PETSEC ENERGY INC
8-K, 1999-02-12
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1


                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM 8-K


                 CURRENT REPORT PURSUANT TO SECTION 13 OR 15(D)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

       DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): FEBRUARY 1, 1999


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


                               PETSEC ENERGY INC.
             (Exact name of registrant as specified in its charter)


             NEVADA                       333-31625*            84-1157209
   (State or other jurisdiction        (Commission File      (I.R.S. Employer  
 of incorporation or organization)          Number)         Identification No.)




      143 RIDGEWAY DRIVE, SUITE 113
      LAFAYETTE, LOUISIANA                                      70503
   (Address of principal executive offices)                   (Zip code)


       Registrant's telephone number, including area code: (318) 989-1942

*Petsec Energy Inc. is a wholly owned operating subsidiary of Petsec Energy
Ltd, a listed Australian public company registered with the Commission as a
result of its public offering in July 1996 of American Depositary Receipts
("ADRs") which are listed on the New York Stock Exchange (symbol: PSJ).


<PAGE>   2

Item 2.    Acquisition or Disposition of Assets.

           On February 1, 1999, Petsec Energy Inc. ("PEI") completed the sale
of a one-half (50%) interest in certain of its oil and gas properties to Apache
Corporation ("Apache"), an unaffiliated purchaser. In consideration of the
sale, PEI received approximately US$68.3 million cash from Apache. The
effective date of the transaction was January 1, 1999. PEI had entered into a
previously announced definitive agreement with Apache with respect to the sale.

           One-half (50%) of PEI's mineral interests, together with one-half
(50%) of related facilities and equipment, were sold in the following 23
mineral leases: OCS-G 16461 covering all of Grand Isle Block 45; OCS-G 19853
covering all of Main Pass Block 90; OCS-G 19854 covering a portion of Main Pass
Block 91; OCS-G 14576 covering a portion of Main Pass Block 91; OCS-G 19855
covering a portion of Main Pass Block 93; OCS-G 13960 covering all of Main Pass
Block 104; OCS-G 19857 covering all of Main Pass Block 105; OCS-G 16390
covering all of Ship Shoal Block 192; OCS-G 13917 covering all of Ship Shoal
Block 193; OCS-G 15288 covering all of Ship Shoal Block 194; OCS-G 13896
covering all of South Marsh Island Block 7; OCS-G 2833 covering all of West
Cameron Block 237; OCS-G 03970 covering all of West Cameron Block 542; OCS-G
12802 covering all of West Cameron Block 543; OCS-G 14342 covering all of West
Cameron Block 544; OCS-G 17827 covering all of West Cameron Block 653; State of
Louisiana Lease 13580 covering a portion of Main Pass Block 6; State of
Louisiana Lease 13890 covering a portion of Main Pass Block 5; State of
Louisiana Lease 13891 covering a portion of Main Pass Block 6; State of
Louisiana Lease 13892 covering a portion of Main Pass Block 7; State of
Louisiana Lease 3771 covering a portion of Main Pass Block 6; State of
Louisiana Lease 3773 covering a portion of Main Pass Block 7; and State of
Louisiana Lease 14680 covering a portion of Main Pass Block 84.


Item 7.    Financial Statements and Exhibits.

(b)        Pro Forma Financial Information.

           1.   Unaudited Pro Forma Balance Sheet at September 30, 1998 

           2.   Unaudited Pro Forma Statements of Operations for Year Ended 
                December 31, 1997 and Nine Months Ended September 30, 1998.

(c)        Exhibits.

           2.1   Purchase and Sale Agreement dated January 15, 1999 between 
                 Petsec Energy Inc., as Seller, and Apache Corporation, 
                 as Buyer.

           99.1  Press Release dated February 1, 1999 of Petsec Energy Ltd 
                 announcing completion of sale.


<PAGE>   3


                                                              SIGNATURES

           Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                          PETSEC ENERGY INC.



Date: February 12, 1999                   By: /s/ ROSS A. KEOGH
                                             ---------------------------------
                                             Name:  Ross A. Keogh
                                             Title: Vice-President--Finance 
                                                    and Administration


<PAGE>   4






                               PETSEC ENERGY INC.
                    UNAUDITED PRO FORMA FINANCIAL STATEMENTS

Introduction

           The following unaudited pro forma financial statements give effect
to the sale to Apache Corporation of a 50% working interest in PEI's oil and
gas properties described above for cash consideration of $68.3 million. The
sale was effective January 1, 1999.

           The unaudited pro forma financial statements should be read in
conjunction with the historical financial statements of PEI and accompanying
notes. This pro forma information is presented for illustration purposes only
and is not necessarily indicative of the results which actually would have been
achieved if the Apache sale had been effected on the pro forma dates, nor is it
necessarily indicative of future results.

           The Unaudited Pro Forma Balance Sheet at September 30, 1998 assumes
that the Apache sale was effected on that date. The Unaudited Pro Forma
Statements of Operations for the year ended December 31, 1997 and for the nine
months ended September 30, 1998 assume the sale occurred January 1, 1997.















                           [INTENTIONALLY LEFT BLANK]

<PAGE>   5


                               PETSEC ENERGY INC.
                 A WHOLLY OWNED SUBSIDIARY OF PETSEC ENERGY LTD
                       UNAUDITED PRO FORMA BALANCE SHEET
                               SEPTEMBER 30, 1998
                  (DOLLARS IN THOUSANDS, EXCEPT SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                                                                         PRO FORMA
                                                                       HISTORICAL     ADJUSTMENTS(A)       PRO FORMA
                                                                    --------------    --------------    -------------
<S>                                                                <C>               <C>               <C>

ASSETS   
Current Assets:
    Cash                                                            $          916    $       3,300     $       4,216
    Accounts receivable                                                      5,297                              5,297
    Other receivables                                                          261                                261
    Inventories of crude oil                                                    21                                 21
    Prepaid expenses                                                           480                                480
                                                                    --------------    -------------     -------------

            Total Current Assets                                             6,975            3,300            10,275

Property, plant and equipment - at cost under the successful
    efforts method of accounting for oil and gas properties
    Proved oil and gas properties                                          290,516         (143,293)          147,223
    Unproved oil and gas properties                                         34,078           (3,760)           30,318
    Production facilities                                                   76,467          (25,276)           51,191
    Other                                                                    1,950                              1,950
                                                                    --------------    -------------     -------------

                                                                           403,011         (172,329)          230,682
    Less accumulated depletion, depreciation and amortization             (156,217)          75,066           (81,151)
                                                                    --------------    -------------     -------------
    Net property, plant and equipment                                      246,794          (97,263)          149,531
                                                                    --------------    -------------     -------------
Other Assets                                                                 2,761                              2,761
                                                                    --------------    -------------     -------------

            TOTAL ASSETS                                            $      256,530    $     (93,963)    $     162,567
                                                                    ==============    =============     =============

LIABILITIES AND SHAREHOLDER'S EQUITY 
Current Liabilities:
    Trade accounts payable                                                  11,806                             11,806
    Interest payable                                                         3,901                              3,901
    Other accrued liabilities                                                4,339                              4,339
    Bank credit facility                                                     8,250           (8,125)              125
                                                                    --------------    -------------     -------------

            Total Current Liabilities                                       28,296           (8,125)           20,171

Senior subordinated notes                                                   99,649                             99,649
Bank credit facility                                                        57,750          (56,875)              875
Subordinated shareholder loan                                               36,624                             36,624
Provision for dismantlement                                                  4,183           (1,952)            2,231
Deferred income taxes                                                        3,379           (3,379)                0
                                                                    --------------    -------------     -------------

            Total Liabilities                                       $      229,881    $     (70,331)    $     159,550
                                                                    --------------    -------------     -------------
Shareholder's Equity:
    Common stock, $1 par value;  authorized
         1,000,000 shares; issued and outstanding 1 share                       --                                 --
    Additional paid-in-capital                                              21,489                             21,489
    Retained earnings (deficit)                                              5,160          (23,632)          (18,472)
                                                                    --------------    -------------     -------------
            Total Shareholder's Equity                                      26,649          (23,632)            3,017
                                                                    --------------    -------------     -------------

            Total Liabilities and Shareholder's Equity              $      256,530    $     (93,963)    $     162,567
                                                                    ==============    =============     =============
</TABLE>

Notes to Unaudited Pro Forma Balance Sheet:
(A) To record the sale of a 50% interest in oil and gas properties to Apache
    Corporation and the use of most of the proceeds of the sale to repay bank
    credit facility. In the fourth quarter of 1998, borrowings under the Bank
    Credit Facility increased by $8 million. Pro Forma adjustments also include
    reductions in provisions for dismantlement and deferred income taxes.

<PAGE>   6

                               PETSEC ENERGY INC.
                 A WHOLLY OWNED SUBSIDIARY OF PETSEC ENERGY LTD
                  UNAUDITED PRO FORMA STATEMENTS OF OPERATIONS
                             (DOLLARS IN THOUSANDS)


<TABLE>
<CAPTION>
                                       YR. ENDED      PRO FORMA        PRO FORMA     9 MONTHS      PRO FORMA        PRO FORMA
                                        Dec. 31          Adj.           Dec. 31      Sept. 30         Adj.          Sept. 30
                                          1997                           1997          1998                           1998
                                       ---------      ---------        ---------    ----------     ---------        --------
<S>                                   <C>            <C>              <C>          <C>            <C>              <C>        
Revenue:
    Oil and gas sales                  $ 125,139      $ (57,199)(A)    $  67,940    $   72,171     $ (32,191) (A)   $ 39,980
                                       ---------      ---------        ---------    ----------     ---------        --------
Operating Expenses:
    Lease operating expenses              10,825         (5,154)(A)        5,671        10,477        (4,828) (A)      5,649
    Production taxes                         702           (351)(A)          351           479          (239) (A)        240
    Exploration expenditures               7,329           (630)(A)        6,699         6,515          (927) (A)      5,588
    Dry hole costs and impairments        10,453         (4,092)(A)        6,361        36,225          (146) (A)     36,079
    General and administrative             6,054                           6,054         4,785                         4,785
    Stock compensation                       905                             905           508                           508
    Depletion, depreciation and
     amortization                         63,864        (28,382)(A)       35,482        41,634       (18,088) (A)     23,546
                                       ---------      ---------        ---------    ----------     ---------        --------
Total operating expenses:                100,132        (38,609)          61,523       100,623       (24,228)         76,395
                                       ---------      ---------        ---------    ----------     ---------        --------

Income (loss) from operations             25,007        (18,590)           6,417       (28,452)       (7,963)        (36,415)
                                       ---------      ---------        ---------    ----------     ---------        --------
Other income (expenses):
    Interest expense                      (7,586)         1,482 (B)       (6,104)       (8,045)        2,013  (B)     (6,032)
    Interest income                          871                             871           238                           238
    Other, principally foreign 
      exchange gain                        1,418                           1,418           686                           686
                                       ---------      ---------        ---------    ----------     ---------        --------

                                          (5,297)         1,482           (3,815)       (7,121)        2,013          (5,108)
                                       ---------      ---------        ---------    ----------     ---------        --------

Income (loss) before income taxes         19,710        (17,108)           2,602       (35,573)       (5,950)        (41,523)

Income tax benefit (expense)              (6,610)         6,159 (A)         (451)       13,079                        13,079
                                       ---------      ---------        ---------    ----------     ---------        --------

Net income (loss)                      $  13,100      $ (10,949)       $   2,151    $  (22,494)    $  (5,950)       $(28,444)
                                       =========      =========        =========    ==========     =========        ========
</TABLE>



Notes to Unaudited Pro Forma Statements of Operations:

(A)   To record a 50% reduction in sales and operating costs related to sold
      properties and the related income tax effect of these adjustments.

(B)   To record a reduction in interest expense as a result of the repayment of
      outstanding debt with sales proceeds. Such amount was limited to the
      amount of bank credit facility outstanding.

<PAGE>   7

                                 EXHIBIT INDEX


         Exhibit
         Number                   Description

           2.1   Purchase and Sale Agreement dated January 15, 1999 between 
                 Petsec Energy Inc., as Seller, and Apache Corporation, 
                 as Buyer.

           99.1  Press Release dated February 1, 1999 of Petsec Energy Ltd 
                 announcing completion of sale.





<PAGE>   1

EXHIBIT 2.1







                          PURCHASE AND SALE AGREEMENT



                                     DATED



                                JANUARY 15, 1999




                                    BETWEEN



                               PETSEC ENERGY INC.

                                       AS

                                     SELLER




                                      AND




                               APACHE CORPORATION

                                       AS

                                     BUYER


<PAGE>   2

                               TABLE OF CONTENTS


1.     PURCHASE AND SALE................................................3

1.1        PURCHASE AND SALE............................................3
1.2        INTERESTS....................................................3
1.3        EFFECTIVE TIME...............................................4
1.4        TRANSFER OF SEISMIC DATA.....................................4

2.     THE PURCHASE PRICE...............................................5

2.1        PURCHASE PRICE...............................................5
2.2        ADJUSTMENTS TO PURCHASE PRICE................................5

3.     REPRESENTATIONS AND WARRANTIES, DISCLAIMERS AND WAIVERS..........6

3.1        REPRESENTATIONS AND WARRANTIES AND DISCLAIMERS OF SELLER.....6
3.2        REPRESENTATIONS AND WARRANTIES AND WAIVERS OF BUYER.........11

4.     COVENANTS AND AGREEMENTS........................................13

4.1        COVENANTS AND AGREEMENTS OF SELLER..........................13
4.2        COVENANTS AND AGREEMENTS OF BUYER...........................15
4.3        MUTUAL COVENANTS AND AGREEMENTS.............................15

5.     TITLE MATTERS...................................................16

5.1        DEFINITIONS.................................................16
5.2        TITLE DEFECT ADJUSTMENTS....................................18
5.3        CASUALTY LOSS...............................................19

6.     ENVIRONMENTAL DEFECTS...........................................19

6.1        ENVIRONMENTAL DEFECTS.......................................19
6.2        ENVIRONMENTAL DEFECT ADJUSTMENTS............................19
6.3        DEFINITIONS.................................................20

7.     CONDITIONS TO CLOSING...........................................20

7.1        SELLER'S CONDITIONS.........................................21
7.2        BUYER'S CONDITIONS..........................................21

8.     CLOSING.........................................................22

8.1        DATE OF CLOSING.............................................22
8.2        PLACE OF CLOSING............................................22
8.3        CLOSING OBLIGATIONS.........................................22

9.     OBLIGATIONS AFTER CLOSING.......................................24

9.1        POST-CLOSING ADJUSTMENT PROCEDURE...........................24
9.2        RECORDS.....................................................24
9.3        FURTHER ASSURANCES..........................................25
9.4        ASSUMPTION AND RETENTION OF OBLIGATIONS.....................25
9.5        INDEMNIFICATION.............................................26

10.    TERMINATION OF AGREEMENT........................................28

10.1          TERMINATION..............................................28
10.2          LIABILITIES UPON TERMINATION OR BREACH...................29

11.    MISCELLANEOUS...................................................29

11.1          EMPLOYEE MATTERS.........................................29

                                       i
<PAGE>   3
11.2          EXHIBITS.................................................29
11.3          EXPENSES.................................................30
11.4          NOTICES..................................................30
11.5          WIRE TRANSFER INSTRUCTIONS...............................30
11.6          AMENDMENTS...............................................31
11.7          ASSIGNMENT...............................................31
11.8          ANNOUNCEMENTS............................................31
11.9          HEADINGS.................................................31
11.10         COUNTERPARTS.............................................32
11.11         REFERENCES...............................................32
11.12         GOVERNING LAW............................................32
11.13         ENTIRE AGREEMENT.........................................32
11.14         PARTIES IN INTEREST......................................33
11.15         SURVIVAL.................................................33
11.16         ARBITRATION..............................................33
11.17         TAX MATTERS..............................................34
11.18         SUSPENSE ACCOUNTS........................................36
11.19         SEVERABILITY.............................................36
11.20         LIMITATION OF LIABILITY..................................36
11.21         WAIVER OF JURY TRIAL.....................................36
11.22         JURISDICTION AND VENUE...................................36


                                      ii
<PAGE>   4




                          PURCHASE AND SALE AGREEMENT


           This Purchase and Sale Agreement (the "Agreement"), dated January
15, 1999 is between PETSEC ENERGY INC., a Nevada corporation, having offices at
143 Ridgeway Drive, Suite 113, Lafayette, Louisiana 70503-3402 ("Seller"), and
APACHE CORPORATION, a Delaware corporation, having offices at 2000 Post Oak
Boulevard, Suite 100, Houston, Texas 77056-4400 ("Buyer").



           In consideration of the mutual promises contained herein, the
benefits to be derived by each party hereunder and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Buyer and Seller agree as follows:



1.         PURCHASE AND SALE
1.1        Purchase and Sale.

           Seller agrees to sell and convey, and Buyer agrees to purchase and 
pay for specified assets of Seller, the "Interests" (as defined in Section 1.2)
at the Closing, subject to the terms and conditions of this Agreement (the
"Acquisition").

1.2        Interests.

           Those certain undivided interests of Seller in and to the following
assets shall hereinafter be called the "Interests":



           (a)  The  leasehold  interests  specifically  described  on EXHIBIT
A-II hereto in the oil, gas and mineral leases described on EXHIBIT A-II (the
"Leases") insofar as such interests cover the lands described on EXHIBIT A-II
(the "Leasehold Interests");



           (b)  The interests in the oil and gas wells or units specifically 
described in EXHIBIT  A-I hereto (the "Wells");



           (c)  The oil, gas, casinghead gas, condensate,  distillate, liquid 
hydrocarbons, gaseous hydrocarbons and all products refined therefrom, together
with all minerals produced in association with these substances in and under
and which may be produced and saved from or attributable to the Leasehold
Interests on or after the Effective Time (collectively called the
"Hydrocarbons"), and all rents, issues, profits, proceeds, products, revenues
and other income from or attributable thereto;



           (d) An undivided fifty percent (50%) interest in and to the 
personal property, fixtures and improvements located on lands covered by
the Leases or used or specifically designated for use in connection with the
exploration, development, operation or maintenance of the Wells or Leasehold
Interests, including but not limited to that described in EXHIBIT A-III, or
used or specifically designated for use in connection with the production,
treatment, sale or disposal of hydrocarbons, sulfur or water produced therefrom

                                      3
<PAGE>   5
or attributable to the Leasehold Interests, including, without limitation,
platforms, pipelines, gathering systems and compression facilities located on
lands covered by the Leases or used or specifically designated for use in
connection with the Leasehold Interests (the "Equipment");



           (e) An undivided fifty percent (50%) interest in and to all 
agreements, product purchase and sale contracts, surface leases, gas
gathering contracts, salt water disposal leases and wells, processing
agreements, compression agreements, equipment leases, permits, rights-of-way,
easements, licenses, farmouts and farmins, options, orders, pooling, spacing or
consolidation agreements, operating agreements, transportation agreements and
all other agreements relating to the properties, interests and rights described
in Sections 1.2(a) through 1.2(d), including but not limited to one-half (50%)
of Seller's interest in the agreements described in Part I of EXHIBIT A-IV (the
"Contracts"); provided, however, that the Contracts shall specifically exclude
those contracts and agreements described in Part II of EXHIBIT A-IV which shall
not be assigned to or assumed by Buyer; and



           (f) A copy of all interpretive data generated by Seller
that pertains to the subsurface area directly below the Leases (including
structure maps and isopach maps), and originals of all technical and historical
geological and engineering information that pertains directly to the Interests
(including electric logs, core data, pressure data, historical decline curves,
historical graphical production curves, drilling reports, well completion
reports, drill stem test charts, historical engineering reports, well files and
field files), and all other documentary information that pertains directly to
the Interests (including title information, litigation files (other than
litigation files relating to those claims liability for which will be retained
by Seller hereunder without limitation as to time), land files, lease files,
division order files, contract files, environmental files and marketing files)
and accounting and financial data that pertains directly to the Interests
(other than tax returns and income tax information) (collectively, the
"Records"), to be made available to Buyer in accordance with the provisions of
Section 9.2 hereof. The Records shall not, however, include any information
that is not transferable or, if disclosed, would cause Seller to breach any
contract or agreement or would subject any legal privilege or the attorney
work/product doctrine to reasonable attack as having been waived.



1.3        Effective Time.

           The purchase and sale of the  Interests  shall be effective as of 
January 1, 1999, at 12:01 a.m., at the location of the Interests (the 
"Effective Time").

1.4        Transfer of Seismic Data.

           (a) As part of the transactions  contemplated by this Agreement,  
Seller shall convey to Buyer an undivided one-half (50%) interest in and to all
shallow hazard surveys and in and to Seller's proprietary seismic data covering
the lands covered by the Leasehold Interests, including without limitation that
data covering a portion of West Cameron Block 543 (the "Seismic Data"), to be
made available to Buyer in accordance with the provisions of Section 9.2
hereof.

           (b) ANY USE OF THE SEISMIC  DATA BY BUYER SHALL BE AT BUYER'S SOLE 
RISK. SELLER  SHALL NOT BE  RESPONSIBLE FOR ANY ACTIONS TAKEN BY BUYER BASED 
UPON THE SEISMIC DATA.

                                      4
<PAGE>   6
2.         THE PURCHASE PRICE.

2.1        Purchase Price.

           The purchase price for the Interests and the other conveyances 
provided for herein shall be Sixty-Eight Million, Five Hundred
Thousand and No/100 Dollars ($68,500,000.00) (the "Purchase Price"), subject to
adjustment at Closing as set forth in Section 2.2 and as otherwise subsequently
adjusted as set forth in Sections 5.2(d), 6.2(b) and 9.1. The parties agree
that the Purchase Price will be allocated among the Interests as reflected on
EXHIBIT A-II and to report such allocation for purposes of federal and state
tax returns.

2.2        Adjustments to Purchase Price.

           The Purchase Price shall be adjusted as follows:

           (a) The Purchase Price shall be adjusted upward by the following:


                     (1)  proceeds  accrued  to or  received  by Buyer  
           attributable to the Interests that are, in accordance with
           generally accepted accounting principles, attributable to the
           period of time prior to the Effective Time, including without
           limitation, the value of all oil in storage above the pipeline
           connection as of the Effective Time and not previously sold by
           Seller that is attributable to the Interests, such value to be the
           market price in effect as of the Effective Time, less taxes and
           gravity adjustments deducted by the purchaser of such oil;



                     (2) the amount of all expenditures; rentals and other 
           charges; ad valorem, property, production, excise, severance and
           similar taxes based upon or measured by the ownership of property
           or the production of hydrocarbons or the receipt of proceeds
           therefrom; expenses (including overhead determined in accordance
           with the Operating Agreement attached hereto as EXHIBIT C) billed
           under applicable operating agreements and, in the absence of an
           operating agreement, expenses of the sort customarily billed under
           such agreements, paid by or on behalf of Seller in connection with
           the operation of the Interests, in accordance with generally
           accepted accounting principles, to the extent not provided for in
           Section 2.2(a)(3), attributable to the period after the Effective
           Time;



                     (3) an amount equal to all prepaid expenses attributable
           to the Interests that are paid by or on behalf of Seller that are,
           in accordance with generally accepted accounting principles,
           attributable to the period after the Effective Time, including,
           without limitation, prepaid utility charges and prepaid ad
           valorem, property, production, severance and similar taxes based
           upon or measured by the ownership of property or the production of
           hydrocarbons or the receipt of proceeds therefrom, but excluding,
           without limitation, repairs made during the period after the
           Effective Time that relate to hurricane or similar damage
           occurring prior to the Effective Time; and

                                      5
<PAGE>   7
                     (4) any other amount agreed upon by Seller and Buyer.



           (b) The Purchase Price shall be adjusted downward by the following:



                     (1) proceeds accrued to or received by Seller attributable
           to the Interests that are, in accordance with generally accepted
           accounting principles, attributable to the period of time from and
           after the Effective Time;



                     (2) an amount equal to unpaid ad valorem, property, 
           production, severance and similar taxes and assessments based upon
           or measured by the ownership of the Interests that are
           attributable to periods of time prior to the Effective Time, which
           amounts shall, to the extent not actually assessed, be computed
           based on such taxes and assessments for the preceding tax year
           (such amount to be prorated for the period of Seller's and Buyer's
           ownership before and after the Effective Time);



                     (3) an amount equal to the sum of all Title Defect and 
           Environmental Defect adjustments; and



                     (4) any other amount agreed upon by Seller and Buyer.



3.         REPRESENTATIONS AND WARRANTIES, DISCLAIMERS AND WAIVERS.

3.1 Representations and Warranties and Disclaimers of Seller.

           Seller represents and warrants as of the date hereof and as of the 
Closing Date to Buyer as follows:



           (a) Seller is a corporation duly organized, validly existing and 
in good standing under the laws of the State of Nevada, and is duly 
qualified to carry on its business and is in good standing in each state
(and with appropriate federal agencies on the Outer Continental Shelf or
otherwise, if applicable) where failure to be so qualified would have a
material adverse effect on the transactions contemplated under this Agreement.



           (b) Seller has all requisite corporate power and authority
to carry on its business as presently conducted, and to enter into this
Agreement, and to perform its obligations under this Agreement. The
consummation of the transactions contemplated by this Agreement will not
violate, or be in conflict with (i) any provision of its articles of
incorporation or bylaws; or (ii) except as otherwise provided on EXHIBIT A-IV,
any provision of any agreement or instrument to which it is a party or by 

                                      6
<PAGE>   8
which it is bound, or (iii) to its Knowledge (as hereinafter defined), any 
judgment, decree, order, statute, rule or regulation applicable to it.



           (c) The execution, delivery and  performance of this Agreement and
the transactions contemplated hereby have been duly and validly authorized by 
all requisite corporate action on Seller's part.


           (d) This  Agreement has been duly authorized, executed and
delivered on behalf of Seller and constitutes the legal, valid and binding
obligation of Seller, enforceable in accordance with its terms, subject,
however, to the effects of bankruptcy, insolvency, reorganization and other
laws for the protection of creditors. Seller has been duly authorized to
consummate the transactions contemplated by this Agreement.



           (e) Except as set forth on SCHEDULE 3.1(E), there is no suit,
action, arbitration proceeding, or legal, administrative or other
proceeding, or, to Seller's Knowledge, governmental investigation pending or,
to Seller's Knowledge, threatened against Seller that is reasonably likely to
hinder or impede the operation of or Seller's title to the Interests, and there
is no such action or proceeding involving Seller or the Interests that is
reasonably likely to impede the consummation of the transactions contemplated
by this Agreement.



           (f) Seller has not incurred any liability, contingent or otherwise,
for brokers' or finders' fees relating to the transactions contemplated by this
Agreement for which Buyer shall have any responsibility whatsoever.


           (g) Except the Permitted Encumbrances, Seller has not, (i) except 
as set forth on SCHEDULE 3.1(G) (which liens and encumbrances as set
forth on SCHEDULE 3.1(G) shall, as to the Interests, be released at or before
Closing), created or allowed to be created any liens, pledges or encumbrances
covering or affecting the Interests, or (iii) made any transfers, assignments
or conveyances which would cause Seller's ownership of the Leasehold Interests
to be such that, with respect to a Lease listed on EXHIBIT A-II, (A) Seller is
entitled to receive a decimal share of the oil, gas and other hydrocarbons
produced, saved and marketed from or attributable to such Leasehold Interests
which is less than the decimal share set forth on EXHIBIT A-II in connection
with such Leasehold Interests as the "Net Revenue Interest" or (B) Seller is
obligated to bear a decimal share of the cost of operation of such Leasehold
Interests greater than the decimal share set forth on EXHIBIT A-II in
connection with such Leasehold Interests as the "Working Interest" (without at
least a proportionate increase in the share of production to which Seller is
entitled to receive). It is understood and agreed that a claim or other matter
arising other than by, through or under Seller, will not result in a breach of
the foregoing representation and warranty. EXCEPT FOR THE REPRESENTATION
CONTAINED IN THIS SUBSECTION 3.1(G) AND THE WARRANTY OF TITLE BY, THROUGH OR
UNDER SELLER CONTAINED IN THE CONVEYANCES TO BE EXECUTED AT CLOSING, SELLER
MAKES NO WARRANTY OR REPRESENTATION, EXPRESS, IMPLIED, STATUTORY OR OTHERWISE,
WITH RESPECT TO SELLER'S TITLE TO ANY OF THE INTERESTS.

                                      7
<PAGE>   9
           (h) Except as set forth on SCHEDULE 3.1(J), Seller has not
received any notice of a violation of any laws, rules, regulations, ordinances
or orders, permits, licenses or other authorizations of any local, tribal,
state or federal governmental bodies, authorities or agencies having
jurisdiction that are material to the ownership and/or operation of the
Interests and that has not been remedied to the satisfaction of such bodies,
authorities or agencies or as otherwise required by applicable law (other than
matters relating to "Environmental Laws" as hereinafter defined) and, to
Seller's Knowledge, no such notice of violation has been threatened by any such
entity to be issued against Seller. Except as set forth on SCHEDULE 3.1(J), to
Seller's Knowledge, Seller is in compliance with all laws, rules, regulations,
ordinances and orders, permits, licenses and other authorizations of all local,
tribal, state and federal governmental bodies, authorities and agencies having
jurisdiction that are material to the ownership and/or operation of the
Interests (other than Environmental Laws).



           (i) Except as set forth on SCHEDULE 3.1(J), to Seller's Knowledge,
Seller is in compliance with all Environmental Laws that are applicable to the
ownership and/or operation of the Interests. To Seller's Knowledge, Seller is
in material compliance with all license and permit requirements and other
approvals required to comply with all Environmental Laws. Seller has not been
involved in or directly or indirectly caused a spill or release of any
reportable amount of any chemical, material or emission related to use,
ownership or operation of the Leasehold Interests or the Wells, except for
matters that when required by the Environmental Laws have been remedied and
have no continuing material consequence to Seller or the Interests.


           (j) Except as set forth on SCHEDULE 3.1(J), there are no actions, 
suits, claims, notices as to matters that are outstanding or have not
been remedied to the satisfaction of the party asserting same, orders or
proceedings seeking money damages, injunctive relief, remedial action,
penalties, cost recovery or other remedy pending or, to Seller's Knowledge,
overtly threatened to Seller against or with respect to the Interests and
relating to the violation of, liability under, or non-compliance with
Environmental Laws. To Seller's Knowledge there is no impending statutory or
regulatory deadline, or impending change in the law that would make it
impossible for Seller to obtain, extend or renew any permit or license
necessary for the profitable operation of the Interests.



           (k) Seller currently maintains insurance on the Interests covering 
such risks and with such deductible amounts as are consistent with sound
business practice, and Seller shall provide Buyer with copies of the policies
no later than ten (10) days prior to Closing. SCHEDULE 3.1(K) contains a
listing of all such insurance policies, and specifies as to each policy the
expiration date, coverage limits, deductibles, and underwriter.



           (l) No funds attributable to the Interests belonging to Seller are 
being held by any other person in suspense accounts or otherwise.


           (m) To Seller's Knowledge, no filing or registration with,
and no permit, authorization, consent or approval of, any public body or
authority (including, without limitation such as may be required pursuant to
applicable requirements of the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended ("HSR Act")) or, except as otherwise set forth on EXHIBIT
A-IV, any third party, that has not been obtained is necessary for consummation

                                      8
<PAGE>   10
of the transactions contemplated by this Agreement except all rights to consent
by, required notices to and filings with or other actions by governmental or
tribal entities, if any, in connection with the change of ownership or control
of an interest in federal, state, tribal or other domestic governmental oil and
gas leases which are customarily obtained with respect to such change of
ownership or control subsequent to such change of ownership or control.


           (n) Seller has no contracts or commitments with respect to
the Hydrocarbons, including without limitation, oil and gas purchase and sale
contracts, other than those terminable at the sole discretion of Seller, with
respect to the sale of liquid hydrocarbons, upon not more than 45 days' notice
from the Closing Date, and with respect to gas, upon not more than 90 days'
notice from the Closing Date, except as set forth on EXHIBIT A-IV. Except as
set forth on EXHIBIT A-IV or on SCHEDULE 3.1(U), Seller has no obligation to
deliver oil or gas pursuant to any take-or-pay, prepayment, imbalance, call on
production, or similar arrangement with respect to the Interests.



           (o) No  Interests are subject to, or considered to be held by, any
partnership for federal income tax purposes not including tax partnerships
contained in joint operating agreements identified on EXHIBIT A-IV.


           (p) Except as otherwise set forth on SCHEDULE 3.1(P), all royalties,
rentals, overriding royalty interests and other payments due under the
Leasehold Interests with respect to Hydrocarbons produced therefrom have,
during the period of Seller's ownership thereof, and to Seller's Knowledge as
to all other periods, been properly and timely paid. No notices or other
communications have been received by Seller of any claim or lien to the
contrary.

           (q) To Seller's Knowledge, no Well included in the Interests is 
subject to material penalties on allowables because of any overproduction or
any other violation of applicable laws, which would have an adverse effect upon
the Interests. Except as disclosed on SCHEDULE 3.1(Q), to Seller's Knowledge,
there are no wells located on the Leases that Seller is currently obligated by
order of any governmental body to plug and abandon within a certain time.

           (r) Except as set forth on SCHEDULE 3.1(R), all of the
Equipment that is material to the operation of the Leasehold Interests and
Wells has been maintained by Seller in accordance with sound oil and gas
industry practices, normal wear and tear excepted, and as of the date hereof
and as of the Closing (provided that Buyer, if applicable, has approved
necessary expenses under Section 4.1(c)(7) hereof and has agreed to pay its
proportionate share thereof) is in good working condition.

           (s) Between the date of execution of this Agreement and Closing, 
with respect to each of the Interests, (i) Seller will not exchange any
Equipment for property of lesser value and (ii) will not remove any idle or
other equipment or inventory from the Interests except with the prior approval
of Buyer.

           (t) Except as set forth on SCHEDULE 3.1(T), the Interests are not
subject to any preferential rights to purchase in favor of third parties.

           (u) Except as set forth on SCHEDULE 3.1(U), there are no well,
platform or pipeline gas imbalances that exist with respect to the Interests.

                                      9
<PAGE>   11
           (v) Seller has not omitted to disclose to Buyer facts known to
Seller that would materially affect the value of the Interests. All periodic
reports and reports on Form 8-K filed by Seller since January 1, 1998 under the
Securities Exchange Act of 1934 (the "1934 Act") are true, complete and
accurate in all material respects.


           (w) Buyer has been furnished all underwater inspection reports
and findings conducted during Seller's ownership of the Interests.


           (x) Seller is not aware of the existence of any fact or condition
with respect to the Interests that may cause the Minerals Management Service to
withhold its unconditional approval to the assignments contemplated herein that
require approval of the Minerals Management Service.

           (y) Other than matters of public record and other than permits 
and  licenses,  Exhibit A-IV sets forth a complete list of all Contracts that
are material to the present ownership and operation of the Interests 
("Material Contracts").

           (z) Seller has not made any assignments, transfers or conveyances 
or created any reversionary rights or similar rights in favor of third parties
that would operate to reduce Sellers rights in the Equipment to less than the
interest set forth in Section 1.2(d) with respect to the property listed in
EXHIBIT A-III.

           (AA) DISCLAIMERS. THE EXPRESS REPRESENTATIONS AND
WARRANTIES OF SELLER CONTAINED IN THIS SECTION 3.1 OR ELSEWHERE IN THIS
AGREEMENT (OR IN ANY CONVEYANCE EXECUTED PURSUANT TO THIS AGREEMENT) ARE
EXCLUSIVE AND ARE IN LIEU OF ALL OTHER REPRESENTATIONS AND WARRANTIES, EXPRESS,
IMPLIED, STATUTORY OR OTHERWISE, AND SELLER EXPRESSLY DISCLAIMS ANY AND ALL
SUCH OTHER REPRESENTATIONS AND WARRANTIES. EXCEPT AS EXPRESSLY PROVIDED IN
SECTION 3.1 OR ELSEWHERE IN THIS AGREEMENT (OR IN ANY CONVEYANCE EXECUTED
PURSUANT TO THIS AGREEMENT), THE INTERESTS AND THE SEISMIC DATA SHALL BE
CONVEYED PURSUANT HERETO WITHOUT ANY WARRANTY OR REPRESENTATION WHETHER
EXPRESS, IMPLIED, STATUTORY OR OTHERWISE, RELATING TO THE CONDITION, QUANTITY,
QUALITY, FITNESS FOR A PARTICULAR PURPOSE, CONFORMITY TO THE MODELS OR SAMPLES
OF MATERIALS OR MERCHANTABILITY OF ANY EQUIPMENT OR ITS FITNESS FOR ANY
PURPOSE, AND WITHOUT ANY OTHER WARRANTY OR REPRESENTATION WHATSOEVER, WHETHER
EXPRESS, IMPLIED, STATUTORY OR OTHERWISE. BUYER SHALL HAVE INSPECTED, OR WAIVED
(AND UPON CLOSING SHALL BE DEEMED TO HAVE WAIVED), SUBJECT TO SECTIONS 9.4, 9.5
AND 11.15, ITS RIGHT TO INSPECT, THE INTERESTS FOR ALL PURPOSES AND SATISFIED
ITSELF AS TO THEIR PHYSICAL AND ENVIRONMENTAL CONDITION, BOTH SURFACE AND
SUBSURFACE, INCLUDING BUT NOT LIMITED TO CONDITIONS SPECIFICALLY RELATED TO THE
PRESENCE, RELEASE OR DISPOSAL OF HAZARDOUS SUBSTANCES, SOLID WASTES, ASBESTOS
AND OTHER MAN MADE FIBERS, OR NATURALLY OCCURRING RADIOACTIVE MATERIALS
("NORM"). BUYER IS RELYING SOLELY UPON ITS OWN INSPECTION OF THE INTERESTS AND
UPON THE REPRESENTATIONS AND WARRANTIES SET FORTH IN THIS SECTION 3.1, AND
BUYER SHALL ACCEPT ALL OF THE INTERESTS AND THE SEISMIC DATA IN THEIR "AS IS,"
"WHERE IS" CONDITION AND WITH ALL FAULTS. ALSO WITHOUT LIMITATION OF THE
FOREGOING, SELLER MAKES NO WARRANTY OR REPRESENTATION, EXPRESS, IMPLIED,
STATUTORY OR OTHERWISE, AS TO THE ACCURACY OR COMPLETENESS OF ANY DATA,
REPORTS, RECORDS, PROJECTIONS, INFORMATION OR MATERIALS NOW, HERETOFORE OR
HEREAFTER FURNISHED OR MADE AVAILABLE TO BUYER IN CONNECTION WITH BUYER'S
EVALUATION OF SELLER OR THE INTERESTS OR THE SEISMIC DATA INCLUDING, WITHOUT
LIMITATION, RELATIVE TO PRICING ASSUMPTIONS, OR QUALITY OR QUANTITY OF
HYDROCARBON RESERVES (IF ANY) ATTRIBUTABLE TO THE INTERESTS OR THE ABILITY OR
POTENTIAL OF THE INTERESTS TO PRODUCE HYDROCARBONS OR THE ENVIRONMENTAL
CONDITION OF THE INTERESTS OR ANY OTHER MATTERS CONTAINED IN THE DATA OR ANY
OTHER MATERIALS FURNISHED OR MADE AVAILABLE TO BUYER BY SELLER OR BY THE AGENTS

                                      10
<PAGE>   12
OR REPRESENTATIVES OF SELLER. ANY AND ALL SUCH DATA, RECORDS, REPORTS,
PROJECTIONS, INFORMATION AND OTHER MATERIALS (WRITTEN OR ORAL) FURNISHED BY
SELLER OR OTHERWISE MADE AVAILABLE OR DISCLOSED TO BUYER ARE PROVIDED BUYER AS
A CONVENIENCE AND SHALL NOT CREATE OR GIVE RISE TO ANY LIABILITY OF OR AGAINST
SELLER AND ANY RELIANCE ON OR USE OF THE SAME SHALL BE AT BUYER'S SOLE RISK TO
THE MAXIMUM EXTENT PERMITTED BY LAW. SELLER HEREBY EXPRESSLY DISCLAIMS AND
NEGATES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AT COMMON LAW, BY
STATUTE OR OTHERWISE, RELATING TO ANY (I) AMOUNT, VALUE OR DELIVERABILITY OF
OIL, GAS OR OTHER RESERVES ON OR UNDER THE LEASES, OR (II) ANY GEOLOGICAL,
ENGINEERING, ECONOMIC OR OTHER INTERPRETATIVE DATA OR INFORMATION, OR (III)
INFRINGEMENT BY SELLER OR ANY OF ITS AFFILIATES OF ANY PATENT OR PROPRIETARY
RIGHT OF ANY THIRD PARTY AND NEGATES ANY RIGHTS OF BUYER UNDER STATUTES, CODE
ARTICLES OR ANY OTHER PROVISIONS OF LAW TO CLAIM DIMINUTION OF CONSIDERATION
AND ANY CLAIMS BY BUYER FOR DAMAGES OR RETURN OF ALL OR ANY PORTION OF THE
PURCHASE PRICE BECAUSE OF REDHIBITORY VICES OR DEFECTS, WHETHER KNOWN OR
UNKNOWN, IT BEING THE INTENTION OF SELLER AND BUYER THAT THE INTERESTS AND THE
SEISMIC DATA ARE TO BE ACCEPTED BY BUYER IN THEIR PRESENT CONDITION AND STATE
OF REPAIR. (For purposes of this Agreement, the term "AFFILIATE" shall mean any
person controlling, controlled by or under common control with the specified
person. The concept of control, controlling or controlled as used in the
preceding sentence means the possession, directly or indirectly, of the power
to direct or cause the direction of the management and policies of another,
whether through the ownership of voting securities, by contract or otherwise.)

           (bb) As used in this Article 3, the term "Knowledge" shall mean the
knowledge of Seller or Buyer, as applicable, after due inquiry.

3.2        Representations and Warranties and Waivers of Buyer.


           Buyer represents and warrants as of the date hereof and as of the 
Closing Date to Seller as follows:



           (a) Buyer is a corporation duly organized, validly
existing and in good standing under the laws of the State of Delaware and is
duly qualified to carry on its business and is in good standing in each state
(and with appropriate federal agencies on the Outer Continental Shelf or
otherwise, if applicable) where failure to be so qualified would have a
material adverse effect on the transactions contemplated under this Agreement.



           (b) Buyer has all requisite corporate power and authority
to carry on its business as presently conducted, to enter into this Agreement,
to purchase the Interests on the terms described in this Agreement and to
perform its other obligations under this Agreement. The consummation of the
transactions contemplated by this Agreement will not violate, or be in conflict
with, (i) any provision of its articles of incorporation or bylaws; or (ii) any
provision of any agreement or instrument to which it is a party or by which it
is bound, or (iii) to its Knowledge, any judgment, decree, order, statute, rule
or regulation .



           (c) The execution, delivery and performance of this Agreement and 
the transactions contemplated hereby have been duly and validly authorized by 
all requisite corporate action on Buyer's part.

                                      11
<PAGE>   13

           (d) This  Agreement has been duly executed and delivered on Buyer's
behalf. This Agreement constitutes Buyer's legal, valid and binding obligation,
enforceable in accordance with its terms, subject, however, to the effects of
bankruptcy, insolvency, reorganization and other laws for the protection of
creditors.



           (e) Buyer has incurred no liability, contingent or otherwise, 
for brokers' or finders'fees relating to the transactions contemplated by this
Agreement for which Seller shall have any responsibility whatsoever.


           (f) There is no suit, action, arbitration proceeding, or
legal, administrative or other proceeding, or, to Buyer's Knowledge,
governmental investigation pending or, to Buyer's Knowledge, threatened against
or involving Buyer that is reasonably likely to impede the consummation of the
transactions contemplated by this Agreement.

           (g) To Buyer's Knowledge, no filing or registration with,
and no permit, authorization, consent or approval of, any public body or
authority, including, without limitation such as may be required pursuant to
applicable requirements of the HSR Act, or, except as otherwise set forth on
EXHIBIT A-IV, any third party, is necessary for consummation of the
transactions contemplated by this Agreement except all rights to consent by,
required notices to and filings with or other actions by governmental or tribal
entities, if any, in connection with the change of ownership or control of an
interest in federal, state, tribal or other domestic governmental oil and gas
leases which are customarily obtained with respect to such change of ownership
or control subsequent to such change of ownership or control. This
representation is made with respect to compliance with the HSR Act on the
advice of Seller that the value of "associated exploration and production
assets," as defined in 16 CFR ss.802.3(c), included within the Interests does
not exceed $15,000,000.

           (h) Buyer is an experienced and knowledgeable purchaser, owner and
operator of oil and gas properties, is able to bear the economic risks of its
acquisition and ownership of the Interests and the Seismic Data, has the
ability to evaluate (and in fact has evaluated) the Interests and the Seismic
Data for purchase and the merits and risks of the acquisition and ownership
thereof, and is acquiring the Interests and the Seismic Data for its own
account and not with the intent to make a sale or 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, rules or regulations. Buyer has relied solely on its own
independent investigation and evaluation of, and appraisal and judgment with
respect to, the acquisition contemplated by this Agreement. Buyer is an
"accredited investor," as such term is defined in Regulation D of the
Securities Act of 1933, as amended.

           (i) Buyer is not aware of the existence of any fact or condition  
with respect to Buyer or the Interests that may cause the Minerals Management
Service to withhold its unconditional approval to the assignments contemplated
herein that require approval of the Minerals Management Service.

           (j) There  are  no  bankruptcy, reorganization or arrangement 
proceedings pending against, being contemplated by, or, to the Knowledge
of Buyer, threatened against Buyer.

           (k)  WAIVER. BUYER REPRESENTS AND WARRANTS TO SELLER THAT IT IS 
NOT A "CONSUMER" WITHIN THE MEANING OF THE DECEPTIVE TRADE PRACTICES -CONSUMER
PROTECTION ACT OF THE STATE OF TEXAS, TEX. BUS. & COM. CODE SS. 17.41 ET SEQ.,

                                      12
<PAGE>   14

AS AMENDED, AND HEREBY EXPRESSLY WAIVES AND RELEASES ALL OF ITS RIGHTS AND
REMEDIES THEREUNDER AS APPLICABLE TO SELLER AND ITS SUCCESSORS. FURTHER BUYER
HEREBY UNCONDITIONALLY AND IRREVOCABLY WAIVES ANY AND ALL RIGHTS OR REMEDIES IT
MAY HAVE UNDER THE LOUISIANA UNFAIR TRADE PRACTICES AND CONSUMER PROTECTION
LAW, LA. REV. STAT. SS.SS. 51:1401, ET SEQ. TO THE MAXIMUM EXTENT IT CAN DO SO
UNDER APPLICABLE LAW, IF SUCH ACT WOULD FOR ANY REASON BE DEEMED APPLICABLE TO
THE TRANSACTIONS CONTEMPLATED HEREBY AND UNDER ANY OTHER COMPARABLE APPLICABLE
LAWS.

           FURTHER, BUYER EXPRESSLY WAIVES THE WARRANTY OF FITNESS AND THE
ABSENCE OF HIDDEN DEFECTS AND THE WARRANTY AGAINST REDHIBITORY VICES
AND DEFECTS, WHETHER APPARENT OR LATENT, IMPOSED BY LOUISIANA CIVIL CODE
ARTICLES 2475 AND 2520, AND ANY OTHER APPLICABLE STATE OR FEDERAL LAW, RULE OR
REGULATION AND THE JURISPRUDENCE THEREUNDER. BUYER ALSO WAIVES ANY RIGHTS IT
HAS OR MAY HAVE UNDER STATUTES, CODE ARTICLES OR ANY OTHER PROVISIONS OF LAW TO
CLAIM DIMINUTION OF CONSIDERATION AND ANY CLAIMS FOR DAMAGES OR RETURN OF ALL
OR ANY PORTION OF THE PURCHASE PRICE BECAUSE OF REDHIBITORY VICES OR DEFECTS,
WHETHER KNOWN OR UNKNOWN, UNDER LOUISIANA CIVIL CODE ARTICLES 2520 THROUGH
2548, INCLUSIVE, OR OTHERWISE, IT BEING THE INTENTION OF BUYER THAT THE
INTERESTS AND THE SEISMIC DATA ARE TO BE ACCEPTED BY BUYER IN THEIR PRESENT
CONDITION AND STATE OF REPAIR. BUYER DECLARES AND ACKNOWLEDGES THAT THESE
WAIVERS HAVE BEEN BROUGHT TO ITS ATTENTION AND EXPLAINED IN DETAIL AND THAT IT
HAS VOLUNTARILY AND KNOWINGLY CONSENTED TO THESE WAIVERS. BY ITS SIGNATURE,
BUYER EXPRESSLY ACKNOWLEDGES ALL SUCH WAIVERS. BUYER RECOGNIZES AND AGREES THAT
ALL MATERIALS MADE AVAILABLE TO IT IN CONNECTION WITH BUYER'S EVALUATION OF
SELLER OR THE INTERESTS OR THE SEISMIC DATA, ARE (OR HAVE BEEN) MADE AVAILABLE
TO IT AS AN ACCOMMODATION, AND, EXCEPT AS PROVIDED IN SECTION 3.1(V), WITHOUT
REPRESENTATION OR WARRANTY OF ANY KIND AS TO THE ACCURACY AND COMPLETENESS OF
SUCH MATERIALS. BUYER ACKNOWLEDGES THAT, EXCEPT FOR THE APPLICABLE WARRANTIES
PROVIDED IN SECTION 3.1 AND IN THE CONVEYANCES TO BE EXECUTED AT CLOSING, IF
ANY, NO WARRANTY OF ANY KIND IS MADE BY SELLER AS TO THE INFORMATION SUPPLIED
TO BUYER OR WITH RESPECT TO THE INTERESTS OR THE SEISMIC DATA, AND BUYER
EXPRESSLY AGREES THAT ANY CONCLUSIONS DRAWN THEREFROM SHALL BE THE RESULT OF
ITS OWN INDEPENDENT REVIEW AND JUDGMENT.

4.         COVENANTS AND AGREEMENTS.

4.1        Covenants and Agreements of Seller.

           Seller covenants and agrees with Buyer as follows:

           (a) Seller has, and until Closing will make available to
Buyer for examination at a location designated by Seller all Records and,
subject to the consent and cooperation of operators and other third parties,
will cooperate with Buyer in Buyer's efforts to obtain, at Buyer's expense,
such additional information relating to the Interests as Buyer may reasonably
request, to the extent in each case that Seller may do so without violating
legal constraints or any obligation of confidence or other contractual
commitment of Seller to a third party or without subjecting any legal privilege
or the attorney work/product doctrine to reasonable attack as having been
waived.



           (b) Seller shall permit, or in the case of third-party
operated Interests, Seller shall use commercially reasonable efforts to cause
the operator thereof to permit, Buyer's authorized representative to conduct,
at reasonable times and at Buyer's sole risk, cost and expense (to be evidenced
by an indemnification agreement acceptable to Seller), reasonable on-site
inspections of the Interests, subject to reasonable requirements of Seller.

                                      13
<PAGE>   15

           (c) During the period from the  Effective Time of this Agreement to
the Closing Date, Seller agrees, unless specifically waived by Buyer in 
writing, to:



                     (1) maintain and operate the Interests, to the extent
           Seller is the operator thereof, or to use commercially reasonable
           efforts to cause the Interests to be maintained and operated, in a
           good and workmanlike manner and in substantially the same manner
           as heretofore operated; and maintain books of account and records
           with regard to the Interests in accordance with Seller's past
           practices;


                     (2) pay timely its share of all costs and expenses 
           attributable to the Interests;



                     (3) not enter into any material agreements, including,  
           without limitation, any agreement affecting production from the
           Interests, not terminable without penalty or other liability upon
           30 days' notice or less (other than presently existing oil
           marketing contracts that are automatically renewed monthly under
           existing terms), or amend or terminate any material existing
           agreements relating to the Interests;



                     (4) except as set forth in Section  4.1(c)(3), not 
           encumber, sell, or otherwise dispose of any of the Interests
           except with prior notice to Buyer and provided that any such
           encumbrance will be released at Closing;



                     (5) not  participate in the drilling of any new well on 
           or relating to the Interests or fail to participate in operations
           on or relating to the Interests proposed by other parties, without
           the advance written consent of Buyer, which consent or non-consent
           must be given by Buyer within three business days (unless earlier
           response is required by applicable contract) of the receipt of
           written notice from Seller;



                     (6) not take any action or fail to take any action  
           which is reasonably expected to result in any termination of the
           Leases forming a part of the Interests;



                     (7) not enter into or assume any commitment which
           involves payments, receipts or potential liabilities with respect
           to the Interests of more than $25,000.00, excluding emergency
           expenditures;



                     (8) not cancel or waive any debt, claim or right of 
           value relating to the Interests; and

                                      14
<PAGE>   16

                     (9) if any approval or consent by a federal, state or 
           local government authority is required to vest "Defensible Title",
           as hereinafter defined, to any of the Interests in Buyer at
           Closing, exercise its best efforts, as reasonably requested by
           Buyer and at Buyer's expense, to obtain all such required
           approvals or consents.



           (d) Seller shall promptly notify Buyer, if, between the date hereof
and the Closing Date, Seller receives notice of any claim, suit, action or
other proceeding of the type referred to in Section 3.1(e) or 3.1(j) but not
listed on SCHEDULE 3.1 and any change in the status of claims referred to in
SCHEDULE 3.1.



           (e) Seller shall use commercially reasonable efforts to obtain 
third-party consents burdening the Interests.



           (f) From and after Closing and subject to the terms and conditions
of the applicable seismic license agreements, (i) Seller shall permit Buyer,
its successors and assigns, to have access to review, at Seller's office and
during Seller's normal business hours, all seismic data now owned or licensed
to Seller relating to the subsurface directly below the lands covered by the
Leasehold Interests that Seller is not prohibited by contract from disclosing
to Buyer and (ii) Buyer shall permit Seller, its successors and assigns, to
have access to review, at Buyer's office and during Buyer's normal business
hours, all seismic data now owned or licensed to Buyer relating to the
subsurface directly below the lands covered by the Leasehold Interests that
Buyer is not prohibited by contract from disclosing to Seller.

4.2        Covenants and Agreements of Buyer.

                     Buyer covenants and agrees with Seller that:



                     (a) Buyer shall use commercially reasonable efforts to
maintain its corporate status and to assure that as of the Closing Date it will
not be under any material corporate, legal or contractual restriction that
would prohibit or delay the timely consummation of the acquisition.



                     (b) Buyer shall take over operations as of 7:00 a.m. local
time at the wellsite on the day following Closing. Upon taking over 
operations, Buyer will post all necessary state, federal and local bonds and 
shall assist Seller in having Seller's existing bonds released, or in the 
alternative, having the wells operated by Buyer released from Seller's 
existing bond.



4.3        Mutual Covenants and Agreements.

           (A) BUYER AND SELLER COVENANT AND AGREE WITH EACH OTHER THAT EACH 
WILL COOPERATE WITH THE OTHER AND USE COMMERCIALLY REASONABLE EFFORTS TO (I)
PROCURE UPON REASONABLE TERMS AND CONDITIONS ALL NECESSARY CONSENTS AND
APPROVALS TO THE ACQUISITION AND THIS AGREEMENT, (II) COMPLETE ALL NECESSARY
FILINGS, REGISTRATIONS AND CERTIFICATES, AND (III) SATISFY ALL REQUIREMENTS
PRESCRIBED BY LAW FOR, AND ALL CONDITIONS TO, THE CONSUMMATION OF THE
ACQUISITION AND THE TRANSACTIONS CONTEMPLATED HEREBY.

                                      15
<PAGE>   17
           (B) BUYER AND SELLER SHALL EXECUTE AT CLOSING, FOR EACH "FIELD" 
LISTED IN Exhibit C-I, A JOINT OPERATING AGREEMENT IN THE FORM OF Exhibit C
ATTACHED HERETO ("OPERATING AGREEMENT") DESIGNATING BUYER AS THE OPERATOR OF
ALL WELLS, LEASES AND LANDS INCLUDED IN THE INTERESTS.

5.         TITLE MATTERS.

5.1        Definitions.


           (a) The term "Defensible Title" shall mean, as to the Leasehold 
Interests, such title held by Seller that (i) is free from reasonable doubt to
the end that a prudent purchaser engaged in the business of the ownership,
development and operation of producing oil and gas properties, with knowledge
of all of the facts and their legal bearing, would be willing to accept and pay
full value therefor; (ii) is deducible of record from the records of the
applicable parish or county, or, in the case of federal leases, from the
records of the applicable office of the Bureau of Lands Management or Minerals
Management Service, or, in the case of state leases, from the applicable
records of the applicable state land office; (iii) entitles Buyer, as Seller's
successor in title, to receive not less than the "Net Revenue Interest" set
forth in EXHIBIT A-II as to each Leasehold Interest, without reduction,
suspension or termination throughout the productive life of such Leasehold
Interest; (iii) obligates Buyer, as Seller's successor in title, to bear costs
and expenses relating to operations on and the maintenance and development of
each Leasehold Interest in an amount not greater than the "Working Interest"
set forth in EXHIBIT A-II with respect to each Leasehold Interest; without
increase for the respective productive life of such Leasehold Interest, and
(iv) is free and clear of liens and material encumbrances and defects, except
for Permitted Encumbrances.



           (b) The term "Permitted Encumbrances," as used herein,
shall mean the following, provided that, as to Leasehold Interests, the net
cumulative effect of such encumbrances does not operate to reduce the Net
Revenue Interest as to any Leasehold Interest to less than the Net Revenue
Interest set forth in EXHIBIT A-II for such Leasehold Interest and does not
operate to increase the costs and expenses relating to the operations on and
the maintenance and development of any Leasehold Interest in an amount greater
than the Working Interest set forth in EXHIBIT A-II for such Leasehold
Interest:



                               (1) lessors' royalties, overriding royalties,
           unitization and pooling designations and agreements, reversionary
           interests and similar burdens (to the extent same are a matter of
           public record in the records of the applicable parish or county, the
           records of the applicable office of the Bureau of Lands Management
           or the Minerals Management Service or the applicable records of the
           applicable state land office);



                               (2) required third party consents to assignments
           and similar agreements with respect to which (i) waivers or consents
           are obtained from the appropriate parties prior to the Closing Date,
           or (ii) the appropriate time period for asserting such rights has
           expired prior to the Closing Date without an exercise of such
           rights;

                                      16
<PAGE>   18
                               (3) all rights to consent by, required notices
           to, filings with, or other actions by governmental entities in
           connection with this Acquisition if the same are customarily
           obtained subsequent to such sale or conveyance;



                               (4) easements, rights-of-way, servitudes,
           permits, surface leases and other rights with respect to surface
           operations, pipelines, canals, ditches, reservoirs or the like;
           conditions, covenants or other restrictions; and easements for
           pipelines, telephone lines, power lines and other easements and
           rights-of-way, on, over or in respect of any of the Interests which
           are owned by third parties and do not materially affect the value of
           the Interests or operations thereon;



                               (5) the Contracts;


                               (6) liens for taxes not yet delinquent or, if 
           delinquent, being contested in good faith;

                               (7) undetermined or inchoate liens or charges
           incurred or threatened incidental to maintaining, developing,
           producing, processing or operating the Interests of which Seller has
           no notice prior to the Closing Date; and

                               (8) materialman's, mechanics', repairman's,
           employees', contractors', operators' or similar liens, security
           interests or charges that are not delinquent or, if delinquent, are
           being contested in good faith.

                     (c) The term "Title Defect" as used herein shall mean any
           material encumbrance, encroachment, irregularity, defect in or 
           objection to title to the Interests (expressly excluding Permitted 
           Encumbrances), that alone or in combination with other Title 
           Defects renders title to the Leasehold Interests less than 
           Defensible Title. Additionally, the term Title Defect includes the 
           following:



                               (1) If Buyer determines reasonably and in good
           faith that there has been substantial non-compliance with the
           material laws, rules, regulations, ordinances or orders of any
           governmental agency or authority having jurisdiction over the
           Leasehold Interests, resulting in substantial risk of loss of the
           Leasehold Interests or value thereof, then Buyer may elect to treat
           such non-compliance as a Title Defect.



                               (2) If Seller is obligated by virtue of a
           prepayment arrangement under any contract or other arrangement to
           deliver Hydrocarbons produced from the Leasehold Interests at some
           future time without then or thereafter receiving full payment
           therefor, then Buyer may elect to treat such arrangement as a Title
           Defect.



                               (3) If Buyer becomes aware of any suit, action
           or other proceeding before any court or governmental agency that
           Buyer determines reasonably and in good faith would result in loss
           or impairment of Seller's title to any portion of the Leasehold
           Interests or a portion of the value thereof, Buyer may elect to
           treat such action as a Title Defect.

                                      17
<PAGE>   19

                               (4) If any necessary third party consent to
           assignment of any of the Leasehold Interests is not obtained prior
           to the Closing Date, Buyer may elect to treat such consent
           requirement as a Title Defect. For purposes hereof "necessary third
           party consents" shall not include consents customarily obtained
           subsequent to such assignment including, without limitation, consent
           to the assignment of federal, state or Indian leases.



5.2        Title Defect Adjustments.

                     (a) A Title Defect shall not be considered for adjustment
unless such Title Defect results, in Buyer's good faith and reasonable
calculation, in a reduction in the Allocated Value of a Leasehold Interest in
excess of $25,000.00. "Allocated Value" of a Leasehold Interest, as used in
this Agreement, means the value allocated to each Leasehold Interest as set
forth in EXHIBIT A-II hereto.

                      (b) Buyer shall give Seller written notice of Title
Defects on or before January 25, 1999, at 5:00 p.m., Central Time. Such notice
shall be in writing and shall include (i) a description of the Title Defect,
(ii) the Allocated Value of the Leasehold Interest affected by the Title
Defect, (iii) the amount by which Buyer believes the Allocated Value of such
Leasehold Interest has been reduced because of such Title Defect and (iv)
supporting documents reasonably necessary for Seller or its agents to verify
the existence of such Title Defect. Buyer shall be deemed to have waived all
Title Defects of which Seller has not been given timely notice by Buyer. To
give Seller an opportunity to begin reviewing and curing Title Defects, Buyer
agrees to give Seller promptly after a Title Defect is discovered written
notice of such Title Defect (which may be preliminary in nature and
supplemented prior to the deadline for notice of Title Defects).

                     (c) Subject to the limitation contained in Section 5.2(a),
a Leasehold Interest affected by a Title Defect shall, at Buyer's option, be
excluded from the Interests to be purchased by Buyer hereunder and the Purchase
Price shall be reduced in accordance with Section 2.2 by an amount equal to the
Allocated Value of such Leasehold Interest unless (i) prior to the Closing
Date, the Title Defect has been removed, (ii) Buyer agrees to waive the
relevant Title Defect and purchase the affected Leasehold Interest
notwithstanding the defect, (iii) Seller agrees, at Buyer's option, to
indemnify Buyer against all losses, costs, expenses and liabilities with
respect to such Title Defect, or (iv) Buyer and Seller agree to an amount by
which the Allocated Value of the Leasehold Interest has been reduced and the
Purchase Price is reduced by such amount in accordance with Section 2.2.

                     (d) If a Leasehold Interest is excluded from the Interests
to be purchased by Buyer hereunder on account of a Title Defect in accordance
with Section 5.2(c), or if the Purchase Price is reduced on account of a Title
Defect in accordance with Section 5.2(c)(iv), the Seller shall have ninety (90)
days after the Closing Date (the "Cure Period") to cure the Title Defect at
Seller's cost. If by such date the Seller has cured the Title Defect to Buyer's
reasonable satisfaction, in the case of a Leasehold Interest that was excluded,
the Buyer shall be required to purchase the Leasehold Interest and pay Seller
the amount by which the Purchase Price was reduced as a result of the exclusion
of the Leasehold Interest and, in the case of the reduction of the Purchase
Price in accordance with Section 5.2(c)(iv), the Buyer shall be required to pay
to the Seller the amount by which the Purchase Price was reduced on account of
the Title Defect. Such transfers and payments shall take place within ten (10)
days following the end of the Cure Period or when payments are made in
connection with the Final Settlement Date under Section 9.1, whichever is
later.

                                      18
<PAGE>   20
5.3        Casualty Loss.


                     If, subsequent to the date of this  Agreement and prior
to the Closing, all or any material portion of the Interests to be conveyed to
Buyer at the Closing is destroyed by fire or other casualty, is taken in
condemnation or under the right of eminent domain, or proceedings for such
purposes are pending or threatened, Buyer shall purchase such Interests
notwithstanding any such destruction, taking, or pending or threatened taking,
and the Purchase Price shall not be adjusted. At the Closing, Seller shall pay
to Buyer all sums paid to Seller by third parties (including insurance claims)
by reason of the destruction or taking of such Interests to be assigned to
Buyer, and shall assign, transfer and set over unto Buyer all of the right,
title and interest of Seller in and to any unpaid awards or other payments from
third parties (including insurance companies) arising out of the destruction,
taking or pending or threatened taking as to such Interests to be conveyed to
Buyer. Seller shall not voluntarily compromise, settle or adjust any material
amounts payable by reason of any destruction, taking, pending or threatened
taking as to the Interests to be conveyed to Buyer without first obtaining the
written consent of Buyer.



6.         ENVIRONMENTAL DEFECTS.

6.1        Environmental Defects.

                     (a) Buyer shall give Seller  written  notice of any 
material Environmental Conditions or Violations of Environmental Laws affecting
the Interests ("Environmental Defects") and provide evidence thereof on or
before January 25, 1999 at 5:00 p.m., Central Time ("Environmental Defect
Notice"). Such notice shall include (i) a description of the Environmental
Defect, (ii) the Allocated Value of the Leasehold Interest affected by such
Environmental Defect, (iii) the amount by which Buyer believes the Allocated
Value of such Leasehold Interest has been reduced because of such Environmental
Defect and (iv) supporting documents reasonably necessary for Seller or its
agents to verify the existence of such Environmental Defect. For the purpose of
this Section, an Environmental Condition or Violation of Environmental Laws
shall be "material" only if the cost to remediate a condition of an Interest or
the fine or penalty associated with the same is, or is reasonably expected to
be, in excess of $50,000.00. Buyer shall treat all information regarding any
adverse Environmental Conditions and Violation of Environmental Law as
confidential whether material or not and shall not make any contact with any
governmental authority regarding the same without Seller's written consent
prior to the Closing Date except as required by law except as Buyer may be
required or desire as an owner and/or operator of the Interests.

6.2        Environmental Defect Adjustments.

                     (a) On or before Closing, with respect to each 
Environmental Defect asserted in Buyer's Environmental Defect Notice, Seller
and Buyer may (i) agree upon an adjustment to the Purchase Price which
adjustment shall reflect the cost to remedy such Environmental Defect, (ii)
with Buyer's approval, and subject to Buyer's satisfaction, remediate the
Environmental Defect at Seller's cost, or (iii) remove that portion of the
Interest affected from the Interests being conveyed and adjust the Purchase
Price accordingly. If the parties cannot agree on a course of action, option
(iii) above shall apply.

                     (b) If an Interest is excluded from the Interests to be
purchased by Buyer hereunder on account of a Environmental Defect in accordance
with Section 6.2(a)(iii), or if the Purchase Price is reduced on account of a

                                      19
<PAGE>   21

Environmental Defect in accordance with Section 6.2(a)(i), the Seller shall
have ninety (90) days after the Closing Date to cure the Environmental Defect
(the "Cure Period") at its cost. If by such date the Seller has cured the
Environmental Defect to Buyer's reasonable satisfaction, in the case of an
Interest that was excluded in accordance with Section 6.2(a)(iii), the Buyer
shall be required to purchase the Interest and pay Seller the amount by which
the Purchase Price was reduced as a result of the exclusion of the Interest
and, in the case of the reduction of the Purchase Price in accordance with
Section 6.2(a)(i), the Buyer shall be required to pay to the Seller the amount
by which the Purchase Price was reduced on account of the Environmental Defect.
Such transfers and payments shall take place within ten (10) days following the
end of the Cure Period or, if later, when payments are made in connection with
the Final Settlement Date under Section 9.1.

           6.3       Definitions.

                     (a) "Environmental Condition" shall mean any existing 
condition with respect to the soil, subsurface, surface waters, groundwater,
atmosphere or any environmental medium, whether or not yet discovered which
could result in any damage, loss, cost, expense or claim against Seller with
respect to the Interests, including, without limitation, those relating to
waste materials and/or hazardous substances and including brine spills or
releases of chemical substances.


                     (b) "Environmental Laws" shall mean all laws, statutes,
ordinances, permits, orders, judgments, rules or regulations which are
promulgated, issued or enacted by a governmental entity or tribal authority as
of the Effective Time having appropriate jurisdiction relating to the
protection of the public health, welfare, and the environment, that are in
effect as of the Effective Time, including, without limitation, those that
relate to, (a) the prevention of pollution or environmental damage, (b) the
remediation of pollution or environmental damage, or (c) the protection of the
environment generally; including without limitation, the Clean Air Act, as
amended, the Comprehensive Environmental Response, Compensation and Liability
Act of 1980, as amended, the Federal Water Pollution Control Act (Clean Water
Act), as amended, the Resource Conservation and Recovery Act of 1976, as
amended, the Safe Drinking Water Act, as amended, the Toxic Substance Control
Act, as amended, the Superfund Amendments and Reauthorization Act of 1986, as
amended, the Hazardous and the Solid Waste Amendments Act of 1984, as amended,
the Oil Pollution Act of 1990, as amended, and applicable rules and regulations
of the Minerals Management Service and (d) any judicial or administrative order
or judgment or written administrative request to which Seller is a party or
which is applicable to Seller or the interests (whether or not by consent), and
any provision or condition of any permit (including, without limitation, permit
modifications and permit applications), license or other governmental operating
authorization, relating to (i) protection of the environment, persons or the
public welfare from actual or potential exposure (or the effects of exposure to
any actual or potential spill or release (whether past or present) of, or
regarding the manufacture, processing, production, gathering, transportation,
importation, use, treatment, storage or disposal of any chemical, raw material,
pollutant, contaminant or hazardous or non-hazardous substance or waste,
including, without limitation, petroleum substances; or (ii) occupational or
public health, safety or nuisance.

                      (c) "Violation of Environmental Laws" shall mean the
violation of or failure to meet specific objective requirements or standards
that are clearly applicable to the Interests under applicable Environmental
Laws where such requirements or standards are in effect as of the Effective
Time, without regard to compliance with good or desirable operating practices
or standards that may be employed or adopted by other oil or gas well operators
or recommended by a governmental authority.

7.         CONDITIONS TO CLOSING

                                      20
<PAGE>   22
7.1        Seller's Conditions.

                     The obligations of Seller at the Closing are subject, at 
the option of Seller, to the satisfaction at or prior to the Closing of the
following conditions:


                     (a) All representations and warranties of Buyer contained
in this Agreement shall be true in all material respects at and as of the
Closing as if such representations and warranties were made at and as of the
Closing, and Buyer shall have performed and satisfied all material agreements
in all material respects required by this Agreement to be performed and
satisfied by Buyer, at or prior to the Closing; and Seller shall have received
a certificate, signed by an authorized officer of Buyer, to such effect.

                     (b) No order shall have been entered by any court or
governmental agency having jurisdiction over the parties or the subject matter
of this Agreement that restrains or prohibits the purchase and sale
contemplated by this Agreement and which remains in effect at the time of such
Closing.


                     (c) The aggregate sum of Title Defect adjustments and
Environmental Defect adjustments (whether on account of Leasehold Interest
being excluded or Leasehold Interest being transferred as to which an
adjustment to the Purchase Price was agreed upon) does not exceed 10% of the
Purchase Price.



                     (d) Seller shall have received from counsel for Buyer an
opinion dated as of the Closing Date, in form and substance reasonably
satisfactory to Seller with respect to the matters addressed in Sections
3.2(a)-(d) hereof (but not as to Section 3.2(b)(ii) as to which Buyer shall
deliver an Officer's Certificate in form and substance reasonably satisfactory
to Seller).



7.2        Buyer's Conditions.


                     The obligations of Buyer at the Closing are subject, at
the option of Buyer, to the  satisfaction at or prior to the Closing of the
following conditions:



                     (a) All  representations of Seller contained in this
Agreement (without reference to any supplements or additions to the Exhibits or
Schedules provided by Seller to Buyer after the date of execution of this
Agreement) shall be true in all material respects at and as of the Closing as
if such representations were made at and as of the Closing, and Seller shall
have performed and satisfied all material agreements in all material respects
required by this Agreement to be performed and satisfied by Seller at or prior
to the Closing; and Buyer shall have received a certificate signed by an
authorized officer of Seller to such effect.



                     (b) No order shall have been entered by any court or
governmental agency having jurisdiction over the parties or the subject matter
of this Agreement that restrains or prohibits the purchase and sale
contemplated by this Agreement and which remains in effect at the time of such
Closing.

                                      21
<PAGE>   23

                     (c) The aggregate sum of Title Defect adjustments and
Environmental Defect adjustments (whether on account of Leasehold Interest
being excluded or Leasehold Interest being transferred as to which an
adjustment to the Purchase Price was agreed upon) does not exceed 10% of the
Purchase Price.



                     (d) Buyer shall have received from counsel for Seller an
opinion dated as of the Closing Date, in form and substance reasonably
satisfactory to Buyer (i) with respect to the matters addressed in Sections
3.1(a)-(d) hereof (but not as to Section 3.1(b)(ii) as to which Seller shall
deliver an Officer's Certificate in form and substance reasonably satisfactory
to Buyer) and (ii) to the effect that the Bills of Sale, Assignments and
Conveyances are sufficient in form to vest in Buyer title to all of the
Leasehold Interests, assuming valid recordation and/or approval thereof in the
appropriate land records or agencies.



                     (e) Buyer shall have received from Seller, in recordable
form, duly executed, acknowledged and, if necessary, paraphed releases of all
liens and encumbrances identified in SCHEDULE 3.1(G) as they relate to the
Interests.



8.         CLOSING.

8.1        Date of Closing.


                     Unless the parties agree otherwise in writing  and 
subject to the conditions  stated in this  Agreement, the consummation 
of the transactions contemplated hereby (the "Closing") shall be
held on or before February 1, 1999 or on such other date as the parties may
mutually agree, provided that the conditions set forth in Articles 6 and 7 have
been or may be satisfied or waived. The date the Closing actually occurs is
called the "Closing Date."



8.2        Place of Closing.


                     The Closing shall be held at the offices of Seller in
Lafayette, Louisiana or at such other place as Buyer and Seller may agree 
in writing.



8.3        Closing Obligations.


                     At Closing, the following events shall occur, each being a
condition precedent to the others and each being deemed to have occurred 
simultaneously with the others:

                                      22
<PAGE>   24

                    (a) Seller shall execute, acknowledge and deliver to Buyer:



                               (1) one or more assignments, bills of sale and
           conveyances (in sufficient counterparts to facilitate recording) in
           substantially the form of EXHIBIT B attached hereto (the
           "Assignments, Bills of Sale and Conveyances") conveying to Buyer the
           Interests;



                               (2) one or more assignments and bills of sale
           conveying a 50% interest in the contracts identified as item number
           61 on EXHIBIT A-IV relating to the Johnson Bayou facility and
           contract identified as item number 6 on EXHIBIT A-IV relating to the
           Mobil storage fee(such contracts being further identified in EXHIBIT
           A-IV), and the Seismic Data; and



                               (3) title curative and other documents Seller 
           may have elected to deliver  pursuant to Section 5.2(c)(i).



                     (b) Seller and Buyer shall execute and deliver a
settlement statement, prepared in accordance with this Agreement and generally
accepted accounting principles (the "Preliminary Settlement Statement"),
prepared by Seller that shall set forth the Preliminary Purchase Price and each
adjustment and the calculation of such adjustments used to determine such
amount, using estimates thereof in each case in which the actual amount may not
then be determined. Seller shall provide Buyer with the Preliminary Settlement
Statement five (5) days prior to Closing for Buyer's review and approval. The
term "Preliminary Purchase Price" shall mean the Purchase Price, adjusted as
provided in Section 2.2, using for such adjustments the best information then
available.



                     (c) Buyer shall deliver to Seller the Preliminary Purchase
Price by direct bank or wire transfer in immediately available federal funds.



                     (d) Seller shall deliver to Buyer exclusive possession of
the Interests.



                     (e) Seller and Buyer shall execute, acknowledge and
deliver transfer orders or letters in lieu thereof directing all purchasers 
of production to make payment to Buyer of proceeds attributable to production
from the Interests assigned to Buyer.



                     (f) Buyer shall prepare such notices to third-party
operators of the change in ownership of the Interests from Seller to Buyer and
such notices of change in operatorship for those Seller-operated Wells for
which Buyer has taken over operations as are reasonable and customary in the
industry.


                                      23
<PAGE>   25

                     (g) Seller and Buyer shall execute and deliver, for each
Field described in EXHIBIT C-I, an operating agreement in substantially the 
form of EXHIBIT C attached hereto and Designation of Operator forms 
designating Buyer as the operator of each of the Leases.



                     (h) Seller and Buyer shall exchange legal opinions and
officers' certificates as provided for in Sections 7.1(a) and (d) and 7.2(a)
and (d).



                     (i) Seller shall deliver to Buyer, in recordable form,
duly executed, acknowledged, and, if necessary, paraphed releases of all liens
and encumbrances identified in SCHEDULE 3.1(G) as they relate to the Interests.



                     (j) Seller shall deliver to Buyer any updates or 
supplements to any of the Exhibits or Schedules hereto.



                     (k) The parties shall execute such other documents,
notices, waivers, agreements and writings as are necessary or appropriate in 
order to consummate the Acquisition and carry out the intents and purposes of
this Agreement.



9.         OBLIGATIONS AFTER CLOSING.

9.1        Post-Closing Adjustment Procedure.

                     As soon as  practicable  after the Closing Date,  but no 
later than 90 days after the Closing Date, Seller shall prepare and deliver to
Buyer, in accordance with this Agreement and generally accepted accounting
principles, a statement (the "Final Settlement Statement") setting forth each
Purchase Price adjustment or payment that was not finally determined as of the
Closing Date and showing the calculation of such adjustments. Within fifteen
days after receipt of the Final Settlement Statement, Buyer shall deliver to
Seller a written report containing any changes that Buyer proposes be made to
the Final Settlement Statement. The parties shall undertake to agree with
respect to the amounts due pursuant to such post-closing adjustment no later
than fifteen days after Seller has received Buyer's proposed changes. The date
upon which such agreement is reached, or upon which the Final Purchase Price is
established, shall be called the "Final Settlement Date." If (i) the Final
Purchase Price is more than the Preliminary Purchase Price, Buyer shall pay in
immediately available federal funds the amount of such difference to Seller or
to Seller's account (as designated by Seller), or (ii) the Final Purchase Price
is less than the Preliminary Purchase Price, Seller shall pay in immediately
available federal funds the amount of such difference to Buyer or to Buyer's
account (as designated by Buyer). Payment by Buyer or Seller shall be made
within five days after the Final Settlement Date.



9.2        Records.

                                      24
<PAGE>   26

                     Within a  reasonable  period of time,  not to exceed ten 
(10) days, after the Closing Date, Seller shall make available to Buyer
originals of the Records and Seismic Data, except that, with respect to
interpretive data generated by Seller that pertains to the subsurface area
directly below the Leases, Seller shall provide copies thereof to Buyer. Seller
shall have the right to retain copies of all Records and Seismic Data. Seller
shall use commercially reasonable efforts to obtain a waiver of prior
contractual restrictions in order to make available Records to Buyer. All
copying and reproduction shall be at Buyer's expense, shall be conducted by a
company mutually acceptable to Buyer and Seller, and shall be carried out in a
manner so as to cause Buyer and Seller a minimum of inconvenience.



9.3        Further Assurances.

                     After Closing, Seller and Buyer shall execute, acknowledge
and deliver or cause to be executed,  acknowledged and delivered such 
instruments, and shall take such other action as may be necessary or advisable,
to carry out their obligations under this Agreement and under any document,
certificate or other instrument delivered pursuant hereto.



9.4        Assumption and Retention of Obligations.

                     (a) SELLER  EXPRESSLY RETAINS RESPONSIBILITY FOR AND 
AGREES TO PAY, PERFORM, FULFILL AND DISCHARGE ALL CLAIMS, COSTS, EXPENSES,
LIABILITIES AND OBLIGATIONS THAT MEET BOTH OF THE FOLLOWING REQUIREMENTS: (I)
THEY ACCRUE OR RELATE TO THE OWNING, DEVELOPING, EXPLORING, OPERATING AND
MAINTAINING OF THE INTERESTS CONVEYED TO BUYER AT THE CLOSING AND (II) THEY
RELATE TO PERIODS PRIOR TO THE EFFECTIVE TIME (INCLUDING, WITHOUT LIMITATION,
THOSE FOR ENVIRONMENTAL DAMAGE, INCLUDING WITHOUT LIMITATION, THOSE MATTERS SET
FORTH ON SCHEDULE 3.1(J), AND FURTHER INCLUDING, WITHOUT LIMITATION, PAYMENT OF
ROYALTIES AND OVERRIDING ROYALTIES, AND ALL OBLIGATIONS ARISING UNDER THE
CONTRACTS), PROVIDED THAT, AS TO ENVIRONMENTAL DAMAGE ONLY, SUCH CLAIMS, COSTS,
EXPENSES, LIABILITIES AND OBLIGATIONS ARE ASSERTED BY BUYER OR BY THIRD PARTIES
AGAINST SELLER BY FEBRUARY 1, 2000 AS TO ENVIRONMENTAL DAMAGE.

                     (b) ASSIGNMENT OF THE INTERESTS TO BUYER SHALL CONSTITUTE
AN EXPRESS ASSUMPTION BY BUYER OF, AND BUYER EXPRESSLY AGREES TO PAY, PERFORM,
FULFILL AND DISCHARGE ALL CLAIMS, COSTS, EXPENSES, LIABILITIES AND OBLIGATIONS
THAT MEET BOTH OF THE FOLLOWING REQUIREMENTS: (I) THEY ACCRUE OR RELATE TO THE
OWNING, DEVELOPING, EXPLORING, OPERATING AND MAINTAINING OF THE INTERESTS
CONVEYED TO BUYER AT THE CLOSING AND (II) THEY RELATE TO PERIODS FROM AND AFTER
THE EFFECTIVE TIME (INCLUDING, WITHOUT LIMITATION, THOSE FOR ENVIRONMENTAL
DAMAGE, PAYMENT OF ROYALTIES AND OVERRIDING ROYALTIES AND ALL OBLIGATIONS
ARISING UNDER THE CONTRACTS) OR, AS TO ENVIRONMENTAL DAMAGE, THEY RELATE TO
PERIODS PRIOR TO THE EFFECTIVE TIME FOLLOWING THE EXPIRATION OF SELLER'S
OBLIGATION FOR SUCH PERIODS PURSUANT TO SECTION 9.4(A).

                                      25
<PAGE>   27
                     (c) "ENVIRONMENTAL  DAMAGE" SHALL MEAN ALL CLAIMS, COSTS,
EXPENSES (INCLUDING, WITHOUT LIMITATION, LEGAL FEES, COSTS AND EXPENSES),
FINES, PENALTIES, LIABILITIES AND OBLIGATIONS, INCLUDING REMEDIATION, RESULTING
DIRECTLY OR INDIRECTLY, FROM THE VIOLATION OF ENVIRONMENTAL LAWS OR
ENVIRONMENTAL CONDITION RELATED TO THE USE, OWNERSHIP OR OPERATION OF THE
INTERESTS.



9.5        Indemnification.


                     From and after the Closing Date, Buyer and Seller shall
indemnify each other as follows:



                     (a) SELLER SHALL DEFEND, INDEMNIFY AND SAVE AND HOLD
HARMLESS BUYER, ITS OFFICERS, DIRECTORS, EMPLOYEES AND AGENTS, AGAINST ALL
LOSSES, DAMAGES, CLAIMS, DEMANDS, SUITS, COSTS, EXPENSES, LIABILITIES AND
SANCTIONS OF EVERY KIND AND CHARACTER, INCLUDING, WITHOUT LIMITATION,
REASONABLE ATTORNEYS' FEES, COURT COSTS AND COSTS OF INVESTIGATION, WHICH ARISE
FROM OR IN CONNECTION WITH (I) ANY OF THE CLAIMS, COSTS, EXPENSES, LIABILITIES
AND OBLIGATIONS RETAINED BY SELLER PURSUANT TO SECTION 9.4(A), OR (II) ANY
BREACH BY SELLER OF THIS AGREEMENT.



                     (b) BUYER SHALL DEFEND, INDEMNIFY AND SAVE AND HOLD
HARMLESS SELLER, ITS OFFICERS, DIRECTORS, EMPLOYEES AND AGENTS, AGAINST ALL
LOSSES, DAMAGES, CLAIMS, DEMANDS, SUITS, COSTS, EXPENSES, LIABILITIES AND
SANCTIONS OF EVERY KIND AND CHARACTER, INCLUDING, WITHOUT LIMITATION,
REASONABLE ATTORNEYS' FEES, COURT COSTS AND COSTS OF INVESTIGATION, WHICH ARISE
FROM OR IN CONNECTION WITH (I) ANY OF THE CLAIMS, COSTS, EXPENSES, LIABILITIES
AND OBLIGATIONS ASSUMED BY BUYER PURSUANT TO SECTION 9.4(B), AND (II) ANY
BREACH BY BUYER OF THIS AGREEMENT.



                     (c) THE INDEMNIFICATION PROVISIONS PROVIDED FOR HEREIN
SHALL BE APPLICABLE WHETHER OR NOT THE LOSSES, COSTS, EXPENSES AND DAMAGES IN
QUESTION AROSE SOLELY OR IN PART FROM THE GROSS, ACTIVE, PASSIVE , CONCURRENT,
SIMPLE OR SOLE NEGLIGENCE, OR STRICT LIABILITY OR OTHER FAULT OF ANY
INDEMNIFIED PARTY OR ANY OTHER THEORY OF LIABILITY OR FAULT (WHETHER COMMON OR
STATUTORY) OR EQUITY, INCLUDING WILLFUL MISCONDUCT OF THE PARTY'S AGENTS,
EMPLOYEES OR CONTRACTORS. BOTH PARTIES ACKNOWLEDGE THAT THIS STATEMENT COMPLIES
WITH THE EXPRESS NEGLIGENCE RULE AND IS CONSPICUOUS.

                                      26
<PAGE>   28

                     (d) Seller and Buyer agree promptly to notify the other
party of the making of any demand, the assertion of any claim, the commencement
of any suit, action or proceeding by any third party or of any other condition
or circumstance for which indemnity may be sought under this Section 9.5 prior
to expending or committing to expend funds for which indemnity may be sought or
admitting liability or entering into any form of agreement with any
governmental agency or other third party with regard to a claim for which
indemnity may be sought.



                     (e) Upon receipt of a claim notice from the party seeking
indemnification (the "Indemnified Party") to the party from whom
indemnification is sought (the "Indemnifying Party") with respect to any claim,
the Indemnifying Party or its designated agent or representative may assume the
defense thereof with counsel selected by the Indemnifying Party and reasonably
satisfactory to the Indemnified Party. The Indemnified Party shall cooperate in
all reasonable respects in such defense. Where a claim or action involves
claims with respect to which Buyer indemnifies Seller, and also claims with
respect to which Seller indemnifies Buyer, each party shall have the right to
assume the defense of and hire counsel for that portion of the claim or action
for which it has liability. In such circumstances, the Indemnified Party shall
have the right to employ separate counsel in any action or claim and to
participate in the defense thereof; provided that the fees and expenses of
counsel employed by the Indemnified Party shall be at the expense of the
Indemnifying Party only if the employment and payment of such counsel has been
specifically authorized by the Indemnifying Party.



                     (f) If the Indemnifying Party does not notify the 
Indemnified Party within 60 days after receipt of the claim notice that it
elects to undertake the defense thereof, the Indemnified Party shall have the
right to defend the claim, at the expense of the Indemnifying Party, with
counsel of its own choosing, but the Indemnifying Party shall have the right to
assume the defense of any claim at any time prior to settlement or final
determination thereof. In such event, the Indemnified Party shall notify the
Indemnifying Party to any proposed settlement of any claim. The Indemnifying
Party may reject the settlement proposal, in its reasonable judgment, within 14
days of receipt of such notice. Failure to accept or reject the settlement
proposal within the 14 day period shall be deemed a rejection of the settlement
proposal. The Indemnified Party may settle any case over the objection of the
Indemnifying Party but shall, in so doing, waive any right to indemnity
therefor, but only as to liabilities with respect to which the Indemnifying
Party has recognized its liability. If the Parties jointly agree to a
settlement as to all of their interests but do not agree to an allocation of
such settlement among themselves, either as to damages owing to others or as to
damages owing to the Parties, one settlement executed jointly by the Parties
shall be entered into, reserving each Parties' rights as to allocation. The
dispute regarding allocation shall then be resolved in accordance with the
arbitration procedure set out in Article 11.16 below.



                     (g) After the Closing Date, Seller and Buyer each shall
cooperate fully with the other as to all claims, shall make available to the
other as reasonably requested all information, records and documents relating
to all claims (except to the extent such disclosure subject any legal privilege
or the attorney work/product doctrine to reasonable attack as having been
waived) and shall preserve all such information, records and documents until
the termination of any claim. Seller and Buyer each shall make available to the
other, as reasonably requested, its personnel (including technical and
scientific), agents and other representatives who are responsible for preparing
or maintaining information, records or other documents, or who may have
particular knowledge with respect to any claim.

                                      27
<PAGE>   29

           9.6       RIGHT OF FIRST REFUSAL.

                     (a) It is acknowledged that Seller is retaining a fifty 
percent (50%) working interest in the Leases that are conveyed to Buyer
hereunder (the "Retained Interests"). If Seller intends to sell, transfer,
assign or otherwise dispose of all or substantially all of the Retained
Interests, either by itself or packaged with other properties, Seller shall
promptly give written notice to the Buyer with full information about the
proposed disposition, including, but not limited to, the name and address of
the prospective transferee, the consideration for the transfer and all other
material terms of the offer. The Buyer shall then have an optional prior right,
for a period of fifteen (15) days after receipt of the notice, to elect to
purchase or acquire on the same terms and conditions (or on equivalent terms
for a non-cash transaction), all of the properties that the Seller is proposing
to transfer.

                     (b) If Buyer intends to sell, transfer, assign or
otherwise dispose of all or substantially all of the Leasehold Interests
acquired pursuant to this Agreement, either by itself or packaged with other
properties, Buyer shall promptly give written notice to the Seller with full
information about the proposed disposition, including, but not limited to, the
name and address of the prospective transferee, the consideration for the
transfer and all other material terms of the offer. The Seller shall then have
an optional prior right, for a period of fifteen (15) days after receipt of the
notice, to elect to purchase or acquire on the same terms and conditions (or on
equivalent terms for a non-cash transaction), all of the properties that the
Buyer is proposing to transfer.

                     (c) The rights of first refusal referenced above shall not
exist or apply when a party proposes to (i) mortgage its interest,(ii) merge, 
consolidate or reorganize, or (iii) transfer such interests to a subsidiary 
or affiliate of such party.

                     (d) Such rights of first refusal is personal to the 
parties, are not transferable or heritable and no person other than the parties
hereto who acquires any of the Retained Interests or any of the Leasehold
Interests, as applicable, shall acquire any interest in these rights of first
refusal.

                     (e) As used in this Section 9.6, the term "substantially
all" shall mean all of the disposing party's interest in and to seventy-five
percent (75%) or more of the Leases comprising the Leasehold Interests or
Retained Interests owned by such party at the time of such proposed sale.

10.        TERMINATION OF AGREEMENT.

10.1       Termination.


           This Agreement and the transactions contemplated hereby may be
terminated in the following instances:


                     (a) By Seller if any of the conditions set forth in 
Section 7.1 is not satisfied in all material respects or waived on or before 
February 1, 1999.



                     (b) By Buyer if any of the conditions set forth in
Section 7.2 is not satisfied in all material respects or waived on or before 
February 1, 1999.

                                      28
<PAGE>   30
                     (c) At any time by the mutual written agreement of Buyer
and Seller.



10.2       Liabilities Upon Termination or Breach.

                     (a) In the event of the termination of this Agreement by 
Seller in accordance with Section 10.1(a), Seller shall have no liability
hereunder of any nature whatsoever to Buyer, including any liability for
damages. If Buyer terminates this Agreement in accordance with Section 10.1(b)
above, it shall have no liability hereunder of any nature whatsoever to the
Seller, including any liability for damages.



                     (b) Seller shall have no obligation or liability under
this Agreement or in connection with or with respect to transactions
contemplated by this Agreement for (i) any breach, misrepresentation or
noncompliance with respect to any representation, warranty, covenant or
obligation, if such breach, misrepresentation or noncompliance was disclosed by
Seller on a Schedule or Exhibit hereto in the manner provided in this Agreement
for such disclosure, as such Schedule or Exhibit may have been supplemented
from time to time, at or before the Closing, (ii) any misrepresentation or
breach of warranty if Buyer had Knowledge of the relevant facts at or before
the Closing, or (iii) any matter asserted by Buyer as a Title Defect or
Environmental Defect as to which a Purchase Price adjustment was made. For
purposes of this Section 10.2(b) the term "Knowledge" excludes knowledge by way
of oral communications by Seller to Buyer's employees or representatives. It is
further understood and agreed by the parties that nothing in this Section
10.2(b) shall affect Buyer's and Seller's rights and obligations under Section
9.4.



                     (c) Except as provided above in this Section 10.2, nothing
contained herein shall be construed to limit Seller's or Buyer's legal or 
equitable remedies in the event of breach of this Agreement.



11.        MISCELLANEOUS.

11.1       Employee Matters.

                     Buyer shall have the right, but not the obligation, to 
solicit the field employees of Seller (and any other employees of Seller that
Seller identifies in writing) ("Employees"), and shall have the right, but not
the obligation, to offer employment to and hire any such Employees. If Buyer
hires any Employee, the terms of employment shall be at Buyer's discretion.

11.2       Exhibits.


                     The Exhibits referred to in this Agreement have been
separately bound and executed by the duly authorized representatives of Buyer
and Seller. All of such Exhibits are hereby incorporated in this Agreement by
reference and constitute a part of this Agreement. Each party to this Agreement
has received a complete set of Exhibits prior to and as of the execution of
this Agreement.

                                      29
<PAGE>   31

11.3       Expenses.


                     Except as otherwise specifically provided, all fees, 
costs and expenses incurred by Buyer or Seller in negotiating this Agreement or
in consummating the transactions contemplated by this Agreement shall be paid
by the party incurring the same, including, without limitation, legal and
accounting fees, costs and expenses.



11.4       Notices.


                     All notices and communications required or permitted 
under this Agreement shall be in writing and any communication or delivery
hereunder shall be deemed to have been duly made when personally delivered to
the individual indicated below, or if mailed, when received by the party
charged with such notice and addressed as follows:



                     IF TO BUYER:

                     APACHE CORPORATION
                     2000 Post Oak Boulevard, Suite 100
                     Houston, Texas 77056-4400
                     Attention:   Lisa A. Floyd
                                  Vice President - Business Development

                     WITH A COPY TO: Vice President and General Counsel

                     IF TO SELLER:

                     PETSEC ENERGY INC.
                     143 Ridgeway Drive, Suite 113
                     Lafayette, Louisiana 70503-3402
                     Attention:   James E. Slatten III
                                  Manager--Land and Legal

                     WITH A COPY TO:

                     GORDON, ARATA, McCOLLAM, DUPLANTIS
                               & EAGAN, L.L.P.
                     201 St. Charles Avenue, Suite 4000
                     New Orleans, Louisiana 70170-4000
                     Attention:   Cathy E. Chessin

                     Any party may, by written notice so delivered to the other
parties, change the address or individual to which delivery shall thereafter 
be made.


11.5       Wire Transfer Instructions.

                                      30
<PAGE>   32
                     Funds payable to Seller shall be wired to:

                     The Chase Manhattan Bank, N.A.
                     New York
                     ABA No.: 021000021
                     For the Account of Petsec Energy Inc.
                     Account No:  910-2-772226

11.6       Amendments.

                     This Agreement may not be amended nor any rights 
hereunder  waived except by an instrument in writing signed by the party 
to be charged with such amendment or waiver and delivered by such
party to the party claiming the benefit of such amendment or waiver.



11.7       Assignment.


                     Neither party may assign all or any  portion of its 
rights, or delegate all or any portion of its duties hereunder, unless it
continues to remain liable for the performance of its obligations hereunder,
and obtains the prior written consent of the other party, which consent shall
not be unreasonably withheld. Buyer may assign all or any portion of its
rights, duties and obligations hereunder to one or more of its subsidiaries,
provided, however, that Buyer shall remain primarily liable for the performance
of all of Buyer's obligations to be performed hereunder. Nothing contained in
this Agreement, express or implied, shall confer on any person other than the
parties hereto or their respective successors and permitted assigns, any
rights, remedies, obligations or liabilities under or by reason of this
Agreement.



11.8       Announcements.


                     Seller and Buyer shall consult with each other with regard
to all press releases and other announcements issued after the date of this
Agreement and prior to the Closing Date concerning this Agreement or the
transactions contemplated hereby and, except as may be required by applicable
laws or the applicable rules and regulations of any governmental agency or
stock 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.



11.9       Headings.

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

                                      31
<PAGE>   33
11.10      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 taken together shall constitute but one and the same 
instrument.



11.11      References.

                     References made in this Agreement, including use of a 
pronoun, shall be deemed to include where applicable, masculine, feminine,
singular or plural, individuals, partnerships or corporations. As used in this
Agreement, "person" shall mean any natural person, corporation, partnership,
trust, estate or other entity. Where the context requires, the term "Seller"
refers to the Seller and each person it controls.

11.12      Governing Law.

                     This Agreement and the transactions contemplated hereby 
shall be construed in accordance with, and governed by, the substantive laws of
the State of Louisiana, without any effect being given to principles of
conflicts of laws.

11.13      Entire Agreement.


                     This Agreement (including the Exhibits hereto), together
with that certain Indemnity Agreement by Buyer and Seller dated December 23,
1998 (the "Indemnity Agreement") and that certain Letter Agreement entered into
by Buyer and Petrie Parkman & Co., acting on behalf of Seller, dated July 16,
1998 (the "Confidentiality Agreement") constitute the entire understanding
among the parties with respect to the subject matter hereof, superseding all
negotiations, prior discussions and prior agreements and understandings
relating to such subject matter. It is understood and agreed that upon Closing,
(a) the Confidentiality Agreement between Buyer, Seller and Petrie Parkman &
Co. shall, with respect to the Interests, terminate as of the Closing Date, but
with respect to any other properties covered thereby not included within the
Interests, remain in full force and effect in accordance with its terms and is
not superseded or modified by this Agreement and (b) the Indemnity Agreement
shall remain in full force and effect and is not superseded or modified by this
Agreement.

                                      32
<PAGE>   34
11.14      Parties in Interest.


                     This Agreement, including the representations and 
warranties and indemnities  hereunder,  shall be binding upon,
and shall inure to the benefit of, the parties hereto, and their respective
successors and assigns, and nothing contained in this Agreement, express or
implied, is intended to confer upon any other person or entity any benefits,
rights or remedies.

11.15      Survival.


                     The  representations, warranties, covenants, agreements 
and indemnities provided for in this Agreement shall survive the Closing,
subject to the following limitations: (a) the representations and warranties
provided for in Section 3.1(r) hereof shall terminate on the Closing Date, (b)
the representations and warranties provided for in Sections 3.1(b), (i) and (j)
shall survive the Closing until and terminate on February 1, 2000 and (c) the
remaining representations and warranties contained in Section 3.1 and the
representations and warranties contained in Section 3.2 shall survive the
Closing and, except as provided herein, shall not be extinguished by the
doctrine of merger by deed or any similar doctrine, and no waiver, release, or
forbearance of the application of the provisions of those sections in any given
circumstance shall operate as a waiver, release, or forbearance of the
provisions of the sections as to any other circumstances.



11.16      Arbitration.

                     (a) In the event of a dispute regarding this Acquisition,
the parties agree to jointly select a board of arbitrators who are generally
knowledgeable about the oil and gas industry and the nature of the issues to be
arbitrated, which board shall be the sole arbitrator to hear and decide all
matters that are subject to arbitration under this Agreement. Either party may
notify the other that a dispute is to be resolved pursuant to this Section
11.16. Within five (5) days after the receipt by a party of notice from the
other, Seller shall by written notice name one arbitrator and Buyer shall by
written notice name one arbitrator. The two arbitrators so appointed shall name
the third arbitrator within 10 days after the selection of the second
arbitrator. If they fail to do so, then either party can apply to the Federal
District Court of the Eastern District of Louisiana, New Orleans Division (the
"Court") to appoint an arbitrator. The arbitrators selected to act under this
Section 11.16 shall be generally knowledgeable about the oil and gas industry
and shall be qualified by education, experience or training to render a
decision upon the issues in dispute.

                     (b) Any arbitration hearing shall be held in New Orleans,
Louisiana, unless another place is determined to be mutually acceptable to 
the arbitrators, the Buyer and the Seller.



                     (c) The arbitrators shall settle all disputes concerning
matters for which this Agreement requires the use of arbitration in accordance
with the rules set forth in Title 9, United States Code "Arbitration" (the
"U.S. Federal Arbitration Act") in accordance with the then current rules of
the American Arbitration Association, or any successor (the "Rules") to the
extent such Rules do not conflict with the terms of this Agreement, and the
Louisiana state rules of evidence and civil procedure shall apply.

                                      33
<PAGE>   35

                     (d) The arbitrators promptly shall hear and determine
(after giving the parties due notice of hearing and reasonable opportunity to
be heard) the questions submitted and shall render a decision within sixty (60)
days after notifying the parties that the arbitration hearings have been closed
or, if oral hearings have been waived, from the date of transmittal of the
parties' final statements and proofs to the arbitrators.



                     (e) The arbitrators shall not have jurisdiction or
authority to add to, detract from or alter in any way the provisions of the
Agreement. Pending the final decision of the arbitrators of any dispute, both
parties will proceed diligently with performance of all contract obligations,
including the payment of all sums not in dispute, required by the Agreement.
Notwithstanding the foregoing, the parties reserve the right to apply to any
court of competent jurisdiction for the purpose of obtaining security or other
provisional relief to satisfy or effectuate an eventual arbitration award,
including with limitation, attachment and injunctive relief. The commencement
of any action for such relief in aid of arbitration shall not constitute a
waiver of the right to arbitration nor shall it prejudice in any way the right
to proceed to arbitration.


                     (f) If an arbitrator dies, resigns or is otherwise unable
to perform his duties as an arbitrator, another arbitrator shall be selected in
accordance with the procedures set forth under this Section 11.16. The
arbitrators may in all matters act through a majority of its members on each
matter if unanimity is not attained. It shall not be necessary that the same
majority agree on each and every item. The arbitrators shall not have any
authority to award punitive damages.

                     (g) The written decision or award of the arbitrator shall
be final and binding upon the parties and the parties shall abide by and comply
with such decision and a judgment may be rendered upon such decision or award
in a court of competent jurisdiction. Buyer and Seller shall equally bear the
cost of the services and expenses of the arbitrator and all other costs of the
arbitration proceedings, except to the extent attorneys' fees, and interest are
awarded by the arbitrator to one Party.

11.17      Tax Matters.

                     (a) PAYMENT AND APPORTIONMENT OF REAL PROPERTY TAXES AND 
PERSONAL PROPERTY TAXES.  With respect to Taxes:

                               (1) REAL AND PERSONAL PROPERTY TAXES. All ad
                     valorem taxes, real property taxes and personal property
                     taxes ("Real and Personal Property Taxes") for the year in
                     which the Effective Time occurs shall be apportioned as of
                     the Effective Time between Seller and Buyer. Seller shall
                     be liable for the portion of such Real and Personal
                     Property Taxes based upon the number of days in the year
                     occurring prior to the Effective Time, and Buyer shall be
                     liable for the portion of such taxes based upon the number
                     of days in the year occurring on and after the Effective
                     Time. For any year in which an apportionment is required,
                     Buyer shall file all required reports and returns incident
                     to these taxes and shall remit to the appropriate taxing
                     authorities all such taxes assessed for the year in which
                     the Effective Time occurs that are not paid by Seller as
                     of the Closing Date. Seller shall pay to Buyer, at the
                     time of Buyer's remittance, Seller's share of such taxes
                     to the extent such amounts were not credited to Buyer in
                     calculating adjustments in the Purchase Price in Sections
                     2.1 or 2.2 (the "Adjusted Price").

                                      34
<PAGE>   36
                               (2) LIABILITY AND RIGHT TO PURCHASE CLAIMS.
                     Seller shall retain liability for all adjustments,
                     examinations or claims relating to taxes that are paid by
                     Seller and that are allocated to Seller pursuant to this
                     Section 11.17. Buyer shall retain liability for all
                     adjustments, examinations or claims relating to taxes that
                     are paid by Buyer and that are allocated to Buyer pursuant
                     to this Section 11.17. Seller shall administer and defend
                     any examination, claim or adjustments arising in
                     connection with taxes to be paid by Buyer but which are
                     allocated to Seller pursuant to this Section 11.17.

                     (b) OTHER TAXES. All excise, production, severance, gross
receipts, conservation, oil and gas severance and other similar taxes relating
to production of hydrocarbons attributable to the Interests prior to the
Effective Time shall be allocated to Seller, and all such taxes relating the
Interests on or after the Effective Time shall be allocated to Buyer. Buyer
shall file any reports or returns not filed as of the Closing, and shall remit
to the proper taxing authorities any such taxes allocated to Seller, but not
paid as of the Closing. Seller shall pay Seller's share of such taxes at the
time Buyer remits such taxes, to the extent such amounts were not credited to
Buyer in the Purchase Price as adjusted pursuant to Section 2.2.

                     (c) SALES TAXES. The Purchase Price does not include any 
sales taxes or other transfer taxes imposed in connection with the sale of the
Interests. Buyer shall pay any sales tax or other transfer tax, as well as any
applicable conveyance, transfer and recording fee, and real estate transfer
stamps or taxes imposed on the transfer of the Interests pursuant to the
Agreement. If Buyer is of the opinion that it is exempt from the payment of any
such sales tax or other transfer tax, Buyer shall furnish to Seller the
appropriate tax exemption certificate.

                     (d) TAX PROCEEDINGS. In the event Buyer or any of Buyer's
affiliates receive notice of any examination, claim, adjustment or other
proceeding relating to the liability for taxes of or with respect to Seller for
any period Seller is or may be liable under Section 11.17(a)(2), Buyer shall
notify Seller in writing within thirty (30) days of receiving notice thereof.
As to any such taxes for which Seller is or may be liable under Section
11.17(a)(2), Seller shall, at Seller's expense, control or settle the contest
of such examination, claim adjustment or other proceeding, and shall indemnify
Buyer against all losses, damages, costs, expenses, liabilities, claims,
demands, penalties, fines, assessments, settlements, and any related expenses
in connection therewith. In the event Seller or any of Seller's affiliates
receive notice of any examination, claim, adjustment, or other proceeding
relating to the liability for taxes of or with respect to Buyer for any period
Buyer is or may be liable under Section 11.17(a)(2), Seller shall notify Buyer
in writing within thirty (30) days of receiving notice thereof. As to any such
taxes for which Buyer is or may be liable under Section 11.17(a)(2), Buyer
shall, at Buyer's expense, control or settle the contest of such examination,
claim, adjustment, or other proceeding, and shall indemnify Seller against all
losses, damages, costs, expenses, liabilities, claims, demands, penalties,
fines, assessments, settlements, and any related expenses in connection
therewith. The parties shall cooperate with each other and with their
respective affiliates in the negotiations and settlement of any proceeding
described in this Section 11.17. Each party shall provide, or cause to be
provided, to the other party necessary authorizations, including powers of
attorney, to control any proceeding which such party is entitled to control.

                     (e) SECTION 1060 VALUE ALLOCATION. Seller and  Buyer  
agree that this transaction is subject to the reporting requirements of Section
1060 of the Internal Revenue Code of 1986, as amended. Therefore, IRS Form
8594, Asset Acquisition Statement, is required to be and will be filed for this
Acquisition. The parties will confer and cooperate in the preparation and
filing of their respective forms to reflect a consistent reporting of the
agreed upon allocation. In that regard, Buyer and Seller further agree that, on
or before the Closing Date, they will mutually agree as to the further

                                      35
<PAGE>   37
allocation of the Allocated Values set forth in Exhibit A-II as to the relative
portion of those values attributable to leasehold costs and tangible equipment
and shall use those allocations for all federal and state income tax matters.

11.18      Suspense Accounts.

                     Seller shall transfer to Buyer within five (5) business
days after Closing all proceeds from production attributable to third party
interests, including royalty and overriding royalty interests owed with respect
to the Interests, that are held by Seller in suspense as of the Closing. Buyer
shall be responsible for proper distribution of all the suspended proceeds to
the parties lawfully entitled to them.

11.19      Severability.

                     If any  provisions of this  Agreement are held to be 
illegal, invalid or unenforceable under present or future laws, such provisions
shall be fully severable, and this Agreement shall be construed and enforced as
if such illegal, invalid or unenforceable provision had never comprised a part
of this Agreement, and the remaining provisions of this Agreement shall remain
in full force and effect and not be affected by the illegal, invalid or
unenforceable provision or by its severance from this Agreement, provided that
both parties hereto may still effectively realize the benefit of the
transactions contemplated hereby.

11.20      Limitation of Liability.

                     The parties do hereby covenant and agree that neither
party shall have any obligations with respect to this Agreement or the 
transactions contemplated hereby or otherwise in connection herewith for any 
indirect, consequential, exemplary or punitive damages.

11.21      Waiver of Jury Trial.

                     SUBJECT TO THE ARBITRATION  PROVISION SET FORTH IN 
SECTION 11.16, THE PARTIES DO HEREBY IRREVOCABLY WAIVE, TO THE FULLEST EXTENT 
PERMITTED BY LAW, ANY AND ALL RIGHT TO A TRIAL BY JURY IN ANY ACTION, SUIT OR
OTHER LEGAL PROCEEDING BASED UPON, ARISING OUT OF OR RELATING TO THIS 
AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

11.22      Jurisdiction and Venue.

                     SUBJECT TO THE ARBITRATION  PROVISION SET FORTH IN
SECTION 11.16, BUYER CONSENTS TO PERSONAL JURISDICTION IN ANY LEGAL ACTION,
SUIT OR PROCEEDING WITH RESPECT TO THIS AGREEMENT IN ANY COURT, FEDERAL OR
STATE, WITHIN NEW ORLEANS PARISH, LOUISIANA HAVING SUBJECT MATTER JURISDICTION
AND WITH RESPECT TO ANY SUCH CLAIM, BUYER IRREVOCABLY WAIVES, TO THE FULLEST
EXTENT PERMITTED BY LAW, ANY CLAIM OR ANY OBJECTION THAT BUYER MAY NOW OR
HEREAFTER HAVE THAT VENUE OR JURISDICTION IS NOT PROPER WITH RESPECT TO ANY
SUCH LEGAL ACTION, SUIT OR PROCEEDING BROUGHT IN SUCH COURT IN NEW ORLEANS
PARISH, LOUISIANA, INCLUDING ANY CLAIM THAT SUCH LEGAL ACTION, SUIT OR
PROCEEDING BROUGHT IN SUCH COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM AND
ANY CLAIM THAT BUYER IS NOT SUBJECT TO PERSONAL JURISDICTION OR SERVICE OF
PROCESS IN SUCH FORUM.

                                      36
<PAGE>   38
                     Executed as of the date first above mentioned.

                                    SELLER:

                                    PETSEC ENERGY INC.


                                    By:             /s/    
                                       -------------------------------------- 
                                    Name:  Ross A. Keogh                      
                                    Title: Vice-President--Finance 
                                             and Administration


                                    BUYER:

                                    APACHE CORPORATION


                                    By:            /s/     
                                       -------------------------------------- 
                                           Lisa A. Floyd
                                           Vice President, Business Development
                                           and E&P Services


                                      37

<PAGE>   1



EXHIBIT 99.1

                               PETSEC ENERGY LTD
                                ACN 000 602 700



1 February 1999

                      PETSEC ENERGY CLOSES ASSET SALE WITH
                               APACHE CORPORATION

Sydney, Australia - Petsec Energy Ltd (ASX: PSA and NYSE: PSJ) today announced
that its wholly owned subsidiary, Petsec Energy Inc., completed the previously
announced sale of a one-half (50%) interest in certain of its properties to
Apache Corporation (NYSE: APA). The sale price was US$68.3 million cash. The
effective date of the transaction was 1 January 1999.

Average net daily production in 1998, specific to the interests sold, was 28.6
million cubic feet of gas and 3,219 barrels of oil.

The funds will be used to repay US$64 million of the existing bank credit
facility, reducing bank debt to US$10 million. The Company's total debt now
stands at US$110 million, of which US$100 million is interest only subordinated
notes maturing in June 2007.

Following the Apache sale, Petsec expects that, in 1999, 75% of its net gas
production will be hedged at US$2.45 per mcf and 35% of its daily net oil
production at US$19.70 per barrel.

Petsec Energy Ltd operates, produces and explores for oil and natural gas in
the shallow waters of the Gulf of Mexico. The Company owns interests in 44
leases, 21 of which are 100% owned, and 23 joint venture leases with Apache
Corporation which are 50% owned.

For further information please contact:

In Australia:                              In USA:

Doug Battersby, Technical Director         Ross Keogh, Chief Financial Officer
Petsec Energy Ltd                          Petsec Energy Ltd
(61) 2 9247 4605 (phone)                   (318) 989 1942 (phone)
(61) 2 9251 2410 (fax)                     (318) 989 7271 (fax)
Level 13, Gold Fields House                143 Ridgeway Drive, Suite 113
1 Alfred Street, Sydney NSW 2000           Lafayette, Louisiana 70503-3402

  Company information is available at Petsec's website http://www.petsec.com

1.    Information in this report which relates to hydrocarbon reserves is based
      on information compiled by a person qualified in accordance with Listing
      Rule 5.11 and accurately reflects the information compiled by that
      person.

2.    Certain statements in this report regarding future expectations and plans
      of the Company may be regarded as "forward-looking statements" within the
      meaning of Section 27A of the USA Securities Act of 1933 and Section 21E
      of the USA Securities Exchange Act of 1934. Although the Company believes
      that its expectations and plans are based upon reasonable assumptions, it
      can give no assurance that its goals will be met. Actual results may vary
      significantly from those anticipated due to many factors, including oil
      and gas prices, operating hazards, drilling risks, environmental risks
      and uncertainties in interpreting engineering and other data relating to
      oil and gas reservoirs, as well as other risks discussed in the Company's
      SEC filings.




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