APACHE CORP
8-K, 1999-05-26
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): May 18, 1999




                               APACHE CORPORATION
               (Exact name of registrant as specified in Charter)

<TABLE>
<S>                                                     <C>                                  <C>
               DELAWARE                                 1-4300                               41-0747868
     (State or Other Jurisdiction                     (Commission                         (I.R.S. Employer
           of Incorporation)                          File Number)                     Identification Number)
</TABLE>


                             2000 POST OAK BOULEVARD
                                    SUITE 100
                            HOUSTON, TEXAS 77056-4400
                    (Address of Principal Executive Offices)


       Registrant's telephone number, including area code: (713) 296-6000


================================================================================
<PAGE>   2
ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS

On April 29, 1999, Apache Corporation ("Apache") signed an asset purchase
agreement and a stock purchase agreement with Shell Offshore Inc. and affiliated
Shell entities ("Shell") to purchase Shell's interest in 22 producing fields and
16 undeveloped blocks located in the Gulf of Mexico. Apache will operate 18 of
the 22 producing fields and also acquire certain production-related assets and
proprietary 3-D seismic data covering over 1,000 blocks in the Gulf of Mexico.
The transaction has an effective date of March 1, 1999, and a purchase price of
$715 million in cash (subject to reduction for production since March 1, 1999
and other adjustments) and one million shares of Apache's common stock, par
value $1.25 per share ("Apache Common Stock").

The properties included in the transaction had estimated proved reserves of
127.3 million barrels of oil equivalent at March 1, 1999, and were approximately
54 percent oil and 46 percent natural gas. The $715 million cash portion of the
purchase price assumes that the other owners of working interests in the Shell
properties will not exercise any of their preferential rights to purchase
portions of the interests Apache has agreed to purchase from Shell. The asset
purchase agreement and the stock purchase agreement are listed under Item 7 as
Exhibits 2.1 and 2.2 and are incorporated herein by reference.

The transaction was closed on May 18, 1999, effective as of March 1, 1999, and
is subject to customary post-closing adjustments and the preferential rights to
purchase noted above. Apache issued a press release, dated May 18, 1999, which
is listed under Item 7 as Exhibit 99.1 and incorporated herein by reference.

The cash portion of the purchase price was funded through a combination of debt
and equity. In separate offerings underwritten by Goldman, Sachs & Co., Apache
raised net proceeds of approximately $655 million through the issuance of (i)
14,950,000 shares of Apache Common Stock and (ii) seven million $2.015
Depositary Shares (the "Depositary Shares") representing Automatically
Convertible Equity Securities, Conversion Preferred Stock, Series C. The balance
of the cash portion of the purchase price was funded under Apache's existing
lines of credit. The final prospectus supplements for the shares of Apache
Common Stock and the Depositary Shares are listed under Item 7 as Exhibits 99.2
and 99.3 and are incorporated herein by reference.

The one million shares of Apache Common Stock issued to Shell pursuant to the
above-referenced stock purchase agreement were not a part of the underwritten
offerings discussed above. Such shares were issued under Apache's Registration
Statement on Form S-4 (Registration No. 33-61669) filed on August 8, 1995 and
amended on September 21, 1995, with the Securities Exchange Commission under the
Securities Act of 1933, as amended.

Other than Apache's negotiations and discussions with representatives of Shell
concerning the transaction described above, there are no material relationships
between Shell and Apache or any of Apache's affiliates, officers or directors,
or any associate of any officer or director of Apache.


                                       1
<PAGE>   3
ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

It is impractical to file financial statements and pro forma financial
information at this time. The Registrant will file such statements and
information as soon as practicable. It is expected that such statements and
information will be filed by amendment to this Form 8-K on or before July 30,
1999.

(c)      EXHIBITS.

<TABLE>
<CAPTION>
EXHIBIT NO.                DESCRIPTION
- -----------                -----------
<S>                        <C>

 2.1*                      Asset Purchase Agreement, dated effective March 1, 1999, between Shell Offshore Inc. and certain
                           affiliated Shell entities, as Seller, and Apache Corporation, as Buyer.

 2.2*                      Stock Purchase Agreement, dated April 29, 1999, between Shell Offshore Inc. and Apache Corporation.

99.1                       Press Release, dated May 18, 1999, "Apache Closes on Purchase of Shell Assets in Gulf of Mexico"
                           (incorporated by reference to Amendment No. 2 on Form 8-K/A to Apache's Form 8-K dated April 29, 1999,
                           filed on May 24, 1999, SEC File No. 1-4300).

99.2                       Final Prospectus Supplement (Common Stock), dated May 12, 1999 (incorporated by reference to Apache's
                           filing pursuant to Rule 424(B)(2) on May 13, 1999, Registration No. 333-75633).

99.3                       Final Prospectus Supplement (Depositary Shares), dated May 12, 1999 (incorporated by reference to
                           Apache's filing pursuant to Rule 424(B)(2) on May 13, 1999, Registration No. 333-75633).
</TABLE>


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

*      filed herewith


                                       2
<PAGE>   4
                                   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 thereunto duly authorized.

                                         APACHE CORPORATION


Date:  May 25, 1999                      /s/ Z. S. KOBIASHVILI
                                         ---------------------------------------
                                         Z. S. Kobiashvili
                                         Vice President and General Counsel


                                       3
<PAGE>   5
                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT NO.                DESCRIPTION
- -----------                -----------
<S>                        <C>

 2.1*                      Asset Purchase Agreement, dated effective March 1, 1999, between Shell Offshore Inc. and certain
                           affiliated Shell entities, as Seller, and Apache Corporation, as Buyer.

 2.2*                      Stock Purchase Agreement, dated April 29, 1999, between Shell Offshore Inc. and Apache Corporation.

99.1                       Press Release, dated May 18, 1999, "Apache Closes on Purchase of Shell Assets in Gulf of Mexico"
                           (incorporated by reference to Amendment No. 2 on Form 8-K/A to Apache's Form 8-K dated April 29, 1999,
                           filed on May 24, 1999, SEC File No. 1-4300).

99.2                       Final Prospectus Supplement (Common Stock), dated May 12, 1999 (incorporated by reference to Apache's
                           filing pursuant to Rule 424(B)(2) on May 13, 1999, Registration No. 333-75633).

99.3                       Final Prospectus Supplement (Depositary Shares), dated May 12, 1999 (incorporated by reference to
                           Apache's filing pursuant to Rule 424(B)(2) on May 13, 1999, Registration No. 333-75633).
</TABLE>


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

*      filed herewith



<PAGE>   1
                                                                     EXHIBIT 2.1


                            ASSET PURCHASE AGREEMENT




                                     BETWEEN


                           SHELL OFFSHORE INC. ("SOI")
                      MIDSTREAM CAPITAL CORPORATION ("MCC")
             SHELL OIL & GAS INVESTMENT LIMITED PARTNERSHIP ("SOGI")
                      SHELL ONSHORE VENTURES INC. ("SOVI")
               SHELL DEEPWATER DEVELOPMENT HOLDINGS INC. ("SDDHI")
                     SHELL FRONTIER OIL & GAS INC. ("SFOGI")
                           SOI FINANCE INC. ("SOIFI")
                         ORLANDO-SOI PARTNERSHIP ("OSP")
               SHELL CONSOLIDATED ENERGY RESOURCES INC. ("SCERI")
                            (COLLECTIVELY, "SELLER")


                                       AND


                               APACHE CORPORATION
                                  ("PURCHASER")





                                 DATED EFFECTIVE
                                  MARCH 1, 1999


<PAGE>   2


<TABLE>
<S>           <C>                                                                             <C>
SECTION 1 - DEFINITIONS / EXHIBITS .............................................................2
         1.1  ACCOUNTING CLOSING DATE ..........................................................2
         1.2  AGREEMENT ........................................................................2
         1.3  AFFILIATE ........................................................................2
         1.4  BUSINESS RECORDS .................................................................3
         1.5  EFFECTIVE TIME ...................................................................3
         1.6  EXHIBITS .........................................................................3
         1.7  SCHEDULE .........................................................................4
         1.8  CLOSING ..........................................................................4
         1.9  CONTRACT RIGHTS ..................................................................5
         1.10 EASEMENTS ........................................................................5
         1.11 GOVERNMENTAL BODY ................................................................5
         1.12 KNOWN/KNOWLEDGE ..................................................................5
         1.13 LEASE ............................................................................5
         1.14 MMS ..............................................................................6
         1.15 NET REVENUE INTEREST..............................................................6
         1.16 OIL & GAS INTERESTS...............................................................6
         1.17 OPERATOR .........................................................................6
         1.18 PLATFORMS & FACILITIES............................................................6
         1.19 PROPRIETARY DATA .................................................................6
         1.20 TERMINATION DATE .................................................................7
         1.21 PARTY ............................................................................7
         1.22 WORKING INTEREST .................................................................7
         1.23 STOCK PURCHASE AGREEMENT..........................................................7
         1.24 HSR ACT ..........................................................................7
SECTION 2 - PURCHASE AND SALE ..................................................................7
         2.1      PURCHASE AND SALE OF ASSETS...................................................7
                           2.1.1 LEASES.........................................................7
                           2.1.2 ASSOCIATED INTERESTS...........................................8
                           2.1.3 WELLS..........................................................8
                           2.1.4 PLATFORMS & FACILITIES.........................................8
                           2.1.5 EASEMENTS......................................................9
                           2.1.6 CONTRACT RIGHTS................................................9
                           2.1.7 PROPRIETARY DATA...............................................9
                           2.1.8 BUSINESS RECORDS..............................................10
         2.2      EXCLUDED ASSETS .............................................................10
                           2.2.1 LICENSED DATA.................................................10
                           2.2.2 TRADE ACCOUNTS AND CAUSES OF ACTION...........................10
                           2.2.3 AFFILIATE AND THIRD PARTY ASSETS..............................11
</TABLE>


                                     Page i
<PAGE>   3


<TABLE>
<S>           <C>                                                                             <C>
                       2.2.4    OTHER EXCLUDED ASSETS.......................................11
         2.3  ASSETS SUBJECT TO EXISTING AGREEMENTS.........................................11
                       2.3.1    EXCLUSIONS..................................................12
         2.4  PURCHASE PRICE ...............................................................12
         2.5  ADDITIONAL CONSIDERATION......................................................13
                       2.5.3    EXCLUSIONS..................................................14
         2.6  TITLE AND RISK OF LOSS........................................................15
         2.7  SPECIFIC PERFORMANCE..........................................................15
         2.8  INSURANCE ....................................................................15
SECTION 3 -   TITLE/GENERAL.................................................................15
         3.1  TITLE MATTERS.................................................................15
         3.2  PHYSICAL CONDITION OF THE ASSETS..............................................16
         3.3  NORM .........................................................................16
         3.4  AVAILABILITY OF DATA..........................................................17
         3.5  PREFERENTIAL RIGHTS AND CONSENTS..............................................17
SECTION 4 -   COVENANTS AND AGREEMENTS .....................................................19
         4.1  COVENANTS AND AGREEMENTS OF SELLER............................................19
         4.2  EMPLOYEE MATTERS .............................................................20
         4.3  REGULATION S-X FINANCIAL DATA.................................................20
         4.4  HSR ACT ......................................................................21
         4.5  GREEN CANYON 89 PRODUCTION PROCESSING.........................................21
SECTION 5 -   CLOSING ......................................................................23
         5.1  CONDITIONS PRECEDENT..........................................................23
                       5.1.1.   HSR APPROVAL................................................23
                       5.1.2.   MAIN PASS 290 FIELD AGREEMENT...............................23
                       5.1.3.   PURCHASER'S CERTIFICATION...................................23
                       5.1.4.   FAILURE OF  CONDITION.......................................23
                       5.1.5.   INTEREST ON PURCHASE PRICE..................................24
         5.2  CLOSING           ............................................................24
         5.3  POST CLOSING OBLIGATIONS......................................................26
                       5.3.1    RECORDING & FILING..........................................26
                       5.3.2    CHANGE OF OPERATOR..........................................26
                       5.3.3    NOTICES TO THIRD PARTIES....................................27
                       5.3.4    DELIVERY OF BUSINESS RECORDS................................27
                       5.3.5    USE OF NAME.................................................28
         5.4  GOVERNMENTAL APPROVALS........................................................28
         5.5  OPERATIONS AFTER THE CLOSING..................................................29
</TABLE>


                                    Page ii
<PAGE>   4


<TABLE>
<S>           <C>                                                                                 <C>
SECTION 6 - GENERAL REPRESENTATIONS AND WARRANTIES.................................................33
         6.1      RECIPROCAL REPRESENTATIONS AND WARRANTIES........................................33
                           (a)      CORPORATE ORGANIZATION.........................................33
                           (b)      REQUISITE APPROVALS............................................33
                           (c)      IMPEDIMENTS TO CONSUMMATION OF AGREEMENT.......................34
                           (d)      BANKRUPTCY.....................................................34
         6.2      SELLER'S REPRESENTATIONS & WARRANTIES............................................34
                           (a)      CONTRACTS & PERMITS............................................35
                           (b)      COMPLIANCE WITH APPLICABLE LAWS................................35
                           (c)      PREFERENTIAL PURCHASE RIGHTS AND CONSENTS TO ASSIGNMENT........35
                           (d)      LITIGATION.....................................................35
                           (e)      TAXES..........................................................36
                           (f)      LEASES AND WELLS...............................................36
                           (g)      MARKETING......................................................36
                           (h)      CONTRACT RIGHTS................................................37
                           (i)      OPERATIONS AND OPEN AFES.......................................38
                           (j)      ENVIRONMENTAL MATTERS..........................................38
                           (k)      WORKING INTEREST/NET REVENUE INTEREST..........................39
                           (l)      AFFILIATE CONTRACTS............................................39
                           (m)      BROKER'S FEES..................................................39
                           (n)      NO ENCUMBRANCES................................................40
                           (o)      NO TAX PARTNERSHIP.............................................40
                           (p)      SECTION 754 ELECTION...........................................40
                           (q)      PLUGGING OBLIGATIONS...........................................40
                           (r)      EXCHANGE/REMOVAL OF EQUIPMENT..................................41
                           (s)      MMS AND STATE OF LOUISIANA APPROVAL............................41
                           (t)      REVERSIONARY RIGHTS............................................41
                           (u)      INSPECTION REPORTS.............................................41
                           (v)      PRODUCER, FIELD AND PIPELINE IMBALANCES........................42
                           (w)      PAY-OUT REPORTS................................................42
         6.3      PURCHASER'S REPRESENTATIONS & WARRANTIES.........................................42
                           (a)      RECEIPT OF DATA................................................42
                           (b)      INDEPENDENT EVALUATION.........................................42
                           (c)      NO SECURITIES DISTRIBUTION.....................................43
                           (d)      BROKER'S FEES..................................................43
                           (e)      GOVERNMENTAL BODY APPROVAL.....................................44
                           (f)      TRANSPORTATION AGREEMENTS......................................44
         6.4      RELIANCE          ...............................................................44
                           (a)      BY SELLER......................................................44
                           (b)      BY PURCHASER...................................................44
</TABLE>


                                    Page iii
<PAGE>   5



<TABLE>
<S>           <C>                                                                             <C>
         6.5      SURVIVAL OF REPRESENTATIONS & WARRANTIES.........................................44
SECTION 7 - ACCOUNTING FOR REVENUE & EXPENSES......................................................45
         7.1      ADJUSTMENTS .....................................................................45
                           7.1.1 FINAL ACCOUNTING..................................................45
                           7.1.2 NOTICE TO REMITTERS OF PROCEEDS...................................47
         7.2      ALLOCATION OF TAX LIABILITIES....................................................48
SECTION 8 - PURCHASER'S OBLIGATIONS ...............................................................48
         8.1      PURCHASER'S ASSUMED OBLIGATIONS..................................................48
         8.2      PLUGGING AND ABANDONMENT OF WELLS, REMOVAL OF PLATFORMS & FACILITIES.............49
SECTION 9 - DISCLAIMER OF WARRANTY / INDEMNIFICATION...............................................50
         9.1      SALE ............................................................................50
         9.2      DISCLAIMER REGARDING OIL & GAS INTERESTS.........................................51
         9.3      DISCLAIMER REGARDING INFORMATION.................................................52
         9.4      INDEMNIFICATION .................................................................53
SECTION 10 - ADMINISTRATIVE PROVISIONS.............................................................58
         10.1     EXPENSES OF SALE ................................................................58
         10.2     THIRD PARTY RIGHTS...............................................................58
         10.3     FURTHER ACTIONS .................................................................58
         10.4     NOTICES .........................................................................60
         10.5     PUBLIC ANNOUNCEMENTS.............................................................61
         10.6     TIME LIMITS .....................................................................62
         10.7     COMPLIANCE WITH LAWS & REGULATIONS...............................................62
         10.8     APPLICABLE LAW ..................................................................62
                           10.8.1   DTPA WAIVER....................................................63
         10.9     ARBITRATION .....................................................................64
         10.10    SEVERANCE OF INVALID PROVISIONS..................................................67
         10.11    CONSTRUCTION & INTERPRETATION....................................................67
                           10.11.1  HEADINGS FOR CONVENIENCE.......................................67
                           10.11.2  GENDER & NUMBER................................................68
                           10.11.3  INDEPENDENT REPRESENTATION.....................................68
         10.12    INTEGRATED AGREEMENT.............................................................68
         10.13    BINDING EFFECT ..................................................................69
         10.14    MULTIPLE COUNTERPARTS............................................................69
         10.15    FAIR NOTICE DISCLOSURE STATEMENT.................................................69
         10.16    GAS BALANCING ...................................................................69
</TABLE>


                                    Page iv
<PAGE>   6


                            ASSET PURCHASE AGREEMENT


         THIS ASSET PURCHASE AGREEMENT is dated as of April 29, 1999, (but is
effective as of the Effective Time for accounting purposes) by and between
ORLANDO-SOI PARTNERSHIP ("OSP"), SHELL OIL & GAS INVESTMENT LIMITED PARTNERSHIP
("SOGI"), both Delaware partnerships, SHELL OFFSHORE INC., SHELL DEEPWATER
DEVELOPMENT HOLDINGS INC. ("SDDHI"), MIDSTREAM CAPITAL CORPORATION ("MCC"),
SHELL CONSOLIDATED ENERGY RESOURCES INC. ("SCERI"), SHELL ONSHORE VENTURES INC.
("SOVI"), SHELL FRONTIER OIL & GAS INC. ("SFOGI") AND SOI FINANCE INC. ("SOIFI")
all Delaware corporations, each of the foregoing having a post office address of
P. O. Box 61933, New Orleans, Louisiana 70161, except that OSP and MCC have a
post office address of P. O. Box 4749, Houston, Texas 77210 (collectively herein
referred to as "SELLER"), and APACHE CORPORATION, a Delaware corporation,
("PURCHASER") the address for which is 2000 Post Oak Boulevard, Suite 100,
Houston, Texas 77056-4400. SELLER and PURCHASER are sometimes separately
referred to as a "Party" and are sometimes collectively referred to as
"Parties".

         WHEREAS, subject to the terms and conditions set forth in this
Agreement, PURCHASER desires to purchase from SELLER, and SELLER desires to sell
to PURCHASER, all of SELLER's interests in certain oil and gas properties
located in the Outer Continental Shelf of the Gulf of Mexico and the State of
Louisiana.

         NOW THEREFORE, in consideration of the mutual promises contained
herein, the benefits to be derived by each Party hereunder, and other good and
valuable consideration, PURCHASER and SELLER agree as follows:


                                     Page 1
<PAGE>   7


                       SECTION 1 - DEFINITIONS / EXHIBITS

         The following terms as used in this Agreement shall have the
definitions set forth below:

1.1      ACCOUNTING CLOSING DATE: shall mean that certain date upon which
         PURCHASER assumes responsibility for accounting functions as set forth
         in Section 5.5(a).

1.2      AGREEMENT: shall mean this "Asset Purchase Agreement" together with its
         attached Exhibits and Schedules, all of which are incorporated into
         this Agreement for all purposes and as fully as if set forth in the
         text of this Agreement.

1.3      AFFILIATE:  shall mean

         (a)   any corporation, limited liability company, partnership
               (including a limited partnership), or other entity owned or
               controlled by a Party to this Agreement. Ownership or control by
               a Party is deemed to exist if a Party to this Agreement directly
               or indirectly owns or controls fifty percent (50%) or more of the
               outstanding stock of the corporation having the right to vote for
               directors of the corporation (or fifty percent (50%) or more of
               the interests in the partnership or other entity). The stock (or
               interests in a partnership or other entity) owned or controlled
               by a Party shall include all stock (or other interests) directly
               or indirectly owned or controlled by any other corporation,
               partnership or other entity owned or controlled by a Party to
               this Agreement. Affiliate shall include Equilon Pipeline Company
               LLC and Tejas Holdings, LLC; and


                                     Page 2
<PAGE>   8


         (b)   any "parent" corporation, partnership or other entity that
               directly or indirectly owns or controls fifty percent (50%) or
               more of the outstanding stock (or other interests) having the
               right to vote for directors of a Party to this Agreement, and
               also includes any "sister" corporation, partnership or other
               entity in which the parent corporation directly or indirectly
               owns or controls fifty percent (50%) of the voting stock (or
               other interests) in such sister corporation.

1.4      BUSINESS RECORDS: as defined in Section 2.1.8.

1.5      EFFECTIVE TIME: shall mean 12:00 a.m. local time where the Oil & Gas
         Interests are located on March 1, 1999.

1.6      EXHIBITS: Attached hereto and forming an integral part of this
         Agreement are Exhibits "1" through "8" which are individually described
         as follows:

               Exhibit "1a"   Description of Leases, Rights-of-Way, and other
                              mineral rights
               Exhibit "1b"   List of Wells and Well Status
               Exhibit "1c"   List of Platforms
               Exhibit "2a"   Form of Assignment of Record Title
               Exhibit "2b"   Form of Assignment of Operating Rights
               Exhibit "2c"   Form of Assignment of Overriding Royalty Interest
               Exhibit "2d"   Form of Bill of Sale
               Exhibit "2e"   Form of Assignment of State of Louisiana Leases
               Exhibit "3a"   Form of Seismic License of Proprietary Surveys
               Exhibit "3b"   Form of Seismic License of Reprocessed Data
               Exhibit "3c"   TGS Form of Seismic License


                                     Page 3
<PAGE>   9






               Exhibit "4"    Excluded Property
               Exhibit "5"    Form of Assignment of Pipeline Rights-of-Way
               Exhibit "6"    Form of SOSCO Lease of Platform Space
               Exhibit "7"    Form of Stock Purchase Agreement
               Exhibit "8"    Non-Foreign Affidavits

1.7 SCHEDULE: Attached hereto and forming an integral part of this Agreement are
the following Schedules:

         Schedule 2.1.6     Contract Rights
         Schedule 2.1.7     Proprietary Data
         Schedule 2.3.1     Liability Exclusions
         Schedule 3.5(d)    Purchase Price Allocations for Rights
         Schedule 6.2(b)    Compliance with Applicable Laws
         Schedule 6.2(c)    Preferential Rights and Consents to Assignment
         Schedule 6.2(g)    Marketing
         Schedule 6.2(h)    Status of Contract Rights
         Schedule 6.2(i)    Operations and Open AFEs
         Schedule 6.2(j)    Environmental Matters
         Schedule 6.2(l)    Affiliate Contracts
         Schedule 6.2(n)    Encumbrances
         Schedule 6.2(o)    Tax Partnership
         Schedule 6.2(q)    Plugging Obligations
         Schedule 6.2(r)    Exchange/Removal of Equipment
         Schedule 6.2(s)    MMS and State of Louisiana Approval
         Schedule 6.2(v)    Wellhead Balancing
         Schedule 6.2(w)    Pay-out Reports
         Schedule 6.3(e)    Governmental Body Approval

1.8      CLOSING: shall mean the date of (i) the execution and delivery of the
         operative conveyances and other closing documents evidencing the
         consummation of this transaction, and (ii) the payment of the Purchase
         Price to SELLER, and any other amounts to be paid at Closing pursuant
         to the terms of this Agreement but excluding any amounts escrowed in
         accordance with Section 3.5.


                                     Page 4
<PAGE>   10


1.9      CONTRACT RIGHTS: as described in Section 2.1.6.

1.10     EASEMENTS: as described in Section 2.1.5.

1.11     GOVERNMENTAL BODY: means any federal, state, county, municipal, or
         other federal, state or local governmental authority or judicial or
         regulatory agency, board, body, department, bureau, commission,
         instrumentality, or court having jurisdiction over any of the Oil & Gas
         Interests or any Party to this transaction, or any of the transactions
         or matters contemplated by this Agreement.

1.12     KNOWN/KNOWLEDGE: Whenever a statement regarding the existence (or
         absence) of any fact in this Agreement is qualified by a phrase such as
         "to such Party's Knowledge" or "Known to such Party," the Parties
         intend that the only information to be attributed to such Party is
         information actually known to (a) the person in the case of an
         individual or (b) in the case of a corporation (or other business
         entity), and of its affiliates and subsidiaries, a current officer or
         employee who devotes substantial attention to matters of such nature
         during the ordinary course of his employment. Unless otherwise
         specifically provided in this Agreement, no Party is represented or
         obligated to have undertaken a separate investigation in connection
         with the transaction contemplated in this Agreement to determine the
         existence (or absence) of any statement or representation qualified by
         a phrase such as "to such Party's Knowledge or "Known to such Party".

1.13     LEASE: shall mean the oil and gas lease(s) (or portion(s) thereof)
         identified in Exhibit "1a" attached hereto and the lands affected by
         each such Lease.


                                     Page 5
<PAGE>   11


1.14     MMS: shall mean the U.S. Department of the Interior, Minerals
         Management Service, or any successor agency, and the records maintained
         at the New Orleans, La. Regional Office of that agency, or any
         successor agency.

1.15     NET REVENUE INTEREST: shall mean the aggregate fractional or percentage
         ownership of SELLER, as of the Effective Time, of the right to receive
         hydrocarbon production (either in-kind or the share of proceeds from
         sales of hydrocarbon production) from the applicable Leases (excluding
         non-consent operations), after the deduction of all burdens upon a
         Lease such as lessor's royalty on production (other than taxes) as that
         share is set out in Exhibit "1a," subject to any exclusions noted in
         Exhibit "1a."

1.16     OIL & GAS INTERESTS: shall mean all of SELLER's interest in those
         certain Lease(s) and other oil and gas leasehold estates or interests,
         as such interests are set forth in Exhibit "1a", together with SELLER's
         ownership interest in the well(s), platforms, facilities, gathering
         systems, pipelines and pipeline laterals located on the Leases, and the
         contract rights, associated rights, easements, proprietary data, and
         business records, located on or associated with the Leases, all as
         described in Section 2.1 below.

1.17     OPERATOR: shall mean the person, designated or approved as Operator of
         the Oil & Gas Interests under the terms of the applicable joint
         operating agreement, if any, or by the appropriate Governmental Body.

1.18     PLATFORMS & FACILITIES: as defined in Section 2.1.4.

1.19     PROPRIETARY DATA: as defined in Section 2.1.7.


                                     Page 6
<PAGE>   12


1.20     TERMINATION DATE: shall mean that date specified in Section 5.5(a).

1.21     PARTY:  shall mean any of the named SELLER and PURCHASER.

1.22     WORKING INTEREST: shall mean the aggregate fractional or percentage
         record title interest and/or operating rights of SELLER in and to each
         Lease as of the Effective Time by virtue of which SELLER has the right
         to conduct the operations contemplated by a Lease and this Agreement.

1.23     STOCK PURCHASE AGREEMENT: shall mean that certain Stock Purchase
         Agreement dated the date hereof, between PURCHASER and SELLER under the
         terms of which PURCHASER will issue to SOI at Closing one million
         (1,000,000) shares of common stock, par value $1.25 per share, of
         PURCHASER.

1.24     HSR ACT:  shall mean the Hart Scott Rodino Antitrust Improvement Act of
         1976, as amended.


                          SECTION 2 - PURCHASE AND SALE


2.1      PURCHASE AND SALE OF ASSETS: SELLER agrees to sell and PURCHASER agrees
         to purchase, for the consideration recited and upon the terms and
         conditions contained in this Agreement, the Oil & Gas Interests. Except
         for the Excluded Assets listed in Section 2.2 below, upon Closing,
         SELLER shall sell, assign and deliver to PURCHASER the Oil & Gas
         Interests, further described as follows:

         2.1.1      LEASES: All of SELLER's record title interest (or operating
                    rights), overriding royalty, or other mineral interests
                    comprising the Working


                                     Page 7
<PAGE>   13


                    Interest and Net Revenue Interest in each Lease, or portion
                    thereof, and other interests in oil and gas, as described in
                    Exhibit "1a" and all rights, privileges and obligations
                    appurtenant to each Lease; and


         2.1.2      ASSOCIATED INTERESTS: All of SELLER's rights in any unit in
                    which a Lease is included, to the extent that these rights
                    arise from and are associated with a Lease, including
                    without limitation, all rights derived from any pooling
                    order, operating agreement, communitization or other
                    agreement or from any declaration or order of any
                    Governmental Body; and


         2.1.3      WELLS: All of SELLER's right, title and interest in all oil,
                    gas or condensate wells and wellbore(s) (whether producing,
                    not producing, plugged, unplugged or permanently or
                    temporarily abandoned), water source, water injection and
                    other injection and disposal wells and systems located on a
                    Lease (or lands pooled with a Lease) ("WELLS"); to SELLER's
                    Knowledge, Exhibit "1b" lists all Wells and the status of
                    each as of the indicated dates, which list is provided to
                    PURCHASER strictly as an accommodation, for informational
                    purposes, and without any representation or warranty of
                    completeness or accuracy or any other sort of representation
                    or warranty; and

         2.1.4      PLATFORMS & FACILITIES: All of SELLER's right, title and
                    interest in all platforms, facilities, pipelines, pipeline
                    laterals, gathering systems, equipment, fixtures, inventory,
                    spare parts, tools and other personal property located on,
                    or charged to and to be located on, a Lease or lands
                    unitized therewith; to SELLER's Knowledge, Exhibit "1c"
                    lists all platforms located on or charged to a Lease or
                    lands unitized therewith, which list is provided to
                    PURCHASER strictly as an accommodation, for informational


                                     Page 8
<PAGE>   14


                    purposes, without any representation or warranty of
                    completeness or accuracy, or any other sort of
                    representation or warranty; and

         2.1.5      EASEMENTS: All of SELLER's right, title and interest in all
                    easements, rights of way, licenses, permits, servitudes,
                    surface leases and similar interests applicable or used in
                    operating a Lease, Wells, Platforms & Facilities and
                    pipelines described above, to the extent assignable or
                    transferable; to SELLER's Knowledge, Exhibit "1a" lists all
                    Easements (excluding permits and licenses) applicable to or
                    used in operating a Lease, Wells, Platforms & Facilities or
                    pipelines described above, to the extent assignable or
                    transferrable; and

         2.1.6      CONTRACT RIGHTS: All of SELLER's right, title and interest
                    in the contracts and contractual rights, obligations and
                    interests (to the extent assignable or transferable) insofar
                    as same relate to, or are associated with, any Oil & Gas
                    Interest, and are identified on Schedule 2.1.6 hereto; and

         2.1.7      PROPRIETARY DATA: To the extent assignable or transferable,
                    (i) a copy of all of SELLER's geophysical and geological
                    data owned by SELLER as of Closing relating to a Lease,
                    including shallow hazard surveys and geological maps, but
                    excluding any data that in SELLER's sole and unfettered
                    discretion might result in the disclosure of proprietary
                    seismic methodologies, (ii) as to seismic data, a
                    non-exclusive license to the seismic data, in the form set
                    forth as Exhibits A3a", "3b", or "3c", as applicable (the
                    surveys being more particularly described on Schedule
                    2.1.7); (iii) a copy of all logs (including those in digital
                    format) covering the Oil & Gas Interests, and (iv) a copy of
                    Bob Brown's data base to the extent applicable to the Oil &
                    Gas Interests; and


                                     Page 9
<PAGE>   15


         2.1.8      BUSINESS RECORDS: All other tangibles, miscellaneous
                    interests or other assets on or used in connection with a
                    Lease, including without limitation, originals (or
                    photocopies if in SELLER's discretion originals must be
                    retained for a Governmental Body audit, reporting or related
                    purposes) of all Lease files, files with Governmental
                    Bodies, land files, Well files, engineering files,
                    production records, gas and/or oil imbalance files, Well
                    pay-out files, Lease operating statements, division order
                    files, abstracts, title opinions and contract files insofar
                    as they directly relate to a Lease or lands unitized
                    therewith (but excluding any internal valuations, price
                    forecasts or interpretive data or interpretive
                    documentation).

2.2      EXCLUDED ASSETS: The assets to be assigned and conveyed under this
         Agreement do not include (collectively, the "Excluded Assets"):

         2.2.1      LICENSED DATA: Seismic, geophysical, or geological data
                    owned by or licensed from third parties or subject to a
                    confidentiality obligation in favor of a third party or any
                    of SELLER's intellectual property, software, patents,
                    trademarks, logos or service marks used in exploring,
                    developing or operating a Lease; and

         2.2.2      TRADE ACCOUNTS AND CAUSES OF ACTION: Accounts and
                    receivables or refunds, income or revenue, deposits,
                    insurance or condemnation proceeds or awards, rights with
                    respect to operations or claims and causes of action in
                    favor of SELLER (excluding field and producer imbalances)
                    which are attributable to SELLER's ownership of the Oil &
                    Gas Interests as of the Effective Time, particularly such
                    claims regarding the accounting for any overriding royalty
                    interest(s) owned by SELLER or its Affiliates; and


                                    Page 10
<PAGE>   16



         2.2.3      AFFILIATE AND THIRD PARTY ASSETS: Any leased equipment for
                    which PURCHASER does not specifically assume the lease or
                    third party equipment and property that may be located on a
                    Lease, and pipelines, fixtures, equipment, and processing
                    rights which belong to third parties such as Affiliates,
                    lessors, purchasers, and transporters of hydrocarbons; and

         2.2.4      OTHER EXCLUDED ASSETS: Those assets listed on Exhibit 4
                    hereof, entitled "Excluded Property".

2.3      ASSETS SUBJECT TO EXISTING AGREEMENTS: Subject to Section 6.2 (k),
         PURCHASER and SELLER agree that the sale of the Oil & Gas Interests
         will be made subject to (and PURCHASER accepts the Oil & Gas Interests
         subject to) any and all reservations, exceptions, and limitations which
         are included in the files made available to PURCHASER for review, or
         are referred to therein, and all contracts, assignments, subleases,
         farmout agreements, joint operating agreements, letter agreements,
         pooling or unitization agreements, easements, rights-of-way and all
         other agreements or instruments (i) which are of record with the MMS or
         in the appropriate parish/county records or the Governmental Bodies of
         the State of Louisiana, or (ii) which are listed on Schedule 2.1.6. In
         addition, as a part of the consideration hereunder, PURCHASER, as set
         forth in this Agreement, shall assume, pay for, and perform SELLER's
         duties, liabilities and obligations as lessee of each Lease and all
         duties imposed by governmental laws and regulations. PURCHASER further
         agrees to expressly assume SELLER's obligations and liabilities under
         the contracts described in this Section 2.3 insofar as such obligations
         or liabilities relate to the Oil & Gas Interests after the Effective
         Time, and to execute any documents necessary to effectuate such
         assumption by PURCHASER.


                                    Page 11
<PAGE>   17


         2.3.1      EXCLUSIONS: PURCHASER shall not assume or be responsible for
                    and SELLER retains responsibility for (i) contractual
                    performance by SELLER, due and owing prior to or relating to
                    time periods prior to or as of the Effective Time, (ii)
                    underpayments or failure to pay royalties, overriding
                    royalties, and other lease burdens due by SELLER on or under
                    the Leases prior to the Effective Time, (iii) property
                    damage sustained by third parties, or personal injury or
                    death, occurring prior to the Closing, (iv) any regulatory
                    fines or penalties attributable to the ownership or
                    operation of the Leases prior to the Closing, (v) any
                    accounting or payments due to SELLER's Affiliates,
                    subsidiaries or third parties for hydrocarbon production (or
                    the proceeds from the sale thereof) or processing or
                    transportation attributable to the period of time prior to
                    the Effective Time, and (vi) any existing litigation or
                    demands made as of the Closing arising out of the ownership
                    and operation of the Oil & Gas Interests prior to the
                    Effective Time, including without limitation, those matters
                    identified on Schedule 2.3.1.

2.4      PURCHASE PRICE: PURCHASER agrees that the total purchase price for the
         Oil & Gas Interests shall be (i) Seven Hundred Fifteen Million and
         no/hundredths ($715,000,000) Dollars payable at Closing and subject to
         adjustments as provided for in Section 7 hereof, and (ii) one million
         (1,000,000) shares of common stock, $1.25 par value, of PURCHASER to be
         issued to SOI at Closing in accordance with the terms of the Stock
         Purchase Agreement (collectively, the "PURCHASE PRICE"). The payment of
         the cash component of the Purchase Price shall be made by electronic
         transfer of immediately available funds (EFT) to the credit of SOI's
         bank account at Chase New York, Account Number 322018773 (ABA Number
         021000021).


                                    Page 12
<PAGE>   18



         At and after Closing, the cash component of the Purchase Price shall be
         subject to adjustment pursuant to Section 7; however, there shall not
         be any adjustment to the stock component of the Purchase Price.

2.5      ADDITIONAL CONSIDERATION:

         2.5.1      As additional consideration, PURCHASER shall assume all of
                    SELLER's responsibility and liability for the proper
                    plugging and abandonment of all Wells and wellbores, and the
                    removal of any Platforms & Facilities and pipelines located
                    on each Lease.

         2.5.2      In addition, except as provided in Section 2.5.3, PURCHASER
                    assumes responsibility and liability for claims arising out
                    of the following occurrences, events and activities on or
                    related to the Oil & Gas Interests ("Environmental
                    Obligations"), regardless of whether resulting from any acts
                    or omissions of SELLER prior to the Closing or the condition
                    of the Oil & Gas Interests when acquired:

                    (a)   Environmental pollution or contamination, including
                          pollution or contamination of the soil, sea,
                          groundwater or air by hydrocarbons, brine, NORM or
                          otherwise;

                    (b)   Underground injection activities and waste disposal
                          onsite;

                    (c)   Clean-up responses, and the cost of remediation,
                          control, assessment or compliance with respect to
                          surface, sea floor, and subsurface pollution;


                                    Page 13
<PAGE>   19


                    (d)   Disposal on the Oil & Gas Interests of any hazardous
                          substances, wastes, materials, and products generated
                          by or used in connection with the ownership or
                          operation of the Oil & Gas Interests.


         2.5.3      EXCLUSIONS: PURCHASER's Environmental Obligations do not
                    include and SELLER hereby retains responsibility for the
                    following:

                    (a)   Any civil or criminal fines or penalties that may be
                          levied against SELLER by any court or regulatory
                          authority for any violation of any laws, rules or
                          regulations in connection with the ownership or
                          operation of the Oil & Gas Interests before the
                          Closing;

                    (b)   Transportation and disposal offsite from the Oil & Gas
                          Interests before Closing of any hazardous substances,
                          wastes, NORM, materials, and products generated by or
                          used in connection with the ownership or operation of
                          the Oil & Gas Interests before the Closing; and

                    (c)   Claims against PURCHASER by third parties, including
                          Governmental Bodies, resulting from the Environmental
                          Obligations, which arose, accrued, and are
                          attributable to the ownership or operation of the Oil
                          & Gas Interests prior to the Closing, and are asserted
                          within eighteen (18) months of the Effective Time,
                          based upon laws enacted as of the Effective Time. It
                          is agreed and understood, moreover, that this
                          exclusion and SELLER's indemnity


                                    Page 14
<PAGE>   20


                          obligations with respect to the same under this
                          Agreement shall be limited only to Claims against
                          PURCHASER by third parties, including Governmental
                          Bodies.

2.6      TITLE AND RISK OF LOSS: SELLER shall deliver possession of the Oil &
         Gas Interests to PURCHASER at the Closing. Title to and risk of loss
         with respect to the Oil & Gas Interests (and all associated property)
         shall pass to PURCHASER as of the Closing.

2.7      SPECIFIC PERFORMANCE:  Each Party shall have the right of specific
         performance.

2.8      INSURANCE: SELLER and PURCHASER agree that all liability insurance
         obtained by PURCHASER during its term of ownership of the Oil & Gas
         Interests to cover environmental damages or for third party property
         damage, personal injury or death shall name SELLER as additional
         insured to the extent of PURCHASER's liability and indemnification
         obligations assumed hereunder, and shall contain a waiver of
         subrogation against SELLER, to the extent such may be obtained without
         PURCHASER incurring significant additional expense.


                            SECTION 3 - TITLE/GENERAL


3.1      TITLE MATTERS: SELLER WILL CONVEY THE OIL & GAS INTERESTS TO PURCHASER
         WITHOUT WARRANTY OF TITLE, EXPRESS, STATUTORY OR IMPLIED, except that
         SELLER will specially warrant and agree to defend title to the Oil &
         Gas Interests conveyed against any claims and demands of all persons
         claiming title to the Oil & Gas Interests by, through and under SELLER
         or any Affiliate or subsidiary of SELLER, but not otherwise. PURCHASER
         shall have the right of full substitution and subrogation in and to any
         and all rights and actions of


                                    Page 15
<PAGE>   21


         warranty which SELLER or SELLER's Affiliates or subsidiaries may have
         against any and all preceding owners or vendors of the Oil & Gas
         Interests.

3.2      PHYSICAL CONDITION OF THE ASSETS: PURCHASER acknowledges that the Oil &
         Gas Interests have been used by SELLER for oil and gas drilling and
         production operations and related oilfield operations and physical
         changes in the Oil & Gas Interests (or adjacent lands) may have
         occurred as a result of such uses. In this regard, the Oil & Gas
         Interests may also contain unplugged wells, wellbores or buried
         pipelines or other equipment, whether or not of a similar nature, the
         locations of which may not now be Known by SELLER or be readily
         apparent by a physical inspection of the property. PURCHASER and SELLER
         understand that neither SELLER nor PURCHASER has the requisite
         information with which to determine the exact condition of the Oil &
         Gas Interests nor the effect any such use has had on the physical
         condition of the Oil & Gas Interests.

3.3      NORM: PURCHASER acknowledges that some oilfield production equipment
         comprising the Oil & Gas Interests may contain asbestos and/or
         naturally occurring radioactive material ("NORM"). In this regard,
         PURCHASER specifically acknowledges that NORM may affix or attach
         itself to the inside of wellbores, materials and equipment as scale or
         in other forms, and that wells, materials and equipment comprising the
         Oil & Gas Interests and being located on a Lease may contain NORM and
         that NORM containing materials may have been disposed of on a Lease.
         PURCHASER expressly understands that special procedures may be required
         for the removal and disposal of asbestos and NORM from the Oil & Gas
         Interests if and where they may be found, and PURCHASER assumes
         SELLER's liability for or in connection with the assessment,
         remediation, removal, transportation or disposal of any such materials
         present on the Oil & Gas Interests


                                    Page 16
<PAGE>   22


         at or after the Closing in accordance with all requirements of any
         Governmental Body.

3.4      AVAILABILITY OF DATA: PURCHASER acknowledges that historical file
         information of SELLER regarding hydrocarbon production and produced
         water that may have been spilled or disposed of on-site and the
         locations thereof, together with all underground injection and solid
         waste disposal sites have been made available to PURCHASER for
         inspection prior to the Closing except for interpretive or predictive
         reservoir data or information which SELLER considers confidential or
         proprietary. SELLER has not caused any environmental assessment of the
         Oil & Gas Interests to be performed or (except as noted above)
         attempted to gather information necessary to determine the exact nature
         of the environmental condition of the Oil & Gas Interests for the
         purposes of this sale.

3.5      PREFERENTIAL RIGHTS AND CONSENTS:

         (a)      Prior to the date of the execution of this Agreement, SELLER
                  has consulted with PURCHASER on the forms of notice and
                  request for waivers to be sent to all holders of preferential
                  purchase rights ("RIGHTS") in the Leases (and for purposes of
                  this Section 3.5, the term "Leases" shall include any
                  rights-of-way subject to a preferential right). As soon as
                  practicable after the date hereof, SELLER shall transmit, or
                  cause PURCHASER to transmit, to the respective holders of the
                  Rights the notices and request for waivers. The Parties shall
                  keep each other informed on a current basis as receipt of
                  responses from the holders of the Rights are received or
                  applicable exercise periods expired without exercise or
                  response from the holders.


                                    Page 17
<PAGE>   23


         (b)      To the extent that any Rights are exercised by any third party
                  entitled to exercise such Rights, then the Leases subject to
                  such Rights shall not be sold to PURCHASER and shall be
                  excluded from the Agreement. Subject to the terms of the
                  Rights, if any third party initially elects to exercise a
                  Right, but subsequently refuses or elects not to consummate
                  the purchase under such Right and such refusal occurs within
                  180 days following Closing, PURCHASER shall purchase such
                  interests covered by the Right for its allocated value as of
                  the Effective Time and the closing of such transaction shall
                  take place on a date mutually acceptable to PURCHASER and
                  SELLER, but not more than 30 days following such failure or
                  refusal.

         (c)      SELLER shall not object to PURCHASER discussing with the
                  holder of any Right the possible exercise, waiver or
                  expiration of such Rights, without any liability on the part
                  of SELLER.

         (d)      At Closing, SELLER (i) shall deposit into an escrow to be
                  created, multiple originals of documents of assignment,
                  transfer and conveyance (the "RIGHT ASSIGNMENTS") relating to
                  the Leases for which the time for the exercise of the Right
                  has not expired or been waived and (ii) PURCHASER shall
                  deposit into escrow, the portion of the Purchase Price
                  allocated to the applicable Leases subject to the unexpired
                  Right, as set forth on Schedule 3.5(d). Promptly after the
                  expiration or waiver of any Right, SELLER and PURCHASER, by
                  joint notice, shall instruct the escrow agent (i) to deliver
                  the applicable Right Assignment to PURCHASER, and (ii) to
                  release to SELLER with interest, if any, the allocable portion
                  of the Purchase Price attributable to the applicable Lease
                  subject to the expired or waived Right.


                                    Page 18
<PAGE>   24


         (e)      If a Right is exercised after Closing, PURCHASER and SELLER
                  agree as follows: (1) the escrow agent, upon receipt of the
                  joint instructions of PURCHASER and SELLER, shall destroy the
                  applicable Right Assignment; (2) SELLER shall execute and
                  deliver to the holder of the applicable Right an appropriate
                  instrument of assignment, transfer and conveyance in
                  accordance with the applicable Contract Right, and (3) the
                  escrow agent shall release to PURCHASER, with interest, if
                  any, the allocable portion of the Purchase Price attributable
                  to the applicable Lease subject to the exercised Right.

         (f)      SELLER and PURCHASER agree to cooperate in the attempt to
                  obtain any consents required to be obtained from third parties
                  under any Contract Right as a condition to the assignment of
                  any of the Leases from SELLER to PURCHASER. In the event any
                  such third party elects not to grant such requested consent,
                  the Parties shall meet to determine what action should be
                  jointly taken.

                      SECTION 4 - COVENANTS AND AGREEMENTS

4.1      COVENANTS AND AGREEMENTS OF SELLER: SELLER represents, covenants and
         agrees with PURCHASER as follows:

         (a)      During the period from the Effective Time of this Agreement to
                  the Closing, SELLER agrees, unless specifically waived by
                  PURCHASER in writing, to:

                  (1)      operate the Oil & Gas Interests, to the extent SELLER
                           is the Operator thereof, in substantially the same
                           manner as heretofore operated; and


                                    Page 19
<PAGE>   25


                           maintain books of account and records with regard to
                           the Oil & Gas Interests in accordance with SELLER's
                           past practices;

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

                  (3)      not cancel or waive any debt, claim or right of
                           material value relating to the Oil & Gas Interests of
                           which PURCHASER has not requested or been advised
                           prior to Closing.

4.2      EMPLOYEE MATTERS: PURCHASER shall have the right, upon SELLER's written
         approval, to solicit the employees of SELLER who are specified on
         Schedule B of that certain letter from PURCHASER to SELLER dated April
         5, 1999, and any other employee of SELLER (that SELLER approves in
         writing), and shall have the right, at PURCHASER's election, to offer
         employment to and hire any such employees. If PURCHASER hires any such
         employee, the terms of employment shall be at PURCHASER's discretion,
         provided, however, that PURCHASER shall provide such employees the same
         benefits that are provided to other current employees of PURCHASER of
         comparable seniority, experience/qualifications and job description.

4.3      REGULATION S-X FINANCIAL DATA: SELLER shall provide PURCHASER financial
         data for the calendar years 1996, 1997 and 1998, and any portion of
         1999 prior to Closing. The financial data provided by SELLER shall
         establish the direct lease operating costs with respect to each of the
         Oil & Gas Interests and the gross revenues from such Oil & Gas
         Interests and other such information as may be required by Rule 3.05 of
         Regulation S-X of the United States Securities and Exchange Commission.
         The cost incurred by SELLER in providing the financial


                                    Page 20
<PAGE>   26

         data to PURCHASER shall be borne solely by PURCHASER and shall be
         independent of the amount set forth in Section 5.5 (b). The foregoing
         financial data to be provided by SELLER shall be without representation
         or warranty of any kind and SELLER and PURCHASER agree that SELLER
         assumes no liability with regard to any financial data so provided.

4.4      HSR ACT: PURCHASER and SELLER covenant and agree with each other that
         each will file, or cause to be filed on its behalf, all necessary
         filings and notifications under the HSR Act.

4.5      GREEN CANYON 89 PRODUCTION PROCESSING: PURCHASER and SELLER understand
         and agree that SELLER's production from Leases covering Green Canyon
         Blocks 45 and 89 (the "Cinnamon Block") is currently being processed at
         the facilities located on the Garden Banks Block 128 "A" platform (the
         "Enchilada Facilities") pursuant to that certain letter agreement dated
         November 20, 1998 and the production handling agreement attached
         thereto (collectively the "Enchilada Agreement"), between SOI, as the
         GB128 "A" operator, SOI, as the Cinnamon Block operator, and the other
         working interest owner in the Cinnamon Block. PURCHASER and SELLER
         further understand and agree that after Closing, PURCHASER's production
         from the Cinnamon Block will continue to be processed at the Enchilada
         Facilities under the Enchilada Agreement.

                In order to provide PURCHASER with further assurances with
         respect to PURCHASER's ability to continue to process its production
         from the Cinnamon Block, SELLER hereby agrees as follows:


                                    Page 21
<PAGE>   27


                (a) SELLER hereby represents, warrants and covenants to
         PURCHASER that (i) the Enchilada Agreement is a legally binding and
         enforceable agreement for the processing of production from the
         Cinnamon Block, and SELLER agrees to continue to process PURCHASER's
         production under the same terms and conditions as set forth in the
         Enchilada Agreement, notwithstanding any action brought by or any
         election made by a party other than PURCHASER or SELLER to terminate or
         invalidate said agreement, and (ii) SELLER hereby agrees not to take
         any action to terminate or amend the Enchilada Agreement without the
         prior written consent or joinder of PURCHASER; provided, however, such
         shall not prevent SELLER from exercising its remedies in the event of a
         default by PURCHASER of the terms and conditions set forth in the
         Enchilada Agreement.

                (b) SELLER hereby further agrees to defend, indemnify and hold
         PURCHASER harmless against any and all claims, liabilities, losses,
         causes of actions, damages, costs and expenses arising out of any
         action brought by any Enchilada Facilities owner or other Cinnamon
         Block owner against PURCHASER and/or SELLER which may result in the
         interruption, discontinuance, or rate increase of production handling
         services at the Enchilada Facilities by reason of any breach of Section
         4.5(a) above. Notwithstanding the foregoing or any other terms and
         conditions contained in this Agreement, SELLER's aggregate liability
         under this Section 4.5(b) shall not exceed the sum of five million
         seven hundred thousand dollars ($5,700,000.00). SELLER's liability
         under this Section 4.5(b) shall not be subject to the two million
         dollar ($2,000,000.00) deductible provided for in Section 9.4(c)(iii).
         Nothing herein shall be deemed a representation or warranty as to the
         existence of transportation arrangements from the Cinnamon Block.


                                    Page 22
<PAGE>   28


                               SECTION 5 - CLOSING


5.1      CONDITIONS PRECEDENT: The Parties' obligations to proceed to Closing is
         subject to the satisfaction of all of the following conditions:

         5.1.1.   HSR APPROVAL: All necessary approvals or consents under the
                  Hart Scott Rodino Antitrust Improvement Act of 1976, as
                  amended, will have been obtained.

         5.1.2.   MAIN PASS 290 FIELD AGREEMENT: On or before May 12, 1999, the
                  Parties will have executed a formal written Main Pass 290
                  Field agreement with regard to the operation of Main Pass 290
                  Field in form and content acceptable to both Parties.

         5.1.3.   PURCHASER'S CERTIFICATION: On or before May 12, 1999,
                  PURCHASER will have certified in writing to SELLER that the
                  Exhibits and Schedules identified in the Agreement are
                  acceptable in form and content, which will not be unreasonably
                  withheld.

         5.1.4.   FAILURE OF CONDITION: The Parties hereby agree to use their
                  best efforts to satisfy or cause to be satisfied each of the
                  foregoing conditions contemplated by Sections 5.1.1 through
                  5.1.3 as soon as practicable. In the event that the Parties
                  are still working in good faith on May 12 to satisfy one or
                  more of the foregoing conditions, the Parties agree to extend,
                  up to seven (7) business days, the period for the satisfaction
                  of such condition(s).


                                    Page 23
<PAGE>   29


                  Subject to the foregoing, unless mutually agreed otherwise by
                  the Parties, this Agreement shall be null and void, and be of
                  no further force and effect, upon the failure of one or more
                  of the conditions in Section 5.1 to be timely satisfied, and
                  following such failure neither Party shall have any liability
                  whatsoever to the other.

         5.1.5.   INTEREST ON PURCHASE PRICE: Absent the fault of SELLER,
                  interest shall accrue on the cash component of the Purchase
                  Price from the later of the day following (i) the date of the
                  satisfaction of the condition set forth in Section 5.1.1 and
                  (ii) May 12, 1999, until the date of Closing, at the published
                  or quoted prime or base rate of Citibank N.A., plus one
                  percent (1%), such interest to constitute part of the adjusted
                  Purchase Price as provided for in Section 7.

5.2      CLOSING: Subject to Section 3.5, the Closing shall take place promptly
         upon satisfaction of the conditions set forth in Section 5.1 and shall
         be held at the offices of SELLER at 701 Poydras Street, New Orleans,
         Louisiana. The following shall take place at Closing:

         (a)        SELLER and PURCHASER shall execute and deliver assignments
                    and bills of sale on the forms which are attached as
                    Exhibits hereto, conveying all of SELLER's interest in the
                    Oil & Gas Interests to PURCHASER, or to a designated
                    subsidiary of PURCHASER with respect to certain Easements
                    and the pipelines associated therewith.


                                    Page 24
<PAGE>   30







         (b)        PURCHASER shall pay to SOI, as agent for SELLER, by wire
                    transfer an amount equal to the cash component of the
                    Purchase Price as adjusted in accordance with the terms
                    hereof and reduced by the amount placed into escrow in
                    accordance with Section 3.5.


         (c)        PURCHASER shall issue to SOI one million (1,000,000) shares
                    of common stock, $1.25 par value, of PURCHASER in accordance
                    with the Stock Purchase Agreement.


         (d)        PURCHASER and SELLER shall execute and deliver the remaining
                    documents contemplated by the transaction described herein
                    in the Stock Purchase Agreement and any other agreements
                    relative hereto deemed necessary or appropriate by the
                    Parties.


         The Parties shall execute other appropriate instruments necessary to
         effect or support the transaction contemplated in this Agreement,
         including without limitation, any ratification or joinder documents
         prepared by SELLER consistent with the terms of this Agreement required
         to transfer any Contract Rights and any lease assignment forms, and
         Designations of Operator or other forms required by any Governmental
         Body to transfer operatorship, where applicable, of the Oil & Gas
         Interests to PURCHASER.

         Upon PURCHASER's completion of its Closing obligations, SELLER shall
         deliver to PURCHASER, exclusive possession of the Oil & Gas Interests
         as of the Closing. Notwithstanding any other provision of this
         Agreement, the failure of PURCHASER


                                    Page 25
<PAGE>   31


         to deliver all of the Purchase Price, as adjusted as contemplated
         above, at Closing shall entitle SELLER to withhold all conveyancing
         documents until such time as it has received the full consideration for
         the conveyance. This right shall be in addition to all other rights and
         remedies that SELLER may have under this Agreement or at law or in
         equity.


         No agreement to be executed and delivered at the Closing, or action to
         be taken at the Closing, shall be effective until all such agreements
         have been executed and delivered or actions have been taken, and all
         such agreements and actions shall be deemed to be effective
         concurrently.


 5.3     POST CLOSING OBLIGATIONS: Upon condition that the Closing shall have
         occurred, SELLER and PURCHASER agree to perform the following
         "Post-Closing Obligations":


         5.3.1      RECORDING & FILING: Within ninety (90) days of Closing,
                    PURCHASER shall (i) file or record the conveyancing
                    documents in the appropriate governmental records and (ii)
                    file for approval with the applicable Governmental Bodies
                    all state and federal transfer and assignment documents for
                    the Oil & Gas Interests. PURCHASER shall provide a copy of
                    same, including recording date, to the SELLER.

         5.3.2      CHANGE OF OPERATOR: Where SELLER is the designated Operator
                    of a Lease, PURCHASER shall promptly file all appropriate
                    forms, declarations or bonds with Governmental Bodies
                    relative to PURCHASER's assumption


                                    Page 26
<PAGE>   32


                    of operations from SELLER. PURCHASER, with SELLER's
                    assistance, shall also take all actions routinely taken to
                    qualify as a successor Operator to SELLER under any
                    applicable joint operating agreement (subject to the terms
                    of that operating agreement).

         5.3.3      NOTICES TO THIRD PARTIES: SELLER and PURCHASER shall notify
                    all lessors, royalty owners, operators, non-operators,
                    purchasers of production and Governmental Bodies that
                    PURCHASER has purchased the Oil & Gas Interests and has
                    assumed liability for their continued operation from and
                    after the Closing. PURCHASER and SELLER shall execute all
                    transfer orders/division orders or letters in lieu of
                    transfer orders necessary to transfer payment of the
                    proceeds from the sale of production from the Oil & Gas
                    Interests as of the Effective Time to PURCHASER.

         5.3.4      DELIVERY OF BUSINESS RECORDS: Within seven (7) days after
                    Closing, SELLER shall commence to deliver to PURCHASER the
                    Business Records specified in this Agreement (subject to the
                    limitations contained in this Agreement). SELLER shall
                    deliver such Business Records on a mutually agreed priority
                    basis and shall complete delivery of all such records within
                    sixty (60) days hereof. If SELLER retains any original
                    Business Records, PURCHASER shall have the right to review
                    (and copy at PURCHASER's expense) such original records
                    during SELLER's normal business hours. PURCHASER shall
                    retain any original records delivered, and SELLER shall
                    retain any such original records not delivered to PURCHASER
                    for a period of seven (7) years from the Effective Time.
                    SELLER reserves the right to access (and copy at SELLER's
                    expense) all original records


                                    Page 27
<PAGE>   33


                    delivered for a period of seven (7) years from the Effective
                    Time (and PURCHASER agrees to grant SELLER access to the
                    records during PURCHASER's normal business hours). In the
                    event that SELLER or PURCHASER wishes to destroy any
                    original books or records in its possession or in the
                    possession of any of its Affiliates prior to such date, such
                    party shall give not less than sixty (60) days notice to the
                    other party and such other party shall have the right, at
                    its own expense, during reasonable business hours, to remove
                    such books and records and to keep possession of same. After
                    the seventh anniversary of the Effective Time, each party
                    will retain (and may destroy) such books and records in
                    accordance with such party's customary record retention
                    practices. If PURCHASER transfers any portion of Oil & Gas
                    Interests, PURCHASER shall advise its assignee that this
                    records retention obligation shall continue as its
                    assignee's obligation.

         5.3.5      USE OF NAME: On or before ninety (90) days after Closing,
                    PURCHASER will remove, or cause to be removed, from the
                    Platforms & Facilities pertaining to the Oil & Gas
                    Interests, the name, logo and service mark of SELLER and all
                    variations and derivations thereof, and will not thereafter
                    make use thereof.

5.4      GOVERNMENTAL APPROVALS: PURCHASER and SELLER shall execute and file all
         forms (and PURCHASER shall perform all acts) required by the MMS and/or
         the State of Louisiana (and other appropriate Governmental Bodies) to
         transfer ownership and operatorship of the Oil & Gas Interests from
         SELLER to PURCHASER, as applicable, effective as of the Effective Time,
         subject to the terms and provisions of applicable joint operating
         agreements. The conveyances (along


                                    Page 28
<PAGE>   34


         with any change in operatorship) involved in this transaction are
         subject to approval by the MMS and/or the State of Louisiana (and
         possibly other Governmental Bodies).

5.5      OPERATIONS AFTER THE CLOSING:

         (a)   As an accommodation to PURCHASER, SELLER agrees to operate the
               Oil & Gas Interests for the account of the PURCHASER for a period
               not to extend past the end of the month following the month of
               Closing, or such earlier date as may be mutually agreed to by
               SELLER and PURCHASER coincident with the end of a month. The date
               when SELLER ceases to assist in the operation of the Oil & Gas
               Interests shall be referred to hereafter as the "Termination
               Date". SELLER further agrees to perform all accounting functions
               for the Oil & Gas Interests for a thirty (30) day period
               following the Termination Date at which date the PURCHASER shall
               assume all accounting functions (the "Accounting Closing Date").

         (b)   From the Closing Date to the Termination Date, as PURCHASER's
               designee, SELLER shall make good faith efforts to operate the Oil
               & Gas Interests as a prudent operator in the ordinary course of
               business and in material compliance with all applicable laws,
               ordinances, rules and regulations, orders, terms of permits and
               authorizations by any Governmental Body which may have
               jurisdiction over the Oil & Gas Interests. SELLER's duties as
               operator for PURCHASER during this period shall include marketing
               (and production reporting to the Governmental Bodies for the
               subject period) of produced oil and gas


                                    Page 29
<PAGE>   35


               consistent with past field practices. In the case of an oil
               spill, blowout, explosion, fire, storm, hurricane or any other
               emergency situation, SELLER shall have the right to make any
               necessary decisions or expenditures it deems appropriate in good
               faith as a prudent operator to operate the Oil & Gas Interests,
               and PURCHASER shall reimburse SELLER for any such expenditures.
               The parties hereby further agree that SELLER, its direct and
               indirect shareholders, Affiliates and parents, and its officers,
               directors, employees and agents, shall have no liability to
               PURCHASER, or any third party or Governmental Body and PURCHASER
               shall release, defend, and indemnify SELLER from any loss, costs,
               expenses, liability, property or environmental damage, or other
               damages to or incurred by PURCHASER or SELLER which are
               attributable to SELLER's operations of the Oil & Gas Interests
               from the Closing to the Termination Date, or other activities
               conducted by SELLER as set forth in this Section 5.5, despite the
               negligence or fault (ordinary or gross, sole or partial), except
               to the degree caused by the willful misconduct of SELLER. If
               Closing occurs, PURCHASER as of the Effective Time assumes
               responsibility for all costs and expenses associated with
               ownership and operation of the Oil & Gas Interests, including but
               not limited to operations, maintenance, repairs, recompletions
               and reconditioning, modifications, capital expenditures,
               abandonments and salvage. PURCHASER agrees to pay SELLER a fee of
               $300,000.00 per month for SELLER's general and administrative
               overhead hereunder from the Effective Time to the Accounting
               Closing Date. Except as provided in the preceding sentence,
               SELLER shall not be entitled to any compensation for its
               operation of the Oil & Gas Interests pursuant to this Section
               5.5(b). Such fee does not include the salaries and wages and
               associated burdens and benefits of SELLER's field employees
               directly employed in the operation of the Oil & Gas Interests,
               SELLER's employees directly employed on Shore Base Facilities or
               other Offshore Facilities serving the Oil and Gas Interests,
               first level supervisors of the


                                    Page 30
<PAGE>   36


               aforementioned field employees located at or near the Oil & Gas
               Interests, and technical employees directly employed on the Oil &
               Gas Interests.

         (c)   Pending MMS and/or the State of Louisiana approval of the
               assignment to PURCHASER of the Oil & Gas Interests, SELLER,
               effective as of the Closing, and subject to applicable joint
               operating agreements, will designate PURCHASER as Operator of the
               Oil & Gas Interests, where SELLER is Operator, and will seek all
               necessary third party approvals of that designation. Until
               PURCHASER is the designated operator with the MMS or such
               applicable Governmental Body, SELLER agrees that PURCHASER may
               act as SELLER's agent in performing the duties of Operator and
               PURCHASER shall be entitled to operate as though it is the
               approved owner of the Oil & Gas Interests, all at PURCHASER's
               sole cost, risk and expense.

         (d)   From the date of Closing to the Termination Date, SELLER shall
               endeavor to (i) assist PURCHASER in the training of personnel in
               the operations of the Oil & Gas Interests, (ii) attempt to retain
               existing contract staff familiar with the operation of the Oil &
               Gas Interests and (iii) provide PURCHASER telecommunication
               equipment and services under existing agreements with Shell
               Offshore Services Company ("SOSCO").

         (e)   From the date of Closing to the Accounting Closing Date, SELLER
               shall endeavor to make royalty payments that are due, pay
               appropriate rental payments and handle revenue and expenditure
               accounting, on the Oil & Gas Interests. For purposes of this
               section, revenue accounting functions shall


                                    Page 31
<PAGE>   37


               include disbursement of revenue proceeds to all working interest,
               royalty and overriding royalty owners as well as all rental and
               right of way payments. SELLER will complete revenue accounting
               for hydrocarbons produced during the period between the Closing
               and the Accounting Closing Date, it being further understood that
               this will entail the SELLER performing revenue settlement
               functions for such period after the Accounting Closing Date, but
               no longer than one hundred twenty (120) days after such date,
               unless mutually agreed to by the Parties. Expenditure accounting
               functions will include the payment of all expenditures and
               subsequent billing of same to all working interest owners. SELLER
               will complete expenditure accounting functions for the calendar
               months falling between the Closing and Accounting Closing Date.
               With regard to PURCHASER's interest in the Oil & Gas Interests,
               SELLER shall prepare and deliver to PURCHASER a detailed monthly
               statement of operating revenues and expenditures including but
               not limited to operating costs, capital expenditures, production
               and ad valorem taxes (hereinafter referred to as "Net Cash
               Flow"). The form and content of such statement will be determined
               by the Parties and will be issued as soon as practicable. From
               the Closing through Accounting Closing Date, SELLER shall remit
               to PURCHASER the Net Cash Flow from the Oil & Gas Interests on a
               monthly basis. Such payments will be made by wire transfer as
               soon as practicable, but in no event later than forty-five (45)
               days following the month of production.

         (f)   SELLER upon PURCHASER's written request will provide 30 days
               written notice of cancellation for crude oil sales contracts and
               gas sales contracts to Affiliates or third parties that are
               cancelable.


                                    Page 32
<PAGE>   38


         It is understood that SELLER shall not be obligated to provide any
         transportation for personnel and/or equipment to and from the Oil & Gas
         Interests. SELLER's expenses for such transportation related to the Oil
         & Gas Interests incurred from Closing to the Accounting Closing Date
         shall be billed to PURCHASER and included in the Final Accounting.



               SECTION 6 - GENERAL REPRESENTATIONS AND WARRANTIES

6.1      RECIPROCAL REPRESENTATIONS AND WARRANTIES: SELLER and PURCHASER each
         represent and warrant to the other, that as of the date of this
         Agreement and as of the Effective Time:

         (a)   CORPORATE ORGANIZATION: The Party making the representation is a
               corporation or a partnership, as applicable, validly existing and
               in good standing under the laws of that corporation's or
               partnership's state of incorporation or formation with the power
               and authority to own property and assets such as the Oil & Gas
               Interests and to carry on its business as now being conducted.

         (b)   REQUISITE APPROVALS: The Party making the representation has the
               corporate or partnership power and authority to execute and
               deliver this Agreement and to consummate the transaction
               contemplated in this Agreement. This Agreement constitutes a
               valid and binding obligation of the Party making the
               representation, enforceable against it in accordance


                                    Page 33
<PAGE>   39


               with the terms hereof, and no other corporate or partnership act,
               approval or proceeding on its part is required to authorize the
               execution and delivery of this Agreement or the consummation of
               the transaction contemplated hereunder. This Agreement (and all
               closing documents) are executed by appropriate officials having
               full authority to execute and deliver such documents on behalf of
               the Party making the representation.

         (c)   IMPEDIMENTS TO CONSUMMATION OF AGREEMENT: This Agreement, and the
               execution and delivery hereof by the representing and warranting
               Party, do not, and the consummation of the transaction
               contemplated hereunder will not, violate any provision of, or
               constitute a default under, the charter or by-laws of such Party
               or any law or regulation to which it is subject, or any provision
               of any agreement, indenture, mortgage, lien, lease, instrument,
               order, arbitration award, judgment, or decree to which it is a
               Party or by which it or any of its assets or properties is bound.

         (d)   BANKRUPTCY: There are no bankruptcy, reorganization or
               receivership proceedings pending, being contemplated or
               threatened against the Party making the representation.

6.2      SELLER'S REPRESENTATIONS & WARRANTIES: Each SELLER separately
         represents and warrants to PURCHASER, to the extent of its interest in
         the Oil & Gas Interests, that as of the date of this Agreement, subject
         to Section 10.3, and the Effective Time:


                                    Page 34
<PAGE>   40


         (a)   CONTRACTS & PERMITS: All material leases, contracts and Easements
               (except permits and licenses) affecting the Oil & Gas Interests
               have been made available to PURCHASER and are identified in
               Exhibit "1a" and/or Schedule 2.1.6 and, except to the extent of
               restrictions or prohibitions on transfer, are being transferred
               to PURCHASER in this transaction.

         (b)   COMPLIANCE WITH APPLICABLE LAWS: Except as set forth on Schedule
               6.2(b), where SELLER is the Operator, and to SELLER's Knowledge
               as respects Leases operated by others, operation of the Oil & Gas
               Interests is in compliance with all applicable laws or statutes,
               or any applicable regulations, rules or orders, judgments or
               decrees of all Governmental Bodies, the violation of which might
               materially and adversely affect the value to PURCHASER of any one
               or more of the Leases, or the Oil and Gas Interests, or the
               production therefrom.

         (c)   PREFERENTIAL PURCHASE RIGHTS AND CONSENTS TO ASSIGNMENT: Except
               as set forth on Schedule 6.2(c), the Leases are not subject to
               any agreements containing preferential purchase rights or consent
               to assignment provisions in favor of parties other than SELLER.

         (d)   LITIGATION: Except as set forth on Schedule 2.3.1, there are no
               pending suits, actions, arbitrations or proceedings directly
               relating to the Oil & Gas Interests as to which SELLER has been
               served process or received notice before any court or
               Governmental Body which would adversely affect the Oil & Gas
               Interests, or hinder, impede or prevent SELLER from


                                    Page 35
<PAGE>   41


               consummating the transactions contemplated by the Agreement. To
               SELLER's Knowledge, there are no pending suits, actions,
               arbitrations, mediations or proceedings directly relating to the
               Oil & Gas Interests as to which SELLER has not been served
               process or received notice, or that are threatened before any
               court or Governmental Body which would adversely affect the Oil &
               Gas Interests, or hinder, impede or prevent SELLER from
               consummating the transactions contemplated by the Agreement.


         (e)   TAXES: All ad valorem, property, production, excise, severance,
               windfall profit and similar taxes and assessments payable with
               respect to the Oil & Gas Interests and based on or measured by
               the ownership of property or the production or removal of
               hydrocarbons or the receipt of proceeds therefrom have been and
               will be timely paid in all respects.


         (f)   LEASES AND WELLS: To SELLER's Knowledge (i) SELLER is not in
               material default under any of the material terms and provisions
               of any of the Leases or under any agreement to which the same are
               subject; (ii) all royalties, rentals, and other payments due
               thereunder by SELLER have been timely and properly paid in full
               on or before the due dates thereof; and (iii) all of the Wells
               have been drilled, completed, and operated within the boundaries
               of the Leases or Oil & Gas Interests or within the limits
               otherwise permitted by contract, pooling, or unit agreement, and
               by law and in compliance with all applicable rules, regulations,
               permits, judgments, orders and decrees of any court or the
               federal and state regulatory authorities having jurisdiction
               thereof.

         (g)   MARKETING: Except as disclosed on Schedule 6.2(g), no amounts of
               hydrocarbons produced from the Oil & Gas Interests and marketed
               by SELLER and, to SELLER's Knowledge, no amount of SELLER's


                                    Page 36
<PAGE>   42


               hydrocarbons produced from the Oil & Gas Interests and marketed
               by others are subject to a sales or processing contract (except
               for contracts terminable without penalty by SELLER on not more
               than 30 days notice), and, no person has any call upon, option to
               purchase or similar rights under any agreement with respect to
               the Oil & Gas Interests or to the production therefrom. SELLER
               has not in any respect collected, nor will SELLER in any respect
               collect, any proceeds from the sale of hydrocarbons produced from
               the Oil & Gas Interests that are subject to refund by PURCHASER.
               As of the Effective Time, except as set forth in Schedule 6.2(g),
               proceeds from the sale of oil, condensate, and gas from the Oil &
               Gas Interests were being received in all respects by SELLER in a
               timely manner and were not being held in suspense for any reason.
               SELLER has not been nor will SELLER be obligated by virtue of any
               prepayment made under any gas transportation, production sales
               contract or any other contract containing a "take or pay" clause,
               or under any gas balancing, deferred production or similar
               arrangement, to deliver oil, gas or other minerals produced from
               or allocated to any of the Oil & Gas Interests at some future
               time without receiving full payment therefor at the time of
               delivery.

         (h)   CONTRACT RIGHTS: To SELLER's Knowledge, except as disclosed on
               Schedule 6.2(h), with respect to the Contract Rights: (i) as to
               SELLER, all Contract Rights which have not previously expired or
               been terminated by mutual agreement are in full force and effect
               and are the valid and legally binding obligations of the parties
               thereto and are enforceable in accordance with their respective
               terms, except to the extent that such enforcement may be limited
               by applicable bankruptcy, insolvency and similar laws affecting
               creditors' rights generally, and by general equitable


                                    Page 37
<PAGE>   43


               principles; (ii) SELLER is not in material breach or default with
               respect to any of their obligations under any material Contract
               Right; and (iii) neither SELLER nor any other party to any
               Contract Right has given or threatened to give notice of any
               action to terminate, cancel, rescind, or procure a judicial
               reformation of any Contract Right or any provision thereof.



         (i)   OPERATIONS AND OPEN AFES: To SELLER's Knowledge, except as
               disclosed on Schedule 6.2(i), with respect to the joint, unit, or
               other operating agreements relating to the Oil & Gas Interests:
               (i) there are no individual outstanding calls or payments under
               authorities for expenditures ("AFE's") in excess of $100,000.00
               for which PURCHASER would be liable; and (ii) there are no
               material operations under the operating agreements relating to
               the Oil & Gas Interests with respect to which SELLER has become a
               non-consenting party.

         (j)   ENVIRONMENTAL MATTERS: To SELLER's Knowledge, and only as to
               those Oil & Gas Interests where SELLER is the Operator, except as
               disclosed on Schedule 6.2(j): (i) SELLER has obtained all
               permits, licenses, and other authorizations that are required
               under federal, state, and local laws with respect to pollution or
               protection of the environment relating to the Oil & Gas
               Interests, including laws relating to actual or threatened
               emissions, discharges, or releases of pollutants, contaminants,
               or hazardous substances, or other toxic materials or wastes into
               ambient air, surface water, ground water or land, or otherwise
               relating to the manufacture, processing, distribution, use,
               treatment, storage, disposal, transport, or handling of
               pollutants, contaminants of hazardous substances, or other toxic
               materials or wastes ("Environmental Laws"); and (ii) SELLER and
               the Oil & Gas Interests are in compliance in all material
               respects with all


                                    Page 38
<PAGE>   44


               Environmental Laws and all material terms and conditions of such
               permits, licenses and authorizations. SELLER has not received
               written notice of any conditions, circumstances, activities,
               practices, incidents, actions, or plans that are reasonably
               likely to interfere or prevent continued compliance, or that are
               reasonably likely to give rise to any material liability, or
               otherwise form the basis of any material claim, action, suit,
               proceeding, hearing or investigation, based on or related to the
               processing, distribution, use, treatment, storage, disposal,
               transport, or handling, or the emission, discharge, release or
               threatened release into the environment, of any pollutant,
               contaminant, or hazardous substance or other toxic material or
               waste from or attributable to any Oil & Gas Interest.

         (k)   WORKING INTEREST/NET REVENUE INTEREST: SELLER's Working Interest
               and Net Revenue Interest in each of the Leases are as shown on
               Exhibit "1a" and for purposes of SELLER's by, through and under
               warranty as defined in Section 3.1, SELLER warrants that SELLER
               is delivering the Working Interest and Net Revenue Interest
               reflected on Exhibit "1a".

         (l)   AFFILIATE CONTRACTS: Except as described on Schedule 6.2(l),
               there are no existing contracts between SELLER and any of its
               Affiliates affecting or providing services or support to any of
               the Oil & Gas Interests or operations on the Oil & Gas Interests
               that will be binding on PURCHASER.

         (m)   BROKER'S FEES: SELLER has not incurred any liability, contingent
               or otherwise, for brokers' or finders' fees relating to the
               transactions contemplated by this Agreement for which PURCHASER
               shall have any responsibility whatsoever.


                                    Page 39
<PAGE>   45


         (n)   NO ENCUMBRANCES: Except as described on Schedule 6.2(n), and
               subject to Section 3.1, SELLER has title to the Oil & Gas
               Interests free and clear of all liens, pledges, encumbrances and
               adverse claims created by, through or under SELLER, its
               subsidiaries or Affiliates. Except as set forth on Schedule
               6.2(n), there are no overriding royalties, production payments,
               net profit interests or other revenue burdens on the Leases,
               other than the Affiliate overrides which are being conveyed
               hereunder to PURCHASER, and the royalty due the MMS or the State
               of Louisiana under each of the Leases.

         (o)   NO TAX PARTNERSHIP: Except as set forth under Schedule 6.2(o),
               none of the Oil & Gas 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 Schedule 2.1.6.

         (p)   SECTION 754 ELECTION: For each partnership, joint venture or tax
               partnership to which any of the Oil & Gas Interests are subject,
               SELLER shall, at PURCHASER's election assist PURCHASER to cause
               each partnership, joint venture or tax partnership to elect under
               Section 754 of the Code to adjust the basis of its Oil & Gas
               Interests with respect to the transfer of the partnership
               interest, effective for the taxable year of the transfer. With
               respect to each such partnership, joint venture or tax
               partnership of SELLER, SELLER shall exercise its reasonable
               efforts in making available to PURCHASER all financial and tax
               data necessary or reasonably helpful to determine whether a
               Section 754 election would be advantageous to PURCHASER for the
               taxable year of the Closing.

         (q)   PLUGGING OBLIGATIONS: Except as disclosed on Schedule 6.2(q) and
               except as required by Governmental Body regulations, there are no
               Wells, platforms


                                    Page 40
<PAGE>   46


               or pipelines located on the Leases that SELLER is currently
               obligated by order of any Governmental Body to remove or plug and
               abandon within twelve (12) months of Closing.

         (r)   EXCHANGE/REMOVAL OF EQUIPMENT: Except as disclosed on Schedule
               6.2(r), between April 9, 1999 and the Termination Date, with
               respect to each of the Oil & Gas Interests, (i) SELLER has not
               exchanged any equipment, fixtures, inventory, spare parts, tools
               and other personal property for property of lesser value and (ii)
               has not removed any idle or other equipment or inventory from the
               Oil & Gas Interests except with the prior approval of PURCHASER.

         (s)   MMS AND STATE OF LOUISIANA APPROVAL: Except as set forth on
               Schedule 6.2(s), SELLER is not aware of the existence of any fact
               or condition with respect to the Oil & Gas Interests that may
               cause the MMS or the State of Louisiana to withhold its
               unconditional approval of the assignments contemplated herein
               that require approval of the applicable Governmental Body.

         (t)   REVERSIONARY RIGHTS: 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 SELLER's rights in the Leases or Platforms & Facilities
               included in the Oil & Gas Interests to less than the Working
               Interest set forth with respect to the applicable Lease listed in
               Exhibit "1a".

         (u)   INSPECTION REPORTS: To SELLER's Knowledge, PURCHASER has been
               furnished all MMS or other regulatory inspection reports and
               findings conducted during SELLER's ownership of the Oil & Gas
               Interests, subject to


                                    Page 41
<PAGE>   47


               the destruction of documents pursuant to SELLER's standard record
               retention policies.


         (v)   PRODUCER, FIELD AND PIPELINE IMBALANCES: To SELLER's Knowledge,
               Schedule 6.2(v) is a complete and accurate description of all
               producer, field and pipeline imbalances as of the Effective Time
               between (i) the amount of hydrocarbons produced from the Oil &
               Gas Interests and allocated to SELLER and (ii) the share of
               production to which SELLER was entitled, and there are no other
               imbalances.


         (w)   PAY-OUT REPORTS: To SELLER's Knowledge, Schedule 6.2(w) reflects
               the pay-out status of any non-consent or other penalties relating
               to or affecting the Oil & Gas Interests as of the Effective Time.

6.3      PURCHASER'S REPRESENTATIONS & WARRANTIES: PURCHASER represents and
         warrants to SELLER, that as of the date of this Agreement, the
         Effective Time and the Closing:

         (a)   RECEIPT OF DATA: PURCHASER represents that it has had the
               opportunity to perform due diligence on the Oil & Gas Interests
               that PURCHASER wishes to purchase, which includes physical
               inspection(s), environmental assessment(s), reviewing well data
               and other files, and performing all necessary tasks involved in
               evaluating the Oil & Gas Interests.

         (b)   INDEPENDENT EVALUATION: PURCHASER represents and acknowledges
               that it is knowledgeable of the oil and gas business and of the
               usual and customary practices of producers such as SELLER and
               that it has had


                                    Page 42
<PAGE>   48


               access to the Oil & Gas Interests, the officers and employees of
               SELLER, and the books, records and files of SELLER relating to
               the Oil & Gas Interests. In making the decision to enter into
               this Agreement and consummate the transactions contemplated
               hereby, PURCHASER, subject to Section 6.4(b), has relied solely
               on the basis of its own independent due diligence investigation
               of the Oil & Gas Interests. ACCORDINGLY, PURCHASER ACKNOWLEDGES
               THAT SELLER HAS NOT MADE, AND SELLER HEREBY EXPRESSLY DISCLAIMS
               AND NEGATES ANY REPRESENTATION OR WARRANTY (OTHER THAN THOSE
               EXPRESS LIMITED REPRESENTATIONS AND WARRANTIES MADE IN SECTION 6
               OF THIS AGREEMENT), EXPRESS, IMPLIED, AT COMMON LAW, BY STATUTE
               OR OTHERWISE, RELATING TO THE OIL & GAS INTERESTS.

         (c)   NO SECURITIES DISTRIBUTION: PURCHASER represents to SELLER that
               PURCHASER intends to acquire the Oil & Gas Interests for
               PURCHASER's own benefit and account and that PURCHASER is not
               acquiring such interests with the intent to make a sale or
               distribution thereof in violation of applicable federal or state
               securities laws and regulations. If, in the future, PURCHASER
               should sell or otherwise dispose of the Oil & Gas Interests in
               any manner that would be subject to securities regulation,
               PURCHASER will fully comply with all federal and state securities
               laws.

         (d)   BROKER'S FEES: PURCHASER has not incurred any 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.


                                    Page 43
<PAGE>   49


         (e)   GOVERNMENTAL BODY APPROVAL: To PURCHASER's Knowledge, except as
               set forth on Schedule 6.3(e), PURCHASER is not aware of the
               existence of any fact or condition with respect to the Oil & Gas
               Interests that may cause the MMS or the State of Louisiana to
               withhold its unconditional approval of the assignments
               contemplated herein that require approval of the applicable
               Governmental Body.


         (f)   TRANSPORTATION AGREEMENTS: PURCHASER acknowledges that SELLER has
               not warranted or represented to PURCHASER that any transportation
               agreements with respect to the Oil & Gas Interests will be
               assigned to PURCHASER pursuant to the transaction contemplated by
               the Agreement, except as to those transportation agreements
               identified on Exhibit "1a".

6.4      RELIANCE:

         (a)   BY SELLER: PURCHASER acknowledges that SELLER is entering this
               transaction relying upon PURCHASER's representations and
               warranties, upon PURCHASER's assumption of obligations and
               liabilities pertaining to the Oil & Gas Interests and upon the
               agreements and undertakings of PURCHASER provided for herein.

         (b)   BY PURCHASER: SELLER acknowledges that PURCHASER is entering this
               transaction relying upon SELLER's representations and warranties
               and upon the agreements and undertakings of SELLER provided for
               herein.

6.5      SURVIVAL OF REPRESENTATIONS & WARRANTIES: Subject to Section 9 hereof,
         all of the representations, warranties, indemnities and agreements of
         or by the Parties to this


                                    Page 44
<PAGE>   50


         Agreement shall survive the Closing of this transaction as provided
         herein and shall not merge into the conveyancing documents.


                  SECTION 7 - ACCOUNTING FOR REVENUE & EXPENSES


7.1      ADJUSTMENTS: Anything herein to the contrary notwithstanding, all
         hydrocarbon production revenues and expenses (including without
         limitation, Lease rental or maintenance expenses, capital expenditures
         or prepaid charges and royalties, overriding royalties, and other
         payments out of production, but excluding all non-cash charges
         attributable to depletion, depreciation, bad debt losses, lease
         abandonment, etc.), pertaining to production from or attributable to
         any part of the Oil & Gas Interests and relating to the period prior to
         the Effective Time, shall be owned by and borne by SELLER ("SELLER
         Amounts") and all similar hydrocarbon production revenues and expenses,
         produced from or attributable to the Oil & Gas Interests conveyed by
         SELLER to PURCHASER pursuant to this Agreement, which relate to the
         period after the Effective Time, shall be owned by and borne by
         PURCHASER ("PURCHASER Amounts"). The Purchase Price shall be adjusted
         based on the PURCHASER Amounts and SELLER Amounts specified in the
         financial closing document submitted by SELLER and reasonably agreed to
         by PURCHASER at or prior to Closing. All other SELLER Amounts or
         PURCHASER Amounts not specifically set forth on the financial closing
         document shall be handled in accordance with Section 7.1.1.

         7.1.1 FINAL ACCOUNTING:

         (a)   SELLER and PURCHASER shall use their best efforts to accomplish a
               single final accounting and cash adjustment for the period
               between the


                                    Page 45
<PAGE>   51


               Effective Time and the Closing no later than one-hundred and
               twenty (120) days after Closing to accomplish the purposes of
               Section 7.1 and of this Agreement ("Final Accounting"). SELLER
               shall prepare the Final Accounting and submit same to PURCHASER
               for acceptance. To the extent reasonably required by SELLER,
               PURCHASER shall assist in the preparation of the Final
               Accounting. PURCHASER shall have the right to audit the Final
               Accounting. The Parties' failure to complete the Final Accounting
               shall not constitute a waiver of the right to receive any amount
               otherwise due. The Final Accounting shall become final and
               binding upon the Parties and payable ninety (90) days after
               receipt thereof by PURCHASER (the "Final Accounting Date") unless
               PURCHASER gives written notice of its desire to audit or of its
               disagreement (an "Accounting Notice") to SELLER prior to such
               date. Time is of the essence with respect to the Accounting
               Notice. Any Accounting Notice which sets out a disagreement shall
               specify in detail the dollar amount, nature and basis of any
               disagreement so asserted. If an Accounting Notice is received by
               SELLER in a timely manner, then, following any requested audit,
               the Final Accounting (as revised in accordance with clause (i) or
               (ii) below) shall become final and binding on the Parties and any
               amounts due shall be payable by the earlier of thirty (30) days
               after (i) the date SELLER and PURCHASER agree in writing with
               respect to all matters as to which there is a disagreement or
               (ii) the date on which the Arbitrator (as hereinafter defined)
               issues its decision.

         (b)   During the ninety (90) days following the date of receipt by
               SELLER of an Accounting Notice which requests an audit, SELLER
               shall make available the necessary records to permit the audit
               and SELLER and PURCHASER shall attempt (in good faith) to resolve
               in writing any differences that they may have with respect to all
               matters specified in the Accounting Notice or


                                    Page 46
<PAGE>   52


               discovered in the audit. If, at the end of the sixty (60) day
               period, SELLER and PURCHASER have not reached agreement on such
               matters, pursuant to the arbitration provision of this Agreement
               and this Section, the matters that remain in dispute shall be
               submitted to an arbitrator (the "Arbitrator") for review and
               final binding resolution. The Arbitrator shall be a member of a
               recognized independent public accounting firm and shall be agreed
               upon by SELLER and PURCHASER in writing. All determinations and
               adjustments with respect to allocating items to the period before
               or after the Effective Time shall be in accordance with generally
               accepted accounting principles, consistently applied. The
               Arbitrator shall render a decision resolving the matters in
               dispute within fifteen (15) days following their submission to
               the Arbitrator. The Arbitrator's decision reached in accordance
               with the above paragraphs shall be final, and shall not be
               subject to further arbitration under Section 10.9.



         (c)   If SELLER or PURCHASER at any time after the Final Accounting
               receives any proceeds or pay any additional expenses for or on
               behalf of the other Party (in the case of PURCHASER, SELLER
               Amounts, and in the case of SELLER, PURCHASER Amounts), they
               shall promptly invoice the other Party for such expenses (who
               shall promptly pay such invoice) or remit to the other Party the
               proceeds received (to the extent such amounts had not been
               previously accounted for in the Final Accounting).

         7.1.2 NOTICE TO REMITTERS OF PROCEEDS: After the Accounting Closing
               Date, the SELLER shall inform the remitters to pay PURCHASER to
               the extent practical the revenues after the Effective Time. To
               the extent that any remitter pays revenues to the incorrect
               Party, that Party shall promptly remit such revenues (without
               interest) to the correct Party.


                                    Page 47
<PAGE>   53


7.2      ALLOCATION OF TAX LIABILITIES: All taxes (except state or federal
         income taxes and franchise taxes) pertaining to the Oil & Gas Interests
         or production from the Oil & Gas Interests and similar obligations
         ("Taxes") are SELLER's responsibility where attributable to the period
         prior to the Effective Time and PURCHASER's responsibility where
         attributable to the period after the Effective Time (regardless of when
         assessed on the Oil & Gas Interests). To the extent possible, amounts
         relating to Taxes shall be included in the Final Accounting. Each Party
         shall be responsible for its own state or federal income taxes or
         franchise taxes. After the Effective Time, each Party shall supply the
         other Party all information and documents reasonably necessary to
         comply with tax and financial reporting requirements and audits.


                       SECTION 8 - PURCHASER'S OBLIGATIONS


8.1      PURCHASER'S ASSUMED OBLIGATIONS: After the Closing, PURCHASER, subject
         to Sections 2.3.1 and 2.5.3, shall assume and perform all of the
         rights, duties, obligations and liabilities of ownership of the Oil &
         Gas Interests, as follows:


         (a)   The express and implied obligations, conditions and covenants
               under the terms of each Lease or the contracts referenced in
               Section 2.3 to which the Oil & Gas Interests are subject; and

         (b)   Responsibility for compliance with all applicable laws,
               regulations, ordinances, rules and orders and the procurement and
               maintenance of all


                                    Page 48
<PAGE>   54


               permits and bonds required by Governmental Bodies relating to the
               Oil & Gas Interests and which accrue after the Closing; and

         (c)   Subject to Section 5.5(e), responsibility for the payment of
               royalties, overriding royalties, net profits interests, rentals,
               shut-in payments (if any) to which the Oil & Gas Interests are
               subject and which are attributable to the period after the
               Closing; and

         (d)   All other obligations assumed by PURCHASER under the terms of
               this Agreement.

8.2      PLUGGING AND ABANDONMENT OF WELLS, REMOVAL OF PLATFORMS & FACILITIES:
         Regardless of whether listed on Exhibits "1b" or "1c", PURCHASER
         recognizes and specifically assumes SELLER's obligation to:

         (i)   properly plug and abandon any and all oil, gas or condensate
               Wells; and

         (ii)  properly remove and dispose of all Platforms & Facilities,
               including but not limited to, platforms, templates, pipelines,
               gathering systems and all flowlines; and

         (iii) restore each Lease and wellsite(s) associated with the Oil & Gas
               Interests; all in accordance with the rules, regulations, and
               requirements of any Governmental Body, and in accordance with all
               obligations, express or implied, in any contract assumed by
               PURCHASER, whether or not any such obligations arise prior to or
               after the Effective Time. PURCHASER agrees to pay all costs and
               expenses associated with any such plugging and abandoning,
               removal, or restoration.


                                    Page 49
<PAGE>   55


              SECTION 9 - DISCLAIMER OF WARRANTY / INDEMNIFICATION


9.1      SALE "AS IS" "WHERE IS": PURCHASER REPRESENTS THAT IT HAS INSPECTED, OR
         HAS HAD THE OPPORTUNITY TO INSPECT, THE OIL & GAS INTERESTS AND
         ACCEPTED THE PHYSICAL AND ENVIRONMENTAL CONDITION OF SAME ON AN "AS
         IS-WHERE IS" BASIS SUBJECT TO THE TERMS OF THIS AGREEMENT. PURCHASER
         RELEASES SELLER FROM ANY LIABILITY WITH RESPECT TO THE PHYSICAL AND
         ENVIRONMENTAL CONDITION OF THE OIL & GAS INTERESTS AT THE CLOSING
         (OTHER THAN AS MAY BE PROVIDED FOR UNDER THIS AGREEMENT) WHETHER OR NOT
         CAUSED BY OR ATTRIBUTABLE TO SELLER'S NEGLIGENCE, FAULT, OR STRICT
         LIABILITY, AND WHETHER OR NOT ARISING DURING THE PERIOD OF, OR FROM, OR
         IN CONNECTION WITH SELLER'S OWNERSHIP OF THE OIL & GAS INTERESTS OR USE
         OF THE PROPERTY DESCRIBED IN THE LEASES BEFORE OR AT THE CLOSING.
         WITHOUT LIMITING THE ABOVE, PURCHASER WAIVES ANY RIGHT, EXCEPT TO THE
         EXTENT OTHERWISE PROVIDED FOR IN THIS AGREEMENT, TO RECOVER FROM SELLER
         AND FOREVER RELEASES AND DISCHARGES SELLER AND SUBJECT TO, AND AS
         PROVIDED IN, THIS AGREEMENT, AGREES TO RELEASE, INDEMNIFY, DEFEND AND
         HOLD SELLER HARMLESS FROM ANY AND ALL DAMAGES, CLAIMS, LOSSES,
         LIABILITIES, PENALTIES, FINES, LIENS, JUDGMENTS, COSTS AND EXPENSES
         WHATSOEVER, (INCLUDING WITHOUT LIMITATION, ATTORNEYS' FEES AND COSTS),
         WHETHER DIRECT OR INDIRECT, KNOWN OR UNKNOWN, FORESEEN OR UNFORESEEN,
         THAT MAY ARISE ON ACCOUNT OF OR IN ANY WAY BE CONNECTED WITH THE
         PHYSICAL AND ENVIRONMENTAL CONDITION OF THE OIL & GAS INTERESTS AT THE
         CLOSING OR ANY LAW OR REGULATION APPLICABLE THERETO, INCLUDING WITHOUT
         LIMITATION, THE COMPREHENSIVE ENVIRONMENTAL RESPONSE, COMPENSATION AND
         LIABILITY ACT OF 1980, AS AMENDED (42


                                    Page 50
<PAGE>   56


         U.S.C. SECTION 9601 ET. SEQ.), THE RESOURCE CONSERVATION AND RECOVERY
         ACT OF 1976 (42 U.S.C. SECTION 6901 ET. SEQ.), THE CLEAN WATER ACT (33
         U.S.C. SECTIONS 466 ET. SEQ.), THE SAFE DRINKING WATER ACT (14 U.S.C.
         SECTION 1401-1450), THE HAZARDOUS MATERIALS TRANSPORTATION ACT (49
         U.S.C. SECTION 7401 ET. SEQ.), AS AMENDED, THE CLEAN AIR ACT AMENDMENTS
         OF 1990, AND ANY OTHER APPLICABLE FEDERAL, STATE OR LOCAL LAW, WHETHER
         OR NOT ARISING DURING THE PERIOD OF, OR FROM, OR IN CONNECTION WITH,
         SELLER'S OWNERSHIP OF THE OIL & GAS INTERESTS OR USE OF THE PROPERTY
         DESCRIBED IN THE LEASES AT OR PRIOR TO THE CLOSING, AND WHETHER OR NOT
         ATTRIBUTABLE TO THE STRICT LIABILITY OF SELLER OR TO THE SOLE, JOINT OR
         CONCURRENT, ACTIVE OR PASSIVE, NEGLIGENCE OF SELLER, EVEN IF CAUSED BY
         THE GROSS NEGLIGENCE OR WILLFUL MISCONDUCT OF SELLER PRIOR TO CLOSING.

9.2      DISCLAIMER REGARDING OIL & GAS INTERESTS: PURCHASER ACKNOWLEDGES THAT,
         EXCEPT AS SPECIFICALLY PROVIDED IN THIS AGREEMENT, SELLER HAS NOT MADE,
         AND SELLER HEREBY EXPRESSLY DISCLAIMS AND NEGATES, ANY COVENANT,
         REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, RELATING TO THE
         CONDITION OF ANY IMMOVABLE PROPERTY, MOVABLE PROPERTY, EQUIPMENT,
         INVENTORY, MACHINERY, FIXTURES AND PERSONAL PROPERTY CONSTITUTING PART
         OF THE OIL & GAS INTERESTS (INCLUDING, WITHOUT LIMITATION, (a) ANY
         IMPLIED OR EXPRESS WARRANTY OF MERCHANTABILITY (b) ANY IMPLIED OR
         EXPRESS WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, (c) ANY IMPLIED
         OR EXPRESS WARRANTY OF CONFORMITY TO MODELS OR SAMPLES OF MATERIALS,
         (d) ANY RIGHTS OF PURCHASER UNDER APPROPRIATE STATUTES TO CLAIM
         DIMINUTION OF CONSIDERATION OR RETURN OF THE PURCHASE PRICE, (e) ANY
         IMPLIED OR EXPRESS


                                    Page 51
<PAGE>   57


         WARRANTY OF FREEDOM FROM PATENT OR TRADEMARK INFRINGEMENT, (f) ANY
         IMPLIED OR EXPRESS WARRANTY OF FREEDOM FROM REDHIBITORY VICES OR
         DEFECTS OR OTHER VICES OR DEFECTS, WHETHER KNOWN OR UNKNOWN, (g) ANY
         AND ALL IMPLIED WARRANTIES EXISTING UNDER APPLICABLE LAW NOW OR
         HEREAFTER IN EFFECT AND (h) ANY IMPLIED OR EXPRESS WARRANTY REGARDING
         ENVIRONMENTAL LAWS, THE RELEASE OF MATERIALS INTO THE ENVIRONMENT OR
         PROTECTION OF THE ENVIRONMENT OR HEALTH, IT BEING THE EXPRESS INTENTION
         OF SELLER AND PURCHASER THAT THE IMMOVABLE PROPERTY, MOVABLE PROPERTY,
         EQUIPMENT, INVENTORY, MACHINERY, FIXTURES AND PERSONAL PROPERTY SHALL
         BE CONVEYED TO PURCHASER AS IS AND IN THEIR PRESENT CONDITION AND STATE
         OF REPAIR AND PURCHASER REPRESENTS TO SELLER THAT PURCHASER HAS MADE OR
         CAUSED TO BE MADE SUCH INSPECTIONS WITH RESPECT TO THE IMMOVABLE
         PROPERTY, MOVABLE PROPERTY, EQUIPMENT, INVENTORY, MACHINERY, FIXTURES
         AND PERSONAL PROPERTY AS PURCHASER DEEMS APPROPRIATE AND PURCHASER WILL
         ACCEPT THE IMMOVABLE PROPERTY, MOVABLE PROPERTY, EQUIPMENT, INVENTORY,
         MACHINERY, FIXTURES AND PERSONAL PROPERTY AS IS, IN THEIR PRESENT
         CONDITION AND STATE OF REPAIR.

9.3      DISCLAIMER REGARDING INFORMATION: SELLER HEREBY EXPRESSLY NEGATES AND
         DISCLAIMS, AND PURCHASER HEREBY WAIVES, AND ACKNOWLEDGES THAT SELLER
         HAS NOT MADE, ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED,
         RELATING TO (a) THE ACCURACY, COMPLETENESS OR MATERIALITY OF ANY
         INFORMATION, DATA OR OTHER MATERIALS (WRITTEN OR VERBAL) NOW,
         HERETOFORE, OR HEREAFTER FURNISHED TO PURCHASER BY OR ON BEHALF OF
         SELLER OR (b)


                                    Page 52
<PAGE>   58


         PRODUCTION RATES, RECOMPLETION OPPORTUNITIES, DECLINE RATES, GEOLOGICAL
         OR GEOPHYSICAL DATA OR INTERPRETATIONS, THE QUALITY, QUANTITY,
         RECOVERABILITY OR COST OF RECOVERY OF ANY HYDROCARBON RESERVES, ANY
         PRODUCT PRICING ASSUMPTIONS, OR THE ABILITY TO SELL OR MARKET ANY
         HYDROCARBONS AFTER CLOSING.


9.4      INDEMNIFICATION:

         (a)   PURCHASER shall release, indemnify, defend and hold harmless
               SELLER and its respective Affiliates, and each SELLER's and each
               such Affiliate's directors, officers, employees, stockholders and
               agents ("SELLER GROUP"), from and against any and all claims,
               liabilities, losses, causes of actions, damages, costs and
               expenses (including, without limitation, those involving theories
               of negligence or strict liability and including court costs and
               attorneys' fees) ("Losses") asserted against, resulting from,
               imposed upon or incurred by SELLER GROUP (i) as a result of, or
               arising out of, the breach of any of the representations or
               warranties of PURCHASER contained in this Agreement, or (ii) as a
               result of, or arising out of, PURCHASER's ownership or operation
               of the Oil & Gas Interests, including, but not limited to, the
               obligation to properly plug and abandon all Wells and remove all
               Platforms & Facilities now or hereafter located on any of the Oil
               & Gas Interests as set forth in Sections 8.1 and 8.2, or (iii) as
               a result of, or arising out of, any matter or circumstance
               relating to the Environmental Obligations assumed by PURCHASER
               pursuant to Section 2.5.2, or (iv) as a result of, or arising out
               of the matters described in Sections 2.3 (except as provided for
               in Section 2.3.1), 9.2, and 9.3


                                    Page 53
<PAGE>   59


               (except as provided for in Section 2.5.3), regardless in each
               case whether known or unknown, whether attributable to periods of
               time before or after the Effective Time or Closing, and
               REGARDLESS OF THE STRICT LIABILITY OF SELLER GROUP OR WHETHER
               SELLER GROUP WAS OR WAS ALLEGED TO HAVE BEEN NEGLIGENT, INCLUDING
               WITHOUT LIMITATION, THE SOLE, JOINT OR CONCURRENT, ACTIVE OR
               PASSIVE NEGLIGENCE OF SELLER GROUP, EVEN IF SELLER GROUP WAS OR
               WAS ALLEGED TO HAVE BEEN GROSSLY NEGLIGENT OR GUILTY OF WILLFUL
               MISCONDUCT.

         (b)   SELLER shall release, indemnify, defend and hold harmless
               PURCHASER and its Affiliates, and its and their respective
               directors, officers, employees, stockholders and agents
               ("PURCHASER GROUP") from and against all Losses asserted against,
               resulting from, imposed upon or incurred by PURCHASER GROUP as a
               result of, or arising out of (i) the breach of any of the
               representations or warranties of SELLER contained in this
               Agreement (except with respect to any error in Schedules 6.2 (i),
               6.2 (v), 6.2 (w) and 6.2 (x), for which SELLER assumes no
               liability), (ii) liabilities attributable to the Excluded Assets,
               (iii) any matter or circumstance described in Sections 2.3.1 or
               2.5.3, or (iv) the breach of the limited title warranty in
               Section 3.1.

         (c)   The liability of SELLER and PURCHASER under this Agreement and
               any documents delivered in connection herewith or contemplated
               hereby shall be limited as follows:

               (i)   In no event shall any amounts be recovered from SELLER
                     under Subsection 9.4(b)(i) for any breach of any
                     representation or warranty


                                    Page 54
<PAGE>   60


                     of SELLER set forth in the Agreement for which a written
                     notice of claim specifying in reasonable detail the
                     specific nature of the Losses and the estimated amount of
                     such Losses ("Claim Notice") is not delivered to SELLER
                     prior to the close of business on November 1, 2000 at 5:00
                     p.m., local time, and the indemnity obligation of SELLER in
                     Subsections 9.4(b)(i) with respect to such representations
                     and warranties shall terminate on said date.

               (ii)  The representations and warranties of the Parties set forth
                     in Section 6 of this Agreement shall survive the Closing
                     for a period of eighteen (18) months and shall terminate at
                     5:00 p.m., local time in New Orleans, Louisiana, on
                     November 1, 2000; provided, however, that any such
                     representation or warranty that is the subject of a Claim
                     Notice delivered in good faith in compliance with the
                     requirements of Section 9.4(d) shall survive with respect
                     only to the specific matter described in such Claim Notice
                     until the earlier to occur of (A) the date on which a final
                     nonappealable resolution of the matter described in such
                     Claim Notice has been reached or (B) the date on which the
                     matter described in such Claim Notice has otherwise reached
                     final resolution. Other than as set forth in Section
                     2.5.3(c), this eighteen (18) month period shall have no
                     applicability to the respective obligations of PURCHASER
                     and SELLER under Sections 9.1 through 9.4(b) (but excluding
                     Section 9.4(b)(i)) and Section 4.5.

               (iii) Notwithstanding anything to the contrary herein, in no
                     event shall (i) SELLER GROUP or PURCHASER GROUP be liable
                     to the other for punitive, exemplary, consequential, or
                     special damages; (ii) SELLER GROUP indemnify PURCHASER
                     GROUP or any other


                                    Page 55
<PAGE>   61


                     person, or be otherwise liable in any way whatsoever to
                     PURCHASER GROUP or any other person, for any Losses arising
                     from the breach of a representation or warranty of SELLER
                     GROUP in excess of an amount equal to $80,000,000; and
                     (iii) SELLER GROUP indemnify PURCHASER GROUP, or be
                     otherwise liable to PURCHASER GROUP, for any losses until
                     PURCHASER GROUP has suffered losses in the aggregate in
                     excess of a deductible in an amount equal to $2,000,000.00,
                     after which point SELLER GROUP will be obligated only to
                     indemnify PURCHASER GROUP from and against further losses
                     in excess of such deductible.



               (iv)  No amount shall be recovered from any Party for the breach
                     or untruth of any representations or warranties, of the
                     other Party, or for any other matter, to the extent that
                     the Party claiming a Loss as a result thereof had actual
                     knowledge of such breach, untruth or other matter at or
                     prior to the Closing, nor, in such event, shall PURCHASER
                     be entitled to rescission with respect to any such matter.


         (d)   All claims for indemnification under this Agreement shall be
               asserted and resolved pursuant to this Section 9.4(d). Any person
               claiming indemnification hereunder is hereinafter referred to as
               the "Indemnified Party" and any person against whom such claims
               are asserted hereunder is hereinafter referred to as the "
               Indemnifying Party." In the event that any Losses are asserted
               against or sought to be collected from an Indemnified Party by a
               third party, said Indemnified Party shall with reasonable
               promptness provide to the Indemnifying Party a Claim Notice. The
               Indemnifying Party shall not be obligated to indemnify the
               Indemnified


                                    Page 56
<PAGE>   62


               Party with respect to any such Losses if the Indemnified Party
               fails to notify the Indemnifying Party thereof in accordance with
               the provisions of this Agreement in reasonably sufficient time so
               that the Indemnifying Party's ability to defend against the
               Losses is not materially prejudiced. The Indemnifying Party shall
               have thirty (30) days from the personal delivery or receipt of
               the Claim Notice (the "Notice Period") to notify the Indemnified
               Party (i) whether or not it disputes the liability of the
               Indemnifying Party to the Indemnified Party hereunder with
               respect to such Losses and/or (ii) whether or not it desires, at
               the sole cost and expense of the Indemnifying Party, to defend
               the Indemnified Party against such Losses; provided, however,
               that any Indemnified Party is hereby authorized prior to and
               during the Notice Period to file any motion, answer or other
               pleading that it shall deem necessary or appropriate to protect
               its interests or those of the Indemnifying Party (and of which it
               shall have given notice and opportunity to comment to the
               Indemnifying Party). In the event that the Indemnifying Party
               notifies the Indemnified Party within the Notice Period that it
               desires to defend the Indemnified Party against such Losses, the
               Indemnifying Party shall have the right to defend all appropriate
               proceedings, and with counsel of its own choosing, which
               proceedings shall be promptly settled or prosecuted by them to a
               final conclusion. If the Indemnified Party desires to participate
               in, but not control, any such defense or settlement it may do so
               at its sole cost and expense. If requested by the Indemnifying
               Party, the Indemnified Party agrees to cooperate with the
               Indemnifying Party and its counsel in contesting any Losses that
               the Indemnifying Party elects to contest or, if appropriate and
               related to the claim in question, in making any counterclaim
               against the person asserting the third party Losses, or any
               cross-complaint against any person. No claim may be settled or
               otherwise compromised without the prior written consent of the
               Indemnifying Party and no claim may be settled or compromised by
               the Indemnifying Party without the prior written consent


                                    Page 57
<PAGE>   63


               of the Indemnified Party unless such settlement or compromise
               entails a full and unconditional release of the Indemnified Party
               (and any other members of the Indemnified Party's group, i.e.,
               SELLER GROUP or PURCHASER GROUP) without any admission or finding
               of fault or liability.


                     SECTION 10 - ADMINISTRATIVE PROVISIONS


10.1     EXPENSES OF SALE: Except as otherwise specifically provided herein,
         each Party to this Agreement shall pay its own expenses (including
         without limitation, the fees and expenses of their respective agents,
         representatives, counsel and accountants) with respect to the
         negotiation, execution and the delivery of this Agreement and the
         consummation of the transactions under this Agreement.

10.2     THIRD PARTY RIGHTS: Except as to those indemnity obligations owed to
         the indemnified entities or persons listed in Section 9 hereof,
         notwithstanding any other provision of this Agreement, this Agreement
         shall not create benefits on behalf of any person who is not a Party to
         this Agreement (including without limitation, any broker or finder,
         creditor or other person), and this Agreement shall be effective only
         as between the Parties hereto, their successors and permitted assigns.

10.3     FURTHER ACTIONS: PURCHASER and SELLER agree that each will, from time
         to time and upon reasonable request, execute, acknowledge and deliver,
         or cause to be executed, acknowledged and delivered by its Affiliates,
         such instruments, and take such other action as may be necessary, or
         advisable, to carry out


                                    Page 58
<PAGE>   64


         PURCHASER's and SELLER's obligations under this Agreement. Further,
         PURCHASER and SELLER agree as follows:

                    (i)    Except for the assets of SOSCO to be addressed by
                           Exhibit "6" hereof, to the extent that there are
                           assets of SELLER's Affiliates located on the Oil &
                           Gas Interests, the locations of which will be
                           disclosed in writing to PURCHASER, but for which a
                           lease of platform space is not currently in place, or
                           has not been negotiated, PURCHASER and such
                           Affiliates shall negotiate in good faith such leases
                           as are appropriate containing provisions consistent
                           with industry customs and rental fees of $150.00 per
                           square foot per year for equipment and facilities,
                           and $25.00 per square foot per year for platform
                           risers. For the period between the Effective Time and
                           the execution of any such leases, PURCHASER agrees
                           that such Affiliates shall have, and PURCHASER hereby
                           grants, a lease of platform space with respect to the
                           applicable Oil & Gas Interests limited to such areas
                           as are necessary for the maintenance, repair and
                           operation of the Affiliates' equipment, the rentals
                           due under such leases being as specified above; and

                    (ii)   The Parties acknowledge that the Exhibits and
                           Schedules are subject to modification, revision,
                           deletion and addition by SELLER up to and including
                           May 12, 1999, at which time SELLER shall present a
                           complete set of the Exhibits and Schedules to
                           PURCHASER, and that upon PURCHASER's certification
                           pursuant to Section 5.1.3, SELLER's representations
                           and warranties in Section 6.2 shall be effective as
                           of the date of such certification of such modified
                           Exhibits and Schedules; and


                                    Page 59
<PAGE>   65


                    (iii)  To the extent that either PURCHASER or SELLER
                           requires a production handling agreement contract as
                           a result of the assignment from SELLER to PURCHASER
                           of an interest in a Lease pursuant to this Agreement,
                           the parties shall negotiate in good faith such
                           production handling agreements as are appropriate
                           containing provisions consistent with industry custom
                           and provides for a maximum rate of $.10 per mcf,
                           $1.00 per bbl of oil and $.50 per bbl of water.

10.4     NOTICES: Any notice provided or permitted to be given under this
         Agreement shall be in writing, and may be sent by personal delivery,
         facsimile machine or by depositing same in the United States Mail,
         addressed to the Party to be notified, postage prepaid, and registered
         or certified with a return receipt requested. Notices deposited in the
         mail in the manner hereinabove described shall be deemed to have been
         given and received upon the date of delivery as shown on the return
         receipt (or upon the date of attempted delivery where delivery is
         refused). Notice served in any other manner shall be deemed to have
         been given and received only if and when actually received by the
         addressee (confirmation of such receipt by confirmed facsimile
         transmission being deemed receipt of communications sent by telecopy or
         other facsimile means), and when delivered and receipted for, if
         hand-delivered, sent by express courier or delivery service. For
         purposes of notice, the addresses of the Parties shall be as follows:


                                    Page 60
<PAGE>   66


         EXPRESS MAIL                    REGULAR MAIL
         ------------                    ------------

                           SELLER
                           ------

         Shell Offshore Inc.             Shell Offshore Inc.
         ATTN: Contracts Manager         ATTN: Contracts Manager
         701 Poydras Street              P. O. Box 61933
         New Orleans, LA 70139           New Orleans, LA 70161

                    Telephone -  (504) 728-6704
                    Facsimile -  (504) 728-0678



                           PURCHASER
                           ---------

         Apache Corporation
         ATTN:      Lisa A. Floyd
                    Vice President - Business Development
                    2000 Post Oak Boulevard, Suite 100
                    Houston, Texas 77056-4400

                    Telephone - (713) 296-6569
                    Facsimile   - (713) 296-6459


         or at such other address and number as either Party shall have
         previously designated by written notice given to the other Party in the
         manner hereinabove set forth.

10.5     PUBLIC ANNOUNCEMENTS: The Parties agree that prior to making any public
         announcement or statement with respect to the transaction contemplated
         by this Agreement, the Party desiring to make such public announcement
         or statement shall obtain the written approval of the other Party to
         the text of such announcement or statement, which approval may not be
         unreasonably withheld. Nothing contained


                                    Page 61
<PAGE>   67


         in this Section shall be construed to require either Party to obtain
         approval of the other Party to disclose information with respect to the
         transaction contemplated by this Agreement to any state or federal
         Governmental Body, to the extent required by applicable law or by any
         applicable rules, regulations or orders of any Governmental Body having
         jurisdiction, or necessary to comply with disclosure requirements of
         applicable securities laws or any applicable stock exchanges.

10.6     TIME LIMITS: Time is of the essence in this Agreement and all time
         limits shall be strictly construed and enforced. The failure or delay
         of any Party in the enforcement of the rights granted under this
         Agreement shall not constitute a waiver of said rights nor shall it be
         considered as a basis for estoppel. Except as otherwise limited by the
         time limits contained in this Agreement, such Party may exercise its
         rights under this Agreement despite any delay or failure to enforce the
         rights when the right or obligation arose.

10.7     COMPLIANCE WITH LAWS & REGULATIONS: This Agreement, and all operations
         conducted by the Parties pursuant to this Agreement, are expressly
         subject to and shall comply with all laws, orders, rules and
         regulations of any federal, state or local Governmental Body having
         jurisdiction. No Party shall suffer a forfeiture or be liable in
         damages for failure to comply with any of the provisions of this
         Agreement if such compliance is prevented or if such failure results
         from compliance with any applicable law, order, rule or regulation.

10.8     APPLICABLE LAW: The provisions of this Agreement and the relationship
         of the Parties shall be governed and interpreted according to the laws
         of the State of Louisiana without giving effect to principles of
         conflicts of laws.


                                    Page 62
<PAGE>   68


         10.8.1     DTPA WAIVER:

                    (i) PURCHASER HEREBY REPRESENTS AND ACKNOWLEDGES THAT IT IS
                    A "BUSINESS CONSUMER" FOR THE PURPOSES OF THE TEXAS
                    DECEPTIVE TRADE PRACTICES-CONSUMER PROTECTION ACT
                    (SUBCHAPTER E OF CHAPTER 17 OF THE TEXAS BUSINESS AND
                    COMMERCE CODE (THE "TEXAS DTPA")), THAT IT HAS ASSETS OF
                    $5,000,000 OR MORE ACCORDING TO ITS MOST RECENT FINANCIAL
                    STATEMENTS PREPARED IN ACCORDANCE WITH GENERALLY ACCEPTED
                    ACCOUNTING PRINCIPLES, THAT IS HAS KNOWLEDGE AND EXPERIENCE
                    IN FINANCIAL AND BUSINESS MATTERS THAT ENABLE IT TO EVALUATE
                    THE MERITS AND RISKS OF THE TRANSACTIONS CONTEMPLATED BY
                    THIS AGREEMENT, THAT IT HAS BEEN REPRESENTED BY LEGAL
                    COUNSEL OF ITS CHOICE IN ENTERING INTO THIS AGREEMENT AND
                    THE TRANSACTIONS CONTEMPLATED HEREBY AND THEREBY, AND THAT
                    IT IS NOT IN A SIGNIFICANTLY DISPARATE BARGAINING POSITION
                    WITH RESPECT TO THE PARTIES TO AND THE TRANSACTIONS
                    CONTEMPLATED BY THIS AGREEMENT. PURCHASER HEREBY WAIVES THE
                    PROVISIONS OF THE TEXAS DECEPTIVE TRADE PRACTICES-CONSUMER
                    PROTECTION ACT (OTHER THAN SECTION 17.555 THEREOF), AS FROM
                    TIME TO TIME AMENDED.

                    (ii) PURCHASER expressly recognizes that the price for which
                    SELLER has agreed to perform its obligations under this
                    Agreement has been predicated upon the inapplicability of
                    the Texas DTPA and this waiver thereof. PURCHASER further
                    recognizes that SELLER, in determining to proceed with the
                    entering into of this Agreement, has expressly relied on
                    this waiver and the inapplicability of the Texas DTPA.


                                    Page 63
<PAGE>   69


10.9     ARBITRATION: Any controversy or claim ("Claim"), whether based on
         contract, tort, statute or other legal or equitable theory arising out
         of or related to the breach of one or more of the warranties and
         representations made in this Agreement, or as a result of any other
         matters which may give rise to a liability with respect to this
         Agreement, shall be settled by arbitration in accordance with the
         Commercial Arbitration Rules of the American Arbitration Association
         (the "Rules"), and this provision. The arbitration shall be governed by
         the United States Arbitration Act, 9 U.S.C 1-16, to the exclusion of
         any provision of state law inconsistent therewith or which would
         produce a different result, and judgment upon the award rendered by the
         arbitrator may be entered by any court having jurisdiction.

         Either SELLER or PURCHASER may initiate arbitration by giving written
         notice to the other. Arbitration will be deemed to be initiated when
         written notice, properly addressed and stamped, is deposited with the
         United States Postal Service. The party initiating arbitration shall
         nominate one (1) arbitrator at the same time it initiates arbitration.
         The other party shall nominate one (1) arbitrator within thirty (30)
         calendar days of receiving the notice of arbitration, failing which the
         initiating party, on behalf of and on written notice to the other
         party, may request appointment of the second arbitrator by the American
         Arbitration Association ("AAA") office in Houston, Texas in accordance
         with the Rules. The two arbitrators shall appoint a third, neutral
         arbitrator. The third, neutral arbitrator shall be competent and
         experienced in matters involving the oil and gas business in the Gulf
         of Mexico and shall be unaffiliated and without prior financial
         alliances with either party, or either of the other arbitrators.

         If the two arbitrators are unable to agree on a third arbitrator within
         sixty (60) calendar days from initiation of arbitration, then a third
         arbitrator shall be selected by the AAA office in Houston, Texas, with
         due regard given to the selection criteria above and input from the
         parties and other arbitrators. The AAA shall select the


                                    Page 64
<PAGE>   70


         third arbitrator not later than ninety (90) calendar days from
         initiation of arbitration. Costs charged by AAA for selecting the third
         arbitrator shall be borne equally by SELLER and PURCHASER.

         In the event AAA should fail to select the third arbitrator within
         ninety (90) calendar days from initiation of arbitration, then either
         party may petition the Chief United States District Judge for the
         Eastern District of Louisiana to select the third arbitrator. Due
         regard shall be given to the selection criteria above and input from
         the parties and other arbitrators.

         The arbitrators shall determine the Claims of the Parties and render a
         final award in accordance with the substantive law of the State of
         Louisiana, excluding the conflicts provisions of such law. The
         arbitrators shall set forth the reasons for the award in writing. All
         statutes of limitations and defenses based upon passage of time
         applicable to any Claim (including any counterclaim or setoff) shall be
         interrupted by the filing of the arbitration and suspended while the
         arbitration is pending.

         The obligation to arbitrate any Claim shall extend to the successors,
         assigns and third party beneficiaries of the Parties. The Parties shall
         use their best efforts to cause the obligation to arbitrate any Claim
         to extend to any officer, director, employee, shareholder, agent,
         trustee, affiliate, or subsidiary. The terms hereof shall not limit any
         obligations of a Party to defend, indemnify, or hold harmless another
         Party against court proceedings or other Claims, losses, damages or
         expenses.


                                    Page 65
<PAGE>   71


         The arbitrators shall order the Parties to promptly exchange copies of
         all exhibits and witness lists, and, if requested by a Party, to
         produce other relevant documents, to answer interrogatories, to respond
         to requests for admissions (which shall be deemed admitted if not
         denied) and to produce for deposition and, if requested, at the hearing
         all witnesses that such Party has listed and all other persons within
         such Party's control. Any additional discovery shall only occur by
         agreement of the Parties or as ordered by the arbitrator upon finding
         good cause.

         The three arbitrators so selected shall conduct a hearing in New
         Orleans, Louisiana not later than ninety (90) days following the date
         the third arbitrator is selected, at which the parties shall present
         such evidence and witnesses as they may choose, with or without
         counsel. Adherence to formal rules of evidence shall not be required,
         but the arbitrators shall consider any evidence and testimony that they
         determine to be relevant, in accordance with procedures that they
         determine to be appropriate. The arbitrators shall render a written
         decision within twenty (20) days following conclusion of the hearing.

         Each Party shall bear its own costs, expenses and attorney's fees;
         provided that if court proceedings to stay litigation or compel
         arbitration are necessary, the Party who unsuccessfully opposes such
         proceedings shall pay all reasonable associated costs, expenses, and
         attorney's fees in connection with such court proceeding; provided
         further, that any costs incurred by a party in seeking judicial
         enforcement of any decision rendered in writing by the arbitrators, or
         a majority of the arbitrators, shall be chargeable to and borne
         exclusively by the Party against whom such court order is obtained.

         In order to prevent irreparable harm, the arbitrator shall have the
         power to grant temporary or permanent injunctive or other equitable
         relief. Prior to the


                                    Page 66
<PAGE>   72


         appointment of an arbitrator a Party may, notwithstanding any other
         provision of this Agreement, seek temporary injunctive relief from any
         court of competent jurisdiction; provided that the Party seeking such
         relief shall (if arbitration has not already been commenced)
         simultaneously commence arbitration. Such court ordered relief shall
         not continue more than 10 days after the appointment of the arbitrator
         and in no event for longer than 60 days.

         Each Party shall bear the cost of the arbitrator selected by the party
         and the cost of the third arbitrator shall be shared equally by both
         PURCHASER and SELLER.


10.10    SEVERANCE OF INVALID PROVISIONS: In case of a conflict between the
         provisions of this Agreement and the provisions of any applicable laws
         or regulations, the provisions of the laws or regulations shall govern
         over the provisions of this Agreement. If, for any reason and for so
         long as, any clause or provision of this Agreement is held by a court
         of competent jurisdiction to be illegal, invalid, unenforceable or
         unconscionable under any present or future law (or interpretation
         thereof), the remainder of this Agreement shall not be affected by such
         illegality or invalidity. Any such invalid provision shall be deemed
         severed from this Agreement as if this Agreement had been executed with
         the invalid provision eliminated.


10.11    CONSTRUCTION & INTERPRETATION: The interpretation and construction of
         the terms of this Agreement will be governed by the following
         conventions:

         10.11.1    HEADINGS FOR CONVENIENCE: Except for the definition
                    headings, all the table of contents, captions, numbering
                    sequences, paragraph headings and punctuation used in this
                    Agreement are inserted for convenience only and shall in no
                    way define, limit or describe the scope or intent of this


                                    Page 67
<PAGE>   73


                    Agreement or any part thereof, nor have any legal effect
                    other than to aid a reasonable interpretation of this
                    Agreement.

         10.11.2    GENDER & NUMBER: The use of pronouns in whatever gender or
                    number shall be deemed to be a proper reference to the
                    Parties to this Agreement though the Parties may be
                    individuals, business entities or groups thereof. Any
                    necessary grammatical changes required to make the
                    provisions of this Agreement refer to the correct gender or
                    number shall in all instances be assumed as though each case
                    was fully expressed.

         10.11.3    INDEPENDENT REPRESENTATION: Each Party has had the benefit
                    of independent representation with respect to the subject
                    matter of this Agreement. This Agreement, though drawn by
                    one Party, shall be construed fairly and reasonably and not
                    more strictly against one Party than another.

10.12    INTEGRATED AGREEMENT: This Agreement, and the Exhibits and Schedules
         attached and incorporated herein, and the instruments delivered at or
         in connection with the Closing hereunder ("Closing Documents") contains
         the final and entire agreement of the Parties with respect to the
         subject matter of this contract. There are no representations,
         warranties or promises, oral or written, between the Parties other than
         those included in this Agreement or in any Closing Document. Upon
         execution of this Agreement by all Parties, this Agreement shall
         supersede and replace all previous negotiations, understandings or
         promises, whether written or oral, relative to the subject of this
         Agreement. Each of the Parties acknowledges that no other Party has
         made any promise, representation or warranty that is not expressly
         stated in this Agreement or in any Closing Document. This Agreement
         shall not be


                                    Page 68
<PAGE>   74


         modified or changed (nor any provision of this Agreement waived) except
         by a written amendment signed by all the Parties. This Agreement is
         entire as to all the performances to be rendered under it, and breach
         of any provision shall constitute a breach of the entire Agreement. A
         waiver of any breach or failure to enforce any of the terms or
         conditions of this Agreement shall not in any way affect, limit or
         waive a Party's rights under this Agreement at any time to enforce
         strict compliance thereafter with every term or condition of this
         Agreement.

10.13    BINDING EFFECT: This Agreement shall be binding upon and inure to the
         benefit of the Parties and their respective successors and assigns.

10.14    MULTIPLE COUNTERPARTS: This Agreement may be executed by signing the
         original or a counterpart hereof. If this Agreement is executed in
         multiple counterparts, each counterpart shall be deemed an original,
         and all of which when taken together shall constitute but one and the
         same agreement with the same effect as if all Parties had signed the
         same instrument.

10.15    FAIR NOTICE DISCLOSURE STATEMENT: PURCHASER'S ATTENTION IS DIRECTED TO
         CERTAIN PROVISIONS OF THIS AGREEMENT WHICH REQUIRE PURCHASER TO DEFEND,
         INDEMNIFY AND HOLD SELLER HARMLESS IRRESPECTIVE OF THE STRICT LIABILITY
         OF SELLER OR THE SOLE, JOINT OR CONCURRENT, ACTIVE OR PASSIVE,
         NEGLIGENCE OF SELLER, AND IN SOME CASES THE GROSS NEGLIGENCE OR WILLFUL
         MISCONDUCT OF SELLER.

10.16    GAS BALANCING: Producer and field imbalances will be addressed in the
         closing statement and the Final Accounting as set forth in Sections 7.1
         et seq. Specifically, PURCHASER and SELLER agree that the producer and
         field imbalances will be settled between the Parties pursuant to the
         aforementioned sections on the basis of $1.95 per mcf of gas and $14.00
         per barrel of oil. As to producer and field


                                    Page 69
<PAGE>   75


         imbalances, PURCHASER shall assume the rights and obligations of SELLER
         in and to such imbalances as of the Effective Time, and release,
         indemnify, and hold harmless SELLER in connection therewith.

         IN WITNESS WHEREOF, the Parties have executed the Agreement as of the
date first above written.

WITNESSES (AS TO ALL OF SELLER'S SIGNATURES):


                                          SHELL OFFSHORE INC.

/s/ John J. Christmann, IV                By: /s/ K. R. Sissell
- ----------------------------                 -----------------------------------
                                                  K. R. Sissell
                                                  Agent & Attorney-in-Fact
/s/ Marjorie Lofthouse
- ----------------------------

                                          MIDSTREAM CAPITAL CORPORATION

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Attorney-in-Fact
                                              for Shell Exploration & Production
                                              Company, as Agent for Midstream
                                              Capital Corporation


                                          SHELL OIL & GAS INVESTMENT
                                           LIMITED PARTNERSHIP

                                          By:  SHELL OFFSHORE INC.,
                                               Its General Partner

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact


                                    Page 70
<PAGE>   76


                                          SHELL ONSHORE VENTURES INC.

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact



                                          SHELL DEEPWATER DEVELOPMENT
                                             HOLDINGS INC.

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact


                                          SHELL FRONTIER OIL & GAS INC.

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact



                                          SOI FINANCE INC.

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact


                                          ORLANDO-SOI PARTNERSHIP

                                          By:  SHELL OFFSHORE INC.,
                                               Its General Partner

                                          By: /s/ K. R. Sissell
                                             -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact


                                    Page 71
<PAGE>   77


                                        SHELL CONSOLIDATED ENERGY
                                          RESOURCES INC.

                                        By: /s/ K. R. Sissell
                                           -----------------------------------
                                              K. R. Sissell
                                              Agent & Attorney-in-Fact


WITNESSES:

                                        APACHE CORPORATION

/s/ John J. Christmann, IV              By: /s/ Lisa A. Floyd
- ------------------------------             -----------------------------------
                                           Lisa A. Floyd
                                           Vice President - Business Development

/s/ Marjorie Lofthouse
- ------------------------------


                                    Page 72
<PAGE>   78


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Offshore Inc., a Delaware corporation, on the day and year therein
mentioned and as the act and deed of said corporation, for the purpose and
consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public
My Commission is for life.


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Attorney-in-Fact for Shell
Exploration & Production Company, as Agent for Midstream Capital Corporation, a
Delaware corporation, on the day and year therein mentioned and as the act and
deed of said corporation, for the purpose and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public
My Commission is for life.


                                    Page 73
<PAGE>   79


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Offshore Inc., the General Partner of Shell Oil & Gas Investment Limited
Partnership, a Delaware partnership, on the day and year therein mentioned and
as the act and deed of said partnership, for the purpose and consideration
therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Onshore Ventures Inc., a Delaware corporation, on the day and year therein
mentioned and as the act and deed of said corporation, for the purpose and
consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.

STATE OF LOUISIANA
PARISH OF ORLEANS


                                    Page 74
<PAGE>   80


         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Deepwater Development Holdings Inc., a Delaware corporation, on the day
and year therein mentioned and as the act and deed of said corporation, for the
purpose and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Frontier Oil & Gas Inc., a Delaware corporation, on the day and year
therein mentioned and as the act and deed of said corporation, for the purpose
and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


                                    Page 75
<PAGE>   81


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for SOI
Finance Inc., a Delaware corporation, on the day and year therein mentioned and
as the act and deed of said corporation, for the purpose and consideration
therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Offshore Inc., the General Partner of Orlando-SOI Partnership, a Delaware
partnership, on the day and year therein mentioned and as the act and deed of
said partnership, for the purpose and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


                                    Page 76
<PAGE>   82


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared K. R. SISSELL, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Agent and Attorney-in-Fact for
Shell Consolidated Energy Resources Inc., a Delaware corporation, on the day and
year therein mentioned and as the act and deed of said corporation, for the
purpose and consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.


STATE OF LOUISIANA
PARISH OF ORLEANS

         BEFORE ME, the undersigned Notary Public, on this day personally
appeared Lisa A. Floyd, known to me to be the person whose name is subscribed to
the foregoing instrument and acknowledged to me that he, being fully authorized
to do so, executed and delivered the same as Vice President-Business Development
for Apache Corporation, a Delaware corporation, on the day and year therein
mentioned and as the act and deed of said corporation, for the purpose and
consideration therein expressed.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this 29th day of April, 1999.

                                                  /s/ Jonathan Hunter
                                                  -----------------------------
                                                  Notary Public

My Commission is for life.



                                    Page 77


<PAGE>   1
                                                                     EXHIBIT 2.2


                            STOCK PURCHASE AGREEMENT


         THIS STOCK PURCHASE AGREEMENT ("Agreement") is dated April 29, 1999 by
and between SHELL OFFSHORE INC., a Delaware corporation ("Shell") having a post
office address of P.O. Box 61933, New Orleans, Louisiana 70161, and APACHE
CORPORATION, a Delaware corporation ("Apache"), the address for which is 2000
Post Oak Boulevard, Suite 100, Houston, Texas 77056-4400. Shell and Apache are
sometimes separately referred to as a "Party" and are sometimes collectively
referred to as "Parties."

         WHEREAS, the Parties and certain affiliates of Shell (collectively, the
"Shall Entities") have entered into an Asset Purchase Agreement dated even
herewith for the sale by the Shell Entities and purchase by Apache of certain
oil and gas properties (the "Asset Purchase Agreement"); and

         WHEREAS, as a portion of the consideration to be paid by Apache
pursuant to the Asset Purchase Agreement, Shell has agreed to acquire and Apache
has agreed to issue shares of common stock of Apache;

         NOW, THEREFORE, in consideration of the mutual promises contained
herein and in the Asset Purchase Agreement, the benefits to be derived by each
Party hereunder and thereunder, and other good and valuable consideration, the
Parties agree as follows:

SECTION 1 - DEFINITIONS

All capitalized terms used herein and not otherwise defined have the meanings
set forth in the Asset Purchase Agreement.

SECTION 2 - PURCHASE AND SALE OF THE SHARES

2.1      PURCHASE AND SALE OF THE SHARES: On the terms and subject to the
         conditions of the Asset Purchase Agreement and this Agreement, at the
         Closing, Apache shall issue and sell to Shell 1,000,000 shares (the
         "Shares") of the common stock, par value $1.25 per share, of Apache
         ("Apache Common Stock") and Shell shall acquire and purchase the Shares
         from Apache.

2.2      CONSIDERATION FOR THE SHARES: The Shares are being issued in connection
         with and as part of the consideration for the acquisition by Apache of
         certain oil and gas properties from Shell pursuant to the Asset
         Purchase Agreement.

2.3      SHARE CERTIFICATE: Apache shall deliver to Shell at the Closing a stock
         certificate representing the Shares in appropriate form.
<PAGE>   2
SECTION 3 - REPRESENTATIONS AND WARRANTIES OF SHELL

Shell hereby represents and warrants to Apache as of the date hereof and as of
the Closing that:

3.1      Shell is acquiring the Shares for its own account and not as a nominee
         or agent or otherwise for any other person.

3.2      Shell is acquiring the Shares for investment purposes and not with a
         view to, or for resale in connection with, any distribution any of the
         Shares in violation of the Securities Act of 1933, as amended.

3.3      Shell has such knowledge, sophistication and experience in business,
         tax and financial matters that Shell is capable of evaluating and is
         familiar with the merits and risks of an investment in the Shares, can
         bear substantial economic risk of an investment in the Shares for an
         indefinite period of time and can afford a complete loss of such
         investment.

3.4      Shell has received from Apache, and has had the opportunity to review,
         the following documents concerning Apache:

         (i)      Prospectus dated September 21, 1995 relating to 1,350,000
                  shares of Apache Common Stock registered pursuant to a
                  registration statement described in Section 4.1 below,

         (ii)     Prospectus supplement dated April 26, 1999,

         (iii)    Annual Report on Form 10-K for the year ended December 31,
                  1998,

         (iv)     Current Report on Form 8-K dated March 2, 1999 (as amended by
                  Amendment No. 1 on Form 8-K/A filed on March 5, 1999), and

         (v)      Proxy Statement for annual meeting of stockholders to be held
                  on May 6, 1999.

         Shell acknowledges that certain information conveyed to it under item
         (ii) above contains material nonpublic information concerning Apache
         and that the federal securities laws prohibit trading in securities
         while in possession of material nonpublic information, and Shell agrees
         to maintain the confidentiality of such information.

3.5      Shell acknowledges that (i) none of Apache, any affiliate thereof or
         any person representing Apache or any affiliate thereof has made any
         representation to it with respect to Apache or the offering or sale of
         the Shares, other than the information concerning Apache and the
         offering contained in the documents set forth in Section 3.4 or the
         Asset Purchase Agreement, (ii) in making its investment decision Shell
         is not relying upon any information given by Apache or any affiliate
         thereof or any person representing Apache or any affiliate thereof
         other than the information concerning Apache and the offering contained
         in the documents set forth in Section 3.4 and the Asset Purchase
         Agreement and (iii) no representation has been made, and no information
         has been furnished, to Shell in connection with the offering or sale of
         the Shares that was in any way inconsistent with any other information
         with which Shell has been provided.


                                        2
<PAGE>   3
3.6      Shell understands the Apache is relying upon the representations and
         warranties contained in this Agreement for purposes of determining
         whether it is appropriate to issue the Shares to Shell.

3.7      Shell is a corporation duly organized, validly existing and in good
         standing under the laws of the State of Delaware. Shell has full power
         and authority to enter into this Agreement and consummate the
         transactions contemplated by this Agreement. This Agreement has been
         duly and validly authorized, executed and delivered on behalf of Shell
         and is a valid and binding agreement of Shell enforceable in accordance
         with its terms, subject as to enforceability to general principles of
         equity and to bankruptcy or other laws affecting the enforcement of
         creditors' rights generally.

SECTION 4 - REPRESENTATIONS AND WARRANTIES OF APACHE

Apache hereby represents and warrants to Shell as of the date hereof and as of
the Closing that:

4.1      Apache has prepared and filed with the Securities and Exchange
         Commission ("Commission") a registration statement on Form S-4 (No.
         33-61669) that covers the registration of the Shares under the
         Securities Act of 1933, as amended ("Securities Act"), and the sale of
         the Shares pursuant to the Asset Purchase Agreement and this Agreement
         in accordance with Rule 415 of the rules and regulations of the
         Commission under the Securities Act, and has prepared and filed such
         amendments thereto as may have been required to the date hereof. Such
         registration statement, as amended, has been declared effective by the
         Commission, and no stop order suspending the effectiveness of the
         registration statement has been issued by the Commission.

4.2      The Shares have been duly and validly authorized for issuance, offer
         and sale pursuant to this Agreement. The Shares, when issued and
         delivered against payment of the consideration therefor in accordance
         with this Agreement and the Asset Purchase Agreement, will be validly
         issued, fully paid and non-assessable shares of Apache Common Stock.

4.3      On or prior to the date of the Closing, the Shares will have been
         listed for trading on the New York Stock Exchange and the Chicago Stock
         Exchange.

4.4      Apache is a corporation duly organized, validly existing and in good
         standing under the laws of the State of Delaware. Apache has full power
         and authority to enter into this Agreement and consummate the
         transactions contemplated by this Agreement. This Agreement has been
         duly and validly authorized, executed and delivered on behalf of Apache
         and is a valid and binding agreement of Apache enforceable in
         accordance with its terms, subject as to enforceability to general
         principles of equity and to bankruptcy or other laws affecting the
         enforcement of creditors' rights generally.


                                       3
<PAGE>   4
SECTION 5 - TRANSFER RESTRICTIONS AND RESALES

5.1      NINETY DAY HOLDING PERIOD: In addition to any restrictions that might
         apply as set forth in other subsections of this Section, Shell agrees
         that during a period of ninety days from the date of this Agreement it
         will not, directly or indirectly, (i) offer, pledge, sell, contract to
         sell, sell any option or contract to purchase, purchase any option or
         contract to sell, grant any option, right or warrant for the sale of,
         or otherwise dispose of or transfer any of the Shares or (ii) enter
         into any swap or any other agreement or transaction that transfers, in
         whole or in part, directly or indirectly, the economic consequence of
         ownership of the Shares, whether any such swap or other transaction is
         to be settled by delivery of the Shares or other securities, in cash or
         otherwise (collectively, the "lock-up"); provided, however, that Apache
         agrees that (x) Apache will, after the date of this Agreement, consult
         with Goldman, Sachs & Co. ("Goldman") on an on-going basis concerning
         the continued need for the lock-up provided for in this subsection and
         (y) promptly following Apache's receipt of advice from Goldman that
         such lock-up is no longer required in connection with Apache's planned
         underwritten public offering of equity securities, Apache will give
         Shell notice that the restrictions set forth in this subsection are
         terminated and such restrictions shall cease.

5.2      RESALES: Shell acknowledges that since it and its affiliates may be
         deemed to be "affiliates" for purposes of Rule 145 promulgated under
         the Securities Act at the time the Shares are issued, such Shares can
         be sold only (i) pursuant to an effective registration statement under
         the Securities Act, (ii) in conformity with the volume, manner of sale
         and other limitations of Rule 145(d) promulgated under the Securities
         Act, or (iii) in reliance upon an exemption from registration that is
         available under the Securities Act.

         Shell also acknowledges and agrees that stop-transfer instructions will
         be given to Apache's transfer agent with respect to the Shares and that
         there will be placed on the certificates representing such Shares, or
         any substitutions therefor, a legend stating in substance as follows:

                  "These shares were issued in a transaction to which Rule 145
                  promulgated under the Securities Act of 1933, as amended (the
                  "Securities Act"), applies. These shares may only be
                  transferred in accordance with the terms of such Rule or as
                  otherwise provided under the Securities Act."

         It is understood and agreed that the legend set forth above shall be
         removed, upon surrender of certificates bearing such legend, by
         delivery of substitute certificates without such legend if Shell shall
         have satisfied Apache that the sale or disposition of the shares
         represented by the surrendered certificates may be effected without
         registration of the offering, sale and delivery of such shares under
         the Securities Act.

SECTION 6 - CONDITIONS PRECEDENT

The Parties' obligations pursuant to this Agreement shall be subject to the
occurrence of the Closing pursuant to the Asset Purchase Agreement, and if the
Asset Purchase Agreement is terminated without the Closing being consummated,
then this Agreement shall terminate simultaneously therewith and be void and of
no further force or effect.


                                       4
<PAGE>   5
SECTION 7 - ADMINISTRATIVE PROVISIONS

7.1      PROVISIONS INCORPORATED BY REFERENCE: The following provisions of the
         Asset Purchase Agreement are incorporated by reference into this
         Agreement and shall apply to this Agreement as if set forth in full
         herein; provided that each reference to "PURCHASER" and "SELLER"
         therein shall become a reference to "Apache" and "Shell," respectively,
         herein: Sections 10.1 through 10.7, Sections 10.9, 10.10, 10.11, 10.13
         and 10.14.

7.2      GOVERNING LAW: This Agreement shall be governed and interpreted
         according to the laws of the State of Texas without giving effect to
         principles of conflicts of laws.

                            [signature page follows]


                                       5
<PAGE>   6
IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date
first above written.


                                           APACHE CORPORATION

                                           By:  /s/ Lisa A. Floyd
                                              -------------------------------
                                           Name:    Lisa A. Floyd
                                           Title:   VP Business Development


                                           Shell Offshore Inc.

                                           By:  /s/ K. R. Sissell
                                              -------------------------------
                                           Name:    K. R. Sissell
                                           Title:   Attorney-in-Fact


                                       6


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