1, together with all of Seller's rights, claims
     and causes of action under such items arising after the Effective Time (the
     "Contracts"), but specifically excluding all of Seller's rights, claims and
     causes of action under such items arising before the Effective Time;

          (d) All of Seller's right, title and interest in oil, gas, condensate,
     related hydrocarbons and other minerals produced from the Leases after the
     Effective Time (the "Substances"):

          (e) All accounts, instruments, general intangibles, liens and security
     interests arising from the sale or other disposition of the items described
     in this Paragraph 1 on or after the Effective Time (the "Accounts"); and

          (f) All of Seller's information relating to the Leases and the Wells,
     including geological, engineering, and proprietary geophysical and seismic
     data (both "2-D" and "3-D"), navigation tapes, logs, core analysis,
     formation tests, production records, land, title, accounting and contract
     files; but excluding materials which are subject to confidentiality
     agreements with third parties that prohibit sale or disclosure.

2.   PURCHASE PRICE.   The purchase price for the Properties shall be $955,000
(the "Purchase Price"), subject to any applicable adjustments as are hereinafter
provided.

                                       1
<PAGE>
 
3.   DEPOSIT.  Contemporaneously with the execution of this Agreement, Buyer
will deposit into an escrow account (to be established at a mutually acceptable
bank with assets in excess of $100 million), an amount equal to ten percent
(10%) of the Purchase Price (hereinafter called the "Deposit").  Buyer and
Seller agree that the escrow instructions shall specify that if Buyer and Seller
close the transaction contemplated by this Agreement, the Deposit shall be
applied to the Purchase Price and the amount due from Buyer at Closing will be
reduced, in addition to any other deductions provided for herein, by the amount
of the Deposit.  The Deposit shall be refunded to Buyer in the event that this
Agreement is terminated (a) because Buyer's conditions to Closing set out in
Paragraph 9 hereof are not satisfied and Buyer is not then in default under this
- -----------                                                                     
Agreement or (b) pursuant to the provisions of Sections 8.3, 9.3, 17 or 19.6(d)
                                               ------------  ---  --    -------
hereof.  Otherwise, should Buyer fail or refuse to consummate the purchase of
the Properties hereunder, Seller shall be entitled to retain the Deposit as
liquidated damages as its sole and exclusive remedy (it being agreed that
damages in such event would be extremely difficult to determine and that the
Deposit represents a fair and reasonable estimate of damages under such
circumstances and does not constitute a penalty).  In the event that this
Agreement is terminated under conditions which entitle Buyer to a return of the
Deposit, the Deposit shall be returned to Buyer within ten (10) days of such
termination.

4.   ADJUSTMENTS TO PURCHASE PRICE; FINAL PURCHASE PRICE.  The Purchase Price
shall be adjusted as follows and the resulting amount shall be referred to
herein as the Final Purchase Price:

     4.1  INCREASES IN PURCHASE PRICE.  The Purchase Price shall be increased
by an amount equal to the sum of the following amounts:

          4.1.1 The amount of costs and expenses, including, without limitation,
     such capital expenditures as are permitted by Section 7.1.1. below incurred
                                                   --------------
     by Seller in the ordinary course of Seller's business and customary
     overhead charges related to the Properties from the Effective Date to the
     Closing Date.

          4.1.2 The amount of all prepaid expenses, including, without
     limitation. ad valorem, property and similar taxes and assessments based
     upon or measured by ownership of the Properties and attributable to periods
     of time after the Effective Date.

          4.1.3 In the event that there is a cumulative net underproduction
     imbalance attributable to Seller's working interest in the Properties as of
     the Effective Date, an amount equal to the product of (a) the Imbalance
     Unit Value (as hereinafter defined) and (b) the volume (stated in Mcf's) of
     such cumulative net underproduction imbalance attributable to Seller's
     working interest in the Properties as of the Effective Date. The "Imbalance
     Unit Value" shall mean a per Mcf value for imbalances to be agreed upon
     between Seller and Buyer prior to Closing (or determined pursuant to
     Paragraph 33 hereof if Seller and Buyer are unable to reach an agreement).
     ------------                               

          4.1.4 As to Wells in which Seller's Net Revenue Interest (as defined
     in Section 10 below) is determined to be greater than the decimal interest
        ----------
     noted in Exhibit A, an amount determined by multiplying the Allocated Value
              ---------
     (as hereinafter defined) for Seller's interest in

                                       2
<PAGE>
 
     the Well in question by a fraction, the numerator of which shall be the
     decimal increase in Seller's Net Revenue Interest in such Well from the
     interest shown for such Well in Exhibit A and the denominator of which
                                     ---------
     shall be the Net Revenue Interest shown for such Well on such Exhibit.
 
          4.1.5 The value of all merchantable oil and other products in tanks
     above the pipeline sales connection at the Effective Date that is credited
     to the Properties, such value to be the market or, if applicable, the
     contract price in effect as of the Effective Date, less any applicable
     severance taxes and royalties.
 
     4.2  DECREASES IN PURCHASE PRICE.  The Purchase Price shall be decreased by
an amount equal to the sum of the following amounts:
 
          4.2.1 The amount of all proceeds received by Seller, net of all
     applicable taxes and royalties attributable to production from the
     Properties for periods of time after the Effective Date.
 
          4.2.2 In the event that there is a cumulative net overproduction
     imbalance attributable to Seller's working interest in the Properties as of
     the Effective Date, an amount equal to the product of (a) the Imbalance
     Unit Value and (b) the volume (stated in Mcf's) of such cumulative net
     overproduction imbalance attributable to Seller's working interest in the
     Properties as of the Effective Date.

          4.2.3 An amount equal to all ad valorem, property, and similar taxes
     and assessments based upon or measured by Seller's ownership of the
     Properties that are unpaid as of the Closing Date and attributable to
     periods of time prior to the Effective Date (for which Buyer agrees to
     assume liability hereunder), which amounts shall be computed based upon
     such taxes and assessments for the calendar year 1996; provided that if
     such taxes or assessments are assessed on other than a calendar year basis,
     for the tax related year last ended.
 
          4.2.4 Any amount determined in connection with uncured Title Defects
     as provided for in Section 10.4 below.
                        ------------       

          4.2.5 Any amount determined in connection with any Casualty Loss as
     provided for in Section 17 below.
                     ----------       

          4.2.6 Any amount determined in connection with Adverse Environmental
     Conditions as provided for in Section 19.6(b) and/or (c) below.
                                   ---------------        ---       

          4.2.7 Any amount determined in connection with an Accounting Defect as
     provided for in Section 10.8 below.
                     ------------       

                                       3
<PAGE>
 
     4.3. GAS IMBALANCES.  The adjustments to be made to the Purchase Price at
Closing based upon the net cumulative gas imbalances attributable to Seller's
working interest in the Properties shall be made based upon the gas imbalance
schedule attached hereto as Schedule 4.3.  Buyer and Seller shall have a period
                            ------------                                       
of six (6) months following the date of Closing to verify the accuracy of
Schedule 4.3.  Buyer and Seller agree to cooperate with each other following
- ------------                                                                
Closing to determine the accuracy of Schedule 4.3 and to determine what
                                     ------------                      
adjustments, if any,  are required to make to Schedule 4.3 in order to make
                                              ------------                 
Schedule 4.3 accurate.   Within ten (10) days following the end of such six (6)
- ------------                                                                   
month time period, Buyer shall deliver to Seller a written statement (Buyer's
Gas Balancing Statement) setting out any adjustments Buyer proposes to be made
to Schedule 4.3 along with such supporting documentation as may be required to
   ------------                                                               
verify any changes Buyer is proposing be made. Within five (5) days of Seller's
receipt of Buyer's Gas Balancing Statement, Seller shall advise Buyer in writing
whether Seller agrees with Buyer's Gas Balancing Statement and, if not, what
changes Seller proposes be made to Buyer's Gas Balancing Statement.  The parties
shall thereafter undertake to agree with respect to the adjustments, if any,
which are required to be made to Schedule 4.3 at the earliest practical date.
                                 ------------                                
Any final amounts owed by either party to the other as a result of any changes
to Schedule 4.3 shall be paid in immediately available funds within five (5)
   ------------                                                             
days of the date the parties reach a final agreement with respect to
Schedule 4.3.
- ------------ 
 
5.   REPRESENTATIONS AND WARRANTIES OF SELLER.   Seller represents and warrants
to Buyer that:

     5.1  ORGANIZATION.  Seller is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and is
qualified to do business in and in good standing under the laws of the state(s)
where the Properties are located.
 
     5.2  AUTHORITY.  Seller has full power and authority and has taken all
requisite action, corporate or otherwise, to authorize it to carry on its
business as currently conducted, to enter into this Agreement and to perform its
obligations under this Agreement.
 
     5.3  ENFORCEABILITY.  This Agreement has been duly executed and delivered
on behalf of Seller and constitutes the legal, valid and binding obligation of
Seller enforceable in accordance with its terms. At the Closing, all documents
required hereunder to be executed and delivered by Seller shall be duly
authorized, executed and delivered and shall constitute legal, valid and binding
obligations of Seller enforceable in accordance with their respective terms.
 
     5.4  CONTRACTS.  All material leases, operating agreements, production
sales contracts, farmout agreements and other material contracts or agreements
respecting the Properties can be found either of record in the counties in which
the Properties are located or are reflected or referenced in Seller's files.
 
     5.5  PREFERENTIAL PURCHASE RIGHTS/CONSENTS.  Schedule 5.5 sets forth all
                                                  ------------               
consents and approvals required to be obtained for, and all preferential
purchase rights exercisable in connection with, the assignment of the Properties
to Buyer, except for those constituting Permitted Encumbrances.

                                       4
<PAGE>
 
     5.6   LITIGATION AND CLAIMS. Except as set forth in Schedule 5.6, no claim,
                                                         ------------
filing, cause of action, administrative proceeding, lawsuit or other litigation
is pending or threatened in writing that could reasonably be expected to now or
hereafter materially and adversely affect Buyer's ownership, operation or value
of any of the Properties.

     5.7   NO MATERIAL DEFAULT.  Seller is not in material default under any of
the contracts or agreements referred to in Section 5.4.

     5.8   PROPERTY OBLIGATIONS. To the best of Seller's knowledge, all rentals,
royalties, shut-in royalties, overriding royalties and other payments due
pursuant to ro with respect to the Leases have been properly paid.

     5.9   PROPERTY OPERATION.  To the best of Seller's knowledge: (i) the
Properties have been drilled, completed, operated, developed and produced in
material compliance with all applicable judgments, orders, laws, rules and
regulations; and (ii) all necessary certificates, consents, permits, licenses
and other governmental authorizations affecting the Properties have been
obtained and are in force.

     5.10  TAKE-OR PAY.  Seller is not obligated, under a take-or-pay or similar
arrangement, or by virtue of an election to non-consent, or not participate in a
past or current operation on the Properties pursuant to the applicable operating
agreements, to produce hydrocarbons, or allow hydrocarbons to be produced,
without receiving full payment at the time of delivery in an amount that
corresponds to the net revenue interest in the hydrocarbons described on
Exhibit A.
- --------- 

     5.11  TAXES.  All taxes based on or measured by the ownership of property,
the production or removal of hydrocarbons and the receipt of proceeds which are
due and relating to the Properties have been properly paid, subject to possible
adjustment for volume or price corrections.

     5.12  TIMELY PAYMENT.  Seller is timely receiving its share of proceeds
from the sale of hydrocarbons produced from the Properties without suspense,
counterclaim or set-off, except for immaterial amounts.  To the best of Seller's
knowledge, there has been no production of hydrocarbons from the Properties in
excess of the allowable production established pursuant to applicable state or
federal law or regulation that would result in a restriction on production from
the Leases subsequent to the Effective Time.

     5.13  PROPERTY CONDITION.  To the best of Seller's knowledge, there has
been no material adverse change in the condition of any of the Properties or
Equipment after the Effective Date except depletion through normal production
within authorized allowables, changes in rates of production that occur in the
ordinary course of operation and depreciation of Equipment through ordinary wear
and tear.

     5.14  BROKERS' FEES.  Seller has incurred no liability for brokers' fees or
finders' fees, including the fees of Wellspring Partners, related to the
transactions contemplated by this Agreement for which Buyer shall be liable.

                                       5
<PAGE>
 
     5.15  OUTSTANDING OBLIGATIONS.  Except as otherwise described in Schedule
                                                                      --------
5.15 hereof, to the best of Seller's knowledge there are no outstanding
- ----                                                                   
authorizations for expenditures or any written commitments or proposals to
conduct operations on the Properties which are required to be approved by non-
operators under the terms of the applicable operating agreement.

     5.16  COMPLIANCE.  To the best of Seller's knowledge, the Properties have
been operated in material compliance with all applicable laws, regulations,
orders, judgments, licenses and permits concerning the prevention, abatement or
elimination of pollution and the protection of the environment and there is no
circumstance which could reasonably be expected to (i) materially interfere with
continued compliance, (ii) give rise to material liability, (iii) form the basis
for any material claim, suit, relief or investigation, or (iv) require a
material change in the present condition or operation of the Properties.

6.  REPRESENTATIONS AND WARRANTIES OF BUYER.   Buyer represents and warrants to
Seller that:

     6.1   ORGANIZATION. Buyer is a corporation duly organized, validly existing
and in good standing under the laws of the state of its incorporation and is
qualified (or will be qualified at the time of Closing) to do business in and in
good standing under the laws of the state(s) where the Properties are located.

     6.2   AUTHORITY.  Buyer has full power and authority and has taken all
requisite action, corporate or otherwise, to enter into this Agreement, to
purchase the Properties on the terms described in this Agreement and to perform
its other obligations under this Agreement.

     6.3   ENFORCEABILITY.  This Agreement has been duly executed and delivered
on behalf of Buyer, and constitutes the legal, valid and binding obligation of
Buyer enforceable in accordance with its terms. At the Closing, all documents
required hereunder to be executed and delivered by Buyer shall be duly
authorized, executed and delivered and shall constitute legal, valid and binding
obligations of Buyer enforceable in accordance with their respective terms.

     6.4   DUE DILIGENCE.  Buyer represents that it has performed, or will
perform before Closing, necessary evaluations and assessments relating to the
Properties to enable it to make an independent determination with respect to its
acquisition of the Properties under the terms of this Agreement.

     6.5   INVESTMENT INTENT.  Buyer is a knowledgeable purchaser, owner, and
operator of oil and gas properties, has the ability to evaluate (and in fact has
evaluated) the Properties for purchase and is acquiring the Properties for its
own account and not with the intent to make a distribution thereof in violation
of the Securities Act of 1933 as amended (and the rules and regulations
pertaining thereto), or in violation of any other applicable securities laws.

     6.6   FUNDS AVAILABLE.  Buyer has, or will have (based upon its current
creditworthiness) prior to the Closing Date, sufficient cash, available lines of
credit or other sources of immediately available funds to enable it to make
payment of the Purchase Price.

                                       6
<PAGE>
 
     6.7  BROKERS FEES.  Buyer has incurred no liability for brokers' fees or
finders' fees related to the transactions contemplated by this Agreement for
which Seller shall be liable.

7.   COVENANTS OF SELLER.

     7.1  CONDUCT OF BUSINESS PENDING CLOSING.  Seller covenants that from the
date hereof to the Closing Date, except (a) as provided herein, (b) as required
by any existing obligation, agreement, lease, contract, or instrument to which
the Properties are subject, or (c) as otherwise consented to in writing by
Buyer, Seller will:
 
          7.1.1 Not (a) act in any manner with respect to the Properties other
     than in the normal, usual and customary manner, consistent with prior
     practice; (b) dispose of, encumber or relinquish any of the Properties
     (other than relinquishments resulting from the expiration of leases that
     Seller has no contractual right or option to renew); (c) waive, compromise
     or settle any material right or claim with respect to any of the
     Properties; or (d) conduct capital or workover projects with respect to the
     Properties in excess of $10,000.00, except when required by an emergency
     when there shall have been insufficient time to obtain advance consent.

          7.1.2  Use its best efforts to preserve relationships with all third
     parties having business dealings with respect to the Properties.

          7.1.3 Cooperate with Buyer in connection with any required
     notification of applicable governmental regulatory authorities of the
     transactions contemplated hereby and cooperate with Buyer in obtaining the
     issuance by each such authority of such permits, licenses and
     authorizations as may be necessary for Buyer to own and operate the
     Properties following the consummation of the transactions contemplated by
     this Agreement.

          7.1.4 Notify Buyer of the discovery by Seller that any Representation
     or Warranty of Seller contained in this Agreement is or becomes materially
     untrue or will be materially untrue on the Closing Date.

     7.2  ACCESS.  Seller shall afford to Buyer and its authorized
representatives reasonable access, at Buyer's sole risk and expense, from the
date hereof until the Closing Date during normal business hours, to (a) the
Properties operated by Seller, provided, however, that Buyer shall indemnify and
hold harmless Seller and its co-owners, and their respective officers, directors
and employees from and against any and all losses, costs, damages, obligations,
claims, liabilities, expenses and causes of action arising from Buyer's
inspection of the Properties. including, without limitation, claims for personal
injuries, property damage and reasonable attorneys' fees, and (b) Seller's
operating, accounting, contract, legal files, and records, regarding the
Properties ("Data"); provided, however, that Data shall not include (a) any
attorney work product or attorney client communications which Seller reasonably
believes to be privileged or (b) information, the disclosure of which would
violate any confidentiality agreement to which Seller is bound; provided that
Seller agrees to disclose sufficient information about any such confidentiality
agreements to enable Buyer 

                                       7
<PAGE>
 
to request waivers of the same to enable it to conduct its due diligence
reviews. Until Closing, Buyer shall exercise reasonable care in safeguarding and
maintaining the confidentiality of all data or information regarding the
Properties provided by Seller to Buyer. In the event this Agreement is
terminated prior to Closing, Buyer will immediately return to Seller all copies
of such data or information and shall continue to maintain the confidentiality
of all information regarding the Properties provided by Seller to Buyer for a
period of twelve (12) months from the date of such termination.

     7.3  CONSENTS; APPROVALS.  Seller will cooperate with Buyer and take all
action reasonably necessary to attempt to obtain all permissions, approvals and
consents as may be required to consummate the transactions contemplated in this
Agreement, including, but not limited to, obtaining waivers of any required
consents to transfer and preferential rights to purchase set out in Schedule 5.5
                                                                    ------------
hereto.

8.   CONDITIONS PRECEDENT TO THE OBLIGATIONS OF SELLER.  The obligations of
Seller to be performed at Closing are subject to the fulfillment (or waiver by
Seller in its sole discretion) before or at Closing, of each of the following
conditions:

     8.1  REPRESENTATIONS AND WARRANTIES.   The Representations and Warranties
by Buyer set forth in this Agreement shall be true and correct in all material
respects at and as of the Closing as though made at and as of the Closing; and
Buyer shall have performed and complied with, in all material respects, all
covenants and agreements required to be performed and satisfied by Buyer at or
prior to the Closing.

     8.2  NO LITIGATION.   No suit, action or other proceedings shall, on the
date of Closing, be pending or threatened before any court or governmental
agency seeking to restrain, prohibit, or obtain substantial damages or other
material adverse relief in connection with the consummation of the transactions
contemplated by this Agreement.

     8.3  TITLE DEFECTS/ACCOUNTING DEFECTS/CASUALTY LOSSES/ADVERSE ENVIRONMENTAL
CONDITIONS.  The total of the Purchase Price reductions (if any) which result
from the application of Section 10.4, Section 10.8, Section 17 or Section 19.6
                        ------------  ------------  ----------    ------------
hereof do not exceed ten percent (10%) of the Purchase Price.

     If any such condition to the obligations of Seller to be performed at
Closing under this Agreement is not met as of the Closing Date, this Agreement
may, at the option of Seller, be terminated.

9.   CONDITIONS PRECEDENT TO THE OBLIGATIONS OF BUYER.   The obligations of
Buyer to be performed at Closing are subject to the fulfillment (or waiver by
Buyer in its sole discretion) before or at Closing, of each of the following
conditions:

     9.1  REPRESENTATIONS AND WARRANTIES.   The Representations and Warranties
by Seller set forth in this Agreement shall be true and correct in all material
respects at and as of the Closing 

                                       8
<PAGE>
 
as though made at and as of the Closing; and Seller shall have performed and
complied with, in all material respects, all covenants and agreements required
to be performed and satisfied by Seller at or prior to the Closing.

     9.2  NO LITIGATION.   No suit, action or other proceedings shall, on the
date of Closing, be pending or threatened before any court or governmental
agency seeking to restrain, prohibit, or obtain substantial damages or other
material adverse relief in connection with the consummation of the transactions
contemplated by this Agreement.

     9.3  TITLE DEFECTS/ACCOUNTING DEFECTS/CASUALTY LOSSES/ADVERSE ENVIRONMENTAL
CONDITIONS.  The total of the Purchase Price reductions (if any) which result
from the application of Section 10.4, Section 10.8, Section 17 or Section 19.6
                        ------------  ------------  ----------    ------------
hereof do not exceed ten percent (10%) of the Purchase Price.

     If any such condition to the obligations of Buyer under this Agreement is
not met as of the Closing Date, this Agreement may, at the option of Buyer, be
terminated.

10.  TITLE MATTERS/ACCOUNTING DEFECTS.

     10.1 CERTAIN DEFINED TERMS.   As used in this Agreement, the following
terms have the following meanings:

          10.1.1 "Good and Defensible Title" means such title to the Properties
     that (a) entitles Seller to receive not less than the Net Revenue Interests
     in all oil, gas, condensate and related hydrocarbons produced from the
     Wells described in Exhibit A, and (b) obligates Seller to bear not more
                        ---------
     than the Working Interests in the Wells as set forth in Exhibit A (unless
                                                             ---------
     there is a corresponding increase in the Net Revenue Interests) and (ii) is
     free and clear of all liens and encumbrances, except for Permitted
     Encumbrances.

          10.1.2 "Title Defect" shall mean, with respect to Seller's title to
     the Properties, any lien, mortgage, claim, charge, defect, or other
     encumbrance which renders Seller's title to such Properties less than Good
     and Defensible Title.

          10.1.3 "Net Revenue Interest" shall mean Seller's interest in and to
     all production of oil, gas and other minerals saved, produced and sold from
     any Well after giving effect to all valid lessor's royalties, overriding
     royalties, production payments, carried interests, and other burdens on
     production therefrom.

          10.1.4 "Working Interest" shall mean, with respect to the Wells,
     Seller's share of the cost of exploring, drilling, developing and operating
     the Wells, and producing oil, gas and other minerals.

          10.1.5 "Permitted Encumbrances" shall mean:

                                       9
<PAGE>
 
               (a) Lessors' royalties, overriding royalties, reversionary
          interests and similar burdens if the net cumulative effect of the
          burdens does not operate to reduce Seller's Net Revenue Interest in a
          Well to less than the Net Revenue Interest for such Well set forth in
          Exhibit A or operate to increase Seller's Working Interest in such
          ---------
          Well to more than the Working Interest for such Well set forth in
          Exhibit A;
          --------- 

               (b) Division orders and sales contracts terminable without
          penalty upon no more than 90 days notice to the purchaser;

               (c) Preferential rights to purchase and required third party
          consents to assignment and similar agreements with respect to which
          waivers or consents are obtained from the appropriate parties, or the
          appropriate time period for asserting any such right has expired
          without an exercise of the right;

               (d) Materialman's, mechanic's, repairman's, employee's,
          contractor's, operator's, tax, and other similar liens or charges
          arising in the ordinary course of business for obligations that are
          not delinquent or that will be paid and discharged in the ordinary
          course of business or if delinquent, that are being contested in good
          faith by appropriate action of which Buyer is notified in writing
          before Closing;

               (e) All rights to consent by, required notices to, filings with,
          or other actions by governmental entities in connection with the sale
          or conveyance of oil and gas leases or interests therein if they are
          routinely obtained subsequent to the sale or conveyance;

               (f) Easements, rights-of-way, servitudes, permits, surface leases
          and other rights in respect of surface operations that do not
          materially interfere with the oil and gas operations to be conducted
          on any Well or Lease;

               (g) All operating agreements, unit agreements, unit operating
          agreements, pooling agreements and pooling designations affecting the
          Properties that are either of record in Seller's chain of title or
          reflected or referenced in Seller's files and which do not reduce the
          interest of Seller with respect to oil and gas produced from any Well
          below the Net Revenue Interest set forth in Exhibit "A" for such Well;
          or increase Seller's Working Interest in such Well to more than the
          Working Interest set forth in Exhibit "A" for such Well (unless there
          is a corresponding increase in the Net Revenue Interest);

               (h) Conventional rights of reassignment prior to release or
          surrender requiring notice to the holders of the rights;

               (i) All rights reserved to or vested in any governmental,
          statutory or public authority to control or regulate any of the
          Properties in any manner, and all applicable laws, rules and orders of
          governmental authority;

                                       10
<PAGE>
 
                (j) The terms and conditions of the Leases, and of all
          agreements that are of record in Seller's chain of title or reflected
          or referenced in Seller's files.

                (k) All other liens, charges, encumbrances, contracts,
          agreements, instruments, obligations, defects and irregularities
          affecting the Properties which individually or in the aggregate are
          not such as to interfere materially with the operation, value or use
          of any of the Properties, do not prevent Buyer from receiving the
          proceeds of production from any of the Wells, do not reduce the
          interest of Seller with respect to all oil and gas produced from any
          Well below the Net Revenue Interest set forth in Exhibit A for such
                                                           ---------
          Well or increase Seller's Working Interest in any such Well to more
          than the Working Interest set forth in Exhibit A for such well; and
                                                 ---------

                (l) Any Title Defects Buyer may have expressly waived in writing
          or which are deemed to have become Permitted Encumbrances under
          Section 10.2.
          ------------- 

          10.1.6 "Defect Property" shall mean any Property which is subject to a
     Title Defect.

          10.1.7 "Defect Value" shall mean the amount by which the Allocated
     Value of any Well is reduced as a result of a Title Defect.

          10.1.8 The "Allocated Value" of a Well shall be determined by
     reference to the portion of the Purchase Price which is allocated to said
     Well as set out in Exhibit C hereto.
                        ---------        

          10.1.9 "Required Consent" means any approvals, consents or waiver of
     preferential rights to purchase, other than Permitted Encumbrances,
     required to be obtained in connection with the conveyance of the Properties
     to Buyer at Closing.

          10.1.10 An "Accounting Defect" shall be deemed to have occurred if
     Seller's joint interest billings and/or revenue check details for the
     Properties for the twelve (12) months prior to the Effective Date or any
     gas contracts or processing agreements covering the Properties reflect that
     the actual costs of operating the Properties or the revenues generated from
     the sale of oil or gas from the Properties are different in any material
     respect from those set out in the reserve report delivered by Seller to
     Buyer, and such differences, if incorporated in the reserve report would
     result in reducing the future net revenues from the Properties.

     10.2  NOTICE OF TITLE DEFECTS.  In the event that Buyer shall identify any
Title Defect, as soon as possible after discovery, but in no event later than
ten (10) days prior to the Closing Date, Buyer shall notify Seller in writing of
any Title Defect.  Buyer's notice (a "Defect Notice") shall include (i) a
description of the Property affected by the Title Defect; (ii) a reasonably
adequate explanation of the basis for the Title Defect; and (iii) the amount by
which Buyer believes the value of the affected Property has been reduced by the
Title Defect.  Buyer's failure to give notice of a Title Defect within the time
required by this Section 10.2 shall be a waiver by Buyer of such Title Defect
                 ------------                                                
and such Title Defect shall be treated as a Permitted Encumbrance.

                                       11
<PAGE>
 
     10.3  REMEDIES FOR TITLE DEFECT.  Upon notice of a Title Defect, Seller
shall have the right, but not the obligation, until Closing, to cure the Title
Defect.  If Seller is unable or elects not to cure the Title Defect prior to
Closing, the Purchase Price shall be reduced pursuant to Section 10.4.
                                                         ------------ 

     10.4  VALUE OF TITLE DEFECTS.  If Seller is unable or elects not to cure a
Title Defect prior to Closing, the parties shall promptly meet and negotiate in
good faith to reach an agreement as to the value of each such Title Defect.  If
the parties reach an agreement as to the value of a Title Defect, then the
amount agreed upon shall be the Defect Value for such Title Defect.  If the
parties' negotiations fail to result in an agreement as to the value of any
Title Defect prior to Closing (or thereafter as the parties may agree), then the
question as to the value of the Title Defect shall be submitted to arbitration
in accordance with Section 33 of this Agreement; provided, however, that for
                   ----------                                               
purposes of Closing and Sections 8.3 and 9.3 hereof, an  amount equal to the
                        ------------     ---                                
average of Seller's and Buyer's estimate of the value of the Title Defect shall
apply unless Seller has failed to provide an estimate, in which event Buyer's
estimate of the value of the Title Defect shall apply; provided further, that
the value of a Title Defect affecting a Well shall never be in excess of the
Allocated Value of such Well.  Accordingly, at Closing the Purchase Price shall
be adjusted based on an estimate (determined as aforesaid) and the difference
between the estimated value of such Title Defect used for Closing and the final
value of the Title Defect, as decided by arbitration, shall be a post-Closing
adjustment item to be made pursuant to Section 13.1 hereof.
                                       ------------        

     10.5  CONVEYANCE OF DEFECT PROPERTIES.  If, at Closing, Title Defects with
respect to any Defect Properties have not been corrected by Seller or waived by
Buyer, then subject to the provisions of Sections 8.3 and 9.3 hereof, the
                                         ------------     ---            
Purchase Price shall be reduced by the value of such Title Defects and Seller
shall convey to Buyer those Defect Properties subject to partial title failures,
but Seller shall not be obligated to convey to Buyer any Defect Properties with
respect to which there has been complete title failure.

     10.6  ADDITIONAL DEFECT PROPERTIES.  If any Required Consent is not
obtained prior to Closing, Buyer may elect to treat that portion of the
Properties subject to such Required Consent as a Defect Property by giving
Seller notice thereof in accordance with the provisions of Section 10.2.
                                                           ------------ 

     10.7  NOTICE OF ACCOUNTING DEFECTS.  In the event that Buyer shall identify
any Accounting Defects, as soon as possible after discovery, but in no event
later than ten (10) days prior to the Closing Date, Buyer shall notify Seller in
writing of any Accounting Defect.  Buyer's notice shall include (i) a
description of the costs or revenues which Buyer believes were not properly
reflected in the reserve report, (ii) a reasonably adequate explanation of the
basis for the Accounting Defect, and (iii) the amount by which Buyer believes
the value of the Properties have been reduced by the Accounting Defect.  Buyer's
failure to give notice of an Accounting Defect within the time required by this
                                                                               
Section 10.7 shall be a waiver by Buyer of such Accounting Defect.
- ------------                                                      

     10.8  VALUE OF ACCOUNTING DEFECT.  The parties shall promptly meet and
negotiate in good faith to reach an agreement as to the value of each Accounting
Defect.  If the parties reach an agreement as to the value of an Accounting
Defect, then the Purchase Price shall be reduced by the amount agreed upon.  If
the parties negotiations fail to result in an agreement as to the value of any

                                       12
<PAGE>
 
Accounting Defect prior to Closing (or thereafter as the parties may agree),
then the value of the Accounting Defect shall be submitted to arbitration in
accordance with Section 33 of this Agreement; provided, however, that for
                ----------                                               
purposes of Closing and Sections 8.3 and 9.3 hereof, an amount equal to the
                        ------------     ---                               
average of Seller's and Buyer's estimate of the value of the Accounting Defect
shall apply unless Seller has failed to provide an estimate, in which event
Buyer's estimate of the value of the Accounting Defect shall apply.
Accordingly, at Closing the Purchase Price shall be adjusted based on an
estimate (determined as aforesaid) and the difference between the estimated
value of such Accounting Defect used for Closing and the final value of the
Accounting Defect, as decided by arbitration, shall be a post-Closing adjustment
item to be made pursuant of Section 13.1 hereof.
                            ------------        

11.  SUSPENSE FUNDS HELD BY SELLER.   Seller agrees to convey and Buyer agrees
to receive all suspense funds held by Seller as of the Effective Date for the
benefit of royalty, overriding royalty interest and working interest owners
attributable to the Properties, the amount of such funds to be adjusted with
respect to suspense funds received and disbursed by Seller from and after the
Effective Date, and Buyer shall assume all past, present and future liability
associated with such funds, but only as to the suspense funds actually
transferred, and not to any liability resulting from Seller's failure to pay or
retain any amounts prior to the Effective Date. All past, present and future
liability associated with such funds shall be assumed by Buyer and Buyer agrees
to protect, defend, indemnify and hold Seller and its employees harmless from
and against any and all costs, expenses, claims, demands, and causes of action
of every kind and character (including attorneys' fees and court costs) arising
out of, incident to, or in connection therewith.

12.  CLOSING.

     12.1  THE CLOSING.  The sale and purchase of the Properties pursuant to
this Agreement shall be consummated (the "Closing") in the offices of Seller on
or before December 23, 1996 (the "Closing Date").

12.2  CLOSING OBLIGATIONS.  At the Closing, the following events shall occur:
 
          12.2.1 Seller shall execute and deliver to Buyer one or more
     instruments of assignment, in substantially the form of the Assignment,
     Bill of Sale and Conveyance set forth as Exhibit D hereto.
                                              ---------        

          12.2.2 Buyer shall deliver to Seller in immediately available funds
     (wire transfer), the Preliminary Amount. The "Preliminary Amount" shall be
     that amount to be determined by Seller prior to the Closing Date as an
     estimate of the final computation of the Final Purchase Price. Seller shall
     provide Buyer a closing statement reflecting the Preliminary Amount at
     least two (2) business days prior to the Closing.


          12.2.3 Seller and Buyer shall execute, acknowledge and deliver
     division orders, transfer orders or letters in lieu thereof directing all
     purchasers of production from the Properties to make payment of proceeds
     attributable to such production occurring on or after the Effective Date to
     Buyer.

                                       13
<PAGE>
 
           12.2.4 Seller shall deliver to the Buyer possession of the Properties
     at the Closing.

13.  POST-CLOSING ADJUSTMENTS.

     13.1  FINAL SETTLEMENT STATEMENT. After the Closing Date, Seller shall
prepare, in accordance with this Agreement and with generally accepted
accounting principles consistently applied, a Final Settlement Statement, a copy
of which shall be delivered by Seller to Buyer no later than ninety (90) days
after the Closing Date. The "Final Settlement Statement" shall set forth each
adjustment to the Purchase Price necessary to determine the Final Purchase Price
(except those adjustments to be made pursuant to the provisions of Section 4.3
                                                                   -----------
hereof) and show the calculation of such adjustments in accordance with Section
                                                                        -------
4. The parties shall undertake to agree on the Final Settlement Statement and
- -                                                                            
the Final Purchase Price no later than one hundred twenty (120) days after the
Closing Date.

     13.2  ARBITRATION.   If Seller and Buyer cannot agree upon the Final
Settlement Statement, then the disputed matters shall be submitted to
arbitration pursuant to the provisions of Section 33 hereof.
                                          ----------        
     13.3  PAYMENT OF FINAL PURCHASE PRICE.  If the Final Purchase Price is more
than the Preliminary Amount, Buyer shall pay such difference to Seller in
immediately available funds within five (5) days after the parties have agreed
upon the Final Settlement Statement. If the Final Purchase Price is less than
the Preliminary Amount, Seller shall pay such difference to Buyer in immediately
available funds within five (5) days after the parties have agreed upon the
Final Settlement Statement.

14.  ASSUMPTION OF CERTAIN OBLIGATIONS.   Except as provided for in Section
                                                                    -------
19.6(a), at Closing, Buyer shall assume all costs and liabilities and discharge
- -------                                                                        
all obligations of Seller (a) under all leases, operating agreements, production
sales contracts, farmout agreements and other contracts or agreements respecting
the Properties or relating the ownership or operation of the Properties from and
after the Effective Date, and (b) with respect to all imbalances associated with
the Properties, regardless of their nature or of the time at which they accrued.

15.  LIMITATION OF WARRANTIES. Anything in this Agreement to the contrary
notwithstanding, the Properties are being sold by Seller to Buyer without
recourse, covenant, or warranty of any kind; express, implied, or statutory,
with the sole exception that Seller will warrant title to the Properties subject
to the Permitted Encumbrances, against every person whomsoever lawfully claiming
or to claim the same or any part thereof by, through, or under Seller, but not
otherwise.  WITHOUT LIMITATION OF THE GENERALITY OF THE IMMEDIATELY PRECEDING
SENTENCE, SELLER WILL CONVEY THE PROPERTIES AS-IS, WHERE-IS AND WITH ALL FAULTS,
AND EXPRESSLY DISCLAIMS AND NEGATES (a) ANY IMPLIED OR EXPRESS WARRANTY OF
MERCHANTABILITY, (b) ANY IMPLIED OR EXPRESS WARRANTY OF FITNESS FOR A PARTICULAR
PURPOSE, AND (c) ANY IMPLIED OR EXPRESS WARRANTY OF CONFORMITY TO MODELS OR
SAMPLES OF MATERIALS.  The representations and warranties made by Seller and
Buyer in Sections 5 and 6 shall survive Closing 
         ----------     -                                                     

                                       14
<PAGE>
 
for a period of six (6) months and shall thereafter be of no further force and
effect, excepting only matters as to which a written claim has been made prior
to the end of such six (6) month time period.

16.  CROSS-INDEMNIFICATION.   Except as expressly limited elsewhere in this
Agreement, in the event that Closing occurs hereunder:

          (a) Buyer agrees to indemnify and hold Seller harmless from and
     against any and all liability, loss, cost and expense (including, without
     limitation, court costs and reasonable attorneys' fees) that are
     attributable to the Properties conveyed to Buyer and are attributable to
     periods of time on or after the Effective Date; and

          (b) Subject to the provisions of Section 19 hereof, Seller agrees to
                                           ----------                         
     indemnify and hold Buyer harmless from and against any and all liability,
     loss, cost and expense (including, without limitation, court costs and
     reasonable attorneys' fees) that are attributable to the Properties
     conveyed to Buyer and are attributable to periods of time before the
     Effective Date;

          (c) The respective indemnity and hold harmless obligations of the
     parties hereto shall not apply to:

               (i)   any amount that was taken into account as an upward or
          downward adjustment to the Final Purchase Price pursuant to the
          provisions hereof, but only to the extent of such adjustments,

               (ii)  any liability of one Party hereto to any other Party under
          the provisions of this Agreement, or

               (iii) each Party's costs and expenses with respect to the
          negotiation and consummation of this Agreement and the purchase and
          sale of the Properties.

17.   CASUALTY LOSS.   Prior to Closing, Seller shall promptly notify Buyer of
any Casualty Loss of which Seller becomes aware. "Casualty Loss" shall mean,
with respect to all or any material portion of a Property, any destruction by
fire, blowout or other casualty (above or below the ground) or any taking, or
pending or threatened taking, in condemnation or under the right to eminent
domain of any Property or portion thereof. If any Casualty Loss occurs, Buyer
may elect to (a) cause Seller to retain the Property affected by the Casualty
Loss, and to reduce the Purchase Price by the Allocated Value of the Property,
in which case Seller shall retain all insurance proceeds relating to the
Casualty Loss, or (b) require Seller to (i) transfer to Buyer such Property
notwithstanding such Casualty Loss and (ii) transfer to Buyer such Property
insurance proceeds, claims, awards and other payments arising out of such
Casualty Loss.  In the event the aggregate of any such payments or reductions in
Purchase Price exceed  ten percent (10%) of the Purchase Price, then either
Seller or Buyer shall have the option to terminate this Agreement. Seller shall
not voluntarily compromise, sell or adjust any amounts payable by reason of any
Casualty Loss without first obtaining the written consent of Buyer.

                                       15
<PAGE>
 
18.  SOLE REMEDY OF BUYER PRIOR TO CLOSING.   If at any time prior to Closing,
any of the representations and warranties made herein by Seller are materially
incorrect or if Seller fails to fully and timely comply in any material respect
with any of Seller's obligations as set forth herein or as required by
applicable law, Buyer may elect to terminate this Agreement and in such event
Buyer's remedy against Seller shall be to obtain a return of the Deposit
(unless an alternative remedy shall be mutually agreed upon between Buyer and
Seller); provided, however, if Seller shall fail or refuse to comply with any of
its obligations under this Agreement, Buyer shall be entitled to enforce this
Agreement through the remedy of specific performance.

19.  ENVIRONMENTAL MATTERS

     19.1  PRESENCE OF WASTES, NORM, HAZARDOUS SUBSTANCES, AND ASBESTOS. Buyer
acknowledges that the Properties have been used to explore for, develop and
produce oil and gas, and that spills of wastes, crude oil, produced water,
hazardous substances, and other materials may have occurred thereon.
Additionally, the Properties, including production equipment, may contain
asbestos, hazardous substances, or Naturally Occurring Radioactive Material
("NORM"). NORM may affix or attach itself to the inside of wells, materials, and
equipment as scale or in other forms, and NORM-containing material may have been
buried or otherwise disposed of on the Properties. Special procedures may be
required for remediating, removing, transporting, and disposing of asbestos,
NORM, hazardous substances, and other materials from the Property, and Buyer
assumes all liability for the assessment, remediation, removal, transportation,
and disposal of these materials and associated activities in accordance with the
applicable rules, regulations, and requirements of governmental agencies, unless
otherwise provided in this Section 19.
                           ---------- 

     19.2  ADVERSE ENVIRONMENTAL CONDITION.   "Adverse Environmental Condition"
means (a) any contamination or condition exceeding allowed regulatory limits and
not otherwise permanently authorized by permit or law, resulting from any
discharge, release, disposal, production, storage, treatment, or any other
activities on, in or from any Property prior to the Effective Date, or the
migration or transportation from other lands to any Property, prior to the
Effective Date, of any wastes, pollutants, contaminants, hazardous materials or
other materials or substances subject to regulation relating to the protection
of the environment, including, but not limited to, the Clean Air Act, the
Comprehensive Environmental Response, Compensation and Liability Act of 1980,
the Federal Water Pollution Control Act, the Safe Drinking Water Act, the Toxic
Substance Control Act, the Hazardous and Solid Waste Amendments Act of 1984, the
Superfund Amendments and Reauthorization Act of 1986, the Hazardous Materials
Transportation Act, the Clean Water Act, the National Environmental Policy Act,
the Endangered Species Act, the Fish and Wildlife Coordination Act, the National
Historic Preservation Act, and the Oil Pollution Act of 1990, as well as any
state and local regulation or law governing the same, similar or related
matters, and (b) any such contamination or condition in existence prior to the
Effective Date temporarily authorized by permit, fee agreement or other
arrangement.

     19.3  ENVIRONMENTAL ASSESSMENT.   After the execution of this Agreement,
Buyer shall have the opportunity to conduct at its sole risk and expense an
environmental assessment of the Properties. Seller will provide reasonable
access for this purpose to Properties operated by Seller; for

                                       16
<PAGE>
 
any Property not operated by Seller, however, Buyer must contact the operator of
any such non-operated Property directly. Buyer or any of its representations and
agents must comply with Seller's environmental and safety rules and policies
while performing any environmental assessment on Seller-operated Properties.
Buyer agrees it will not disclose any information obtained in its environmental
assessment to third parties unless agreed to in writing by Seller or unless such
disclosure is expressly required by applicable law or regulation or is compelled
pursuant to legal process of any court or governmental authority. Buyer will
notify Seller in advance of any such disclosure and will furnish Seller copies
of all materials to be disclosed prior to any disclosure thereof to third
parties. As soon as possible after Buyer's receipt thereof, Buyer shall forward
to Seller copies of all reports, data, analysis, test results, remediation cost
estimates, and recommended remediation procedures or other information
concerning or derived from Buyer's environmental assessment.

     19.4  NOTICE OF ADVERSE ENVIRONMENTAL CONDITIONS.   Buyer shall notify
Seller in writing of any claimed Adverse Environmental Condition not less than
ten (10) days prior to the Closing Date (Environmental Defects Notice). The
Environmental Defects Notice shall (a) set forth in reasonable detail the Well
and/or Lease with respect to which a claimed Adverse Environmental Condition is
made, (b) the nature of such claimed Adverse Environmental Condition, and (c)
Buyer's proposed calculation of the cost to remediate each claimed Adverse
Environmental Condition (Remediation Value). Except as provided for in Section
                                                                       -------
19.7 hereof, Buyer shall waive its right to assert any claim or liability
- ----                                                                     
against Seller arising out of or in any way related to any Adverse Environmental
Condition not set forth in an Environmental Defects Notice delivered to Seller
not less than ten (10) days prior to the Closing Date.

     19.5  DETERMINATION OF ADVERSE ENVIRONMENTAL CONDITIONS AND REMEDIATION
VALUES. Within five (5) days after Seller's receipt of the Environmental Defects
Notice, Seller shall notify Buyer whether Seller agrees with Buyer's claimed
Adverse Environmental Conditions and/or the Remediation Value (Seller's
Environmental Response). If Seller does not agree with any claimed Adverse
Environmental Condition and/or the Remediation Value, then the parties shall
enter into good faith negotiations and shall attempt to agree on such matters.
If the parties cannot reach agreement concerning either the existence of an
Adverse Environmental Condition or the Remediation Value within ten (10) days
after Buyer's receipt of Seller's Environmental Response, then the matter shall
be submitted to arbitration pursuant to the provisions of Section 33 hereof and
                                                          ----------           
for purposes of Closing and Sections 8.3, 9.3 and 19.6 hereof, an amount equal
                            ------------  ---     ----                        
to Buyer's good faith estimate of the Remediation Value shall control.
Accordingly, at Closing, the Purchase Price shall be adjusted based upon an
estimate (as aforesaid) and the final value of the Remediation Value, as decided
by arbitration shall be a post Closing adjustment item to be made pursuant to
Section 13.1 hereof.
- ------------

     19.6   REMEDIES FOR ADVERSE ENVIRONMENTAL CONDITIONS. As to any Adverse
Environmental Condition, Seller (and Buyer with respect to subparagraphs (c) and
(d) below) shall have the election to:
 
            (a) remediate such Adverse Environmental Condition at Seller's sole
     cost in accordance with applicable environmental laws, and there shall be
     no adjustment to the 

                                       17
<PAGE>
 
     Purchase Price in respect of such Adverse Environmental Condition and the
     provisions of Section 19.8 below shall thereafter apply in all respects;
                   ------------                                              

          (b) reduce the Purchase Price by the applicable Remediation Value,
     which in no event shall exceed the Allocated Value of the Leases and/or
     Well affected by such Adverse Environmental Condition, in which event
     Seller shall have no other or further obligation or liability in respect of
     such Adverse Environmental Condition and the provisions of Section 19.8
                                                                ------------
     below shall thereafter apply in all respects;

          (c) delete from this Agreement the Property which contains the Adverse
     Environmental Condition and adjust the Purchase Price by the Allocated
     Value of such Property; or

          (d) in the event the aggregate sum of the Remediation Values exceeds
     ten percent (10%) of the Purchase Price, terminate this Agreement, in which
     case neither party shall have any further liability or obligation to the
     other hereunder except as regards obligations imposed by any
     confidentiality agreement, which shall survive such termination and be
     enforceable in accordance with the terms thereof.

If Seller elects (a) above, it will exercise all reasonable efforts and
diligence to complete remediation within six (6) months of the Closing Date, but
any failure to complete its efforts by such time shall not relieve Seller of its
duty to satisfy its obligation hereunder. Buyer shall allow Seller and its
agents and representatives such access to the Properties as is reasonably
necessary for performance of remediation work. Seller will conduct such work so
as not to unreasonably interfere with Buyer's or any designated operator's
operations.

     19.7   POST-CLOSING ADJUSTMENTS.  In addition to the rights granted to
Buyer above, Buyer shall have the right for a period of six (6) months following
Closing to provide Seller with written notice of any Adverse Environmental
Conditions with respect to the Properties which Buyer discovers subsequent to
the Closing.  The notice provided by Buyer to Seller of any such Adverse
Environmental Conditions shall contain the same information as is required to be
included in the Environmental Defects Notice as set out in Section 19.4 above.
                                                           ------------        
The Remediation Value of any such Adverse Environmental Conditions shall be
determined in the manner set out in Section 19.5 above. Within five (5) days of
                                    ------------
the final determination of the Remediation Value of any such Adverse
Environmental Condition, Seller shall advise Buyer in writing of whether Seller
elects to (a) remediate such Adverse Environmental Condition at its sole cost
and expense in the manner set out in Section 19.6(a) above or (b) pay to Buyer
                                     ---------------
an amount equal to the Remediation Value of such Adverse Environmental Defect;
provided, however, in no event shall Seller ever be liable to Buyer for Adverse
Environmental Conditions under this Section 19.7 in an aggregate amount in
                                    ------------
excess of $750,000. If Seller elects to pay Buyer for the Remediation Value of
an Adverse Environmental Condition, such payment shall be made to Buyer within
five (5) days of said election. Buyer shall absolutely and forever waive its
right to assert any claim or liability against Seller arising out of or in any
way related to any Adverse Environmental Condition as to which Buyer has not
provided written notice to Seller within six (6) months of Closing.

                                       18
<PAGE>
 
     19.8  BUYER'S INDEMNIFICATION OF ADVERSE ENVIRONMENTAL CONDITIONS.  Except
for the costs associated with Seller's remediation of any Adverse Environmental
Conditions pursuant to Section 19.6(a) above (which shall be completed to
                       ---------------                                   
Buyer's reasonable satisfaction at Seller's sole cost and expense as soon as
reasonably practical, but in no event later than one (1) year after the Closing)
and Sellers obligations under Section 19.7 hereof, in the event that Closing
                              ------------                                  
occurs hereunder, Buyer shall indemnify, defend and hold Seller harmless from
and against any and all claims, demands, causes of action, liabilities and
obligations, and all costs and expenses (including, without limitation,
reasonable attorneys' fees and court costs) associated with all Adverse
Environmental Conditions arising before or after the Effective Date, including,
without limitation, any such conditions arising out of or relating to any
discharge, release, disposal, production, storage, treatment or any activities
on, in or from the Properties, or the migration or transportation from any other
lands to the Properties, whether before or after the Effective Date, of
materials or substances that are at present, or become in the future, subject to
regulation under federal, state or local laws or regulations, whether such laws
or regulations now exist or are hereafter enacted, INCLUDING, WITHOUT
LIMITATION, ANY CLAIMS, DEMANDS, CAUSES OF ACTION, LIABILITIES, OR OBLIGATIONS
ARISING IN WHOLE OR IN PART FROM THE SOLE OR CONCURRENT NEGLIGENCE OR STRICT
LIABILITY OF SELLER. BUYER HEREBY RELEASES SELLER FROM AND AGAINST ANY AND ALL
CLAIMS FOR CONTRIBUTION UNDER CERCLA AND/OR ANY OTHER ENVIRONMENTAL LAW OR
REGULATION.

20.  DTPA WAIVER.   To the extent applicable to the transaction contemplated
hereby or any portion thereof, Buyer waives the provisions of the Texas
Deceptive Trade Practices Act, Chapter 17, Subchapter E, Sections 17.41 through
17.63, inclusive (other than Section 17.555 which is not waived) of the Texas
Business and Commerce Code.  In connection with such waiver, Buyer hereby
represents and warrants to Seller that Buyer (a) is in the business of seeking
or acquiring by purchase or lease, goods or services, for commercial or business
use, (b) has assets of $5,000,000 or more according to its most recent financial
statement, (c) has knowledge and experience in financial and business matters
that enable it to evaluate the merits and risks of the transaction contemplated
hereby, and (d) is not in a significantly disparate bargaining position.

21.  FURTHER ASSURANCES.   After the Closing, Seller and Buyer shall execute,
acknowledge and deliver, or cause to be executed, acknowledged and delivered,
such instruments and take such other action as may be reasonably necessary or
advisable to carry out their obligations under this Agreement and under any
exhibit, document, certificate or other instrument delivered pursuant hereto.
Seller shall use its best efforts to obtain all approvals and consents required
by or necessary for the transactions contemplated by this Agreement that are
customarily obtained after Closing, provided that Seller shall not be required
to expend any funds to obtain such approvals and consents.

22.  ACCESS TO RECORDS.  As soon as practicable after Closing, Seller shall
deliver to Buyer, at Seller's address, or at such other place as any of same may
be kept, the originals of all Data, except that Seller may retain the originals
of all Data which relates to properties other than the Properties being sold
herein, in which case Seller shall deliver duplicate copies of any such retained
originals to Buyer. For a period of six (6) years after the date of Closing,
Buyer will retain the Data delivered to it pursuant hereto and will make such
Data available to Seller upon reasonable notice at Buyer's 

                                       19
<PAGE>
 
headquarters at reasonable times and during office hours. Buyer shall notify
Seller in writing within thirty (30) days of the sale to a third party of all or
any part of the Properties which involves the transfer of any of the Data of the
name and address of the buyer(s) in any such sale. Buyer shall require as part
of any such sales transaction that such third party assume the obligations
imposed on Buyer in this Section 22.
                         ---------- 

23.  USE OF BUYER'S NAME.  Buyer agrees that, as soon as practicable after the
Closing, Buyer will remove or cause to be removed the names and marks "AVIVA",
"Aviva America, Inc.", and all variations and derivatives thereof and logos
relating thereto from the Properties of which it has assumed operations and will
not thereafter make any use whatsoever of such names, marks, and logos.

24.  NOTICES.  All notices required or permitted under this Agreement shall be
in writing and shall be delivered personally or by telecopier as follows:

Seller:   AVIVA AMERICA, INC.
          Suite 400 LB 84
          8235 Douglas Avenue
          Dallas, TX 75225
          Telephone: (214) 691-3464
          Fax/Telecopier: (214) 361-0010
          Attention: Mr. Ron Suttill, President

Buyer:    LOMAK PETROLEUM INC.
          125 State Route 43
          P.O. Box 550
          Hartville, Ohio  44632-0550
          Telephone:  (330) 877-0550
          Fax/Telecopier:  (330) 877-6129
          Attention: Jefferey A. Bynum, Vice President - Land

or to such other place within the United States of America as either Seller or
Buyer may designate as to themselves by written notice to the other. All notices
given by personal delivery or mail shall be effective on the date of actual
receipt at the appropriate address. Notice given by telecopier shall be
effective upon actual receipt if received during recipient's normal business
hours or at the beginning of the next business day after receipt if received
after the recipient's normal business hours. All notices by telecopier shall be
confirmed promptly after transmission, by mail or personal delivery.

25.  GOVERNING LAW.  This Agreement shall be governed by and construed in
accordance with the laws of the State of Texas.

26.  ASSIGNMENT.  This Agreement shall be binding upon and shall inure to the
benefit of the parties hereto; it shall not, however, be assignable by Buyer
without Seller's prior written consent, 

                                       20
<PAGE>
 
which consent shall not be unreasonably withheld in the event of a proposed
assignment to an affiliate which is financially capable of performing Buyer's
obligations under this Agreement.

27.  ENTIRE AGREEMENT; AMENDMENTS; WAIVERS.  This Agreement constitutes the
entire agreement between the parties hereto with respect to the subject matter
hereof, superseding all prior negotiations, discussions, agreements and
understandings, whether oral or written, relating to such subject matter. This
Agreement may not be amended and no rights hereunder may be waived except by a
written document signed by the party to be charged with such amendment or
waiver. No waiver of any of the provisions of this Agreement shall be deemed or
shall constitute a waiver of any other provisions hereto (whether or not
similar) nor shall such waiver constitute a continuing waiver unless otherwise
expressly provided.

28.  HEADINGS.  The headings of the articles and sections of this Agreement and
any listing of its contents are for guidance and convenience of reference only
and shall not limit or otherwise affect any of the terms or provisions of this
Agreement.

29.  COUNTERPARTS.  This Agreement may be executed by Buyer and Seller in any
number of counterparts, each of which shall be deemed an original instrument,
but all of which together shall constitute but one and the same instrument.

30.  EXPENSES, FEES AND TAXES.  Each of the parties hereto shall pay its own
fees and expenses incident to the negotiation and preparation of this Agreement
and consummation of the transactions contemplated hereby, including broker fees.
Buyer shall be responsible for the cost of all fees for the recording of
transfer documents. All other costs shall be borne by the party incurring them.
Notwithstanding anything to the contrary herein, it is acknowledged and agreed
by and between Seller and Buyer that the Purchase Price excludes any sales taxes
or other taxes in connection with the sale of property pursuant to this
Agreement. If a determination is ever made that a sales tax or other transfer
tax applies, Buyer shall be liable for such tax as well as any applicable
conveyance, transfer and recording fees, and real estate transfer stamps or
taxes imposed on any transfer of property pursuant to this Agreement. Buyer
shall indemnify and hold Seller harmless with respect to the payment of any of
such taxes, including any interest or penalties assessed thereon.

31.  LAWS AND REGULATIONS.  From and after the Closing, (a) Buyer shall comply
with all applicable laws, ordinances, rules and regulations and shall properly
obtain and maintain all permits required by public authorities with regard to
the Properties, and shall provide and maintain with the applicable regulatory
agency(ies) all required bonds, and (b) Buyer shall assume all of Seller's
obligations with regard to abandonment of all existing unplugged wells, whether
producing or nonproducing, and abandonment of the leasehold property including,
where applicable, the plugging of wells and the restoration of the surface as
completely as practicable and/or in compliance with all applicable laws, rules,
regulations and in compliance with all leases and other agreements affecting the
Properties, and shall indemnify and hold Seller harmless with respect to any and
all of those obligations. Such obligations shall survive the Closing and Buyer
shall remain liable therefor as regards Seller even if Buyer shall assign, sell
or transfer the Properties to a third party.

                                       21
<PAGE>
 
32.  CONFIDENTIALITY; PUBLIC ANNOUNCEMENTS.   The terms of this Agreement are
considered confidential to the parties hereto, and neither party may disclose
any of the terms of this Agreement to any third person prior to the Closing
without the prior written consent of the other party (which consent will not be
unreasonably withheld); provided that each party may disclose the terms of this
Agreement as required by applicable laws or the applicable rules and regulations
of any governmental agency or securities exchange, and the parties hereto may
disclose the terms of this Agreement to those of its and its affiliates'
employees, directors, attorneys, accountants, engineers and other consultants as
may be required in connection with the negotiation, evaluation and
implementation of this Agreement. Except as may be required by applicable laws
or the applicable rules and regulations of any governmental agency or securities
exchange, neither Buyer nor Seller shall issue any such press release or other
publicity without the prior written consent of the other party, which consent
shall not be unreasonably withheld.

33.  ARBITRATION.  Except as otherwise specifically provided herein, any
controversy under this Agreement shall be submitted to arbitration in Dallas,
Texas, in accordance with the Commercial Arbitration Rules of the American
Arbitration Association.  Upon written demand of either party, the parties shall
meet and attempt to appoint a single arbitrator.  If the parties fail to name an
arbitrator within ten (10) days from such demand, then the arbitrator(s) shall
be selected by the American Arbitration Association from the panels of
arbitrators of the American Arbitration Association.  The arbitrator(s) selected
to act hereunder shall be qualified by education and training to pass upon the
particular question in dispute and shall make a decision on the dispute within
thirty (30) days after his or their appointment, subject to any reasonable delay
due to unforeseen circumstances. The compensation and expenses of the
arbitrator(s) shall be borne equally by the parties.  Arbitration may proceed in
the absence of any party if notice of the proceedings has been given to such
party.  The parties agree to abide by all awards rendered in such proceedings.

34.  EXHIBITS.  The following Exhibits and Schedules are incorporated herein and
are a part hereof:

                                    EXHIBITS
                                    --------

                               Exhibit A - Wells
                               Exhibit B - Leases
                          Exhibit C - Allocated Values
          Exhibit D - Form of Assignment, Bill of Sale and Conveyance

                                   SCHEDULES
                                   ---------

                         Schedule 4.3 - Gas Imbalances
              Schedule 5.5 - Preferential Purchase Rights/Consents
                      Schedule 5.6 - Litigation and Claims
                    Schedule 5.15 - Outstanding Obligations

                                       22
<PAGE>
 
Executed as of the date set forth above.

SELLER

   AVIVA AMERICA, INC.

By: /s/ Ronald Suttill
   -------------------------------
Its: President
    ------------------------------

BUYER

   LOMAK PETROLEUM INC.


By: /s/ Jeffery A. Bynum
   -------------------------------
Its: Vice President
    ------------------------------

                                       23

<PAGE>
                                                                   EXHIBIT 10.60

                                                                               1

AGREEMENT No.              DIJ-1207
SUPPLIER      :            ARGOSY ENERGY INTERNATIONAL and NEO    
                           ENERGY, INC.
SUBJECT MATTER: SALE AND PURCHASE OF SANTANA CRUDE
TERM          :            FEBRUARY 1, 1997 TO DECEMBER 31, 1997
AMOUNT        :            INDEFINITE

     The Parties hereto, on one hand EMPRESA COLOMBIANA DE PETROLEOS
"ECOPETROL", hereinafter referred to as ECOPETROL, an industrial an commercial
State-owned corporation, duly authorized under the Act 165, 1948, and governed
by its bay-laws approved by the Decree 1209/94, with headquarters in the city of
Santafe de Bogota, D.C., duly represented by LUIS AUGUSTO YEPES G., of age,
bearing the Identity Card No. 19.125.070 issued in Bogota, domiciled in Bogota,
who herein states and declares: a.  That he acts in his capacity as Vice
President and duly vested with legal powers and internal Ecopetrol standards.-
b. That the execution of this Agreement has been authorized as stated in the
Memorandum CGI-0217; an on the other hand, ARGOSY ENERGY INTERNATIONAL, a
corporation organized and existing under Utah State, United States of America,
domiciled in Salt Lake, Utah State, with branch office in Colombia, incorporated
under the Public Indenture No. 5323, executed in the Notary Seven in Bogota on
October 
<PAGE>
                                                                               2

25, 1983 and filed with the Chamber of Commerce of Bogota, Registry No.
200848, on November 23, 1983, duly represented by SANTIAGO GONZALEZ ANGULO, of
age, bearing the ID # 5.584.373 from Barrancabermeja, and NEO ENERGY INC., a
corporation organized and existing under Texas State, United States of America,
domiciled in Dallas Tx., which branch office is established in Colombia,
incorporate under hhe Public Indenture No. 6.179 executed in the Notary Four in
Bogota, on October 23, 1986 and filed with the Chamber of Commerce of Bogota,
represented by WALDO E. CASAS, of age and bearing the Identity Card No. 126.688
from Bogota; above latter two companies hereinafter referred to as THE VENDOR,
who have entered into this Sale and Purchase Agreement of Santana Crude,
governed by the clauses below:  CLAUSE 1.-  SUBJECT MATER AND AMOUNT.  THE
VENDOR undertakes to sell and delivery ECOPETROL, under the condition hereunder,
crude oil produced under "Santana" Joint Venture agreement, corresponding to
VENDOR, in the amount and quality determined pursuant to provision in Clause 2
hereunder, which ECOPETROL undertakes to receive it and pay up.  PARAGRAPH 1:
"Santana" Joint Venture Agreement was entered into on May 27, 1987, with
effective 
<PAGE>
 
                                                                               3

date on July 27, 1987, between and by ECOPETROL and ARGOSY ENERGY INTERNATIONAL
and NEO ENERGY, INC. PARAGRAPH 2: All and any purchase shall be made by
ECOPETROL according to crude purchasing preliminary scheduling agreed upon by
the parties hereto for six (6) month periods, which ECOPETROL may change by
giving written notice to VENDOR no less than thirty (30) days in advance.
PARAGRAPH 3: Crude amounts the VENDOR will sale ECOPETROL shall be invoiced
separately by ARGOSY ENERGY INTERNATIONAL and NEO ENERGY, INC., according to
their participation in the Joint Venture Agreement, as follows: ARGOSY ENERGY
INTERNATIONAL, fifty five percent (55%) and NEO ENERGY, INC. forty five percent
(45%). CLAUSE 2: QUALITY.- Crude Quality subject matter of this Agreement shall
have the following specifications: a) Crude gravidity shall be that with such
crude is obtained through the operations carried out to the production thereof.
b) Water and sediment contents in the crude shall not be higher than 0.5% in
volume and the determination thereof will be made by using the methods ASTM-D95
"water in bearing-oil products and bituminous materials by distillation", last
revision, and ASTM-D473 "sediments in crude and combustoil by
<PAGE>
 
                                                                               4

extraction", last revision, respectively. c) Sulphur contents in crude shall be
that with which such crude is obtained through the operations carried out for
the production thereof; its determination will be made by using the ASTM-D2622
method, last revision "Ray-X sulphur analysis". d) Salt contents shall be > 20
                                                                          -  
lb/1000 crude oil barrels and the determination thereof will be made by the 
ASTM-D3230 method, "salts in crude (electrometric method)", last revision. 
When any of above parameters is not met, or otherwise the specifications 
above are not within the allowable range, ECOPETROL reserves the right to 
reject crude oil.  And, if ECOPETROL chooses to accept crude with salt 
contents higher than the specifications hereto, oil price shall be penalized 
according to table below:
<TABLE> 
<CAPTION> 
 
SALT CONTENTS           PENALIZATION       CHARGE ON
lb/1000 BLS.            USD/BARREL
<S>        <C>          <C>                <C>  
20.1        30.0        0.160              VENDOR
30.1        40.0        0.180              VENDOR
40.1        60.0        0.200              VENDOR
60.1        80.0        0.220              VENDOR
80.1       100.0        0.240              VENDOR
</TABLE> 
It shall be understood that VENDOR shall make its best efforts to deliver crude
oil hereunder, bearing a salt contents lower than twenty (20) lb. per 1000
barrels crude 
<PAGE>
 
                                                                               5

oil. e) Any variance related to quality specifications hereinbelow referred to,
acceptable for the parties hereto, should be included in a Record signed by
ECOPETROL and the VENDOR representatives. CLAUSE 3: DELIVERY SITE AND TITLE.-
Crude oil, subject matter of this Agreement shall be delivered by the VENDOR to
ECOPETROL in Santana Terminal, where Crude will be subsequently measured and
analyzed, from the standpoint above referred to, carried by ECOPETROL up to
Tumaco Terminal. The title to property and the risk will pass from the VENDOR to
ECOPETROL at the time when crude oil has passed through the outlet flange of the
measuring system located at Santana terminal. PARAGRAPH 1: Should Santana
Association will construct Santana-Orito Pipeline, measurement and transfer of
crude title shall be effective in Orito. Additionally, from such date on, crude
sale and purchase price will be changed, inasmuch as transportation rate from
Santana-Orito will be not taken into account, pursuant to Resolution 9035 of
February 18/94 from the Ministry of Mines and Energy. PARAGRAPH 2: Receipt
capacity of Santana Crude will be limited to Santana-Orito pipeline capacity
existing in this time. CLAUSE 4: TERM.- The initial term of this Agreement shall
<PAGE>
 
                                                                               6

be eleven (11) months from February 1, 1997 up to December 31, 1997 and may be
extended for one (1) year additional periods by written agreement between the
parties hereto, before the expiry date of this Agreement. CLAUSE 5: PRICE.- The
price ECOPETROL will pay the VENDOR for the Crude delivered in Santana terminal
shall be defined as follows: Price = base price more or less adjustment for
quality less transportation, less handling and marketing. PARAGRAPH 1: Base
price will the weighted average of export shipments invoiced by ECOPETROL during
each month. PARAGRAPH 2: Adjustment for quality to be applied in this Agreement
will be for API Gravity and sulphur contents which shall be computed on a
monthly basis according to the method described in Exhibit 1 hereto. PARAGRAPH
3: Santana-Tumaco carriage cost, as well as the relevant carriage tax shall
adhere the legal provisions then in force and will be subject to any amendment
of such provisions during the Agreement term. In line with provisions in
Resolution 9035 of February 18, 1994 from the Ministry of Mines and Energy,
Santana-Tumaco carriage rate as of Dec. 31, 1996 accounts up to 1.2434 USD/Bl;
carriage tax amount shall correspond to two percent (2%) of rate,
<PAGE>
 
                                                                               7

according provision in Sect. 17, Decree 2140/55, adopted as a permanent rule by
the Act. 10/61. Such tax shall be paid pursuant to privisioin in Act 141, 1994,
which as of January 31/97 is 0.0249 USE/Bl. Such rates, will be readjusted on a
yearly basis according to provisions in Resolution 9035 above referred to.
PARAGRAPH 4: Handling and marketing cost will be 0.515 USD/Bl. PARAGRAPH 5: If
during any month or consecutive months there is no crude export, the prior month
price will be applied. Such price will be adjusted the next month according to
new price computed for exports. Santana Crude volume received during the
corresponding month will be taken and the adjustment for quality will be
computed by using the average of quotations of basket crude corresponding to the
three months prior to the adjusted month. PARAGRAPH 6. If crude blend Tumaco
cabotages will occur (South Blend) to Cartagena Refinery sale and price
conditions ECOPETROL shall recognize to VENDOR, will the same obtained by the
International Manager Office, for crude blend received by Cartagena Refinery,
plus or minus the adjustment for quality, plus or minus the Santana-Tumaco
carriage cost and the relevant tax, less Tumaco-Cartagena carriage (value
<PAGE>
                                                                               8

invoiced by ECOPETROL), less handling and marketing (USD 0.415/Bl). For such
case, ECOPETROL shall adivise the VENDOR the mechanism to be used for price
reckoning agreed on with Cartagena Refinery.
CLAUSE 6: INVOICING AND PAYMENT CONDITIONS. VENDOR shall invoice ECOPETROL at
its office in Bogota, within ten (10) first days of each month, the VENDOR-owned
crude oil delivered to ECOPETROL during the latter month, after deducing the
volume corresponding to royalties, contributions, and participation. Within
seven (7) days of the term above referred to, ECOPETROL shall provide the VENDOR
with the data required by the VENDOR to make the relevant invoicing. Payment
shall be made on a monthly basis thirty (30) days following the date of the
invoice receipt by ECOPETROL, after making the appropriate legal withholding, if
any. Twenty five percent (25%) of the value shall be paid in Colombian currency
and seventy five percent (75%) shall be paid in US Dollars. Invoicing shall be
make upon the basis of net volume, water and sediment free, corrected at 60
degrees F. For Colombian currency portion the relevant market exchange rate
shall be used, as certificated by Bank Superintendency, computed as the
<PAGE>
                                                                               9

arithmetic average corresponding to Crude deliveries. PARAGRAPH 1: In the
event of arrears to pay the portion payable in dollars, over invoices not timely
challenged by ECOPETROL, ECOPETROL shall pay VENDOR, as interest payable in USD,
the rate equivalent to "Prime Rate" as stated by Chase Manhattan Bank of New
York, during the days of the effective arrears plus 2.0%. In the event of
arrears to pay the portion payable in Colombian currency, over the respective
amount in Col$, ECOPETROL shall pay the maximum interest, according to a
certificate from Bank Superintendency. Invoices to collect dollars or pesos
interest shall be paid within ten (10) days following the receipt of the invoice
by ECOPETROL. PARAGRAPH: Should ECOPETROL has not USD available and of free
disposal, or otherwise cannot obtain USD from the Colombian Government or the
authorized agencies thereof, to pay oil purchases hereunder, ECOPETROL shall
timely notice the VENDOR, without prejudice of the conditions set forth in
Paragraph 1, hereinabove, and the parties hereto shall have available thirty
(30) calendar days, from ECOPETROL notice, to mutually agree upon to reach to
and agreement. PARAGRAPH 3: ECOPETROL shall have fifteen (15) business days to
<PAGE>
 
                                                                              10

review, amend or otherwise challenge the invoices submitted by the VENDOR. Any
invoice which has not been challenged within such term shall be deemed as
conclusive and correct. Any adjustment or amendment to be made to the invoice
shall become the valid date the effective date of the amendment or adjustment
before ECOPETROL. ECOPETROL shall, within the provided term, advise the VENDOR
about any invoice challenged, for it to be adjusted and amended, clearly
specifying the items to be amended or corrected, and the reasons thereof. CLAUSE
7: INSPECTION AND MEASURING.- For the purposes set forth in Clause 2 hereto,
determination of quality shall be made as per operative procedures mutually set
forth by the parties hereto according to a written Record. Either party may,
from time to time, appoint an independent inspector for him/her to certify both
quantity and quality, make tank appraisal or volume instruments gauging. Cost
shall be fifty-fifty borne by ECOPETROL and the VENDOR. CLAUSE 8: TERMINATION.
VENDOR or ECOPETROL may terminate this Sale and Purchase Agreement by giving
notice with sixty (60) days before expiry term of Santana Crude Export
Agreement. If VENDOR makes the decision to directly export its Santana Crude, it
<PAGE>
 
                                                                              11

shall advise in writing the PURCHASER, sixty (60) days in advance, and within
such term ECOPETROL and VENDOR may terminate this Agreement. CLAUSE 9:
DESTINATION -ECOPETROL may give crude oil purchased the destination as it deems
suitable to its interests, provided however such destination will be allowed by
the legal in force provisions applicable in that time. CLAUSE 10: ASSIGNMENT.-
Neither Party hereto may assign, sell, or otherwise transfer the entire or any
portion of their rights or obligations hereunder, to a third party, without
prior and written consent of the other party. CLAUSE 11: FORCE MAJEURE.- Neither
ECOPETROL nor the VENDOR will be liable of unfulfillment of all or any of the
obligations hereunder, if such unfulfillment results from any event of force
majeure or casus fortuitus duly documented. Force majeure shall not release
ECOPETROL the obligation to pay the VENDOR those invoices on account of crude
sale already delivered by VENDOR to ECOPETROL, as provided in Clause 7
hereunder. CLAUSE 12: COLOMBIAN LAWS GOVERNING THIS AGREEMENT.- For any and all
purposes of this Agreement, parties hereto assign as domicile the city of
Santafe de Bogota, D.C., Republic of Colombia. This Agreement shall
<PAGE>
 
                                                                              12

be governed by the Colombian laws, and the parties hereto shall subject to
Colombian Courts venue and waive to any diplomatic claim concerning their rights
and obligations hereunder, with the exception of justice denial. For all and any
effects of this Agreement, it shall be understood incorporated in this
Agreement, the provisions of Sect. 25, Act 40/93, and Chap. 2, Title III, Act
104/93, as amended. CLAUSE 13.- NOTICES.- Any notice related to, or connected
with this Agreement shall make reference to this Clause and to the appropriate
Clause. Such notices shall be forwarded via registered mail, telex, or otherwise
delivered in the address below, and shall be considered received in the
appropriate address in the date appearing in the letter receipt or otherwise in
the date the telex was sent:

If to Empresa Colombiana de Petroleos -ECOPETROL:
Carrera 13 # 36-24, A.A. 59-38, Telex No. 44787
Attn. Vicepresidencia de Comercio Internacional y Gas

If to VENDOR:

ARGOSY ENERGY INTERNATIONAL

Avenida 13 (Autopista Norte) No. 122-56 Piso 4-5
Facsimile: 6195480, Santafe de Bogota, D.C.
Attn. Santiago Gonzalez A., President
<PAGE>
 
                                                                              13

and

NEO ENERGY, INC
Avenida 13 (Autopista Norte) # 122-56 Piso 4-5
Santafe de Bogota, D.C.
Attn.: Waldo E. Casas, Legal Representative.

Any address change shall be advised in writing and in advance to the other
party. CLAUSE 14.- TAX AND EXPENSES.- Any tax and expenses incurred in for this
Agreement execution and extensions/amendments thereof, shall be borne only by
the VENDOR. CLAUSE 15: DISCREPANCIES: A) Should any discrepancy between the
parties hereto will arise related to construction and performance of this
Agreement, which cannot amicably settle, shall be subject to jurisdictional
branch of the public Colombian power. B) Any in fact of technical in nature
discrepancy which may arise between the parties hereto, by reason of
construction or application of this Agreement, which cannot settle by mutual
agreement, shall be subject to an arbitration award appointed as follows: One
arbiter appointed by each party and the third arbiter appointed by mutual
agreement by the two arbiters mutually appointed by the parties hereto. If the
two arbiters do not reach to an agreement to appoint the third arbiter,
<PAGE>
 
                                                                              14

then the third arbiter shall be appointed, at the request of either party, by
the Board of Director of the Sociedad Colombiana de Ingenieros, with
headquarters in Santafe de Bogota, D.C. C) Any accounting in nature discrepancy
which may arise among the parties by reason of construction and performance of
this Agreement, which cannot amicably settled, shall be subject to arbiter
award, who shall be Registered Accountants, as follows: One (1) appointed by
each party, and the third arbiter appointed by the two arbiters appointed by the
parties. In default of agreement between the two arbiters, and at the request of
either party hereto, such third arbiter shall be appointed by the Junta Central
de Contadores de Bogota, and in default thereof, by Sociedad Colombiana de
Ingenieros. D) Both parties hereto declare and accept that arbiters' award shall
have all and any effect of a transaction between the parties hereto, and hence,
such award shall be conclusive. E) If any discrepancy will arise between the
parties hereto, concerning technical, accounting, or legal nature of the
dispute, such discrepancy shall be considered as legal and literal A) of this
Clause shall be applied. The agreement reached by the parties as provided in
this Clause
<PAGE>
                                                                              15

shall be understood without prejudice of the special procedures provided in this
Agreement.

IN WITNESS WHEREOF, this Agreement have been signed up this 10th day of
February, 1997, in documentary paper of ECOPETROL, which sheets bear the numbers
0003188 and 0003195 for original and counterparts thereof.


EMPRESA COLOMBIANA DE PETROLEOS -ECOPETROL

/s/ LUIS AUGUSTO YEPES G.
Vice-President

ARGOSY ENERGY INTERNATIONAL                     NEO ENERGY, INC
/s/ SANTIAGO GONZALEZ ANGULO                 /s/ WALDO E. CASAS
Legal Representative                       Legal Representative
<PAGE>
                                                                              16

                                   EXHIBIT 1

                COMPUTATION ADJUSTMENT FOR QUALITY COMPENSATION

Adjustment procedure for quality shall be applied on a monthly basis for
deliveries of the prior month, according to the method below.

DATA REQUIRED:

 .    Regression Equation to compute reference prices according to information
     example furnished at the end of the current month.

 .    Volume and quality (API and %wtS) of crude blend shipment(s) taken out
     Tumaco Terminal to be exported.

 .    Volume and quality (API and %wtS) of Santana Crude delivered in Santana
     terminal, as well as the volume of deliveries in Mary, Miraflor, Toroyaco
     and Linda fields.

 .    Value of base price crude blend delilvered in Tumaco, to be exported.

PROCEDURE

1.   To reckon reference prices of crude blend taken away from Tumaco and
     Santana crude delivered in Santana 
<PAGE>
 
                                                                              17

     Terminal, by using regression equation
     according to the relevant quality.

2.   With volumes of crude blend taken away in Tumaco and Santana crude
     delivered in Santana terminal, and the reference prices prior calculated,
     calculate value in USD of each.

3.   Calculate fraction of Santana crude in crude blend dividing USD of Santana
     crude by USD crude blend.

4.   Calculate Santana crude volume compensated, multiplying crude blend volume
     taken away in Tumaco by the fraction value of Santana crude.

5.   Calculate compensation factor of Santana crude dividing compensated value
     of Santana crude by Santana crude volume delivered in Santana terminal.

6.   Calculate compensation value as follows:

Compensation value=base price*(compensation factor less 1) Base price shall be
export value of crude blend FOB Tumaco. Example: All information given below is
by way of example.

Information required:

1.   Regression equation: Price = Bo + B1* SG + B2* %wtS

- ----------------------------------------------- 
B2 = -0.7995    B1 = -3.8822    Bo = 20.1712
- ----------------------------------------------- 
<PAGE>
 
                                                                              18

Where:
Bo   = Independent term
B1   = Regression coefficient associated to specific gravidity
SGR  = Crude specific gravity
B2   = Regression coefficient associated to percent of sulphur weight
%wtS = Percent of crude sulphur weight

2.   Crude blend taken away in Tumaco terminal:
     Volume: 400.000 net barrels
     Quality:  28.90(degrees)API (0.882 SGR), 0.790 %S
     Base price of crude blend delivered in Tumaco: 16.0000 USD/barrel

3.   Santana Crude delivered in Santana terminal:
     Volume: 150.000 net barrels
     Quality: 26.50(degrees)API (0.896 SGR)
     Sulphur contents is derived as the average of sulphur contents in crude of
     Mary, Miraflor, Linda, and Toroyaco fields weighted by the volume delivered
     per field, as follows:
<PAGE>
                                                                              19
<TABLE> 
<CAPTION> 

- -----------------------------------------------------------------  
      CRUDE                  % WEIGHT OF S     FIELD DELIVERIES
     (FIELDS)                                      Barrels
- ----------------------------------------------------------------- 
<S>                               <C>              <C> 
MARY                              0.579            81.661
- ----------------------------------------------------------------- 
MIRAFLOR                          0.644            13.454
- ----------------------------------------------------------------- 
LINDA                             0.481             3.766
- ----------------------------------------------------------------- 
TOROYACO                          0.527            60.164
- ----------------------------------------------------------------- 
TOTAL DELIVERIES                                        159.045
- ----------------------------------------------------------------- 
WEIGHTED SULPHUR CONTENTS                                 0.550
- ----------------------------------------------------------------- 
</TABLE> 
Sulphur quality: 0.550 %S

Note:  Sulphur contents of the several different fields is that supplied by
          Ecopetrol Technical Division, which, for such purposes will hire an
          independent inspection firm and the expenses shall be borne fifty-
          fifty Ecopetrol and the VENDOR.

CALCULATION METHOD:

1.   Replacing in the regression equation the quality of each crude.

Crude blend price = 20.1712 + (-3.8822)* 0.882 +
(-0.7995)* 0.790 = 16.1155 USD/Bl.

Santana Crude price = 20.1712 + (-3.8822)* 0.896
+ (-0.7995)* 0.550 = 16.2530 USD/Bl.
<PAGE>
                                                                              20

2.   Value in USD each crude

Crude blend = Volume* Price = 400.000 Bls* 16.1155 USD/Bl = USD6.446.200.00.
Santana Crude = Volume* Price = 150.000 Barrels* 16.2530 USD/Bl =
USD2.437.950,00.

3.   Santana crude fraction in crude blend.
     2.437.950,00/6.446.200,00 = 0.3782

4.   Santana Crude compensated volume
     400.000 Bls* 0.3782 = 151.250 Bls.

5.   Santana Crude compensation factor
     151.280.00 Bls/150.000,00 Bls = 1.0085

6.   Compensation value = 16.00 USD/Bl* (1.0085 -1)
     = 0.1360 USD/Bl.

INFORMATION ON REGRESSION EQUATION

To calculate regression equation the table below of 14 international crude is
used.  Prices of such crude correspond to arithmetic average of the quotation in
the three months prior to quality compensation appraisal.  Such information,
both of price and quality, shall be derived from the public monthly report
issued by Platt's, and named as follows:  "PLATTs OIL GRAM PRICE REPORT". Table
of 14 international crude is as follows:
<PAGE>
                                                                              21
<TABLE> 
<CAPTION> 
                                                     PRICE 
                                                     (USD/Bl
- --------------------------------------------------------------
CRUDE                 API         SGR       %wts     MONTH X 
                                                     YEAR X
- --------------------------------------------------------------
<S>                  <C>          <C>       <C>         <C> 
FATAH                30.70        0.8724    1.90        21.50
- --------------------------------------------------------------
ARAB LIGHT           33.40        0.8581    0.17        22.53
- --------------------------------------------------------------
ARAB                 28.50        0.8844    2.85        21.55
MEDIUM
- --------------------------------------------------------------
ARAB HEAVY           27.40        0.8905    2.80        20.79
- --------------------------------------------------------------
BRENT                38.00        0.8348    0.30        24.04
BLEND
- --------------------------------------------------------------
BONNY                35.70        0.8463    0.14        24.01
LIGHT
- --------------------------------------------------------------
CANO LIMON           29.50        0.8789    0.45        24.45
- --------------------------------------------------------------
FORCADOS             31.00        0.8708    0.20        24.06
- --------------------------------------------------------------
FLOTA                36.00        0.8448    1.20        23.49
BLEND
- --------------------------------------------------------------
ISTHMUS              33.00        0.8602    1.30        23.16
- --------------------------------------------------------------
KUWAIT               31.40        0.8686    2.52        21.26
- --------------------------------------------------------------
MANDJI               30.50        0.8735    1.10        22.08
- --------------------------------------------------------------
MAYA                 22.00        0.9218    3.40        19.83
- --------------------------------------------------------------
EAST                 29.50        0.8789    0.90        22.06
- --------------------------------------------------------------
</TABLE> 
Above international crude basket can be changed by mutual agreement between the
parties hereto.

NOTA 1:
<PAGE>
 
                                                                              22

When crude quality of the basket will vary during any month, the average of the
three quality values corresponding to the same months where quotations shall be
taken.

NOTA 2:

When in some month there is no quotation of any crude of the basket, the average
of the two prior months shall be taken instead of the three quotations taken for
price calculation of that month, and between the parties shall agree on in
writing if basket will definitely be reduced or by which other crude will be
replaced to calculate the price for the next price.
<PAGE>
 
                                                                              23


This is a fair and accurate English translation of the original document which
is in the Colombian language.

                                                /s/ James L. Busby
                                                --------------------------------
                                                James L. Busby
                                                Secretary and Treasurer
                                                of Aviva Petroleum Inc.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET OF AVIVA PETROLEUM INC. AND SUBSIDIARIES AS OF
DECEMBER 31, 1996 AND THE RELATED CONSOLIDATED STATEMENT OF OPERATIONS FOR THE
YEAR ENDED DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                           2,041
<SECURITIES>                                         0
<RECEIVABLES>                                    3,750
<ALLOWANCES>                                         0
<INVENTORY>                                        721
<CURRENT-ASSETS>                                 6,794
<PP&E>                                          58,937
<DEPRECIATION>                                  23,991
<TOTAL-ASSETS>                                  42,944
<CURRENT-LIABILITIES>                            9,408
<BONDS>                                          5,210
                                0
                                          0
<COMMON>                                         1,574
<OTHER-SE>                                      24,656
<TOTAL-LIABILITY-AND-EQUITY>                    42,944
<SALES>                                         13,750
<TOTAL-REVENUES>                                13,750
<CGS>                                           12,173
<TOTAL-COSTS>                                   12,173
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 814
<INCOME-PRETAX>                                    (26)
<INCOME-TAX>                                       911
<INCOME-CONTINUING>                               (937)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      (937)
<EPS-PRIMARY>                                    (0.03)
<EPS-DILUTED>                                        0
        

</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission