SEAGULL ENERGY CORP
8-K, 1998-12-01
NATURAL GAS TRANSMISISON & DISTRIBUTION
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================================================================================


                       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): NOVEMBER 24, 1998

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

                           SEAGULL ENERGY CORPORATION
             (Exact name of registrant as specified in its charter)


                 TEXAS                        1-8094             74-1764876
      (State or other jurisdiction       (Commission File     (I.R.S. Employer
   of incorporation or organization)         Number)         Identification No.)

        1001 FANNIN, SUITE 1700
             HOUSTON, TEXAS                                      77002-6714
(Address of principal executive offices)                         (Zip code)

       Registrant's telephone number, including area code: (713) 951-4700


================================================================================

<PAGE>   2

ITEM 5.  OTHER EVENTS

         On November 24, 1998, Seagull Energy Corporation, a Texas corporation
(the "Company"), entered into an Agreement and Plan of Merger (the "Merger
Agreement") with Ocean Energy, Inc., a Delaware corporation ("Ocean"). Pursuant
to the Merger, Ocean would merge with and into the Company (the "Merger"), which
will survive the Merger and be renamed Ocean Energy, Inc. Upon consummation of
the Merger, each current shareholder of Ocean will receive one share of common
stock of the Company. All issued and outstanding shares of common stock of the
Company will remain outstanding.

         In connection with the transactions contemplated by the Merger 
Agreement, the Company entered into voting agreements with John B. Brock, 
James C. Flores and the Flores Family Limited Partnership under which such 
parties have agreed to vote in favor of the Merger (the "Company Voting 
Agreements"). Similarly, The Prudential Insurance Company of America, Barry J. 
Galt and James T. Hackett have entered into voting agreements with Ocean under 
which such parties have agreed to vote in favor of the Merger (the "Ocean 
Voting Agreements" and together with the Company Voting Agreements, the "Voting 
Agreements"). The Voting Agreements are filed herewith as Exhibits 99.2-99.7 
and incorporated herein by reference. To prevent the triggering of the 
Company's Amended and Restated Rights Agreement, dated as of December 12, 1997 
(the "Rights Agreement"), the Company amended its Rights Agreement to provide 
that Ocean would not be deemed an "Acquiring Person" under such agreement by 
virtue of the execution of the Ocean Voting Agreements. This amendment is 
filed herewith as Exhibit 4.1 and incorporated herein by reference.

         A more complete description of the Merger is contained in the November
25, 1998 press release by the Company, filed herewith as Exhibit 99.1 and
incorporated herein by reference. The Merger Agreement is filed herewith as
Exhibit 2.1 and incorporated herein by reference. 

ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

         (c)  Exhibits.

                2.1     Agreement and Plan of Merger, dated as of November 24,
                        1998, by and between the Company and Ocean.

                4.1     Amendment No. 1 to Amended and Restated Rights
                        Agreement, dated as of November 24, 1998, by and between
                        the Company and BankBoston, N.A.

               99.1     Press Release, dated November 25, 1998.

               99.2     Voting Agreement, dated as of November 24, 1998, by and
                        between John B. Brock and the Company.

               99.3     Voting Agreement, dated as of November 24, 1998, by and
                        between James C. Flores and the Company.

               99.4     Voting Agreement, dated as of November 24, 1998, by and
                        between the Flores Family Limited Partnership and the
                        Company.

               99.5     Voting Agreement, dated as of November 24, 1998, by and
                        between The Prudential Insurance Company of America and
                        Ocean.

               99.6     Voting Agreement, dated as of November 24, 1998, by and
                        between James T. Hackett and Ocean.

               99.7     Voting Agreement, dated as of November 24, 1998, by and
                        between Barry J. Galt and Ocean.


                                       -2-
<PAGE>   3






            [The remainder of this page is intentionally left blank.]







                                                      -3-

<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 hereunto duly authorized.

                                       SEAGULL ENERGY CORPORATION


                                       By: /s/ WILLIAM L. TRANSIER
                                          --------------------------------------
                                           William L. Transier
                                           Executive Vice President and
                                           Chief Financial Officer


Dated:  November 30, 1998








                                       -4-
<PAGE>   5


                                  EXHIBIT INDEX


     EXHIBIT NO.      DESCRIPTION 
     -----------      -----------
        2.1          Agreement and Plan of Merger, dated as of November 24,
                      1998, by and between the Company and Ocean.

        4.1          Amendment No. 1 to Amended and Restated Rights Agreement, 
                      dated as of November 24, 1998, by and between the Company 
                      and BankBoston, N.A.

       99.1          Press Release, dated November 25, 1998.

       99.2          Voting Agreement, dated as of November 24, 1998, by and
                      between John B. Brock and the Company.

       99.3          Voting Agreement, dated as of November 24, 1998, by and
                      between James C. Flores and the Company.

       99.4          Voting Agreement, dated as of November 24, 1998, by and
                      between the Flores Family Limited Partnership and the
                      Company.

       99.5          Voting Agreement, dated as of November 24, 1998, by and
                      between The Prudential Insurance Company of America and
                      Ocean.

       99.6          Voting Agreement, dated as of November 24, 1998, by and
                      between James T. Hackett and the Ocean.

       99.7          Voting Agreement, dated as of November 24, 1998, by and
                      between Barry J. Galt and the Ocean.


                                       -5-

<PAGE>   1
                                                                     EXHIBIT 2.1


                          AGREEMENT AND PLAN OF MERGER

                                     BETWEEN


                           SEAGULL ENERGY CORPORATION

                                       AND

                               OCEAN ENERGY, INC.







                          Dated as of November 24, 1998



<PAGE>   2
                                                                     

                                TABLE OF CONTENTS

                                    ARTICLE I

                                   THE MERGER

<TABLE>
<S>                                                                                            <C>
Section 1.1  The Merger.........................................................................1
Section 1.2  Effective Time of the Merger.......................................................1
Section 1.3  Tax Treatment......................................................................2
Section 1.4  Accounting Treatment...............................................................2

                                   ARTICLE II

                            THE SURVIVING CORPORATION

Section 2.1  Articles of Incorporation..........................................................2
Section 2.2  Bylaws.............................................................................2
Section 2.3  Directors and Officers.............................................................3

                                   ARTICLE III

                              CONVERSION OF SHARES

Section 3.1  Conversion of Capital Stock........................................................3
Section 3.2  Surrender and Payment..............................................................4
Section 3.3  Stock Options......................................................................6
Section 3.4  No Fractional Shares...............................................................7
Section 3.5  Closing............................................................................7

                                   ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF OEI

Section 4.1  Organization and Qualification.....................................................7
Section 4.2  Capitalization.....................................................................8
Section 4.3  Authority..........................................................................9
Section 4.4  Consents and Approvals; No Violation..............................................10
Section 4.5  OEI SEC Reports...................................................................11
Section 4.6  Financial Statements..............................................................11
Section 4.7  Absence of Undisclosed Liabilities................................................12
Section 4.8  Absence of Certain Changes........................................................12
Section 4.9  Taxes.............................................................................12
Section 4.10  Litigation.......................................................................13
Section 4.11  Employee Benefit Plans; ERISA....................................................13
</TABLE>

                                        i

<PAGE>   3
<TABLE>
<S>                                                                                            <C>
Section 4.12  Environmental Liability..........................................................14
Section 4.13  Compliance with Applicable Laws..................................................16
Section 4.14  Insurance........................................................................16
Section 4.15  Labor Matters; Employees.........................................................17
Section 4.16  Reserve Reports..................................................................17
Section 4.17  Permits..........................................................................18
Section 4.18  Material Contracts...............................................................18
Section 4.19  Required Stockholder Vote or Consent.............................................19
Section 4.20  Proxy Statement/Prospectus; Registration Statement...............................19
Section 4.21  Intellectual Property............................................................20
Section 4.22  Hedging..........................................................................20
Section 4.23  Brokers..........................................................................20
Section 4.24  Tax-Free Reorganization..........................................................21
Section 4.25  Fairness Opinion.................................................................21
Section 4.26  Year 2000 Issues.................................................................21
Section 4.27  Takeover Laws....................................................................21

                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES
                                   OF SEAGULL

Section 5.1  Organization and Qualification....................................................22
Section 5.2  Capitalization....................................................................23
Section 5.3  Authority.........................................................................23
Section 5.4  Consents and Approvals; No Violation..............................................24
Section 5.5  Seagull Financial Statements......................................................25
Section 5.6  Absence of Undisclosed Liabilities................................................25
Section 5.7  Absence of Certain Changes........................................................25
Section 5.8  Seagull SEC Reports...............................................................26
Section 5.9  Taxes.............................................................................26
Section 5.10  Litigation.......................................................................27
Section 5.11  Employee Benefit Plans; ERISA....................................................27
Section 5.12  Environmental Liability..........................................................28
Section 5.13  Compliance with Applicable Laws..................................................29
Section 5.14  Insurance........................................................................30
Section 5.15  Labor Matters....................................................................30
Section 5.16  Reserve Reports..................................................................31
Section 5.17  Material Contracts...............................................................31
Section 5.18  Permits..........................................................................32
Section 5.19  Required Stockholder Vote or Consent.............................................32
Section 5.20  Proxy Statement/Prospectus; Registration Statement...............................33
Section 5.21  Intellectual Property............................................................33
Section 5.22  Hedging..........................................................................33
Section 5.23  Brokers..........................................................................33
</TABLE>


                                       ii

<PAGE>   4
<TABLE>
<S>                                                                                            <C>
Section 5.24  Tax Matters......................................................................34
Section 5.25  Fairness Opinion.................................................................34
Section 5.26  Year 2000 Issues.................................................................34
Section 5.27  Regulation as a Utility..........................................................35
Section 5.28  Takeover Laws....................................................................35

                                   ARTICLE VI

                     CONDUCT OF BUSINESS PENDING THE MERGER

Section 6.1  Conduct of Business by OEI Pending the Merger.....................................35
Section 6.2  Conduct of Business by Seagull Pending the Merger.................................37

                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

Section 7.1  Access and Information............................................................40
Section 7.2  Acquisition Proposals.............................................................40
Section 7.3  Directors' and Officers' Indemnification and Insurance............................42
Section 7.4  Further Assurances................................................................42
Section 7.5  Expenses..........................................................................43
Section 7.6  Cooperation.......................................................................44
Section 7.7  Publicity.........................................................................44
Section 7.8  Additional Actions................................................................45
Section 7.9  Filings...........................................................................45
Section 7.10  Consents.........................................................................45
Section 7.11  Employee Matters; Benefit Plans..................................................45
Section 7.12  Board, Committees and Executive Officers.........................................46
Section 7.13  Stockholders Meetings............................................................48
Section 7.14  Preparation of the Proxy Statement/Prospectus
                and Registration Statement.....................................................49
Section 7.15  Stock Exchange Listing...........................................................50
Section 7.16  Notice of Certain Events.........................................................50
Section 7.17  Site Inspections.................................................................50
Section 7.18  Affiliate Agreements; Tax Treatment..............................................51
Section 7.19  Stockholder Litigation...........................................................51
Section 7.20  Indenture Matters................................................................51
Section 7.21  Credit Facility..................................................................51
Section 7.22  Seagull Rights Plan..............................................................51
Section 7.23  Registration Rights Agreements...................................................51
Section 7.24  Employment Agreements and Severance Agreements...................................52
</TABLE>



                                       iii

<PAGE>   5

                                  ARTICLE VIII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

<TABLE>
<S>                                                                                            <C>
Section 8.1  Conditions to the Obligation of Each Party........................................52
Section 8.2  Conditions to the Obligations of Seagull..........................................52
Section 8.3  Conditions to the Obligations of OEI..............................................53

                                   ARTICLE IX

                                    SURVIVAL

Section 9.1  Survival of Representations and Warranties........................................54
Section 9.2  Survival of Covenants and Agreements..............................................54

                                    ARTICLE X

                        TERMINATION, AMENDMENT AND WAIVER

Section 10.1  Termination......................................................................54
Section 10.2  Effect of Termination............................................................56

                                   ARTICLE XI

                                  MISCELLANEOUS

Section 11.1  Notices..........................................................................56
Section 11.2  Separability.....................................................................57
Section 11.3  Assignment.......................................................................57
Section 11.4  Interpretation...................................................................57
Section 11.5  Counterparts.....................................................................57
Section 11.6  Entire Agreement.................................................................58
Section 11.7  Governing Law....................................................................58
Section 11.8  Attorneys' Fees..................................................................58
Section 11.9  No Third Party Beneficiaries.....................................................58
Section 11.10  Disclosure Schedules............................................................58
Section 11.11  Amendments and Supplements......................................................58
Section 11.12  Extensions, Waivers, Etc........................................................58
</TABLE>


                                       iv
<PAGE>   6
                          AGREEMENT AND PLAN OF MERGER

         This Agreement and Plan of Merger (this "Agreement") dated as of
November 24, 1998, by and between Seagull Energy Corporation, a Texas
corporation ("Seagull"), and Ocean Energy, Inc., a Delaware corporation ("OEI").

         WHEREAS, the respective Boards of Directors of Seagull and OEI deem it
advisable and in the best interests of their respective stockholders that OEI
merge with and into Seagull (the "Merger") upon the terms and subject to the
conditions set forth herein, and such Boards of Directors have approved the
Merger; and

         WHEREAS, concurrently with the execution and delivery of this
Agreement, (i) Seagull has entered into voting agreements with each of John B.
Brock, James C. Flores and the Flores Family Limited Partnership under which
such parties have among other things agreed to support the Merger upon the terms
and conditions set forth therein and (ii) OEI has entered into voting agreements
with each of The Prudential Insurance Company of America, Barry J. Galt and
James T. Hackett under which such parties have among other things agreed to
support the Merger upon the terms and conditions set forth therein
(collectively, the "Voting Agreements"); and

         WHEREAS, for federal income tax purposes, it is intended that the
Merger will qualify as a reorganization under the provisions of Section 368(a)
of the United States Internal Revenue Code of 1986, as amended (the "Code");

         NOW, THEREFORE, in consideration of the premises and the
representations, warranties and agreements contained herein, the parties hereto
agree as follows:

                                    ARTICLE I

                                   THE MERGER

         Section 1.1 The Merger. Upon the terms and subject to the conditions
hereof, at the Effective Time (as defined in Section 1.2 hereof) OEI shall merge
with and into Seagull and the separate corporate existence of OEI shall
thereupon cease and Seagull shall be the surviving corporation in the Merger
(sometimes referred to herein as the "Surviving Corporation"). The Merger shall
have the effects set forth in Article 5.06 of the Texas Business Corporation Act
(the "TBCA") and Section 259 of the of the Delaware General Corporation Law (the
"DGCL"), including, without limitation, the Surviving Corporation's succession
to and assumption of all rights and obligations of OEI.

         Section 1.2 Effective Time of the Merger. The Merger shall become
effective (the "Effective Time") upon the later of (i) the filing of properly
executed Articles of Merger relating to the Merger with the Secretary of State
of the State of Texas in accordance with the TBCA, and the issuance by the
Secretary of State of the State of Texas of a certificate of merger with respect
thereto, (ii) the filing of a properly executed Certificate of Merger relating
to the Merger with the Secretary of State of the State of Delaware in accordance
with the DGCL, or (iii) at such later time as the parties shall agree and set
forth in such Articles of Merger and Certificate of Merger. The filing of the
Articles of Merger and the Certificate of Merger referred to above shall be made
as soon as practicable on the Closing Date set forth in Section 3.5.

                                        1

<PAGE>   7



         Section 1.3 Tax Treatment. It is intended that the Merger shall
constitute a reorganization under section 368(a) of the Code.

         Section 1.4 Accounting Treatment. It is intended that the Merger shall
be accounted for as a purchase transaction for financial accounting purposes.


                                   ARTICLE II

                            THE SURVIVING CORPORATION

         Section 2.1 Articles of Incorporation. The articles of incorporation of
Seagull in effect immediately prior to the Effective Time shall be the articles
of incorporation of the Surviving Corporation at and after the Effective Time
until thereafter amended in accordance with the terms thereof and the TBCA,
provided that, as of the Effective Time, such articles of incorporation shall be
amended as follows:

                  (a) Article ONE of such articles of incorporation shall be
amended to read in its entirety as follows:

                           "The name of the corporation is Ocean Energy, Inc."

                  (b) Article THREE of such articles of incorporation shall be
amended to read in its entirety as follows:

                           The purpose for which the corporation is organized is
                  to transact any and all lawful business for which corporations
                  may be incorporated under the Texas Business Corporation Act.

                  (c) The first paragraph of Article FOUR of such articles of
incorporation shall be amended to read in its entirety as follows:

                           The total number of shares of stock that the
                  corporation shall have authority to issue is 450,000,000
                  shares, divided into 50,000,000 shares of Preferred Stock of
                  the par value of $1.00 per share, and 400,000,000 shares of
                  Common Stock of the par value of $.10 per share. Each share of
                  Common Stock shall be entitled to one vote.

         Section 2.2 Bylaws. The bylaws of Seagull as in effect immediately
prior to the Effective Time shall be the bylaws of the Surviving Corporation at
and after the Effective Time, and thereafter may be amended in accordance with
their terms and as provided by the articles of incorporation of the Surviving
Corporation and the TBCA.


                                        2

<PAGE>   8
         Section 2.3 Directors and Officers. At and after the Effective Time,
the directors and officers of the Surviving Corporation shall be as set forth in
Section 7.12, until their respective successors have been duly elected or
appointed and qualified or until their earlier death, resignation or removal in
accordance with the Surviving Corporation's articles of incorporation and
bylaws.


                                   ARTICLE III

                              CONVERSION OF SHARES

         Section 3.1 Conversion of Capital Stock. As of the Effective Time, by
virtue of the Merger and without any action on the part of the holders of any
capital stock described below:

                  (a) Each share of the common stock, par value $.01 per share,
of OEI, including the associated preferred stock purchase rights (the "OEI
Common Stock") issued and outstanding immediately prior to the Effective Time
shall be converted into one share (the "Common Stock Exchange Ratio") of common
stock, par value $0.10 per share, of Seagull, including the associated preferred
share purchase rights (the "Seagull Common Stock"). All such OEI Common Stock,
when so converted, shall no longer be outstanding and shall automatically be
canceled and retired and shall cease to exist, and the holder of a certificate
("Common Stock Certificate") that, immediately prior to the Effective Time,
represented outstanding shares of OEI Common Stock shall cease to have any
rights with respect thereto, except the right to receive, upon the surrender of
such Common Stock Certificate, the Seagull Common Stock (the "Common Stock
Merger Consideration") to which such holder is entitled pursuant to this Section
3.1(a), without interest. Until surrendered as contemplated by this Section 3.1,
each Common Stock Certificate shall be deemed at any time after the Effective
Time to represent only the right to receive upon such surrender the Common Stock
Merger Consideration as contemplated by this Section 3.1. Notwithstanding the
foregoing, if between the date of this Agreement and the Effective Time the
outstanding shares of Seagull Common Stock or OEI Common Stock shall have been
changed into a different number of shares or a different class, by reason of any
stock dividend, subdivision, reclassification, recapitalization, split,
combination or exchange of shares, the Common Stock Exchange Ratio shall be
correspondingly adjusted to reflect such stock dividend, subdivision,
reclassification, recapitalization, split, combination or exchange of shares.

                  (b) Each share of the Series A Convertible Preferred Stock,
par value $.01 per share, of OEI (the "OEI Preferred Stock") issued and
outstanding immediately prior to the Effective Time shall be converted
automatically into one share of preferred stock, par value $1.00 per share, of
Seagull, having substantially equivalent rights, preferences and limitations as
the OEI Preferred Stock but convertible into Seagull Common Stock instead of OEI
Common Stock in the manner contemplated by the terms of the OEI Preferred Stock
(the "Seagull Preferred Stock"). No certificates representing Seagull Preferred
Stock shall be issued to holders of OEI Preferred Stock by virtue of
consummation of the Merger unless requested by such holders. Instead, following
the Merger, certificates that prior to the Effective Time represented shares of
OEI Preferred Stock shall be deemed for all purposes to represent an equal
number of shares of Seagull Preferred Stock. From and after the Effective Time,
the stock transfer books of OEI shall be closed and no transfer of any such
shares of OEI Preferred Stock shall thereafter be made, but when certificates
that formerly

                                        3

<PAGE>   9
represented shares of OEI Preferred Stock are duly presented to Seagull or its
transfer agent for exchange or transfer, Seagull will cause to be issued in
respect thereof certificates representing an equal number of shares of Seagull
Preferred Stock.

                  (c) Each share of Seagull Common Stock issued and outstanding
immediately prior to the Effective Time shall not be affected by the Merger.

                  (d) No dividends or other distributions declared or made after
the Effective Time with a record date after the Effective Time shall be paid to
the holder of any unsurrendered Common Stock Certificate with respect to the
Common Stock Merger Consideration represented thereby until the holder of record
of such Common Stock Certificate shall surrender such Common Stock Certificate
in accordance with Section 3.2. Subject to the effect of applicable laws
(including, without limitation, escheat and abandoned property laws), following
surrender of any such Common Stock Certificate there shall be paid to the record
holder of the certificate or certificates representing the Common Stock Merger
Consideration issued in exchange therefor, without interest, (i) the amount of
dividends or other distributions with a record date after the Effective Time
theretofore paid with respect to such Common Stock Merger Consideration, and
(ii) if the payment date for any dividend or distribution payable with respect
to such Common Stock Merger Consideration has not occurred prior to the
surrender of such Common Stock Certificate, at the appropriate payment date
therefor, the amount of dividends or other distributions with a record date
after the Effective Time but prior to the surrender of such Common Stock
Certificate and a payment date subsequent to the surrender of such Common Stock
Certificate.

                  (e) All Seagull Common Stock issued upon the surrender of
Common Stock Certificates in accordance with the terms hereof shall be deemed to
have been issued in full satisfaction of all rights pertaining to such Common
Stock Certificates and the OEI Common Stock formerly represented thereby, and
from and after the Effective Time there shall be no further registration of
transfers effected on the stock transfer books of the Surviving Corporation of
shares of OEI Common Stock which were outstanding immediately prior to the
Effective Time. If, after the Effective Time, Common Stock Certificates are
presented to the Surviving Corporation for any reason, they shall be canceled
and exchanged as provided in this Article III.

         Section 3.2  Surrender and Payment.

                  (a) Prior to the Effective Time, Seagull shall appoint an 
agent reasonably acceptable to OEI (the "Exchange Agent") for the purpose of
exchanging Common Stock Certificates formerly representing OEI Common Stock. At
or prior to the Effective Time, Seagull shall deposit with the Exchange Agent
for the benefit of the holders of OEI Common Stock, for exchange in accordance
with this Section 3.2 through the Exchange Agent, (i) as of the Effective Time,
certificates representing the Common Stock Merger Consideration to be issued
pursuant to Section 3.1(a) and (ii) from time to time as necessary, cash to be
paid in lieu of fractional shares pursuant to Section 3.4 (such certificates for
the Common Stock Merger Consideration and such cash being hereinafter referred
to as the "Exchange Fund"). The Exchange Agent shall, pursuant to irrevocable
instructions, deliver the Common Stock Merger Consideration and cash in exchange
for surrendered Common Stock Certificates formerly representing OEI Common Stock
pursuant to Section 3.1 out of the Exchange Fund. Except as contemplated by
Section 3.2(f), the Exchange Fund shall not be used for any other purpose.

                                        4

<PAGE>   10

                  (b) Promptly after the Effective Time, but in any event not
later than five business days thereafter, Seagull will send, or will cause the
Exchange Agent to send, to each holder of a Common Stock Certificate or
Certificates that immediately prior to the Effective Time represented
outstanding OEI Common Stock a letter of transmittal and instructions for use in
effecting the exchange of such Common Stock Certificates for certificates
representing the Common Stock Merger Consideration and, if applicable, cash in
lieu of fractional shares. Provision also shall be made for holders of Common
Stock Certificates to procure in person immediately after the Effective Time a
letter of transmittal and instructions and to deliver in person immediately
after the Effective Time such letter of transmittal and Common Stock
Certificates in exchange for the Common Stock Merger Consideration and, if
applicable, cash.

                  (c) After the Effective Time, Common Stock Certificates shall
represent the right, upon surrender thereof to the Exchange Agent, together with
a duly executed and properly completed letter of transmittal relating thereto,
to receive in exchange therefor that number of whole shares of Seagull Common
Stock, and, if applicable, cash that such holder has the right to receive
pursuant to Sections 3.1 and 3.4 after giving effect to any required tax
withholding, and the Common Stock Certificate or Certificates so surrendered
shall be canceled. No interest will be paid or will accrue on any cash amount
payable upon the surrender of any such Common Stock Certificates. Until so
surrendered, each such Common Stock Certificate shall, after the Effective Time,
represent for all purposes only the right to receive, upon such surrender,
Seagull Common Stock and, if applicable, cash as contemplated by this Article
III.

                  (d) If any shares of Seagull Common Stock are to be issued
and/or cash to be paid to a Person other than the registered holder of the
Common Stock Certificate or Certificates surrendered in exchange therefor, it
shall be a condition to such issuance that the Common Stock Certificate or
Certificates so surrendered shall be properly endorsed or otherwise be in proper
form for transfer and that the Person requesting such issuance shall pay to the
Exchange Agent any transfer or other taxes required as a result of such issuance
to a Person other than the registered holder or establish to the satisfaction of
the Exchange Agent that such tax has been paid or is not applicable. For
purposes of this Agreement, "Person" means an individual, a corporation, a
limited liability company, a partnership, an association, a trust or any other
entity or organization, including a governmental or political subdivision or any
agency or instrumentality thereof.

                  (e) After the Effective Time, the stock transfer books of OEI
shall be closed and there shall be no further registration of transfers of OEI
Common Stock outstanding prior to the Effective Time. If, at or after the
Effective Time, Common Stock Certificates are presented to the Surviving
Corporation, they shall be canceled and exchanged as provided for, and in
accordance with the procedures set forth, in this Article III.

                  (f) Any Common Stock Merger Consideration and any cash in the
Exchange Fund that remain unclaimed by the holders of OEI Common Stock one year
after the Effective Time shall be returned to Seagull, upon demand, and any such
holder who has not exchanged such holder's Common Stock Certificates in
accordance with this Section 3.2 prior to that time shall thereafter

                                        5

<PAGE>   11
look only to Seagull, as general creditors thereof, to exchange such Common
Stock Certificates or to pay amounts to which they are entitled pursuant to
Section 3.1. If outstanding Common Stock Certificates are not surrendered prior
to six years after the Effective Time (or, in any particular case, prior to such
earlier date on which any Common Stock Merger Consideration issuable in respect
of such Common Stock Certificates or the dividends and other distributions, if
any, described below would otherwise escheat to or become the property of any
governmental unit or agency), the Common Stock Merger Consideration issuable in
respect of such Common Stock Certificates, and the amount of dividends and other
distributions, if any, which have become payable and which thereafter become
payable on the Common Stock Merger Consideration evidenced by such Common Stock
Certificates as provided herein shall, to the extent permitted by applicable
law, become the property of Seagull, free and clear of all claims or interest of
any Person previously entitled thereto. Notwithstanding the foregoing, none of
Seagull, OEI or the Surviving Corporation shall be liable to any holder of
Common Stock Certificates for any amount paid, or Common Stock Merger
Consideration, cash or dividends delivered, to a public official pursuant to
applicable abandoned property, escheat or similar laws.

                  (g) If any Common Stock Certificate shall have been lost,
stolen or destroyed, upon the making of an affidavit of that fact by the Person
claiming such Common Stock Certificate to be lost, stolen or destroyed and, if
required by the Surviving Corporation, the posting by such Person of a bond in
such reasonable amount as Seagull may direct as indemnity against any claim that
may be made against it with respect to such Common Stock Certificate, the
Exchange Agent will issue in exchange for such lost, stolen or destroyed Common
Stock Certificate the Common Stock Merger Consideration and, if applicable, cash
and unpaid dividends and other distributions on any Common Stock Merger
Consideration deliverable in respect thereof pursuant to this Agreement.

         Section 3.3  Stock Options.

                  (a) At the Effective Time, automatically and without any
action on the part of the holder thereof, each outstanding employee or director
stock option of OEI outstanding at the Effective Time (the "OEI Stock Options")
shall be assumed by Seagull and become an option to purchase that number of
shares of Seagull Common Stock obtained by multiplying the number of shares of
OEI Common Stock issuable upon the exercise of such option by the Common Stock
Exchange Ratio at an exercise price per share equal to the per share exercise
price of such option divided by the Common Stock Exchange Ratio and otherwise
upon the same terms and conditions as such outstanding options to purchase OEI
Common Stock; provided, however, that in the case of any option to which Section
421 of the Code applies by reason of the qualifications under Section 422 or 423
of such Code, the exercise price, the number of shares purchasable pursuant to
such option and the terms and conditions of exercise of such option shall comply
with Section 424(a) of the Code.

                  (b) At the Effective Time, automatically and without any
action by any person, each outstanding OEI Stock Option and each outstanding
employee or director stock option of Seagull outstanding at the Effective Time
shall become immediately exercisable and each share of restricted stock of OEI
and Seagull shall become nonforfeitable.


                                        6

<PAGE>   12
                  (c) Seagull shall take all corporate actions necessary to
reserve for issuance a sufficient number of shares of Seagull Common Stock for
delivery upon exercise of OEI Stock Options assumed by Seagull pursuant to
Section 3.3(a) above.

                  (d) As promptly as practicable after the Effective Time,
Seagull shall file a Registration Statement on Form S-8, as the case may be (or
any successor or other appropriate forms) with respect to the shares of Seagull
Common Stock subject to OEI Stock Options and shall use all reasonable efforts
to maintain the effectiveness of such registration statement or registration
statements (and maintain the current status of the prospectus or prospectuses
contained therein) for so long as such options remain outstanding.

                  (e) Each of the OEI stock option plans providing for the
issuance or grant of options in respect to the stock of OEI shall be assumed as
of the Effective Time by Seagull with such amendments thereto as may be required
to reflect the Merger, including, without limitation, the substitution of
Seagull Common Stock for OEI Common Stock thereunder.

         Section 3.4 No Fractional Shares. No fractional shares of Seagull
Common Stock shall be issued in the Merger and fractional share interests shall
not entitle the owner thereof to vote or to any rights of a stockholder of
Seagull. All holders of fractional shares of Seagull Common Stock shall be
entitled to receive, in lieu thereof, an amount in cash determined by
multiplying the fraction of a share of Seagull Common Stock to which such holder
would otherwise have been entitled by the closing sales price of Seagull Common
Stock as reported under "NYSE Composite Transaction Reports" in The Wall Street
Journal on the trading day prior to the Effective Time.

         Section 3.5 Closing. The closing of the transactions contemplated by
this Agreement (the "Closing") shall take place at a location mutually
acceptable to OEI and Seagull, at 10:00 a.m., local time, on the day (the
"Closing Date") on which all of the conditions set forth in Article VIII hereof
are satisfied or waived (but not earlier than February 20, 1999), or at such
other date and time as Seagull and OEI shall otherwise agree.


                                   ARTICLE IV

                      REPRESENTATIONS AND WARRANTIES OF OEI

                  OEI represents and warrants to Seagull as follows:

         Section 4.1  Organization and Qualification.

                  (a) OEI is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware, is duly qualified to
do business as a foreign corporation and is in good standing in the
jurisdictions set forth in Section 4.1(a) of the disclosure letter delivered to
Seagull contemporaneously with the execution hereof (the "OEI Disclosure
Schedule"), which include each jurisdiction in which the character of OEI's
properties or the nature of its business makes such qualification necessary,
except in jurisdictions, if any, where the failure to be so qualified would not
result in an OEI Material Adverse Effect (as defined below). OEI has all

                                        7

<PAGE>   13
requisite corporate or other power and authority to own, use or lease its
properties and to carry on its business as it is now being conducted. OEI has
made available to Seagull a complete and correct copy of its certificate of
incorporation and bylaws, each as amended to date, and OEI's certificate of
incorporation and bylaws as so delivered are in full force and effect. OEI is
not in default in any respect in the performance, observation or fulfillment of
any provision of its certificate of incorporation or bylaws.

                  (b) Section 4.1(b) of the OEI Disclosure Schedule lists the
name and jurisdiction of organization of each Subsidiary of OEI and the
jurisdictions in which each such Subsidiary is qualified or holds licenses to do
business as a foreign corporation or other organization as of the date hereof.
Each of OEI's Subsidiaries is a corporation duly organized, validly existing and
in good standing under the laws of its jurisdiction of incorporation, is duly
qualified to do business as a foreign corporation and is in good standing in the
jurisdictions listed in Section 4.1(b) of the OEI Disclosure Schedule, which
includes each jurisdiction in which the character of such Subsidiary's
properties or the nature of its business makes such qualification necessary,
except in jurisdictions, if any, where the failure to be so qualified would not
result in an OEI Material Adverse Effect. Each of OEI's Subsidiaries has the
requisite corporate or other power and authority to own, use or lease its
properties and to carry on its business as it is now being conducted and as it
is now proposed to be conducted. OEI has made available to Seagull a complete
and correct copy of the certificate of incorporation and bylaws (or similar
organizational documents) of each of OEI's Subsidiaries, each as amended to
date, and the certificate of incorporation and bylaws (or similar organizational
documents) as so delivered are in full force and effect. No Subsidiary of OEI is
in default in any respect in the performance, observation or fulfillment of any
provision of its articles of incorporation or bylaws (or similar organizational
documents). Other than OEI's Subsidiaries, OEI does not beneficially own or
control, directly or indirectly, 5% or more of any class of equity or similar
securities of any corporation or other organization, whether incorporated or
unincorporated.

                  (c) For purposes of this Agreement, (i) a "OEI Material
Adverse Effect" shall mean any event, circumstance, condition, development or
occurrence causing, resulting in or having (or with the passage of time likely
to cause, result in or have) a material adverse effect on the financial
condition, business, assets, properties, prospects or results of operations of
OEI and its Subsidiaries taken as a whole; provided, that such term shall not
include effects that are not applicable primarily to OEI resulting from market
conditions generally in the oil and gas industry; and (ii) "Subsidiary" shall
mean, with respect to any party, any corporation or other organization, whether
incorporated or unincorporated, of which (x) at least a majority of the
securities or other interests having by their terms voting power to elect a
majority of the Board of Directors or others performing similar functions with
respect to such corporation or other organization is directly or indirectly
beneficially owned or controlled by such party or by any one or more of its
subsidiaries, or by such party and one or more of its subsidiaries, or (y) such
party or any Subsidiary of such party is a general partner of a partnership or a
manager of a limited liability company.



                                       8
<PAGE>   14
         Section 4.2  Capitalization.

                  (a) The authorized capital stock of OEI consists of
250,000,000 shares of OEI Common Stock and 10,000,000 shares of preferred stock,
par value $.01 per share, of which 50,000 shares have been designated and issued
as the OEI Preferred Stock and of which 2,000,000 shares have been designated as
Series A Junior Participating Preferred Stock. As of the date of this
Agreement, (i) 101,767,418 shares of OEI Common Stock were issued and
outstanding, (ii) 50,000 shares of OEI Preferred Stock were issued and
outstanding, and (iii) stock options to acquire 12,791,083 shares of OEI Common
Stock were outstanding under all stock option plans and agreements of OEI or its
Subsidiaries. All of the outstanding shares of OEI Common Stock and OEI
Preferred Stock are validly issued, fully paid and nonassessable, and free of
preemptive rights. Except as set forth above, in the Rights Agreement dated as
of December 22, 1997 between OEI and Harris Trust and Savings Bank, as amended
(the "OEI Rights Plan"), and pursuant to the OEI Preferred Stock, there are no
outstanding subscriptions, options, rights, warrants, convertible securities,
stock appreciation rights, phantom equity, or other agreements or commitments
obligating OEI to issue, transfer, sell, redeem, repurchase or otherwise acquire
any shares of its capital stock of any class. Except for any amendments filed
with the OEI SEC Reports (as defined below), the OEI Rights Plan has not been
amended except to provide that the OEI Rights Plan is inapplicable to the
execution and delivery of this Agreement and the transactions contemplated
hereby and any other agreement executed and delivered in connection herewith. No
"Distribution Date" has occurred within the meaning of the OEI Rights Plan, and
the consummation of the transactions contemplated hereby will not result in the
occurrence of a Distribution Date. OEI has taken all action required to render
the OEI Rights Plan (and the "Rights" thereunder) inapplicable to this Agreement
and the transactions contemplated hereby, including any other agreement executed
and delivered in connection herewith, including, without limitation, the Voting
Agreements (the "Ancillary Agreements").

                  (b) Except as set forth on Section 4.2(b) of the OEI
Disclosure Schedule, OEI is, directly or indirectly, the record and beneficial
owner of all of the outstanding shares of capital stock of each OEI Subsidiary,
there are no irrevocable proxies with respect to any such shares, and no equity
securities of any OEI Subsidiary are or may become required to be issued by
reason of any options, warrants, rights to subscribe to, calls or commitments of
any character whatsoever relating to, or securities or rights convertible into
or exchangeable or exercisable for, shares of any capital stock of any OEI
Subsidiary, and there are no contracts, commitments, understandings or
arrangements by which OEI or any OEI Subsidiary is or may be bound to issue
additional shares of capital stock of any OEI Subsidiary or securities
convertible into or exchangeable or exercisable for any such shares. Except as
set forth on Section 4.2(b) of the OEI Disclosure Schedule, all of such shares
so owned by OEI are validly issued, fully paid and nonassessable and are owned
by it free and clear of all liens, mortgages, pledges, security interests,
encumbrances, claims or charges of any kind (collectively, "Liens").

         Section 4.3 Authority. OEI has full corporate power and authority to
execute and deliver this Agreement and the Ancillary Agreements to which OEI is
or will be a party and, subject to obtaining the OEI Stockholders' Approval as
contemplated by Section 7.13, to consummate the transactions contemplated hereby
and thereby. The execution, delivery and performance of this Agreement and the
Ancillary Agreements to which OEI is or will be a party and the consummation of
the 


                                        9

<PAGE>   15
transactions contemplated hereby and thereby have been duly and validly
authorized by OEI's Board of Directors (with at least two-thirds of the members
of the Board of Directors of OEI voting in favor thereof), and no other
corporate proceedings on the part of OEI are necessary to authorize this
Agreement and the Ancillary Agreements to which OEI is or will be a party or to
consummate the transactions contemplated hereby or thereby, other than OEI
Stockholders' Approval as contemplated by Section 7.13 hereof. This Agreement
has been, and the Ancillary Agreements to which OEI is or will be a party are,
or upon execution will be, duly and validly executed and delivered by OEI and,
assuming the due authorization, execution and delivery hereof and thereof by the
other parties hereto and thereto, constitutes, or upon execution will
constitute, valid and binding obligations of OEI enforceable against OEI in
accordance with their respective terms, except as such enforceability may be
subject to the effects of bankruptcy, insolvency, reorganization, moratorium and
other laws relating to or affecting the rights of creditors and of general
principles of equity (the "Enforceability Exception").

         Section 4.4 Consents and Approvals; No Violation. The execution and
delivery of this Agreement, the consummation of the transactions contemplated
hereby and the performance by OEI of its obligations hereunder will not:

                  (a) subject to the obtaining of any requisite approvals of
OEI's stockholders as contemplated by Section 7.13 hereof, conflict with any
provision of OEI's certificate of incorporation or bylaws or the certificates of
incorporation or bylaws (or other similar organizational documents) of any of
its Subsidiaries;

                  (b) subject to the obtaining of any requisite approvals of
OEI's stockholders as contemplated by Section 7.13 hereof, require any consent,
waiver, approval, order, authorization or permit of, or registration, filing
with or notification to, (i) any governmental or regulatory authority or agency
(a "Governmental Authority"), except for applicable requirements of the
Hart-Scott- Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
Act"), the Securities Act of 1933, as amended (the "Securities Act"), the
Exchange Act, state laws relating to takeovers, if applicable, state securities
or blue sky laws, laws, rules or regulations administered by the Alaska Public
Utilities Commission ("APUC"), except as set forth in Section 4.4(b) of the OEI
Disclosure Schedule and except for approvals that are ministerial in nature and
are customarily obtained from Governmental Authorities after the Effective Time
in connection with transactions of the same nature as are contemplated hereby
("Customary Post-Closing Consents") or (ii) except as set forth in Section
4.4(b) of the OEI Disclosure Schedule, any third party other than a Governmental
Authority, other than such non-Governmental Authority third party consents,
waivers, approvals, orders, authorizations and permits that would not (i) result
in an OEI Material Adverse Effect, (ii) materially impair the ability of OEI or
any of its Subsidiaries, as the case may be, to perform its obligations under
this Agreement or any Ancillary Agreement or (iii) prevent the consummation of
any of the transactions contemplated by this Agreement;

                  (c) except as set forth in Section 4.4(c) of the OEI
Disclosure Schedule, result in any violation of or the breach of or constitute a
default (with notice or lapse of time or both) under, or give rise to any right
of termination, cancellation or acceleration or guaranteed payments or a loss of
a material benefit under, any of the terms, conditions or provisions of any
note, lease, mortgage, license, agreement or other instrument or obligation to
which OEI or any of its Subsidiaries is a party





                                       10

<PAGE>   16

or by which OEI or any of its Subsidiaries or any of their respective properties
or assets may be bound, except for such violations, breaches, defaults, or
rights of termination, cancellation or acceleration, or losses as to which
requisite waivers or consents have been obtained or which, individually or in
the aggregate, would not (i) result in an OEI Material Adverse Effect, (ii)
materially impair the ability of OEI or any of its Subsidiaries to perform its
obligations under this Agreement or any Ancillary Agreement or (iii) prevent the
consummation of any of the transactions contemplated by this Agreement;

                  (d) violate the provisions of any order, writ, injunction,
judgment, decree, statute, rule or regulation applicable to OEI or any
Subsidiary of OEI;

                  (e) result in the creation of any Lien upon any shares of
capital stock or material properties or assets of OEI or any of its Subsidiaries
under any agreement or instrument to which OEI or any of its Subsidiaries is a
party or by which OEI or any of its Subsidiaries or any of their properties or
assets is bound; or

                  (f) except as set forth in Section 4.4(f) of the OEI
Disclosure Schedule, result in any holder of any securities of OEI being
entitled to appraisal, dissenters' or similar rights.

         Section 4.5 OEI SEC Reports. OEI has filed with the Securities and
Exchange Commission (the "SEC"), and has heretofore made available to Seagull
true and complete copies of, each form, registration statement, report,
schedule, proxy or information statement and other document (including exhibits
and amendments thereto), including without limitation its Annual Reports to
Stockholders incorporated by reference in certain of such reports, required to
be filed by it or its predecessors with the SEC since December 31, 1994 under
the Securities Act or the Exchange Act (collectively, the "OEI SEC Reports"). As
of the respective dates such OEI SEC Reports were filed or, if any such OEI SEC
Reports were amended, as of the date such amendment was filed, each of the OEI
SEC Reports, including without limitation any financial statements or schedules
included therein, (a) complied in all material respects with all applicable
requirements of the Securities Act and the Exchange Act, as the case may be, and
the applicable rules and regulations promulgated thereunder, and (b) did not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they were made, not
misleading.

         Section 4.6 Financial Statements. Each of the audited consolidated
financial statements and unaudited consolidated interim financial statements of
OEI (including any related notes and schedules) included (or incorporated by
reference) in its Annual Reports on Form 10-K for each of the three fiscal years
ended December 31, 1995, 1996 and 1997, in its Current Report on Form 8-K filed
with the SEC on March 27, 1998 and its Quarterly Report on Form 10-Q for its
fiscal quarter ended September 30, 1998 (collectively, the "Financial
Statements") have been prepared from, and are in accordance with, the books and
records of OEI and its consolidated Subsidiaries, comply in all material
respects with applicable accounting requirements and with the published rules
and regulations of the SEC with respect thereto, have been prepared in
accordance with generally accepted accounting principles ("GAAP") applied on a
consistent basis (except as may be indicated in the notes thereto and subject,
in the case of quarterly financial statements, to normal and recurring year-end
adjustments) and fairly present, in conformity with GAAP applied on a consistent
basis




                                       11

<PAGE>   17
(except as may be indicated in the notes thereto), the consolidated financial
position of OEI and its Subsidiaries as of the date thereof and the consolidated
results of operations and cash flows (and changes in financial position, if any)
of OEI and its Subsidiaries for the periods presented therein (subject to normal
year-end adjustments and the absence of financial footnotes in the case of any
unaudited interim financial statements).

         Section 4.7 Absence of Undisclosed Liabilities. Except (a) as
specifically disclosed in the OEI SEC Reports and (b) for liabilities and
obligations incurred in the ordinary course of business and consistent with past
practice since December 31, 1997, neither OEI nor any of its Subsidiaries has
incurred any liabilities or obligations of any nature (contingent or otherwise)
that would have an OEI Material Adverse Effect or would be required by GAAP to
be reflected on a consolidated balance sheet of OEI and its Subsidiaries or the
notes thereto which is not so reflected.

         Section 4.8 Absence of Certain Changes. Except as disclosed in the OEI
SEC Reports, as set forth in Section 4.8 of the OEI Disclosure Schedule or as
contemplated by this Agreement, since December 31, 1997 (a) OEI and its
Subsidiaries have conducted their business in all material respects in the
ordinary course consistent with past practices, (b) there has not been any
change or development, or combination of changes or developments that,
individually or in the aggregate, would have an OEI Material Adverse Effect, (c)
there has not been any declaration, setting aside or payment of any dividend or
other distribution with respect to any shares of capital stock of OEI, or any
repurchase, redemption or other acquisition by OEI or any of its Subsidiaries of
any outstanding shares of capital stock or other securities of, or other
ownership interests in, OEI or any of its Subsidiaries, (d) there has not been
any amendment of any term of any outstanding security of OEI or any of its
Subsidiaries, and (e) there has not been any change in any method of accounting
or accounting practice by OEI or any of its Subsidiaries, except for any such
change required by reason of a concurrent change in generally accepted
accounting principles or to conform a Subsidiary's accounting policies and
practices to those of OEI.

         Section 4.9 Taxes. Except as otherwise disclosed in Section 4.9 of the
OEI Disclosure Schedule and for matters that would have no adverse effect on
OEI:

                  (a) OEI and each of its Subsidiaries have timely filed (or
have had timely filed on their behalf) or will file or cause to be timely filed,
all material Tax Returns (as defined below) required by applicable law to be
filed by any of them prior to or as of the Closing Date. All such Tax Returns
and amendments thereto are or will be true, complete and correct in all material
respects.

                  (b) OEI and each of its Subsidiaries have paid (or have had
paid on their behalf), or where payment is not yet due, have established (or
have had established on their behalf and for their sole benefit and recourse),
or will establish or cause to be established on or before the Closing Date, an
adequate accrual for the payment of all material Taxes (as defined below) due
with respect to any period ending prior to or as of the Closing Date.

                  (c) No Audit (as defined below) by a Tax Authority (as defined
below) is pending or threatened with respect to any Tax Returns filed by, or
Taxes due from, OEI or any Subsidiary. No issue has been raised by any Tax
Authority in any Audit of OEI or any of its Subsidiaries that if raised with
respect to any other period not so audited could be expected to result in a
material 



                                       12

<PAGE>   18

proposed deficiency for any period not so audited. No material deficiency or
adjustment for any Taxes has been threatened, proposed, asserted or assessed
against OEI or any of its Subsidiaries. There are no liens for Taxes upon the
assets of OEI or any of its Subsidiaries, except liens for current Taxes not yet
delinquent.

                  (d) Neither OEI nor any of its Subsidiaries has given or been
requested to give any waiver of statutes of limitations relating to the payment
of Taxes or have executed powers of attorney with respect to Tax matters, which
will be outstanding as of the Closing Date.

                  (e) Prior to the date hereof, OEI and its Subsidiaries have
disclosed, and provided or made available true and complete copies to Seagull
of, all material Tax sharing, Tax indemnity, or similar agreements to which OEI
or any of its Subsidiaries are a party to, is bound by, or has any obligation or
liability for Taxes.

                  (f) As used in this Agreement, (i) "Audit" shall mean any
audit, assessment of Taxes, other examination by any Tax Authority, proceeding
or appeal of such proceeding relating to Taxes; (ii) "Taxes" shall mean all
Federal, state, local and foreign taxes, and other assessments of a similar
nature (whether imposed directly or through withholding), including any
interest, additions to tax, or penalties applicable thereto; (iii) "Tax
Authority" shall mean the Internal Revenue Service and any other domestic or
foreign Governmental Authority responsible for the administration of any Taxes;
and (iv) "Tax Returns" shall mean all Federal, state, local and foreign tax
returns, declarations, statements, reports, schedules, forms and information
returns and any amended Tax Return relating to Taxes.

         Section 4.10 Litigation. Except as disclosed in the OEI SEC Reports or
Section 4.10 of the OEI Disclosure Schedule and for matters that would not have
an OEI Material Adverse Effect, there is no suit, claim, action, proceeding or
investigation pending or, to OEI's knowledge, threatened against or directly
affecting OEI, any Subsidiaries of OEI or any of the directors or officers of
OEI or any of its Subsidiaries in their capacity as such, nor is there any
reasonable basis therefor that could reasonably be expected to have an OEI
Material Adverse Effect, if adversely determined. Neither OEI nor any of its
Subsidiaries, nor any officer, director or employee of OEI or any of its
Subsidiaries, has been permanently or temporarily enjoined by any order,
judgment or decree of any court or any other Governmental Authority from
engaging in or continuing any conduct or practice in connection with the
business, assets or properties of OEI or such Subsidiary nor, to the knowledge
of OEI, is OEI, any Subsidiary or any officer, director or employee of OEI or
its Subsidiaries under investigation by any Governmental Authority. Except as
disclosed in the OEI SEC Reports or Section 4.10 of the OEI Disclosure Schedule,
there is not in existence any order, judgment or decree of any court or other
tribunal or other agency enjoining or requiring OEI or any of its Subsidiaries
to take any action of any kind with respect to its business, assets or
properties. Notwithstanding the foregoing, no representation or warranty in this
Section 4.10 is made with respect to Environmental Laws, which are covered
exclusively by the provisions set forth in Section 4.12.


                                       13

<PAGE>   19
         Section 4.11  Employee Benefit Plans; ERISA.

                  (a) Section 4.11(a) of the OEI Disclosure Schedule contains a
true and complete list of the employee benefit plans or arrangements of any type
(including but not limited to plans described in section 3(3) of the Employee
Retirement Income Security Act of 1974, as amended ("ERISA")), sponsored,
maintained or contributed to by OEI or any trade or business, whether or not
incorporated, which together with OEI would be deemed a "single employer" within
the meaning of Section 414(b), (c) or (m) of the Code or section 4001(b)(1) of
ERISA (an "OEI ERISA Affiliate") within six years prior to the Effective Time
("OEI Benefit Plans").

                  (b) With respect to each OEI Benefit Plan: (i) if intended to
qualify under section 401(a) or 401(k) of the Code, such plan satisfies the
requirements of such sections, has received a favorable determination letter
from the Internal Revenue Service with respect to its qualification, and its
related trust has been determined to be exempt from tax under section 501(a) of
the Code and, to the knowledge of OEI, nothing has occurred since the date of
such letter to adversely affect such qualification or exemption; (ii) each such
plan has been administered in substantial compliance with its terms and
applicable law, except for any noncompliance with respect to any such plan that
could not reasonably be expected to result in an OEI Material Adverse Effect;
(iii) neither OEI nor any OEI ERISA Affiliate has engaged in, and OEI and each
OEI ERISA Affiliate do not have any knowledge of any person that has engaged in,
any transaction or acted or failed to act in any manner that would subject OEI
or any OEI ERISA Affiliate to any liability for a breach of fiduciary duty under
ERISA that could reasonably be expected to result in an OEI Material Adverse
Effect; (iv) no disputes are pending or, to the knowledge of OEI or any OEI
ERISA Affiliate, threatened; (v) neither OEI nor any OEI ERISA Affiliate has
engaged in, and OEI and each OEI ERISA Affiliate do not have any knowledge of
any person that has engaged in, any transaction in violation of Section 406(a)
or (b) of ERISA or Section 4975 of the Code for which no exemption exists under
Section 408 of ERISA or Section 4975(c) of the Code or Section 4975(d) of the
Code that could reasonably be expected to result in an OEI Material Adverse
Effect; (vi) there have been no "reportable events" within the meaning of
Section 4043 of ERISA for which the 30 day notice requirement of ERISA has not
been waived by the Pension Benefit Guaranty Corporation (the "PBGC"); (vii) all
contributions due have been made on a timely basis (within, where applicable,
the time limit established under section 302 of ERISA or Code section 412);
(viii) no notice of intent to terminate such plan has been given under section
4041 of ERISA and no proceeding has been instituted under section 4042 of ERISA
to terminate such plan; and (ix) except for defined benefit plans (if
applicable), such plan may be terminated on a prospective basis without any
continuing liability for benefits other than benefits accrued to the date of
such termination. All contributions made or required to be made under any OEI
Benefit Plan meet the requirements for deductibility under the Code, and all
contributions which are required and which have not been made have been properly
recorded on the books of OEI or an OEI ERISA Affiliate.

                  (c) No OEI Benefit Plan is a "multiemployer plan" (as defined
in section 4001(a)(3) of ERISA) or a "multiple employer plan" (within the
meaning of section 413(c) of the Code). No event has occurred with respect to
OEI or an OEI ERISA Affiliate in connection with which OEI could be subject to
any liability, lien or encumbrance with respect to any OEI Benefit Plan or any
employee benefit plan described in section 3(3) of ERISA maintained, sponsored
or contributed to by an OEI ERISA Affiliate under ERISA or the Code.

                  (d) Except as set forth in Section 4.11(d) of the OEI
Disclosure Schedule, no employees of OEI or any of its Subsidiaries are covered
by any severance plan or similar arrangement.





                                       14

<PAGE>   20
         Section 4.12  Environmental Liability.  Except as set forth in Section
4.12 of the OEI Disclosure Schedule:

                  (a) The businesses of OEI and its Subsidiaries have been and
are operated in material compliance with all federal, state and local
environmental protection, health and safety or similar laws, statutes,
ordinances, restrictions, licenses, rules, regulations, permit conditions and
legal requirements, including without limitation the Federal Clean Water Act,
Safe Drinking Water Act, Resource Conservation & Recovery Act, Clean Air Act,
Outer Continental Shelf Lands Act, Comprehensive Environmental Response,
Compensation and Liability Act, and Emergency Planning and Community Right to
Know Act, each as amended and currently in effect (together, "Environmental
Laws").

                  (b) Neither OEI nor any of its Subsidiaries has caused or
allowed the generation, treatment, manufacture, processing, distribution, use,
storage, discharge, release, disposal, transport or handling of any chemicals,
pollutants, contaminants, wastes, toxic substances, hazardous substances,
petroleum, petroleum products or any substance regulated under any Environmental
Law ("Hazardous Substances") at any of its properties or facilities, except in
material compliance with all Environmental Laws, and, to OEI's knowledge, no
generation, manufacture, processing, distribution, use, treatment, handling,
storage, discharge, release, disposal, transport or handling of any Hazardous
Substances has occurred at any property or facility owned, leased or operated by
OEI or any of its Subsidiaries except in material compliance with all
Environmental Laws.

                  (c) Neither OEI nor any of its Subsidiaries has received any
written notice from any Governmental Authority or third party or, to the
knowledge of OEI, any other communication alleging or concerning any material
violation by OEI or any of its Subsidiaries of, or responsibility or liability
of OEI or any of its Subsidiaries under, any Environmental Law. There are no
pending, or to the knowledge of OEI, threatened, claims, suits, actions,
proceedings or investigations with respect to the businesses or operations of
OEI or any of its Subsidiaries alleging or concerning any material violation of
or responsibility or liability under any Environmental Law that, if adversely
determined, could reasonably be expected to have an OEI Material Adverse Effect,
nor does OEI have any knowledge of any fact or condition that could give rise to
such a claim, suit, action, proceeding or investigation.

                  (d) OEI and its Subsidiaries are in possession of all material
approvals, permits, licenses, registrations and similar type authorizations from
all Governmental Authorities under all Environmental Laws with respect to the
operation of the businesses of OEI and its Subsidiaries; there are no pending
or, to the knowledge of OEI, threatened, actions, proceedings or investigations
seeking to modify, revoke or deny renewal of any of such approvals, permits,
licenses, registrations and authorizations; and OEI does not have knowledge of
any fact or condition that is reasonably likely to give rise to any action,
proceeding or investigation to modify, revoke or deny renewal of any of such
approvals, permits, licenses, registrations and authorizations.

                  (e) Without in any way limiting the generality of the
foregoing, (i) to the knowledge of OEI, all off-site locations where OEI or any
of its Subsidiaries has transported, released, discharged, stored, disposed or
arranged for the disposal of pollutants, contaminants, hazardous



                                       15

<PAGE>   21

wastes or toxic substances are licensed disposal sites as required by law, (ii)
to OEI's knowledge, all underground storage tanks, and the operating status,
capacity and contents of such tanks, located on any property owned, leased or
operated by OEI or any of its Subsidiaries are identified in Section 4.12 of the
OEI Disclosure Schedule and (iii) no polychlorinated biphenyls ("PCBs") or PCB-
containing items are used or stored at any property owned, leased or operated by
OEI or any of its Subsidiaries except in compliance with Environmental Laws.

                  (f) There has been no discharge, release or disposal at any of
the properties owned or operated by OEI, its Subsidiaries, or a predecessor in
interest, or to the knowledge of OEI, at any disposal or treatment facility
which received Hazardous Substances generated by OEI, its Subsidiaries, or any
predecessor in interest which could reasonably be expected to result in
liabilities that have an OEI Material Adverse Effect.

                  (g) To OEI's knowledge, no pending claims have been asserted
or threatened to be asserted against OEI or its Subsidiaries for any personal
injury (including wrongful death) or property damage (real or personal) arising
out of exposure to Hazardous Substances used, handled, generated, transported or
disposed by OEI or its Subsidiaries at property owned or operated by OEI or its
Subsidiaries, except as could not reasonably be expected to result in
liabilities that have an OEI Material Adverse Effect.

         Section 4.13 Compliance with Applicable Laws. OEI and each of its
Subsidiaries hold all material approvals, licenses, permits, registrations and
similar type authorizations necessary for the lawful conduct of its respective
businesses, as now conducted, and such businesses are not being, and neither OEI
nor any of its Subsidiaries has received any notice from any Governmental
Authority or person that any such business has been or is being conducted in
violation of any law, ordinance or regulation, including without limitation any
law, ordinance or regulation relating to occupational health and safety, except
for possible violations which either individually or in the aggregate have not
resulted and would not result in an OEI Material Adverse Effect; provided,
however, notwithstanding the foregoing, no representation or warranty in this
Section 4.13 is made with respect to Environmental Laws, which are covered
exclusively by the provisions set forth in Section 4.12.

         Section 4.14 Insurance. Section 4.14 of the OEI Disclosure Schedule
lists each of the insurance policies relating to OEI or its Subsidiaries which
are currently in effect. OEI has made available to Seagull a true, complete and
correct copy of each such policy or the binder therefor. With respect to each
such insurance policy or binder none of OEI, any of its Subsidiaries or any
other party to the policy is in breach or default thereunder (including with
respect to the payment of premiums or the giving of notices), and OEI does not
know of any occurrence or any event which (with notice or the lapse of time or
both) would constitute such a breach or default or permit termination,
modification or acceleration under the policy, except for such breaches or
defaults which, individually or in the aggregate, would not result in an OEI
Material Adverse Effect. Section 4.14 of the OEI Disclosure Schedule describes
any self-insurance arrangements affecting OEI or its Subsidiaries. The insurance
policies listed in Section 4.14 of the OEI Disclosure Schedule include all
policies which are required in connection with the operation of the businesses
of OEI and its Subsidiaries as currently conducted by applicable laws and all
agreements relating to OEI and its Subsidiaries. All premiums and other payments
relating to the officer's and director's liability insurance policy of United
Meridian Corporation as currently in effect (the "UMC D&O Policy") have been
paid for coverage through March 27, 2003.


                                       16

<PAGE>   22
         Section 4.15  Labor Matters; Employees.

                  (a) Except as set forth in Section 4.15 of the OEI Disclosure
Schedule, (i) there is no labor strike, dispute, slowdown, work stoppage or
lockout actually pending or, to the knowledge of OEI, threatened against or
affecting OEI or any of its Subsidiaries and, during the past five years, there
has not been any such action, (ii) none of OEI or any of its Subsidiaries is a
party to or bound by any collective bargaining or similar agreement with any
labor organization, or work rules or practices agreed to with any labor
organization or employee association applicable to employees of OEI or any of
its Subsidiaries, (iii) none of the employees of OEI or any of its Subsidiaries
are represented by any labor organization and none of OEI or any of its
Subsidiaries have any knowledge of any current union organizing activities among
the employees of OEI or any of its Subsidiaries nor does any question concerning
representation exist concerning such employees, (iv) OEI and its Subsidiaries
have each at all times been in material compliance with all applicable laws
respecting employment and employment practices, terms and conditions of
employment, wages, hours of work and occupational safety and health, and are not
engaged in any unfair labor practices as defined in the National Labor Relations
Act or other applicable law, ordinance or regulation, (v) there is no unfair
labor practice charge or complaint against any of OEI or any of its Subsidiaries
pending or, to the knowledge of OEI, threatened before the National Labor
Relations Board or any similar state or foreign agency, (vi) there is no
grievance or arbitration proceeding arising out of any collective bargaining
agreement or other grievance procedure relating to OEI or any of its
Subsidiaries, (vii) neither the Occupational Safety and Health Administration
nor any corresponding state agency has threatened to file any citation, and
there are no pending citations, relating to OEI or any of its Subsidiaries, and
(viii) there is no employee or governmental claim or investigation, including
any charges to the Equal Employment Opportunity Commission or state employment
practice agency, investigations regarding Fair Labor Standards Act compliance,
audits by the Office of Federal Contractor Compliance Programs, sexual
harassment complaints or demand letters or threatened claims.

                  (b) Since the enactment of the Worker Adjustment and
Retraining Notification Act of 1988 ("WARN Act"), none of OEI or any of its
Subsidiaries has effectuated (i) a "plant closing" (as defined in the WARN Act)
affecting any site of employment or one or more facilities or operating units
within any site of employment or facility of any of OEI or any of its
Subsidiaries, or (ii) a "mass layoff" (as defined in the WARN Act) affecting any
site of employment or facility of OEI or any of its Subsidiaries, nor has OEI or
any of its Subsidiaries been affected by any transaction or engaged in layoffs
or employment terminations sufficient in number to trigger application of any
similar state or local law, in each case that could reasonably be expected to
have an OEI Material Adverse Effect.

         Section 4.16  Reserve Reports.

                  (a) All information (including, without limitation, the
statement of the percentage of reserves from the oil and gas wells and other
interests evaluated therein to which OEI or its Subsidiaries are entitled and
the percentage of the costs and expenses related to such wells or 



                                       17

<PAGE>   23
interests to be borne by OEI or its Subsidiaries) supplied to each of
Netherland, Sewell & Associates, Inc., Ryder Scott Company Petroleum Engineers
and McDaniel & Associates Consultants, Ltd. by or on behalf of OEI and its
Subsidiaries that was material to each such firm's estimates of proved oil and
gas reserves attributable to the Oil and Gas Interests (as hereinafter defined)
of OEI and its Subsidiaries in connection with the preparation of the proved oil
and gas reserve reports concerning the Oil and Gas Interests of OEI and its
Subsidiaries as of December 31, 1997 and prepared by such engineering firms
(collectively, the "OEI Reserve Report") was (at the time supplied or as
modified or amended prior to the issuance of the OEI Reserve Report) true and
correct in all material respects and OEI has no knowledge of any material errors
in such information that existed at the time of such issuance. For purposes of
this Agreement "Oil and Gas Interests" means direct and indirect interests in
and rights with respect to oil, gas, mineral, and related properties and assets
of any kind and nature, direct or indirect, including working, leasehold and
mineral interests and operating rights and royalties, overriding royalties,
production payments, net profit interests and other nonworking interests and
nonoperating interests; all interests in rights with respect to oil, condensate,
gas, casinghead gas and other liquid or gaseous hydrocarbons (collectively,
"Hydrocarbons") and other minerals or revenues therefrom, all contracts in
connection therewith and claims and rights thereto (including all oil and gas
leases, operating agreements, unitization and pooling agreements and orders,
division orders, transfer orders, mineral deeds, royalty deeds, oil and gas
sales, exchange and processing contracts and agreements, and in each case,
interests thereunder), surface interests, fee interests, reversionary interests,
reservations, and concessions; all easements, rights of way, licenses, permits,
leases, and other interests associated with, appurtenant to, or necessary for
the operation of any of the foregoing; and all interests in equipment and
machinery (including wells, well equipment and machinery), oil and gas
production, gathering, transmission, treating, processing, and storage
facilities (including tanks, tank batteries, pipelines, and gathering systems),
pumps, water plants, electric plants, gasoline and gas processing plants,
refineries, and other tangible personal property and fixtures associated with,
appurtenant to, or necessary for the operation of any of the foregoing. Except
for changes generally affecting the oil and gas industry (including changes in
commodity prices), there has been no change in respect of the matters addressed
in the OEI Reserve Report that would have an OEI Material Adverse Effect.

                  (b) Set forth in Section 4.16(b) of the OEI Disclosure
Schedule is a list of all material Oil and Gas Interests that were included in
the OEI Reserve Report that have been disposed of prior to the date of this
Agreement.

         Section 4.17 Permits. Immediately prior to the Effective Time and
except for Customary Post-Closing Consents, OEI and its Subsidiaries hold all of
the permits, licenses, certificates, consents, approvals, entitlements, plans,
surveys, relocation plans, environmental impact reports and other authorizations
of Governmental Authorities ("Permits") required or necessary to construct, own,
operate, use and/or maintain its properties and conduct its operations as
presently conducted, except for such Permits, the lack of which, individually or
in the aggregate, would not have an OEI Material Adverse Effect; provided,
however, that notwithstanding the foregoing, no representation or warranty in
this Section 4.17 is made with respect to Permits issued pursuant to
Environmental Laws, which are covered exclusively by the provisions set forth in
Section 4.12.




                                       18

<PAGE>   24
         Section 4.18  Material Contracts.

                  (a) Set forth in Section 4.18(a) of the OEI Disclosure
Schedule is a list of each contract, lease, indenture, agreement, arrangement or
understanding to which OEI or any of its Subsidiaries is subject that is of a
type that would be required to be included as an exhibit to a Form S-1
Registration Statement pursuant to the rules and regulations of the SEC if such
a registration statement was filed by OEI (collectively, the "OEI Material
Contracts").

                  (b) Except as set forth in Section 4.18(a) or 4.18(b) of the
OEI Disclosure Schedule, the Oil and Gas Interests of OEI and its Subsidiaries
are not subject to (i) any instrument or agreement evidencing or related to
indebtedness for borrowed money, whether directly or indirectly, or (ii) any
agreement not entered into in the ordinary course of business in which the
amount involved is in excess of $500,000. With respect to the Oil and Gas
Interests of OEI and its Subsidiaries, (A) all OEI Material Contracts 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;
(B) OEI is not in material breach or default with respect to, and to the
knowledge of OEI, no other party to any OEI Material Contract is in material
breach or default with respect to, its obligations thereunder, including with
respect to payments or otherwise; (C) no party to any OEI Material Contract has
given notice of any action to terminate, cancel, rescind or procure a judicial
reformation thereof; and (D) no OEI Material Contract contains any provision
that prevents OEI or any of its Subsidiaries from owning, managing and operating
the Oil and Gas Interests of OEI and its Subsidiaries in accordance with
historical practices.

                  (c) As of the date of this Agreement, except as set forth in
Section 4.18(c) of the OEI Disclosure Schedule, with respect to authorizations
for expenditure executed on or after January 1, 1998, (i) there are no material
outstanding calls for payments that are due or that OEI or its Subsidiaries are
committed to make that have not been made; (ii) there are no material operations
with respect to which OEI or its Subsidiaries have become a non-consenting
party; and (iii) there are no commitments for the material expenditure of funds
for drilling or other capital projects other than projects with respect to which
the operator is not required under the applicable operating agreement to seek
consent.

                  (d) Except as set forth in Section 4.18(d) of the OEI
Disclosure Schedule, (i) there are no provisions applicable to the Oil and Gas
Interests of OEI and its Subsidiaries which increase the royalty percentage of
the lessor thereunder; and (ii) none of the Oil and Gas Interests of OEI and its
Subsidiaries are limited by terms fixed by a certain number of years (other than
primary terms under oil and gas leases).

         Section 4.19 Required Stockholder Vote or Consent. The only vote of the
holders of any class or series of OEI's capital stock that will be necessary to
consummate the Merger and the other transactions contemplated by this Agreement
is the approval and adoption of this Agreement by the holders of a majority of
the votes entitled to be cast by holders of the OEI Common Stock and the OEI
Preferred Stock, voting together as a single class, with each share of OEI
Common Stock being entitled to one vote per share and each share of OEI
Preferred Stock being entitled to a number of votes per share equal to the
number of shares of OEI Common Stock into which such share of OEI Preferred
Stock is then convertible (the "OEI Stockholders' Approval").




                                       19

<PAGE>   25


         Section 4.20 Proxy Statement/Prospectus; Registration Statement. None
of the information to be supplied by OEI for inclusion in (a) the joint proxy
statement relating to the OEI Special Meeting and the Seagull Special Meeting
(in each case, as defined below) (also constituting the prospectus in respect of
Seagull Common Stock into which shares of OEI Common Stock will be converted)
(the "Proxy Statement/Prospectus"), to be filed by OEI and Seagull with the SEC,
and any amendments or supplements thereto, or (b) the Registration Statement on
Form S-4 (the "Registration Statement") to be filed by Seagull with the SEC in
connection with the Merger, and any amendments or supplements thereto, will, at
the respective times such documents are filed, and, in the case of the Proxy
Statement/Prospectus, at the time the Proxy Statement/Prospectus or any
amendment or supplement thereto is first mailed to stockholders of OEI, at the
time such stockholders vote on approval and adoption of this Agreement and at
the Effective Time, and, in the case of the Registration Statement, when it
becomes effective under the Securities Act, contain any untrue statement of a
material fact or omit to state any material fact required to be made therein or
necessary in order to make the statements made therein, in light of the
circumstances under which they were made, not misleading.

         Section 4.21 Intellectual Property. OEI or its Subsidiaries own, or are
licensed or otherwise have the right to use, all patents, patent rights,
trademarks, rights, trade names, trade name rights, service marks, service mark
rights, copyrights, technology, know-how, processes and other proprietary
intellectual property rights and computer programs ("Intellectual Property")
currently used in the conduct of the business of OEI and its Subsidiaries,
except where the failure to so own or otherwise have the right to use such
intellectual property would not, individually or in the aggregate, have an OEI
Material Adverse Effect. No person has notified either OEI or any of its
Subsidiaries that their use of the Intellectual Property infringes on the rights
of any person, subject to such claims and infringements as do not, individually
or in the aggregate, give rise to any liability on the part of OEI and its
Subsidiaries that could have an OEI Material Adverse Effect, and, to OEI's
knowledge, no person is infringing on any right of OEI or any of its
Subsidiaries with respect to any such Intellectual Property. No claims are
pending or, to OEI's knowledge, threatened that OEI or any of its Subsidiaries
is infringing or otherwise adversely affecting the rights of any person with
regard to any Intellectual Property.

         Section 4.22 Hedging. Section 4.22 of the OEI Disclosure Schedule sets
forth for the periods shown obligations of OEI and each of its Subsidiaries for
the delivery of Hydrocarbons attributable to any of the properties of OEI or any
of its Subsidiaries in the future on account of prepayment, advance payment,
take-or-pay or similar obligations without then or thereafter being entitled to
receive full value therefor. Except as set forth in Section 4.22 of the OEI
Disclosure Schedule, as of the date of this Agreement, neither OEI nor any of
its Subsidiaries is bound by futures, hedge, swap, collar, put, call, floor,
cap, option or other contracts that are intended to benefit from, relate to or
reduce or eliminate the risk of fluctuations in the price of commodities,
including Hydrocarbons, or securities.

         Section 4.23 Brokers. No broker, finder or investment banker (other
than Lehman Brothers Inc. and J. P. Morgan & Co., the fees and expenses of which
will be paid by OEI) is entitled to any brokerage, finder's fee or other fee or
commission payable by OEI or any of its Subsidiaries in connection with the
transactions contemplated by this Agreement based upon arrangements made



                                       20

<PAGE>   26
by and on behalf of OEI or any of its Subsidiaries. True and correct copies of
all agreements and engagement letters currently in effect with Lehman Brothers
Inc. and J. P. Morgan & Co. (the "OEI Engagement Letters") have been provided to
Seagull.

         Section 4.24 Tax-Free Reorganization. Neither OEI nor, to the knowledge
of OEI, any of its affiliates has taken or agreed to take any action that would
prevent the Merger from constituting a reorganization within the meaning of
section 368(a) of the Code. Without limiting the generality of the foregoing:

                  (a) Prior to and in connection with the Merger, (i) none of
         the OEI Common Stock or OEI Preferred Stock will be redeemed, (ii) no
         extraordinary distribution will be made with respect to OEI Common
         Stock or OEI Preferred Stock, and (iii) none of the OEI Common Stock or
         OEI Preferred Stock will be acquired by any person related (as defined
         in Treas. Reg. ss. 1.368-1(e)(3) without regard to ss.
         1.368-1(e)(3)(i)(A)) to OEI.

                  (b) No assets of OEI have been sold, transferred or otherwise
         disposed of which would prevent Seagull from continuing the historic
         business of OEI or from using a significant portion of OEI's historic
         business assets in a business following the Merger, and OEI intends to
         continue its historic business or use a significant portion of its
         historic business assets in a business.

                  (c) OEI and the stockholders of OEI will each pay their
         respective expenses, if any, incurred in connection with the Merger.

                  (d) There is no intercorporate indebtedness existing between
         OEI and Seagull that was issued, acquired, or will be settled at a
         discount.

                  (e) OEI is not an investment company as defined in section
         368(a(2)(F)(iii) and (iv) of the Code.

                  (f) OEI is not under the jurisdiction of a court in a title 11
         or similar case within the meaning of section 368(a)(3)(A) of the Code.

                  (g) The liabilities of OEI were incurred by OEI in the
         ordinary course of its business.

         Section 4.25 Fairness Opinion. The Board of Directors of OEI has
received written opinions from Lehman Brothers Inc. and J. P. Morgan & Co. to
the effect that, as of the date of such opinions, the Common Stock Exchange
Ratio is fair from a financial point of view to the holders of OEI Common Stock.
True and complete copies of such opinions have been given to Seagull.

         Section 4.26 Year 2000 Issues. The disclosures set forth in the OEI SEC
Reports concerning potential computer hardware and software problems associated
with the Year 2000 are true and correct in all material respects.


                                       21

<PAGE>   27
         Section 4.27 Takeover Laws. OEI and the Board of Directors of OEI have
each taken all action required to be taken by it in order to exempt this
Agreement, and the transactions contemplated hereby from, and this Agreement and
the transactions contemplated hereby are exempt from, the requirements of any
"moratorium," "control share," "fair price," "affiliate transaction," "business
combination" or other antitakeover laws and regulations of any state, including,
without limitation, the State of Delaware, and including, without limitation,
Section 203 of the DGCL.


                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES
                                   OF SEAGULL

         Seagull represents and warrants to OEI as follows:

         Section 5.1  Organization and Qualification.

                  (a) Seagull is a corporation duly organized, validly existing
and in good standing under the laws of the State of Texas, is duly qualified to
do business as a foreign corporation and is in good standing in the
jurisdictions set forth in Section 5.1(a) of the disclosure letter delivered to
OEI contemporaneously with the execution hereof (the "Seagull Disclosure
Schedule"), which include each jurisdiction in which the character of Seagull's
properties or the nature of its business makes such qualification necessary,
except in jurisdictions, if any, where the failure to be so qualified would not
result in a Seagull Material Adverse Effect (as defined below). Seagull has all
requisite corporate or other power and authority to own, use or lease its
properties and to carry on its business as it is now being conducted. Seagull
has made available to OEI a complete and correct copy of its articles of
incorporation and bylaws, each as amended to date, and Seagull's articles of
incorporation and bylaws as so delivered are in full force and effect. Seagull
is not in default in any respect in the performance, observation or fulfillment
of any provision of its articles of incorporation or bylaws.

                  (b) Section 5.1(b) of the Seagull Disclosure Schedule lists
the name and jurisdiction of organization of each Subsidiary of Seagull and the
jurisdictions in which each such Subsidiary is qualified or holds licenses to do
business as a foreign corporation or other organization as of the date hereof.
Each of Seagull's Subsidiaries is a corporation duly organized, validly existing
and in good standing under the laws of its jurisdiction of incorporation, is
duly qualified to do business as a foreign corporation and is in good standing
in the jurisdictions set forth in Section 5.1(b) of the Seagull Disclosure
Schedule, which includes each jurisdiction in which the character of such
Subsidiary's properties or the nature of its business makes such qualification
necessary, except in jurisdictions, if any, where the failure to be so qualified
would not result in a Seagull Material Adverse Effect. Each of Seagull's
Subsidiaries has all requisite corporate or other power and authority to own,
use or lease its properties and to carry on its business as it is now being
conducted and as it is now proposed to be conducted. Seagull has made available
to OEI a complete and correct copy of the certificate of incorporation and
bylaws (or similar organizational documents) of each of Seagull's Subsidiaries,
each as amended to date, and the certificate of incorporation and bylaws (or
similar charter documents) as so delivered are in full force and effect. No
Subsidiary of Seagull is 



                                       22

<PAGE>   28
in default in any respect in the performance, observation or fulfillment of any
provision of its certificate of incorporation or bylaws (or similar
organizational documents). Other than Seagull's Subsidiaries, Seagull does not
beneficially own or control, directly or indirectly, 5% or more of any class of
equity or similar securities of any corporation or other organization, whether
incorporated or unincorporated.

                  (c) For purposes of this Agreement, a "Seagull Material
Adverse Effect" shall mean any event, circumstance, condition, development or
occurrence causing, resulting in or having (or with the passage of time likely
to cause, result in or have) a material adverse effect on the financial
condition, business, assets, properties, prospects or results of operations of
Seagull and its Subsidiaries, taken as a whole; provided, that such term shall
not include effects that are not applicable primarily to Seagull resulting from
market conditions generally in the oil and gas industry.

         Section 5.2  Capitalization.

                  (a) The authorized capital stock of Seagull consists of
100,000,000 shares of Seagull Common Stock, and 5,000,000 shares of preferred
stock of Seagull, par value $1.00 per share, of which 500,000 shares have been
designated as Series B Junior Participating Preferred Stock. As of the date of
this Agreement, Seagull has (i) 63,448,037 shares of Seagull Common Stock issued
and outstanding, (ii) no shares of preferred stock outstanding and (iii)
outstanding stock options to acquire 5,575,118 shares of Seagull Common Stock
under all stock option plans and agreements of Seagull. All such shares have
been validly issued, fully paid and nonassessable, and free of preemptive
rights. Except as set forth above, and other than this Agreement and other than
the Preferred Stock Purchase Rights set forth in the Amended and Restated Rights
Agreement dated as of December 12, 1997, by and between Seagull and BankBoston,
N.A., as Rights Agent (as amended, the "Seagull Rights Plan"), there are no
outstanding subscriptions, options, rights, warrants, convertible securities,
stock appreciation rights, phantom equity, or other agreements or commitments
obligating Seagull to issue, transfer, sell, redeem, repurchase or otherwise
acquire any shares of its capital stock of any class. Except for any amendments
filed with the Seagull SEC Reports (as defined below), the Seagull Rights Plan
has not been amended, and no amendment thereof is proposed. No "Distribution
Date" has occurred within the meaning of the Seagull Rights Plan, and the
consummation of the transactions contemplated hereby will not result in the
occurrence of a Distribution Date. Seagull has taken all action required to
render the Seagull Rights Plan (and the "Rights" thereunder) inapplicable to
this Agreement and the transactions contemplated hereby, including any Ancillary
Agreements.

                  (b) Except as set forth in Section 5.1(b) of the Seagull
Disclosure Schedule, Seagull is, directly or indirectly, the record and
beneficial owner of all of the outstanding shares of capital stock of each
Seagull Subsidiary, there are no irrevocable proxies with respect to any such
shares, and no equity securities of any Seagull Subsidiary are or may become
required to be issued by reason of any options, warrants, rights to subscribe
to, calls or commitments of any character whatsoever relating to, or securities
or rights convertible into or exchangeable or exercisable for, shares of any
capital stock of any Seagull Subsidiary, and there are no contracts,
commitments, understandings or arrangements by which Seagull or any Seagull
Subsidiary is or may be bound to issue additional shares of capital stock of any
Seagull Subsidiary or securities convertible into or exchangeable or exercisable
for any such shares. All of such shares so owned by Seagull are validly issued,
fully paid and nonassessable and are owned by it free and clear of all Liens.


                                       23

<PAGE>   29
         Section 5.3 Authority. Seagull has full corporate power and authority
to execute and deliver this Agreement and the Ancillary Agreements to which it
is or will be a party and, subject to obtaining the Seagull Stockholders'
Approval as contemplated by Section 7.13, to consummate the transactions
contemplated hereby and thereby. The execution, delivery and performance of this
Agreement and the Ancillary Agreements to which it is or will be a party and the
consummation of the transactions contemplated hereby and thereby have been duly
and validly authorized by the Board of Directors of Seagull (with at least
two-thirds of the members of the Board of Directors of Seagull voting in favor
thereof), and no other corporate proceedings on the part of Seagull are
necessary to authorize this Agreement or the Ancillary Agreements to which any
of them are or will be a party or to consummate the transactions contemplated
hereby or thereby, other than obtaining the Seagull Stockholders' Approval as
contemplated by Section 7.13 hereof. This Agreement has been, and the Ancillary
Agreements to which Seagull is or will be a party are, or upon execution will
be, duly and validly executed and delivered by Seagull and, assuming the due
authorization, execution and delivery hereof and thereof by the other parties
hereto and thereto, constitutes or upon execution will constitute, valid and
binding obligations of Seagull enforceable against Seagull in accordance with
their respective terms, except for the Enforceability Exception.

         Section 5.4 Consents and Approvals; No Violation. The execution and
delivery of this Agreement, the consummation of the transactions contemplated
hereby and the performance by Seagull of its obligations hereunder will not:

                  (a) subject to the obtaining the Seagull Stockholders'
Approval as contemplated by Section 7.13 hereof, conflict with any provision of
the articles of incorporation or bylaws of Seagull or the certificates of
incorporation or bylaws (or other similar organizational documents) of any of
its Subsidiaries;

                  (b) subject to obtaining the Seagull Stockholders' Approval as
contemplated by Section 7.13 hereof, require any consent, waiver, approval,
order, authorization or permit of, or registration, filing with or notification
to, (i) any Governmental Authority, except for applicable requirements of the
HSR Act, the Securities Act, the Exchange Act, state laws relating to takeovers,
if applicable, state securities or blue sky laws, laws, rules or regulations
administered by the APUC and Customary Post-Closing Consents or (ii) except as
set forth in Section 5.4(b) of the Seagull Disclosure Schedule, any third party
other than a Governmental Authority, other than such nonGovernmental Authority
third party consents, waivers, approvals, orders, authorizations and permits
that would not (i) result in a Seagull Material Adverse Effect, (ii) materially
impair the ability of Seagull or any of its Subsidiaries to perform its
obligations under this Agreement or any Ancillary Agreement or (iii) prevent the
consummation of any of the transactions contemplated by this Agreement;

                  (c) except as set forth in Section 5.4(c) of the Seagull
Disclosure Schedule, result in any violation of or the breach of or constitute a
default (with notice or lapse of time or both) under, or give rise to any right
of termination, cancellation or acceleration or guaranteed payments or a loss of
a material benefit under, any of the terms, conditions or provisions of any
note, lease, mortgage, 




                                       24

<PAGE>   30
license, agreement or other instrument or obligation to which Seagull or any of
its Subsidiaries is a party or by which Seagull or any of its Subsidiaries or
any of their respective properties or assets may be bound, except for such
violations, breaches, defaults, or rights of termination, cancellation or
acceleration, or losses as to which requisite waivers or consents have been
obtained or which, individually or in the aggregate, would not (i) result in a
Seagull Material Adverse Effect, (ii) materially impair the ability of Seagull
or any of its Subsidiaries to perform its obligations under this Agreement or
any Ancillary Agreement or (iii) prevent the consummation of any of the
transactions contemplated by this Agreement;

                  (d) violate the provisions of any order, writ, injunction,
judgment, decree, statute, rule or regulation applicable to Seagull or any
Subsidiary of Seagull;

                  (e) result in the creation of any Lien upon any material
properties or assets or on any shares of capital stock of Seagull or its
Subsidiaries under any agreement or instrument to which Seagull or any of its
Subsidiaries is a party or by which Seagull or any of its Subsidiaries or any of
their properties or assets is bound; or

                  (f) result in any holder of any securities of Seagull being
entitled to appraisal, dissenters' or similar rights.

         Section 5.5 Seagull Financial Statements. Each of the audited
consolidated financial statements and unaudited consolidated interim financial
statements of Seagull (including any related notes and schedules) included (or
incorporated by reference) in its Annual Reports on Form 10-K for each of the
three fiscal years ended December 31, 1995, 1996 and 1997 and its Quarterly
Report on Form 10-Q for its fiscal quarter ended September 30, 1998
(collectively, the "Financial Statements") have been prepared from, and are in
accordance with, the books and records of Seagull and its consolidated
Subsidiaries, comply in all material respects with applicable accounting
requirements and with the published rules and regulations of the SEC with
respect thereto, have been prepared in accordance with GAAP applied on a
consistent basis (except as may be indicated in the notes thereto and subject,
in the case of quarterly financial statements, to normal and recurring year-end
adjustments) and fairly present, in conformity with GAAP applied on a consistent
basis (except as may be indicated in the notes thereto), the consolidated
financial position of Seagull and its Subsidiaries as of the date thereof and
the consolidated results of operations and cash flows (and changes in financial
position, if any) of Seagull and its Subsidiaries for the periods presented
therein (subject to normal year-end adjustments and the absence of financial
footnotes in the case of any unaudited interim financial statements).

         Section 5.6 Absence of Undisclosed Liabilities. Except (a) as
specifically disclosed in the Seagull SEC Reports and (b) for liabilities and
obligations incurred in the ordinary course of business and consistent with past
practice since December 31, 1997, neither Seagull nor any of its Subsidiaries
has incurred any liabilities or obligations of any nature (contingent or
otherwise) that would have a Seagull Material Adverse Effect or would be
required by GAAP to be reflected on a consolidated balance sheet of Seagull and
its Subsidiaries or the notes thereto which is not so reflected.


                                       25

<PAGE>   31
         Section 5.7 Absence of Certain Changes. Except as contemplated by this
Agreement, as set forth in Section 5.7 of the Seagull Disclosure Schedule or
disclosed in the Seagull SEC Reports, since December 31, 1997 (a) Seagull and
its Subsidiaries have conducted their business in all material respects in the
ordinary course consistent with past practices, (b) there has not been any
change or development, or combination of changes or developments that,
individually or in the aggregate, would have a Seagull Material Adverse Effect,
(c) there has not been any declaration, setting aside or payment of any dividend
or other distribution with respect to any shares of capital stock of Seagull or
any repurchase, redemption or other acquisition by Seagull or any of its
Subsidiaries of any outstanding shares of capital stock or other securities of,
or other ownership interests in, Seagull or any of its Subsidiaries, (d) there
has not been any amendment of any term of any outstanding security of Seagull,
and (e) there has not been any change in any method of accounting or accounting
practice by Seagull, except for any such change required by reason of a
concurrent change in GAAP or to conform a such accounting policies and practices
to those of Seagull.

         Section 5.8 Seagull SEC Reports. Seagull has filed with the SEC, and
has heretofore made available to OEI true and complete copies of, each form,
registration statement, report, schedule, proxy or information statement and
other document (including exhibits and amendments thereto), including without
limitation its Annual Reports to Shareholders incorporated by reference in
certain of such reports, required to be filed with the SEC since December 31,
1994 under the Securities Act or the Exchange Act (collectively, the "Seagull
SEC Reports"). As of the respective dates such Seagull SEC Reports were filed
or, if any such Seagull SEC Reports were amended, as of the date such amendment
was filed, each of the Seagull SEC Reports, including without limitation any
financial statements or schedules included therein, (a) complied in all
material respects with all applicable requirements of the Securities Act and the
Exchange Act, as the case may be, and the applicable rules and regulations
promulgated thereunder, and (b) did not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary in order to make the statements therein, in light of the circumstances
under which they were made, not misleading.

         Section 5.9 Taxes. Except as otherwise disclosed in Section 5.9 of the
Seagull Disclosure Schedule and for matters that would have no adverse effect on
Seagull:

                  (a) Seagull and each of its Subsidiaries have timely filed (or
have had timely filed on their behalf) or will file or cause to be timely filed,
all material Tax Returns required by applicable law to be filed by any of them
prior to or as of the Closing Date. All such Tax Returns and amendments thereto
are or will be true, complete and correct in all material respects.

                  (b) Seagull and each of its Subsidiaries have paid (or have
had paid on their behalf), or where payment is not yet due, have established (or
have had established on their behalf and for their sole benefit and recourse),
or will establish or cause to be established on or before the Closing Date, an
adequate accrual for the payment of all material Taxes due with respect to any
period ending prior to or as of the Closing Date.

                  (c) No Audit by a Tax Authority is pending or threatened with
respect to any Tax Returns filed by, or Taxes due from, Seagull or any
Subsidiary. No issue has been raised by any Tax Authority in any Audit of
Seagull or any of its Subsidiaries that if raised with respect to any other




                                       26

<PAGE>   32
period not so audited could be expected to result in a material proposed
deficiency for any period not so audited. No material deficiency or adjustment
for any Taxes has been threatened, proposed, asserted or assessed against
Seagull or any of its Subsidiaries. There are no liens for Taxes upon the assets
of Seagull or any of its Subsidiaries, except liens for current Taxes not yet
delinquent.

                  (d) Neither Seagull nor any of its Subsidiaries has given or
been requested to give any waiver of statutes of limitations relating to the
payment of Taxes or have executed powers of attorney with respect to Tax
matters, which will be outstanding as of the Closing Date.

                  (e) Prior to the date hereof, Seagull and its Subsidiaries
have disclosed, and provided or made available true and complete copies to OEI
of, all material Tax sharing, Tax indemnity, or similar agreements to which
Seagull or any of its Subsidiaries is a party to, is bound by, or has any
obligation or liability for Taxes.

         Section 5.10 Litigation. Except as disclosed in the Seagull SEC Reports
or Section 5.10 of the Seagull Disclosure Schedule and for matters that would
not have a Seagull Material Adverse Effect, there is no suit, claim, action,
proceeding or investigation pending or, to Seagull's knowledge, threatened
against or directly affecting Seagull, any Subsidiaries of Seagull or any of the
directors or officers of Seagull or any of its Subsidiaries in their capacity as
such, nor is there any reasonable basis therefor that could reasonably be
expected to have a Seagull Material Adverse Effect, if adversely determined.
Neither Seagull nor any of its Subsidiaries, nor any officer, director or
employee of Seagull or any of its Subsidiaries, has been permanently or
temporarily enjoined by any order, judgment or decree of any court or any other
Governmental Authority from engaging in or continuing any conduct or practice in
connection with the business, assets or properties of Seagull or such
Subsidiary, nor, to the knowledge of Seagull, is Seagull, any Subsidiary or any
officer, director or employee of Seagull or its Subsidiaries under investigation
by any Governmental Authority. Except as disclosed in the Seagull SEC Reports or
Section 5.10 of the Seagull Disclosure Schedule, there is not in existence any
order, judgment or decree of any court or other tribunal or other agency
enjoining or requiring Seagull or any of its Subsidiaries to take any action of
any kind with respect to its business, assets or properties. Notwithstanding the
foregoing, no representation or warranty in this Section 5.10 is made with
respect to Environmental Laws, which are covered exclusively by the provisions
set forth in Section 5.12.

         Section 5.11 Employee Benefit Plans; ERISA.

                  (a) Section 5.11(a) of the Seagull Disclosure Schedule
contains a true and complete list of the employee benefit plans or arrangements
of any type (including but not limited to plans described in section 3(3) of
ERISA), sponsored, maintained or contributed to by Seagull or any trade or
business, whether or not incorporated, which together with Seagull would be
deemed a "single employer" within the meaning of Section 414(b), (c) or (m) of
the Code or section 4001(b)(1) of ERISA (a "Seagull ERISA Affiliate") within six
years prior to the Effective Time ("Seagull Benefit Plans").

                  (b) With respect to each Seagull Benefit Plan: (i) if intended
to qualify under section 401(a) or 401(k) of the Code, such plan satisfies the
requirements of such sections, has received a favorable determination letter
from the Internal Revenue Service with respect to its qualification, and 



                                       27

<PAGE>   33
its related trust has been determined to be exempt from tax under section 501(a)
of the Code and, to the knowledge of Seagull, nothing has occurred since the
date of such letter to adversely affect such qualification or exemption; (ii)
each such plan has been administered in substantial compliance with its terms
and applicable law, except for any noncompliance with respect to any such plan
that could not reasonably be expected to result in a Seagull Material Adverse
Effect; (iii) neither Seagull nor any Seagull ERISA Affiliate has engaged in,
and Seagull and each Seagull ERISA Affiliate do not have any knowledge of any
person that has engaged in, any transaction or acted or failed to act in any
manner that would subject Seagull or any Seagull ERISA Affiliate to any
liability for a breach of fiduciary duty under ERISA that could reasonably be
expected to result in a Seagull Material Adverse Effect; (iv) no disputes are
pending, or, to the knowledge of Seagull or any Seagull ERISA Affiliate,
threatened; (v) neither Seagull nor any Seagull ERISA Affiliate has engaged in,
and Seagull and each Seagull ERISA Affiliate do not have any knowledge of any
person that has engaged in, any transaction in violation of Section 406(a) or
(b) of ERISA or Section 4975 of the Code for which no exemption exists under
Section 408 of ERISA or Section 4975(c) of the Code or Section 4975(d) of the
Code that could reasonably be expected to result in a Seagull Material Adverse
Effect; (vi) there have been no "reportable events" within the meaning of
Section 4043 of ERISA for which the 30 day notice requirement of ERISA has not
been waived by the PBGC; (vii) all contributions due have been made on a timely
basis (within, where applicable, the time limit established under section 302 of
ERISA or Code section 412); (viii) no notice of intent to terminate such plan
has been given under Section 4041 of ERISA and no proceeding has been instituted
under section 4042 of ERISA to terminate such plan; and (ix) except for defined
benefit plans (if applicable), such plan may be terminated on a prospective
basis without any continuing liability for benefits other than benefits accrued
to the date of such termination. All contributions made or required to be made
under any Seagull Benefit Plan meet the requirements for deductibility under the
Code, and all contributions which are required and which have not been made have
been properly recorded on the books of Seagull or a Seagull ERISA Affiliate.

                  (c) No Seagull Benefit Plan is a "multiemployer plan" (as
defined in section 4001(a)(3) of ERISA) or a "multiple employer plan" (within
the meaning of section 413(c) of the Code). No event has occurred with respect
to Seagull or a Seagull ERISA Affiliate in connection with which Seagull could
be subject to any liability, lien or encumbrance with respect to any Seagull
Benefit Plan or any employee benefit plan described in Section 3(3) of ERISA
maintained, sponsored or contributed to by a Seagull ERISA Affiliate under ERISA
or the Code.

                  (d) Except as set forth in Section 5.11(d) of the Seagull
Disclosure Schedule, no employees of Seagull or any of its Subsidiaries are
covered by any severance plan or similar arrangement.

         Section 5.12  Environmental Liability. Except as set forth in Section
5.12 of the Seagull Disclosure Schedule:

                  (a) The businesses of Seagull and its Subsidiaries have been
and are operated in material compliance with all Environmental Laws.





                                       28

<PAGE>   34
                  (b) Neither Seagull nor any of its Subsidiaries has caused or
allowed the generation, treatment, manufacture, processing, distribution, use,
storage, discharge, release, disposal, transport or handling of any Hazardous
Substances at any of its properties or facilities except in material compliance
with all Environmental Laws, and, to Seagull's knowledge, no generation,
manufacture, processing, distribution, use, treatment, handling, storage,
discharge, release, disposal, transport or handling of any Hazardous Substances
has occurred at any property or facility owned, leased or operated by Seagull or
any of its Subsidiaries except in material compliance with all Environmental
Laws.

                  (c) Neither Seagull nor any of its Subsidiaries has received
any written notice from any Governmental Authority or third party or, to the
knowledge of Seagull, any other communication alleging or concerning any
material violation by Seagull or any of its Subsidiaries of, or responsibility
or liability of Seagull or any of its Subsidiaries under, any Environmental Law.
There are no pending, or to the knowledge of Seagull, threatened, claims, suits,
actions, proceedings or investigations with respect to the businesses or
operations of Seagull or any of its Subsidiaries alleging or concerning any
material violation of or responsibility or liability under any Environmental Law
that, if adversely determined, could reasonably be expected to have a Seagull
Material Adverse Effect, nor does Seagull have any knowledge of any fact or
condition that could give rise to such a claim, suit, action, proceeding or
investigation.

                  (d) Seagull and its Subsidiaries are in possession of all
material approvals, permits, licenses, registrations and similar type
authorizations from all Governmental Authorities under all Environmental Laws
with respect to the operation of the businesses of Seagull and its Subsidiaries;
there are no pending or, to the knowledge of Seagull, threatened, actions,
proceedings or investigations seeking to modify, revoke or deny renewal of any
of such approvals, permits, licenses registrations and authorizations; and
Seagull does not have knowledge of any fact or condition that is reasonably
likely to give rise to any action, proceeding or investigation to modify, revoke
or deny renewal of any of such approvals, permits, licenses, registrations and
authorizations.

                  (e) Without in any way limiting the generality of the
foregoing, (i) to the knowledge of Seagull, all off-site locations where Seagull
or any of its Subsidiaries has transported, released, discharged, stored,
disposed or arranged for the disposal of pollutants, contaminants, hazardous
wastes or toxic substances are licensed disposal sites as required by law, (ii)
to Seagull's knowledge, all underground storage tanks, and the operating status,
capacity and contents of such tanks, located on any property owned, leased or
operated by Seagull or any of its Subsidiaries are identified in Section 5.12 of
the Seagull Disclosure Schedule and (iii) no PCBs or PCB-containing items are
used or stored at any property owned, leased or operated by Seagull or any of
its Subsidiaries except in compliance with Environmental Laws.

                  (f) There has been no discharge, release or disposal at any of
the properties owned or operated by Seagull, its Subsidiaries, or a predecessor
in interest, or to the knowledge of Seagull, at any disposal or treatment
facility which received Hazardous Substances generated by Seagull, its
Subsidiaries, or any predecessor in interest which could reasonably be expected
to result in liabilities that have a Seagull Material Adverse Effect.

                  (g) To Seagull's knowledge, no pending claims have been
asserted or threatened to be asserted against Seagull or its Subsidiaries for
any personal injury (including wrongful death) or property damage (real or
personal) arising out of exposure to Hazardous Substances used, handled,




                                       29

<PAGE>   35
generated, transported or disposed by Seagull or its Subsidiaries at property
owned or operated by Seagull or its Subsidiaries, except as could not reasonably
be expected to result in liabilities that have a Seagull Material Adverse
Effect.

         Section 5.13 Compliance with Applicable Laws. Seagull and each of its
Subsidiaries hold all material approvals, licenses, permits, registrations and
similar type authorizations necessary for the lawful conduct of its respective
businesses, as now conducted, and such businesses are not being, and neither
Seagull nor any of its Subsidiaries has received any notice from any
Governmental Authority or person that any such business has been or is being,
conducted in violation of any law, ordinance or regulation, including without
limitation any law, ordinance or regulation relating to occupational health and
safety, except for possible violations which either individually or in the
aggregate have not resulted and would not result in a Seagull Material Adverse
Effect; provided, however, notwithstanding the foregoing, no representation or
warranty in this Section 5.13 is made with respect to Environmental Laws, which
are covered exclusively by the provisions set forth in Section 5.12.

         Section 5.14 Insurance. Section 5.14 of the Seagull Disclosure Schedule
lists each of the insurance policies relating to Seagull or its Subsidiaries
which are currently in effect. Seagull has made available to OEI a true,
complete and correct copy of each such policy or the binder therefor. With
respect to each such insurance policy or binder none of Seagull, any of its
Subsidiaries or any other party to the policy is in breach or default thereunder
(including with respect to the payment of premiums or the giving of notices),
and Seagull does not know of any occurrence or any event which (with notice or
the lapse of time or both) would constitute such a breach or default or permit
termination, modification or acceleration under the policy, except for such
breaches or defaults which, individually or in the aggregate, would not result
in a Seagull Material Adverse Effect. Section 5.14 of the Seagull Disclosure
Schedule describes any self-insurance arrangements affecting Seagull or its
Subsidiaries. The insurance policies listed in Section 5.14 of the Seagull
Disclosure Schedule include all policies which are required in connection with
the operation of the businesses of Seagull and its Subsidiaries as currently
conducted by applicable laws and all agreements relating to Seagull and its
Subsidiaries.

         Section 5.15  Labor Matters; Employees.

                  (a) Except as set forth in Section 5.15(a) of the Seagull
Disclosure Schedule, (i) there is no labor strike, dispute, slowdown, work
stoppage or lockout actually pending or, to the knowledge of Seagull, threatened
against or affecting Seagull or any of its Subsidiaries and, during the past
five years, there has not been any such action, (ii) none of Seagull or any of
its Subsidiaries is a party to or bound by any collective bargaining or similar
agreement with any labor organization, or work rules or practices agreed to with
any labor organization or employee association applicable to employees of
Seagull or any of its Subsidiaries, (iii) none of the employees of Seagull or
any of its Subsidiaries are represented by any labor organization and none of
Seagull or any of its Subsidiaries have any knowledge of any current union
organizing activities among the employees of Seagull or any of its Subsidiaries
nor does any question concerning representation exist concerning such employees,
(iv) Seagull and its Subsidiaries have each at all times been in material
compliance with all applicable laws respecting employment and employment
practices, terms and conditions of employment, wages, hours of work and
occupational safety and health, and are not 




                                       30

<PAGE>   36
engaged in any unfair labor practices as defined in the National Labor Relations
Act or other applicable law, ordinance or regulation, (v) there is no unfair
labor practice charge or complaint against any of Seagull or any of its
Subsidiaries pending or, to the knowledge of Seagull, threatened before the
National Labor Relations Board or any similar state or foreign agency, (vi)
there is no grievance or arbitration proceeding arising out of any collective
bargaining agreement or other grievance procedure relating to Seagull or any of
its Subsidiaries, (vii) neither the Occupational Safety and Health
Administration nor any corresponding state agency has threatened to file any
citation, and there are no pending citations, relating to Seagull or any of its
Subsidiaries, and (viii) there is no employee or governmental claim or
investigation, including any charges to the Equal Employment Opportunity
Commission or state employment practice agency, investigations regarding Fair
Labor Standards Act compliance, audits by the Office of Federal Contractor
Compliance Programs, sexual harassment complaints or demand letters or
threatened claims.

                  (b) Except as set forth in Section 5.15(b) of the Seagull
Disclosure Schedule, since the enactment of the WARN Act, none of Seagull or any
of its Subsidiaries has effectuated (i) a "plant closing" (as defined in the
WARN Act) affecting any site of employment or one or more facilities or
operating units within any site of employment or facility of any of Seagull or
any of its Subsidiaries, or (ii) a "mass layoff" (as defined in the WARN Act)
affecting any site of employment or facility of Seagull or any of its
Subsidiaries, nor has Seagull or any of its Subsidiaries been affected by any
transaction or engaged in layoffs or employment terminations sufficient in
number to trigger application of any similar state or local law, in each case
that could reasonably be expected to have a Seagull Material Adverse Effect.

         Section 5.16  Reserve Reports.

                  (a) All information (including, without limitation, the
statement of the percentage of reserves from the oil and gas wells and other
interests evaluated therein to which Seagull or its Subsidiaries are entitled
and the percentage of the costs and expenses related to such wells or interests
to be borne by Seagull or its Subsidiaries) supplied to DeGolyer and McNaughton,
Netherland, Sewell & Associates, Inc. and Ryder Scott Company Petroleum
Engineers by or on behalf of Seagull and its Subsidiaries that was material to
such firms' estimates of proved oil and gas reserves attributable to the Oil and
Gas Interests of Seagull and its Subsidiaries in connection with the preparation
of the proved oil and gas reserve reports concerning the Oil and Gas Interests
of Seagull and its Subsidiaries as of December 31, 1997 by such engineering
firms (collectively, the "Seagull Reserve Report") was (at the time supplied or
as modified or amended prior to the issuance of the Seagull Reserve Report) true
and correct in all material respects and Seagull has no knowledge of any
material errors in such information that existed at the time of such issuance.
Except for changes (including changes in commodity prices) generally affecting
the oil and gas industry, there has been no change in respect of the matters
addressed in the Seagull Reserve Report that would have a Seagull Material
Adverse Effect.

                  (b) Set forth in Section 5.16(b) of the Seagull Disclosure
Schedule is a list of all material Oil and Gas Interests that were included in
the Seagull Reserve Report that have been disposed of prior to the date of this
Agreement.


                                       31

<PAGE>   37
         Section 5.17  Material Contracts.

                  (a) Set forth in Section 5.17(a) of the Seagull Disclosure
Schedule is a list of each contract, lease, indenture, agreement, arrangement or
understanding to which Seagull or any of its Subsidiaries is subject that is of
a type that would be required to be included as an exhibit to a Form S-1
Registration Statement pursuant to the rules and regulations of the SEC if such
a registration statement was filed by Seagull (the "Seagull Material
Contracts").

                  (b) Except as set forth in Section 5.17(a) or 5.17(b) of the
Seagull Disclosure Schedule, the Oil and Gas Interests of Seagull and its
Subsidiaries are not subject to (i) any instrument or agreement evidencing or
related to indebtedness for borrowed money, whether directly or indirectly, or
(ii) any agreement not entered into in the ordinary course of business in which
the amount involved is in excess of $500,000. With respect to the Oil and Gas
Interests of Seagull and its Subsidiaries, (A) all Seagull Material Contracts
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; (B) Seagull is not in material breach or default with respect to, and to
the knowledge of Seagull, no other party to any Seagull Material Contract is in
material breach or default with respect to, its obligations thereunder,
including with respect to payments or otherwise; (C) no party to any Seagull
Material Contract has given notice of any action to terminate, cancel, rescind
or procure a judicial reformation thereof; and (D) no Seagull Material Contract
contains any provision that prevents Seagull or any of its Subsidiaries from
owning, managing and operating the Oil and Gas Interests of Seagull and its
Subsidiaries in accordance with historical practices.

                  (c) As of the date of this Agreement, except as set forth in
Section 5.17(c) of the Seagull Disclosure Schedule, with respect to
authorizations for expenditure executed on or after January 1, 1996, (i) there
are no material outstanding calls for payments that are due or which Seagull or
its Subsidiaries are committed to make that have not been made; (ii) there are
no material operations with respect to which Seagull or its Subsidiaries have
become a non-consenting party; and (iii) there are no commitments for the
material expenditure of funds for drilling or other capital pro jects other than
projects with respect to which the operator is not required under the applicable
operating agreement to seek consent.

                  (d) Except as set forth in Section 5.17(d) of the Seagull
Disclosure Schedule, (i)) there are no provisions applicable to the Oil and Gas
Interests of Seagull and its Subsidiaries which increase the royalty percentage
of the lessor thereunder; and (ii) none of the Oil and Gas Interests of Seagull
and its Subsidiaries are limited by terms fixed by a certain number of years
(other than primary terms under oil and gas leases).

         Section 5.18 Permits. Immediately prior to the Effective Time and
except for Customary Post-Closing Consents, Seagull or its Subsidiaries will
hold all of the Permits required or necessary to construct, run, operate, use
and/or maintain their properties and conduct their operations as presently
conducted, except for such Permits, the lack of which, individually or in the
aggregate, would not have a Seagull Material Adverse Effect; provided, however,
that notwithstanding the foregoing, no representation or warranty in this
Section 5.18 is made with respect to Permits issued pursuant to Environmental
Laws, which are covered exclusively by the provisions set forth in Section 5.12.



                                       32

<PAGE>   38
         Section 5.19 Required Stockholder Vote or Consent. The only vote of the
holders of any class or series of Seagull's capital stock that will be necessary
to consummate the Merger and the other transactions contemplated by this
Agreement are (a) the approval of this Agreement by the holders of two-thirds of
the outstanding shares of Seagull Common Stock, and (b) the election of the
directors contemplated by Section 7.12 by the holders of a plurality of shares
of Seagull Common Stock represented in person or by proxy and voting with
respect thereto (collectively, the "Seagull Stockholders' Approval").

         Section 5.20 Proxy Statement/Prospectus; Registration Statement. None
of the information to be supplied by Seagull for inclusion in (a) the Proxy
Statement/Prospectus to be filed by OEI and Seagull with the SEC, and any
amendments or supplements thereto, or (b) the Registration Statement to be filed
by Seagull with the SEC in connection with the Merger, and any amendments or
supplements thereto, will, at the respective times such documents are filed,
and, in the case of the Proxy Statement/Prospectus, at the time the Proxy
Statement/Prospectus or any amendment or supplement thereto is first mailed to
stockholders of OEI and Seagull, at the time such stockholders vote on approval
and adoption of this Agreement and at the Effective Time, and, in the case of
the Registration Statement, when it becomes effective under the Securities Act,
contain any untrue statement of a material fact or omit to state any material
fact required to be made therein or necessary in order to make the statements
made therein, in light of the circumstances under which they were made, not
misleading.

         Section 5.21 Intellectual Property. Seagull or its Subsidiaries own, or
are licensed or other wise have the right to use, all Intellectual Property
currently used in the conduct of the business of Seagull and its Subsidiaries,
except where the failure to so own or otherwise have the right to use such
intellectual property would not, individually or in the aggregate, have a
Seagull Material Adverse Effect. No person has notified either Seagull or any of
its Subsidiaries that their use of the Intellectual Property infringes on the
rights of any person, subject to such claims and infringements as do not,
individually or in the aggregate, give rise to any liability on the part of
Seagull and its Subsidiaries that could have a Seagull Material Adverse Effect,
and, to Seagull's knowledge, no person is infringing on any right of Seagull or
any of its Subsidiaries with respect to any such Intellectual Property. No
claims are pending or, to Seagull's knowledge, threatened that Seagull or any of
its Subsidiaries is infringing or otherwise adversely affecting the rights of
any person with regard to any Intellectual Property.

         Section 5.22 Hedging. Section 5.22 of the Seagull Disclosure Schedule
sets forth for the periods shown obligations of Seagull and each of its
Subsidiaries for the delivery of Hydrocarbons attributable to any of the
properties of Seagull or any of its Subsidiaries in the future on account of
prepayment, advance payment, take-or-pay or similar obligations without then or
thereafter being entitled to receive full value therefor. Except as set forth in
Section 5.22 of the Seagull Disclosure Schedule, as of the date of this
Agreement, neither Seagull nor any of its Subsidiaries is bound by futures,
hedge, swap, collar, put, call, floor, cap, option or other contracts that are
intended to benefit from, relate to or reduce or eliminate the risk of
fluctuations in the price of commodities, including Hydrocarbons or securities.



                                       33

<PAGE>   39
         Section 5.23 Brokers. No broker, finder or investment banker (other
than Merrill Lynch, Pierce, Fenner & Smith Incorporated and Warburg Dillon Read
LLC, the fees and expenses of which will be paid by Seagull) is entitled to any
brokerage, finder's fee or other fee or commission payable by Seagull or any of
its Subsidiaries in connection with the transactions contemplated by this
Agreement based upon arrangements made by and on behalf of Seagull or any of its
Subsidiaries. True and correct copies of all agreements and engagement letters
currently in effect with Merrill Lynch, Pierce, Fenner & Smith Incorporated and
Warburg Dillon Read LLC (the "Seagull Engagement Letters") have been provided to
OEI.

         Section 5.24 Tax Matters. Neither Seagull nor, to the knowledge of
Seagull, any of its affiliates has taken or agreed to take any action that would
prevent the Merger from constituting a reorganization within the meaning of
section 368(a) of the Code. Without limiting the generality of the foregoing:

                  (a) In connection with the Merger, none of OEI Common Stock or
         OEI Preferred Stock will be acquired by Seagull or a person related (as
         defined in Treas. Reg. Section 1.368- 1(e)(3)) to Seagull for 
         consideration other than Seagull Common Stock or Seagull Preferred 
         Stock, respectively, except for any cash received in lieu of fractional
         share interests in Seagull Common Stock pursuant to Section 3.4 of this
         Agreement.

                  (b) Following the Merger, the Surviving Corporation will
         continue the historic business of OEI or use a significant portion of
         its assets in a business, within the meaning of Treas.
         Reg. Section 1.368-1(d).

                  (c) There is no intercorporate indebtedness existing between
         OEI and Seagull that was issued, acquired, or will be settled at a
         discount.

                  (d) Seagull will pay its own expenses incurred in connection
         with or as part of the Merger or related transactions. Seagull has not
         paid and will not pay, directly or indirectly, any expenses (including
         transfer taxes) incurred by any holder of OEI Common Stock or OEI
         Preferred Stock in connection with or as part of the Merger or any
         related transactions. Seagull has not agreed to assume, nor will it
         directly or indirectly assume, any expense or other liability, whether
         fixed or contingent, of any holder of OEI Common Stock or OEI Preferred
         Stock.

                  (e) Seagull is not an "investment company" within the meaning
         of section 368(a)(2)(F) of the Code.

                  (f) Seagull has no plan or intention to sell or otherwise
         dispose of any of the assets of OEI except for dispositions made in the
         ordinary course of business or transfers or successive transfers to one
         or more corporations controlled (within the meaning of section 368(c)
         of the Code) in each case by the transferor corporation, or to
         reacquire any of the Seagull Common Stock or Seagull Preferred Stock
         issued in the Merger.



                                       34

<PAGE>   40
         Section 5.25 Fairness Opinion. The Board of Directors of Seagull has
received written opinions from Merrill Lynch, Pierce, Fenner & Smith
Incorporated and Warburg Dillon Read LLC to the effect that, as of the date of
such opinions, the Common Stock Exchange Ratio is fair to the holders of Seagull
Common Stock from a financial point of view. A true and complete copy of such
opinions has been given to OEI.

         Section 5.26 Year 2000 Issues. The disclosures set forth in the Seagull
SEC Reports concerning potential computer hardware and software problems
associated with the Year 2000 are true and correct in all material respects.

         Section 5.27 Regulation as a Utility. Seagull is regulated as a public
utility by the APUC and in no other state and is considered a "public utility
company" under the Public Utility Holding Company Act of 1935, as amended ("1935
Act"). Alaska Pipeline Company, a wholly owned subsidiary of Seagull ("APC"), is
an interstate pipeline regulated together with ENSTAR Natural Gas Company, a
division of Seagull, by the APUC on a combined basis. Except as set forth in the
preceding sentences of this Section 5.27 and except that certain gathering
assets of Seagull are regulated by the Texas Railroad Commission, neither
Seagull nor any "subsidiary company" or "affiliate" (as each such term is
defined in the 1935 Act) of Seagull is subject to regulation as a public utility
or public service company (or similar designation) by the Federal Energy
Regulatory Commission or any municipality, locality, state in the United States
or any foreign country.

         Section 5.28 Takeover Laws. Seagull and the Board of Directors of
Seagull have each taken all action required to be taken by it in order to exempt
this Agreement, and the transactions contemplated hereby from, and this
Agreement and the transactions contemplated hereby are exempt from, the
requirements of any "moratorium," "control share," "fair price," "affiliate
transaction," "business combination" or other antitakeover laws and regulations
of any state, including, without limitation, the State of Texas, and including,
without limitation, Article Thirteen of the TBCA.

                                   ARTICLE VI

                     CONDUCT OF BUSINESS PENDING THE MERGER

         Section 6.1 Conduct of Business by OEI Pending the Merger. From the
date hereof until the Effective Time, unless Seagull shall otherwise agree in
writing, or except as set forth in the OEI Disclosure Schedule or as otherwise
contemplated by this Agreement, OEI and its Subsidiaries shall conduct their
business in the ordinary course consistent with past practice and shall use all
reasonable efforts to preserve intact their business organizations and
relationships with third parties and to keep available the services of their
present officers and key employees, subject to the terms of this Agreement.
Except as set forth in the OEI Disclosure Schedule or as otherwise provided in
this Agreement, and without limiting the generality of the foregoing, from the
date hereof until the Effective Time, without the written consent of Seagull,
which consent shall not be unreasonably withheld:

                  (a) Neither OEI nor its Subsidiaries will adopt or propose any
change to its certificate of incorporation or bylaws (or similar organizational
documents);


                                       35

<PAGE>   41
                  (b) OEI will not, and will not permit any of its Subsidiaries
to (i) declare, set aside or pay any dividend or other distribution with respect
to any shares of capital stock of OEI or its Subsidiaries (except for normal
quarterly dividends on the OEI Preferred Stock and intercompany dividends from
direct or indirect wholly owned subsidiaries) or (ii) repurchase, redeem or
otherwise acquire any outstanding shares of capital stock or other securities
of, or other ownership interests in, OEI or any of its Subsidiaries, other than
intercompany acquisitions of stock;

                  (c) OEI will not, and will not permit any of its Subsidiaries
to, merge or consolidate with any other person or acquire assets of any other
person for aggregate consideration in excess of $10 million, or enter a new line
of business or commence business operations in any country in which OEI is not
operating as of the date of this Agreement except for countries listed on
Section 6.1(c) of the OEI Disclosure Schedule;

                  (d) Except as set forth in Section 6.1(d) of the OEI
Disclosure Schedule, OEI will not, and will not permit any of its Subsidiaries
to, sell, lease, license or otherwise surrender, relinquish or dispose of any
assets or properties (other than among OEI and its direct and indirect wholly
owned Subsidiaries) with an aggregate fair market value exceeding $10 million
(other than sales of hydrocarbons in the ordinary course of business);

                  (e) OEI will not settle any material Audit, make or change any
material Tax election or file any material amended Tax Return;

                  (f) Except as otherwise permitted by this Agreement, OEI will
not issue any securities (whether through the issuance or granting of options,
warrants, rights or otherwise and except pursuant to existing obligations
disclosed in the OEI SEC Reports or the OEI Disclosure Schedule), enter into any
amendment of any term of any outstanding security of OEI or of any of its
Subsidiaries, incur any indebtedness except trade debt in the ordinary course of
business and debt pursuant to existing credit facilities or arrangements (except
as set forth in Section 6.1(f) of the OEI Disclosure Schedule), fail to make any
required contribution to any OEI Benefit Plan, increase compensation, bonus
(except as set forth in Section 6.1(f) of the OEI Disclosure Schedule) or other
benefits payable to, or modify or amend any employment agreements or severance
agreements with, any executive officer or former employee or enter into any
settlement or consent with respect to any pending litigation other than
settlements in the ordinary course of business;

                  (g) OEI will not change any method of accounting or accounting
practice by OEI or any of its Subsidiaries, except for any such change required
by GAAP;

                  (h) OEI will not take any action that would give rise to a
claim under the WARN Act or any similar state law or regulation because of a
"plant closing" or "mass layoff" (each as defined in the WARN Act);

                  (i) OEI will not amend or otherwise change the terms of the
OEI Engagement Letters, except to the extent that any such amendment or change
would result in terms more favorable to OEI;

                  (j) Except as set forth in Section 6.1(j) of the OEI
Disclosure Schedule, neither OEI nor any of its Subsidiaries will become bound
or obligated to participate in any operation, or consent to participate in any
operation, with respect to any Oil and Gas Interests that will individually cost
in excess of $3.5 million unless the operation is a currently existing
obligation of OEI or any of its Subsidiaries or necessary to extend, preserve or
maintain an Oil and Gas Interest;



                                       36

<PAGE>   42
                  (k) Neither OEI nor any of its Subsidiaries will (i) enter
into any futures, hedge, swap, collar, put, call, floor, cap, option or other
contracts that are intended to benefit from or reduce or eliminate the risk of
fluctuations in the price of commodities, including Hydrocarbons, or securities,
other than in the ordinary course of business in accordance with OEI's current
policies or (ii) enter into any fixed price commodity sales agreements with a
duration of more than three months;

                  (l) OEI will not, and will not permit any of its Subsidiaries
to (i) take, or agree or commit to take, any action that would make any
representation and warranty of OEI hereunder inaccurate in any respect at, or as
of any time prior to, the Effective Time or (ii) omit, or agree or commit to
omit, to take any action necessary to prevent any such representation or
warranty from being inaccurate in any respect at any such time;

                  (m) Neither OEI nor any of its Subsidiaries shall (A) adopt,
amend (other than amendments that reduce the amounts payable by OEI or any
Subsidiary, or amendments required by law to preserve the qualified status of an
OEI Benefit Plan) or assume an obligation to contribute to any employee benefit
plan or arrangement of any type or collective bargaining agreement or enter into
any employment, severance or similar contract with any person (including,
without limitation, contracts with management of OEI or any Subsidiaries that
might require that payments be made upon the consummation of the transactions
contemplated hereby) or amend any such existing contracts to increase any
amounts payable thereunder or benefits provided thereunder, (B) engage in any
transaction (either acting alone or in conjunction with any OEI Benefit Plan or
trust created thereunder) in connection with which OEI or any Subsidiary could
be subjected (directly or indirectly) to either a civil penalty assessed
pursuant to subsections (c), (i) or (l) of Section 502 of ERISA or a tax imposed
pursuant to Chapter 43 of Subtitle D of the Code, (C) terminate any OEI Benefit
Plan in a manner, or take any other action with respect to any OEI Benefit Plan,
that could result in the liability of OEI or any Subsidiary to any person, (D)
take any action that could adversely affect the qualification of any OEI Benefit
Plan or its compliance with the applicable requirements of ERISA, (E) fail to
make full payment when due of all amounts which, under the provisions of any OEI
Benefit Plan, any agreement relating thereto or applicable law, OEI or any
Subsidiary are required to pay as contributions thereto or (F) fail to file, on
a timely basis, all reports and forms required by federal regulations with
respect to any OEI Benefit Plan;

                  (n) Neither OEI nor any of its Subsidiaries will enter into
any commitment or agreement to license or purchase seismic data that will cost
in excess of $300,000, other than pursuant to agreements or commitments existing
on the date of this Agreement;

                  (o) OEI will not make any election under any of its stock
option plans to pay cash in exchange for terminating awards under such plans;
and

                  (p) OEI will not, and will not permit any of its Subsidiaries
to, agree or commit to do any of the foregoing.


                                       37

<PAGE>   43
         Section 6.2 Conduct of Business by Seagull Pending the Merger. From the
date hereof until the Effective Time, unless OEI shall otherwise agree in
writing, or except as set forth in the Seagull Disclosure Schedule or as
otherwise contemplated by this Agreement, Seagull shall conduct, and shall cause
its Subsidiaries to conduct, its business in the ordinary course consistent with
past practice and shall use, and shall cause its each of its Subsidiaries to
use, all reasonable efforts to preserve intact its business organizations and
relationships with third parties and to keep available the services of its key
employees, subject to the terms of this Agreement. Except as set forth in the
Seagull Disclosure Schedule or as otherwise provided in this Agreement, and
without limiting the generality of the foregoing, from the date hereof until the
Effective Time, without the written consent of OEI, which consent shall not be
unreasonably withheld:

                  (a) Seagull will not, and will not permit its Subsidiaries to,
adopt or propose any change to its articles of incorporation or bylaws (or
similar organizational documents), except to the extent required to establish as
a series of its preferred stock the Seagull Preferred Stock to be issued in the
Merger;

                  (b) Seagull will not, and will not permit any of its
Subsidiaries to (i) declare, set aside or pay any dividend or other distribution
with respect to any shares of capital stock of Seagull or (ii) repurchase,
redeem or otherwise acquire any outstanding shares of capital stock or other
securities of, or other ownership interests in, Seagull or any of its
Subsidiaries, other than intercompany acquisitions of stock;

                  (c) Seagull will not, and will not permit any of its
Subsidiaries to, merge or consolidate with any other person or acquire assets of
any other person for aggregate consideration in excess of $10 million, or enter
a new line of business or commence business operations in any country in which
Seagull is not operating as of the date of this Agreement;

                  (d) Except as set forth in Section 6.2(d) of the Seagull
Disclosure Schedule, Seagull will not and will not permit any of its
Subsidiaries to, sell, lease, license or otherwise surrender, relinquish or
dispose of any assets or properties (other than among Seagull and its direct and
indirect wholly owned Subsidiaries) with an aggregate fair market value
exceeding $10 million (other than sales of hydrocarbons in the ordinary course
of business);

                  (e) Seagull will not settle any material Audit, make or change
any material Tax election or file any material amended Tax Return;

                  (f) Except as otherwise permitted by this Agreement, Seagull
will not issue any securities (whether through the issuance or granting of
options, warrants, rights or otherwise and except pursuant to existing
obligations disclosed in the Seagull SEC Reports or the Seagull Disclosure
Schedule), enter into any amendment of any term of any outstanding security of
Seagull or of any of its Subsidiaries, incur any indebtedness except trade debt
in the ordinary course of business and debt pursuant to existing credit
facilities or arrangements, fail to make any required contribution to any
Seagull Benefit Plan, increase compensation, bonus (except as set forth in
Section 6.2(f) of the Seagull Disclosure Schedule) or other benefits payable to,
or modify or amend any employment agreements or severance agreements with, any
executive officer or former employee or enter into any settlement or consent
with respect to any pending litigation other than settlements in the ordinary
course of business;

                                       38

<PAGE>   44
                  (g) Seagull will not change any method of accounting or
accounting practice by Seagull or any of its Subsidiaries, except for any such
change required by GAAP; provided, however, that OEI acknowledges that, in
connection with the transactions contemplated by this Agreement, Seagull intends
to adopt the full cost method of accounting for its oil and gas activities;

                  (h) Seagull will not take any action that would give rise to a
claim under the WARN Act or any similar state law or regulation because of a
"plant closing" or "mass layoff" (each as defined in the WARN Act);

                  (i) Seagull will not amend or otherwise change the terms of
the Seagull Engagement Letters, except to the extent that any such amendment or
change would result in terms more favorable to Seagull;

                  (j) Neither Seagull nor any of its Subsidiaries will become
bound or obligated to participate in any operation, or consent to participate in
any operation, with respect to any Oil and Gas Interest that will individually
cost in excess of $3.5 million unless the operation is a currently existing
obligation of Seagull or any of its Subsidiaries or necessary to extend,
preserve or maintain an Oil and Gas Interest;

                  (k) Neither Seagull nor any of its Subsidiaries will (i) enter
into any futures, hedge, swap, collar, put, call, floor, cap, option or other
contracts that are intended to benefit from or reduce or eliminate the risk of
fluctuations in the price of commodities, including Hydrocarbons or securities,
other than in the ordinary course of business in accordance with Seagull's
current policies or (ii) enter into any fixed price commodity sales agreements
with a duration of more than three months;

                  (l) Seagull will not, and will not permit any of its
Subsidiaries to (i) take, or agree or commit to take, any action that would make
any representation and warranty of Seagull hereunder inaccurate in any respect
at, or as of any time prior to, the Effective Time or (ii) omit, or agree or
commit to omit, to take any action necessary to prevent any such representation
or warranty from being inaccurate in any respect at any such time;

                  (m) Neither Seagull nor any of its Subsidiaries shall (A)
adopt, amend (other than amendments that reduce the amounts payable by Seagull
or any Subsidiary, or amendments required by law to preserve the qualified
status of a Seagull Benefit Plan) or assume an obligation to contribute to any
employee benefit plan or arrangement of any type or collective bargaining
agreement or enter into any employment, severance or similar contract with any
person (including, without limitation, contracts with management of Seagull or
any Subsidiaries that might require that payments be made upon consummation of
the transactions contemplated hereby) or amend any such existing contracts to
increase any amounts payable thereunder or benefits provided thereunder, (B)
engage in any transaction (either acting alone or in conjunction with any
Seagull Benefit Plan or trust created thereunder) in connection with which
Seagull or any Subsidiary could be subjected (directly or indirectly) to either
a civil penalty assessed pursuant to subsections (c), (i) or (l) of 



                                       39

<PAGE>   45
Section 502 of ERISA or a tax imposed pursuant to Chapter 43 of Subtitle D of
the Code, (C) terminate any Seagull Benefit Plan in a manner, or take any other
action with respect to any Seagull Benefit Plan, that could result in the
liability of Seagull or any Subsidiary to any person, (D) take any action that
could adversely affect the qualification of any Seagull Benefit Plan or its
compliance with the applicable requirements or ERISA, (E) fail to make full
payment when due of all amounts which, under the provisions of any Seagull
Benefit Plan, any agreement relating thereto or applicable law, Seagull or any
Subsidiary are required to pay as contributions thereto or (F) fail to file, on
a timely basis, all reports and forms required by federal regulations with
respect to any Seagull Benefit Plan;

                  (n) Neither Seagull nor any of its Subsidiaries will enter
into any commitment or agreement to license or purchase seismic data that will
cost in excess of $300,000, other than pursuant to agreements or commitments
existing on the date of this Agreement;

                  (o) Seagull will not make any election under any of its stock
option plans to pay cash in exchange for terminating awards under such plans;
and

                  (p) Seagull will not, and will not permit any of its
Subsidiaries to, agree or commit to do any of the foregoing.

                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS

         Section 7.1 Access and Information. The parties shall each afford to
the other and to the other's financial advisors, legal counsel, accountants,
consultants, financing sources, and other authorized representatives access
during normal business hours throughout the period prior to the Effective Time
to all of its books, records, properties, contracts, leases, plants and
personnel and, during such period, each shall furnish promptly to the other (a)
a copy of each report, schedule and other document filed or received by it
pursuant to the requirements of federal or state securities laws, and (b) all
other information as such other party reasonably may request, provided that no
investigation pursuant to this Section 7.1 shall affect any representations or
warranties made herein or the conditions to the obligations of the respective
parties to consummate the Merger. Each party shall hold in confidence all
nonpublic information until such time as such information is otherwise publicly
available and, if this Agreement is terminated, each party will deliver to the
other all documents, work papers and other materials (including copies) obtained
by such party or on its behalf from the other party as a result of this
Agreement or in connection herewith, whether so obtained before or after the
execution hereof. Notwithstanding the foregoing, the Confidentiality Agreement
dated November 9, 1998 between Seagull and OEI (the "Confidentiality Agreement")
shall survive the execution and delivery of this Agreement.


                                       40

<PAGE>   46
         Section 7.2  Acquisition Proposals.

                  (a) From the date of this Agreement until the termination
hereof, Seagull and its Subsidiaries will not, and will cause their respective
officers, directors, employees or other agents not to, directly or indirectly,
(i) take any action to solicit, initiate or encourage any Seagull Acquisition
Proposal (as hereinafter defined) or (ii) engage in negotiations with, or
disclose any nonpublic information relating to Seagull or its Subsidiaries,
respectively, or afford access to their respective properties, books or records
to any person that may be considering making, or has made, a Seagull Acquisition
Proposal. Nothing contained in this Section 7.2(a) shall prohibit Seagull and
its Board of Directors from (i) taking and disclosing a position with respect to
a tender offer by a third party pursuant to Rules 14d-9 and 14e-2(a) promulgated
by the SEC under the Exchange Act, or (ii) furnishing information, including
without limitation nonpublic information to, or entering into negotiations with,
any person or entity that has indicated its willingness to make an unsolicited
bona fide proposal to acquire Seagull pursuant to a merger, consolidation, share
exchange, purchase of a substantial portion of the assets, business combination
or other similar transaction, if, and only to the extent that, (A) such
unsolicited bona fide proposal relating to a Seagull Acquisition Proposal is
made by a third party that the Board of Directors of Seagull determines in good
faith that the third party has the good faith intent to proceed with
negotiations to consider, and financial capability to consummate, such Seagull
Acquisition Proposal, (B) the Board of Directors of Seagull, after duly
considering the written advice of outside legal counsel to Seagull, determines
in good faith that such action is required for the Board of Directors of Seagull
to comply with its fiduciary duties to stockholders imposed by applicable law,
(C) contemporaneously with furnishing such information to, or entering into
discussions or negotiations with, such person or entity Seagull provides written
notice to OEI to the effect that it is furnishing information to, or entering
into discussions or negotiations with, such person or entity and (D) Seagull
uses all reasonable efforts to keep OEI informed in all material respects of the
status and terms of any such negotiations or discussions (including without
limitation the identity of the person or entity with whom such negotiations or
discussions are being held) and provides OEI copies of such written proposals
and any amendments or revisions thereto or correspondence related thereto;
provided, that OEI agrees to execute a confidentiality agreement, in form
reasonably acceptable to it, with respect to any such information delivered to
OEI pursuant to this clause (D), which confidentiality agreement shall be
subject to OEI's disclosure obligations arising under applicable law or
securities exchange regulations. The term "Seagull Acquisition Proposal" as used
herein means any offer or proposal for, or any indication of interest in, a
merger or other business combination directly or indirectly involving Seagull or
any Seagull Subsidiary or the acquisition of a substantial equity interest in,
or a substantial portion of the assets of, any such party, other than the
transactions contemplated by this Agreement.

                  (b) From the date of this Agreement until the termination
hereof, OEI and its Subsidiaries will not, and will cause their respective
officers, directors, employees or other agents not to, directly or indirectly,
(i) take any action to solicit, initiate or encourage any OEI Acquisition
Proposal (as hereinafter defined) or (ii) engage in negotiations with, or
disclose any nonpublic information relating to OEI or its Subsidiaries,
respectively, or afford access to their respective properties, books or records
to any person that may be considering making, or has made, an OEI Acquisition
Proposal. Nothing contained in this Section 7.2(b) shall prohibit OEI and its
Board of Directors from (i) taking and disclosing a position with respect to a
tender offer by a third party pursuant to Rules 14d-9 and 14e-2(a) promulgated
by the SEC under the Exchange Act, or (ii)



                                       41

<PAGE>   47
furnishing information, including without limitation nonpublic information to,
or entering into negotiations with, any person or entity that has indicated its
willingness to make an unsolicited bona fide proposal to acquire OEI pursuant to
a merger, consolidation, share exchange, purchase of a substantial portion of
the assets, business combination or other similar transaction, if, and only to
the extent that, (A) such unsolicited bona fide proposal relating to an OEI
Acquisition Proposal is made by a third party that the Board of Directors of OEI
determines in good faith that the third party has the good faith intent to
proceed with negotiations to consider, and financial capability to consummate,
such OEI Acquisition Proposal, (B) the Board of Directors of OEI, after duly
considering the written advice of outside legal counsel to OEI, determines in
good faith that such action is required for the Board of Directors of OEI to
comply with its fiduciary duties to stockholders imposed by applicable law, (C)
contemporaneously with furnishing such information to, or entering into
discussions or negotiations with, such person or entity OEI provides written
notice to Seagull to the effect that it is furnishing information to, or
entering into discussions or negotiations with, such person or entity and (D)
OEI uses all reasonable efforts to keep Seagull informed in all material
respects of the status and terms of any such negotiations or discussions
(including without limitation the identity of the person or entity with whom
such negotiations or discussions are being held) and provides Seagull copies of
such written proposals and any amendments or revisions thereto or correspondence
related thereto; provided, that Seagull agrees to execute a confidentiality
agreement, in form reasonably acceptable to it, with respect to any such
information delivered to Seagull pursuant to this clause (D), which
confidentiality agreement shall be subject to Seagull's disclosure obligations
arising under applicable law or securities exchange regulations. The term "OEI
Acquisition Proposal" as used herein means any offer or proposal for, or any
indication of interest in, a merger or other business combination directly or
indirectly involving OEI or any OEI Subsidiary or the acquisition of a
substantial equity interest in, or a substantial portion of the assets of, any
such party, other than the transactions contemplated by this Agreement.

         Section 7.3 Directors' and Officers' Indemnification and Insurance.

                  (a) For six years after the Effective Time, Seagull shall
indemnify, defend and hold harmless each person who is now, or has been at any
time prior to the date hereof or who becomes prior to the Effective Time, an
officer or director of OEI and its Subsidiaries or an employee of OEI or any of
its Subsidiaries who acts as a fiduciary under any of the OEI Benefit Plans
(each an "Indemnified Party") against all losses, claims, damages, liabilities,
fees and expenses (including reasonable fees and disbursements of counsel and
judgments, fines, losses, claims, liabilities and amounts paid in settlement
(provided that any such settlement is effected with the prior written consent of
Seagull, which will not be unreasonably withheld)) arising in whole or in part
out of actions or omissions in their capacity as such occurring at or prior to
the Effective Time to the full extent permitted under Texas law or Seagull's
articles of incorporation and bylaws and OEI's written indemnification
agreements in effect at the date hereof, including provisions therein relating
to the advancement of expenses incurred in the defense of any action or suit;
provided, that in the event any claim or claims are asserted or made within such
six-year period, all rights to indemnification in respect of any such claim or
claims shall continue until disposition of any and all such claims; and
provided, further, that any determination required to be made with respect to
whether an Indemnified Party's conduct complies with the standards set forth
under Texas law, Seagull's articles of incorporation or bylaws or such
agreements, as the case may be, shall be made by independent




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<PAGE>   48
counsel mutually acceptable to Seagull and the Indemnified Party; and provided,
further, that nothing herein shall impair any rights or obligations of any
Indemnified Party. In the event that any claim or claims are brought against any
Indemnified Party (whether arising before or after the Effective Time), such
Indemnified Party may select counsel for the defense of such claim, which
counsel shall be reasonably acceptable to OEI (if selected prior to the
Effective Time) and Seagull (if selected after the Effective Time).

                  (b) Seagull shall maintain OEI's existing officers' and
directors' liability insurance policy ("D&O Insurance") for a period of not less
than six years after the Effective Time, but only to the extent related to
actions or omissions prior to the Effective Time; provided, that Seagull may
substitute therefor policies of substantially similar coverage and amounts
containing terms no less advantageous to such former directors or officers;
provided further, that the aggregate amount of premiums to be paid with respect
to the maintenance of such D&O Insurance for such six year period shall not
exceed $2,500,000. Additionally, Seagull shall maintain the UMC D&O Policy as
currently in effect until March 27, 2003.

         Section 7.4 Further Assurances. Each party hereto agrees to use all
reasonable efforts to obtain all consents and approvals and to do all other
things necessary for the consummation of the transactions contemplated by this
Agreement. The parties agree to take such further action to deliver or cause to
be delivered to each other at the Closing and at such other times thereafter as
shall be reasonably agreed by such additional agreements or instruments as any
of them may reasonably request for the purpose of carrying out this Agreement
and agreements and transactions contemplated hereby and thereby. The parties
shall afford each other access to all information, documents, records and
personnel who may be necessary for any party to comply with laws or regulations
(including without limitation the filing and payment of taxes and handling tax
audits), to fulfill its obligations with respect to indemnification hereunder or
to defend itself against suits or claims of others. Seagull and OEI shall duly
preserve all files, records or any similar items of Seagull or OEI received or
obtained as a result of the Merger with the same care and for the same period of
time as it would preserve its own similar assets.

         Section 7.5  Expenses.

                  (a) Except as provided in paragraph (c) and Section 7.17, all
Expenses (as defined below) incurred by the parties hereto shall be borne solely
and entirely by the party that has incurred such Expenses; provided, however,
that if this Agreement is terminated for any reason, then the allocable share of
Seagull and OEI for all Expenses (including any fees and expenses of
accountants, experts, and consultants, but excluding the fees and expenses of
legal counsel and investment bankers) related to preparing, printing, filing and
mailing the Registration Statement, the Proxy Statement/Prospectus and all SEC
and other regulatory filing fees incurred in connection with the Registration
Statement, Proxy Statement/Prospectus and HSR, shall be allocated one-half each.

                  (b) "Expenses" as used in this Agreement shall include all
reasonable out-of-pocket expenses (including, without limitation, all reasonable
fees and expenses of counsel, accountants, investment bankers, experts and
consultants to a party hereto and its affiliates) incurred by a party or on its
behalf in connection with or related to the authorization, preparation,
negotiation, execution and performance of this Agreement, the preparation,
printing, filing and mailing of the Registration Statement, the Proxy
Statement/Prospectus, the solicitation of stockholder approvals, requisite HSR
filings and all other matters related to the consummation of the transactions
contemplated hereby.


                                       43

<PAGE>   49
                  (c) OEI agrees that, if (i) Seagull terminates this Agreement
pursuant to Section 10.1(g) or (ii) OEI or Seagull terminates this Agreement
pursuant to Section 10.1(h) or (iii) Seagull terminates this Agreement pursuant
to Section 10.1(d) or Seagull terminates this Agreement pursuant to Section
10.1(b) at a time that an OEI Breach (as defined in Section 10.01(d)) exists and
in each case described in clauses (i) and (iii) within nine months after the
termination of this Agreement (A) a transaction is consummated, which
transaction, if offered or proposed, would constitute an OEI Acquisition
Proposal, (B) a definitive agreement (the execution and delivery of which has
been authorized by the boards of directors, or comparable bodies, that would if
consummated constitute an OEI Acquisition Proposal) for such a transaction is
entered into or (C) (X) any person shall have acquired beneficial ownership or
the right to acquire beneficial ownership of, or any "group" (as such term is
defined under Section 13(d) of the Exchange Act and the rules and regulations
promulgated hereunder), shall have been formed that beneficially owns, or has
the right to acquire beneficial ownership of, outstanding shares of capital
stock of OEI then representing 50% or more of the combined power to vote
generally for the election of directors and (Y) the Board of Directors of OEI
has taken any action, including without limitation the redemption of the Rights
under the OEI Rights Plan, or the amendment, termination or similar action with
respect to the OEI Rights Plan for the benefit of such person, that facilitates
the acquisition by such person or group of such beneficial ownership, then upon
the first to occur of any such case OEI shall pay to Seagull a Termination Fee
of $30 million, plus the reasonably documented Expenses of Seagull up to $2.5
million. In no event shall any such Termination Fee be payable in the event that
the Seagull Board of Directors withdraws, modifies or changes its recommendation
of this Agreement or the Merger or the stockholders of Seagull fail to give the
Seagull Stockholders' Approval when the proposals contemplated thereby are
properly submitted to a vote at the Seagull Special Meeting or any postponement
or adjournment thereof.

                  (d) Seagull agrees that, if (i) OEI terminates this Agreement
pursuant to Section 10.1(i) or (ii) Seagull or OEI terminates this Agreement
pursuant to Section 10.1(j) or (iii) OEI terminates this Agreement pursuant to
Section 10.1(c) or OEI terminates this Agreement pursuant to Section 10.1(b) at
a time that a Seagull Breach (as defined in Section 10.01(c)) exists and in each
case described in clauses (i) and (iii) within nine months after the termination
of this Agreement (A) a transaction is consummated, which transaction, if
offered or proposed, would constitute a Seagull Acquisition Proposal, (B) a
definitive agreement (the execution and delivery of which has been authorized by
the boards of directors, or comparable bodies, that would if consummated
constitute a Seagull Acquisition Proposal) for such a transaction is entered
into or (C) (X) any person shall have acquired beneficial ownership or the right
to acquire beneficial ownership of, or any "group" (as such term is defined
under Section 13(d) of the Exchange Act and the rules and regulations
promulgated hereunder), shall have been formed that beneficially owns, or has
the right to acquire beneficial ownership of, outstanding shares of capital
stock of Seagull then representing 50% or more of the combined power to vote
generally for the election of directors and (Y) the Board of Directors of
Seagull has taken any action, including without limitation the redemption of the
Rights under the Seagull Rights Plan, or the amendment, termination or similar
action with respect to the Seagull Rights Plan for the benefit of such person,
that facilitates the acquisition by such person or group of such beneficial
ownership, then upon the first to occur of any 



                                       44

<PAGE>   50
such case Seagull shall pay to OEI a Termination Fee of $30 million, plus the
reasonably documented Expenses of OEI up to $2.5 million. In no event shall any
such Termination Fee be payable in the event that the OEI Board of Directors
withdraws, modifies or changes its recommendation of this Agreement or the
Merger or the stockholders of OEI fail to give the OEI Stockholders' Approval
when the proposals contemplated thereby are properly submitted to a vote at the
OEI Special Meeting or any postponement or adjournment thereof.

         Section 7.6 Cooperation. Subject to compliance with applicable law,
from the date hereof until the Effective Time, each of the parties hereto shall
confer on a regular and frequent basis with one or more representatives of the
other parties to report operational matters of materiality and the general
status of ongoing operations and shall promptly provide the other party or its
counsel with copies of all filings made by such party with any Governmental
Authority in connection with this Agreement and the transactions contemplated
hereby.

         Section 7.7 Publicity. Neither OEI, Seagull nor any of their respective
affiliates shall issue or cause the publication of any press release or other
announcement with respect to the Merger, this Agreement or the other
transactions contemplated hereby without the prior consultation of the other
party, except as may be required by law or by any listing agreement with a
national securities exchange and will use reasonable efforts to provide copies
of such release or other announcement to the other party hereto, and give due
consideration to such comments as such other party may have, prior to such
release.

         Section 7.8 Additional Actions. Subject to the terms and conditions of
this Agreement, each of the parties hereto agrees to use all reasonable efforts
to take, or cause to be taken, all action and to do, or cause to be done, all
things necessary, proper or advisable under applicable laws and regulations, or
to remove any injunctions or other impediments or delays, to consummate and make
effective the Merger and the other transactions contemplated by this Agreement,
subject, however, to the appropriate vote of stockholders of OEI and Seagull
required so to vote.

         Section 7.9 Filings. Each party hereto shall make all filings required
to be made by such party in connection herewith or desirable to achieve the
purposes contemplated hereby, and shall cooperate as needed with respect to any
such filing by any other party hereto.

         Section 7.10 Consents. Each of Seagull and OEI shall use all reasonable
efforts to obtain all consents necessary or advisable in connection with its
obligations hereunder.

         Section 7.11 Employee Matters; Benefit Plans. Seagull and OEI will
evaluate their personnel needs and consider continuing the employment of certain
employees of Seagull, OEI and its Subsidiaries on a case-by-case basis. Prior to
the Effective Time, Seagull shall cause (a) each Seagull stock option plan and
each Seagull severance agreement that contains a change of control provision and
Seagull's Management Stability Plan to be amended to provide that the
consummation of the transaction contemplated by this Agreement shall constitute
a change of control for purposes thereunder and (b) each other Seagull Benefit
Plan that is an employee pension benefit plan within the meaning of Section 3(2)
of ERISA (other than Seagull's Executive Supplemental Retirement Plan) to be
amended to provide that all participants shall have a 100% vested and
nonforfeitable interest in their accrued benefits thereunder as of the Effective
Time. Prior to the Effective Time,


                                       45
<PAGE>   51
OEI shall cause (a) each OEI stock option plan and each OEI severance agreement
that contains a change of control provision to be amended to provide that the
consummation of the transaction contemplated by this Agreement shall constitute
a change of control for purposes thereunder and (b) each other OEI Benefit Plan
that is an employee pension benefit plan within the meaning of Section 3(2) of
ERISA (other than OEI's Executive Supplemental Retirement Plan) to be amended to
provide that all participants shall have a 100% vested and nonforfeitable
interest in their accrued benefits thereunder as of the Effective Time. After
the Effective Time, Seagull will initially provide to any employees of Seagull,
OEI and its Subsidiaries who are employed by Seagull as of the Effective Time
(the "Retained Employees") the same base salary or wages provided to such
employees prior to the Effective Time, subject to such changes in base salary or
wages as shall be determined by Seagull after the Effective Time. Seagull shall
take all actions necessary or appropriate to permit the Retained Employees to
continue to participate from and after the Effective Time in the employee
benefit plans or arrangements in which such Retained Employees were
participating immediately prior to the Effective Time. Notwithstanding the
foregoing, Seagull may permit any such employee benefit plan or arrangement to
be terminated or discontinued on or after the Effective Time, provided that
Seagull shall (a) take all actions necessary or appropriate to permit the
Retained Employees participating in such employee benefit plan or arrangement to
immediately thereafter participate in employee benefit plans or arrangements
comparable to those maintained with respect to the remainder of the Retained
Employees (other than Seagull's Alaska division) (the "Replacement Plans"), (b)
with respect to a Replacement Plan that is a group health plan (i) credit such
Retained Employees, for the year during which participation in the Replacement
Plan begins, with any deductibles and copayments already incurred during such
year under the terminated or discontinued group health plan and (ii) waive any
preexisting condition limitations applicable to the Retained Employees (and
their eligible dependents) under the Replacement Plan to the extent that a
Retained Employee's (or dependent's) condition would not have operated as a
preexisting condition under the terminated or discontinued group health plan,
and (c)(1) cause each Replacement Plan that is an employee pension benefit plan
(as such term is defined in Section 3(2) of ERISA) intended to be qualified
under Section 401 of the Code to be amended to provide that the Retained
Employees shall receive credit for participation and vesting purposes under such
plan for their period of employment with Seagull, OEI, its Subsidiaries and
their predecessors to the extent such predecessor employment was recognized by
Seagull, OEI and its Subsidiaries and (2) credit the Retained Employees under
each other Replacement Plan that is not described in the preceding clause for
their period of employment with Seagull, OEI, its Subsidiaries and their
predecessors to the extent such predecessor employment was recognized by
Seagull, OEI or its Subsidiaries. At the Effective Time, Seagull shall assume
the obligations of OEI under the OEI Benefit Plans. The terms of each such OEI
Benefit Plan shall continue to apply in accordance with their terms. At the
Effective Time, each outstanding award (including restricted stock, phantom
stock, stock equivalents and stock units) ("OEI Award") under any employee
incentive or benefit plans, programs or arrangements and non-employee director
plans presently maintained by OEI which provide for grants of equity-based
awards shall be amended or converted into a similar instrument of Seagull, in
each case with such adjustments to the terms of such OEI Awards as are
appropriate to preserve the value inherent in such OEI Awards with no
detrimental effects on the holders thereof. The other terms of each OEI Award,
and the plans or agreements under which they were issued, shall continued to
apply in accordance with their terms.



                                       46

<PAGE>   52

         Section 7.12  Board, Committees and Executive Officers.

                  (a) Seagull shall take such action as shall be required to
cause the Board of Directors of Seagull immediately after the Effective Time to
have 15 members that are divided into three classes, Class I, Class II and Class
III, which classes shall have the respective terms set forth in Seagull's
Bylaws. Prior to the mailing to stockholders of the Proxy Statement/Prospectus,
(i) the Board of Directors of Seagull shall select from among the current
members of the Board of Directors of Seagull seven (7) individuals (the "Seagull
Director Nominees") for nomination as directors of Seagull, which nominees shall
include James T. Hackett and Barry J. Galt, and (ii) the Board of Directors of
OEI shall select from among the current members of the Board of Directors of OEI
eight (8) individuals (the "OEI Director Nominees") for nomination as directors
of Seagull, which nominees shall include John B. Brock, James C. Flores and
James L. Dunlap. The OEI Director Nominees and the Seagull Director Nominees
shall be nominated to stand for election as directors of Seagull at the Seagull
Special Meeting by at least two-thirds of the Board of Directors of Seagull. If
an individual so selected and nominated consents to serve as a director, Seagull
shall use all reasonable efforts to cause such individual to be elected to its
Board of Directors by the Seagull stockholders at the Seagull Special Meeting,
effective as of the Effective Time, for a term expiring at Seagull's next annual
meeting of stockholders following the Effective Time at which the term of the
class to which such director belongs expires, subject to being renominated as a
director at the discretion of Seagull's Board of Directors. Each class shall
consist of an equal, or as near as equal as possible, number of directors (as
provided in Seagull's articles of incorporation and the TBCA) and the specific
designation of OEI Director Nominees and Seagull Director Nominees to a
particular class shall be determined by OEI and Seagull prior to the mailing to
stockholders of the Proxy Statement/Prospectus; provided, however, that (i)
James T. Hackett shall be designated by the Board of Directors of Seagull as a
Class III Director and shall serve as President and Chief Executive Officer as
of the Effective Time until the earlier of his resignation or removal or until
his successor is duly elected and qualified in accordance with the bylaws of
Seagull in effect subsequent to the Effective Time and (ii) James C. Flores
shall be designated by the Board of Directors of OEI as a Class III Director and
shall serve as Chairman of the Board as of the Effective Time until the earlier
of his resignation or removal or until his successor is duly elected and
qualified in accordance with the bylaws of Seagull in effect subsequent to the
Effective Time. If at any time prior to the Effective Time, any OEI Director
Nominee or Seagull Director Nominee shall be unable to serve as a director at
the Effective Time, the respective Board of Directors that designated such
individual as provided herein shall designate another individual to serve in
such individual's place; provided that in the event James C. Flores is unable to
serve as Chairman of the Board, James T. Hackett shall serve as Chairman of the
Board as of the Effective Time until his successor is duly elected and qualified
in accordance with the bylaws of Seagull in effect subsequent to the Effective
Time; provided, further, in the event James T. Hackett is unable to serve as
President and Chief Executive Officer, James C. Flores shall serve as President
and Chief Executive Officer of the Company as of the Effective Time until his
successor is duly elected and qualified in accordance with the bylaws of Seagull
in effect subsequent to the Effective Time.

                  (b) The composition of the committees of the Board of
Directors of Seagull immediately subsequent to the Effective Time (including the
respective chairmen thereof) shall be as designated prior to the Effective Time
in the manner set forth below until the earlier of the resignation or removal of
any individual so designated or until their respective successors are duly




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<PAGE>   53
elected and qualified, as the case may be, it being agreed that if at any time
prior to the Effective Time any director nominee designated as a member of a
committee shall be unable to serve as a member of a committee (including as a
chairman of any committee) at the Effective Time, the respective Board of
Directors that designated such individual as provided herein (or in the case of
Messrs. Flores and Hackett, the respective Board of Directors on which they
presently serve) shall designate another individual to serve in such
individual's place. After the Effective Time, (i) a majority of the members of
the Executive Committee of the Seagull Board of Directors shall be OEI Director
Nominees and the chairman of such committee shall be a Seagull Director Nominee,
(ii) a majority of the members of the Audit Committee of the Seagull Board of
Directors shall be Seagull Director Nominees and the chairman of such committee
shall be a Seagull Director Nominee, (iii) a majority of the members of the
Compensation Committee of the Seagull Board of Directors shall be Seagull
Director Nominees and the chairman of such committee shall be an OEI Director
Nominee, and (iv) a majority of the members of the Nominating Committee of the
Seagull Board of Directors shall be OEI Director Nominees and the chairman of
such committee shall be an OEI Director Nominee.

                  (c) Subsequent to the Effective Time, those individuals set
forth on Exhibit 7.12(c) hereto shall be executive officers of Seagull having
the titles and positions set forth opposite their respective names on such
Exhibit until the earlier of the resignation or removal of any such individual
or until their respective successors are duly elected and qualified, as the case
may be. Prior to the Effective Time, Seagull and OEI may mutually agree to
designate additional individuals to serve as executive officers of Seagull
subsequent to the Effective Time. Subject to Section 7.12(a), if any executive
officer set forth on Exhibit 7.12(c) or designated in accordance with this
Section 7.12(c) ceases to be a full-time employee of either Seagull or OEI (or
otherwise declines to serve in such designated capacity) at or before the
Effective Time, Seagull and OEI will agree upon another person to serve in such
person's stead or agree to leave such office vacant through the Effective Time.

         Section 7.13  Stockholders Meetings.

                  (a) OEI shall, as promptly as reasonably practicable after the
date hereof (i) take all steps reasonably necessary to call, give notice of,
convene and hold a special meeting of its stockholders (the "OEI Special
Meeting") for the purpose of securing the OEI Stockholders' Approval, (ii)
distribute to its stockholders the Proxy Statement/Prospectus in accordance with
applicable federal and state law and with its certificate of incorporation and
bylaws, which Proxy Statement/Prospectus shall contain the recommendation of the
Board of Directors of OEI that its stockholders approve and adopt this Agreement
and the transactions contemplated hereby, (iii) use all reasonable efforts to
solicit from its stockholders proxies in favor of the approval and adoption of
the this Agreement and the transactions contemplated hereby and to secure the
OEI Stockholders' Approval, and (iv) cooperate and consult with Seagull with
respect to each of the foregoing matters; provided, that nothing contained in
this Section 7.13(a) shall prohibit the OEI Board of Directors from failing to
make or from withdrawing or modifying its recommendation to the OEI stockholders
hereunder if the Board of Directors of OEI, after consultation with and based
upon the written advice of independent legal counsel, determines in good faith
that such action is necessary for such Board of Directors to comply with its
fiduciary duties to its stockholders under applicable law.



                                       48

<PAGE>   54
                  (b) Seagull shall, as promptly as reasonably practicable after
the date hereof (i) take all steps reasonably necessary to call, give notice of,
convene and hold a special meeting of its stockholders (the "Seagull Special
Meeting") for the purpose of securing the Seagull Stockholders' Approval, (ii)
distribute to its stockholders the Proxy Statement/Prospectus in accordance with
applicable federal and state law and its articles of incorporation and bylaws,
which Proxy Statement/Prospectus shall contain the recommendation of the Seagull
Board of Directors that its stockholders approve this Agreement and the election
of directors described in Section 7.12 and (iii) use all reasonable efforts to
solicit from its stockholders proxies in favor of approval of this Agreement and
the election of directors described in Section 7.12 and to secure the Seagull
Stockholders' Approval, and (iv) cooperate and consult with OEI with respect to
each of the foregoing matters; provided, that nothing contained in this Section
7.13(b) shall prohibit the Seagull Board of Directors from failing to make or
from withdrawing or modifying its recommendation to the Seagull stockholders
hereunder if the Board of Directors of Seagull, after consultation with and
based upon the written advice of independent legal counsel, determines in good
faith that such action is necessary for such Board of Directors to comply with
its fiduciary duties to its stockholders under applicable law.

                  (c) The Seagull Special Meeting and the OEI Special Meeting
shall be held on the same day unless otherwise agreed by Seagull and OEI.

         Section 7.14 Preparation of the Proxy Statement/Prospectus and
Registration Statement.

                  (a) Seagull and OEI shall promptly prepare and file with the
SEC a preliminary version of the Proxy Statement/Prospectus and will use all
reasonable efforts to respond to the comments of the SEC in connection therewith
and to furnish all information required to prepare the definitive Proxy
Statement/Prospectus. At any time from (and including) the initial filing with
the SEC of the Proxy Statement/Prospectus, Seagull shall file with the SEC the
Registration Statement containing the Proxy Statement/Prospectus so long as
Seagull shall have provided to OEI a copy of the Registration Statement
containing the Proxy Statement/Prospectus at least ten days prior to any filing
thereof and any supplement or amendment at least two days prior to any filing
thereof. Subject to the foregoing sentence, the date that the Registration
Statement is filed with the SEC shall be determined jointly by Seagull and OEI.
Each of Seagull and OEI shall use all reasonable efforts to have the
Registration Statement declared effective under the Securities Act as promptly
as practicable after such filing. Seagull shall also take any action (other than
qualifying to do business in any jurisdiction in which it is not now so
qualified or filing a general consent to service of process in any jurisdiction)
required to be taken under any applicable state securities laws in connection
with the issuance of Seagull Common Stock in the Merger and OEI shall furnish
all information concerning OEI and the holders of shares of OEI capital stock as
may be reasonably requested in connection with any such action. Promptly after
the effectiveness of the Registration Statement, each of Seagull and OEI shall
cause the Proxy Statement/Prospectus to be mailed to its respective
stockholders, and if necessary, after the definitive Proxy Statement/Prospectus
shall have been mailed, promptly circulate amended, supplemented or supplemental
proxy materials and, if required in connection therewith, resolicit proxies.
Seagull shall advise OEI and OEI shall advise Seagull, as applicable, promptly
after it receives notice thereof, of the time when the Registration Statement
shall become effective or any supplement or amendment has been filed, the
issuance of any stop order, the suspension of the qualification of the Seagull
Common Stock for offering or sale in any 




                                       49

<PAGE>   55
jurisdiction, or any request by the SEC for amendment of the Proxy
Statement/Prospectus or the Registration Statement or comments thereon and
responses thereto or requests by the SEC for additional information.

                  (b) Following receipt by KPMG Peat Marwick LLP, Seagull's
independent auditors, of an appropriate request from OEI pursuant to SAS No. 72,
Seagull shall use all reasonable efforts to cause to be delivered to OEI a
letter of KPMG Peat Marwick LLP, dated a date within two business days before
the effective date of the Registration Statement, and addressed to OEI, in form
and substance reasonably satisfactory to OEI and customary in scope and
substance for "cold comfort" letters delivered by independent public accountants
in connection with registration statements and proxy statements similar to the
Proxy Statement/Prospectus.

                  (c) Following receipt by Arthur Andersen LLP, OEI's
independent auditors, of an appropriate request from Seagull pursuant to SAS No.
72, OEI shall use all reasonable efforts to cause to be delivered to Seagull a
letter of Arthur Andersen LLP, dated a date within two business days before the
effective date of the Registration Statement, and addressed to Seagull, in form
and substance satisfactory to Seagull and customary in scope and substance for
"cold comfort" letters delivered by independent public accountants in connection
with registration statements and proxy statements similar to the Proxy
Statement/Prospectus.

         Section 7.15 Stock Exchange Listing. Seagull shall use all reasonable
efforts to cause the Seagull Common Stock to be issued in the Merger to be
approved for listing on the New York Stock Exchange (the "NYSE") prior to the
Effective Time, in each case, subject to official notice of issuance and shall
use all reasonable efforts (with OEI's cooperation) to assume OEI's NYSE ticker
symbol.

         Section 7.16 Notice of Certain Events. Each party to this Agreement
shall promptly as reasonably practicable notify the other parties hereto of:

                           (i) any notice or other communication from any Person
         alleging that the consent of such Person (or other Person) is or may be
         required in connection with the transactions contemplated by this
         Agreement;

                           (ii) any notice or other communication from any
         Governmental Authority in connection with the transactions contemplated
         by this Agreement;

                           (iii) any actions, suits, claims, investigations or
         proceedings commenced or, to the best of its knowledge, threatened
         against, relating to or involving or otherwise affecting it or any of
         its Subsidiaries which, if pending on the date of this Agreement, would
         have been required to have been disclosed pursuant to Sections 4.10,
         4.12, 5.10 or 5.12 or which relate to the consummation of the
         transactions contemplated by this Agreement;


                                       50

<PAGE>   56
                           (iv) any notice of, or other communication relating
         to, a default or event that, with notice or lapse of time or both,
         would become a default, received by it or any of its Subsidiaries
         subsequent to the date of this Agreement, under any material agreement;
         and

                           (v) any OEI Material Adverse Effect or Seagull
         Material Adverse Effect or the occurrence of any event which is
         reasonably likely to result in an OEI Material Adverse Effect or a
         Seagull Material Adverse Effect, as the case may be.

         Section 7.17 Site Inspections. Subject to compliance with applicable
law (including applicable Environmental Laws), from the date hereof until the
Effective Time, each of the parties hereto may undertake (at that party's sole
cost and expense) an environmental assessment or assessments (an "Assessment")
of any other party's operations, business and/or properties that are the subject
of this Agreement. An Assessment may include, but not be limited to, a review of
permits, files and records, as well as visual and physical inspections and
testing. Before conducting an Assessment, the party intending to conduct such
Assessment (the "Inspecting Party") shall confer with the party whose
operations, business or property is the subject of such Assessment (the
"Inspected Party") regarding the nature, scope and scheduling of such
Assessment, and shall comply with such conditions as the Inspected Party may
reasonably impose to avoid interference with the Inspected Party's operations or
business. The Inspected Party shall cooperate in good faith with the Inspecting
Party's effort to conduct an Assessment.

         Section 7.18  Affiliate Agreements; Tax Treatment.

                  (a) OEI shall identify in a letter to Seagull all persons who
are, on the date hereof, "affiliates" of OEI, as such term is used in Rule 145
under the Securities Act. OEI shall use all reasonable efforts to cause its
respective affiliates to deliver to Seagull not later than 10 days prior to the
date of the OEI Special Meeting, a written agreement substantially in the form
attached hereto as Exhibit 7.18, and shall use all reasonable efforts to cause
persons who become "affiliates" after such date but prior to the Closing Date to
execute and deliver agreements at least 5 days prior to the Closing Date.

                  (b) Each party hereto shall use all reasonable efforts to
cause the Merger to qualify, and shall not take, and shall use all reasonable
efforts to prevent any subsidiary of such party from taking, any actions which
could prevent the Merger from qualifying, as a reorganization under the
provisions of Section 368(a) of the Code.

         Section 7.19 Stockholder Litigation. Each of Seagull and OEI shall give
the other the reasonable opportunity to participate in the defense of any
litigation against Seagull or OEI, as applicable, and its directors relating to
the transactions contemplated by this Agreement.


                                       51

<PAGE>   57
         Section 7.20 Indenture Matters. Seagull and OEI shall, and shall cause
their respective Subsidiaries to, take all actions that are necessary or
appropriate (as mutually agreed by Seagull and OEI) in order for Seagull, OEI
and certain of their Subsidiaries, as applicable, to assume, guarantee or modify
as appropriate the agreements governing the outstanding publicly held debt
securities of OEI, Seagull and APC referred to in the OEI SEC Reports and the
Seagull SEC Reports in order to avoid defaults thereunder.

         Section 7.21 Credit Facility. Seagull and OEI shall use all reasonable
efforts, and shall cooperate, to obtain as promptly as practicable commitments
from financing sources to refinance the existing bank credit facilities of OEI,
Seagull and their respective Subsidiaries (excluding, in the case of OEI, Havre
Pipeline Company L.L.C.).

         Section 7.22 Seagull Rights Plan. On or prior to the termination date
of the Seagull Rights Plan, Seagull shall take all actions as shall be necessary
to extend the term of the Seagull Rights Plan for a period of ten years or to
adopt a new stockholders' right plan with such terms and conditions as are
reasonably acceptable to OEI.

         Section 7.23 Registration Rights Agreements. The Registration Rights
Agreement dated as of August 11, 1996, as amended, among OEI, James C. Flores
and the Flores Family Limited Partnership and the Registration Rights Agreement
dated as of August 11, 1996, as amended, among OEI, William W. Rucks, IV and the
Rucks Family Limited Partnership, shall be assumed by Seagull as of the
Effective Time and shall apply to the Seagull Common Stock to be substituted for
the OEI Common Stock to which such agreements apply.

         Section 7.24 Employment Agreements and Severance Agreements. Seagull
shall assume the obligations under the employment agreements and severance
agreements to which OEI is a party or is otherwise subject, to the extent such
agreements are listed on Section 4.11 of the OEI Disclosure Schedule.

                                  ARTICLE VIII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

         Section 8.1 Conditions to the Obligation of Each Party. The respective
obligations of each party to effect the Merger shall be subject to the
fulfillment at or prior to the Effective Time of the following conditions:

                  (a) The OEI Stockholders' Approval and the Seagull
Stockholders' Approval shall have been obtained.

                  (b) No action, suit or proceeding instituted by any
Governmental Authority shall be pending and no statute, rule or regulation and
no injunction, order, decree or judgment of any court or Governmental Authority
of competent jurisdiction shall be in effect, in each case which would prohibit,
restrain, enjoin or restrict the consummation of the Merger.


                                       52

<PAGE>   58
                  (c) The Registration Statement shall have become effective in
accordance with the provisions of the Securities Act and no stop order
suspending the effectiveness of the Registration Statement shall be in effect
and no proceeding for such purpose shall be pending before or threatened by the
SEC.

                  (d) Each of OEI and Seagull shall have obtained such permits,
authorizations, consents, or approvals required to consummate the transactions
contemplated hereby.

                  (e) The shares of Seagull Common Stock to be issued in the
Merger shall have been approved for listing on the NYSE, subject to official
notice of issuance.

                  (f) Any consent or approval required with respect to the
transactions contemplated by this Agreement from the APUC shall have been
obtained on terms reasonably satisfactory to Seagull and OEI.

                  (g) Any applicable waiting period under the HSR Act shall have
expired or been terminated.

         Section 8.2 Conditions to the Obligations of Seagull. The obligation of
Seagull to effect the Merger is subject to the satisfaction at or prior to the
Effective Time of the following conditions:

                  (a) OEI shall have performed in all material respects its
obligations under this Agreement required to be performed by it at or prior to
the Effective Time and the representations and warranties of OEI contained in
this Agreement, to the extent qualified with respect to materiality shall be
true and correct in all respects, and to the extent not so qualified shall be
true and correct in all material respects, in each case as of the date of this
Agreement and at and as of the Effective Time as if made at and as of such time,
except as expressly contemplated by the OEI Disclosure Letter or this Agreement
and except that the accuracy of representations and warranties that by their
terms speak as of the date of this Agreement or some other date will be
determined as of such date, and Seagull shall have received a certificate of the
Chief Executive Officer and Chief Financial Officer of OEI as to the
satisfaction of this condition.

                  (b) All proceedings to be taken by OEI in connection with the
transactions contemplated by this Agreement and all documents, instruments and
certificates to be delivered by OEI in connection with the transactions
contemplated by this Agreement shall be reasonably satisfactory in form and
substance to Seagull and its counsel.

                  (c) From the date of this Agreement through the Effective
Time, there shall not have occurred any change in the financial condition,
business, operations or prospects of OEI and its Subsidiaries, taken as a whole,
that would constitute an OEI Material Adverse Effect, other than any such change
that affects both Seagull and OEI in a substantially similar manner.

                  (d) Seagull shall have received an opinion from Vinson &
Elkins L.L.P. prior to the effectiveness of the Registration Statement to the
effect that (i) the Merger will constitute a reorganization under section 368(a)
of the Code, (ii) Seagull and OEI will each be a party to that reorganization,
and (iii) no gain or loss will be recognized by Seagull or OEI by reason of the
Merger.


                                       53
<PAGE>   59

         Section 8.3 Conditions to the Obligations of OEI. The obligation of OEI
to effect the Merger is subject to the satisfaction at or prior to the Effective
Time of the following conditions:

                  (a) Seagull shall have performed in all material respects its
obligations under this Agreement required to be performed by it at or prior to
the Effective Time and the representations and warranties of Seagull contained
in this Agreement, to the extent qualified with respect to materiality shall be
true and correct in all respects, and to the extent not so qualified shall be
true and correct in all material respects, in each case as of the date of this
Agreement and at and as of the Effective Time as if made at and as of such time,
except as expressly contemplated by the Seagull Disclosure Letter or this
Agreement and except that the accuracy of representations and warranties that by
their terms speak as of the date of this Agreement or some other date will be
determined as of such date, and OEI shall have received a certificate of the
Chief Executive Officer and Chief Financial Officer of Seagull as to the
satisfaction of this condition.

                  (b) All proceedings to be taken by Seagull in connection with
the transactions contemplated by this Agreement and all documents, instruments
and certificates to be delivered by Seagull in connection with the transactions
contemplated by this Agreement shall be reasonably satisfactory in form and
substance to OEI and its counsel.

                  (c) From the date of this Agreement through the Effective
Time, there shall not have occurred any change in the financial condition,
business, operations or prospects of Seagull and its Subsidiaries, taken as a
whole, that would constitute a Seagull Material Adverse Effect, other than any
such change that affects both Seagull and OEI in a substantially similar manner.

                  (d) OEI shall have received an opinion from Akin, Gump,
Strauss, Hauer & Feld, L.L.P. prior to the effectiveness of the Registration
Statement to the effect that (i) the Merger will constitute a reorganization
under section 368(a) of the Code, (ii) OEI and Seagull will each be a party to
that reorganization, and (iii) no gain or loss will be recognized by the
stockholders of OEI upon the receipt of shares of Seagull Common Stock in
exchange for shares of OEI Common Stock pursuant to the Merger except with
respect to any cash received in lieu of fractional share interests.

                  (e) The members of the Board of Directors of Seagull
immediately prior to the Effective Time who are not elected to the Board of
Directors of Seagull at the Seagull Special Meeting shall have resigned or been
removed from the Board of Directors of Seagull effective as of the Effective
Time.

                                   ARTICLE IX

                                    SURVIVAL

         Section 9.1 Survival of Representations and Warranties. The
representations and warranties of the parties contained in this Agreement shall
not survive the Effective Time.



                                       54
<PAGE>   60

         Section 9.2 Survival of Covenants and Agreements. The covenants and
agreements of the parties to be performed after the Effective Time contained in
this Agreement shall survive the Effective Time.


                                    ARTICLE X

                        TERMINATION, AMENDMENT AND WAIVER

         Section 10.1 Termination. This Agreement may be terminated at any time
prior to the Effective Time, whether before or after approval by the
stockholders of OEI or Seagull:

                  (a) by the mutual written consent of Seagull and OEI;

                  (b) by either Seagull or OEI if the Effective Time shall not
have occurred on or before April 14, 1999 (the "Termination Date"); provided
that either party may extend the Termination Date until no later than August 30,
1999 if (i) all the conditions to consummation of the Merger set forth in
Article VIII hereof have either been satisfied or are then capable of being
satisfied by such date, other than the condition set forth in Section 8.1(f),
and (ii) such party believes that there is a reasonable probability that such
condition will be satisfied by or before such extended Termination Date; and
provided, further, that the party seeking to terminate this Agreement pursuant
to this Section 10.1(b) shall not have breached in any material respect its
obligations under this Agreement in any manner that shall have proximately
contributed to the failure to consummate the Merger on or before the Termination
Date;

                  (c) by OEI if there has been a material breach by Seagull of
any representation, warranty, covenant or agreement set forth in this Agreement
which breach (if susceptible to cure) has not been cured in all material
respects within twenty business days following receipt by Seagull of notice of
such breach (an "Seagull Breach");

                  (d) by Seagull, if there has been a material breach by OEI of
any representation, warranty, covenant or agreement set forth in this Agreement
which breach (if susceptible to cure) has not been cured in all material
respects within twenty business days following receipt by OEI of notice of such
breach (an "OEI Breach");

                  (e) by either OEI or Seagull, if there shall be any applicable
law, rule or regulation that makes consummation of the Merger illegal or if any
judgment, injunction, order or decree of a court or other Governmental Authority
of competent jurisdiction shall restrain or prohibit the consummation of the
Merger, and such judgment, injunction, order or decree shall become final and
nonappealable;

                  (f) by either OEI or Seagull, if the stockholder approvals
referred to in Section 7.13 shall not have been obtained by reason of the
failure to obtain the requisite vote upon a vote at a duly held meeting of
stockholders or at any adjournment or postponement thereof;



                                       55
<PAGE>   61

                  (g) by Seagull, if (i) the Board of Directors of OEI
withdraws, modifies or changes its recommendation of this Agreement or the
Merger in a manner adverse to Seagull or shall have resolved to do any of the
foregoing or the Board of Directors of OEI shall have recommended to the
stockholders of OEI any OEI Acquisition Proposal or resolved to do so; or (ii) a
tender offer or exchange offer for outstanding shares of capital stock of OEI
then representing 50% or more of the combined power to vote generally for the
election of directors is commenced, and the Board of Directors of OEI does not,
within the applicable period required by law, recommend that stockholders not
tender their shares into such tender or exchange offer;

                  (h) by OEI or Seagull, if OEI accepts an OEI Superior Proposal
and makes payment as required pursuant to Section 7.5 of this Agreement and of
the Expenses for which OEI is responsible under Section 7.5 of this Agreement.
For purposes of this Agreement, "OEI Superior Proposal" means an unsolicited
bona fide proposal made by a third party relating to an OEI Acquisition Proposal
on terms that the Board of Directors of OEI determines it cannot reject in favor
of the Merger, based on applicable fiduciary duties and the advice of OEI's
outside counsel; provided, however, that OEI shall not be permitted to terminate
this Agreement pursuant to this Section 10.1(h) unless it has used all
reasonable efforts to provide Seagull with two business days prior written
notice of its intent to so terminate this Agreement together with a detailed
summary of the terms and conditions of such OEI Acquisition Proposal; provided
further, that prior to any such termination, OEI shall, and shall cause its
respective financial and legal advisors to, negotiate in good faith with Seagull
to make such adjustments in the terms and conditions of this Agreement as would
enable OEI to proceed with the transactions contemplated herein, and it is
acknowledged by Seagull that such negotiations with Seagull shall be conducted
in a manner consistent with the fiduciary duties of the OEI Board of Directors;

                  (i) by OEI, if (i) the Board of Directors of Seagull
withdraws, modifies or changes its recommendation of this Agreement or the
Merger in a manner adverse to OEI or shall have resolved to do any of the
foregoing or the Board of Directors of Seagull shall have recommended to the
stockholders of Seagull any Seagull Acquisition Proposal or resolved to do so;
or (ii) a tender offer or exchange offer for outstanding shares of capital stock
of Seagull then representing 50% or more of the combined power to vote generally
for the election of directors is commenced, and the Board of Directors of
Seagull does not, within the applicable period required by law, recommend that
stockholders not tender their shares into such tender or exchange offer;

                  (j) by Seagull or OEI, if Seagull accepts a Seagull Superior
Proposal and makes payment as required pursuant to Section 7.5 of this Agreement
and of the Expenses for which Seagull is responsible under Section 7.5 of this
Agreement. For purposes of this Agreement, "Seagull Superior Proposal" means an
unsolicited bona fide proposal made by a third party relating to a Seagull
Acquisition Proposal on terms that the Board of Directors of Seagull determines
it cannot reject in favor of the Merger, based on applicable fiduciary duties
and the advice of Seagull's outside counsel; provided, however, that Seagull
shall not be permitted to terminate this Agreement pursuant to this Section
10.1(j) unless it has used all reasonable efforts to provide OEI with two
business days prior written notice of its intent to so terminate this Agreement
together with a detailed summary of the terms and conditions of such Seagull
Acquisition Proposal; provided further, that prior to any such termination,
Seagull shall, and shall cause its respective financial and legal advisors to,
negotiate in good faith with OEI to make such adjustments in the terms and




                                       56
<PAGE>   62

conditions of this Agreement as would enable Seagull to proceed with the
transactions contemplated herein, and it is acknowledged by OEI that such
negotiations with OEI shall be conducted in a manner consistent with the
fiduciary duties of the Seagull Board of Directors.

         Section 10.2 Effect of Termination. In the event of termination of the
Agreement and the abandonment of the Merger pursuant to this Article X, all
obligations of the parties shall terminate, except the obligations of the
parties pursuant to this Section 10.2 and except for the provisions of Sections
7.5, 7.7, 11.8 and the last two sentences of Section 7.1, provided that nothing
herein shall relieve any party from liability for any breaches hereof.


                                   ARTICLE XI

                                  MISCELLANEOUS

         Section 11.1 Notices. All notices or communications hereunder shall be
in writing (including facsimile or similar writing) addressed as follows:

                  To Seagull:

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas 77002
                           Attention: James T. Hackett
                           Facsimile No.:  (713) 951-4790

                           With a copy to:

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605

                  To OEI:

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas 77002
                           Attention:  Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           With a copy to:

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343



                                       57
<PAGE>   63

Any such notice or communication shall be deemed given (i) when made, if made by
hand delivery, and upon confirmation of receipt, if made by facsimile, (ii) one
business day after being deposited with a next-day courier, postage prepaid, or
(iii) three business days after being sent certified or registered mail, return
receipt requested, postage prepaid, in each case addressed as above (or to such
other address as such party may designate in writing from time to time).

         Section 11.2 Separability. If any provision of this Agreement shall be
declared to be invalid or unenforceable, in whole or in part, such invalidity or
unenforceability shall not affect the remaining provisions hereof which shall
remain in full force and effect.

         Section 11.3 Assignment. This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective heirs, legal
representatives, successors, and assigns; provided, however, that neither this
Agreement nor any rights hereunder shall be assignable or otherwise subject to
hypothecation and any assignment in violation hereof shall be null and void.

         Section 11.4 Interpretation. The headings contained in this Agreement
are for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

         Section 11.5 Counterparts. This Agreement may be executed in one or
more counterparts, all of which shall be considered one and the same Agreement,
and shall become effective when one or more such counterparts have been signed
by each of the parties and delivered to each party.

         Section 11.6 Entire Agreement. This Agreement and the Confidentiality
Agreement represent the entire Agreement of the parties with respect to the
subject matter hereof and shall supersede any and all previous contracts,
arrangements or understandings between the parties hereto with respect to the
subject matter hereof.

         Section 11.7 Governing Law. This Agreement shall be construed,
interpreted, and governed in accordance with the laws of Texas, without
reference to rules relating to conflicts of law.

         Section 11.8 Attorneys' Fees. If any action at law or equity, including
an action for declaratory relief, is brought to enforce or interpret any
provision of this Agreement, the prevailing party shall be entitled to recover
reasonable attorneys' fees and expenses from the other party, which fees and
expenses shall be in addition to any other relief which may be awarded.

         Section 11.9 No Third Party Beneficiaries. Except as provided in
Section 7.3, no person or entity other than the parties hereto is an intended
beneficiary of this Agreement or any portion hereof.


                                       58
<PAGE>   64

         Section 11.10 Disclosure Schedules. The disclosures made on any
disclosure schedule, including the OEI Disclosure Schedule and the Seagull
Disclosure Schedule, with respect to any representation or warranty shall be
deemed to be made with respect to any other representation or warranty requiring
the same or similar disclosure to the extent that the relevance of such
disclosure to other representations and warranties is evident from the face of
the disclosure schedule. The inclusion of any matter on any disclosure schedule
will not be deemed an admission by any party that such listed matter is material
or that such listed matter has or would have an OEI Material Adverse Effect or a
Seagull Material Adverse Effect, as applicable.

         Section 11.11 Amendments and Supplements. At any time before or after
approval of the matters presented in connection with the Merger by the
respective stockholders of Seagull and OEI and prior to the Effective Time, this
Agreement may be amended or supplemented in writing by Seagull and OEI with
respect to any of the terms contained in this Agreement, except as otherwise
provided by law; provided, however, that following approval of this Agreement by
the stockholders of Seagull there shall be no amendment or change to the
provisions hereof with respect to the Common Stock Exchange Ratio that is
adverse to the stockholders of Seagull without further approval by the
stockholders of Seagull, and following approval and adoption of this Agreement
by the stockholders of OEI there shall be no amendment or change to the
provisions hereof with respect to the Common Stock Exchange Ratio that is
adverse to the stockholders of OEI without further approval by the stockholders
of OEI.

         Section 11.12 Extensions, Waivers, Etc. At any time prior to the
Effective Time, either party may: 

                  (a) extend the time for the performance of any of the 
obligations or acts of the other party;

                  (b) waive any inaccuracies in the representations and
warranties of the other party contained herein or in any document delivered
pursuant hereto; or

                  (c) subject to the proviso of Section 11.11 waive compliance
with any of the agreements or conditions of the other party contained herein.

         Notwithstanding the foregoing, no failure or delay by Seagull or OEI in
exercising any right hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right hereunder. Any agreement on the part
of a party hereto to any such extension or waiver shall be valid only if set
forth in an instrument in writing signed on behalf of such party.



                                       59

<PAGE>   65
         IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement as of the day and year first above written.


                           SEAGULL ENERGY CORPORATION


                           By: /s/ JAMES T. HACKETT
                              --------------------------------------
                               James T. Hackett
                               President and Chief Executive Officer



                           OCEAN ENERGY, INC.

                           By: /s/ JAMES C. FLORES
                              --------------------------------------
                               James C. Flores
                               President and Chief Executive Officer




                                       60

<PAGE>   66
                                                                EXHIBIT 7.12(C)

                               EXECUTIVE OFFICERS


James C. Flores - Chairman of the Board
James T. Hackett - President and Chief Executive Officer
James L. Dunlap - Vice Chairman
William L. Transier - Executive Vice President and Chief Financial Officer
Robert K. Reeves - Executive Vice President and General Counsel


<PAGE>   67
                                                                   EXHIBIT 7.18

                           FORM OF AFFILIATE AGREEMENT


Seagull Energy Corporation
1001 Fannin, Suite 1700
Houston, Texas 77002

Gentlemen:

         Reference is made to the Agreement and Plan of Merger (the "Merger
Agreement") dated as of November 24, 1998 between Seagull Energy Corporation, a
Texas corporation ("Seagull") and Ocean Energy, Inc., a Delaware corporation
("OEI"), pursuant to which OEI will be merged with and into Seagull. Pursuant to
the terms and conditions of the Merger Agreement, upon consummation of the
transactions contemplated thereby, each share of Common Stock, par value $.01
per share, of OEI owned by the undersigned as of the Effective Time (as defined
in the Merger Agreement) will be converted into and exchangeable for certain
shares of the common stock, par value $.10 per share, of Seagull (the "Seagull
Common Stock").

         The undersigned understands that the he may be deemed to be an
"affiliate" of OEI for purposes of Rule 145 promulgated under the Securities Act
of 1933, as amended (the "Act"). The undersigned is delivering this letter of
undertaking and commitment pursuant to Section 7.18 of the Merger Agreement.

         With respect to such shares of Seagull Common Stock as may be received
by the undersigned pursuant to the Merger Agreement (the "Shares"), the
undersigned represents to and agrees with Seagull that:

                  A. The undersigned will not make any offer to sell or any sale
         or other disposition of all or any part of the Shares in violation of
         the Act or the rules and regulations thereunder, including without
         limitation Rule 145, and will hold all the Shares subject to all
         applicable provisions of the Act and the rules and regulations
         thereunder.

                  B. The undersigned has been advised that the offering, sale
         and delivery of the Shares to the undersigned pursuant to the Merger
         Agreement will be registered under the Act on a Registration Statement
         on Form S-4. The undersigned has also been advised, however, that,
         since the undersigned may be deemed an "affiliate" of OEI, any public
         reoffering or resale by the undersigned of any of the Shares will,
         under current law, require either (i) the further registration under
         the Act of the Shares to be sold, (ii) compliance with Rule 145
         promulgated under the Act (permitting limited sales under certain
         circumstances) or (iii) the availability of another exemption from
         registration under the Act.



<PAGE>   68

                  C. The undersigned also understands that, if Seagull should
         deem it necessary to comply with the requirements of the Act, stop
         transfer instructions will be given to its transfer agents with respect
         to the Shares and that there will be placed on the certificates for the
         Shares, or any substitutions therefor, a legend stating in substance:

                           "The securities represented by this certificate were
                           issued in a transaction under Rule 145 promulgated
                           under the Securities Act of 1933, as amended (the
                           "Act"), and may be sold, transferred or otherwise
                           disposed of only upon receipt by the Corporation of
                           an opinion of counsel acceptable to it that the
                           securities are being sold in compliance with the
                           limitations of Rule 145 or that some other exemption
                           from registration under the Act is available, or
                           pursuant to a registration statement under the Act."

         Execution of this letter shall not be considered an admission on the
part of the undersigned that the undersigned is an "affiliate" of OEI for
purposes of Rule 145 under the Act or as a waiver of any rights the undersigned
may have to any claim that the undersigned is not such an affiliate on or after
the date of this letter.


                                             Very truly yours,



                                             --------------------------------
                                                       Signature

                                             --------------------------------
                                                          Name

                                             --------------------------------
                                                          Date



                                        2


<PAGE>   1

                                                                     EXHIBIT 4.1

                               AMENDMENT NO. 1 TO
                              AMENDED AND RESTATED
                                RIGHTS AGREEMENT

         This Amendment No. 1 to Amended and Restated Rights Agreement (this
"Amendment") is made effective as of the 24th day of November 1998. This
Amendment is an amendment to the Amended and Restated Rights Agreement, dated as
of March 17, 1989, as amended effective June 13, 1992, and amended and restated
as of December 12, 1997 (the "Rights Agreement"), between Seagull Energy
Corporation, a Texas corporation (the "Company"), and BankBoston, N.A. (as
successor to NCNB Texas National Bank) (the "Rights Agent").

                                    RECITALS

         WHEREAS, the Company proposes to enter into an Agreement and Plan of
Merger (the "Merger Agreement") dated as of the date hereof with Ocean Energy,
Inc. ("OEI") under which OEI will merge with and into the Company on the terms
set forth therein; and

         WHEREAS, in connection with the transactions contemplated by the Merger
Agreement, The Prudential Insurance Company of America, Barry J. Galt and James
T. Hackett have entered into voting agreements with OEI of even date herewith
under which such parties have among other things agreed to support the Merger
upon the terms and conditions set forth therein (collectively, the "Voting
Agreements"); and

         WHEREAS, pursuant to and in compliance with Section 26 of the Rights
Agreement, the Company and the Rights Agent wish to amend the Rights Agreement
to reflect the foregoing as set forth herein;

         NOW THEREFORE, the parties hereto agree as follows:

         Section 1. Amendments. Section 1(a) of the Rights Agreement is amended
by adding to the end thereof the following:

                  In addition, notwithstanding the first sentence of this
                  definition, Ocean Energy, Inc., a Delaware corporation
                  ("OEI"), shall not be deemed to be an "Acquiring Person" by
                  reason of any beneficial ownership of Common Shares resulting
                  from the rights granted to it under those certain Voting
                  Agreements dated as of November 24, 1998 between OEI and each
                  of The Prudential Insurance Company of America, Barry J. Galt
                  and James T. Hackett as referred to in the Agreement and Plan
                  of Merger dated as of November 24, 1998 between the Company
                  and OEI.

         Section 2. Remainder of Agreement Not Affected. Except set forth in
Section 1 hereof, the terms and provisions of the Rights Agreement remain in
full force and effect and are hereby ratified and confirmed.

<PAGE>   2


         Section 3. Authority. Each party represents that such party has full
power and authority to enter into this Amendment, and that this Amendment
constitutes a legal, valid and binding obligation of such party, enforceable
against such party in accordance with its terms.

         Section 4. Counterparts. This Amendment may be executed in one or more
counterparts, each of which shall be deemed to be an original, but all of which
shall constitute one and the same agreement.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and attested, all as of the day and year first above written.


Attest:                                    SEAGULL ENERGY CORPORATION



By:  /s/ William L. Transier               By:  /s/ James T. Hackett
   ------------------------------------       ----------------------------------
     William L. Transier                        James T. Hackett
     Executive Vice President & Chief           President and Chief 
     Financial Officer                          Executive Officer


Attest:                                    BANKBOSTON, N.A.



By:    /s/ Margaret Dunn                   By:    /s/ Joshua P. McGinn
   ------------------------------------       ----------------------------------
Name:  Margaret Dunn                       Name:  Joshua P. McGinn
Title: Senior Account Manager              Title: Senior Account Manager







                                       2

<PAGE>   1
                                                                    EXHIBIT 99.1

[SEAGULL ENERGY CORPORATION LOGO]
                                        [OCEAN ENERGY LOGO]
SEAGULL ENERGY CORPORATION




FOR IMMEDIATE RELEASE
November 25, 1998

CONTACTS:   Seagull Energy Corporation        Ocean Energy, Inc.
            Alan Payne (713) 951-4842         Michael O. Aldridge (713) 420-1142


           OCEAN ENERGY, INC. AND SEAGULL ENERGY CORPORATION TO MERGE
                    CREATING $3.6 BILLION OIL AND GAS COMPANY

            NEW COMPANY TO HAVE ENHANCED ACCESS TO CAPITAL TO EXPLOIT
                        SIGNIFICANT GROWTH OPPORTUNITIES

o    Tenth largest independent exploration and production company in the U.S.
     with a current equity market capitalization of $1.8 billion, enterprise
     value of $3.6 billion, and total proved reserves of approximately 500
     million barrels of oil

o    Shareholder-aligned management team with significant equity stake in the
     new company

o    Significant cost savings opportunities through overlapping operations and
     corporate overhead consolidation - savings in excess of $45 million
     annually

o    Large, high quality portfolio of assets with a balanced mix of oil vs. gas,
     domestic vs. international and exploration vs. exploitation

o    Cash flow accretive to both shareholder groups, after taking into account
     cost savings

o    Reduced capital expenditures of $500 to $600 million with planned
     dispositions of at least $100 million

HOUSTON - Ocean Energy, Inc. (NYSE: OEI) and Seagull Energy Corporation 
(NYSE: SGO) today announced that they have signed a definitive agreement to 
merge in a tax-free, stock-for-stock transaction creating the tenth largest 

<PAGE>   2

independent U.S. oil and gas company based on a pro forma total market equity
capitalization of approximately $1.8 billion based on yesterday's closing price
for Seagull's shares. The combined company will be named Ocean Energy, Inc., and
will be headquartered in Houston. The combined company will have a large, high
quality portfolio of assets with a balanced mix of oil vs. gas, domestic vs.
international, and exploration vs. exploitation opportunities. The merger
creates a company with critical mass, enhanced access to capital and a strong,
proven management team to exploit significant exploration and development
opportunities. The combined company's management team expects production and
cash flow growth from the combination and anticipates generating cost savings in
excess of $45 million annually.

The Board of Directors of each company approved the transaction and recommends
the merger. In the merger, Ocean Energy will merge with and into Seagull, which
will be renamed Ocean Energy, Inc. Each old Ocean Energy shareholder will
receive one newly issued share of Seagull common stock for each Ocean Energy
common share, and all Seagull shares will remain outstanding. As a result, new
Ocean Energy will have approximately 165 million shares outstanding, of which
approximately 61.5% will be owned by Ocean Energy shareholders and 38.5% will be
owned by Seagull shareholders. The merger will be accounted for as a purchase
transaction and is expected to close by the end of March 1999.

Core operating areas will be organized into three business units: Onshore North
America, Gulf of Mexico and International - creating great potential for cost
savings through consolidation of operations and overhead, asset rationalizations
and sales of non-core assets. Specifically, the combined company intends to cut
costs in excess of $45 million by eliminating duplicate corporate headquarters
and staff. New Ocean Energy will also high-grade the combined exploration
programs and rationalize the combined portfolio of development and exploitation
projects. New Ocean Energy also intends to manage its debt and raise additional
growth capital through the disposition of non-core domestic and international
assets including at least $100 million of asset sales in 1999.


<PAGE>   3

James C. Flores, Ocean Energy's current President and C.E.O., will become
Chairman of the Board of the combined company. James T. Hackett, Seagull's
current President and C.E.O., will be President and Chief Executive Officer of
the combined company. Barry J. Galt and John B. Brock, the respective Chairmen
of Seagull and Ocean Energy, will serve on the Board of Directors of the
combined company. Management will own approximately 10.5% of the common stock of
the combined company, including approximately 6.6% to be beneficially owned by
James C. Flores. "The combination between Ocean Energy and Seagull will add
tremendous value to the combined shareholder base through financial strength,
cost efficiencies, expanded opportunity inventory -- both exploration and
exploitation," said Mr. Flores. "In addition, the combination accelerates
Ocean's strategy of becoming more weighted toward natural gas in terms of
reserves and production, as well as combines a dynamic management team that is
completely aligned with shareholders."

"Ocean Energy's demonstrated ability to develop significant exploration and
exploitation inventory, our ability to manage discretionary cash flow and the
opportunities we see for significant cost savings make this a very compelling
transaction," said Mr. Hackett. "With the combined company's size, scale and
scope, we will be better positioned, than either Ocean Energy or Seagull was on
a stand-alone basis, to weather and leverage commodity cycles and to be
opportunistic regardless of the commodity environment."

On a pro forma basis, current daily production for the combined company would be
approximately 80 thousand barrels of oil and 622 million cubic feet of gas, for
a total of 184 thousand barrels of oil equivalent. It is estimated that the
combined company will have proved reserves of approximately 500 million barrels
of oil equivalent, with approximately 57% natural gas and 43% oil. Approximately
68% of proved reserves are located in North America with the remaining 32%
located internationally. The combined company will also have in excess of 22
million net undeveloped acres in 14 countries.


<PAGE>   4

Additionally, the new Ocean Energy management team intends to manage the
combined company's capital expenditure budget in order to improve the balance
sheet. The capital expenditure budget for the combined company is expected to be
approximately $500 to $600 million in 1999, fully funded by expected combined
operating cash flows and from the disposition of at least $100 million of
non-core domestic and international assets.

The Board of Directors will be comprised of eight individuals from the Ocean
Energy board and seven from the Seagull board, for a total of 15 board members.
Officers reporting to Mr. Hackett will include: James L. Dunlap, Vice Chairman;
William L. Transier, Executive Vice President and Chief Financial Officer;
Robert K. Reeves, Executive Vice President and General Counsel; Richard F.
Barnes, President, ENSTAR Natural Gas, as well as other operating heads. Mr.
Flores, Ocean's current chairman John B. Brock, Mr. Hackett, Seagull's current
Chairman Barry J. Galt, and The Prudential Insurance Company of America have
committed to vote in favor of the merger. As a result, the holders of
approximately 10% of each company's common shares have already agreed to support
the merger.

The transaction is subject to shareholder approvals, expiration of the
Hart-Scott-Rodino waiting period, certain regulatory approvals, and other
customary closing conditions.

Lehman Brothers and J.P. Morgan acted as financial advisors to Ocean Energy, and
Merrill Lynch & Co. and Warburg Dillon Read acted as financial advisors to
Seagull.

Certain statements in this news release regarding future expectations, potential
results of the business combination, plans for acquisitions, capital
expenditures, dispositions, and oil and gas exploration, development, production
and pricing may be regarded as "forward looking statements" within the meaning
of the Securities Litigation Reform Act. They are subject to various risks, such
as operating hazards, drilling risks, and the inherent uncertainties in
interpreting engineering data 


<PAGE>   5

relating to underground accumulations of oil and gas, as well as other risks
discussed in detail in the companies' SEC filings, including the Annual Reports
on Form 10-K for the year ended December 31, 1997. Actual results may vary
materially.

                                      ###


<PAGE>   1
                                                                    EXHIBIT 99.2

                                                                          Brock

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Seagull Energy Corporation, a Texas corporation ("Seagull"), and John B. Brock
(the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS, as of the date hereof, the Stockholder owns an aggregate of
149,120 shares (together with any shares acquired after the date hereof, the
"Shares") of Common Stock, par value $.01 per share ("OEI Common Stock"), of
Ocean Energy, Inc., a Delaware corporation ("OEI");

         WHEREAS, Seagull is prepared to enter into an Agreement and Plan of
Merger with OEI (as amended from time to time, the "Merger Agreement") providing
for the merger of OEI with and into Seagull (the "Merger"), with Airplane being
the surviving entity;

         WHEREAS, in order to encourage Seagull to enter into the Merger
Agreement with OEI, the Stockholder is willing to enter into certain
arrangements with respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. From the date hereof until the
earliest to occur of (i) the termination of the Merger Agreement, and (ii) the
consummation of the Merger:

                  (a) The Stockholder owns the Shares and will not, directly or
         indirectly, (i) sell, transfer, pledge or otherwise dispose of any
         Shares to any person other than Seagull or its designee unless such
         person shall have agreed in writing to be bound by the terms of this
         Agreement, or (ii) grant a proxy with respect to any Shares to any
         person other than Seagull or its designee, or grant an option with
         respect to any of the foregoing, or enter into any other agreement or
         arrangement with respect to any of the foregoing.

                  (b) The Stockholder will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any merger,
         consolidation, share exchange, business combination or similar
         transaction involving OEI or any of its subsidiaries or the acquisition
         in any manner, directly or indirectly, of a material equity interest in
         any voting securities of, or a substantial portion of the assets of,
         OEI or any of its Subsidiaries, other than the transactions
         contemplated by this Agreement or the Merger Agreement (a "Competing
         Transaction"), or enter into discussions or negotiate with any person
         or entity in furtherance of such inquiries or to obtain a Competing


<PAGE>   2



         Transaction, or agree to, or endorse, any Competing Transaction, or
         authorize or permit any investment banker, financial advisor, attorney,
         accountant or other representative retained by the Stockholder to take
         any such action. The Stockholder shall promptly notify Seagull of all
         relevant terms of any such inquiries or proposals received by the
         Stockholder or by any such investment banker, financial advisor,
         attorney, accountant or other representative relating to any of such
         matters and if such inquiry or proposal is in writing, the Stockholder
         shall deliver or cause to be delivered to Seagull a copy of such
         inquiry or proposal.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by Seagull, the
         Stockholder will not attend and the Stockholder will not vote the
         Shares at any annual or special meeting of stockholders at which a
         Competing Transaction is being considered, or execute any written
         consent of stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares or any other voting securities of OEI held by the
         Stockholder.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict the Stockholder from acting in accordance with his
fiduciary duties as an officer or director of OEI.

         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and Seagull, on the
         other, acknowledge and agree that irreparable damage would occur if any
         of the provisions of this Agreement were not performed in accordance
         with their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and provisions hereof in any court of
         the United States or any state thereof having jurisdiction, in addition
         to any other stockholder to which they may be entitled at law or
         equity.

                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.


                                        2

<PAGE>   3



                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to Seagull:

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                           With copies to:

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343

                  If to the Stockholder:

                           John B. Brock
                           c/o Ocean Energy Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Facsimile No.:  (713) 420-1108

         or to such other address or telecopy number as any party may, from time
         to time, designate in a written notice given in a like manner. Notice
         given by telecopy shall be deemed

                                        3

<PAGE>   4



         delivered on the day the sender receives telecopy confirmation that
         such notice was received at the telecopy number of the addressee.
         Notice given by mail as set out above shall be deemed delivered three
         days after the date the same is postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the second whereas clause of this Agreement, or
                  any amendment to or modification that does not adversely
                  affect the economic value of the Merger to the Stockholder
                  pursuant to the transaction set forth in the Merger Agreement.

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.

                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to Seagull as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of any agreement, proxy, document, instrument,
         judgment, decree, order, governmental permit, certificate, license,
         law, statute, rule or regulation to which the Stockholder is a party or
         to which it is subject, (b) result in the creation of any lien, charge
         or other encumbrance on any Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency or other instrumentality or any other person or entity is
         required to authorize, or is otherwise required in connection with, the
         execution and delivery of this Agreement or the Stockholder's
         performance of the terms of this Agreement or the validity or
         enforceability of this Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.


                                        4

<PAGE>   5



                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.




                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and Seagull have each caused this
Agreement to be duly executed as of the day and year first above written.

                                  SEAGULL ENERGY CORPORATION


                                  By:  /s/ JAMES T. HACKETT
                                     ------------------------------------------
                                    Name:  James T. Hackett
                                    Title: President and Chief Executive Officer


                                  JOHN B. BROCK

                                      /s/ JOHN B. BROCK
                                  ---------------------------------------------





                                        6


<PAGE>   1
                                                                    EXHIBIT 99.3

                                                                         Flores

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Seagull Energy Corporation, a Texas corporation ("Seagull"), and James C. Flores
(the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS, as of the date hereof, the Stockholder beneficially (i) owns
an aggregate of 3,876,235 shares of Common Stock, par value $.01 per share ("OEI
Common Stock"), of Ocean Energy, Inc., a Delaware corporation ( "OEI"), and (ii)
has the right to vote or direct the vote of 3,744,000 shares of OEI Common Stock
pursuant to that certain Irrevocable Proxy, dated September 25, 1996, executed
by William W. Rucks, IV, Catherine May Rucks and the Rucks Family Partnership in
favor of the Stockholder (such shares of OEI Common Stock referred to in clauses
(i) and (ii) above and any shares of OEI Common Stock acquired by the
Stockholder after the date hereof, the "Shares");

         WHEREAS, Seagull is prepared to enter into an Agreement and Plan of
Merger with OEI (as amended from time to time, the "Merger Agreement") providing
for the merger of OEI with and into Seagull (the "Merger"), with Airplane being
the surviving entity;

         WHEREAS, in order to encourage Seagull to enter into the Merger
Agreement with OEI, the Stockholder is willing to enter into certain
arrangements with respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. From the date hereof until the
earliest to occur of (i) the termination of the Merger Agreement, and (ii) the
consummation of the Merger:

                  (a) The Stockholder beneficially owns the Shares and will not,
         directly or indirectly, (i) sell, transfer, pledge or otherwise dispose
         of any Shares to any person other than Seagull or its designee unless
         such person shall have agreed in writing to be bound by the terms of
         this Agreement, or (ii) grant a proxy with respect to any Shares to any
         person other than Seagull or its designee, or grant an option with
         respect to any of the foregoing, or enter into any other agreement or
         arrangement with respect to any of the foregoing.

                  (b) The Stockholder will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any merger,
         consolidation, share exchange, business combination or similar
         transaction involving


<PAGE>   2



         OEI or any of its subsidiaries or the acquisition in any manner,
         directly or indirectly, of a material equity interest in any voting
         securities of, or a substantial portion of the assets of, OEI or any of
         its Subsidiaries, other than the transactions contemplated by this
         Agreement or the Merger Agreement (a "Competing Transaction"), or enter
         into discussions or negotiate with any person or entity in furtherance
         of such inquiries or to obtain a Competing Transaction, or agree to, or
         endorse, any Competing Transaction, or authorize or permit any
         investment banker, financial advisor, attorney, accountant or other
         representative retained by the Stockholder to take any such action. The
         Stockholder shall promptly notify Seagull of all relevant terms of any
         such inquiries or proposals received by the Stockholder or by any such
         investment banker, financial advisor, attorney, accountant or other
         representative relating to any of such matters and if such inquiry or
         proposal is in writing, the Stockholder shall deliver or cause to be
         delivered to Seagull a copy of such inquiry or proposal.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by Seagull, the
         Stockholder will not attend and the Stockholder will not vote the
         Shares at any annual or special meeting of stockholders at which a
         Competing Transaction is being considered, or execute any written
         consent of stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares or any other voting securities of OEI held by the
         Stockholder.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict the Stockholder from acting in accordance with his
fiduciary duties as an officer or director of OEI.

         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and Seagull, on the
         other, acknowledge and agree that irreparable damage would occur if any
         of the provisions of this Agreement were not performed in accordance
         with their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and

                                        2

<PAGE>   3



         provisions hereof in any court of the United States or any state
         thereof having jurisdiction, in addition to any other stockholder to
         which they may be entitled at law or equity.

                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.

                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to Seagull:

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                           With copies to:

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343


                                        3

<PAGE>   4



                  If to the Stockholder:

                           James C. Flores
                           c/o Ocean Energy Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Facsimile No.:  (713) 420-1982

         or to such other address or telecopy number as any party may, from time
         to time, designate in a written notice given in a like manner. Notice
         given by telecopy shall be deemed delivered on the day the sender
         receives telecopy confirmation that such notice was received at the
         telecopy number of the addressee. Notice given by mail as set out above
         shall be deemed delivered three days after the date the same is
         postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the second whereas clause of this Agreement, or
                  any amendment to or modification that does not adversely
                  affect the economic value of the Merger to the Stockholder
                  pursuant to the transaction set forth in the Merger Agreement.

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.

                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to Seagull as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of any agreement, proxy, document, instrument,
         judgment, decree, order, governmental permit, certificate, license,
         law, statute, rule or regulation to which the Stockholder is a party or
         to which it is subject, (b) result in the creation of any lien, charge
         or other encumbrance on any Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency

                                        4

<PAGE>   5



         or other instrumentality or any other person or entity is required to
         authorize, or is otherwise required in connection with, the execution
         and delivery of this Agreement or the Stockholder's performance of the
         terms of this Agreement or the validity or enforceability of this
         Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.

                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.




                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and Seagull have each caused this
Agreement to be duly executed as of the day and year first above written.

                             SEAGULL ENERGY CORPORATION


                             By: /s/ JAMES T. HACKETT
                                -------------------------------------------
                               Name:  James T. Hackett
                               Title: President and Chief Executive Officer


                             JAMES C. FLORES

                             /s/ JAMES C. FLORES
                             ----------------------------------------------




                                        6


<PAGE>   1
                                                                    EXHIBIT 99.4

                                              Flores Family Limited Partnership

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Seagull Energy Corporation, a Texas corporation ("Seagull"), and the Flores
Family Limited Partnership (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS, as of the date hereof, the Stockholder owns an aggregate of
3,305,016 shares (such shares any shares acquired after the date hereof, the
"Shares") of Common Stock, par value $.01 per share ("OEI Common Stock"), of
Ocean Energy, Inc., a Delaware corporation ( "OEI");

         WHEREAS, Seagull is prepared to enter into an Agreement and Plan of
Merger with OEI (as amended from time to time, the "Merger Agreement") providing
for the merger of OEI with and into Seagull (the "Merger"), with Airplane being
the surviving entity;

         WHEREAS, in order to encourage Seagull to enter into the Merger
Agreement with OEI, the Stockholder is willing to enter into certain
arrangements with respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. From the date hereof until the
earliest to occur of (i) the termination of the Merger Agreement, and (ii) the
consummation of the Merger:

                  (a) The Stockholder owns the Shares and will not, directly or
         indirectly, (i) sell, transfer, pledge or otherwise dispose of any
         Shares to any person other than Seagull or its designee unless such
         person shall have agreed in writing to be bound by the terms of this
         Agreement, or (ii) grant a proxy with respect to any Shares to any
         person other than Seagull or its designee, or grant an option with
         respect to any of the foregoing, or enter into any other agreement or
         arrangement with respect to any of the foregoing.

                  (b) The Stockholder will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any merger,
         consolidation, share exchange, business combination or similar
         transaction involving OEI or any of its subsidiaries or the acquisition
         in any manner, directly or indirectly, of a material equity interest in
         any voting securities of, or a substantial portion of the assets of,
         OEI or any of its Subsidiaries, other than the transactions
         contemplated by this Agreement or the Merger Agreement (a "Competing
         Transaction"), or enter into discussions or negotiate



<PAGE>   2


          with any person or entity in furtherance of such inquiries or to
          obtain a Competing Transaction, or agree to, or endorse, any Competing
          Transaction, or authorize or permit any investment banker, financial
          advisor, attorney, accountant or other representative retained by the
          Stockholder to take any such action. The Stockholder shall promptly
          notify Seagull of all relevant terms of any such inquiries or
          proposals received by the Stockholder or by any such investment
          banker, financial advisor, attorney, accountant or other
          representative relating to any of such matters and if such inquiry or
          proposal is in writing, the Stockholder shall deliver or cause to be
          delivered to Seagull a copy of such inquiry or proposal.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by Seagull, the
         Stockholder will not attend and the Stockholder will not vote the
         Shares at any annual or special meeting of stockholders at which a
         Competing Transaction is being considered, or execute any written
         consent of stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares or any other voting securities of OEI held by the
         Stockholder.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict the Stockholder from acting in accordance with his
fiduciary duties as an officer or director of OEI.

         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and Seagull, on the
         other, acknowledge and agree that irreparable damage would occur if any
         of the provisions of this Agreement were not performed in accordance
         with their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and provisions hereof in any court of
         the United States or any state thereof having jurisdiction, in addition
         to any other stockholder to which they may be entitled at law or
         equity.

                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.


                                        2

<PAGE>   3



                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to Seagull:

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                           With copies to:

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343

                  If to the Stockholder:

                           c/o James C. Flores
                           c/o Ocean Energy Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Facsimile No.:  (713) 420-1982

          or to such other address or telecopy number as any party may, from
          time to time, designate in a written notice given in a like manner.
          Notice given by telecopy shall be deemed

                                        3

<PAGE>   4



         delivered on the day the sender receives telecopy confirmation that
         such notice was received at the telecopy number of the addressee.
         Notice given by mail as set out above shall be deemed delivered three
         days after the date the same is postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the second whereas clause of this Agreement, or
                  any amendment to or modification that does not adversely
                  affect the economic value of the Merger to the Stockholder
                  pursuant to the transaction set forth in the Merger Agreement.

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.

                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to Seagull as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of any agreement, proxy, document, instrument,
         judgment, decree, order, governmental permit, certificate, license,
         law, statute, rule or regulation to which the Stockholder is a party or
         to which it is subject, (b) result in the creation of any lien, charge
         or other encumbrance on any Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency or other instrumentality or any other person or entity is
         required to authorize, or is otherwise required in connection with, the
         execution and delivery of this Agreement or the Stockholder's
         performance of the terms of this Agreement or the validity or
         enforceability of this Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.


                                        4

<PAGE>   5



                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.




                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and Seagull have each caused this
Agreement to be duly executed as of the day and year first above written.

                                 SEAGULL ENERGY CORPORATION


                                 By:  /s/ JAMES T. HACKETT
                                    -------------------------------------------
                                   Name:  James T. Hackett
                                   Title: President and Chief Executive Officer


                                 FLORES FAMILY LIMITED PARTNERSHIP


                                 By:  /s/ JAMES C. FLORES
                                    -------------------------------------------
                                 Name:
                                 Title:





                                        6


<PAGE>   1
                                                                    EXHIBIT 99.5

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Ocean Energy, Inc., a Delaware corporation ("OEI"), and The Prudential Insurance
Company of America (the "Stockholder").

                              W I T N E S S E T H:

         WHEREAS, the Stockholder owns an aggregate of 5,554,161 shares (the
"Shares") of Common Stock, par value $.10 per share ("Seagull Common Stock"), of
Seagull Corporation, a Texas corporation (the "Seagull").

         WHEREAS, the Shares are managed by Prudential Capital Group, an
investment unit of the Stockholder (together with representatives, employees and
agents of the Stockholder assigned thereto, the "Manager").

         WHEREAS, OEI is prepared to enter into an Agreement and Plan of Merger
to be dated as of the date hereof with Seagull (as amended from time to time,
the "Merger Agreement") providing for the merger of OEI with and into Seagull
(the "Merger");

         WHEREAS, in order to encourage OEI to enter into the Merger Agreement
with Seagull, the Stockholder is willing to enter into certain arrangements with
respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. Except for any agreement that
shall expire at an earlier date as expressly set forth below, from the date
hereof until the earliest to occur of (i) the termination of the Merger
Agreement, (ii) August 30, 1999 and (iii) the consummation of the Merger:

                  (a) The Stockholder owns the Shares and, on or before April
         14, 1998, will not, directly or indirectly, (i) sell, transfer, pledge
         or otherwise dispose of any Shares to any person other than OEI or its
         designee unless such person shall have agreed in writing to be bound by
         the terms of this Agreement, or (ii) grant a proxy with respect to any
         Shares to any person other than OEI or its designee, or grant an option
         with respect to any of the foregoing, or enter into any other agreement
         or arrangement with respect to any of the foregoing.

                  (b) The Manager will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any 


<PAGE>   2


         merger, consolidation, share exchange, business combination or similar
         transaction involving Seagull or any of its subsidiaries or the
         acquisition in any manner, directly or indirectly, of a material equity
         interest in any voting securities of, or a substantial portion of the
         assets of, Seagull or any of its Subsidiaries, other than the
         transactions contemplated by this Agreement or the Merger Agreement (a
         "Competing Transaction"), or enter into discussions or negotiate with
         any person or entity in furtherance of such inquiries or to obtain a
         Competing Transaction, or agree to, or endorse, any Competing
         Transaction, or authorize or permit any of its officers, directors or
         employees of the Stockholder assigned to the Manager or any investment
         banker, financial advisor, attorney, accountant or other representative
         retained by the Stockholder pursuant to any request by or suggestion of
         the Manager to take any such action. The Manager shall promptly notify
         OEI of all relevant terms of any such inquiries or proposals received
         by the Manager or by any such officer, director, employee, investment
         banker, financial advisor, attorney, accountant or other representative
         relating to any of such matters and if such inquiry or proposal is in
         writing, the Manager shall deliver or cause to be delivered to OEI a
         copy of such inquiry or proposal. For purposes of clarification, the
         foregoing shall not be deemed to restrict (i) the ability of the
         Stockholder and its Affiliates to engage in their investment operations
         (including trading and arbitrage), including those conducted by or
         through the Manager or (ii) Prudential Securities, Inc. or any
         division, unit, or direct or indirect subsidiary thereof in any manner.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and the
         election of directors contemplated by the Merger Agreement and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by OEI, the
         Manager will not attend and the Stockholder will not vote the Shares at
         any annual or special meeting of stockholders at which a Competing
         Transaction is being considered, or execute any written consent of
         stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger. OEI agrees to provide the Stockholder with a reasonable
         opportunity to review any such description of the terms of this
         Agreement in any such filings.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict any representative, employee or agent of the
Stockholder from acting in accordance with such person's fiduciary duties as an
officer or director of Seagull.


                                        2

<PAGE>   3



         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and OEI, on the other,
         acknowledge and agree that irreparable damage would occur if any of the
         provisions of this Agreement were not performed in accordance with
         their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and provisions hereof in any court of
         the United States or any state thereof having jurisdiction, in addition
         to any other stockholder to which they may be entitled at law or
         equity.

                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.

                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to OEI:

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           With copies to:

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                                        3

<PAGE>   4



                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605

                  If to the Stockholder:

                           The Prudential Insurance Company of America
                           c/o Prudential Capital Group
                           2200 Ross Avenue, Suite 4200E
                           Dallas, Texas 75201
                           Attention:  Managing Director
                           Facsimile No.:  (214) 720-6298

         or to such other address or telecopy number as any party may, from time
         to time, designate in a written notice given in a like manner. Notice
         given by telecopy shall be deemed delivered on the day the sender
         receives telecopy confirmation that such notice was received at the
         telecopy number of the addressee. Notice given by mail as set out above
         shall be deemed delivered three days after the date the same is
         postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the recitals of this Agreement, or any
                  amendment to or modification that does not adversely affect
                  the economic value of the Merger to the Stockholder pursuant
                  to the transaction set forth in the Merger Agreement,
                  including without limitation any increase in the Common Stock
                  Exchange Ratio (as defined in the Merger Agreement).

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.


                                        4

<PAGE>   5



                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to OEI as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of (i) any of the terms, provisions or conditions
         of the certificate of incorporation or bylaws of the Stockholder or
         (ii) any agreement, proxy, document, instrument, judgment, decree,
         order, governmental permit, certificate, license, law, statute, rule or
         regulation to which the Stockholder is a party or to which it is
         subject, (b) result in the creation of any lien, charge or other
         encumbrance on any of the Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency or other instrumentality or any other person or entity is
         required to authorize, or is otherwise required in connection with, the
         execution and delivery of this Agreement or the Stockholder's
         performance of the terms of this Agreement or the validity or
         enforceability of this Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.

                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.


                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and OEI have each caused this
Agreement to be duly executed by their respective officers, each of whom is duly
authorized, all as of the day and year first above written.

                             OCEAN ENERGY, INC.


                             By:   /s/ JAMES C. FLORES
                                -------------------------------------
                               Name:   James C. Flores
                               Title:  President and Chief Executive Officer


                             THE PRUDENTIAL INSURANCE
                               COMPANY OF AMERICA


                             By:   /s/ R. A. WALKER
                                -------------------------------------
                                       R. A. Walker
                                       Vice President








                                        6

<PAGE>   1
                                                                    EXHIBIT 99.6

                                                                        Hackett

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Ocean Energy, Inc., a Delaware corporation ("OEI"), and James T. Hackett (the
"Stockholder").

                              W I T N E S S E T H:

         WHEREAS, as of the date hereof the Stockholder owns an aggregate of
131,000 shares (together with any shares acquired after the date hereof, the
"Shares") of Common Stock, par value $.10 per share ("Seagull Common Stock"), of
Seagull Energy Corporation, a Texas corporation (the "Seagull").

         WHEREAS, OEI is prepared to enter into an Agreement and Plan of Merger
with Seagull (as amended from time to time, the "Merger Agreement") providing
for the merger of OEI with and into Seagull (the "Merger") with Seagull being
the surviving entity;

         WHEREAS, in order to encourage OEI to enter into the Merger Agreement
with Seagull, the Stockholder is willing to enter into certain arrangements with
respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. From the date hereof until the
earliest to occur of (i) the termination of the Merger Agreement, and (ii) the
consummation of the Merger:

                  (a) The Stockholder beneficially owns the Shares and will not,
         directly or indirectly, (i) sell, transfer, pledge or otherwise dispose
         of any Shares to any person other than OEI or its designee unless such
         person shall have agreed in writing to be bound by the terms of this
         Agreement, or (ii) grant a proxy with respect to any Shares to any
         person other than OEI or its designee, or grant an option with respect
         to any of the foregoing, or enter into any other agreement or
         arrangement with respect to any of the foregoing.

                  (b) The Stockholder will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any merger,
         consolidation, share exchange, business combination or similar
         transaction involving Seagull or any of its subsidiaries or the
         acquisition in any manner, directly or indirectly, of a material equity
         interest in any voting securities of, or a substantial portion of the
         assets of, Seagull or any of its Subsidiaries, other than the
         transactions contemplated by this Agreement or the Merger Agreement (a
         "Competing Transaction"), or enter into discussions


<PAGE>   2



         or negotiate with any person or entity in furtherance of such inquiries
         or to obtain a Competing Transaction, or agree to, or endorse, any
         Competing Transaction, or authorize or permit any investment banker,
         financial advisor, attorney, accountant or other representative
         retained by the Stockholder to take any such action. The Stockholder
         shall promptly notify OEI of all relevant terms of any such inquiries
         or proposals received by the Stockholder or by any such investment
         banker, financial advisor, attorney, accountant or other representative
         relating to any of such matters and if such inquiry or proposal is in
         writing, the Stockholder shall deliver or cause to be delivered to OEI
         a copy of such inquiry or proposal.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and the
         election of directors contemplated by the Merger Agreement and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by OEI, the
         Stockholder will not attend and the Stockholder will not vote the
         Shares at any annual or special meeting of stockholders at which a
         Competing Transaction is being considered, or execute any written
         consent of stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares or any other voting securities of Seagull held by
         the Stockholder.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict the Stockholder from acting in accordance with his
fiduciary duties as an officer or director of Seagull.

         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and OEI, on the other,
         acknowledge and agree that irreparable damage would occur if any of the
         provisions of this Agreement were not performed in accordance with
         their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and provisions hereof in any court of
         the United States or any state thereof having jurisdiction, in addition
         to any other stockholder to which they may be entitled at law or
         equity.


                                        2

<PAGE>   3



                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.

                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to OEI:

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           With copies to:

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605


                                        3

<PAGE>   4



                  If to the Stockholder:

                           James T. Hackett
                           c/o Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas 77002
                           Facsimile No.:  713-951-4790

         or to such other address or telecopy number as any party may, from time
         to time, designate in a written notice given in a like manner. Notice
         given by telecopy shall be deemed delivered on the day the sender
         receives telecopy confirmation that such notice was received at the
         telecopy number of the addressee. Notice given by mail as set out above
         shall be deemed delivered three days after the date the same is
         postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the second whereas clause of this Agreement, or
                  any amendment to or modification that does not adversely
                  affect the economic value of the Merger to the Stockholder
                  pursuant to the transaction set forth in the Merger Agreement.

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.

                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to OEI as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of any agreement, proxy, document, instrument,
         judgment, decree, order, governmental permit, certificate, license,
         law, statute, rule or regulation to which the Stockholder is a party or
         to which it is subject, (b) result in the creation of any lien, charge
         or other encumbrance on any Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency

                                        4

<PAGE>   5



         or other instrumentality or any other person or entity is required to
         authorize, or is otherwise required in connection with, the execution
         and delivery of this Agreement or the Stockholder's performance of the
         terms of this Agreement or the validity or enforceability of this
         Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.

                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.

                  (l) Effectiveness. This Agreement shall not become effective
         until Seagull has amended the Seagull Rights Plan (as defined in the
         Merger Agreement) to provide that OEI will not become an "Acquiring
         Person" thereunder as a result of its entering into this Agreement and
         the other Voting Agreements to be entered into by OEI in connection
         with the Merger.


                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and OEI have each caused this
Agreement to be duly executed as of the day and year first above written.

                                 OCEAN ENERGY, INC.


                                 By: /s/ JAMES C. FLORES
                                    ---------------------------------------
                                      James C. Flores
                                      President and Chief Executive Officer


                                 JAMES T. HACKETT

                                 /s/ JAMES T. HACKETT
                                 ------------------------------------------











                                        6


<PAGE>   1

                                                                    EXHIBIT 99.7

                                                                           Galt

                                VOTING AGREEMENT

         VOTING AGREEMENT ("Agreement") dated as of November 24, 1998 between
Ocean Energy, Inc., a Delaware corporation ("OEI"), and Barry J. Galt (the
"Stockholder").

                              W I T N E S S E T H:

         WHEREAS, as of the date hereof the Stockholder owns an aggregate of
323,000 shares (together with any shares acquired after the date hereof, the
"Shares") of Common Stock, par value $.10 per share ("Seagull Common Stock"), of
Seagull Energy Corporation, a Texas corporation (the "Seagull").

         WHEREAS, OEI is prepared to enter into an Agreement and Plan of Merger
with Seagull (as amended from time to time, the "Merger Agreement") providing
for the merger of OEI with and into Seagull (the "Merger") with Seagull being
the surviving entity;

         WHEREAS, in order to encourage OEI to enter into the Merger Agreement
with Seagull, the Stockholder is willing to enter into certain arrangements with
respect to the Shares;

         NOW, THEREFORE, in consideration of the premises set forth above, the
mutual promises set forth below, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Stockholder's Support of the Merger. From the date hereof until the
earliest to occur of (i) the termination of the Merger Agreement, and (ii) the
consummation of the Merger:

                  (a) The Stockholder beneficially owns the Shares and will not,
         directly or indirectly, (i) sell, transfer, pledge or otherwise dispose
         of any Shares to any person other than OEI or its designee unless such
         person shall have agreed in writing to be bound by the terms of this
         Agreement, or (ii) grant a proxy with respect to any Shares to any
         person other than OEI or its designee, or grant an option with respect
         to any of the foregoing, or enter into any other agreement or
         arrangement with respect to any of the foregoing.

                  (b) The Stockholder will not initiate, solicit or encourage
         (including by way of furnishing information or assistance), or take any
         other action to facilitate, any inquiries or the making of any proposal
         relating to, or that may reasonably be expected to lead to, any merger,
         consolidation, share exchange, business combination or similar
         transaction involving Seagull or any of its subsidiaries or the
         acquisition in any manner, directly or indirectly, of a material equity
         interest in any voting securities of, or a substantial portion of the
         assets of, Seagull or any of its Subsidiaries, other than the
         transactions contemplated by this Agreement or the Merger Agreement (a
         "Competing Transaction"), or enter into discussions


<PAGE>   2



         or negotiate with any person or entity in furtherance of such inquiries
         or to obtain a Competing Transaction, or agree to, or endorse, any
         Competing Transaction, or authorize or permit any investment banker,
         financial advisor, attorney, accountant or other representative
         retained by the Stockholder to take any such action. The Stockholder
         shall promptly notify OEI of all relevant terms of any such inquiries
         or proposals received by the Stockholder or by any such investment
         banker, financial advisor, attorney, accountant or other representative
         relating to any of such matters and if such inquiry or proposal is in
         writing, the Stockholder shall deliver or cause to be delivered to OEI
         a copy of such inquiry or proposal.

                  (c) The Stockholder agrees that it will vote all Shares (i) in
         favor of approval of the Merger Agreement and the Merger and the
         election of directors contemplated by the Merger Agreement and (ii)
         subject to the provisions of paragraph (d) below, against any
         combination proposal or other matter that may interfere or be
         inconsistent with the Merger (including without limitation a Competing
         Transaction).

                  (d) The Stockholder agrees that, if requested by OEI, the
         Stockholder will not attend and the Stockholder will not vote the
         Shares at any annual or special meeting of stockholders at which a
         Competing Transaction is being considered, or execute any written
         consent of stockholders relating directly or indirectly to a Competing
         Transaction, during such period.

                  (e) The Stockholder acknowledges that the terms of this
         Agreement will be required to be described, and this Agreement will be
         required to be filed, in certain securities law filings relating to the
         Merger.

                  (f) To the extent inconsistent with the provisions of this
         Section 1, the Stockholder hereby revokes any and all proxies with
         respect to the Shares or any other voting securities of Seagull held by
         the Stockholder.

         Notwithstanding anything to the contrary set forth herein, this
Agreement shall not restrict the Stockholder from acting in accordance with his
fiduciary duties as an officer or director of Seagull.

         2.       Miscellaneous

                  (a) The Stockholder, on the one hand, and OEI, on the other,
         acknowledge and agree that irreparable damage would occur if any of the
         provisions of this Agreement were not performed in accordance with
         their specific terms or were otherwise breached. It is accordingly
         agreed that the parties shall be entitled to an injunction or
         injunctions to prevent breaches of the provisions of this Agreement and
         to enforce specifically the terms and provisions hereof in any court of
         the United States or any state thereof having jurisdiction, in addition
         to any other stockholder to which they may be entitled at law or
         equity.


                                        2

<PAGE>   3



                  (b) Descriptive headings are for convenience only and shall
         not control or affect the meaning or construction of any provision of
         this Agreement.

                  (c) All notices, consents, requests, instructions, approvals
         and other communications provided for herein shall be validly given,
         made or served, if in writing and delivered personally, by telecopy or
         sent by registered mail, postage prepaid:

                  If to OEI:

                           Ocean Energy, Inc.
                           1201 Louisiana, Suite 1400
                           Houston, Texas  77002
                           Attention: Robert K. Reeves
                           Facsimile No.:  (713) 420-1182

                           With copies to:

                           Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                           1700 Pacific Avenue, Suite 4100
                           Dallas, Texas 75201-4675
                           Attention: Michael E. Dillard, P.C.
                           Facsimile No.:  (214) 969-4343

                           Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas  77002
                           Attention: General Counsel
                           Facsimile No.:  (713) 210-2194

                           Vinson & Elkins L.L.P.
                           2300 First City Tower
                           1001 Fannin
                           Houston, Texas  77002-6760
                           Attention:  J. Mark Metts
                           Facsimile No.:  (713) 615-5605


                                        3

<PAGE>   4



                  If to the Stockholder:

                           Barry J. Galt
                           c/o Seagull Energy Corporation
                           1001 Fannin, Suite 1700
                           Houston, Texas 77002
                           Facsimile No.:  713-951-4733

         or to such other address or telecopy number as any party may, from time
         to time, designate in a written notice given in a like manner. Notice
         given by telecopy shall be deemed delivered on the day the sender
         receives telecopy confirmation that such notice was received at the
         telecopy number of the addressee. Notice given by mail as set out above
         shall be deemed delivered three days after the date the same is
         postmarked.

                  (d) From and after the termination of this Agreement, the
         covenants of the parties set forth herein shall be of no further force
         or effect and the parties shall be under no further obligation with
         respect thereto.

                  (e) Definitions. For purposes of this Agreement, the following
         terms shall have the following meanings:

                           (i) Affiliate. "Affiliate" shall have the meaning
                  ascribed to it in Rule 12b-2 of the General Rules and
                  Regulations under the Exchange Act, as in effect on the date
                  hereof.

                           (ii) Merger. "Merger" shall mean the transaction
                  referred to in the second whereas clause of this Agreement, or
                  any amendment to or modification that does not adversely
                  affect the economic value of the Merger to the Stockholder
                  pursuant to the transaction set forth in the Merger Agreement.

                           (iii) Person. A "person" shall mean any individual,
                  firm, corporation, partnership, trust, limited liability
                  company or other entity.

                  (f) Due Authorization; No Conflicts. The Stockholder hereby
         represents and warrants to OEI as follows: the Stockholder has full
         power and authority to enter into this Agreement. Neither the execution
         or delivery of this Agreement nor the consummation of the transactions
         contemplated herein will (a) conflict with or result in a breach,
         default or violation of any agreement, proxy, document, instrument,
         judgment, decree, order, governmental permit, certificate, license,
         law, statute, rule or regulation to which the Stockholder is a party or
         to which it is subject, (b) result in the creation of any lien, charge
         or other encumbrance on any Shares or (c) require the Stockholder to
         obtain the consent of any private nongovernmental third party. No
         consent, action, approval or authorization of, or registration,
         declaration or filing with, any governmental department, commission,
         agency

                                        4

<PAGE>   5



         or other instrumentality or any other person or entity is required to
         authorize, or is otherwise required in connection with, the execution
         and delivery of this Agreement or the Stockholder's performance of the
         terms of this Agreement or the validity or enforceability of this
         Agreement.

                  (g) Successors and Assigns. This Agreement shall be binding
         upon, and inure to the benefit of, the parties hereto and their
         respective heirs, personal representatives, successors and assigns,
         but, except as contemplated pursuant to paragraph 1(a), shall not be
         assignable by any party hereto without the prior written consent of the
         other parties hereto.

                  (h) Waiver. No party may waive any of the terms or conditions
         of this Agreement except by a duly signed writing referring to the
         specific provision to be waived.

                  (i) Governing Law. This Agreement shall be governed by, and
         construed and enforced in accordance with, the laws of the State of
         Texas.

                  (j) Entire Agreement. This Agreement constitutes the entire
         agreement, and supersedes all other and prior agreements and
         understandings, both written and oral, among the parties hereto and
         their Affiliates.

                  (k) Counterparts. This Agreement may be executed in two or
         more counterparts, each of which shall be deemed an original but all of
         which shall constitute one and the same instrument.

                  (l) Effectiveness. This Agreement shall not become effective
         until Seagull has amended the Seagull Rights Plan (as defined in the
         Merger Agreement) to provide that OEI will not become an "Acquiring
         Person" thereunder as a result of its entering into this Agreement and
         the other Voting Agreements to be entered into by OEI in connection
         with the Merger.


                                        5

<PAGE>   6


         IN WITNESS WHEREOF, the Stockholder and OEI have each caused this
Agreement to be duly executed as of the day and year first above written.

                                       OCEAN ENERGY, INC.


                                       By: /s/ JAMES C. FLORES
                                          -------------------------------------
                                          James C. Flores
                                          President and Chief Executive Officer


                                       BARRY J. GALT

                                       /s/ BARRY J. GALT
                                       ----------------------------------------








                                        6


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