ARCH PETROLEUM INC /NEW/
8-K, 1998-06-04
DRILLING OIL & GAS WELLS
Previous: SEAGULL ENERGY CORP, 8-K, 1998-06-04
Next: JACKPOT ENTERPRISES INC, SC 13D/A, 1998-06-04




================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K

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






         Date of Report (Date of Earliest Event Reported): May 28, 1998





                               ARCH PETROLEUM INC.

             (Exact Name of Registrant as Specified in its Charter)



                                    Delaware

                 (State or Other Jurisdiction of Incorporation)

          0-9976                                       83-0248900

 (Commission File Number)                 (I.R.S. Employer Identification No.)



       777 Taylor Street, Suite II-A
             Fort Worth, Texas                                  76102

  (Address of Principal Executive Offices)                    (Zip Code)



                                 (817) 332-9209

              (Registrant's Telephone Number, Including Area Code)





          (Former Name or Former Address, if Changed Since Last Report)
================================================================================


                                        1




<PAGE>







ITEM 5.     OTHER EVENTS

      On May 28, 1998,  Arch  Petroleum  Inc.  (the  "Company")  entered into an
Agreement  and Plan of Merger  (the  "Merger  Agreement")  with  Pogo  Producing
Company  ("Pogo") and Alphac,  Inc.  ("Merger  Sub").  At the Effective Time (as
defined in the Merger  Agreement),  Merger Sub will be merged  with and into the
Company,  the Company  will  become a wholly  owned  subsidiary  of Pogo and the
stockholders  of the  Company  will  receive  shares of common  stock of Pogo as
consideration for the merger. The merger was unanimously  approved by the Boards
of Directors  of Pogo and the Company.  The merger is subject to approval of the
stockholders of the Company and to customary regulatory approvals.

      The  Company  will  file a proxy  statement/prospectus  as part of  Pogo's
Registration  Statement on Form S-4 as soon as practicable.  The Company intends
to  distribute  the proxy  statement/prospectus  to the  Company's  stockholders
promptly  after  the  Registration   Statement  is  declared  effective  by  the
Securities and Exchange Commission.




                                     2



<PAGE>






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

(c)  Exhibits

     2.1  Agreement  and Plan of Merger,  dated as of May 28,  1998,  among Pogo
          Producing  Company  ("Pogo"),  Alphac,  Inc. and Arch  Petroleum  Inc.
          ("Arch").

     2.2  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and The Travelers Life and Annuity Company.

     2.3  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and The Travelers Indemnity Company.

     2.4  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and Connecticut General Life Insurance Company.

     2.5  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and CIGNA Mezzanine Partners III, L.P.

     2.6  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and The Lincoln National Life Insurance Company.

     2.7  Stockholder  Agreement,  dated as of May 28, 1998, by and between Pogo
          and Threshold Development Company.

     2.8  Form of  Stockholder  Agreement  between Pogo and each of the officers
          and directors of Arch.

     99.1 Press Release dated May 29, 1998.


                                     3



<PAGE>






                                  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.

                                    ARCH PETROLEUM INC.



Date:  June 4, 1998                 By:      /s/ Randall W. Scroggins
                                        Randall W. Scroggins
                                        Executive Vice President



                                     4



<PAGE>





                               INDEX TO EXHIBITS


Exhibit                                                                   Page
Number                             Description                           Number


 2.1   Agreement and Plan of Merger, dated as of May 28,1998, among
       Pogo Producing Company ("Pogo"), Alphac, Inc. and Arch
       Petroleum Inc. ("Arch")

 2.2   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and The Travelers Life and Annuity Company

 2.3   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and The Travelers Indemnity Company

 2.4   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and Connecticut General Life Insurance Company

 2.5   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and CIGNA Mezzanine Partners III, L.P.

 2.6   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and The Lincoln National Life Insurance Company

 2.7   Stockholder Agreement, dated as of May 28, 1998, by and
       between Pogo and Threshold Development Company

 2.8   Form of Stockholder Agreement between Pogo and each of
       the officers and directors of Arch

 99.1  Press Release dated May 29, 1998




                                     5


                                                                   EXHIBIT 2.1




                         AGREEMENT AND PLAN OF MERGER

                                     AMONG

                            POGO PRODUCING COMPANY

                                  ALPHAC CO.

                                      AND

                              ARCH PETROLEUM INC.



                           DATED AS OF MAY 28, 1998









<PAGE>



                               TABLE OF CONTENTS


                                  ARTICLE I
                                  THE MERGER

      1.1   The Merger; Effective Time of the Merger.........................2
      1.2   Closing..........................................................2
      1.3   Effects of the Merger............................................2

                                  ARTICLE II
            EFFECT OF THE MERGER ON THE CAPITAL STOCK AND CERTAIN
           INDEBTEDNESS OF THE CONSTITUENT CORPORATIONS;EXCHANGE OF
                                 CERTIFICATES

      2.1   Effect on Capital Stock..........................................2
      2.2   Exchange of Certificates.........................................3
      2.3   Effect on Certain Indebtedness...................................5

                                 ARTICLE III
                        REPRESENTATIONS AND WARRANTIES

      3.1   Representations and Warranties of Arch...........................6
      3.2   Representations and Warranties of Pogo and Sub..................21

                                  ARTICLE IV
              COVENANTS RELATING TO CONDUCT OF BUSINESS OF ARCH

      4.1   Conduct of Business by Arch Pending the Merger..................26
      4.2   No Solicitation.................................................28

                                  ARTICLE V
                            ADDITIONAL AGREEMENTS

      5.1   Preparation of S-4 and the Proxy Statement......................29
      5.2   Access to Information...........................................30
      5.3   Arch Stockholders Meeting.......................................30
      5.4   Filings; Other Action...........................................30
      5.5   Agreements of Others............................................31
      5.6   Authorization for Shares and Stock Exchange Listing.............31
      5.7   Employee Matters................................................31
      5.8   Stock Options...................................................32
      5.9   Arch Bank Credit Facilities.....................................33





                                     -i-

<PAGE>



      5.10  Modification of Indebtedness and Equity.........................33
      5.11  Agreement to Defend.............................................33
      5.12  Public Announcements............................................33
      5.13  Other Actions...................................................33
      5.14  Advice of Changes; SEC Filings..................................34
      5.15  Reorganization..................................................34
      5.16  Accounting Matters..............................................34
      5.17  Indemnification. ...............................................34
      5.18  Announcement of Combined Operations.............................35

                                  ARTICLE VI
                             CONDITIONS PRECEDENT

      6.1   Conditions to Each Party's Obligation to Effect the Merger......35
      6.2   Conditions of Obligations of Pogo and Sub.......................36
      6.3   Conditions of Obligations of Arch...............................37

                                 ARTICLE VII
                          TERMINATION AND AMENDMENT

      7.1   Termination.....................................................38
      7.2   Effect of Termination...........................................40
      7.3   Amendment.......................................................40
      7.4   Extension; Waiver...............................................40

                                 ARTICLE VIII
                              GENERAL PROVISIONS

      8.1   Payment of Expenses.............................................41
      8.2   Survival of Certain Representations, Warranties and Agreements..41
      8.3   Notices.........................................................41
      8.4   Interpretation..................................................42
      8.5   Counterparts....................................................42
      8.6   Entire Agreement; No Third Party Beneficiaries..................42
      8.7   Governing Law...................................................42
      8.8   No Remedy in Certain Circumstances..............................43
      8.9   Assignment......................................................43





                                     -ii-

<PAGE>



                           GLOSSARY OF DEFINED TERMS

Acquisition Proposal........................................   4.2(e)
Affiliates..................................................   5.5
Affiliate Notes.............................................   2.3(b)
Agreement...................................................   Preamble
APL.........................................................   3.1(f)
Arch........................................................   Preamble
Arch Common Stock...........................................   2.1
Arch Employee Benefit Plans.................................   3.1(l)(iii)
Arch ERISA Affiliate........................................   3.1(l)(i)
Arch Intangible Property....................................   3.1(n)
Arch Litigation.............................................   3.1(j)
Arch Order..................................................   3.1(j)
Arch Pension Plans..........................................   3.1(l)(i)
Arch Permits................................................   3.1(i)
Arch Preferred Stock........................................   3.1(b)
Arch Representatives........................................   4.2(a)
Arch SEC Documents..........................................   3.1(d)
Arch Stock Option...........................................   5.8(a)
Arch Stock Plan.............................................   3.1(b)
Average Closing Price.......................................   2.2(e)
Bank Credit Facilities......................................   5.9
CIGNA.......................................................   Recitals
CERCLA......................................................   3.1(o)(A)
Certificate of Merger.......................................   1.1
Certificates................................................   2.2(b)
Closing.....................................................   1.1
Closing Date................................................   1.2
Code........................................................   Recitals
Common Exchange Ratio.......................................   2.1(c)
Confidentiality Agreement...................................   5.2
Constituent Corporations....................................   1.3(a)
Convertible Preferred Stock.................................   Recitals
DGCL........................................................   1.1
Effective Time..............................................   1.1
Environmental Law...........................................   3.1(o)(A)
ERISA.......................................................   3.1(l)(i)
Evaluation Data.............................................   3.1(p)
Executives..................................................   5.7
Exchange Act................................................   3.1(c)(iii)
Exchange Agent..............................................   2.2(a)
Exchange Fund...............................................   2.2(a)





                                    -iii-

<PAGE>



GAAP........................................................   3.1(d)
Governmental Entity.........................................   3.1(c)(iii)
Hazardous Materials.........................................   3.1(o)(B)
HSR Act.....................................................   3.1(c)(iii)
Indemnified Liabilities.....................................   5.17
Indemnified Parties.........................................   5.17
Injunction..................................................   6.1(e)
IRS.........................................................   3.1(k)(iii)
Leases......................................................   3.1(v)
Material Adverse Change.....................................   3.1(a)
Material Adverse Effect.....................................   3.1(a)
Merger......................................................   Recitals
Mezzanine...................................................   Recitals
Notes.......................................................   Recitals
NYSE........................................................   2.2(e)
Oil & Gas Knowledge.........................................   3.1(v)
Oil and Gas Properties......................................   3.1(v)
OSHA........................................................   3.1(m)(ii)
PBGC........................................................   3.1(l)(ii)
Pogo........................................................   Preamble
Pogo Common Stock...........................................   2.1(c)
Pogo Litigation.............................................   3.2(n)
Pogo Order..................................................   3.2(n)
Pogo Preferred Stock........................................   3.2(b)
Pogo SEC Documents..........................................   3.2(d)
Pogo Permits................................................   3.2(m)
Preferred Exchange Ratio....................................   2.1(d)
Pricing Period..............................................   2.1(a)
Proxy Statement.............................................   3.1(c)(iii)
Release.....................................................   3.1(o)(C)
Remedial Action.............................................   3.1(o)(D)
Returns.....................................................   3.1(k)(i)
S-4.........................................................   3.1(e)
SEC.........................................................   3.2(a)
Securities Act..............................................   3.1(d)
Securities Purchase Agreement...............................   2.3(a)
Series A Notes..............................................   Recitals
Series B Notes..............................................   Recitals
Significant Subsidiary......................................   3.2(a)
Stockholder Agreement.......................................   Recitals
Stockholders Meeting........................................   5.3
Surviving Corporation.......................................   1.3(a)
Sub.........................................................   Preamble





                                     -iv-

<PAGE>



Subsidiary..................................................   3.1(a)
Taxes.......................................................   3.1(k)
TDC.........................................................   Recitals
TIC.........................................................   Recitals
TRAL........................................................   Recitals
Voting Debt.................................................   3.1(b)




                                     -v-

<PAGE>



                 SCHEDULES TO THE AGREEMENT AND PLAN OF MERGER

Schedule No.            Description

2.3(b)                  -- Affiliate Notes
3.1(a) -- Significant  Subsidiaries;  Jurisdiction  of  Incorporation  3.1(b) --
Capital  Structure  3.1(c) -- Authority;  No Violations;  Consents and Approvals
3.1(d) -- SEC Documents 3.1(f) -- Absence of Certain Changes or Events 3.1(g) --
No Undisclosed  Material  Liabilities  3.1(h) -- No Default 3.1(i) -- Compliance
with Applicable Laws 3.1(j) -- Litigation 3.1(k)( i), (ii),  (iii),-- Taxes (vi)
3.1(l)(ii),  (v) -- Pension and Benefit Plans;  ERISA  3.1(m)(i),  (ii) -- Labor
Matters 3.1(n) -- Intangible Property 3.1(o) -- Environmental  Matters 3.1(p) --
Proprietary Information 3.1(v) -- Oil and Gas 3.1(w) -- Title to Property 3.1(y)
- -- Leases and Wells 3.1(z) -- Marketing  3.2(b) -- Capital  Structure  3.2(f) --
Absence  of  Certain  Changes  or  Events  3.2(k)  --  No  Undisclosed  Material
Liabilities  3.2(l) -- No Default  3.2(m) --  Compliance  With  Applicable  Laws
3.2(n)  --  Litigation  5.7 --  Employee  Matters  6.3(c)(i)  --  Representation
Certificate of Pogo and Sub

6.3(c)(ii)              -- Representation Certificate of Arch



Exhibit A               -- Form of Affiliate Note
Exhibit B               -- Form of Rule 145 Letter
Exhibit C               -- Form of Affiliate Agreement
Exhibit D               -- Form of Resignation and Release







                                     -vi-

<PAGE>





                         AGREEMENT AND PLAN OF MERGER

      AGREEMENT AND PLAN OF MERGER, dated as of May 28, 1998 (this "Agreement"),
among Pogo Producing Company, a Delaware corporation  ("Pogo"),  Alphac, Inc., a
Delaware  corporation and a direct wholly owned subsidiary of Pogo ("Sub"),  and
Arch Petroleum Inc., a Delaware corporation ("Arch").

      WHEREAS,  the  Boards  of  Directors  of  Pogo,  Sub and  Arch  each  have
determined that it is in the best interests of their respective stockholders for
Sub to merge with and into Arch (the "Merger") upon the terms and subject to the
conditions of this Agreement;

      WHEREAS,   concurrently  with  the  execution  and  delivery  hereof,  (a)
Threshold  Development  Company, a Delaware  corporation  ("TDC"),  the owner of
approximately  13.9%  of the  outstanding  Arch  Common  Stock  (as  hereinafter
defined),  (b) The Travelers Indemnity Company ("TIC"),  the beneficial owner of
436,364  shares of Arch's  8%  Exchangeable  Convertible  Preferred  Stock  (the
"Convertible  Preferred  Stock"),  (c) The  Travelers  Life and Annuity  Company
("TRAL"),  the beneficial owner of $300,000 of Arch's 9.75% Series A Convertible
Subordinated  Notes due 2004 (the  "Series A Notes")  and  $2,700,000  of Arch's
Adjustable  Rate  Series  B  Subordinated  Notes  (the  "Series  B  Notes"  and,
collectively with the Series A Notes, the "Notes"), which Notes are collectively
convertible into 1,090,909 shares of Arch Common Stock, which is all of the Arch
Common Stock that would be beneficially  owned by TRAL, (d) Connecticut  General
Life Insurance  Company  ("CIGNA"),  the beneficial  owner of 39,829.5 shares of
Convertible  Preferred Stock and $27,373 of Series A Notes, $246,361 of Series B
Notes,  which Notes are  collectively  convertible  into  99,540  shares of Arch
Common Stock,  which is all of the Arch Common Stock that would be  beneficially
owned by CIGNA,  (e) CIGNA  Mezzanine  Partners  III,  L.P.  ("Mezzanine"),  the
beneficial owner of 187,454.5 shares of Convertible Preferred Stock, $128,900 of
Series A Notes and  $1,160,100  of Series B Notes,  which Notes are  convertible
into 468,727 shares of Arch Common Stock,  which is all of the Arch Common Stock
that would be beneficially owned by Mezzanine, and (f) The Lincoln National Life
Insurance  Company  ("Lincoln"),  the  beneficial  owner  of  63,625  shares  of
Convertible  Preferred Stock, $43,727 of Series A Notes and $393,539 of Series B
Notes,  which Notes are  convertible  into 159,005 shares of Arch Common Stock ,
which is all of the Arch  Common  Stock  that  would  be  beneficially  owned by
Lincoln,  are  each  entering  into a  Stockholder  Agreement  (individually,  a
"Stockholder  Agreement" and  collectively,  the "Stockholder  Agreements") with
Pogo providing for, among other things,  the voting of the shares of Convertible
Preferred Stock and Arch Common Stock, as applicable, owned by it;

      WHEREAS,  for federal income tax purposes,  it is intended that the Merger
shall qualify as a  reorganization  within the meaning of Section  368(a) of the
Internal Revenue Code of 1986, as amended (the "Code");

      WHEREAS, for accounting  purposes, it is intended that the Merger shall be
accounted for as a pooling of interests; and






<PAGE>



      WHEREAS,  Pogo,  Sub and  Arch  desire  to make  certain  representations,
warranties,  covenants and agreements in connection  with the Merger and also to
prescribe various conditions to the Merger;

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


                                   ARTICLE I

                                  THE MERGER

      1.1 The Merger;  Effective Time of the Merger.  Upon the terms and subject
to the conditions of this Agreement and in accordance with the Delaware  General
Corporation  Law (the  "DGCL"),  Sub shall be  merged  with and into Arch at the
Effective  Time (as  hereinafter  defined).  The Merger shall  become  effective
immediately when a certificate of merger (the "Certificate of Merger"), prepared
and executed in  accordance  with the relevant  provisions of the DGCL, is filed
with the Secretary of State of the State of Delaware (the "Effective Time"). The
filing of the  Certificate  of Merger shall be made as soon as practicable on or
after the closing of the Merger (the "Closing").

      1.2  Closing.  The Closing  shall take place at 10:00 a.m. on a date to be
specified by the parties,  which shall be no later than the second  business day
after  satisfaction  (or waiver in accordance with this Agreement) of the latest
to occur of the conditions set forth in Article VI (the "Closing Date"),  at the
offices of Baker & Botts, L.L.P., One Shell Plaza, 910 Louisiana, Houston, Texas
77002, unless another date or place is agreed to in writing by the parties.

      1.3 Effects of the Merger.  (a) At the  Effective  Time:  (i) Sub shall be
merged with and into Arch,  the  separate  existence of Sub shall cease and Arch
shall continue as the surviving corporation (Sub and Arch are sometimes referred
to herein as the "Constituent  Corporations"  and Arch is sometimes  referred to
herein as the "Surviving Corporation"); (ii) the Certificate of Incorporation of
Sub shall be the  Certificate  of  Incorporation  of the Surviving  Corporation;
(iii) the Bylaws of Sub as in effect  immediately  prior to the  Effective  Time
shall be the  Bylaws  of the  Surviving  Corporation;  and  (iv)  the  Surviving
Corporation shall succeed to and assume all of the rights and obligations of Sub
in accordance with the DGCL.

      (b) The directors and officers of Sub at the  Effective  Time shall,  from
and after the  Effective  Time,  be the initial  directors  and  officers of the
Surviving  Corporation,  and such directors and officers shall serve until their
successors  have been duly  elected or  appointed  and  qualified or until their
earlier  death,   resignation  or  removal  in  accordance  with  the  Surviving
Corporation's Certificate of Incorporation and Bylaws.






                                      2

<PAGE>



                                  ARTICLE II

            EFFECT OF THE MERGER ON THE CAPITAL STOCK AND CERTAIN
                INDEBTEDNESS OF THE CONSTITUENT CORPORATIONS;
                           EXCHANGE OF CERTIFICATES

      2.1 Effect on  Capital  Stock.  At the  Effective  Time,  by virtue of the
Merger and  without any action on the part of the holder of any shares of common
stock,  par value $0.01 per share,  of Arch ("Arch Common  Stock"),  Convertible
Preferred Stock or capital stock of Sub:

            (a) Capital Stock of Sub. Each issued and  outstanding  share of the
      common stock of Sub shall be  converted  into and become 10 fully paid and
      nonassessable  shares of common stock,  par value $0.01 per share,  of the
      Surviving Corporation.

            (b) Cancellation of Treasury Stock.  Each share of Arch Common Stock
      and all other  shares of  capital  stock of Arch that are owned by Arch as
      treasury  stock of Arch shall be  canceled  and retired and shall cease to
      exist  and  no  Pogo  Common  Stock  (as  hereinafter  defined)  or  other
      consideration shall be delivered or deliverable in exchange therefor.

            (c) Exchange Ratio for Arch Common Stock.  Each share of Arch Common
      Stock  issued and  outstanding  immediately  prior to the  Effective  Time
      (other than shares to be canceled in accordance with Section 2.1(b)) shall
      be converted into 0.09615 of a duly authorized, validly issued, fully paid
      and  nonassessable  share of common stock,  par value $1.00 per share,  of
      Pogo,  together with any associated right to acquire shares of Pogo Series
      A Junior  Convertible  Preferred  Stock  (collectively,  the "Pogo  Common
      Stock"),  such  0.09615 of a share of Pogo Common  Stock for each share of
      Arch Common Stock being referred to herein as the "Common Exchange Ratio".
      All such shares of Arch Common Stock,  when so converted,  shall no longer
      be outstanding and shall  automatically  be canceled and retired and shall
      cease to exist,  and each holder of a  certificate  representing  any such
      shares  shall cease to have any rights with  respect  thereto,  except the
      right to  receive  the  shares  of Pogo  Common  Stock and cash in lieu of
      fractional  shares of Pogo Common Stock as contemplated by Section 2.2(e),
      to be issued or paid in consideration  therefor upon the surrender of such
      certificate in accordance with Section 2.2, without interest.

            (d) Exchange Ratio for Convertible  Preferred  Stock.  Each share of
      Convertible  Preferred Stock issued and outstanding  immediately  prior to
      the Effective  Time shall be converted  into 0.9615 of a duly  authorized,
      validly issued,  fully paid and non-assessable share of Pogo Common Stock,
      such  0.9615  of a share  of Pogo  Common  Stock  for  each  share of Arch
      Convertible  Preferred  Stock being  referred to herein as the  "Preferred
      Exchange Ratio".  All such shares of Convertible  Preferred Stock, when so
      converted,  shall no longer be  outstanding  and  shall  automatically  be
      canceled  and  retired  and  shall  cease to exist,  and each  holder of a
      certificate  representing  any such shares  shall cease to have any rights
      with  respect  thereto,  except  the right to  receive  the shares of Pogo
      Common Stock and cash in lieu of fractional shares of Pogo Common Stock as
      contemplated  by  Section  2.2(e),  to be issued or paid in  consideration
      therefor upon the surrender of such certificate in accordance with Section
      2.2, without interest. Accrued but unpaid dividends on each share




                                      3

<PAGE>



      of Convertible  Preferred Stock through the Effective Time, whether or not
      declared, shall be paid in cash at the Effective Time.

            (e) Treatment of Stock Options.  Each  outstanding Arch Stock Option
      (as defined in Section 5.8) shall be treated as provided in Section 5.8.

      2.2   Exchange of Certificates.

      (a) Exchange Agent. As of the Effective Time, Pogo shall deposit, or cause
to be deposited,  with Pogo's transfer agent for Pogo Common Stock or such other
bank or trust company designated by Pogo and reasonably  acceptable to Arch (the
"Exchange Agent"), for the benefit of the holders of shares of Arch Common Stock
and Convertible  Preferred  Stock,  for exchange in accordance with this Article
II, through the Exchange  Agent,  certificates  representing  the shares of Pogo
Common Stock (such shares of Pogo Common  Stock,  together with any dividends or
distributions  with  respect  thereto,  being  hereinafter  referred  to as  the
"Exchange  Fund")  issuable  pursuant to Section 2.1 in exchange for outstanding
shares of Arch Common Stock and Convertible  Preferred Stock, together with cash
in lieu of  fractional  shares as provided  herein.  The  Exchange  Agent shall,
pursuant to irrevocable instructions, deliver the Pogo Common Stock contemplated
to be issued pursuant to Section 2.1 out of the Exchange Fund. The Exchange Fund
shall not be used for any other purpose.

      (b)  Exchange  Procedures.  As soon as  reasonably  practicable  after the
Effective  Time,  the  Exchange  Agent  shall mail to each holder of record of a
certificate or  certificates  which,  immediately  prior to the Effective  Time,
represented  outstanding  shares of Arch Common Stock or  Convertible  Preferred
Stock,  as the case may be (the  "Certificates"),  which holder's shares of Arch
Common Stock and  Convertible  Preferred  Stock were converted into the right to
receive  shares of Pogo Common  Stock  pursuant to Section  2.1: (i) a letter of
transmittal  (which shall  specify that  delivery  shall be effected and risk of
loss and  title  to the  Certificates  shall  pass  only  upon  delivery  of the
Certificates  to the  Exchange  Agent,  and  shall be in such form and have such
other provisions as Pogo may reasonably specify);  and (ii) instructions for use
in effecting  the  surrender of the  Certificates  in exchange for  certificates
representing  shares of Pogo Common Stock.  Upon surrender of a Certificate  for
cancellation  to the  Exchange  Agent or to such other agent or agents as may be
appointed by Pogo, together with such letter of transmittal,  duly executed, and
any other required  documents,  the holder of such Certificate shall be entitled
to receive in exchange therefor a certificate  representing that number of whole
shares of Pogo Common Stock which such holder has the right to receive  pursuant
to the  provisions of this Article II and cash in lieu of  fractional  shares of
Pogo Common Stock as  contemplated  by Section  2.2(e),  and the  Certificate so
surrendered shall forthwith be canceled. In the event of a transfer of ownership
of Arch Common Stock or Convertible  Preferred  Stock which is not registered in
the transfer records of Arch, a certificate  representing the appropriate number
of shares of Pogo Common Stock may be issued to a transferee if the  Certificate
representing such Arch Common Stock or Convertible  Preferred Stock is presented
to the Exchange  Agent  accompanied  by all  documents  required to evidence and
effect such transfer and by evidence that any  applicable  stock  transfer taxes
have been paid.  Until  surrendered  as  contemplated  by this Section 2.2, each
Certificate  shall be deemed at any time after the  Effective  Time to represent
only the right to  receive  upon such  surrender  the  certificate  representing
shares of Pogo Common  Stock and cash in lieu of any  fractional  shares of Pogo
Common Stock as contemplated by this Section 2.2.




                                      4

<PAGE>



The  Exchange  Agent shall not be  entitled  to vote or  exercise  any rights of
ownership  with  respect to the Pogo  Common  Stock held by it from time to time
hereunder,  except  that it  shall  receive  and  hold  all  dividends  or other
distributions  paid or  distributed  with  respect  thereto  for the  account of
persons entitled thereto.

      (c)  Distributions  with Respect to  Unexchanged  Shares.  No dividends or
other distributions with respect to Pogo Common Stock declared or made after the
Effective  Time with a record date after the Effective Time shall be paid to the
holder of any  unsurrendered  Certificate  with  respect to the right to receive
shares of Pogo Common Stock  represented  thereby and no cash payment in lieu of
fractional  shares shall be paid to any such holder  pursuant to Section  2.2(e)
until the holder of such Certificate shall surrender such  Certificate.  Subject
to the effect of applicable laws,  following  surrender of any such Certificate,
there shall be paid to the holder thereof,  without interest: (i) at the time of
such surrender,  the amount of any cash payable in lieu of a fractional share of
Pogo Common  Stock to which such holder is entitled  pursuant to Section  2.2(e)
and the amount of dividends or other  distributions with a record date after the
Effective Time theretofore paid with respect to such whole shares of Pogo Common
Stock;  and (ii) at the  appropriate  payment  date,  the amount of dividends or
other  distributions  with a record date after the  Effective  Time but prior to
surrender  and a payment date  subsequent  to surrender  payable with respect to
such whole shares of Pogo Common Stock.

      (d) No  Further  Ownership  Rights  in Arch  Common  Stock or  Convertible
Preferred  Stock.  All shares of Pogo Common Stock issued upon the surrender for
exchange  of shares of Arch  Common  Stock and  Convertible  Preferred  Stock in
accordance  with the terms hereof  (including  any cash paid pursuant to Section
2.2(c) or 2.2(e))  shall be deemed to have been issued in full  satisfaction  of
all  rights  pertaining  to such  shares of Arch  Common  Stock and  Convertible
Preferred  Stock, as applicable,  and after the Effective Time there shall be no
further  registration  of transfers on the stock transfer books of the Surviving
Corporation  of the shares of Arch Common Stock or Convertible  Preferred  Stock
that were  outstanding  immediately  prior to the Effective  Time. If, after the
Effective Time,  Certificates are presented to the Surviving Corporation for any
reason, they shall be canceled and exchanged as provided in this Article II.

      (e) No Fractional Shares. Prior to determining if any fractional shares of
Pogo Common Stock are due to a holder of either Arch Common Stock or Convertible
Preferred  Stock,  the number of shares of Pogo  Common  Stock to be received by
such holder on account of all shares of both Arch Common  Stock and  Convertible
Preferred  Stock held by such holder shall be aggregated.  In the event that any
such  holder  is  still  due  a  fractional  share  of  Pogo  Common  Stock,  no
certificates or scrip  representing  such fractional  share of Pogo Common Stock
shall be issued upon the surrender for exchange of Certificates pursuant to this
Article II, and, except as provided in this Section 2.2(e), no dividend or other
distribution,  stock  split or  interest  shall  relate  to any such  fractional
security,  and such  fractional  interest shall not entitle the owner thereof to
vote or to any rights of a security  holder of Pogo.  In lieu of any  fractional
security,  each holder of shares of Arch Common Stock and Convertible  Preferred
Stock who would  otherwise  have been  entitled to a fraction of a share of Pogo
Common  Stock upon  surrender  of  Certificates  for  exchange  pursuant to this
Article  II will be paid an  amount  in cash  (without  interest)  equal  to the
Average  Closing Price  multiplied by the  fractional  interest the holder would
otherwise be entitled to receive. "Average Closing Price" shall mean the average
of the per  share  closing  prices  of Pogo  Common  Stock  as  reported  on the
consolidated




                                      5

<PAGE>



transaction  reporting  system  for  securities  traded  on the New  York  Stock
Exchange,   Inc.  ("NYSE")  for  the  twenty  consecutive  trading  days  ending
immediately  prior to the  second  trading  day prior to the  Closing  Date (the
"Pricing Period"),  appropriately  adjusted for any stock splits,  reverse stock
splits, stock dividends, recapitalizations or similar transactions.

      (f) Termination of Exchange Fund. Any portion of the Exchange Fund and any
cash in lieu of  fractional  shares of Pogo Common  Stock made  available to the
Exchange Agent that remain  undistributed to the former stockholders of Arch for
one year after the Effective Time shall be delivered to Pogo,  upon demand,  and
any stockholders of Arch who have not theretofore  complied with this Article II
shall  thereafter  look only to Pogo for  payment of their claim for Pogo Common
Stock,  any cash in lieu of  fractional  shares  of Pogo  Common  Stock  and any
dividends or distributions with respect to Pogo Common Stock.

      (g) No  Liability.  Neither Pogo nor Arch shall be liable to any holder of
shares of Arch Common Stock,  Convertible  Preferred Stock or Pogo Common Stock,
as the case may be, for such shares (or dividends or distributions  with respect
thereto) or cash in lieu of fractional  shares of Pogo Common Stock delivered to
a public  official  pursuant to any applicable  abandoned  property,  escheat or
similar law.

      2.3   Effect on Certain Indebtedness.

      (a) Conversion of the Notes. At the Effective Time, TRAL,  CIGNA,  Lincoln
and  Mezzanine,  being all of the holders of the Notes,  shall each  convert the
Notes owned by it into such number of shares of Pogo Common Stock as is equal to
(i) the unpaid principal amount of such Notes divided by (ii) $2.75 per share of
Arch Common Stock, multiplied by (iii) the Common Exchange Ratio. The conversion
price for the Notes  will also be  subject,  if  applicable,  to  adjustment  as
described  in Section 11.3 of the  Securities  Purchase  Agreement,  dated as of
October  15,  1994,  by and  between  the  holder  of such  Note and  Arch  (the
"Securities Purchase Agreement") as a result of any events that occur because of
actions taken by Arch or Pogo from and after the date of this Agreement. Accrued
unpaid interest on each Note through the Effective  Time,  shall be paid in cash
at the  Effective  Time.  In  addition,  cash shall be  payable to TRAL,  CIGNA,
Lincoln and  Mezzanine  in lieu of any  fractional  interests  that such parties
would otherwise be entitled pursuant to the foregoing conversion,  calculated in
a manner similar to that set forth in Section 2.2(e) hereof.

      (b) Affiliate  Notes. At the Effective  Time, all of the notes  receivable
from,  and  loans  to,  officers  of Arch set  forth  on  Schedule  2.3(b)  (the
"Affiliate  Notes")  shall  be,  at the  officer's  choice,  (i)  repaid in full
(including  principal  and accrued  interest  through the Closing  Date) or (ii)
amended  and  restated  in  substantially  the  form of the  note  and  security
agreement set forth as Exhibit A hereto.






                                      6

<PAGE>



                                  ARTICLE III

                        REPRESENTATIONS AND WARRANTIES

      3.1  Representations  and Warranties of Arch. Arch represents and warrants
to Pogo and Sub on its own behalf and on behalf of each of its  Subsidiaries  as
follows:

      (a)  Organization,  Standing and Power.  Each of Arch and its Subsidiaries
(as  hereinafter  defined) is a corporation  or limited  liability  company duly
organized,  validly existing and in good standing under the laws of its state or
jurisdiction  of  incorporation  or  organization,  has all requisite  power and
authority to own,  lease and operate its properties and to carry on its business
as now  being  conducted,  and is  duly  qualified  and in good  standing  to do
business in each  jurisdiction  in which the business it is  conducting,  or the
operation,  ownership  or leasing of its  properties,  makes such  qualification
necessary,  other  than in such  jurisdictions  where the  failure so to qualify
would not have a Material  Adverse Effect (as defined  below) on Arch.  Arch has
heretofore  delivered to Pogo complete and correct copies of its  Certificate of
Incorporation, as amended and corrected and Bylaws. All Subsidiaries of Arch and
their  respective  jurisdictions of incorporation or organization are identified
on Schedule  3.1(a).  As used in this Agreement a "Material  Adverse  Effect" or
"Material  Adverse  Change" shall mean,  in respect of Arch,  Pogo, or any named
Subsidiary of either party, as the case may be, any effect or change that is or,
as far as can be reasonably  determined,  is reasonably likely to be, materially
adverse to the business,  operations, assets, condition (financial or otherwise)
or results of operation of such party and its Subsidiaries  taken as a whole. As
used in this  Agreement,  "Subsidiary"  means,  with  respect to any party,  any
corporation or other organization,  whether  incorporated or unincorporated,  of
which: (i) such party or any other Subsidiary of such party is a general partner
(excluding partnerships,  the general partnership interests of which are held by
such party or any  Subsidiary  of such party that do not have a majority  of the
voting  interest  in  such  partnership);  or (ii) at  least a  majority  of the
securities or other  interests  having by their terms  ordinary  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,  owned  or  controlled  by such  party  or by any one or more of its
Subsidiaries, or by such party and any one or more of its Subsidiaries.

      (b) Capital Structure. As of the date hereof, the authorized capital stock
of Arch consists of 50,000,000  shares of Arch Common Stock and 1,000,000 shares
of preferred stock, par value $0.01 per share ("Arch Preferred  Stock").  At the
close of business on March 31, 1998: (i) 17,321,804  shares of Arch Common Stock
and  727,273  shares of Arch  Preferred  Stock  (all of which  were  Convertible
Preferred Stock) were issued and outstanding, (ii) 339,300 shares of Arch Common
Stock were reserved for issuance  pursuant to  outstanding  options under Arch's
Stock Option Plan (the "Arch Stock Plan"), (iii) 7,272,727 shares of Arch Common
Stock were reserved for issuance upon  conversion of the  Convertible  Preferred
Stock pursuant to the Securities Purchase Agreement, (iv) 100,000 shares of Arch
Common Stock were held by Arch in its  treasury;  and (v),  except for 1,818,181
shares of Arch Common Stock  reserved for issuance upon  conversion of the Notes
pursuant to the Securities Purchase Agreement, no other bonds, debentures, notes
or other  indebtedness  having the right to vote (or convertible into securities
having  the  right to  vote)  on any  matters  on  which  stockholders  may vote
(collectively,  including the Notes,  "Voting  Debt") were issued or outstanding
with respect to Arch. Except as set forth on Schedule 3.1(b), all outstanding




                                      7

<PAGE>



shares of Arch Common Stock are validly issued, fully paid and nonassessable and
were not issued in violation of any  preemptive  rights.  Except as set forth on
Schedule 3.1(b),  all outstanding shares of capital stock of the Subsidiaries of
Arch are owned by Arch, or a direct or indirect wholly owned Subsidiary of Arch,
free and clear of all liens,  charges,  encumbrances,  claims and options of any
nature.  Except as set forth in this  Section  3.1(b) or on Schedule  3.1(b) and
except for changes since March 31, 1998  resulting from the exercise of employee
stock options granted  pursuant to the Arch Stock Plan, there are outstanding or
reserved  for  issuance:  (i) no shares of capital  stock,  Voting Debt or other
voting  securities of Arch; (ii) no securities of Arch or any Subsidiary of Arch
convertible  into or  exchangeable  for shares of capital stock,  Voting Debt or
other voting securities of Arch or any Subsidiary of Arch; and (iii) no options,
warrants, calls, rights (including preemptive rights), commitments or agreements
to which  Arch or any  Subsidiary  of Arch is a party or by which it is bound in
any case  obligating  Arch or any  Subsidiary of Arch to issue,  deliver,  sell,
purchase, redeem or acquire, or cause to be issued, delivered,  sold, purchased,
redeemed or acquired,  additional  shares of capital stock or any Voting Debt or
other voting securities of Arch or of any Subsidiary of Arch, or obligating Arch
or any  Subsidiary  of Arch to  grant,  extend  or enter  into any such  option,
warrant,  call,  right,  commitment  or  agreement.  Except for the  Stockholder
Agreements  or as set  forth on  Schedule  3.1(b),  there are not as of the date
hereof and there will not be at the Effective Time any  stockholder  agreements,
voting trusts or other agreements or  understandings to which Arch is a party or
of which Arch is aware relating to the voting of any shares of the capital stock
of Arch that will limit in any way the  solicitation  of proxies by or on behalf
of Arch from, or the casting of votes by, the  stockholders of Arch with respect
to the Merger. Except as set forth on Schedule 3.1(b), there are no restrictions
on Arch to vote the stock of any of its Subsidiaries.

      (c)   Authority; No Violations; Consents and Approvals.

            (i) The Board of Directors of Arch has unanimously approved (subject
to approval by the  stockholders of Arch in accordance with the DGCL) the Merger
and this  Agreement and declared the Merger and this Agreement to be in the best
interests of the  stockholders of Arch.  Arch has all requisite  corporate power
and  authority  to enter  into this  Agreement  and,  subject,  with  respect to
consummation of the Merger,  to approval of this Agreement and the Merger by the
stockholders of Arch in accordance with the DGCL, to consummate the transactions
contemplated  hereby.  The  execution  and  delivery of this  Agreement  and the
consummation of the transactions  contemplated  hereby have been duly authorized
by all necessary corporate action on the part of Arch, subject,  with respect to
consummation of the Merger,  to approval of this Agreement and the Merger by the
stockholders  of Arch in accordance  with the DGCL. This Agreement has been duly
executed and delivered by Arch and, subject, with respect to consummation of the
Merger, to approval of this Agreement and the Merger by the stockholders of Arch
in accordance  with the DGCL, and assuming this Agreement  constitutes the valid
and  binding  obligation  of Pogo  and  Sub,  constitutes  a valid  and  binding
obligation of Arch  enforceable  in accordance  with its terms,  subject,  as to
enforceability,  to  bankruptcy,  insolvency,  reorganization  and other laws of
general applicability  relating to or affecting creditors' rights and to general
principles of equity.

            (ii)  Except as set forth on  Schedule  3.1(c),  the  execution  and
delivery of this Agreement does not, and the  consummation  of the  transactions
contemplated hereby and compliance with the provisions hereof will not, conflict
with, or result in any violation of, or default (with or without notice or lapse
of time, or both) under, or give rise to a right of termination, cancellation




                                      8

<PAGE>



or acceleration of any obligation or to the loss of a material benefit under, or
give rise to a right of  purchase  under,  result in the  creation  of any lien,
security interest, charge or encumbrance upon any of the properties or assets of
Arch or any of its  Subsidiaries  under,  or otherwise  result in a detriment to
Arch or any of its  Subsidiaries  under, any provision of (A) the Certificate of
Incorporation,  as amended and corrected,  or Bylaws of Arch or any provision of
the comparable  charter or organizational  documents of any of its Subsidiaries,
(B) any loan or credit  agreement,  note, bond,  mortgage,  indenture,  lease or
other agreement (including, without limitation, any pre-emptive rights or rights
of first  refusal with respect to oil and gas  interests),  instrument,  permit,
concession,  franchise or license applicable to Arch or any of its Subsidiaries,
(C)  any  joint  operating   agreement  or  joint  venture  or  other  ownership
arrangement or (D) assuming the consents,  approvals,  authorizations or permits
and filings or  notifications  referred to in Section  3.1(c)(iii)  are duly and
timely obtained or made and the approval of the Merger and this Agreement by the
stockholders of Arch has been obtained,  any judgment,  order, decree,  statute,
law, ordinance, rule or regulation applicable to Arch or any of its Subsidiaries
or any of their  respective  properties  or assets,  other than,  in the case of
clause (B), (C) or (D), any such conflicts, violations, defaults, rights, liens,
security interests, charges, encumbrances or detriments that, individually or in
the  aggregate,  would not have a Material  Adverse Effect on Arch or materially
impair the ability of Arch to perform its  obligations  hereunder or prevent the
consummation of any of the transactions contemplated hereby. Notwithstanding the
foregoing, no representation or warranty is made with respect to Evaluation Data
(as hereinafter defined), which is covered exclusively by Section 3.1(p).

            (iii)  No  consent,   approval,   order  or  authorization   of,  or
registration,   declaration   or  filing   with,   or  permit  from  any  court,
governmental,  regulatory  or  administrative  agency  or  commission  or  other
governmental authority or instrumentality,  domestic or foreign (a "Governmental
Entity"),  is required by or with respect to Arch or any of its  Subsidiaries in
connection  with the  execution  and  delivery of this  Agreement by Arch or the
consummation by Arch of the transactions  contemplated  hereby,  as to which the
failure to obtain or make would have a Material  Adverse Effect on Arch,  except
for:  (A) the  filing  of a  premerger  notification  report  by Arch  under the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  as  amended  (the "HSR
Act"),  and the expiration or termination of the applicable  waiting period with
respect thereto; (B) the appropriate filings or notifications as may be required
by Canadian  laws;  (C) the filing with the SEC (as defined  hereafter) of (x) a
proxy  statement in preliminary  and definitive form (including any amendment or
supplements  thereto) on Form S-4 of the Securities Act (as hereinafter defined)
relating to the meeting of Arch's stockholders to be held in connection with the
Merger (the "Proxy  Statement")  and any other filings as may be required  under
the  Securities  Act and (y) such reports under Section 13(a) of the  Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and such other compliance
with the  Exchange  Act and the  rules  and  regulations  thereunder,  as may be
required in connection  with this  Agreement and the  transactions  contemplated
hereby;  (D) the filing of the Certificate of Merger with the Secretary of State
of the State of Delaware;  (E) such filings and  approvals as may be required by
any applicable state  securities,  "blue sky" or takeover laws, or environmental
laws;  and (F) such  filings  and  approvals  as may be  required by any foreign
premerger notification, securities, corporate or other law, rule or regulation.

      (d) SEC  Documents.  Arch has made  available  to Pogo a true and complete
copy of each report,  schedule,  registration  statement  and  definitive  proxy
statement  filed by Arch with the SEC since  December  31, 1997 and prior to the
date of this Agreement (the "Arch SEC Documents")




                                      9

<PAGE>



which are all the documents  (other than  preliminary  materials)  that Arch was
required  to file  with the SEC  during  such  period.  Except as  disclosed  on
Schedule 3.1(d), as of their respective  dates, the Arch SEC Documents  complied
in all material respects with the requirements of the Securities Act of 1933, as
amended (the "Securities Act"), or the Exchange Act, as the case may be, and the
rules  and  regulations  of the  SEC  thereunder  applicable  to such  Arch  SEC
Documents,  and none of the Arch SEC Documents contained any untrue statement of
a  material  fact or  omitted to state a  material  fact  required  to be stated
therein  or  necessary  to  make  the  statements   therein,  in  light  of  the
circumstances  under  which  they  were  made,  not  misleading.  The  financial
statements of Arch included in the Arch SEC Documents complied as to form in all
material  respects  with the  published  rules and  regulations  of the SEC with
respect thereto,  were prepared in accordance with generally accepted accounting
principles  ("GAAP")  applied on a consistent  basis during the periods involved
(except  as may be  indicated  in the  notes  thereto  or,  in the  case  of the
unaudited  statements,  as permitted by Rule 10-01 of Regulation S-X of the SEC)
and fairly present in accordance with applicable  requirements of GAAP (subject,
in the case of the unaudited  statements,  to normal year-end  adjustments,  any
other adjustments  described therein,  and the fact that certain information and
notes have been condensed or omitted in accordance with the Exchange Act and the
rules  and  regulations   promulgated  thereunder)  the  consolidated  financial
position of Arch and its consolidated  Subsidiaries as of their respective dates
and the consolidated  results of operations and the  consolidated  cash flows of
Arch and its consolidated  Subsidiaries for the periods presented  therein.  For
purposes of this Section 3.1(d),  any amendment to any information  contained in
any  Arch  SEC  document  duly  filed  with  the SEC  prior  to the date of this
Agreement  shall be deemed to have been filed on the date that the original Arch
SEC  Document  being  amended  was filed.  Except as  disclosed  in the Arch SEC
Documents  or in  Schedule  3.1(d),  there are no  agreements,  arrangements  or
understandings  between Arch and any party who is at the date of this  Agreement
or was at any time  prior to the date  hereof  but after  December  31,  1997 an
Affiliate of Arch that are required to be disclosed in the Arch SEC Documents.

      (e)  Information  Supplied.  None  of the  information  supplied  or to be
supplied by Arch for inclusion or incorporation by reference in the Registration
Statement  on Form S-4 to be filed with the SEC by Pogo in  connection  with the
issuance of shares of Pogo Common Stock in the Merger (the "S-4")  will,  at the
time the S-4 becomes  effective  under the  Securities  Act or at the  Effective
Time,  contain  any untrue  statement  of a  material  fact or omit to state any
material fact required to be stated  therein or necessary to make the statements
therein not misleading,  and none of the information  supplied or to be supplied
by Arch and included or  incorporated  by reference in the Proxy Statement will,
at the date mailed to stockholders of Arch or at the time of the meeting of such
stockholders  to be held in connection with the Merger or at the Effective Time,
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated  therein or necessary in order to make the statements
therein,  in  light  of  the  circumstances  under  which  they  are  made,  not
misleading. If at any time prior to the Effective Time any event with respect to
Arch or any of its Subsidiaries,  or with respect to other information  supplied
by Arch for  inclusion in the Proxy  Statement or the S-4,  shall occur which is
required to be  described  in an  amendment  of, or a  supplement  to, the Proxy
Statement or the S-4,  such event shall be so described,  and such  amendment or
supplement  shall  be  promptly  filed  with the SEC and,  as  required  by law,
disseminated to the stockholders of Arch.





                                      10

<PAGE>



      (f)  Absence of Certain  Changes or  Events.  Except as  disclosed  in, or
reflected in the financial  statements included in, the Arch SEC Documents or on
Schedule 3.1(f), or except as contemplated by this Agreement, since December 31,
1997, there has not been: (i) any  declaration,  setting aside or payment of any
dividend or other distribution (whether in cash, stock or property) with respect
to any of Arch's capital  stock;  (ii) any amendment of any material term of any
outstanding  equity  security of Arch or any  Subsidiary;  (iii) any repurchase,
redemption or other  acquisition  by Arch or any  Subsidiary of any  outstanding
shares of  capital  stock or other  equity  securities  of,  or other  ownership
interests in, Arch or any  Subsidiary,  except as  contemplated by Arch Employee
Benefit  Plans;  (iv)  any  material  change  in any  method  of  accounting  or
accounting  practice  or any tax  method,  practice  or  election by Arch or any
Subsidiary;  (v)  options  granted  under  the  Arch  Stock  Plan  or any  other
agreement; or (vi) any other transaction,  commitment, dispute or other event or
condition  (financial  or  otherwise)  of any  character  (whether or not in the
ordinary  course of business)  that has had a Material  Adverse Effect on either
Arch or Arch Petroleum Ltd., a Canadian corporation ("APL").

      (g) No Undisclosed Material Liabilities.  Except as disclosed or reflected
in the Arch SEC Documents or on Schedule 3.1(g), as of the date hereof,  neither
Arch  nor any of its  Subsidiaries  has  incurred  any  liabilities  of any kind
whatsoever, whether accrued, contingent,  absolute, determined,  determinable or
otherwise,  that  would have a Material  Adverse  Effect on either  Arch or APL,
other than liabilities under this Agreement.

      (h) No Default.  Neither Arch nor any of its Subsidiaries is in default or
violation (and no event has occurred which,  with notice or the lapse of time or
both,  would  constitute  a default  or  violation)  of any term,  condition  or
provision of (i) their respective charter, organizational documents and by-laws,
(ii)  except  as  disclosed  in  Schedule  3.1(h),  any  note,  bond,  mortgage,
indenture, license, agreement or other instrument or obligation to which Arch or
any  of  its  Subsidiaries  is  now a  party  or by  which  Arch  or  any of its
Subsidiaries  or any of their  respective  properties  or assets may be bound or
(iii)  any  order,  writ,  injunction,   decree,  statute,  rule  or  regulation
applicable  to Arch or any of its  Subsidiaries,  except in the case of (ii) and
(iii)  for  defaults  or  violations  which in the  aggregate  would  not have a
Material Adverse Effect on either Arch or APL.

      (i) Compliance with Applicable  Laws. Arch and its  Subsidiaries  hold all
permits, licenses,  variances,  exemptions,  orders, franchises and approvals of
all Governmental  Entities  necessary for the lawful conduct of their respective
businesses (the "Arch  Permits"),  except where the failure so to hold would not
have a Material  Adverse Effect on either Arch or APL. Arch and its Subsidiaries
are in compliance  with the terms of the Arch Permits,  except where the failure
so to comply  would not have a Material  Adverse  Effect on either  Arch or APL.
Except as disclosed in the Arch SEC Documents or as set forth on the  disclosure
schedules  hereto,  the  businesses of Arch and its  Subsidiaries  are not being
conducted in violation of any law,  ordinance or regulation of any  Governmental
Entity,  except for possible  violations which would not have a Material Adverse
Effect on either Arch or APL. Except as set forth on Schedule 3.1(i),  as of the
date of this Agreement,  no investigation  or review by any Governmental  Entity
with respect to Arch or any of its  Subsidiaries is pending or, to the knowledge
of Arch as of the date hereof, threatened, other than those the outcome of which
would not have a Material Adverse Effect on either Arch or APL.  Schedule 3.1(i)
sets forth each such  failure to hold or comply with the terms of Arch  Permits,
each such violation of law,  ordinance or regulation of any Governmental  Entity
and each such pending




                                      11

<PAGE>



or threatened investigation or review by any Governmental Entity existing on the
date hereof that  involves  amounts in excess of $100,000,  notwithstanding  the
fact that such failure to hold or comply or such violation of law,  ordinance or
regulation may not constitute a Material Adverse Effect on either Arch or APL.

      (j)  Litigation.  Except  as  disclosed  in the Arch SEC  Documents  or on
Schedule 3.1(j) hereto,  there is no suit, action or proceeding pending,  or, to
the  best  knowledge  of  Arch,  threatened  against  or  affecting  Arch or any
Subsidiary of Arch ("Arch  Litigation"),  and Arch and its Subsidiaries  have no
knowledge of any facts that are likely to give rise to any Arch Litigation, that
(in any case)  would have a Material  Adverse  Effect on Arch,  nor is there any
judgment,  decree,  injunction,  rule or order  of any  Governmental  Entity  or
arbitrator  outstanding  against Arch or any  Subsidiary of Arch ("Arch  Order")
that would  have a  Material  Adverse  Effect on Arch or  materially  impair the
ability of Arch to consummate the  transactions  contemplated by this Agreement.
Notwithstanding  the fact that the uninsured exposure or losses under all claims
and judgments  pending may not constitute a Material Adverse Effect on Arch, the
aggregate  reasonable estimate of uninsured exposures or losses under all claims
and  judgments  pending,  or to the  knowledge  of Arch as of the  date  hereof,
threatened,  pursuant to all Arch  Litigation  and Arch Orders,  existing on the
date hereof,  excluding  individual,  unrelated claims or judgments of less than
$10,000 each, does not exceed $100,000.

      (k)   Taxes.

            (i) Except as set forth on Schedule 3.1(k)(i), each of Arch, each of
its Subsidiaries and any affiliated,  consolidated, combined, unitary or similar
group of which any such  corporation  or limited  liability  company is or was a
member has (A) duly filed on a timely basis (taking into account any extensions)
all  federal  and  all  material  state,  local,   foreign  and  other  returns,
declarations, reports, estimates, information returns and statements ("Returns")
required  to be filed or sent by or with  respect  to it in respect of any Taxes
(as hereinafter defined), (B) duly paid or deposited on a timely basis all Taxes
that are due and payable  (except to the extent not material in the aggregate or
to the extent that  liability  therefor  is  reserved  for in Arch's most recent
audited  financial  statements) for which Arch or any of its Subsidiaries may be
liable, (C) established  reserves that are adequate for the payment of all Taxes
not yet due and payable  with respect to the results of  operations  of Arch and
its  Subsidiaries  through the date  hereof,  and (D)  complied in all  material
respects  with all  applicable  laws,  rules  and  regulations  relating  to the
reporting,  payment and  withholding  of Taxes and has in all material  respects
timely  withheld  from employee  wages and paid over to the proper  governmental
authorities all amounts required to be so withheld and paid over.

            (ii)  Schedule  3.1(k)(ii)  sets forth (A) the last  taxable  period
through which the federal income Tax Returns of Arch and any of its Subsidiaries
have been examined by the Internal  Revenue  Service  ("IRS") or, in the case of
APL, Revenue Canada,  or otherwise closed and (B) any affiliated,  consolidated,
combined,  unitary  or  similar  group or  Return  in  which  Arch or any of its
Subsidiaries  is or has been a member or is or has joined in the filing.  Except
to the extent being contested in good faith, all material  deficiencies asserted
as a result of such  examinations  and any examination by any applicable  taxing
authority  have been paid,  fully settled or  adequately  provided for in Arch's
most recent audited financial  statements.  Except as adequately provided for in
the Arch SEC Documents,  no material audits or other administrative  proceedings
or court proceedings




                                      12

<PAGE>



are  presently  pending  with  regard to any Taxes for which  Arch or any of its
Subsidiaries would be liable, and no material  deficiency for any Taxes has been
proposed in writing or assessed pursuant to such examination against Arch or any
of its  Subsidiaries  by any authority  with respect to any period other than as
set forth in Schedule 3.1(k)(ii).

            (iii) Except as disclosed on Schedule 3.1(k)(iii),  neither Arch nor
any of its  Subsidiaries  has executed or entered into (or prior to the close of
business  on the  Closing  Date will  execute or enter into) with the IRS or any
taxing  authority  (i) any agreement or other  document  extending or having the
effect of extending  the period for  assessments  or collection of any income or
franchise  Taxes for which  Arch or any of its  Subsidiaries  would be liable or
(ii)  a  closing  agreement  pursuant  to  Section  7121  of  the  Code,  or any
predecessor  provision thereof or any similar provision of state, local, foreign
or other income tax law that relates to the assets or  operations of Arch or any
of its Subsidiaries.

            (iv) Neither Arch nor any of its  Subsidiaries  has made an election
under Section 341(f) of the Code or agreed to have Section 341(f)(2) of the Code
apply to any  disposition  of a subsection (f) asset (as such term is defined in
Section 341(f)(4) of the Code) owned by Arch or any of its Subsidiaries.

            (v) Except as set forth in Arch SEC  Documents  or as  disclosed  on
Schedule 3.1(k)(vi),  neither Arch nor any of its Subsidiaries is a party to, is
bound by or has any obligation under any tax sharing or allocation  agreement or
similar agreement or arrangement.

      For purposes of this  Agreement,  "Taxes"  shall mean all federal,  state,
county, local, foreign or other taxes, charges, fees, levies,  imposts,  duties,
licenses or other assessments,  together with any interest, penalties, additions
to tax or additional amounts imposed by any taxing authority.

      (l) Pension and Benefit Plans; ERISA.

            (i) All "employee  pension plans," as defined in Section 3(2) of the
Employee   Retirement  Income  Security  Act  of  1974,  as  amended  ("ERISA"),
maintained by Arch or any of its Subsidiaries or any trade or business  (whether
or not  incorporated)  which is under common  control,  or which is treated as a
single  employer,  with Arch under Section  414(b),  (c), (m) or (o) of the Code
("Arch ERISA Affiliate") or to which Arch or any of its Subsidiaries or any Arch
ERISA Affiliate  contributed or is obligated to contribute thereunder (the "Arch
Pension Plans") intended to qualify under Section 401 of the Code so qualify and
the trusts  maintained  pursuant thereto are exempt from federal income taxation
under  Section  501 of the Code,  and, to the  knowledge  of Arch as of the date
hereof,  nothing has occurred  with respect to the operation of the Arch Pension
Plans that could reasonably be expected to cause the loss of such  qualification
or exemption or the imposition of any liability,  penalty, or tax under ERISA or
the Code that would have a Material Adverse Effect on Arch.

            (ii) As to the Arch Pension  Plans and as to the  "employee  pension
benefit plans"  maintained or contributed to by Arch, its Subsidiaries or by any
Arch ERISA  Affiliate  within six years prior to the  Effective  Time subject to
Title  IV of  ERISA,  there  has been no event or  condition  which  presents  a
material  risk of  termination,  no notice of intent to terminate has been given
under




                                      13

<PAGE>



Section 4041 of ERISA and no proceeding has been  instituted  under Section 4042
of ERISA to terminate,  such that would result in a material  liability to Arch,
its Subsidiaries, or Arch ERISA Affiliates; no material liability to the Pension
Benefit Guaranty Corporation ("PBGC") has been incurred; no material accumulated
funding deficiency,  whether or not waived, within the meaning of Section 302 of
ERISA or Section 412 of the Code has been incurred;  and the assets of each Arch
Pension  Plan  equal or  exceed  the  actuarial  present  value  of the  benefit
liabilities,  within  the  meaning  of  Section  4041 of ERISA,  under such Arch
Pension  Plan,  based  upon  reasonable  actuarial  assumptions  and  the  asset
valuation principles established by the PBGC.






                                      14

<PAGE>



            (iii) There is no  violation  of ERISA with respect to the filing of
applicable reports,  documents,  and notices regarding all the "employee benefit
plans," as defined in Section 3(3) of the ERISA and all other material  employee
compensation and benefit arrangements or payroll practices,  including,  without
limitation,  severance pay, sick leave,  vacation pay, salary  continuation  for
disability,  consulting or other compensation agreements,  retirement,  deferred
compensation,   bonus,  long-term  incentive,   stock  option,  stock  purchase,
hospitalization,  medical  insurance,  life insurance and  scholarship  programs
maintained  by Arch or any of its  Subsidiaries  or to which  Arch or any of its
Subsidiaries  contributed  or is obligated to  contribute  thereunder  (all such
plans, other than the Arch Pension Plans,  being hereinafter  referred to as the
"Arch  Employee  Benefit  Plans"),  or Arch Pension  Plans with the Secretary of
Labor and the Secretary of the Treasury or the  furnishing of such  documents to
the  participants or  beneficiaries  of the Arch Employee  Benefit Plans or Arch
Pension Plans, which violation would have a Material Adverse Effect on Arch.

            (iv) Except as disclosed on Schedule  3.1(l)(iv),  the Arch Employee
Benefit  Plans and Arch  Pension  Plans have been  maintained,  in all  material
respects,  in  accordance  with  their  terms and with all  provisions  of ERISA
(including rules and regulations  thereunder) and other  applicable  Federal and
state law, all contributions to the Arch Employee Benefit Plans and Arch Pension
Plans have been  timely  made  pursuant  to their  terms,  there is no  material
liability for breaches of fiduciary  duty in  connection  with the Arch Employee
Benefit  Plans and Arch  Pension  Plans,  there have been no material  defaults,
violations,  actions,  suits or  claims  pending  (except  ordinary  claims  for
benefits), or, to the knowledge of Arch, threatened respecting the Arch Employee
Benefit  Plans  and  Arch  Pension  Plans,  and  neither  Arch  nor  any  of its
Subsidiaries  has  engaged in a  material  "prohibited  transaction"  within the
meaning of Section  4975 of the Code or Section 406 of ERISA with respect to the
Arch Employee Benefit Plans and Arch Pension Plans.

            (v) Except as disclosed or referenced on Schedule 3.1(l)(v), neither
the  execution  and  delivery  of this  Agreement  nor the  consummation  of the
transactions  contemplated hereby will (i) result in any payment becoming due to
any  employee or group of  employees  of Arch or any of its  Subsidiaries;  (ii)
increase any benefits  otherwise payable under any Arch Employee Benefit Plan or
Arch  Pension  Plan or the profit  sharing  plan of Arch or (iii)  result in the
acceleration  of the time of payment or vesting of any such benefits.  Except as
disclosed or  referenced  on Schedule  3.1(l)(v)  or in the Arch SEC  Documents,
there are no severance  agreements or employment  agreements between Arch or any
of its Subsidiaries and any employee of Arch or such Subsidiary.

      True and correct  copies of all such  severance  agreements and employment
agreements  have  been  provided  to Pogo.  Except  as set  forth  or  otherwise
referenced on Schedule  3.1(l)(v),  neither Arch nor any of its Subsidiaries has
any consulting  agreement or arrangement with any person involving  compensation
in excess of $10,000, except as are terminable upon one month's notice or less.

            (vi)  No  stock  or  other  security  issued  by  Arch or any of its
Subsidiaries  forms or has  formed a  material  part of the assets of any funded
Arch Employee Benefit Plan or Arch Pension Plan other than the Arch Stock Plan.






                                      15

<PAGE>



            (vii)  Neither Arch nor any of its  Subsidiaries  nor any Arch ERISA
Affiliate  contributes  to, or has an obligation  to contribute  to, and has not
within  six  years  prior  to  the  Effective  Time  contributed  to,  or had an
obligation to contribute to, a multi-employer plan within the meaning of Section
3(37) of ERISA.

            (viii)  Set  forth on  schedule  2.3(b)  is a  complete  list of all
Affiliate Notes, setting forth the amounts owed by such officer.

      (m)   Labor Matters.

            (i) Except as set forth in Schedule 3.1(m)(i) hereto, as of the date
of this  Agreement,  (1) no  employees  of Arch or any of its  Subsidiaries  are
represented by any labor  organization;  (2) no labor  organization  or group of
employees  of Arch or any of its  Subsidiaries  has made a  pending  demand  for
recognition or  certification,  and there are no representation or certification
proceedings or petitions seeking a representation  proceeding  presently pending
or  threatened  in  writing  to be  brought  or filed  with the  National  Labor
Relations Board or any other labor relations  tribunal or authority;  and (3) to
the knowledge of Arch, there are no organizing  activities involving Arch or any
of its Subsidiaries pending with any labor organization or group of employees of
Arch or any of its Subsidiaries.

            (ii) Except as set forth on  Schedule  3.1(m)(ii)  hereto,  Arch and
each of its  Subsidiaries  is in compliance with all laws and orders relating to
the employment of labor,  including all such laws and orders  relating to wages,
hours,  collective bargaining,  discrimination,  civil rights, safety and health
(including the Occupational Safety and Health Act (29 U.S.C. Section 651 et seq.
("OSHA")),  workers'  compensation and the collection and payment of withholding
and/or  Social  Security  Taxes and similar  Taxes,  except where the failure to
comply would not have a Material Adverse Effect on Arch.

      (n)  Intangible  Property.  Arch  and  its  Subsidiaries  possess  or have
adequate rights to use all material trademarks,  trade names,  patents,  service
marks,  brand  marks,  brand names,  computer  programs,  databases,  industrial
designs and copyrights  necessary for the operation of the businesses of each of
Arch and its Subsidiaries (collectively, the "Arch Intangible Property"), except
where the  failure  to possess or have  adequate  rights to use such  properties
would  not have a  Material  Adverse  Effect  on Arch.  Except  as set  forth on
Schedule  3.1(n),  all of the Arch  Intangible  Property is owned by Arch or its
Subsidiaries free and clear of any and all liens, claims or encumbrances, except
those that would not have a Material  Adverse  Effect on Arch,  and neither Arch
nor any  such  Subsidiary  has  forfeited  or  otherwise  relinquished  any Arch
Intangible  Property which forfeiture would result in a Material Adverse Effect.
To the knowledge of Arch, the use of the Arch Intangible Property by Arch or its
Subsidiaries  does not, in any material respect,  conflict with,  infringe upon,
violate or interfere with or constitute an  appropriation  of any right,  title,
interest or goodwill,  including,  without limitation, any intellectual property
right,  trademark,  trade name,  patent,  service mark,  brand mark, brand name,
computer  program,  database,   industrial  design,  copyright  or  any  pending
application  therefor  of any other  person and there have been no claims  made.
Neither Arch nor any of its  Subsidiaries has received any written notice of any
claim or otherwise knows that any of the Arch Intangible  Property is invalid or
conflicts  with the asserted  rights of any other person or has not been used or
enforced or has been failed to be used or enforced in a manner that would result




                                      16

<PAGE>



in the  abandonment,  cancellation  or  unenforceability  of  any  of  the  Arch
Intangible  Property,  except for any such  conflict,  infringement,  violation,
interference, claim, invalidity,  abandonment,  cancellation or unenforceability
that would not have a Material Adverse Effect on Arch.

      (o)   Environmental Matters.

      For purposes of this Agreement:

            (A) "Environmental Law" means any applicable law, rule or regulation
      (including,  without  limitation,  any applicable U.S.  federal,  state or
      local and any applicable  foreign national,  provincial or local law, rule
      or  regulation)  regulating or  prohibiting  Releases into any part of the
      environment,  or pertaining to the protection of natural resources and the
      environment,   including   the   Comprehensive   Environmental   Response,
      Compensation,  and Liability  Act  ("CERCLA")  (42 U.S.C.  Section 9601 et
      seq.), the Hazardous Materials  Transportation Act (49 U.S.C. Section 1801
      et seq.), the Resource  Conservation  and Recovery Act (42 U.S.C.  Section
      6901 et seq.),  the Clean Water Act (33 U.S.C.  Section 1251 et seq.), the
      Clean  Air Act (33  U.S.C.  Section  7401 et seq.),  the Toxic  Substances
      Control Act (15 U.S.C. Section 7401 et seq.), and the Federal Insecticide,
      Fungicide,  and  Rodenticide Act (7 U.S.C.  Section 136 et seq.),  and the
      regulations promulgated pursuant thereto, and any such applicable state or
      local statutes, and the regulations  promulgated pursuant thereto, as such
      laws have been and may be  amended or  supplemented  through  the  Closing
      Date.

            (B)  "Hazardous  Material"  means any  substance,  material or waste
      which is  regulated  pursuant  to any  Environmental  Law by any public or
      governmental  authority in the jurisdictions in which the applicable party
      or its  Subsidiaries  conducts  business,  or the United States or Canada,
      including,  without limitation, any material or substance which is defined
      as a  "hazardous  waste,"  "hazardous  material,"  "hazardous  substance,"
      "extremely    hazardous   waste"   or   "restricted    hazardous   waste,"
      "contaminant,"  "toxic waste" or "toxic  substance" under any provision of
      Environmental Law;

            (C) "Release" means any release, spill, effluent, emission, leaking,
      pumping, injection, deposit, disposal,  discharge,  dispersal, leaching or
      migration into the environment; and

            (D)  "Remedial  Action"  means  all  actions,   including,   without
      limitation, any capital expenditures, required by a Governmental Entity or
      required under any Environmental  Law, to (I) clean up, remove,  treat, or
      in any other way  ameliorate or address any  Hazardous  Materials or other
      substance  in the  environment;  (II)  prevent  the  Release  or threat of
      Release,  or minimize the further Release of any Hazardous  Material so it
      does not endanger or threaten to endanger the public  health or welfare of
      the indoor or outdoor environment;  (III) perform pre-remedial studies and
      investigations or post-remedial monitoring and care pertaining or relating
      to a Release;  or (IV) bring the applicable party into compliance with any
      Environmental Law.






                                      17

<PAGE>



            (i) Except as disclosed on Schedule  3.1(o),  the operations of Arch
and its  Subsidiaries  have  been  and,  as of the  Closing  Date,  will be,  in
compliance with all  Environmental  Laws,  except where the failure to so comply
would not have a Material Adverse Effect on Arch or APL;

            (ii)  Except  as  disclosed  on  Schedule   3.1(o),   Arch  and  its
Subsidiaries  have  obtained  and will,  as of the Closing  Date,  maintain  all
permits  required  under  applicable   Environmental   Laws  for  the  continued
operations of their respective businesses, except such permits the lack of which
would have a Material Adverse Effect on Arch or APL;

            (iii) Except as disclosed on Schedule 3.1(o),  as of the date hereof
Arch and its Subsidiaries  are not subject to any outstanding  written orders or
material  contracts with any Governmental  Entity or other person respecting (A)
Environmental Laws, (B) Remedial Action or (C) any Release or threatened Release
of a Hazardous  Material except for such orders or contracts that would not have
a Material Adverse Effect on Arch or APL;

            (iv)  Except  as  disclosed  on  Schedule   3.1(o),   Arch  and  its
Subsidiaries  have not received any written  communication in the last two years
alleging,  with respect to any such party,  the violation of or liability  under
any Environmental Law, which violation or liability would reasonably be expected
to have a Material Adverse Effect on Arch or APL;

            (v) Except as disclosed on Schedule 3.1(o), to the knowledge of Arch
or APL, neither Arch nor any of its Subsidiaries has any contingent liability in
connection  with the  Release of any  Hazardous  Material  into the  environment
(whether on-site or off-site) that would have a Material Adverse Effect on Arch;

            (vi) Except as disclosed on Schedule 3.1(o),  the operations of Arch
or its Subsidiaries involving the generation, transportation, treatment, storage
or disposal of hazardous  waste, as defined and regulated under 40 C.F.R.  Parts
260-270  (in effect as of the date of this  Agreement)  or any  foreign or state
equivalent,  are in compliance with applicable  Environmental Laws, except where
the  failure to so comply  would not  reasonably  be expected to have a Material
Adverse Effect on Arch; and

            (vii) Except as disclosed on Schedule  3.1(o),  to the  knowledge of
Arch as of the date  hereof,  there is not now on or in any  property of Arch or
its  Subsidiaries  any of the following:  (A) any  underground  storage tanks or
surface impoundments,  (B) any friable asbestos-containing materials, or (C) any
polychlorinated  biphenyls, any of which ((A), (B), or (C) preceding) would have
a Material Adverse Effect on Arch.

      (p)  Maps,   Geological,   Geophysical  Libraries  and  other  Proprietary
Information.  Except as set forth on Schedule 3.1(p), to Arch's  knowledge,  (i)
either  Arch  or its  Subsidiaries  own,  or  have a right  to use  without  any
limitations  or  restrictions  adversely  affecting  the use of the  same in the
ordinary  conduct  of  their  business,   subject  to  all  applicable   license
agreements,   laws,  rules  and  regulations,   including  without   limitation,
directives,  orders or  similar  actions of the  province  of  Alberta's  Energy
Resources Conservation Board, all technology, know-how, processes, maps, seismic
records, well logs, core samples, interpretations and programs, and all seismic,
geological,




                                      18

<PAGE>



engineering  and  geophysical  information  and libraries and other  proprietary
information now used in the conduct of their business (collectively, "Evaluation
Data"),  and (ii) the  consummation  of the  transactions  contemplated  by this
Agreement will not alter or impair any such rights or breach any agreements with
third party vendors or require  payments of additional  sums thereto.  Except as
set forth on  Schedule  3.1(p),  no  claims  have been  asserted  by any  person
challenging  Arch's or its  Subsidiaries'  right to use or obtain  access to any
such  Evaluation  Data and no person has overtly  challenged or  questioned  the
right of Arch or any of its Subsidiaries to copy,  modify, use or distribute the
same  within  the  terms  governing  Arch's  or its  Subsidiaries'  use of  such
Evaluation Date, nor to Arch's knowledge,  is there any reasonable basis for any
such claim,  challenge or question.  Except as set forth on Schedule 3.1(p), the
manner in which  Arch or its  Subsidiaries  have  actually  used or copied  such
Evaluation Data does not infringe on the rights of any persons.

      (q) Vote Required.  The affirmative  vote of the holders of (i) a majority
of the  outstanding  shares of Arch Common  Stock,  and (ii)  two-thirds  of the
shares of the outstanding  Convertible Preferred Stock are the only votes of the
holders of any class or series of Arch capital  stock  necessary to approve this
Agreement and the transactions contemplated hereby.

      (r)  Beneficial  Ownership  of Pogo Common  Stock.  As of the date hereof,
assuming the accuracy of the representation set forth in Section 3.2(b), neither
Arch nor its  Subsidiaries  "beneficially  owns" (as defined in Rule 13d-3 under
the Exchange Act) any Pogo Common Stock.

      (s) Insurance.  Arch has delivered to Pogo an insurance schedule of Arch's
and each of its  Subsidiaries'  directors'  and officers'  liability  insurance,
primary and excess casualty  insurance  policies,  providing coverage for bodily
injury and property damage to third parties,  including  products  liability and
completed operations coverage,  and worker's  compensation,  in effect as of the
date hereof.  Arch  maintains  insurance  coverage  reasonably  adequate for the
operation  of the  business of Arch and each of its  Subsidiaries  (taking  into
account  the cost and  availability  of such  insurance),  and the  transactions
contemplated hereby will not materially adversely affect such coverage.

      (t) Brokers. No broker,  investment banker, or other person is entitled to
any broker's, finder's or other similar fee or commission in connection with the
transactions  contemplated by this Agreement based upon  arrangements made by or
on behalf of Arch.

      (u)  Accounting  Matters.  Arch has  previously  (i) requested its outside
accountants  to  disclose  to  Pogo  any  actions  taken  by  Arch or any of its
affiliates,  and (ii) accurately  answered all written  questions posed by Pogo,
that in either such case are relevant to the  determination  of the treatment of
the business  combination to be effected by the Merger as a pooling of interests
for accounting purposes.

      (v)  Title  to Oil and Gas  Properties;  Performance  of  Obligations;  no
Defaults or  Violations;  Material Oil and Gas  Contracts.  For purposes of this
Agreement,  the term  "Oil and Gas  Properties"  shall  mean all of the  royalty
interests,  oil and gas leases or oil, gas and mineral  leases owned by Arch and
its Subsidiaries and described or referred to in Schedule 3.1(v),  the leasehold
estates  created  thereby  and any other real  property  interest  described  in
Schedule  3.1(v),  together  with  all the  property  and  rights  incident  and
appurtenant thereto, including without limitation the




                                      19

<PAGE>



undivided  interests of either Arch or APL (as specified on Schedule  3.1(v)) in
and to such leases and the lands covered  thereby and the wells or units located
thereon or applicable thereto, all as set forth in Schedule 3.1(v). Neither Arch
nor APL warrant title to the Oil and Gas Properties, but Arch does represent and
warrant  that (i) they have done no act or thing  whereby any of the Oil and Gas
Properties may be canceled or terminated  and, to Arch's and APL's  knowledge on
the basis of (A) its actual  knowledge,  (B) with  respect to  properties  which
Arch, APL or TDC operate,  what a prudent joint operator should have known,  and
(C) with respect to properties that are not operated by Arch, APL or TDC, what a
prudent  person in the conduct of his business  should have known ((A),  (B) and
(C) are  hereinafter  referred to "Oil & Gas Knowledge") no other party has done
any such thing;  (ii) except as disclosed on Schedule 3.1(v),  and except as may
be provided in any oil and gas contract  entered  into in the  ordinary  course,
neither Arch nor APL have created any lien or encumbrance upon or against any of
the Oil and Gas Properties;  (iii) except as disclosed on Schedule 3.1(v),  none
of the Oil and Gas  Properties  are subject to  reduction or  conversion  (A) by
reference to payout of any well or (B) otherwise pursuant to a right created by,
through or under either Arch or APL; (iv) to the Oil & Gas Knowledge of Arch, or
APL,  as  applicable,  may  enter  into and  upon,  and hold and enjoy the lands
included in or comprising the Oil and Gas Properties for the respective terms of
the oil and gas leases or oil, gas and mineral leases including in or comprising
the Oil and Gas  Properties  (collectively,  the  "Leases")  and all renewals or
extensions  thereof without any interruption of or by the vendors to either Arch
or APL or any other person  claiming by, through or under such vendors;  (v) all
rentals, royalties and all ad valorem, income, property,  production,  severance
and similar taxes and assessments on or measured by the ownership of the Oil and
Gas  Properties or the production of petroleum  substances  from the Oil and Gas
Properties  or the receipt of proceeds  therefrom  payable  prior to the Closing
Date have been duly and properly paid; provided that with respect to Oil and Gas
Properties not operated by either Arch or APL, Arch or APL, as applicable, makes
the  representation  set out in this  clause (v) only on the basis of Arch's and
APL's  respective  Oil & Gas  Knowledge;  (vi) to  Arch's  and  APL's  Oil & Gas
Knowledge,  each have  complied  with,  performed,  observed and  satisfied  all
material terms, conditions,  obligations,  and liabilities which have heretofore
arisen  and  were  the  obligations  of  either  Arch  or APL  under  any of the
provisions of any contract or agreement  (including any Lease) affecting any Oil
and  Gas  Property  or any  statute,  rule,  regulation,  permit,  order,  writ,
injunction,  or decree of any  governmental  agency or court relating to any Oil
and Gas  Property,  and,  to Arch's  and APL's  Oil & Gas  Knowledge,  where the
performance,  observance,  or satisfaction of any such material term, condition,
obligation  or liability is or was the  responsibility  of another  party,  such
other party has so performed,  observed and  satisfied  the same;  (vii) neither
Arch  nor APL is in  material  default,  nor  does  either  Arch or APL have any
knowledge  of, nor has Arch or APL been  informed  of, any  material  default or
received notice of any material  default by any other party,  under any contract
relating  to an Oil and Gas  Property or  agreement  (including  any Lease),  or
otherwise  relating to any Oil and Gas  Property;  provided that with respect to
any such contract or agreement relating to any Oil and Gas Property not operated
by either Arch or APL, Arch or APL, as applicable,  makes the representation set
out in this clause  (vii) only to Arch's and APL's Oil & Gas  Knowledge;  (viii)
neither Arch nor APL has received,  nor to the knowledge of Arch and APL has any
other party received, any notice of the occurrence of a material violation,  nor
is Arch or APL aware that any material  violation is occurring or has  occurred,
in respect of operations  relating to the Oil and Gas Properties;  provided that
in respect of  operations  relating to Oil and Gas  Properties  not  operated by
either Arch or APL, Arch makes the representations set out in this clause (viii)
only to Arch's and APL's Oil & Gas Knowledge; and (ix) Schedule 3.1(v) lists all
joint ventures, partnerships, or




                                      20

<PAGE>



contracts for the sale or processing of gas pursuant to which either Arch or APL
has mandatory capital  expenditure  obligations in excess of $250,000  annually;
and (x) Schedule 3.1(v) lists all executory  contracts  pursuant to which either
Arch or APL have agreed to purchase, sell or exchange Oil and Gas Properties for
consideration or having a value in excess of $50,000.

      (w) Title to Other Properties.  Arch or its  Subsidiaries,  as applicable,
have  defensible  title  to,  or a valid  right to use and  enjoy,  all of their
properties and assets,  real and personal,  tangible and intangible  (other than
the Oil and Gas Properties,  which are the subject of Section 3.1(v) above) used
in connection with the operation of the Oil and Gas Properties and the marketing
of  production  therefrom;  provided  that with respect to such  properties  and
assets which are used in the operation of Oil and Gas Properties not operated by
either Arch or APL,  Arch makes the foregoing  representation  only as to Arch's
and APL's Oil & Gas Knowledge.  Except as set forth on Schedule  3.1(w),  all of
such properties are free of any mortgage,  pledge, lien, charge,  encumbrance or
other  adverse  claim,  created  or  arising,  through  or  under  Arch  or such
Subsidiary and to Arch's and APL's Oil & Gas Knowledge,  all of such  properties
are free of any other mortgage,  pledge,  lien, charge,  encumbrance or recorded
adverse claim howsoever created or arising.

      (x) Personalty,  Equipment and Fixtures Equipment.  All wells,  platforms,
fixtures,  facilities,  pipelines, gas plants,  vehicles,  personal property and
equipment owned or leased by Arch or its Subsidiaries and used in its operations
or attributed value on Arch's consolidated balance sheet are (i) in good working
order,  ordinary  wear  and  tear  excepted,  and  Arch  or its  Subsidiary  has
maintained the same in accordance  with sound  industry or oil field  practices,
and   to   Arch's    knowledge,    either    Arch's    or   its    Subsidiaries'
predecessors-in-interest  have so maintained the same,  (ii) adequate,  together
with all  related  assets,  to comply  with the volume and  pipeline  or shipper
quality  requirements  of  all  applicable   contracts,   including  gas  sales,
processing  and  transportation  contracts  and (iii) meet and  comply  with all
applicable laws, rules and regulations of any Governmental Entity, excluding all
Environmental  Laws which is the subject of Section  3.1(o);  provided that with
respect to property and equipment which are used in the operation of Oil and Gas
Properties  not  operated  by  either  Arch or APL,  Arch  makes  the  foregoing
representations only on the basis of Arch's and APL's Oil & Gas Knowledge.

      (y) Wells; Leases;  Operations Generally.  Except as disclosed on Schedule
3.1(y), since the date that either Arch or APL have acquired each of the Oil and
Gas Properties,  the production of oil and gas therefrom has not been materially
in excess of the allowable  production  allocated to each well  thereon,  and to
either Arch or APL's  knowledge,  Arch's or APL's  predecessors-in-interest,  as
applicable,  have  not  produced  any  such  well  in  excess  of the  allowable
production  allocated thereto;  provided that with respect to wells not operated
by  either  Arch  or APL  or  their  predecessors-in-interest,  Arch  makes  the
foregoing representation only as to Arch's and APL's Oil & Gas Knowledge. Except
as disclosed on Schedule 3.1(y),  (i) there are no provisions  applicable to any
of the Leases or other  contracts  to which  either  Arch or APL is a party that
increase the royalty share of the lessor thereunder;  (ii) following  production
sufficient  to hold the Leases  without  payment of delay  rentals,  none of the
Leases are fixed-term Leases;  and (iii) to Arch's or APL's executive  officer's
actual  knowledge  the terms of the  Leases  are in  accordance  with  generally
accepted  standards in the  jurisdiction  in which the lands covered thereby are
located.






                                      21

<PAGE>



      (z)  Marketing;  Take or Pay  Payments.  Except as  disclosed  on Schedule
3.1(z),  no amounts of  hydrocarbons  produced from any Oil and Gas Property are
subject to a sales or  transportation  (excluding  gathering  systems)  contract
(except for contracts  terminable  without  penalty by either Arch or APL on not
more than 30 days  notice),  and except as may be  contained  in any contract or
other  instrument  described  on Schedule  3.1(z),  no person has any call upon,
option to purchase or similar rights under any agreement with respect to the Oil
and Gas Properties or to the production  therefrom.  Neither Arch nor APL has in
any respect collected,  nor will either Arch or APL in any respect collect,  any
proceeds from the sale of hydrocarbons  produced from the Oil and Gas Properties
that are subject to refund,  except as  disclosed on Schedule  3.1(z).  Proceeds
from the sale of oil,  condensate  and gas from the Oil and Gas  Properties  are
being  received in all respects by either Arch or APL in a timely manner and are
not being held in  suspense  for any  reason,  except as  disclosed  on Schedule
3.1(z).  Neither  Arch nor APL has been nor will either Arch or APL be obligated
by virtue of any  prepayment  made under any  production  sales  contract or any
other  contract  containing a "Take or Pay" clause,  or under any gas balancing,
deferred production or similar arrangement to deliver oil, gas or other minerals
produced  from or allocated to any of the Oil and Gas  Properties at some future
time without receiving full payment therefor at the time of delivery,  except as
disclosed on Schedule 3.1(z).  Except as disclosed on Schedule 3.1(z), there are
no material  gas  imbalances  as between  either Arch or APL and any third party
with respect to  operations  relating to the Oil and Gas  Properties.  Except as
disclosed on Schedule  3.1(z),  to the Oil & Gas Knowledge of Arch and APL, they
have each  followed  customary  practices  in the oil and gas  industry and have
filed,  or caused to be  filed,  with the  appropriate  provincial  and  federal
agencies  all  necessary   rate  and   collection   filings  and  all  necessary
applications  for well  determinations  under  applicable law, and the rules and
regulations  of any  applicable  Governmental  Entity  thereunder  and each such
application  has been approved by or is pending  before the  appropriate  state,
provincial or federal  agency.  Except as disclosed on Schedule  3.1(z),  no gas
sold by Arch or APL from the Oil and Gas  Properties is  price-restricted  under
any law, rule or regulation.

      3.2  Representations  and Warranties of Pogo and Sub. Pogo and Sub jointly
and severally represent and warrant to Arch as follows:

      (a)  Organization,  Standing  and  Power.  Each of  Pogo,  Sub and  Pogo's
Significant  Subsidiaries  is  a  corporation,   limited  liability  company  or
partnership duly organized, validly existing and in good standing under the laws
of its state or jurisdiction of incorporation or organization, has all requisite
power and authority to own, lease and operate its properties and to carry on its
business as now being  conducted,  and is duly qualified and in good standing to
do business in each jurisdiction in which the business it is conducting,  or the
operation,  ownership  or leasing of its  properties,  makes such  qualification
necessary,  other  than in such  jurisdictions  where the  failure so to qualify
would not have a Material  Adverse Effect on Pogo.  Pogo and Sub have heretofore
delivered to Arch complete and correct copies of their  respective  Certificates
of  Incorporation   and  Bylaws.  As  used  in  this  Agreement  a  "Significant
Subsidiary"  means any  Subsidiary  of Pogo that would  constitute a Significant
Subsidiary  of such party within the meaning of Rule 1-02 of  Regulation  S-X of
the Securities and Exchange Commission (the "SEC").






                                      22

<PAGE>



      (b) Capital Structure. As of the date hereof, the authorized capital stock
of Pogo consists of 100,000,000 shares of Pogo Common Stock and 1,000,000 shares
of  preferred  stock,  par value $1.00 per share,  of Pogo (the "Pogo  Preferred
Stock").  At the close of business on March 31,  1998 (i)  37,559,370  shares of
Pogo Common Stock were issued and outstanding; (ii) 15,575 shares of Pogo Common
Stock  were held by Pogo,  which are  treated  for  purposes  of clause  (i) and
financial reporting purposes as having been effectively retired; (iii) no shares
of Pogo Preferred  Stock are issued and  outstanding;  and (iv)  $115,000,000 of
Voting Debt was issued or  outstanding  with  respect to Pogo.  All  outstanding
shares of Pogo  capital  stock  are,  and the shares of Pogo  Common  Stock when
issued in accordance  with this  Agreement,  and upon exercise of the Arch Stock
Options (as defined in Section 5.8) to be assumed  pursuant to the Merger,  will
be,  validly  issued,  fully  paid and  non-assessable  and were not  issued  in
violation of any preemptive rights.  Except as set forth on Schedule 3.2(b), all
outstanding shares of capital stock of the Significant  Subsidiaries of Pogo are
owned by Pogo,  a direct or indirect  wholly  owned  Subsidiary  of Pogo,  or by
officers of Pogo as required by local law, free and clear of all liens, charges,
encumbrances,  claims  and  options of any  nature.  Except as set forth in this
Section  3.2(b) or on Schedule  3.2(b) or as described in the Pogo SEC Documents
and except for  changes  since  March 31, 1998  resulting  from the  exercise of
employee  stock  options  granted  pursuant  to, or from  issuances  under plans
described in the Pogo SEC Documents (as defined herein) (collectively, the "Pogo
Equity Plans"), or as contemplated by this Agreement, there are outstanding: (i)
no shares of capital stock, Voting Debt or other voting securities of Pogo; (ii)
no securities of Pogo or any Subsidiary of Pogo convertible into or exchangeable
for shares of capital stock,  Voting Debt or other voting  securities of Pogo or
any Subsidiary of Pogo; and (iii) no options, warrants, calls, rights (including
preemptive rights), commitments or agreements to which Pogo or any Subsidiary of
Pogo is a party or by which  it is  bound  in any  case  obligating  Pogo or any
Significant  Subsidiary of Pogo to issue,  deliver,  sell,  purchase,  redeem or
acquire,  or  cause  to be  issued,  delivered,  sold,  purchased,  redeemed  or
acquired,  additional shares of capital stock or any Voting Debt or other voting
securities of Pogo or of any  Significant  Subsidiary of Pogo or obligating Pogo
or any  Significant  Subsidiary of Pogo to grant,  extend or enter into any such
option, warrant, call, right,  commitment or agreement.  There are not as of the
date  hereof  and  there  will  not be at the  Effective  Time  any  stockholder
agreements, voting trusts or other agreements or understandings to which Pogo is
a party or by which it is bound  relating  to the  voting  of any  shares of the
capital stock of Pogo. As of the date hereof,  the  authorized  capital stock of
Sub consists of 1,000 shares of common stock,  par value $0.01 per share,  1,000
shares of which are validly issued,  fully paid and non-assessable and are owned
by Pogo.

      (c)   Authority; No Violations, Consents and Approvals.

            (i)  Each of Pogo and Sub have all  requisite  corporate  power  and
authority  to enter  into this  Agreement  and to  consummate  the  transactions
contemplated  hereby.  The  execution  and  delivery of this  Agreement  and the
consummation of the transactions  contemplated hereby, including but not limited
to the issuance of the Pogo Common Stock pursuant to the Merger,  have been duly
authorized by all necessary  corporate  action on the part of Pogo and Sub. This
Agreement  has been duly  executed and  delivered by Pogo and Sub and,  assuming
this Agreement constitutes the valid and binding obligation of Arch, constitutes
a valid and binding obligation of each of Pogo and Sub enforceable in accordance
with its  terms,  subject,  as to  enforceability,  to  bankruptcy,  insolvency,
reorganization and other laws of general applicability  relating to or affecting
creditors' rights and to general principles of equity.




                                      23

<PAGE>




            (ii) The execution and delivery of this  Agreement does not, and the
consummation  of the  transactions  contemplated  hereby and compliance with the
provisions  hereof will not,  conflict  with,  or result in any violation of, or
default (with or without  notice or lapse of time, or both) under,  or give rise
to a right of termination,  cancellation or acceleration of any obligation or to
the loss of a material benefit under, or give rise to a right of purchase under,
result in the creation of any lien,  security  interest,  charge or  encumbrance
upon any of the properties or assets of Pogo or any of its  Subsidiaries  under,
or otherwise result in a detriment to Pogo or any of its Subsidiaries under, any
provision  of (A) the  Certificate  of  Incorporation  or  Bylaws of Pogo or any
provision of the comparable  charter or  organizational  documents of any of its
Subsidiaries, (B) any loan or credit agreement, note, bond, mortgage, indenture,
lease or other agreement (including,  without limitation, any pre-emptive rights
or rights of first refusal with respect to oil and gas  interests),  instrument,
permit,  concession,  franchise  or  license  applicable  to  Pogo or any of its
Subsidiaries,  (C) any  joint  operating  agreement  or joint  venture  or other
ownership arrangement or (D) assuming the consents, approvals, authorizations or
permits and filings or notifications referred to in Section 3.2(c)(iii) are duly
and  timely  obtained  or made,  any  judgment,  order,  decree,  statute,  law,
ordinance,  rule or regulation  applicable to Pogo or any of its Subsidiaries or
any of their respective  properties or assets, other than, in the case of clause
(B),  (C) or (D),  any such  conflicts,  violations,  defaults,  rights,  liens,
security interests, charges, encumbrances or detriments that, individually or in
the  aggregate,  would not have a Material  Adverse  Effect on Pogo,  materially
impair the ability of Pogo to perform its obligations hereunder or thereunder or
prevent  the  consummation  of any of the  transactions  contemplated  hereby or
thereby.

            (iii)  No  consent,   approval,   order  or  authorization   of,  or
registration, declaration or filing with, or permit from any Governmental Entity
is required by or with respect to Pogo or any of its  Subsidiaries in connection
with  the  execution  and  delivery  of this  Agreement  by Pogo  and Sub or the
consummation  by Pogo and Sub of the  transactions  contemplated  hereby,  as to
which the  failure to obtain or make would  have a  Material  Adverse  Effect on
Pogo,  except for:  (A) the filing of a pre-merger  notification  report by Pogo
under the HSR Act and the expiration or  termination  of the applicable  waiting
period with respect thereto; (B) the filing with the SEC of the Proxy Statement,
the S-4,  such reports  under  Section  13(a) of the Exchange Act and such other
compliance  with the  Securities  Act and the  Exchange  Act and the  rules  and
regulations  thereunder as may be required in connection with this Agreement and
the  transactions  contemplated  hereby,  and the obtaining from the SEC of such
orders as may be so required;  (C) the filing of the  Certificate of Merger with
the Secretary of State of the State of Delaware;  (D) filings with, and approval
of,  the  NYSE;  (E)  such  filings  and  approvals  as may be  required  by any
applicable state securities,  "blue sky" or takeover laws or environmental laws;
and (F) such filings and approvals as may be required by any foreign  pre-merger
notification, securities, corporate or other law, rule or regulation.

      (d) SEC  Documents.  Pogo has made  available  to Arch a true and complete
copy of each report,  schedule,  registration  statement  and  definitive  proxy
statement  filed by Pogo with the SEC since  December  31, 1997 and prior to the
date of this Agreement (the "Pogo SEC  Documents"),  which are all the documents
(other than  preliminary  material)  that Pogo was required to file with the SEC
during  such  period.  As of their  respective  dates,  the  Pogo SEC  Documents
complied in all material respects with the requirements of the Securities Act or
the Exchange Act, as the case may be, and the rules and  regulations  of the SEC
thereunder  applicable  to such  Pogo  SEC  Documents,  and none of the Pogo SEC
Documents contained any untrue statement of a material fact or omitted




                                      24

<PAGE>



to state a material fact required to be stated  therein or necessary to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading.  The  financial  statements  of Pogo  included  in the Pogo SEC
Documents  complied as to form in all material respects with the published rules
and  regulations  of the SEC with respect  thereto,  were prepared in accordance
with GAAP applied on a consistent  basis during the periods  involved (except as
may  be  indicated  in the  notes  thereto  or,  in the  case  of the  unaudited
statements,  as permitted by Rule 10-01 of Regulation S-X of the SEC) and fairly
present in accordance with applicable requirements of GAAP (subject, in the case
of  the  unaudited  statements,  to  normal  year-end  adjustments,   any  other
adjustments  described therein,  and the fact that certain information and notes
have been condensed or omitted in accordance with the Exchange Act and the rules
and regulations  promulgated  thereunder) the consolidated financial position of
Pogo and its  consolidated  Subsidiaries  as of their  respective  dates and the
consolidated  results of operations and the consolidated  cash flows of Pogo and
its consolidated Subsidiaries for the periods presented therein.

      (e)  Information  Supplied.  None  of the  information  supplied  or to be
supplied by Pogo or Sub for inclusion or  incorporation  by reference in the S-4
will, at the time the S-4 becomes  effective  under the Securities Act or at the
Effective Time, contain any untrue statement of a material fact or omit to state
any  material  fact  required  to be stated  therein  or  necessary  to make the
statements therein not misleading, and none of the information supplied or to be
supplied by Pogo or Pogo Sub and  included or  incorporated  by reference in the
Proxy  Statement will, at the date mailed to stockholders of Arch or at the time
of the meeting of such  stockholders to be held in connection with the Merger or
at the Effective Time,  contain any untrue  statement of a material fact or omit
to state any material fact  required to be stated  therein or necessary in order
to make the statements  therein,  in light of the circumstances under which they
are made, not misleading.

      (f)  Absence of Certain  Changes or  Events.  Except as  disclosed  in, or
reflected in the financial  statements included in, the Pogo SEC Documents or on
Schedule 3.2(f), or except as contemplated by this Agreement, since December 31,
1997, there has not been: (i) any  declaration,  setting aside or payment of any
dividend or other distribution (whether in cash, stock or property) with respect
to any of Pogo's capital stock,  except for regular quarterly cash dividends not
in excess of $.03 per share on Pogo  Common  Stock (or a pro rata amount for any
dividend  less than a full quarter) with usual record and payment dates for such
dividends;  (ii) any  amendment of any material term of any  outstanding  equity
security of Pogo or any Significant Subsidiary; (iii) any repurchase, redemption
or other  acquisition  by Pogo or any  Subsidiary of any  outstanding  shares of
capital stock or other equity  securities of, or other  ownership  interests in,
Pogo or any Subsidiary,  except as contemplated by any Pogo benefit plans;  (iv)
any material  change in any method of accounting  or accounting  practice or any
tax  method,  practice or  election  by Pogo or any  Subsidiary;  (v) options to
purchase  Pogo  Common  Stock  granted  under  any  stock  option  plan or other
agreement at a price less than the fair market value of the Pogo Common Stock on
the date of grant; or (vi) any other transaction,  commitment,  dispute or other
event or condition  (financial or otherwise) of any character (whether or not in
the ordinary course of business) that has had a Material Adverse Effect on Pogo.

      (g) No Vote  Required.  No vote of the  holders  of any class or series of
Pogo  capital  stock or Voting Debt of Pogo is necessary to approve the issuance
of  Pogo  Common  Stock  pursuant  to  this   Agreement  and  the   transactions
contemplated hereby.





                                      25

<PAGE>



      (h)  Beneficial  Ownership  of Arch Common  Stock.  As of the date hereof,
assuming the accuracy of the representation set forth in Section 3.1(b), neither
Pogo nor its  Subsidiaries  "beneficially  owns" (as defined in Rule 13d-3 under
the Exchange Act) any of the outstanding Arch Common Stock.

      (i) Brokers.  No broker,  investment banker or other person is entitled to
any broker's, finder's or other similar fee or commission in connection with the
transactions  contemplated by this Agreement based upon  arrangements made by or
on behalf of Pogo.

      (j)  Interim  Operations  of Sub.  Sub was  formed by Pogo  solely for the
purpose of engaging in the transactions  contemplated  hereby, has engaged in no
other business or activities,  has incurred no other obligations or liabilities,
has no other  assets  and has  conducted  its  operations  only as  contemplated
hereby. All of the outstanding capital stock of Sub is owned directly by Pogo.

      (k) No Undisclosed Material  Liabilities.  Except as disclosed in the Pogo
SEC Documents or on Schedule 3.2(k), as of the date hereof, neither Pogo nor any
of  its  Significant  Subsidiaries  has  incurred  any  liability  of  any  kind
whatsoever, whether accrued, contingent,  absolute, determined,  determinable or
otherwise,  that  would  have a  Material  Adverse  Effect  on Pogo  other  than
liabilities under this Agreement.

      (l) No Default. Neither Pogo nor any of its Significant Subsidiaries is in
default or violation (and no event has occurred which,  with notice or the lapse
of time or both, would constitute a default or violation) of any term, condition
or provision  of (i) their  respective  charter,  organizational  documents  and
by-laws,  (ii) except as disclosed in Schedule 3.2(l), any note, bond, mortgage,
indenture, license, agreement or other instrument or obligation to which Pogo or
any of its  Significant  Subsidiaries  is now a party or by which Pogo or any of
its Significant Subsidiaries or any of their respective properties or assets may
be bound  or  (iii)  any  order,  writ,  injunction,  decree,  statute,  rule or
regulation applicable to Pogo or any of its Significant Subsidiaries,  except in
the case of (ii) and (iii) for  defaults or  violations  which in the  aggregate
would not have a Material Adverse Effect on Pogo.

      (m) Compliance  with Applicable  Laws.  Pogo holds all permits,  licenses,
variances,  exemptions,  orders,  franchises  and approvals of all  Governmental
Entities  necessary for the lawful conduct of their  respective  businesses (the
"Pogo  Permits"),  except where the failure so to hold would not have a Material
Adverse  Effect  on  Pogo.  Pogo is in  compliance  with  the  terms of the Pogo
Permits, except where the failure so to comply would not have a Material Adverse
Effect on Pogo. Except as disclosed in the Pogo SEC Documents or as set forth on
the disclosure  schedules  hereto,  the  businesses of Pogo and its  Significant
Subsidiaries  are not being  conducted  in  violation  of any law,  ordinance or
regulation of any  Governmental  Entity,  except for possible  violations  which
would  not have a  Material  Adverse  Effect  on Pogo.  Except  as set  forth on
Schedule 3.2(m), as of the date of this Agreement, no investigation or review by
any  Governmental  Entity  with  respect  to  Pogo  or any  of  its  Significant
Subsidiaries  is pending  or, to the  knowledge  of Pogo as of the date  hereof,
threatened,  other  than those the  outcome  of which  would not have a Material
Adverse Effect on Pogo.






                                      26

<PAGE>



      (n)  Litigation.  Except  as  disclosed  in the Pogo SEC  Documents  or on
Schedule 3.2(n) hereto,  there is no suit, action or proceeding pending,  or, to
the knowledge of Pogo,  threatened  against or affecting Pogo or its Significant
Subsidiaries  ("Pogo  Litigation"),  and Pogo has no knowledge of any facts that
are likely to give rise to any Pogo Litigation,  that (in any case) would have a
Material Adverse Effect on Pogo, nor is there any judgment,  decree, injunction,
rule or order of any Governmental Entity or arbitrator  outstanding against Pogo
or its  Significant  Subsidiaries  ("Pogo  Order")  that  would  have a Material
Adverse  Effect on Pogo or  materially  impair the ability of Pogo to consummate
the transactions contemplated by this Agreement.


                                  ARTICLE IV

               COVENANTS RELATING TO CONDUCT OF BUSINESS OF ARCH

      4.1 Conduct of Business by Arch Pending the Merger. During the period from
the date of this Agreement and continuing  until the Effective Time, Arch agrees
as to itself and its  Subsidiaries  that  (except as expressly  contemplated  or
permitted by this Agreement,  or to the extent that Pogo shall otherwise consent
in writing):

            (a) Ordinary Course.  Each of Arch and its Subsidiaries  shall carry
      on  its  businesses  in  the  usual,   regular  and  ordinary   course  in
      substantially  the same manner as  heretofore  conducted and shall use all
      reasonable efforts to preserve intact its present business  organizations,
      keep  available the services of its current  officers and  employees,  and
      endeavor to preserve  its  relationships  with  customers,  suppliers  and
      others having business dealings with it.

            (b)  Dividends;  Changes  in Stock.  Arch shall not and it shall not
      permit any of its  Subsidiaries to: (i) declare or pay any dividends on or
      make  other  distributions  in  respect  of any of its  capital  stock  or
      partnership interests, except for the declaration and payment of dividends
      from a Subsidiary of Arch to Arch or another Subsidiary of Arch and except
      for cash dividends paid to holders of the  Convertible  Preferred Stock or
      distributions  paid in the ordinary course of business and consistent with
      past practices,  on or with respect to the membership interests of Saginaw
      Pipeline  Company,  L.C. and  Industrial  Natural Gas,  L.C.;  (ii) split,
      combine or  reclassify  any of its capital  stock or issue or authorize or
      propose the issuance of any other  securities in respect of, in lieu of or
      in   substitution   for  shares  of  Arch  capital  stock  other  than  as
      contemplated by this Agreement;  or (iii) repurchase,  redeem or otherwise
      acquire,  or  permit  any of  its  Subsidiaries  to  purchase,  redeem  or
      otherwise acquire, any shares of its capital stock.

            (c) Issuance of  Securities.  Arch shall not and it shall not permit
      any of its  Subsidiaries  to,  issue,  deliver or sell,  or  authorize  or
      propose to issue,  deliver or sell, any shares of its capital stock of any
      class, any Voting Debt or any securities  convertible into, or any rights,
      warrants  or  options  to  acquire,  any  such  shares,   Voting  Debt  or
      convertible securities,  other than: (i) the issuance of Arch Common Stock
      upon the exercise of stock options  granted under the Arch Stock Plan that
      are outstanding on the date hereof,  or in satisfaction of stock grants or
      stock based awards made prior to the date hereof pursuant to




                                      27

<PAGE>



      the Arch Stock Plan;  and (ii)  issuances by a wholly owned  Subsidiary of
      its capital stock to its parent.

            (d)  Governing  Documents.  Except  as  contemplated  hereby  or  in
      connection  herewith,  Arch  shall  not  amend or  propose  to  amend  its
      Certificate of Incorporation or Bylaws.

            (e) No  Acquisitions.  Arch shall not and it shall not permit any of
      its   Subsidiaries   to,  acquire  or  agree  to  acquire  by  merging  or
      consolidating with, or by purchasing a substantial equity interest in or a
      substantial portion of the assets of, or by any other manner, any business
      or  any   corporation,   partnership,   association   or  other   business
      organization or division thereof.

            (f) No Dispositions.  Other than dispositions in the ordinary course
      of  business   consistent  with  past  practice  that  are  not  material,
      individually or in the aggregate,  to Arch and its Subsidiaries taken as a
      whole and product sales in the ordinary course of business consistent with
      past  practice,  Arch  shall  not  and  it  shall  not  permit  any of its
      Subsidiaries to sell, lease, encumber or otherwise dispose of, or agree to
      sell,  lease  (whether  such  lease is an  operating  or  capital  lease),
      encumber or otherwise dispose of, any of its assets.

            (g)  No  Dissolution,   Etc.   Except  as  otherwise   permitted  or
      contemplated  by this  Agreement,  Arch  shall not  authorize,  recommend,
      propose or  announce an  intention  to adopt a plan of complete or partial
      liquidation or dissolution of Arch or any of its Subsidiaries.

            (h) Certain Employee Matters. Arch shall not and it shall not permit
      any of its Subsidiaries to: (i) grant any increases in the compensation of
      any of its directors, officers or employees, except increases to employees
      who are not officers or  directors in the ordinary  course of business and
      in accordance  with past  practice;  (ii) pay or agree to pay any pension,
      retirement   allowance   or  other   employee   benefit  not  required  or
      contemplated  by any of the existing Arch  Employee  Benefit Plans or Arch
      Pension Plans as in effect on the date hereof to any director,  officer or
      employee,  whether past or present; (iii) enter into any new, or amend any
      existing,  employment  or  severance  or  termination  agreement  with any
      director,  officer or key employee;  (iv) become  obligated  under any new
      Arch  Employee  Benefit  Plan  or  Arch  Pension  Plan,  which  was not in
      existence prior to the date hereof,  or amend any such plan or arrangement
      in existence on the date hereof if such amendment would have the effect of
      materially  enhancing  any  benefits  thereunder;  or  (v)  terminate  the
      employment of any executive or employee of Arch without cause.

            (i) Indebtedness;  Leases; Capital Expenditures. Arch shall not, nor
      shall Arch permit any of its  Subsidiaries  to, (i) incur any indebtedness
      for borrowed  money  (except for working  capital  under  Arch's  existing
      credit   facilities,   and  refinancings  of  existing  debt  that  permit
      prepayment of such debt without penalty (other than LIBOR breakage costs))
      or guarantee any such indebtedness or issue or sell any debt securities or
      warrants or rights to acquire any debt  securities of such party or any of
      its  Subsidiaries or guarantee any debt securities of others,  (ii) except
      in the ordinary  course of business,  enter into any lease  (whether  such
      lease is an operating or capital  lease) or create any  mortgages,  liens,
      security




                                      28

<PAGE>



      interests  or other  encumbrances  on the  property  of Arch or any of its
      Subsidiaries in connection with any indebtedness  thereof, or (iii) commit
      to  aggregate  capital  expenditures  in excess of  $500,000  outside  the
      capital  budget  dated as of May 1, 1998,  as amended and approved by Arch
      prior to the date hereof and disclosed to Pogo.

      4.2   No Solicitation.

            (a) From and after  the date  hereof,  Arch  will not,  and will not
authorize or permit any of its officers,  directors,  employees, agents or other
representatives  or  those  of  any  of its  Subsidiaries  (collectively,  "Arch
Representatives")  to,  directly or indirectly,  solicit or knowingly  encourage
(including  by way of providing  information)  any  prospective  acquiror or the
invitation  or  submission  of any  inquiries,  proposals or offers or any other
efforts or attempts that  constitute,  or may reasonably be expected to lead to,
an  Acquisition  Proposal  (as defined  herein) from any person or engage in any
discussions or negotiations with respect thereto or otherwise  cooperate with or
assist or participate in or facilitate  any such  proposal;  provided,  however,
that, notwithstanding any other provision of this Agreement, (i) Arch's Board of
Directors may take and disclose to Arch's  stockholders a position  contemplated
by Rule 14e-2(a) promulgated under the Exchange Act or make any other disclosure
to Arch's  stockholders if failure to so disclose would be inconsistent with the
fiduciary  duties of the Board of  Directors of Arch to its  stockholders  under
applicable  law and (ii)  following  receipt  from a third  party  (without  any
solicitation, initiation, encouragement,  discussion or negotiation, directly or
indirectly,  by or  with  Arch  or any  Arch  Representatives)  of a  bona  fide
Acquisition  Proposal that is financially  superior to the Merger and reasonably
capable of being  financed (as  determined  in each case in good faith by Arch's
Board of Directors after consultation with Arch's financial advisors),  (x) Arch
may engage in discussions or negotiations  with such third party and may furnish
such third party information  concerning Arch, and its business,  properties and
assets if such third party  executes a  confidentiality  agreement in reasonably
customary  form and (y) the Board of Directors of Arch may  withdraw,  modify or
not make  its  recommendation  referred  to in  Section  5.3 or  terminate  this
Agreement in accordance with Section 7.1(f), but in each case referred to in the
foregoing clauses (i) and (ii) only to the extent that the Board of Directors of
Arch shall conclude in good faith after consultation with Arch's outside counsel
that such action is necessary in order for the Board of Directors of Arch to act
in a manner that is consistent with its fiduciary  obligations  under applicable
law notwithstanding any concessions that may be offered by Pogo.

            (b) Arch  shall  immediately  cease and cause to be  terminated  any
existing  solicitation,   initiation,  encouragement,  activity,  discussion  or
negotiation  with  any  parties  conducted   heretofore  by  Arch  or  any  Arch
Representatives  with respect to any Acquisition  Proposal  existing on the date
hereof.

            (c) Prior to taking any action  referred  to in Section  4.2(a),  if
Arch intends to participate in any such  discussions or  negotiations or provide
any such information to any such third party,  Arch shall give notice to Pogo of
such  action.  Arch will  promptly  notify  Pogo of any such  requests  for such
information or the receipt of any Acquisition  Proposal,  including the identity
of the person or group engaging in such discussions or negotiations,  requesting
such information or making such Acquisition Proposal, and the material terms and
conditions of any Acquisition Proposal.





                                      29

<PAGE>



            (d) Nothing in this  Section 4.2 shall permit Arch to enter into any
agreement  with  respect  to an  Acquisition  Proposal  during  the term of this
Agreement  (it being agreed that during the term of this  Agreement,  Arch shall
not enter into any  agreement  with any person that  provides for, or in any way
facilitates,  an Acquisition Proposal other than a confidentiality  agreement in
the form referred to above).

            (e) As used in this Agreement, "Acquisition Proposal" shall mean any
proposal  or  offer,  other  than a  proposal  or  offer  by  Pogo or any of its
affiliates,  for, or that could be  reasonably  expected to lead to, a tender or
exchange offer, a merger,  consolidation or other business combination involving
Arch or any  Significant  Subsidiary  of Arch or any  proposal to acquire in any
manner a  substantial  equity  interest  in, or any  substantial  portion of the
assets of, Arch or any of its Subsidiaries.


                                   ARTICLE V

                             ADDITIONAL AGREEMENTS

      5.1  Preparation  of S-4 and the  Proxy  Statement.  Pogo and  Arch  shall
promptly  prepare  and file  with the SEC the  Proxy  Statement  and Pogo  shall
prepare  and file with the SEC the S-4,  in which the  Proxy  Statement  will be
included as a prospectus. Each of Pogo and Arch shall use all reasonable efforts
to have the S-4  declared  effective  under the  Securities  Act as  promptly as
practicable  after such filing.  Each of Arch and Pogo shall use all  reasonable
efforts to cause the Proxy Statement to be mailed to stockholders of Arch at the
earliest  practicable date. Pogo shall use all reasonable  efforts to obtain all
necessary  state   securities   laws  or  "blue  sky"  permits,   approvals  and
registrations in connection with the issuance of Pogo Common Stock in the Merger
and upon the  exercise of Arch Stock  Options (as defined in Section  5.8),  and
Arch shall  furnish  all  information  concerning  Arch and the  holders of Arch
Common Stock and Convertible  Preferred Stock as may be reasonably  requested in
connection with obtaining such permits,  approvals and registrations.  If at any
time prior to the  Effective  Time any event with  respect to Arch or any of its
Subsidiaries,  or with  respect  to  other  information  supplied  by  Arch  for
inclusion in the Proxy Statement or the S-4, shall occur which is required to be
described in an amendment  of, or a  supplement  to, the Proxy  Statement or the
S-4, such event shall be so described, and such amendment or supplement shall be
promptly  filed  with the SEC  and,  as  required  by law,  disseminated  to the
stockholders of Arch. The Proxy Statement and the S-4,  insofar as it relates to
Arch or its  Subsidiaries  or other  information  supplied by Arch for inclusion
therein,  will comply as to form in all material respects with the provisions of
the Exchange Act and the rules and regulations thereunder.  If at any time prior
to the Effective Time any event with respect to Pogo or any of its Subsidiaries,
or with respect to other  information  supplied by Pogo or Sub for  inclusion in
the S-4,  shall occur which is required to be described in an amendment of, or a
supplement to, the S-4, such event shall be so described,  and such amendment or
supplement  shall be promptly filed with the SEC. The S-4, insofar as it relates
to Pogo, Sub or other Subsidiaries of Pogo or other information supplied by Pogo
or Sub for inclusion  therein,  will comply as to form in all material  respects
with  the  provisions  of  the  Exchange  Act  and  the  rules  and  regulations
thereunder.






                                      30

<PAGE>



      5.2 Access to Information.  Upon reasonable notice,  Arch shall (and shall
cause  each  of  its  Subsidiaries  to)  afford  to  the  officers,   employees,
accountants,  counsel and other  representatives of Pogo, access,  during normal
business hours during the period prior to the Effective  Time, to all of its and
its  Subsidiaries'  properties,   books,  contracts,   commitments  and  records
(including reasonable environmental testing). Upon reasonable notice, Pogo shall
(and  shall  cause  each of its  Subsidiaries  to)  afford to the  officers  and
employees of Arch, access,  during normal business hours during the period prior
to the Effective Time, to all of its and its  Subsidiaries'  properties,  books,
contracts,  commitments and records.  During such period,  each of Arch and Pogo
shall  (and  shall  cause  each of their  respective  Subsidiaries  to)  furnish
promptly to the other a copy of each report,  schedule,  registration  statement
and other  document  filed or received by it during such period  pursuant to SEC
requirements.  Each of Arch and Pogo agrees that it will not, and will cause its
respective representatives not to, use any information obtained pursuant to this
Section 5.2 or otherwise pursuant to this Agreement for any purpose unrelated to
the consummation of the transactions  contemplated by this Agreement. The Mutual
Confidentiality  Agreement dated as of April 2, 1998, between Pogo and Arch (the
"Confidentiality  Agreement") shall apply with respect to information  furnished
thereunder or hereunder and any other activities  contemplated  thereby.  In the
event that either Arch or Pogo,  in the course of  reviewing  the other  party's
properties,  books, contract,  commitments or records, gains actual knowledge of
any information that would cause a representation  or warranty in this Agreement
to be inaccurate or untrue in any material  respect,  such party shall  promptly
advise the other party of such information.

      5.3 Arch  Stockholders  Meeting.  Subject to the  fiduciary  duties of the
directors under applicable law, Arch shall call a meeting of its stockholders to
be held as  promptly  as  practicable  after the date  hereof for the purpose of
voting upon this Agreement and the Merger (the "Stockholders Meeting").  Subject
only to the  proviso  of  Section  4.2(a),  Arch  will,  through  its  Board  of
Directors,  recommend  to its  stockholders  approval  of such  matters  and not
rescind such  recommendation  and shall use its best efforts to obtain  approval
and adoption of this  Agreement and the Merger by its  stockholders.  Arch shall
use all reasonable efforts to hold such meeting as soon as practicable after the
date upon which the S-4 becomes effective.

      5.4 Filings;  Other  Action.  Subject to the terms and  conditions  herein
provided,  Pogo and Arch shall: (a) promptly make their  respective  filings and
thereafter make any other required submissions under the HSR Act with respect to
the Merger;  (b) use all reasonable efforts to cooperate with one another in (i)
determining  which filings are required to be made prior to the  Effective  Time
with, and which consents,  approvals,  permits or authorizations are required to
be  obtained  prior to the  Effective  Time  from,  governmental  or  regulatory
authorities of the United States,  the several states and foreign  jurisdictions
in  connection  with  the  execution  and  delivery  of this  Agreement  and the
consummation  of the Merger and the  transactions  contemplated  hereby and (ii)
timely making all such filings and timely seeking all such consents,  approvals,
permits  or   authorizations;   (c)   furnish  the  other  with  copies  of  all
correspondence,  filings and  communications  (and  memoranda  setting forth the
substance  thereof)  between  them and their  affiliates  and  their  respective
representatives,  on the one hand, and any governmental or regulatory  authority
or members or their respective  staffs,  on the other hand, with respect to this
Agreement and the transactions  contemplated  hereby; (d) furnish the other with
such necessary  information and reasonable  assistance as such other parties and
their  respective  affiliates  may reasonably  request in connection  with their
preparation of necessary filings, registrations or submissions of information




                                      31

<PAGE>



to any governmental or regulatory authorities,  including without limitation any
filings  necessary  under  the  provisions  of the HSR  Act;  and (e) use  their
commercially  reasonable efforts to take, or cause to be taken, all other action
and do, or cause to be done, all other things  necessary,  proper or appropriate
to consummate and make effective the Merger and the transactions contemplated by
this Agreement including,  without limitation,  the resolution of objections, if
any, as may be asserted by any governmental authority with respect to the Merger
and the  transactions  contemplated  hereby  under  any  antitrust  or  trade or
regulatory laws or regulations of any governmental authority; provided that Pogo
and Arch shall not be  required  to take any action  that could have any adverse
effect on the business,  operations,  prospects, assets, condition (financial or
otherwise) or results of operations of Pogo or Arch (including any  Subsidiaries
thereof).

      5.5 Agreements of Others. Prior to the Effective Time, Arch shall cause to
be prepared  and  delivered to Pogo a list  identifying  all persons who, at the
time of the  Stockholders  Meeting,  may be deemed to be "affiliates" of Arch as
that term is used in paragraphs (c) and (d) of Rule 145 under the Securities Act
(the  "Affiliates").  Arch shall use all reasonable efforts to cause each person
who is  identified  as an Affiliate in such list to deliver to Pogo, at or prior
to the Effective Time, a written  agreement,  in substantially the form attached
as Exhibit B hereto,  that such  Affiliate  will not sell,  pledge,  transfer or
otherwise  dispose of any shares of Pogo Common Stock  issued to such  Affiliate
pursuant to the Merger, except pursuant to an effective  registration  statement
or  in  compliance  with  Rule  145  or  an  exemption  from  the   registration
requirements  of the  Securities  Act.  Arch shall use its best efforts to cause
each person who is  identified as an Affiliate in such list to sign prior to the
thirtieth day prior to the Effective Time, a written agreement, in substantially
the form  attached as Exhibit C hereto,  that such party will not sell or in any
other way reduce such party's risk  relative to any shares of Arch Common Stock,
Arch  Preferred  Stock,  Pogo Common Stock or securities  convertible  into Pogo
Common Stock controlled, owned or held by such Affiliate prior to the Merger, or
Pogo Common Stock  received in the Merger  (within the meaning of Section 201.01
of the SEC's Financial  Reporting Release No. 1), or any securities  convertible
into Pogo Common Stock, until such time as financial results (including combined
sales and net income)  covering at least 30 days of post-merger  operations have
been published,  except as permitted by Staff Accounting Bulletin No. 76 (or any
successor thereto) issued by the SEC.

      5.6  Authorization  for Shares and Stock  Exchange  Listing.  Prior to the
Effective Time, Pogo shall have taken all action necessary to permit it to issue
the number of shares of Pogo  Common  Stock  required  to be issued  pursuant to
Section 2.1. Pogo shall use all  reasonable  efforts to cause the shares of Pogo
Common  Stock to be issued in the Merger and the shares of Pogo Common  Stock to
be reserved for issuance upon exercise of Arch Stock Options and issuances under
the Arch Stock Plan to be approved for listing on the NYSE,  subject to official
notice of issuance, prior to the Closing Date.

      5.7 Employee  Matters.  All  persons,  other than the  executive  officers
listed on  Schedule  5.7 (the  "Executives"),  who are  employed  by Arch or its
Subsidiaries  immediately  prior to the Effective Time, shall be employed by the
Surviving Corporation  immediately after the Effective Time, it being understood
that  Pogo and the  Surviving  Corporation  shall  not have any  obligations  to
continue  employing such employees for any length of time  thereafter.  Prior to
the Effective Time, Arch agrees to make no representations or promises,  oral or
written,   to  employees  of  Arch  concerning  either  (a)  employment  or  (b)
compensation, in each case, in respect to such employment




                                      32

<PAGE>



after the  Effective  Time  without  the prior  consent  of Pogo.  Pogo and Arch
further  agree that any person  (other than the  Executives)  who is employed by
Arch or any of its Subsidiaries immediately prior to the Effective Time shall be
entitled to  participate,  from and after the Effective Time, in all pension and
benefit plans that are available to similarly  situated salaried Pogo employees,
generally,  who  reside  in the  United  States.  All  persons  (other  than the
Executives)  who are  employed  by Arch or any of its  Subsidiaries  immediately
prior to the  Effective  Time  shall,  from and after  the  Effective  Time,  be
considered  employees  of Pogo,  or a subsidiary  of Pogo,  as  applicable,  for
purposes of participation and vesting under any existing or future Pogo salaried
employee  benefit or pension  plan.  Service by such  employee with Arch and its
Subsidiaries  prior to the Effective Time shall not (i)  constitute  service for
any  purposes  under any of the Pogo  salaried  employee  benefit  plans or (ii)
constitute service for participation and vesting purposes under any Pogo pension
plans.  Persons (other than  Executives)  who are employed by Arch or any of its
Subsidiaries  prior to the  Effective  Time  who  remain  with  Arch  until  the
Effective Time and are terminated at the Effective Time or within six (6) months
following  the  Effective  Time (other than for cause) shall  receive a one time
severance  payment  equal to three (3) weeks salary for each year of  continuous
service with Arch or any of its  Subsidiaries.  For purposes of calculating  the
one-time  severance  payment,  an employee's  salary shall be the higher of such
employee's  salary  at  either  (x) the  Effective  Time or (y) such  employee's
termination;  and the severance  payment for any partial year of such continuous
service shall be prorated.

      5.8 Stock Options.  (a) At the Effective Time, each outstanding  option to
purchase Arch Common Stock that has been granted pursuant to the Arch Stock Plan
("Arch  Stock  Option")  shall be  treated  as set  forth in this  Section  5.8;
provided however,  that from and after the date hereof, Arch shall not (i) grant
additional  Arch  Stock  Options,  (ii) grant any stock  appreciation  rights or
limited stock appreciation rights, (iii) take any action or permit the committee
charged with management of the Arch Stock Plan to take any action under the Arch
Stock Plan other than the issuance of Arch Common Stock to employees  other than
Affiliates in the ordinary  course and  consistent  with past  practices,  or to
alter or amend or terminate the Arch Stock Plan or in  connection  with any Arch
Stock Option granted pursuant thereto including,  without limitation, any action
permitting  cash  payments  to  holders  of Arch  Stock  Options  in lieu of the
treatment otherwise provided in this Section 5.8.

       (b) Each Arch Stock Option shall, as of the Effective Time, be assumed by
Pogo in accordance  with the terms hereof.  As so assumed,  such option shall be
deemed to constitute an option to acquire,  on the same terms and  conditions as
were applicable  under such Arch Stock Option, a number of shares of Pogo Common
Stock equal to the number of shares of Arch Common Stock purchasable pursuant to
such  exercisable  portion of such Arch Stock  Option  multiplied  by the Common
Exchange Ratio,  at a price per share equal to the per-share  exercise price for
the shares of Arch Common Stock  purchasable  pursuant to such Arch Stock Option
divided by the Common  Exchange  Ratio;  provided,  however,  that the number of
shares of Pogo Common  Stock that may be  purchased  upon  exercise of such Arch
Stock Option shall not include any  fractional  share and, upon exercise of such
Arch Stock Option,  a cash payment shall be made for any fractional  share based
upon the arithmetic  average of the high and low trading prices  ("regular way")
of a share  of Pogo  Common  Stock  on the  NYSE on the  date of  exercise;  and
provided  further,  that in the case of any option to which  Section  421 of the
Code applies by reason of its qualification under any of sections 422-424 of the
Code, the option price, the number of shares purchasable pursuant to such option
and




                                      33

<PAGE>



the terms and conditions of exercise of such option shall be determined in order
to comply with Section 424(a) of the Code.  After the Effective Time,  except as
provided above in this Section 5.8(b),  each assumed option shall fully vest and
be immediately exercisable, but shall otherwise be subject to the same terms and
conditions as were applicable to the related Arch Stock Option immediately prior
to the Effective Time.

      (c) Pogo shall take all corporate action necessary to reserve for issuance
a sufficient number of shares of Pogo Common Stock for delivery upon exercise of
the Arch Stock Options  assumed in accordance  with this Section 5.8. As soon as
practicable   after  the  Effective  Time,  Pogo  shall  file  with  the  SEC  a
registration   statement  on  Form  S-8  (or  any  successor  form)  or  another
appropriate  form with respect to the shares of Pogo Common Stock subject to the
Arch  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 Arch Stock Options remain outstanding.

      5.9 Arch Bank Credit  Facilities.  At or prior to the Closing,  Pogo shall
refinance (or arrange for the continuation of) or repay all of Arch's debt under
its bank credit  facilities  with Bank One Texas,  N.A. and Bank of Montreal and
the other lenders thereunder (the "Bank Credit Facilities").

      5.10  Modification  of  Indebtedness  and  Equity.   Except  as  otherwise
expressly  permitted by this  Agreement or unless  permitted by Pogo in writing,
neither  Arch  nor any  Subsidiary  shall  take any  action  to  amend,  modify,
terminate, forgive, cancel, retire, purchase or pay early or on terms other than
as expressly  permitted  by any  instrument  governing  such  indebtedness,  any
indebtedness  of,  or  to,  the  Company  including,   without  limitation,  the
Affiliated  Notes, the Notes,  the Convertible  Preferred Stock, the Bank Credit
Facilities, the production payment with Enron Reserve Acquisition Corp., and all
other payables and receivables of Arch and its Subsidiaries, other than payments
made or received in the ordinary  course of business  that are  consistent  with
past  practices and the express  written terms of any agreement  governing  such
indebtedness;  provided however, that neither Arch nor any Subsidiary shall make
any payment on any indebtedness that would require a material prepayment penalty
without the written permission of Pogo in each instance.

      5.11  Agreement  to  Defend.  In  the  event  any  claim,   action,  suit,
investigation or other proceeding by any Governmental  Entity or other person or
other  legal or  administrative  proceeding  is  commenced  that  questions  the
validity or legality of the transactions contemplated hereby or seeks damages in
connection  therewith,  the  parties  hereto  agree to  cooperate  and use their
reasonable efforts to defend against and respond thereto.

      5.12 Public Announcements.  Pogo and Sub on the one hand, and Arch, on the
other hand,  will consult with each other  before  issuing any press  release or
otherwise  making  any  public  statements  with  respect  to  the  transactions
contemplated  by this  Agreement,  and shall not issue any such press release or
make any such  public  statement  prior to such  consultation,  except as may be
required by applicable law or by obligations  pursuant to any listing  agreement
with any national securities exchange or transaction reporting system.





                                      34

<PAGE>



      5.13 Other Actions. Except as contemplated by this Agreement, neither Pogo
nor Arch  shall,  nor shall they  permit any of their  Subsidiaries  to, take or
agree or commit to take any action that is reasonably likely to result in any of
its  respective  representations  or  warranties  hereunder  being untrue in any
material  respect or in any of the conditions to the Merger set forth in Article
VI not being satisfied.

      5.14  Advice of  Changes;  SEC  Filings.  Pogo and Arch shall  confer on a
regular basis with each other, report on operational matters and promptly advise
each  other  orally and in  writing  of any  change or event  having,  or which,
insofar as can reasonably be foreseen,  could have, a Material Adverse Effect on
Pogo or Arch,  as the case may be.  Arch and Pogo shall  promptly  provide  each
other (or their  respective  counsel)  copies of all filings  made by such party
with the SEC or any other  state or federal  Governmental  Entity in  connection
with this Agreement and the transactions contemplated hereby.

      5.15 Reorganization.  It is the intention of Pogo and Arch that the Merger
will qualify as a  reorganization  described in Section  368(a) of the Code (and
any comparable  provisions of applicable state law).  Neither Pogo nor Arch (nor
any of their  respective  Subsidiaries)  will  take or omit to take  any  action
(whether  before,  on or after the Closing Date) that would cause the Merger not
to  be  so  treated.  The  parties  will  characterize  the  Merger  as  such  a
reorganization for purposes of all Returns and other filings.

      5.16 Accounting Matters. During the period from the date of this Agreement
through the Effective Time, unless the parties shall otherwise agree in writing,
neither Arch nor any Subsidiary of Arch shall knowingly take or fail to take any
reasonable  action  requested  by Pogo  which  action  or  failure  to act would
jeopardize  the  treatment  of  Sub's  combination  with  Arch as a  pooling  of
interests for accounting purposes.

      5.17  Indemnification.  (a) Arch shall,  and from and after the  Effective
Time,  Pogo and the  Surviving  Corporation  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
Arch or any of its Subsidiaries (the "Indemnified  Parties") against all losses,
claims,  damages,  costs, expenses (including  attorneys' fees),  liabilities or
judgments  or  amounts  that are paid in  settlement  with the  approval  of the
indemnifying party (which approval shall not be unreasonably  withheld) of or in
connection  with any  threatened or actual claim,  action,  suit,  proceeding or
investigation based in whole or in part on or arising in whole or in part out of
the fact that such person is or was a director,  officer, or employee of Arch or
any Arch Subsidiary whether pertaining to any matter existing or occurring at or
prior to the Effective  Time and whether  asserted or claimed prior to, or at or
after, the Effective Time ("Indemnified Liabilities"), including all Indemnified
Liabilities based in whole or in part on, or arising in whole or in part out of,
or pertaining to this Agreement or the transactions contemplated hereby, in each
case to the full extent  permitted under  applicable  Delaware law (and Pogo and
the Surviving  Corporation,  as the case may be, will pay expenses in advance of
the final disposition of any such action or proceeding to each Indemnified Party
to the full extent  permitted by law).  Without  limiting the foregoing,  in the
event any such claim,  action,  suit,  proceeding  or  investigation  is brought
against any Indemnified  Parties  (whether arising before or after the Effective
Time), (i) the Indemnified Parties may retain counsel reasonably satisfactory to
Pogo  and  Arch (or them  and  Pogo  and the  Surviving  Corporation  after  the
Effective




                                      35

<PAGE>



Time) and Arch (or after the Effective Time, Pogo and the Surviving Corporation)
shall pay all fees and  expenses  of such  counsel for the  Indemnified  Parties
promptly  as  statements  therefor  are  received;  and (ii)  Arch (or after the
Effective  Time,  Pogo and the Surviving  Corporation)  will use all  reasonable
efforts to assist in the  vigorous  defense of any such  matter,  provided  that
neither  Arch,  Pogo  nor the  Surviving  Corporation  shall be  liable  for any
settlement effected without its written consent,  which consent,  however, shall
not  be  unreasonably   withheld.   Any  Indemnified   Party  wishing  to  claim
indemnification  under this  Section  5.17,  upon  learning  of any such  claim,
action,  suit,  proceeding  or  investigation,  shall  notify Arch (or after the
Effective  Time,  Pogo and the  Surviving  Corporation),  but the  failure so to
notify shall not relieve a party from any liability  that it may have under this
Section  5.17,  except to the extent such  failure  materially  prejudices  such
party.  The  Indemnified  Parties  as a group  may  retain  only one law firm to
represent  them  with  respect  to each  such  matter  unless  there  is,  under
applicable  standards of  professional  conduct,  a conflict on any  significant
issue between the positions of any two or more Indemnified  Parties.  Arch, Pogo
and Sub agree that all rights to indemnification,  including provisions relating
to advances of expenses  incurred in defense of any action or suit,  existing in
favor of the Indemnified  Parties (including in the Certificate of Incorporation
or Bylaws of Arch or in the  indemnification  agreements  previously provided to
Pogo) with  respect to matters  occurring  through  the  Effective  Time,  shall
survive  the Merger and shall  continue in full force and effect for a period of
six  years  from the  Effective  Time;  provided,  however,  that all  rights to
indemnification  in  respect of any  Indemnified  Liabilities  asserted  or made
within such period shall  continue  until the  disposition  of such  Indemnified
Liabilities.  In the event  Pogo or the  Surviving  Corporation  or any of their
respective  successors or assigns (x)  consolidates  with or merges with or into
any  other  person  and  shall  not  be  the  surviving   corporation   in  such
consolidation or merger and (y) transfers all or substantially all of its assets
and properties to any person, then, in each such case, proper provision shall be
made so that the successors and assigns of Pogo or the Surviving Corporation, as
the case may be, honor the indemnification obligations set forth in this Section
5.17.

      5.18  Announcement of Combined  Operations.  Pogo shall use all reasonable
efforts to publish,  by public filing or announcement,  the results of the first
full calendar month of combined  operations of Pogo and Arch after the Effective
Time as soon  as is  commercially  practicable  after  the end of such  calendar
month,  but in no event  more than  sixty  (60) days  after the end of such full
calendar month.


                                  ARTICLE VI

                             CONDITIONS PRECEDENT

      6.1  Conditions  to Each  Party's  Obligation  to Effect the  Merger.  The
respective obligation of each party to effect the Merger shall be subject to the
satisfaction prior to the Closing Date of the following conditions:

            (a) Arch Stockholder  Approval.  This Agreement and the Merger shall
      have been approved and adopted by the  affirmative  vote of the holders of
      (i) a majority of the outstanding  shares of Arch Common Stock entitled to
      vote  thereon  and (ii)  two-thirds  of the  Convertible  Preferred  Stock
      outstanding.




                                      36


<PAGE>



            (b) NYSE Listing.  The shares of Pogo Common Stock  issuable to Arch
      stockholders  pursuant  to this  Agreement  and such other  shares of Pogo
      Common Stock  required to be reserved for issuance in connection  with the
      Merger shall have been  authorized  for listing on the NYSE upon  official
      notice of issuance.

            (c)  Other   Approvals.   The  waiting  period   applicable  to  the
      consummation  of the Merger  under the HSR Act shall have  expired or been
      terminated and all filings required to be made prior to the Effective Time
      with, and all consents,  approvals, permits and authorizations required to
      be obtained  prior to the Effective Time from any  Governmental  Entity in
      connection  with the  execution  and  delivery of this  Agreement  and the
      consummation of the transactions contemplated hereby by Arch, Pogo and Sub
      shall have been made or obtained  (as the case may be),  except  where the
      failure to obtain such consents,  approvals,  permits,  and authorizations
      would not be reasonably  likely to result in a Material  Adverse Effect on
      Pogo or Arch  (assuming  the  Merger  has taken  place)  or to  materially
      adversely  affect the  consummation  of the Merger,  and no such  consent,
      approval,  permit or  authorization  shall impose terms or conditions that
      would have,  or would be  reasonably  likely to have,  a Material  Adverse
      Effect on Pogo or Arch  (assuming  the  Merger  has taken  place).  Unless
      otherwise  agreed  to by  Pogo,  no  such  consent,  approval,  permit  or
      authorization shall then be subject to appeal.

            (d) S-4. The S-4 shall have become  effective  under the  Securities
      Act and shall not be the subject of any stop order or proceedings  seeking
      a stop order.

            (e) No Injunctions or Restraints.  No temporary  restraining  order,
      preliminary or permanent  injunction or other order issued by any court of
      competent  jurisdiction  or  other  legal  restraint  or  prohibition  (an
      "Injunction")  preventing  the  consummation  of the  Merger  shall  be in
      effect.

      6.2 Conditions of Obligations of Pogo and Sub. The obligations of Pogo and
Sub to effect the  Merger  are  subject  to the  satisfaction  of the  following
conditions,  any or all of which  may be  waived in whole or in part by Pogo and
Sub:

            (a) Representations and Warranties.  Each of the representations and
      warranties of Arch set forth in this  Agreement  shall be true and correct
      in all material  respects as of the date of this  Agreement and (except to
      the extent  such  representations  and  warranties  speak as of an earlier
      date) as of the Closing Date as though made on and as of the Closing Date,
      except  where  the  failure  to be so true and  correct  would  not have a
      Material  Adverse Effect on Arch,  except for general  economic changes or
      changes that may affect the oil and gas industry generally.

            (b) Performance of Obligations of Arch. Arch shall have performed in
      all material respects all obligations required to be performed by it under
      this Agreement at or prior to the Closing Date.






                                      37

<PAGE>



            (c) Letters from Arch Affiliates. Pogo shall have received from each
      Affiliate  an executed  copy of agreement or  agreements  contemplated  by
      Section 5.5.

            (d) Absence of Certain Action. No Injunction shall be in effect as a
      result of or related to the Merger (i)  imposing any  limitation  upon the
      ability of Pogo or any of its  Subsidiaries  effectively  to  control  the
      business  or  operations  of  Pogo,  Arch  or  any  of  their   respective
      Subsidiaries or (ii) prohibiting or imposing any limitation upon Pogo's or
      Arch's or any of their Subsidiaries'  ownership or operation of all or any
      portion of the business or assets or  properties of Pogo or Arch or any of
      their  respective  Subsidiaries or compelling Pogo or Arch or any of their
      respective  Subsidiaries  to divest or hold separate all or any portion of
      the  business  or  assets  or  properties  of Pogo or Arch or any of their
      respective Subsidiaries, or imposing any other limitation upon any of them
      in the  conduct  of  their  businesses,  and no  suit or  proceeding  by a
      governmental  authority  seeking  such  an  Injunction  or  an  Injunction
      preventing or making illegal the  consummation of any of the Mergers shall
      be pending.

            (e) Conversion of the Notes. At or prior to the Closing,  holders of
      the Notes shall have converted the  outstanding  principal  amount of, and
      accrued interest on, their Notes into Pogo Common Stock as contemplated in
      Section 2.3(a).

            (f) Affiliate  Notes.  All holders of the Affiliate Notes shall have
      made the election  provided in Section 2.3(b) with respect to all of their
      Affiliate  Notes.  Notification  of such election shall have been made, in
      writing, to Sub.

            (g)   Pooling.   Pogo  shall  either  (i)  have   received   written
      notification  from the SEC that the Merger will qualify as a "pooling" for
      financial  accounting  purposes  or (ii) the written  opinion  from Arthur
      Andersen  LLP  dated  May 22,  1998,  shall  not  have  been  modified  or
      rescinded,  nor  shall  there  be any  material  changes  in the  facts or
      assumptions  which are the basis thereof,  which would cause the Merger to
      fail to qualify as a "pooling" for financial accounting purposes except to
      the extent that any such failure to so qualify is  attributable to actions
      taken, or failed to be taken, by Pogo after the date hereof.

            (h) Resignation  and Release.  Pogo shall have received from each of
      the  officers  named  on  Schedule  5.7,  a  Resignation  and  Release  in
      substantially the form attached hereto as Exhibit D.

      6.3  Conditions of  Obligations  of Arch. The obligation of Arch to effect
the Merger is subject to the  satisfaction of the following  conditions,  any or
all of which may be waived in whole or in part by Arch:

            (a) Representations and Warranties.  Each of the representations and
      warranties of Pogo and Sub set forth in this  Agreement  shall be true and
      correct in all  material  respects  as of the date of this  Agreement  and
      (except to the extent such  representations  and warranties speak as of an
      earlier  date)  as of the  Closing  Date as  though  made on and as of the
      Closing Date, except where the failure to be so true and correct would not
      have a Material Adverse




                                      38

<PAGE>



      Effect on Pogo,  except for general  economic  changes or changes that may
      affect the oil and gas industry generally.

            (b)  Performance  of Obligations of Pogo and Sub. Pogo and Sub shall
      have  performed in all material  respects all  obligations  required to be
      performed by them under this Agreement at or prior to the Closing Date.

            (c) Tax  Opinion.  Arch  shall  have  received  an opinion of Arthur
      Andersen LLP, reasonably  satisfactory to Arch (a copy of which shall have
      been delivered to Pogo), dated on or about the date that is two days prior
      to the date the Proxy  Statement is first mailed to  stockholders  of Arch
      (and  which  opinion  shall not have been  withdrawn  or  modified  in any
      material respect on or before the Closing Date) to the effect that, if the
      Merger is consummated in accordance with the terms of this Agreement,  for
      federal  income  tax  purposes,  (i)  the  Merger  will  be  treated  as a
      reorganization  within the  meaning of  Section  368(a) of the Code,  (ii)
      Pogo, Sub and Arch will each be a party to the  reorganization  within the
      meaning  of  Section  368(b)  of the  Code,  (iii) no gain or loss will be
      recoqnized  by Arch,  Pogo or Sub (other  than  possibly  cancellation  of
      indebtedness income to Arch upon the exchange of the Notes for Pogo Common
      Stock and (iv) no gain or loss will be recognized by the  stockholders  of
      Arch upon the  exchange of their  shares  solely for shares of Pogo Common
      Stock  pursuant to the Merger (except with respect to any cash received in
      lieu of fractional  shares).  The party rendering such opinion may receive
      and rely upon  representations  contained in certificates of Pogo, Sub and
      Arch, substantially in the form of Schedules 6.3(c)(i) and 6.3(c)(ii).


                                  ARTICLE VII

                           TERMINATION AND AMENDMENT

      7.1  Termination.  This  Agreement may be terminated and the Merger may be
abandoned  at any time  prior to the  Effective  Time,  whether  before or after
approval  of  the  matters  presented  in  connection  with  the  Merger  by the
stockholders of Arch:

            (a) by mutual written  consent of Arch and Pogo, or by mutual action
      of their respective Boards of Directors;

            (b) by  either  Arch or Pogo if (i) the  Merger  shall not have been
      consummated  by September 30, 1998  (provided  that the right to terminate
      this  Agreement  under this clause (i) shall not be available to any party
      whose  failure to fulfill any covenant or agreement  under this  Agreement
      has been the cause of or resulted in the failure of the Merger to occur on
      or before such date);  (ii) any court of competent  jurisdiction,  or some
      other  governmental  body or  regulatory  authority  shall have  issued an
      order, decree or ruling or taken any other action permanently restraining,
      enjoining  or  otherwise  prohibiting  the Merger and such order,  decree,
      ruling or other  action  shall have become  final and  non-appealable;  or
      (iii) any required approval of the Arch  stockholders  shall not have been
      obtained by reason of the




                                      39

<PAGE>



     failure to obtain the required vote upon a vote held at a duly held meeting
     of stockholders or at any adjournment thereof;

          (c) by Pogo if (i)  for any  reason  Arch  fails  to call  and  hold a
     stockholders  meeting for the purpose of voting upon this Agreement and the
     Merger by September  1, 1998  (provided  that the right to  terminate  this
     Agreement  under this Section 7.1(c) shall not be available to Pogo if Arch
     would be entitled to terminate  this  Agreement  under Section 7.1(d) or if
     the S-4 did not become effective at least 30 days prior to such date); (ii)
     Arch shall have failed to comply in any  material  respect  with any of the
     covenants or agreements  contained in this Agreement to be complied with or
     performed by Arch at or prior to such date of  termination  (provided  such
     breach  has not been  cured  within 15 days  following  receipt  by Arch of
     notice of such breach and is existing  at the time of  termination  of this
     Agreement);  (iii) any representation or warranty of Arch contained in this
     Agreement  shall not be true in all material  respects when made  (provided
     such breach has not been cured within 15 days following  receipt by Arch of
     notice of such breach and is existing  at the time of  termination  of this
     Agreement) or on and as of the time of such  termination  as if made on and
     as of such time  (except to the extent it  relates to a  particular  date),
     except  where  the  failure  to be so true  and  correct  would  not have a
     Material  Adverse Effect on Arch,  except for general  economic  changes or
     changes that may affect the oil and gas industry  generally;  or (iv) after
     the date hereof there has been any Material  Adverse Change with respect to
     Arch,  except for general  economic  changes or changes that may affect the
     oil  and  gas  industry  generally  or  for  changes  in the  business  and
     operations of Arch  proximately  caused by its entering into this Agreement
     or performing its obligations hereunder;

          (d) by Arch if (i) Pogo or Sub  shall  have  failed  to  comply in any
     material respect with any of the covenants or agreements  contained in this
     Agreement  to be complied  with or performed by it at or prior to such date
     of  termination  (provided  such  breach has not been cured  within 15 days
     following  receipt by Pogo of notice of such  breach and is existing at the
     time of termination of this Agreement); (ii) any representation or warranty
     of  Pogo  or Sub  contained  in  this  Agreement  shall  not be true in all
     material respects when made (provided such breach has not been cured within
     15 days following  receipt by Pogo of notice of such breach and is existing
     at the time of termination  of this  Agreement) or on and as of the time of
     such termination as if made on and as of such time (except to the extent it
     relates to a particular  date),  except where the failure to be so true and
     correct  would  not have a  Material  Adverse  Effect on Pogo,  except  for
     general  economic  changes  or  changes  that  may  affect  the oil and gas
     industry  generally;  or (iii)  after  the date  hereof  there has been any
     Material  Adverse Change with respect to Pogo,  except for general economic
     changes or changes that may affect the oil and gas industry generally;

          (e) by Pogo if (i) the Board of Directors of Arch shall have withdrawn
     or modified,  in any manner which is adverse to Pogo, its recommendation or
     approval of the Merger or this Agreement and the transactions  contemplated
     hereby or shall have  resolved to do so, or (ii) the Board of  Directors of
     Arch shall have presented to or recommended to the stockholders of Arch any
     Acquisition  Proposal or any  transaction  described in the  definition  of
     Acquisition Proposal, or shall have resolved to do so;





                                      40

<PAGE>



            (f) by Arch if Arch shall  exercise  the right  specified  in clause
      (ii) of Section 4.2(a); provided that Arch may not effect such termination
      pursuant  to this  Section  7.1(f)  unless and until (i) Pogo  receives at
      least three business days' prior written notice from Arch of its intention
      to effect such  termination  pursuant to this Section 7.1(f);  (ii) during
      such period,  Arch shall,  and shall cause its  respective  financial  and
      legal advisors to,  consider any adjustment in the terms and conditions of
      this  Agreement  that Pogo may  propose;  and (iii) Arch pays the  amounts
      required by Section 7.2 concurrently with such termination; or

            (g) by  Pogo  if any  Governmental  Entity  shall  have  issued  any
      Injunction or taken any other action permanently imposing,  prohibiting or
      compelling any of the  limitations,  prohibitions or compulsions set forth
      in Section  6.2(d) and such  Injunction  or other action shall have become
      final and non-appealable.

      7.2   Effect of Termination.

      (a) In the event of  termination  of this Agreement by any party hereto as
provided in Section 7.1, this Agreement  shall  forthwith  become void and there
shall be no liability or  obligation  on the part of any party hereto except (i)
with respect to this Section 7.2, the third and fourth sentences of Section 5.2,
Section  5.17,  and  Section  8.1 and (ii) to the extent  that such  termination
results from the willful  breach  (except as provided in Section 8.8) by a party
hereto of any of its representations or warranties or of any of its covenants or
agreements contained in this Agreement.

      (b) If Pogo or Arch terminates  this Agreement  pursuant to Section 7.1(e)
or  7.1(f),  Arch  shall,  on the day of  such  termination,  pay  Pogo a fee of
$3,000,000 in cash by wire transfer of immediately available funds to an account
designated by Pogo.

      (c) In the event Pogo  receives any fee pursuant to Section  7.2(b),  Pogo
shall not assert or pursue in any manner,  directly or indirectly,  any claim or
cause of action against Arch or any of its affiliates, stockholders, officers or
directors  based in whole or in part upon a breach of this  Agreement by them or
their receipt,  consideration,  negotiation,  recommendation,  or approval of an
Acquisition  Proposal or the exercise by Arch of its right of termination  under
Section 7.1(f).

      7.3  Amendment.  This Agreement may be amended by the parties  hereto,  by
action taken or authorized by their respective Boards of Directors,  at any time
before or after approval of the matters  presented in connection with the Merger
by the stockholders of Arch, but, after any such approval, no amendment shall be
made which by law requires  further approval by such  stockholders  without such
further  approval.  This Agreement may not be amended except by an instrument in
writing signed on behalf of each of the parties hereto.

      7.4  Extension;  Waiver.  At any time  prior to the  Effective  Time,  the
parties  hereto,  by action taken or  authorized by their  respective  Boards of
Directors,  may,  to the  extent  legally  allowed:  (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto;
(ii) waive any  inaccuracies  in the  representations  and warranties  contained
herein or in any document  delivered pursuant hereto; and (iii) waive compliance
with any of the agreements or




                                      41

<PAGE>



conditions  contained herein. Any agreement on the part of a party hereto to any
such  extension  or  waiver  shall  be  valid  only if set  forth  in a  written
instrument signed on behalf of such party.

                                 ARTICLE VIII

                              GENERAL PROVISIONS

      8.1 Payment of  Expenses.  Each party  hereto  shall pay its own  expenses
incident to preparing for entering into and carrying out this  Agreement and the
consummation of the transactions  contemplated hereby, whether or not the Merger
shall be  consummated,  except that the filing fees with  respect to the S-4 and
the printing and mailing costs of the Proxy Statement shall be paid by Pogo.

      8.2 Survival of Certain Representations,  Warranties and Agreements.  None
of the  representations,  warranties  and agreements in this Agreement or in any
instrument delivered pursuant to this Agreement shall survive the Effective Time
and any liability for breach or violation thereof shall terminate absolutely and
be of no further  force and effect at and as of the Effective  Time,  except for
the agreements contained in Sections 2.1, 2.2, 5.7 through 5.9 and Article VIII,
the  agreements  delivered  pursuant  to  Sections  5.5,  5.17  and 5.18 and the
representations, covenants and agreements contained in Section 5.15 and referred
to in Section 6.3(c). The Confidentiality  Agreement shall survive the execution
and  delivery  of this  Agreement,  and the  provisions  of the  Confidentiality
Agreement shall apply to all information and material delivered hereunder.

      8.3 Notices.  Any notice or communication  required or permitted hereunder
shall be in writing and either  delivered  personally  or  telecopied or sent by
certified or registered mail, postage prepaid,  and shall be deemed to be given,
dated and received  when so delivered  personally,  or the next  business day if
telecopied and a successful answerback message is received,  or, if mailed, five
business  days after the date of mailing to the  following  address or  telecopy
number,  or to such other  address or addresses as such person may  subsequently
designate by notice given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4999

            with a copy to:

            Robert Stillwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522





                                      42

<PAGE>



      (b)   if to Arch, to:

            Arch Petroleum Inc.
            777 Taylor Street, Suite II
            Ft. Worth, Texas 76102
            Attention: Larry Kalas
            Facsimile: 817-332-9249

            with a copy to:

            Weil, Gotshal & Manges LLC
            100 Crescent Court, Suite 1300
            Dallas, Texas 75201
            Attention: R.  Scott Cohen
                       Craig W.  Adas
            Facsimile: 214-746-7777

      8.4  Interpretation.  When a  reference  is  made  in  this  Agreement  to
Sections,  such  reference  shall  be to a  Section  of  this  Agreement  unless
otherwise  indicated.  The table of  contents,  glossary  of  defined  terms and
headings  contained in this Agreement are for reference  purposes only and shall
not affect in any way the meaning or interpretation of this Agreement.  Whenever
the word "include,"  "includes" or "including" are used in this Agreement,  they
shall be deemed to be followed  by the words  "without  limitation."  The phrase
"made  available" in this Agreement shall mean that the information  referred to
has been made available if requested by the party to whom such information is to
be made available.  Unless the context otherwise  requires,  "or" is disjunctive
but not necessarily exclusive,  and words in the singular include the plural and
in the plural include the singular.  Any representations and warranties that are
qualified  by the phrase "to the  knowledge"  of a party or phrases with similar
wording shall be interpreted  to refer to the actual  knowledge of the executive
officers of such party or its Subsidiaries.

      8.5  Counterparts.   This  Agreement  may  be  executed  in  two  or  more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when two or more counterparts have been signed by each of
the parties and delivered to the other  parties,  it being  understood  that all
parties need not sign the same counterpart.

      8.6  Entire  Agreement;  No  Third  Party  Beneficiaries.  This  Agreement
(together  with  the  Confidentiality  Agreement  and any  other  documents  and
instruments  referred  to  herein)  (a)  constitutes  the entire  agreement  and
supersedes all prior agreements and understandings, both written and oral, among
the parties with respect to the subject matter hereto and (b) except as provided
in Sections  5.5,  5.7,  5.15,  5.16,  5.17,  5.18 and 6.3(c) is not intended to
confer  upon any person  other than the  parties  hereto any rights or  remedies
hereunder.

      8.7  Governing  Law.  This  Agreement  shall be governed and  construed in
accordance with the laws of the State of Delaware,  without giving effect to the
principles of conflicts of law thereof.





                                      43

<PAGE>



      8.8 No Remedy in Certain Circumstances. Each party agrees that, should any
court or other competent  authority hold any provision of this Agreement or part
hereof to be null, void or unenforceable,  or order any party to take any action
inconsistent  herewith or not to take an action consistent  herewith or required
hereby, the validity,  legality and  enforceability of the remaining  provisions
and  obligations  contained or set forth herein shall not in any way be affected
or impaired thereby,  unless the foregoing inconsistent action or the failure to
take an action  constitutes  a material  breach of this  Agreement  or makes the
Agreement  impossible to perform in which case this  Agreement  shall  terminate
pursuant  to  Article  VII  hereof.  Except as  otherwise  contemplated  by this
Agreement,  to the  extent  that a  party  hereto  took an  action  inconsistent
herewith  or  failed to take  action  consistent  herewith  or  required  hereby
pursuant to an order or judgment of a court or other competent  authority,  such
party shall not incur any liability or obligation unless such party breached its
obligations  under Section 5.2 hereof or did not in good faith seek to resist or
object to the imposition or entering of such order or judgment.

      8.9 Assignment. Neither this Agreement nor any of the rights, interests or
obligations hereunder shall be assigned by any of the parties hereto (whether by
operation of law or otherwise)  without the prior  written  consent of the other
parties,  except that Sub may assign, in its sole discretion,  any or all of its
rights,  interests and  obligations  hereunder to any newly formed direct wholly
owned Subsidiary of Pogo. Subject to the preceding sentence, this Agreement will
be binding upon,  inure to the benefit of and be  enforceable by the parties and
their respective successors and assigns.



        [The Remainder of This Page Has Been Intentionally Left Blank]




                                      44

<PAGE>



      IN WITNESS  WHEREOF,  each party has caused this Agreement to be signed by
its  respective  officers  thereunto duly  authorized,  all as of the date first
written above.


                                    POGO PRODUCING COMPANY



                                    By:   /s/ K. R. Good
                                          K. R. Good,
                                          Executive Vice President


                                    ALPHAC, INC.


                                    By:   /s/ K. R. Good
                                          K. R. Good,
                                          Executive Vice President


                                    ARCH PETROLEUM INC.


                                    By   /s/ Larry Kalas
                                          Larry Kalas
                                          President




                                      45

<PAGE>




                                                                     EXHIBIT A
                                                        FORM OF AFFILIATE NOTE


                               FORM OF AFFILIATE
                     AMENDED AND RESTATED PROMISSORY NOTE




STATE OF TEXAS
COUNTY OF TARRANT

$---------
Tarrant County, Texas

__________, 1998

      For  valued  received  in the  manner,  on the dates,  and in the  amounts
stipulated  below, the undersigned  __________[name]  an individual  residing in
__________,Tarrant County, Texas ("Maker"),  individually and severally promises
to pay to Arch  Petroleum  Inc. of 5 Greenway  Plaza,  Suite 2700,  Houston,  TX
77046-0504 ("Holder"), the sum of $ __________ in lawful and legal tender of the
United States of America,  together with interest on the unpaid balance from the
date of this note until maturity, payable as stated below:

      1.  Interest  Rate.  Interest  shall  accrue on the  principal  and unpaid
balance  of the note as the  rate of eight  percent  (8%)  per  annum,  prior to
maturity, and after maturity at the maximum rate permitted by law.

      2. Payment.  Principal  and interest  on this  note is due  and payable as
follows:

            (a)  Twelve  quarterly  installments  in the  amounts  set  forth on
      Schedule  2(a)  attached  hereto,   commencing   December  31,  1998,  and
      continuing each March 31, June 30, September 30 and December 31 until paid
      in full.  Payment shall be made to Holder at its address  listed above (to
      the attention of the Chief Financial  Officer) or at such other address as
      Holder may state in writing sent to Maker by United States certified mail,
      return receipt requested.

            (b) Any check,  draft,  money order,  or other  instrument  given in
      payment of all or any portion hereof and accepted by Holder and handled in
      collection  in the customary  manner and shall be deemed  delivered on the
      date so received by Holder for  purposes  of  calculating  interest on the
      principal amount, but this will not constitute


                                     1



<PAGE>







      payment  hereunder or diminish  any rights of Holder  except to the extent
      that actual cash proceeds of such instrument are unconditionally  received
      by Holder.

      3. Prepayment.  Maker at any time subsequent to the execution of this note
may prepay this note without  penalty,  in whole or in part, and in such amounts
as Maker may desire and from time to time as Maker sees fit,  prior to maturity.
Interest shall immediately cease to accrue as of the date of such prepayment, on
any amount of the principal that is so prepaid.  Any prepayment of the principal
shall be credited to the payment of the  installments  last accruing  under this
note. Prepayment of a part of this note shall not affect the Maker's obligations
to continue the regular payments stated in Schedule 2(a).

      4.  Default.  It is agreed  that time is of the  essence in this note.  If
default be made in the payment of any  installment  of principal or interest and
continue more than 30 calendar days after the quarterly due date, the Holder may
declare the entire unpaid  balance of both the  principal  and accrued  interest
immediately due and payable within 10 days of notice of default and intention to
accelerate  and then  proceed to  exercise  its rights  against  the  collateral
securing  this note,  if such  default  is not  cured.  Failure of the Holder to
exercise this option shall not constitute a waiver of Holder's right to exercise
this right in the event of any subsequent default.

      5.  Attorney  Fees. In the event of default by the Maker in the payment of
this note,  or if this note be placed in the hands of an  attorney or agency for
collection,  regardless  of  whether  or not suit is  filed,  or if this note be
collected by suit or legal process  including,  but not limited to,  through the
probate  court  or  bankruptcy  proceedings,  Maker  agrees  to  pay  all of the
reasonable  costs  and  expenses  of  Holder  incurred  in  connection  with the
collection of this note including, without limitation,  reasonable attorney fees
and expenses.

      6.  Waivers.  Except as provided in Paragraph 4 hereof,  Maker and any and
all sureties,  guarantors  and endorsers of this note, and all other parties now
or hereafter liable hereon, hereby waive grace, demand, presentment for payment,
protest,  or  notice  of any kind  (including,  but not  limited  to,  notice of
dishonor,  notice of protest,  notice of intention to accelerate,  and notice of
acceleration).

      7. Personal Liability. This note shall be the joint and several obligation
of Maker and endorsers, if any, and shall be binding upon them, individually and
severally,  their legal  representatives,  successors and assigns. The Maker and
each  endorser do not waive  demands for  payment,  presentations  for  payment,
protests  and notices of protest,  and do not agree that the time of the payment
may be extended  from time to time without  notice and without  releasing any of
the parties.

      8.  Security.   Payment  of  this  note  shall  initially  be  secured  by
________ shares  of Pogo  Producing  Company  common stock ("Pogo Common Stock")
which shall be  delivered  to Holder with a stock power duly  executed in blank.
Following receipt of each payment, Holder


                                     2



<PAGE>







shall calculate the market value of the pledged stock (based upon the average of
the high and trading prices,  regular way, on the New York Stock Exchange on the
first business day after the date that payment was received).  To the extent, if
any, that the market value of the pledged  securities exceeds the amount owed by
the Maker on this note (the "Over Secured Amount"),  Holder will promptly return
to the Maker a number of shares of Pogo  Common  Stock  (rounded  to the nearest
whole share) equal to the Over Secured Amount;  provided,  however,  that Holder
will not be  required to deliver  shares to the Maker equal to the Over  Secured
Amount if, either prior to, or as a result of such delivery,  Holder would be in
violation of any rules or regulations of any governmental entity relating to the
extension  of credit that is secured by publicly  traded  securities  including,
without limitation, 12 C.F.R. Part 207, et seq.

      9.  Assignment.  This note and all rights and powers  hereunder,  together
with any property  securing it, may be transferred and assigned by the Holder at
such time and upon such  terms as the Holder may deem  advisable,  and  assignee
shall succeed to all the rights and powers of the Holder hereunder,  but only if
such  transferee  agrees in writing to be bound by the  provisions  set forth in
Section 8 hereof.

     10. Not Assumable. This note may not be assumed without the written consent
of the Holder.

     11.  Construction.  This note shall be governed by and construed  under the
laws of the State of Texas and the laws of the United States of America.




          [Remainder of This Page Has Been Intentionally Left Blank]


                                     3



<PAGE>







      IN WITNESS WHEREOF,  the  undersigned,  intending to be legally bound, has
executed this note on _____________ 1998.



                                          -------------------------------
                                          MAKER


Agreed to and accepted:

ARCH PETROLEUM INC.


- ------------------------
K. R. Good
Executive Vice President



                                     4



<PAGE>






                                 Schedule 2(a)

                               Payment Schedule

            Payment Date                        Amount Due

            December 31, 1998                   __________
            March 31, 1999                      __________
            June 30, 1999                       __________
            September 30, 1999                  __________
            December 31, 1999                   __________
            March 31, 2000                      __________
            June 30, 2000                       __________
            September 30, 2000                  __________
            December 31, 2000                   __________
            March 31, 2001                      __________
            June 30, 2001                       __________
            September 30, 2001                  __________



                                     5



<PAGE>




                                                                     EXHIBIT B
                                                       FORM OF RULE 145 LETTER



                                 May ___, 1998




Pogo Producing Company
South Greenway Plaza
Suite 2700
Houston, Texas 77046-0504

Attention:  K. R. Good


Gentlemen:

      The  undersigned,  a holder of shares of common stock, par value $0.01 per
share (the "Arch Common Stock"), of Arch Petroleum Inc., a Delaware  corporation
("Arch"),  has been advised that as of the date hereof,  the  undersigned may be
deemed to be an "affiliate" of Arch, as the term  "affiliate" is (i) defined for
purposes  of  paragraph  (c) and (d) of Rule 145  ("Rule  145") of the Rules and
Regulations  (the  "Rules  and  Regulations")  of the  Securities  and  Exchange
Commission (the "Commission")  under the Securities Act of 1933, as amended (the
"Securities  Act"),  and/or (ii) used in and for purposes of  Accounting  Series
Releases 130 and 135, as amended, of the Commission.

      The undersigned has been further advised that pursuant to the terms of the
Agreement and Plan of Merger dated as of May ___, 1998 (the "Merger  Agreement")
among Arch, Pogo Producing Company, a Delaware corporation ("Pogo"), and Alphac,
Inc., a Delaware  corporation and wholly owned  subsidiary of Pogo ("Sub"),  Sub
will be merged  with and into Arch  (the  "Merger")  and that as a result of the
Merger,  the undersigned will receive shares of Pogo Common Stock (as defined in
the Merger  Agreement)  in exchange for shares of Arch Common Stock owned by the
undersigned.

      1. The undersigned represents,  warrants and covenants to Pogo that in the
event the undersigned  receives any Pogo Common Stock as a result of the Merger,
the undersigned:








<PAGE>





Pogo Producing Company
May ___, 1998
Page 2



            A. Shall not make any sale,  transfer  or other  disposition  of the
      Pogo Common  Stock in  violation  of the  Securities  Act or the Rules and
      Regulations.

            B.  Has  read  carefully   this  letter  and  discussed   applicable
      limitations  upon the  ability of the  undersigned  to sell,  transfer  or
      otherwise dispose of the Pogo Common Stock acquired in connection with the
      Merger to the extent the  undersigned  believed  necessary with counsel of
      the undersigned or counsel for Arch.

            C. Has been  advised  that the  issuance of the Pogo Common Stock to
      the  undersigned  pursuant  to the  Merger  will be  registered  with  the
      Commission  under the Securities  Act on a Registration  Statement on Form
      S-4.  However,  the undersigned  has also been advised that,  since at the
      time the Merger will be submitted for a vote of the  stockholders of Arch,
      the  undersigned  may be  deemed to have been an  affiliate  of Arch,  the
      undersigned may not sell, transfer or otherwise dispose of the Pogo Common
      Stock  issued to the  undersigned  in the  Merger  unless  (i) such  sale,
      transfer or other  disposition  has been  registered  under the Securities
      Act, (ii) such sale,  transfer or other  disposition is made in conformity
      with the  volume  and other  limitations  of Rule 145  promulgated  by the
      Commission  under the  Securities  Act, or (iii) in the opinion of counsel
      reasonably acceptable to Pogo, such sale, transfer or other disposition is
      otherwise exempt from registration under the Securities Act.

            D.  Understands  that,  except  with  respect  to  the  Registration
      Statement on Form S-4 contemplated by the Merger Agreement,  Pogo is under
      no obligation to register the sale,  transfer or other  disposition of the
      Pogo Common Stock by the undersigned or on behalf of the undersigned under
      the  Securities  Act or, except as otherwise  provided  herein or by other
      agreement,  to take any other action necessary in order to make compliance
      with an exemption from such registration available.

            E. Also  understands  that,  in the event the  undersigned  does not
      comply with the  provisions of Rule 145 governing the transfer of the Pogo
      Common Stock  acquired in connection  with the Merger,  Pogo may give stop
      transfer  instructions  to Pogo's  transfer agent with respect to the Pogo
      Common Stock and that Pogo reserves the right to place on the certificates
      for the Pogo Common Stock issued to the undersigned,  or any substitutions
      therefor, a legend stating in substance:

      "The  securities  represented  by this  certificate  have been issued in a
      transaction to which Rule 145 promulgated under the Securities Act of 1933
      applies and may only be sold or otherwise  transferred in compliance  with
      the requirements of Rule 145 or







<PAGE>





Pogo Producing Company
May ___, 1998
Page 3



      pursuant to a registration  statement under  said Act or an exemption from
      such registration."

            F. Also  understands  that unless the transfer by the undersigned of
      Pogo  Common  Stock of the  undersigned  acquired in  connection  with the
      Merger has been  registered  under the Securities Act or is a sale made in
      conformity with the provisions of Rule 145, Pogo reserves the right to put
      the following  legend on the  certificates  issued to  transferees  of the
      undersigned:

      "The securities  represented by this  certificate have not been registered
      under  the  Securities  Act of 1933 and were  acquired  from a person  who
      received such shares in a transaction to which Rule 145 promulgated  under
      the Securities Act of 1933 applies.  The securities  have been acquired by
      the  holder  not with a view to, or for  resale in  connection  with,  any
      distribution  thereof within the meaning of Securities Act of 1933 and may
      not be sold, pledged or otherwise transferred except in accordance with an
      exemption  from the  registration  requirements  of the  Securities Act of
      1933."

            G. Execution of this letter should not be considered an admission on
      the part of the  undersigned  that the undersigned is an affiliate of Arch
      as described in the first paragraph of this letter, nor as a waiver of any
      rights  the  undersigned  may  have  to  object  to  any  claim  that  the
      undersigned is such an affiliate on or after the date of this letter.

      2. By Pogo's  acceptance  of this  letter,  Pogo  hereby  agrees  with the
undersigned as follows:

            A.  For so  long  as  and to the  extent  necessary  to  permit  the
      undersigned to sell the Pogo Common Stock pursuant to Rule 145 and, to the
      extent  applicable,  Rule 144 under the Act, Pogo shall use all reasonable
      efforts to (i) file, on a timely  basis,  all reports and data required to
      be  filed  with  the  Commission  by it  pursuant  to  Section  13 of  the
      Securities  Exchange Act of 1934, as amended (the  "Exchange  Act"),  (ii)
      promptly furnish to the undersigned upon request a written statement as to
      whether Pogo has complied with such reporting  requirements  during the 12
      months  preceding  any  proposed  sale of the  Pogo  Common  Stock  by the
      undersigned  under Rule 145, and (iii) permit such sales  pursuant to Rule
      145 and Rule 144. Pogo has filed all reports required to be filed with the
      Commission  under  Section 13 of the Exchange Act during the  preceding 12
      months.








<PAGE>





Pogo Producing Company
May ___, 1998
Page 4


            B. It is understood  and agreed that  certificates  with any legends
      set forth in paragraphs E and F above will be  substituted  by delivery of
      certificates  without  such  legend  if (i)  shares of Pogo  Common  Stock
      acquired in  connection  with the Merger are sold in  accordance  with the
      provisions  of  paragraphs  (c),  (e),  (f) and  (g) of  Rule  144 and the
      provisions of Rule 145(d)(i) are then available to the  undersigned,  (ii)
      one year shall have  elapsed  from the date the  undersigned  acquired the
      Pogo Common Stock in connection with the Merger and the provisions of Rule
      145(d)(2)  are then  available to the  undersigned,  (iii) two years shall
      have elapsed from the date the undersigned  acquired the Pogo Common Stock
      in connection  with the Merger and the  provisions  of Rule  145(d)(3) are
      then  applicable to the  undersigned,  or (iv) Pogo has received either an
      opinion  of  counsel,  which  opinion  and  counsel  shall  be  reasonably
      satisfactory to Pogo, or a "no-action"  letter obtained by the undersigned
      from the staff of the  Commission,  to the  effect  that the  restrictions
      imposed  by Rule 144 and Rule 145  under  the Act no  longer  apply to the
      undersigned.


                                          Very truly yours,







ACCEPTED THIS _____ DAY OF _________, 1998:

POGO PRODUCING COMPANY



By:
      K. R. Good
      Executive Vice President








<PAGE>




                                                                     EXHIBIT C
                                                   FORM OF AFFILIATE AGREEMENT


                            STOCKHOLDER AGREEMENT
                        (Directors/Executive Officers)

            This Stockholder  Agreement dated as of May __, 1998 is between Pogo
Producing  Company,  a  Delaware   corporation  ("Pogo")  and  [Insert  Name  of
Director/Officer]  (the  "Stockholder"),  an  individual  and  [title]  of  Arch
Petroleum Inc., a Delaware corporation ("Arch").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned  subsidiary of Pogo  ("Sub"),  and Arch are entering into an Agreement and
Plan of  Merger  dated as of the  date  hereof  (as  amended  from  time to time
pursuant thereto, the "Merger Agreement");

            WHEREAS,  the  Stockholder  is the  record and  beneficial  owner of
[insert number] shares of Common Stock,  par value $0.01 per share, of Arch (the
"Arch Common Stock") (such shares of Arch Common Stock, together with any shares
of capital stock of Arch acquired by the  Stockholder  after the date hereof and
during the term of this Agreement,  being collectively referred to herein as the
"Stockholder Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an  inducement  to it to do so, the  Stockholder  has
agreed for the benefit of Pogo as set forth in this Agreement;

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):

                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement thereof prior to the Voting


                                     1



<PAGE>



Termination  Date, or in connection with any written consent of the stockholders
of Arch given prior to the Voting  Termination  Date, the Stockholder shall vote
or cause to be voted  the  Stockholder  Shares in favor of the  approval  of the
Merger and each of the other  transactions  contemplated by the Merger Agreement
and in favor of the  approval  and  adoption  of the Merger  Agreement,  and any
actions required in furtherance  hereof and thereof.  The Stockholder  shall not
enter into any  agreement or  understanding  with any person prior to the Voting
Termination  Date,  directly  or  indirectly,  to vote,  grant any proxy or give
instructions with respect to the voting of the Stockholder  Shares in any manner
inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of his agents, affiliates or other representatives  (collectively,  "Stockholder
Representatives") to, directly or indirectly, solicit or encourage (including by
way of providing  information)  any  prospective  acquiror or the  invitation or
submission  of any  inquiries,  proposals  or  offers or any  other  efforts  or
attempts  that  constitute,  or may  reasonably  be  expected  to  lead  to,  an
Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e)  The  provisions  of  this  Section  1.03  do not  prohibit  any
Stockholder  Representative  who is  also  an Arch  Representative  from  taking
actions permitted by Section 4.2 of the Merger Agreement.


                                     2



<PAGE>




            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder Shares.

            Section 1.05. Other Actions.

            (a)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder Agreement,  the Stockholder will not sell or in any other way reduce
such  party's risk  relative to any  Stockholder  Shares,  shares of Pogo Common
Stock, or securities  convertible  into Pogo Common Stock  controlled,  owned or
held by such Stockholder prior to the Merger,  nor will it sell, or in any other
way reduce its risk  relative  to any shares of Pogo  Common  Stock  received in
exchange for the Stockholder Shares in the Merger (within the meaning of Section
201.01  of the  SEC's  Financial  Reporting  Release  No.  1) or any  securities
convertible  into  Pogo  Common  Stock,  until the  earlier  of (i) such time as
financial results (including combined sales and net income) covering at least 30
days of Pogo's post-merger  operations have been published,  except as permitted
by Staff Accounting Bulletin No. 76 (or any successor thereto) issued by the SEC
and (ii) 60 days  after  the first  full  calendar  month of Pogo's  post-merger
operations (the "Restricted Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, he shall
convert  all of the  Stockholder  Shares  controlled,  owned  or  held by him in
accordance with, and for the consideration described in, the Merger Agreement.

                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01.  Ownership.  Except as set forth on Schedule 2.01, the
Stockholder  is, as of the date hereof,  the  beneficial and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the  Stockholder  Shares.  None of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the  Stockholder  Shares,  and no proxy,  power of  attorney  or other
authorization has been granted with respect to any of the Stockholder Shares.



                                     3



<PAGE>



            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04.  Total  Shares.  The  Stockholder  Shares are the only
shares of capital stock of Arch owned  beneficially  or of record as of the date
hereof  by the  Stockholder,  and the  Stockholder  does not have any  option to
purchase or right to subscribe for or otherwise  acquire any  securities of Arch
and has no  other  interest  in or  voting  rights  with  respect  to any  other
securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06. Reasonable Efforts. Prior to the Termination Date, the
Stockholder  shall,  solely  in his  capacity  as a  stockholder  of  Arch,  use
reasonable  efforts to take,  or cause to be taken,  all actions,  and to do, or
cause to be done,  and to assist and  cooperate  with Pogo in doing,  all things
necessary,  proper or advisable to consummate  and make effective the Merger and
the other transactions contemplated by the Merger Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.



                                     4



<PAGE>



            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.

                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to preparing for entering into and carrying out this  Agreement and the
consummation of the transactions  contemplated hereby;  provided,  however, that
Arch may pay such expenses of the Stockholder.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further action as may be necessary or desirable to consummate  the  transactions
contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform his  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:



                                     5



<PAGE>



      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

      with a copy to:

            Robert Stillwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            [Insert name]
            [Insert address]

            Facsimile: [Insert fax no.]

      with a copy to:

            --------------------------
            --------------------------
            Attention: ---------------
            Facsimile: ---------------

     Section 4.05. Interpretation. When a reference is made in this Agreement to
Sections,  such  reference  shall  be to a  Section  of  this  Agreement  unless
otherwise indicated.  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. Whenever the words "include," "includes" or "including" are used
in this  Agreement,  they shall be deemed to be followed  by the words  "without
limitation." Unless the context otherwise requires,  "or" is disjunctive but not
necessarily  exclusive,  and words in the singular include the plural and in the
plural include the singular.  The term "person" is to be interpreted  broadly to
include any  individual,  corporation,  partnership,  trust,  limited  liability
company,  government  or other  entity  and any group (as used with  respect  to
Section 13(d) of the Securities Exchange Act of 1934, as amended).

     Section 4.06.  Counterparts.  This Agreement may be executed in two or more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become


                                     6



<PAGE>



effective  when a  counterpart  has  been  signed  by  each of the  parties  and
delivered to the other party, it being understood that all parties need not sign
the same counterpart.

     Section  4.07.  Entire  Agreement;  No  Third  Party  Beneficiaries.   This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

     Section 4.08. Governing Law. This Agreement shall be governed and construed
in accordance  with the laws of the State of Delaware,  without giving effect to
the principles of conflicts of law thereof.

     Section  4.09.  Assignment.  Neither this  Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
hereto  (whether by operation  of law or  otherwise)  without the prior  written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective successors and assigns.

     Section 4.10. Amendments;  Termination. This Agreement may not be modified,
amended,  altered or  supplemented,  except upon the execution and delivery of a
written agreement executed by the parties hereto. This Agreement shall terminate
upon the  termination  of the  Merger  Agreement  in  accordance  with the terms
thereof.

     Section 4.11.  Certain Events.  The Stockholder  agrees that this Agreement
and  the  obligations   hereunder   shall  attach  to  the  Stockholder   Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

     Section 4.12. Severability. Whenever possible, each provision or portion of
any  provision of this  Agreement  will be  interpreted  in such manner as to be
effective  and valid but if any  provision  or portion of any  provision of this
agreement is held to be invalid,  illegal or unenforceable in any respect,  such
invalidity,  illegality or unenforceability  will not affect any other provision
or portion of any provision, and this Agreement will be reformed,  construed and
enforced as if such invalid,  illegal or  unenforceable  provision or portion of
any provision had never been  contained  herein.  The parties shall  endeavor in
good  faith  negotiations  to replace  any  invalid,  illegal  or  unenforceable
provision with a valid  provision the effects of which come as close as possible
to those of such invalid, illegal or unenforceable provision.

     Section  4.13.  Attorneys'  Fees.  If any  action  at law or in  equity  is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.



                                     7



<PAGE>


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




                                    [Stockholder]


                                    POGO PRODUCING COMPANY



                                    By
                                          Gerald A. Morton
                                          Vice President-Law
                                          and Corporate Secretary


                                     8



<PAGE>




                                                                     EXHIBIT D
                                               FORM OF RESIGNATION AND RELEASE


                            RESIGNATION AND RELEASE

      In connection with the  performance of that certain  Agreement and Plan of
Merger (the "Merger  Agreement")  dated as of May ___,  1998,  by and among Pogo
Producing Company, a Delaware  corporation  ("Pogo"),  Alphac,  Inc., a Delaware
corporation  and a direct  wholly owned  subsidiary  of Pogo  ("Sub"),  and Arch
Petroleum Inc., a Delaware corporation  ("Arch"),  the undersigned hereby agrees
to tender his resignation from Arch,  including the positions he currently holds
with  Arch at the  Effective  Time  (as  such  term  is  defined  in the  Merger
Agreement).

      Concurrent  with such  resignation,  the  undersigned,  for  himself,  his
attorneys, heirs, executors, administrators,  successors and assigns does hereby
release,  acquit,  and  forever  discharge  Arch,  Sub and Pogo from any and all
liabilities,  obligations, promises, agreements, rights, demands, costs, losses,
debts and expenses (including  attorneys fees and costs actually  incurred),  of
any nature whatsoever, known or unknown, which the undersigned now has, owns, or
holds,  or claims to have, own, or hold, or which he at any time heretofore had,
owned or held,  or claimed to have had,  owned or held,  or which he at any time
hereafter may have, own, or hold, or claim to have,  own, or hold,  against each
or any of Arch, Pogo or their affiliates,  assigns or successors  (collectively,
the "Responsible Parties"), arising under or related to his employment with Arch
or under that certain Employment Agreement,  dated as of ____________,  ____, by
and between Arch and the  undersigned,  as amended by that certain  Amendment to
Employment Contract dated _________ (as so amended, the "Employment Agreement"),
including without limitation claims for compensation, except (i) with respect to
the  obligations  under  the  severance  provisions  of  Paragraph  3.2(a)  (the
"Severance   Obligations")   of  the   Employment   Agreement   and   (ii)   for
indemnification obligations owed by Arch and/or Pogo to the undersigned pursuant
to the Merger  Agreement,  the Certificate of  Incorporation of Arch or Delaware
law; provided,  however,  that this Resignation and Release shall be conditioned
upon, and shall be revocable in the event that the Responsible Parties,  jointly
or severally, fail to fulfill the Severance Obligations.

      This Resignation and Release shall be governed and construed in accordance
with the laws of the State of Delaware,  without giving effect to the principles
of conflicts of law thereof. This Resignation and Release may be executed in two
or more  counterparts,  all of  which  shall  be  considered  one  and the  same
agreement and shall become  effective  when two or more  counterparts  have been
signed  by each of the  parties  and  delivered  to the  other  party,  it being
understood that all parties need not sign the same counterpart. This Resignation
and Release may not be modified,  amended, altered or supplemented,  except upon
the  execution  and  delivery  of a written  agreement  executed  by the parties
hereto.  If any action at law or in equity is  necessary to enforce or interpret
the  terms  of this  agreement,  the  prevailing  party  shall  be  entitled  to
reasonable  attorneys' fees, costs and necessary  disbursements,  in addition to
any other relief to which such party may be entitled.



                                  1




<PAGE>








      Executed to be effective as of the ____ day of May, 1998.



                                  [INSERT NAME]


ACCEPTED THIS ____ DAY OF MAY, 1998:

ARCH PETROLEUM INC.


By:
Name:
Title:

POGO PRODUCING COMPANY


By:
Name:
Title:




                                                                   EXHIBIT 2.2

                            STOCKHOLDER AGREEMENT
                   (The Travelers Life and Annuity Company)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo Producing Company, a Delaware  corporation ("Pogo") and The
Travelers   Life  and  Annuity   Company,   a   Connecticut   corporation   (the
"Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS,  the  Stockholder  is  the  beneficial  owner  of  $300,000
principal  amount of the Arch's 9.75%  Convertible  Subordinated  Notes due 2004
(the  "Series A Notes"),  and  $2,700,000  of Arch's  Adjustable  Rate  Series B
Subordinated  Notes due 2004 (the  "Series B Notes" and,  collectively  with the
Series A Notes,  the "Notes")  (any shares of Arch capital stock into which such
Notes are convertible  (after such  conversion) and such other shares of capital
stock of Arch acquired by the  Stockholder  after the date hereof and during the
term  of  this  Agreement,   being  collectively   referred  to  herein  as  the
"Stockholder Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo;

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement  thereof prior to the Voting Termination Date, or in
connection with any written  consent of the  stockholders of Arch given prior to
the Voting Termination Date, the Stockholder shall vote or cause to be voted the
Stockholder Shares (if, and to the extent that, any are owned by the Stockholder
at the applicable



                                      1

<PAGE>



record  date) in favor  of the  approval  of the  Merger  and each of the  other
transactions  contemplated by the Merger  Agreement and in favor of the approval
and adoption of the Merger  Agreement,  and any actions  required in furtherance
hereof  and  thereof.  The  Stockholder  shall not enter into any  agreement  or
understanding with any person prior to the Voting Termination Date,  directly or
indirectly,  to vote, grant any proxy or give  instructions  with respect to the
voting of the  Stockholder  Shares (if any are owned by the  Stockholder  at the
applicable record date) in any manner inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the  Stockholder  Shares (if any are owned by the  Stockholder)  or enter
into a voting agreement with respect to any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers,  directors,  employees,  partners,  agents, affiliates or other
representatives  (collectively,  "Stockholder  Representatives") to, directly or
indirectly, solicit or encourage (including by way of providing information) any
prospective acquiror or the invitation or submission of any inquiries, proposals
or offers or any other efforts or attempts that constitute, or may reasonably be
expected to lead to, an Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also an Arch  Representative from taking actions permitted by Section 4.2
of the Merger Agreement.




                                      2

<PAGE>



            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder Shares;  except transfers to affiliates of the
Stockholder if such persons agree in writing to be bound by the terms hereof and
provided  further,  that such transfer does not, in the opinion of a tax advisor
reasonably acceptable to Pogo, violate the terms of Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement,  but prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to any  Stockholder  Shares,  Notes,  shares of Pogo Common Stock, or securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period")

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert the Notes owned by it into such number of shares of Pogo Common Stock as
is equal to (i) the unpaid  principal amount of such Notes divided by (ii) $2.75
per share of Arch Common Stock, multiplied by (ii) the Common Exchange Ratio. In
addition,  the  Stockholder  agrees  to  accept  cash in lieu of any  fractional
interest  that it would  otherwise  be entitled  to  pursuant  to the  foregoing
conversion,  calculated in the manner set forth in the Merger Agreement.  To the
extent  that the  agreement  set  forth in the  immediately  preceding  sentence
requires an amendment to the Notes,  the Notes shall be deemed amended as of the
Effective Time to reflect such changes.  The conversion price for the Notes will
also be subject,  if applicable,  as described in Section 11.3 of the Securities
Purchase  Agreement,  dated as of October 15, 1994, by and between the holder of
such  Note and Arch (the  "Securities  Purchase  Agreement")  as a result of any
events  that occur  because of actions  taken by Arch or Pogo from and after the
date of this Agreement.

            (d) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert all of the Stockholder Shares controlled,  owned, or held by it, if any,
in  accordance  with,  and  for  the  consideration  described  in,  the  Merger
Agreement.





                                      3

<PAGE>



                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date hereof,  the  Stockholder  is the beneficial  owner of the  Stockholder
Shares,  the Stockholder  has the sole right to vote the Stockholder  Shares and
there are no  restrictions  on  rights of  disposition  or other  lien,  pledge,
security interest,  charge or other encumbrance or restriction pertaining to the
Stockholder  Shares.  None of the  Stockholder  Shares is  subject to any voting
trust or other agreement,  arrangement or restriction with respect to the voting
of  the  Stockholder   Shares,   and  no  proxy,  power  of  attorney  or  other
authorization has been granted with respect to any of the Stockholder Shares.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
corporation  duly  incorporated and validly existing under the laws of the State
of Connecticut.  The Stockholder has all requisite corporate power and authority
to enter into this Agreement and perform its obligations hereunder. Such actions
by the  Stockholder  (a) require no action by or in respect of, or filing  with,
any Governmental Entity with respect to the Stockholder, other than any required
filings  under  Section 13 of the  Exchange Act or under the HSR Act, and (b) do
not and will not  contravene  or  constitute  a default  under any  provision of
applicable  law or regulation or any  agreement,  judgment,  injunction,  order,
decree  or  other  instrument  binding  on  the  Stockholder  or  result  in the
imposition of any lien, pledge,  security interest,  charge or other encumbrance
or restriction on any of the Stockholder  Shares (other than as provided in this
Agreement with respect to Stockholder Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04. Total Shares.  As of the date hereof,  the Stockholder
does not own,  beneficially or of record,  any shares of Arch capital stock and,
except for its right to acquire Arch Common Stock upon  conversion of the Notes,
the  Stockholder  does not have any option to purchase or right to subscribe for
or  otherwise  acquire any  securities  of Arch and has no other  interest in or
voting rights with respect to any other securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.




                                      4

<PAGE>



            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.


                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to preparing for  entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further action as may be necessary or desirable to consummate  the  transactions
contemplated by this Agreement.



                                      5

<PAGE>




            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

      with a copy to:

            Robert Stilwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            The Travelers Life and Annuity Company
            One Tower Square
            Hartford, CT 06183-2030
            Attention: Securities Department - Private Placements
            Facsimile: 860-954-3730




                                      6

<PAGE>



      with a copy to:

            The Travelers Life and Annuity Company
            One Tower Square
            Hartford, CT 06183-2030
            Attention: Daniel B. Kenney
            Facsimile: 860-954-3730

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).

            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when a  counterpart  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

            Section  4.08. Governing Law.  This Agreement shall  be governed and
construed in  accordance with the laws of the  State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether  by  operation  of law  or  otherwise)  except  to the
affiliates  of the  Stockholder  as permitted  herein  without the prior written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective  successors and assigns. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

            Section 4.10.  Amendments; Termination.  This  Agreement may  not be
modified,  amended,  altered or supplemented,  except  upon  the  execution  and
delivery of a written  agreement executed by the parties hereto.  This Agreement
shall terminate upon the termination  of the Merger Agreement in accordance with
the terms thereof.  This Agreement may be



                                      7

<PAGE>



terminated by  Stockholder  if (i) the Effective Time fails to occur by November
30, 1998 (provided that the right to terminate this Agreement  under this clause
(i) shall not be  available  to  Stockholder  if the failure by  Stockholder  to
fulfill any covenant or agreement  under this Agreement has been the cause of or
resulted in the failure of the Merger to occur on or before such date; provided,
further,  that  if the  failure  of the  Effective  Time  to  have  occurred  is
attributable to any court of competent jurisdiction,  or some other governmental
body or regulatory  authority having issued an order,  decree or ruling or taken
any other action temporarily restraining, enjoining or otherwise prohibiting the
Merger,  then the  Stockholder's  right to terminate this  Agreement  under this
clause (i) shall not be exercisable  until the earlier of (x) one day after such
order,  decree or ruling has been  dissolved or (y) February 28, 1999);  or (ii)
sections  2.1(b),  2.1(c),  2.1(d),  2.3(a),  5.6,  5.18 or 6.1(b) of the Merger
Agreement are amended or waived without the consent of Stockholder.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.

        [The Remainder of This Page Has Been Intentionally Left Blank]





                                      8

<PAGE>



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


                                    THE TRAVELERS LIFE AND
                                         ANNUITY COMPANY



                                    By    /s/ John F. Gilsenan
                                          John F. Gilsenan
                                          Second Vice President



                                    POGO PRODUCING COMPANY



                                    By    /s/ Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary





                                      9

<PAGE>


                                 Schedule 2.01

1.    None.



                                      10


                                                                   EXHIBIT 2.3

                            STOCKHOLDER AGREEMENT
                       (The Travelers Indemnity Company)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo Producing Company, a Connecticut  corporation  ("Pogo") and
The Travelers Indemnity Company, a Connecticut corporation (the "Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS,  the Stockholder is the beneficial  owner of 436,364 shares
of Exchangeable  Convertible Preferred Stock, par value $0.01 per share, of Arch
(the "Arch Preferred Stock") (such shares of Arch Preferred Stock, together with
any shares of capital stock of Arch acquired by the  Stockholder  after the date
hereof and during the term of this Agreement,  whether by conversion of the Arch
Preferred   Stock,   conversion  of  convertible   debt,  or  otherwise,   being
collectively referred to herein as the "Stockholder Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo;

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement  thereof prior to the Voting Termination Date, or in
connection with any written  consent of the  stockholders of Arch given prior to
the Voting Termination Date, the Stockholder shall vote or cause to be voted the
Stockholder  Shares in favor of the approval of the Merger and each of the other
transactions  contemplated by the Merger  Agreement and in favor of the approval
and adoption of the Merger



                                      1

<PAGE>



Agreement,  and any actions  required in  furtherance  hereof and  thereof.  The
Stockholder shall not enter into any agreement or understanding  with any person
prior to the Voting Termination Date, directly or indirectly, to vote, grant any
proxy or give instructions with respect to the voting of the Stockholder  Shares
in any manner inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers,  directors,  employees,  partners,  agents, affiliates or other
representatives  (collectively,  "Stockholder  Representatives") to, directly or
indirectly, solicit or encourage (including by way of providing information) any
prospective acquiror or the invitation or submission of any inquiries, proposals
or offers or any other efforts or attempts that constitute, or may reasonably be
expected to lead to, an Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also an Arch  Representative from taking actions permitted by Section 4.2
of the Merger Agreement.

            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder Shares;  except transfers to affiliates of the
Stockholder if such persons agree in writing to be bound by



                                      2

<PAGE>



the terms  hereof and  provided  further,  that such  transfer  does not, in the
opinion of a tax advisor  reasonably  acceptable  to Pogo,  violate the terms of
Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement,  but prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to  any  Stockholder  Shares,   shares  of  Pogo  Common  Stock,  or  securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert  all of the  Stockholder  Shares  controlled,  owned,  or  held by it in
accordance with, and for the consideration described in, the Merger Agreement.


                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date hereof,  the Stockholder is the beneficial  owner of the Arch Preferred
Stock,  the  Stockholder has the sole right to vote the Arch Preferred Stock and
there are no  restrictions  on  rights of  disposition  or other  lien,  pledge,
security interest,  charge or other encumbrance or restriction pertaining to the
Arch Preferred Stock.  None of the Arch Preferred Stock is subject to any voting
trust or other agreement,  arrangement or restriction with respect to the voting
of  the  Arch  Preferred  Stock,  and no  proxy,  power  of  attorney  or  other
authorization has been granted with respect to any of the Arch Preferred Stock.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
corporation  duly organized and validly existing  under the laws of the State of
Connecticut. The Stockholder



                                      3

<PAGE>



has all requisite corporate power and authority to enter into this Agreement and
perform its obligations  hereunder.  Such actions by the Stockholder (a) require
no action by or in respect  of, or filing  with,  any  Governmental  Entity with
respect to the Stockholder,  other than any required filings under Section 13 of
the Exchange Act or under the HSR Act, and (b) do not and will not contravene or
constitute a default under any provision of applicable  law or regulation or any
agreement,  judgment,  injunction,  order, decree or other instrument binding on
the  Stockholder  or result in the  imposition  of any  lien,  pledge,  security
interest,  charge or other  encumbrance or restriction on any of the Stockholder
Shares  (other than as provided in this  Agreement  with respect to  Stockholder
Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04.  Total Shares.  The 436,364  shares of Arch  Preferred
Stock are the only  shares of  capital  stock of Arch owned  beneficially  or of
record as of the date hereof by the  Stockholder,  and the Stockholder  does not
have any option to purchase or right to subscribe  for or otherwise  acquire any
securities of Arch and has no other interest in or voting rights with respect to
any other securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.




                                      4

<PAGE>



            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.


                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to  preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further action as may be necessary or desirable to consummate  the  transactions
contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section 4.04.  Notices.   Any notice or  communication  required  or
permitted  hereunder  shall  be  in  writing  and  either  delivered personally,
telegraphed or  telecopied or  sent by  certified  or  registered  mail, postage
prepaid, and shall be deemed to be given, dated and



                                      5

<PAGE>



received when so delivered personally,  telegraphed or telecopied or, if mailed,
five  business  days  after the date of  mailing  to the  following  address  or
telecopy  number,  or to such other  address  or  addresses  as such  person may
subsequently designate by notice given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

      with a copy to:

            Robert Stilwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            The Travelers Indemnity Company
            One Tower Square
            Hartford, CT 06183-2030
            Attention: Securities Department - Private Placements
            Facsimile: 860-954-3730

      with a copy to:

            The Travelers Indemnity Company
            One Tower Square
            Hartford, CT 06183-2030
            Attention: Daniel B. Kenney
            Facsimile: 860-954-3730

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).



                                      6

<PAGE>




            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when a  counterpart  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

            Section 4.08. Governing Law.  This Agreement  shall  be governed and
construed  in accordance with  the laws of the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether  by  operation  of law  or  otherwise)  except  to the
affiliates  of the  Stockholder  as permitted  herein  without the prior written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective  successors and assigns. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

            Section 4.10.  Amendments;  Termination.  This  Agreement may not be
modified,  amended,  altered or  supplemented,  except  upon the  execution  and
delivery of a written agreement  executed by the parties hereto.  This Agreement
shall terminate upon the termination of the Merger  Agreement in accordance with
the terms  thereof.  This  Agreement may be terminated by Stockholder if (i) the
Effective  Time fails to occur by November 30, 1998  (provided that the right to
terminate  this  Agreement  under  this  clause  (i) shall not be  available  to
Stockholder  if the failure by  Stockholder to fulfill any covenant or agreement
under this  Agreement  has been the cause of or  resulted  in the failure of the
Merger to occur on or before such date; provided,  further,  that if the failure
of the Effective Time to have occurred is attributable to any court of competent
jurisdiction,  or some other  governmental  body or regulatory  authority having
issued an  order,  decree  or  ruling  or taken  any  other  action  temporarily
restraining,   enjoining  or  otherwise   prohibiting   the  Merger,   then  the
Stockholder's  right to terminate this Agreement under this clause (i) shall not
be  exercisable  until the  earlier of (x) one day after such  order,  decree or
ruling has been  dissolved or (y) February 28, 1999);  or (ii) sections  2.1(b),
2.1(c),  2.1(d), 2.3(a), 5.6, 5.18 or 6.1(b) of the Merger Agreement are amended
or waived without the consent of Stockholder.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.




                                      7

<PAGE>



            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.

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


                         THE TRAVELERS INDEMNITY COMPANY



                                    By    /s/ John F. Gilsenan
                                          John F. Gilsenan
                                          Second Vice President


                                    POGO PRODUCING COMPANY



                                    By    /s/ Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary





                                      8

<PAGE>


                                 Schedule 2.01

1.    None.



                                      9




                                                                   EXHIBIT 2.4

                            STOCKHOLDER AGREEMENT
                 (Connecticut General Life Insurance Company)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo  Producing  Company,  a Delaware  corporation  ("Pogo") and
Connecticut  General Life Insurance  Company, a life insurance company organized
under the laws of the State of Connecticut (the "Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS,  the Stockholder is the beneficial owner of 39,829.5 shares
of Exchangeable  Convertible Preferred Stock, par value $0.01 per share, of Arch
(the "Arch  Preferred  Stock"),  $27,373  principal  amount of the Arch's  9.75%
Convertible  Subordinated Notes due 2004 (the "Series A Notes"), and $246,361 of
Arch's  Adjustable  Rate  Series B  Subordinated  Notes due 2004 (the  "Series B
Notes" and,  collectively  with the Series A Notes, the "Notes") (such shares of
Preferred  Common  Stock,  together  with any  shares of  capital  stock of Arch
acquired  by the  Stockholder  after the date hereof and during the term of this
Agreement,  whether by conversion of the Arch Preferred Stock, conversion of the
Notes, or otherwise,  being collectively  referred to herein as the "Stockholder
Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo.

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement thereof prior to the Voting



                                      1

<PAGE>



Termination  Date, or in connection with any written consent of the stockholders
of Arch given prior to the Voting  Termination  Date, the Stockholder shall vote
or cause to be voted  the  Stockholder  Shares in favor of the  approval  of the
Merger and each of the other  transactions  contemplated by the Merger Agreement
and in favor of the  approval  and  adoption  of the Merger  Agreement,  and any
actions required in furtherance  hereof and thereof.  The Stockholder  shall not
enter into any  agreement or  understanding  with any person prior to the Voting
Termination  Date,  directly  or  indirectly,  to vote,  grant any proxy or give
instructions with respect to the voting of the Stockholder  Shares in any manner
inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers, directors, employees, general partners, agents, affiliates over
which  it has  control  or  other  representatives  (collectively,  "Stockholder
Representatives") to, directly or indirectly, solicit or encourage (including by
way of providing  information)  any  prospective  acquiror or the  invitation or
submission  of any  inquiries,  proposals  or  offers or any  other  efforts  or
attempts  that  constitute,  or may  reasonably  be  expected  to  lead  to,  an
Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also an Arch  Representative from taking actions permitted by Section 4.2
of the Merger Agreement.




                                      2

<PAGE>



            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder  Shares;  except dividends or distributions to
the stockholders of the Stockholder if such persons agree in writing to be bound
by the terms hereof and provided  further,  that such  transfer does not, in the
opinion of a tax advisor  reasonably  acceptable  to Pogo,  violate the terms of
Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a) Prior to the  termination of this  Stockholders  Agreement,  the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement  but  prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to any  Stockholder  Shares,  Notes,  shares of Pogo Common Stock, or securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period");  provided,  however, that the provisions of this Section 1.05(b) shall
not apply with  respect to  Stockholder  Shares and shares of Pogo Common  Stock
held in  separate  accounts  of  Stockholder  for which the  management  of such
securities  is  performed by outside  portfolio  managers  not  affiliated  with
Stockholder.

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert the Notes owned by it into such number of shares of Pogo Common Stock as
is equal to (i) the unpaid  principal amount of such Notes divided by (ii) $2.75
per share of Arch Common Stock, multiplied by (ii) the Common Exchange Ratio. In
addition,  the  Stockholder  agrees  to  accept  cash in lieu of any  fractional
interest  that it would  otherwise  be entitled  to  pursuant  to the  foregoing
conversion,  calculated in the manner set forth in the Merger Agreement.  To the
extent  that the  agreement  set  forth in the  immediately  preceding  sentence
requires an amendment to the Notes,  the Notes shall be deemed amended as of the
Effective Time to reflect such changes.  The conversion price for the Notes will
also be subject,  if applicable,  as described in Section 11.3 of the Securities
Purchase  Agreement,  dated as of October 15, 1994, by and between the holder of
such  Note and Arch (the  "Securities  Purchase  Agreement")  as a result of any
events  that occur  because of actions  taken by Arch or Pogo from and after the
date of this Agreement.




                                      3

<PAGE>



            (d) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert  all of the  Stockholder  Shares  controlled  owned,  or  held  by it in
accordance with, and for the consideration described in, the Merger Agreement.


                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date  hereof,  the  Stockholder  is the  beneficial  and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the  Stockholder  Shares.  None of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the  Stockholder  Shares,  and no proxy,  power of  attorney  or other
authorization has been granted with respect to any of the Stockholder Shares.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
life insurance company duly organized and validly existing under the laws of the
State of Connecticut.  CIGNA  Investments,  Inc.  ("CII") as authorized agent on
behalf of the  Stockholder  has all requisite  power and authority to enter into
this Agreement on behalf of Stockholder  and perform  Stockholder's  obligations
hereunder.  Such  actions  by the  Stockholder  (a)  require  no action by or in
respect  of, or  filing  with,  any  Governmental  Entity  with  respect  to the
Stockholder,  other than any required  filings  under Section 13 of the Exchange
Act or under the HSR Act, and (b) do not and will not contravene or constitute a
default under any provision of  applicable  law or regulation or any  agreement,
judgment,   injunction,  order,  decree  or  other  instrument  binding  on  the
Stockholder or result in the imposition of any lien, pledge,  security interest,
charge or other  encumbrance  or restriction  on any of the  Stockholder  Shares
(other than as provided in this Agreement with respect to Stockholder Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by CII, as authorized  agent on behalf of the  Stockholder  and is
the valid and binding  agreement  of the  Stockholder,  enforceable  against the
Stockholder in accordance  with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section 2.04.  Total Shares.  The 39,829.5  shares of Arch Preferred
Stock are the only  shares of  capital  stock of Arch owned  beneficially  or of
record as of the date hereof by the  Stockholder,  and the Stockholder  does not
have any option to purchase or right to subscribe  for or otherwise  acquire any
securities  of Arch  other  than upon  conversion  of the Notes and has no other
interest in or voting rights with respect to any other securities of Arch.



                                      4

<PAGE>




            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.


                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to  preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.




                                      5

<PAGE>



            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further  action as may be necessary or reasonably  desirable to  consummate  the
transactions contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

            with a copy to:

            Robert Stilwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522




                                      6

<PAGE>



      (b)   if to Stockholder, to:

            Connecticut General Life Insurance Company
            c/o CIGNA Investments, Inc.
            900 Cottage Grove Road, S-307
            Hartford, CT 06152-2307
            Attention: Thomas P. Shea, Private Securities Division (S-307)
            Facsimile: 860-726-7203

            with an additional copy to:

            William M. Duncan
            CIGNA Corporation
            900 Cottage Grove Road, S-215
            Hartford, CT  06152-2215
            Facsimile: 860-726-8885

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).

            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when a  counterpart  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto, any rights or remedies hereunder.

            Section 4.08. Governing  Law.  This Agreement shall  be governed and
construed  in accordance with  the laws of the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section 4.09. Assignment.   Neither  this Agreement  nor any  of the
rights,  interests  or obligations  hereunder  shall be  assigned  by any of the
parties  hereto (whether by  operation of law or otherwise) except to the stock-
holders of the Stockholder as permitted herein without the



                                      7

<PAGE>



prior written  consent of the other party.  Subject to the  preceding  sentence,
this Agreement will be binding upon,  inure to the benefit of and be enforceable
by the  parties  and their  respective  successors  and  assigns.  All costs and
expenses  incurred in connection  with this Agreement shall be paid by the party
incurring such cost or expense.

            Section 4.10.  Amendments;  Termination.  This  Agreement may not be
modified,  amended,  altered or  supplemented,  except  upon the  execution  and
delivery of a written agreement  executed by the parties hereto.  This Agreement
shall terminate upon the termination of the Merger  Agreement in accordance with
the terms  thereof.  This  Agreement may be terminated by Stockholder if (i) the
Effective  Time fails to occur by November 30, 1998  (provided that the right to
terminate  this  Agreement  under  this  clause  (i) shall not be  available  to
Stockholder  if the failure by  Stockholder to fulfill any covenant or agreement
under this  Agreement  has been the cause of or  resulted  in the failure of the
Merger to occur on or before such date; provided,  further,  that if the failure
of the Effective Time to have occurred is attributable to any court of competent
jurisdiction,  or some other  governmental  body or regulatory  authority having
issued an  order,  decree  or  ruling  or taken  any  other  action  temporarily
restraining,   enjoining  or  otherwise   prohibiting   the  Merger,   then  the
Stockholder's  right to terminate this Agreement under this clause (i) shall not
be  exercisable  until the  earlier of (x) one day after such  order,  decree or
ruling has been  dissolved or (y) February 28, 1999);  or (ii) sections  2.1(b),
2.1(c),  2.1(d), 2.3(a), 5.6, 5.18 or 6.1(b) of the Merger Agreement are amended
or waived without the consent of Stockholder.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.


         [The Remainder of This Page Has Been Intentionally Left Blank]




                                      8

<PAGE>




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


                                    CONNECTICUT GENERAL LIFE
                                        INSURANCE COMPANY

                                    By: CIGNA Investments, Inc.,
                                        its authorized agent


                                          By    /s/ Thomas P. Shea
                                                Thomas P. Shea
                                                Vice President


                                    POGO PRODUCING COMPANY


                                    By    /s/ Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary





                                      9

<PAGE>


                                 Schedule 2.01

1.    None.



                                      10



                                                                   EXHIBIT 2.5

                            STOCKHOLDER AGREEMENT
                     (CIGNA Mezzanine Partners III, L.P.)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo  Producing  Company,  a Delaware  corporation  ("Pogo") and
CIGNA Mezzanine  Partners III, L.P., a limited  partnership  organized under the
laws of the State Delaware (the "Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS, the Stockholder is the beneficial owner of 187,454.5 shares
of Exchangeable  Convertible Preferred Stock, par value $0.01 per share, of Arch
(the "Arch  Preferred  Stock"),  $128,900  principal  amount of the Arch's 9.75%
Convertible  Subordinated Notes due 2004 (the "Series A Notes"),  and $1,160,100
of Arch's  Adjustable  Rate Series B Subordinated  Notes due 2004 (the "Series B
Notes" and,  collectively  with the Series A Notes, the "Notes") (such shares of
Preferred  Common  Stock,  together  with any  shares of  capital  stock of Arch
acquired  by the  Stockholder  after the date hereof and during the term of this
Agreement,  whether by conversion of the Arch Preferred Stock, conversion of the
Notes, or otherwise,  being collectively  referred to herein as the "Stockholder
Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo.


            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (I) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting Termination Date"),



                                      1

<PAGE>



however called,  and at every  adjournment or postponement  thereof prior to the
Voting  Termination  Date,  or in  connection  with any  written  consent of the
stockholders of Arch given prior to the Voting Termination Date, the Stockholder
shall vote or cause to be voted the Stockholder  Shares in favor of the approval
of the  Merger  and each of the other  transactions  contemplated  by the Merger
Agreement and in favor of the approval and adoption of the Merger Agreement, and
any actions required in furtherance  hereof and thereof.  The Stockholder  shall
not enter into any  agreement  or  understanding  with any  person  prior to the
Voting  Termination  Date,  directly or indirectly,  to vote, grant any proxy or
give  instructions  with respect to the voting of the Stockholder  Shares in any
manner inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers, directors, employees, general partners, agents, affiliates over
which  it has  control  or  other  representatives  (collectively,  "Stockholder
Representatives") to, directly or indirectly, solicit or encourage (including by
way of providing  information)  any  prospective  acquiror or the  invitation or
submission  of any  inquiries,  proposals  or  offers or any  other  efforts  or
attempts  that  constitute,  or may  reasonably  be  expected  to  lead  to,  an
Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also an Arch  Representative from taking actions permitted by Section 4.2
of the Merger Agreement.



                                      2

<PAGE>




            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder  Shares;  except dividends or distributions to
the stockholders of the Stockholder if such persons agree in writing to be bound
by the terms hereof and provided  further,  that such  transfer does not, in the
opinion of a tax advisor  reasonably  acceptable  to Pogo,  violate the terms of
Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a) Prior to the  termination of this  Stockholders  Agreement,  the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement  but  prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to any  Stockholder  Shares,  Notes,  shares of Pogo Common Stock, or securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert the Notes owned by it into such number of shares of Pogo Common Stock as
is equal to (i) the unpaid  principal amount of such Notes divided by (ii) $2.75
per share of Arch Common Stock, multiplied by (ii) the Common Exchange Ratio. In
addition,  the  Stockholder  agrees  to  accept  cash in lieu of any  fractional
interest  that it would  otherwise  be entitled  to  pursuant  to the  foregoing
conversion,  calculated in the manner set forth in the Merger Agreement.  To the
extent  that the  agreement  set  forth in the  immediately  preceding  sentence
requires an amendment to the Notes,  the Notes shall be deemed amended as of the
Effective Time to reflect such changes.  The conversion price for the Notes will
also be subject,  if applicable,  as described in Section 11.3 of the Securities
Purchase  Agreement,  dated as of October 15, 1994, by and between the holder of
such  Note and Arch (the  "Securities  Purchase  Agreement")  as a result of any
events  that occur  because of actions  taken by Arch or Pogo from and after the
date of this Agreement.

            (d) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert  all of the  Stockholder  Shares  controlled  owned,  or  held  by it in
accordance with, and for the consideration described in, the Merger Agreement.




                                      3

<PAGE>




                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date  hereof,  the  Stockholder  is the  beneficial  and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the  Stockholder  Shares.  None of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the  Stockholder  Shares,  and no proxy,  power of  attorney  or other
authorization has been granted with respect to any of the Stockholder Shares.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
limited partnership duly formed and validly existing under the laws of the State
of  Delaware.  CIGNA  Investments,  Inc.  ("CII") as  authorized  agent of Cigna
Mezzanine  Partners III, Inc., the general partner of the  Stockholder,  has all
requisite  power  and  authority  to enter  into  this  Agreement  on  behalf of
Stockholder and perform Stockholder's obligations hereunder. Such actions by the
Stockholder  (a)  require no action by or in  respect  of, or filing  with,  any
Governmental  Entity with  respect to the  Stockholder,  other than any required
filings  under  Section 13 of the  Exchange Act or under the HSR Act, and (b) do
not and will not  contravene  or  constitute  default  under  any  provision  of
applicable  law or regulation or any  agreement,  judgment,  injunction,  order,
decree  or  other  instrument  binding  on  the  Stockholder  or  result  in the
imposition of any lien, pledge,  security interest,  charge or other encumbrance
or restriction on any of the Stockholder  Shares (other than as provided in this
Agreement with respect to Stockholder Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by CII, as authorized agent of Cigna Mezzanine Partners III, Inc.,
the general partner of the Stockholder and is the valid and binding agreement of
the  Stockholder,  enforceable  against the  Stockholder in accordance  with its
terms,  except  as  enforcement  may  be  limited  by  bankruptcy,   insolvency,
moratorium or other similar laws relating to creditors'  rights generally and by
equitable   principles  to  which  the  remedies  of  specific  performance  and
injunctive and similar forms of relief are subject.

            Section 2.04.  Total Shares.  The 187,454.5 shares of Arch Preferred
Stock are the only  shares of  capital  stock of Arch owned  beneficially  or of
record as of the date hereof by the  Stockholder,  and the Stockholder  does not
have any option to purchase or right to subscribe  for or otherwise  acquire any
securities  of Arch  other  than upon  conversion  of the Notes and has no other
interest in or voting rights with respect to any other securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.



                                      4

<PAGE>




            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.


                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to  preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further  action as may be necessary or reasonably  desirable to  consummate  the
transactions contemplated by this Agreement.



                                      5

<PAGE>




            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

            with a copy to:

            Robert Stilwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            Cigna Mezzanine Partners III, L.P.
            c/o CIGNA Investments, Inc.
            900 Cottage Grove Road, S-307
            Hartford, CT 06152-2307
            Attention: Thomas P. Shea, Private Securities Division (S-307)
            Facsimile: 860-726-7203



                                      6

<PAGE>




            with an additional copy to:

            William M. Duncan
            CIGNA Corporation
            900 Cottage Grove Road, S-215
            Hartford, CT  06512-2215
            Facsimile: 860-726-8885

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).

            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective when a  counterparts  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

            Section 4.08.  Governing Law.  This Agreement shall  be governed and
construed  in accordance with  the laws of the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether  by  operation  of law  or  otherwise)  except  to the
stockholders  of the  Stockholder as permitted  herein without the prior written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective  successors and assigns. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

            Section 4.10.  Amendments; Termination.  This  Agreement may  not be
modified,  amended,  altered  or  supplemented,  except  upon  the execution and
delivery of a written agreement executed  by the parties hereto.  This Agreement
shall terminate upon the  termination of the Merger Agreement in accordance with
the terms thereof.  This Agreement may be



                                      7

<PAGE>



terminated by  Stockholder  if (i) the Effective Time fails to occur by November
30, 1998 (provided that the right to terminate this Agreement  under this clause
(i) shall not be  available  to  Stockholder  if the failure by  Stockholder  to
fulfill any covenant or agreement  under this Agreement has been the cause of or
resulted in the failure of the Merger to occur on or before such date; provided,
further,  that  if the  failure  of the  Effective  Time  to  have  occurred  is
attributable to any court of competent jurisdiction,  or some other governmental
body or regulatory  authority having issued an order,  decree or ruling or taken
any other action temporarily restraining, enjoining or otherwise prohibiting the
Merger,  then the  Stockholder's  right to terminate this  Agreement  under this
clause (i) shall not be exercisable  until the earlier of (x) one day after such
order,  decree or ruling has been  dissolved or (y) February 28, 1999);  or (ii)
sections  2.1(b),  2.1(c),  2.1(d),  2.3(a),  5.6,  5.18 or 6.1(b) of the Merger
Agreement are amended or waived without the consent of Stockholder.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.


        [The Remainder of This Page Has Been Intentionally Left Blank]





                                      8

<PAGE>





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


                            CIGNA MEZZANINE PARTNERS III, L.P.

                            CIGNA Mezzanine Partners III, Inc.,
                                General Partner

                            By: CIGNA Investments, Inc.,
                                  as authorized agent

                                By    /s/ Thomas P. Shea
                                      Thomas P. Shea
                                      Vice President


                                    POGO PRODUCING COMPANY


                                    By    /s/ Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary





                                      9

<PAGE>


                                 Schedule 2.01

1.    None.



                                      10



                                                                   EXHIBIT 2.6

                            STOCKHOLDER AGREEMENT
                 (The Lincoln National Life Insurance Company)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo Producing Company, a Delaware  corporation ("Pogo") and The
Lincoln  National Life Insurance  Company,  a life insurance  company  organized
under the laws of the State of Indiana (the "Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS, the Stockholder is the beneficial owner of 63,625 shares of
Exchangeable  Convertible  Preferred  Stock,  par value $0.01 per share, of Arch
(the "Arch  Preferred  Stock"),  $43,727  principal  amount of the Arch's  9.75%
Convertible  Subordinated Notes due 2004 (the "Series A Notes"), and $393,539 of
Arch's  Adjustable  Rate  Series B  Subordinated  Notes due 2004 (the  "Series B
Notes" and,  collectively  with the Series A Notes, the "Notes") (such shares of
Preferred  Common  Stock,  together  with any  shares of  capital  stock of Arch
acquired  by the  Stockholder  after the date hereof and during the term of this
Agreement,  whether by conversion of the Arch Preferred Stock, conversion of the
Notes, or otherwise,  being collectively  referred to herein as the "Stockholder
Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo.

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (I) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement thereof prior to the Voting



                                      1

<PAGE>



Termination  Date, or in connection with any written consent of the stockholders
of Arch given prior to the Voting  Termination  Date, the Stockholder shall vote
or cause to be voted  the  Stockholder  Shares in favor of the  approval  of the
Merger and each of the other  transactions  contemplated by the Merger Agreement
and in favor of the  approval  and  adoption  of the Merger  Agreement,  and any
actions required in furtherance  hereof and thereof.  The Stockholder  shall not
enter into any  agreement or  understanding  with any person prior to the Voting
Termination  Date,  directly  or  indirectly,  to vote,  grant any proxy or give
instructions with respect to the voting of the Stockholder  Shares in any manner
inconsistent with the preceding sentence.

            Section  1.02.  Proxies  and  Voting  Agreements.   Except  for  the
Investment  Administration  Agreement between Lincoln Investment Management Inc.
and CIGNA Investments,  Inc. entered into as of January 1, 1998, the Stockholder
hereby revokes any and all previous  proxies granted with respect to matters set
forth in Section 1.01.  Prior to the Voting  Termination  Date, the  Stockholder
shall not,  directly or indirectly,  except as  contemplated  hereby,  grant any
proxies or powers of attorney with respect to matters set forth in Section 1.01,
deposit  any of the  Stockholder  Shares or enter into a voting  agreement  with
respect to any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers, directors, employees, general partners, agents, affiliates over
which  it has  control  or  other  representatives  (collectively,  "Stockholder
Representatives") to, directly or indirectly, solicit or encourage (including by
way of providing  information)  any  prospective  acquiror or the  invitation or
submission  of any  inquiries,  proposals  or  offers or any  other  efforts  or
attempts  that  constitute,  or may  reasonably  be  expected  to  lead  to,  an
Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.




                                      2

<PAGE>



            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also an Arch  Representative from taking actions permitted by Section 4.2
of the Merger Agreement.

            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder  Shares;  except dividends or distributions to
the stockholders of the Stockholder if such persons agree in writing to be bound
by the terms hereof and provided  further,  that such  transfer does not, in the
opinion of a tax advisor  reasonably  acceptable  to Pogo,  violate the terms of
Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a) Prior to the  termination of this  Stockholders  Agreement,  the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement  but  prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to any  Stockholder  Shares,  Notes,  shares of Pogo Common Stock, or securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert the Notes owned by it into such number of shares of Pogo Common Stock as
is equal to (i) the unpaid  principal amount of such Notes divided by (ii) $2.75
per share of Arch Common Stock, multiplied by (ii) the Common Exchange Ratio. In
addition,  the  Stockholder  agrees  to  accept  cash in lieu of any  fractional
interest  that it would  otherwise  be entitled  to  pursuant  to the  foregoing
conversion,  calculated in the manner set forth in the Merger Agreement.  To the
extent  that the  agreement  set  forth in the  immediately  preceding  sentence
requires an amendment to the Notes,  the Notes shall be deemed amended as of the
Effective Time to reflect such changes.  The conversion price for the Notes will
also be subject,  if applicable,  as described in Section 11.3 of the Securities
Purchase  Agreement,  dated as of October 15, 1994, by and between the holder of
such  Note and Arch (the  "Securities  Purchase  Agreement")  as a result of any
events  that occur  because of actions  taken by Arch or Pogo from and after the
date of this Agreement.




                                      3

<PAGE>



            (d) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert  all of the  Stockholder  Shares  controlled  owned,  or  held  by it in
accordance with, and for the consideration described in, the Merger Agreement.


                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date  hereof,  the  Stockholder  is the  beneficial  and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the Stockholder Shares.  Except for the Investment  Administration  Agreement
between Lincoln Investment  Management Inc. and CIGNA Investments,  Inc. entered
into as of  January 1, 1998,  none of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the  Stockholder  Shares,  and no proxy,  power of  attorney  or other
authorization has been granted with respect to any of the Stockholder Shares.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
life insurance  company duly incorporated and validly existing under the laws of
the State of Indiana and has all  requisite  corporate  power and  authority  to
enter into this Agreement and perform its obligations hereunder. Such actions by
the  Stockholder  (a) require no action by or in respect of, or filing with, any
Governmental  Entity with  respect to the  Stockholder,  other than any required
filings  under  Section 13 of the  Exchange Act or under the HSR Act, and (b) do
not and will not  contravene  or  constitute  a default  under any  provision of
applicable  law or regulation or any  agreement,  judgment,  injunction,  order,
decree  or  other  instrument  binding  on  the  Stockholder  or  result  in the
imposition of any lien, pledge,  security interest,  charge or other encumbrance
or restriction on any of the Stockholder  Shares (other than as provided in this
Agreement with respect to Stockholder Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04.  Total Shares.  The 63,625  shares of  Arch  Preferred
Stock are  the only shares  of capital  stock of  Arch owned  beneficially or of
record as of the date  hereof by the  Stockholder, and the  Stockholder does not
have any option to purchase or right to subscribe for



                                      4

<PAGE>



or otherwise  acquire any  securities of Arch other than upon  conversion of the
Notes and has no other  interest in or voting  rights with  respect to any other
securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.





                                      5

<PAGE>



                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to  preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further  action as may be necessary or reasonably  desirable to  consummate  the
transactions contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970




                                      6

<PAGE>



            with a copy to:

            Robert Stilwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            Lincoln Investment Management, Inc.
            200 East Berry Street, Renaissance Square
            Fort Wayne, IN 46802
            Attn: Investments/Private Placements
            Facsimile: ________________________

            with an additional copy to:

            C. Elisia Frazier
            Lincoln National Corporation
            200 E. Berry Street
            Fort Wayne, IN  46802
            Facsimile: 219-455-5403

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).

            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when a  counterpart  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto, any rights or remedies hereunder.




                                      7

<PAGE>



            Section 4.08.  Governing Law.  This Agreement shall  be governed and
construed  in accordance with  the laws of the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether  by  operation  of law  or  otherwise)  except  to the
stockholders  of the  Stockholder as permitted  herein without the prior written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective  successors and assigns. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

            Section 4.10.  Amendments;  Termination.  This  Agreement may not be
modified,  amended,  altered or  supplemented,  except  upon the  execution  and
delivery of a written agreement  executed by the parties hereto.  This Agreement
shall terminate upon the termination of the Merger  Agreement in accordance with
the terms  thereof.  This  Agreement may be terminated by Stockholder if (i) the
Effective  Time fails to occur by November 30, 1998  (provided that the right to
terminate  this  Agreement  under  this  clause  (i) shall not be  available  to
Stockholder  if the failure by  Stockholder to fulfill any covenant or agreement
under this  Agreement  has been the cause of or  resulted  in the failure of the
Merger to occur on or before such date; provided,  further,  that if the failure
of the Effective Time to have occurred is attributable to any court of competent
jurisdiction,  or some other  governmental  body or regulatory  authority having
issued an  order,  decree  or  ruling  or taken  any  other  action  temporarily
restraining,   enjoining  or  otherwise   prohibiting   the  Merger,   then  the
Stockholder's  right to terminate this Agreement under this clause (i) shall not
be  exercisable  until the  earlier of (x) one day after such  order,  decree or
ruling has been  dissolved or (y) February 28, 1999);  or (ii) sections  2.1(b),
2.1(c),  2.1(d), 2.3(a), 5.6, 5.18 or 6.1(b) of the Merger Agreement are amended
or waived without the consent of Stockholder.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13. Attorneys' Fees. If  any action at law or in equity is
necessary to  enforce or  interpret the terms  of this Agreement, the prevailing
party shall be entitled to



                                      8

<PAGE>



reasonable  attorneys' fees, costs and necessary  disbursements,  in addition to
any other relief to which such party may be entitled.



        [The Remainder of This Page Has Been Intentionally Left Blank]




                                      9

<PAGE>



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


                                    THE LINCOLN NATIONAL LIFE
                                         INSURANCE COMPANY


                                    By    /s/ R. G. Marsh
                                          R. G. Marsh
                                          Vice President


                                    POGO PRODUCING COMPANY


                                    By    /s/ Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary





                                      10

<PAGE>


                                 Schedule 2.01


1.    None.



                                      11



                                                                   EXHIBIT 2.7

                            STOCKHOLDER AGREEMENT
                        (Threshold Development Company)


            This Stockholder  Agreement (this  "Agreement")  dated as of May 28,
1998 is between Pogo  Producing  Company,  a Delaware  corporation  ("Pogo") and
Threshold Development Company, a Texas corporation (the "Stockholder").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned subsidiary of Pogo ("Sub"),  and Arch Petroleum Inc. ("Arch"),  a Delaware
corporation,  are entering  into an Agreement and Plan of Merger dated as of the
date  hereof  (as  amended  from  time to time  pursuant  thereto,  the  "Merger
Agreement");

            WHEREAS,  the  Stockholder  is the  record and  beneficial  owner of
2,390,914  shares of Common Stock, par value $0.01 per share, of Arch (the "Arch
Common  Stock") (such shares of Arch Common  Stock,  together with any shares of
capital  stock of Arch  acquired  by the  Stockholder  after the date hereof and
during the term of this Agreement,  being collectively referred to herein as the
"Stockholder Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an inducement to it to do so, the Stockholder  hereby
makes the agreements as set forth in this Agreement for the benefit of Pogo.

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):


                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement  thereof prior to the Voting Termination Date, or in
connection with any written  consent of the  stockholders of Arch given prior to
the Voting Termination Date, the Stockholder shall vote or cause to be voted the
Stockholder  Shares in favor of the approval of the Merger and each of the other
transactions  contemplated by the Merger  Agreement and in favor of the approval
and adoption of the Merger




                                      1

<PAGE>



Agreement,  and any actions  required in  furtherance  hereof and  thereof.  The
Stockholder shall not enter into any agreement or understanding  with any person
prior to the Voting Termination Date, directly or indirectly, to vote, grant any
proxy or give instructions with respect to the voting of the Stockholder  Shares
in any manner inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of its officers,  directors,  employees,  partners,  agents, affiliates or other
representatives  (collectively,  "Stockholder  Representatives") to, directly or
indirectly, solicit or encourage (including by way of providing information) any
prospective acquiror or the invitation or submission of any inquiries, proposals
or offers or any other efforts or attempts that constitute, or may reasonably be
expected to lead to, an Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e) Notwithstanding  anything contained herein to the contrary,  the
provisions of this Section 1.03 do not prohibit any  Stockholder  Representative
who is also a Arch  Representative  from taking actions permitted by Section 4.2
of the Merger Agreement.





                                      2

<PAGE>



            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder  Shares;  except dividends or distributions to
the stockholders of the Stockholder if such persons agree in writing to be bound
by the terms hereof and provided  further,  that such  transfer does not, in the
opinion of a tax advisor  reasonably  acceptable  to Pogo,  violate the terms of
Section 1.05(b) hereof.

            Section 1.05. Other Actions.

            (a)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder  Agreement  but  prior to the  termination  of this  Agreement,  the
Stockholder  will not sell or in any other way reduce such party's risk relative
to  any  Stockholder  Shares,   shares  of  Pogo  Common  Stock,  or  securities
convertible into Pogo Common Stock controlled, owned or held by such Stockholder
prior to the  Merger,  nor will it sell,  or in any  other way  reduce  its risk
relative  to any  shares of Pogo  Common  Stock  received  in  exchange  for the
Stockholder  Shares in the Merger  (within the meaning of Section  201.01 of the
SEC's Financial Reporting Release No. 1) or any securities convertible into Pogo
Common Stock, until the earlier of (i) such time as financial results (including
combined sales and net income)  covering at least 30 days of Pogo's  post-merger
operations have been published, except as permitted by Staff Accounting Bulletin
No. 76 (or any successor  thereto)  issued by the SEC and (ii) 60 days after the
first full calendar  month of Pogo's  post-merger  operations  (the  "Restricted
Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, it shall
convert  all of the  Stockholder  Shares  controlled,  owned  or  held  by it in
accordance with, and for the consideration described in, the Merger Agreement.

                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01. Ownership. Except as disclosed on Schedule 2.01, as of
the date  hereof,  the  Stockholder  is the  beneficial  and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the  Stockholder  Shares.  None of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the




                                      3

<PAGE>



Stockholder  Shares, and no proxy, power of attorney or other  authorization has
been granted with respect to any of the Stockholder Shares.

            Section 2.02. Authority and Non-Contravention.  The Stockholder is a
corporation  duly  incorporated and validly existing under the laws of the State
of Texas.  The  Stockholder  has all requisite  corporate power and authority to
enter into this Agreement and perform its obligations hereunder. Such actions by
the  Stockholder  (a) require no action by or in respect of, or filing with, any
Governmental  Entity with  respect to the  Stockholder,  other than any required
filings  under  Section 13 of the  Exchange Act or under the HSR Act, and (b) do
not and will not  contravene  or  constitute  a default  under any  provision of
applicable  law or regulation or any  agreement,  judgment,  injunction,  order,
decree  or  other  instrument  binding  on  the  Stockholder  or  result  in the
imposition of any lien, pledge,  security interest,  charge or other encumbrance
or restriction on any of the Stockholder  Shares (other than as provided in this
Agreement with respect to Stockholder Shares).

            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04.  Total  Shares.  The  Stockholder  Shares are the only
shares of capital stock of Arch owned  beneficially  or of record as of the date
hereof  by the  Stockholder,  and the  Stockholder  does not have any  option to
purchase or right to subscribe for or otherwise  acquire any  securities of Arch
and has no  other  interest  in or  voting  rights  with  respect  to any  other
securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06.  Reasonable  Efforts.  Prior to the Voting Termination
Date,  the  Stockholder  shall use  reasonable  efforts to take,  or cause to be
taken, all actions,  and to do, or cause to be done, and to assist and cooperate
with Pogo in doing, all things necessary,  proper or advisable to consummate and
make effective the Merger and the other transactions  contemplated by the Merger
Agreement and this Agreement.






                                      4

<PAGE>



                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.

            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delays or restrictions.

                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to  preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further action as may be necessary or desirable to consummate  the  transactions
contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder. This provision is without prejudice to any other rights that Pogo




                                      5

<PAGE>



may have  against the  Stockholder  for any  failure to perform its  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:

      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

            with a copy to:

            Robert Stillwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            Threshold Development Company
            777 Taylor Street, Suite IID
            Fort Worth, TX 76102
            Attention: Bud Vinson
            Facsimile: 817-870-1504





                                      6

<PAGE>



            with a copy to:

            Weil, Gotshal & Manges LLP
            100 Crescent Court, Suite 1300
            Dallas, TX 75201
            Attention: R.  Scott Cohen
                       Craig W. Adas
            Facsimile: 214-746-7777

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the word  "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with respect to Section 13(d) of the Exchange Act).

            Section 4.06. Counterparts. This Agreement may be executed in two or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when a  counterpart  has been signed by each of the
parties and delivered to the other party,  it being  understood that all parties
need not sign the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

            Section 4.08. Governing Law.  This Agreement  shall be  governed and
construed  in accordance with the laws of  the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether  by  operation  of law  or  otherwise)  except  to the
stockholders  of the  Stockholder as permitted  herein without the prior written
consent of the other party.  Subject to the preceding  sentence,  this Agreement
will be binding upon,  inure to the benefit of and be enforceable by the parties
and their respective  successors and assigns. All costs and expenses incurred in
connection with this Agreement shall be paid by the party incurring such cost or
expense.

            Section 4.10. Amendments;  Termination. This  Agreement  may  not be
modified,  amended,  altered or  supplemented,  except upon  the  execution  and
delivery of a written




                                      7

<PAGE>



agreement  executed by the parties  hereto.  This Agreement shall terminate upon
the termination of the Merger Agreement in accordance with the terms thereof.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this Agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.


         [The Remainder of This Page Has Been Intentionally Left Blank]




                                      8

<PAGE>



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


                                    THRESHOLD DEVELOPMENT COMPANY


                                    By    /s/   Bud Vinson
                                          Bud Vinson
                                          President


                                    POGO PRODUCING COMPANY


                                    By    /s/   Gerald A. Morton
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary




                                      9

<PAGE>


                                 Schedule 2.01

1.    1,889,053 of the  Stockholder  Shares have been pledged to Bank One Texas,
      N.A. in connection with that certain Pledge Agreement dated May 30, 1997.




                                      10



                                                                   EXHIBIT 2.8

                            STOCKHOLDER AGREEMENT
                        (Directors/Executive Officers)

            This Stockholder  Agreement dated as of May __, 1998 is between Pogo
Producing  Company,  a  Delaware   corporation  ("Pogo")  and  [Insert  Name  of
Director/Officer]  (the  "Stockholder"),  an  individual  and  [title]  of  Arch
Petroleum Inc., a Delaware corporation ("Arch").

            WHEREAS,  Pogo,  Alphac,  Inc., a Delaware  corporation and a wholly
owned  subsidiary of Pogo  ("Sub"),  and Arch are entering into an Agreement and
Plan of  Merger  dated as of the  date  hereof  (as  amended  from  time to time
pursuant thereto, the "Merger Agreement");

            WHEREAS,  the  Stockholder  is the  record and  beneficial  owner of
[insert number] shares of Common Stock,  par value $0.01 per share, of Arch (the
"Arch Common Stock") (such shares of Arch Common Stock, together with any shares
of capital stock of Arch acquired by the  Stockholder  after the date hereof and
during the term of this Agreement,  being collectively referred to herein as the
"Stockholder Shares"); and

            WHEREAS, as a condition to the willingness of Pogo to enter into the
Merger  Agreement,  and as an  inducement  to it to do so, the  Stockholder  has
agreed for the benefit of Pogo as set forth in this Agreement;

            NOW,   THEREFORE,   in   consideration   of  the  premises  and  the
representations,   warranties,   covenants  and  agreements  contained  in  this
Agreement,  the parties  hereby  agree as follows  (terms  defined in the Merger
Agreement and used but not defined  herein having the meanings  assigned to such
terms in the Merger Agreement):

                                  ARTICLE I

                         COVENANTS OF THE STOCKHOLDER

            Section 1.01.  Agreement to Vote. At any meeting of the stockholders
of Arch held prior to the  earlier of (i) the  Effective  Time of the Merger and
(ii) the  termination  of the Merger  Agreement  (such earlier time being herein
referred to as the "Voting  Termination  Date"),  however  called,  and at every
adjournment or postponement  thereof prior to the Voting Termination Date, or in
connection with any written  consent of the  stockholders of Arch given prior to
the Voting Termination Date, the Stockholder shall vote or cause to be voted the
Stockholder  Shares in favor of the approval of the Merger and each of the other
transactions  contemplated by the Merger  Agreement and in favor of the approval
and adoption of the Merger


                                     1



<PAGE>



Agreement,  and any actions  required in  furtherance  hereof and  thereof.  The
Stockholder shall not enter into any agreement or understanding  with any person
prior to the Voting Termination Date, directly or indirectly, to vote, grant any
proxy or give instructions with respect to the voting of the Stockholder  Shares
in any manner inconsistent with the preceding sentence.

            Section 1.02. Proxies and Voting Agreements.  The Stockholder hereby
revokes any and all previous  proxies  granted with respect to matters set forth
in Section 1.01.  Prior to the Voting  Termination  Date, the Stockholder  shall
not, directly or indirectly, except as contemplated hereby, grant any proxies or
powers of attorney  with respect to matters set forth in Section  1.01,  deposit
any of the Stockholder  Shares or enter into a voting  agreement with respect to
any of the Stockholder Shares.

            Section 1.03. No Solicitation.

            (a) From and after the date  hereof  until  the  termination  of the
Merger Agreement, the Stockholder will not, and will not authorize or permit any
of his agents, affiliates or other representatives  (collectively,  "Stockholder
Representatives") to, directly or indirectly, solicit or encourage (including by
way of providing  information)  any  prospective  acquiror or the  invitation or
submission  of any  inquiries,  proposals  or  offers or any  other  efforts  or
attempts  that  constitute,  or may  reasonably  be  expected  to  lead  to,  an
Acquisition Proposal.

            (b)  The  Stockholder  shall  immediately  cease  and  cause  to  be
terminated  any  existing  solicitation,  initiation,  encouragement,  activity,
discussion  or  negotiation  with  any  parties  conducted   heretofore  by  the
Stockholder or any Stockholder  Representatives  with respect to any Acquisition
Proposal existing on the date hereof.

            (c)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  will promptly notify Pogo of any requests for  information  made to
the  Stockholder  or  any  Stockholder  Representative  or  the  receipt  of any
Acquisition Proposal made to the Stockholder or any Stockholder  Representative,
including the identity of the person or group  engaging in such  discussions  or
negotiations,  requesting such information or making such Acquisition  Proposal,
and the material terms and conditions of any Acquisition Proposal.

            (d)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not enter into any  agreement  with any person that  provides
for, or in any way facilitates, an Acquisition Proposal.

            (e)  The  provisions  of  this  Section  1.03  do not  prohibit  any
Stockholder  Representative  who is  also  an Arch  Representative  from  taking
actions permitted by Section 4.2 of the Merger Agreement.



                                     2



<PAGE>



            Section 1.04.  Transfer of  Stockholder  Shares by the  Stockholder.
Prior to the record date for the Arch stockholder  meeting to vote on the Merger
Agreement, the Stockholder will not sell, transfer,  assign, convey or otherwise
dispose of any of the Stockholder Shares.

            Section 1.05. Other Actions.

            (a)  Prior  to  the  termination  of  the  Merger   Agreement,   the
Stockholder  shall not take any action  that would in any way  restrict,  limit,
impede or interfere  with the  performance of its  obligations  hereunder or the
transactions contemplated hereby or by the Merger Agreement.

            (b) The  Stockholder  agrees  that  from and  after the date of this
Stockholder Agreement,  the Stockholder will not sell or in any other way reduce
such  party's risk  relative to any  Stockholder  Shares,  shares of Pogo Common
Stock, or securities  convertible  into Pogo Common Stock  controlled,  owned or
held by such Stockholder prior to the Merger,  nor will it sell, or in any other
way reduce its risk  relative  to any shares of Pogo  Common  Stock  received in
exchange for the Stockholder Shares in the Merger (within the meaning of Section
201.01  of the  SEC's  Financial  Reporting  Release  No.  1) or any  securities
convertible  into  Pogo  Common  Stock,  until the  earlier  of (i) such time as
financial results (including combined sales and net income) covering at least 30
days of Pogo's post-merger  operations have been published,  except as permitted
by Staff Accounting Bulletin No. 76 (or any successor thereto) issued by the SEC
and (ii) 60 days  after  the first  full  calendar  month of Pogo's  post-merger
operations (the "Restricted Period").

            (c) The  Stockholder  agrees that, at the  Effective  Time, he shall
convert  all of the  Stockholder  Shares  controlled,  owned  or  held by him in
accordance with, and for the consideration described in, the Merger Agreement.

                                  ARTICLE II

             REPRESENTATIONS, WARRANTIES AND ADDITIONAL COVENANTS
                              OF THE STOCKHOLDER

            The Stockholder represents, warrants and covenants to Pogo that:

            Section 2.01.  Ownership.  Except as set forth on Schedule 2.01, the
Stockholder  is, as of the date hereof,  the  beneficial and record owner of the
Stockholder  Shares,  the Stockholder has the sole right to vote the Stockholder
Shares and there are no  restrictions  on rights of  disposition  or other lien,
pledge, security interest, charge or other encumbrance or restriction pertaining
to the  Stockholder  Shares.  None of the  Stockholder  Shares is subject to any
voting trust or other agreement,  arrangement or restriction with respect to the
voting of the  Stockholder  Shares,  and no proxy,  power of  attorney  or other
authorization has been granted with respect to any of the Stockholder Shares.



                                     3



<PAGE>



            Section 2.03. Binding Effect.  This Agreement has been duly executed
and delivered by the Stockholder  and is the valid and binding  agreement of the
Stockholder,  enforceable  against the Stockholder in accordance with its terms,
except as enforcement  may be limited by bankruptcy,  insolvency,  moratorium or
other  similar laws  relating to  creditors'  rights  generally and by equitable
principles  to which the remedies of specific  performance  and  injunctive  and
similar forms of relief are subject.

            Section 2.04.  Total  Shares.  The  Stockholder  Shares are the only
shares of capital stock of Arch owned  beneficially  or of record as of the date
hereof  by the  Stockholder,  and the  Stockholder  does not have any  option to
purchase or right to subscribe for or otherwise  acquire any  securities of Arch
and has no  other  interest  in or  voting  rights  with  respect  to any  other
securities of Arch.

            Section 2.05. Finder's Fees. No investment banker,  broker or finder
is entitled  to a  commission  or fee from Arch,  Pogo or Sub in respect of this
Agreement  based upon any  arrangement  or agreement made by or on behalf of the
Stockholder.

            Section 2.06. Reasonable Efforts. Prior to the Termination Date, the
Stockholder  shall,  solely  in his  capacity  as a  stockholder  of  Arch,  use
reasonable  efforts to take,  or cause to be taken,  all actions,  and to do, or
cause to be done,  and to assist and  cooperate  with Pogo in doing,  all things
necessary,  proper or advisable to consummate  and make effective the Merger and
the other transactions contemplated by the Merger Agreement and this Agreement.


                                 ARTICLE III

              REPRESENTATIONS, WARRANTIES AND COVENANTS OF POGO

            Pogo represents, warrants and covenants to the Stockholder that:

            Section 3.01. Corporate Power and Authority.  Pogo has all requisite
corporate  power and  authority to enter into this  Agreement and to perform its
obligations hereunder.  The execution,  delivery and performance by Pogo of this
Agreement and the consummation by Pogo of the transactions  contemplated  hereby
have been duly authorized by all necessary corporate action on the part of Pogo.

            Section 3.02. Binding Effect.  This Agreement has been duly executed
and delivered by Pogo and is a valid and binding agreement of Pogo,  enforceable
against Pogo in accordance with its terms,  except as enforcement may be limited
by  bankruptcy,  insolvency,  moratorium  or  other  similar  laws  relating  to
creditors' rights generally and by equitable principles to which the remedies of
specific performance and injunctive and similar forms of relief are subject.



                                     4



<PAGE>



            Section  3.03.  Cooperation.  Subject to Section  5.16 of the Merger
Agreement and the rules and  requirements  of applicable  securities  laws, Pogo
shall use reasonable efforts to take, or cause to be taken, all actions,  and to
do, or cause to be done,  and to assist and cooperate  with the  Stockholder  in
doing,  all things  necessary,  proper or advisable to allow the  Stockholder to
publicly  sell shares of Pogo  Common  Stock  received  in the Merger  after the
Restricted Period without any unreasonable delay or restrictions.

                                  ARTICLE IV

                                MISCELLANEOUS

            Section 4.01. Expenses. Each party hereto shall pay its own expenses
incident to preparing for entering into and carrying out this  Agreement and the
consummation of the transactions  contemplated hereby;  provided,  however, that
Arch may pay such expenses of the Stockholder.

            Section 4.02. Further Assurances.  From time to time, at the request
of the other party, each party shall execute and deliver or cause to be executed
and  delivered  such  additional  documents  and  instruments  and take all such
further action as may be necessary or desirable to consummate  the  transactions
contemplated by this Agreement.

            Section 4.03. Specific Performance.  (a) The Stockholder agrees that
Pogo would be  irreparably  damaged if for any reason the  Stockholder  fails to
perform any of the Stockholder's obligations under this Agreement, and that Pogo
would  not have an  adequate  remedy  at law for money  damages  in such  event.
Accordingly,  Pogo shall be entitled to seek specific performance and injunctive
and other  equitable  relief to enforce the performance of this agreement by the
Stockholder.  This provision is without  prejudice to any other rights that Pogo
may have  against the  Stockholder  for any  failure to perform his  obligations
under this Agreement;  (b) Pogo agrees that the Stockholder would be irreparably
damaged if for any reason Pogo fails to perform any of Pogo's  obligations under
this Agreement,  and that the  Stockholder  would not have an adequate remedy at
law for money  damages in such  event.  Accordingly,  the  Stockholder  shall be
entitled to seek specific  performance and injunctive and other equitable relief
to enforce the  performance of this agreement by Pogo. This provision is without
prejudice to any other rights that the Stockholder may have against Pogo for any
failure to perform its obligations under this Agreement.

            Section  4.04.  Notices.  Any notice or  communication  required  or
permitted  hereunder  shall  be in  writing  and  either  delivered  personally,
telegraphed  or  telecopied  or sent by certified or  registered  mail,  postage
prepaid,  and shall be deemed to be given,  dated and received when so delivered
personally,  telegraphed or telecopied  or, if mailed,  five business days after
the date of mailing to the  following  address or  telecopy  number,  or to such
other address or addresses as such person may  subsequently  designate by notice
given hereunder:



                                     5



<PAGE>



      (a)   if to Pogo or Sub, to:

            Pogo Producing Company
            5 Greenway Plaza, Suite 2700
            Houston, Texas 77046
            Attention: Gerald A. Morton
            Facsimile: 713-297-4970

            with a copy to:

            Robert Stillwell
            Baker & Botts, L.L.P.
            3000 One Shell Plaza
            Houston, Texas  77002
            Facsimile:  713-229-1522

      (b)   if to Stockholder, to:

            [Insert name]
            [Insert address]

            Facsimile: [Insert fax no.]

            with a copy to:

            --------------------------
            --------------------------
            Attention: ---------------
            Facsimile: ---------------

            Section  4.05.  Interpretation.  When a  reference  is  made in this
Agreement to Sections,  such  reference  shall be to a Section of this Agreement
unless  otherwise  indicated.  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.  Whenever the words "include,"  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without  limitation." Unless the context otherwise requires,  "or" is
disjunctive but not necessarily exclusive, and words in the singular include the
plural  and in the plural  include  the  singular.  The term  "person"  is to be
interpreted broadly to include any individual, corporation,  partnership, trust,
limited  liability  company,  government  or other entity and any group (as used
with  respect  to  Section  13(d) of the  Securities  Exchange  Act of 1934,  as
amended).

            Section 4.06.  Counterparts.  This  Agreement may be executed in two
or  more  counterparts,  all  of  which  shall  be considered one  and the  same
agreement and shall become


                                     6



<PAGE>



effective  when a  counterpart  has  been  signed  by  each of the  parties  and
delivered to the other party, it being understood that all parties need not sign
the same counterpart.

            Section 4.07. Entire Agreement;  No Third Party Beneficiaries.  This
Agreement  (a)  constitutes  the  entire  agreement  and  supersedes  all  prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject  matter hereof and (b) is not intended to confer upon any
person other than the parties hereto any rights or remedies hereunder.

            Section 4.08. Governing Law.  This  Agreement shall be  governed and
construed  in accordance with the  laws of the State of Delaware, without giving
effect to the principles of conflicts of law thereof.

            Section  4.09.  Assignment.  Neither this  Agreement  nor any of the
rights,  interests  or  obligations  hereunder  shall be  assigned by any of the
parties  hereto  (whether by  operation of law or  otherwise)  without the prior
written  consent of the other party.  Subject to the  preceding  sentence,  this
Agreement  will be binding upon,  inure to the benefit of and be  enforceable by
the parties and their respective successors and assigns.

            Section 4.10.  Amendments;  Termination.  This  Agreement may not be
modified,  amended,  altered or  supplemented,  except  upon the  execution  and
delivery of a written agreement  executed by the parties hereto.  This Agreement
shall terminate upon the termination of the Merger  Agreement in accordance with
the terms thereof.

            Section  4.11.  Certain  Events.  The  Stockholder  agrees that this
Agreement and the obligations  hereunder shall attach to the Stockholder  Shares
beneficially  owned by such  Stockholder and shall be binding upon any person to
which  legal or  beneficial  ownership  of such shares  shall  pass,  whether by
operation of law or otherwise.

            Section 4.12.  Severability.  Whenever  possible,  each provision or
portion of any provision of this Agreement will be interpreted in such manner as
to be effective  and valid but if any  provision or portion of any  provision of
this agreement is held to be invalid,  illegal or  unenforceable in any respect,
such  invalidity,  illegality  or  unenforceability  will not  affect  any other
provision  or portion of any  provision,  and this  Agreement  will be reformed,
construed and enforced as if such invalid, illegal or unenforceable provision or
portion of any  provision  had never been  contained  herein.  The parties shall
endeavor  in  good  faith  negotiations  to  replace  any  invalid,  illegal  or
unenforceable  provision  with a valid  provision  the  effects of which come as
close as possible to those of such invalid, illegal or unenforceable provision.

            Section 4.13.  Attorneys' Fees. If any action at law or in equity is
necessary to enforce or interpret the terms of this  Agreement,  the  prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements,  in  addition  to any  other  relief to which  such  party may be
entitled.



                                     7



<PAGE>


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




                                    [Stockholder]


                                    POGO PRODUCING COMPANY



                                    By
                                          Gerald A. Morton
                                          Vice President-Law
                                            and Corporate Secretary


                                     8





                                                                  Exhibit 99.1



                                                         FOR IMMEDIATE RELEASE
                                                  Contact: Paul G. Van Wagenen
                                                                (713) 297-5000
                                                     at Pogo Producing Company
                                                                        or
                                                                   Larry Kalas
                                                                (817) 332-9209
                                                        at Arch Petroleum Inc.



                POGO PRODUCING COMPANY AND ARCH PETROLEUM INC.
                               ANNOUNCE MERGER


      HOUSTON and FT. WORTH, TX. - May 29, 1998 - Pogo Producing  Company (NYSE:
PPP) and Arch  Petroleum  Inc.  (NASDAQ:  ARCH)  announced  today that they have
entered into a definitive  agreement  and plan of merger that will provide for a
tax-free,  stock for stock  transaction  through which Arch will become a wholly
owned  subsidiary  of Pogo.  The combined  company  would have had 860.7 billion
cubic feet of natural gas equivalent of proved reserves (on a pro forma basis as
of year  end  1997).  The  combined  average  daily  production  rate of the two
companies for the first quarter was  approximately  203.2 million cubic feet per
day of natural gas and 22,182 barrels per day of liquid hydrocarbons  (including
crude oil, condensate and natural gas liquids).

      The merger  agreement  provides for a fixed exchange ratio of one share of
Pogo common stock for 10.4 shares of Arch common stock. In addition,  holders of
Arch  preferred  stock will receive one share of Pogo common stock for each 1.04
shares of Arch preferred stock they hold. Former holders of Arch stock will hold
approximately  six  percent of Pogo common  stock  after the  merger.  The total
number of  outstanding  Pogo  shares  after  the  merger  will be  approximately
40,100,000  shares.  Based on Arch's closing price of $2.47 on May 28, 1998, and
the  assumption of  approximately  $48.5  million of Arch's debt and  production
payment  obligations,  the transaction has a total value of  approximately  $115
million.  Although the merger was unanimously approved by the board of directors
of both  Pogo and  Arch,  the  merger  is also  subject  to  approval  by Arch's
shareholders  and to  customary  regulatory  approvals.  Executive  officers and
directors of Arch, Threshold  Development  Corporation and all of the holders of
Arch's preferred stock,  representing  approximately  47% of Arch's  outstanding
stock entitled to vote on the merger at the shareholders  meeting,  have entered
into


                                     1



<PAGE>





agreements  with Pogo  agreeing  to vote in favor of the  merger.  The merger is
expected  to close in the  third  quarter  of 1998  and is also  expected  to be
accounted   for  as  a  pooling  of   interests   and   qualify  as  a  tax-free
reorganization.

      Paul G. Van  Wagenen,  Pogo's  Chairman,  President  and  Chief  Executive
Officer,  said,  "We are very excited about the  opportunity to join forces with
Arch and its  experienced  team of proven  oil  finders.  Arch's  west Texas and
Permian  Basin  properties  and  operations  complement  and  strengthen  Pogo's
existing  operations in our core area there,  providing the combined entity with
substantial synergistic opportunities and additional high-grade locations to add
to our drilling inventory. We believe that Pogo's financial strength will enable
us to more fully and rapidly  exploit Arch's  existing  opportunities  there. In
addition,  we also look forward to integrating Arch's highly successful Canadian
subsidiary    into   our    international    operations.    Its   inventory   of
highly-prospective  Canadian  acreage and  prospects  are just  beginning  to be
explored and developed,  and will provide Pogo with another  international  area
that will  complement  Pogo's existing  successful  operations in the Kingdom of
Thailand,  further diversifying Pogo's international  exploration and production
efforts.  In  addition,  this  combination  also  provides  Pogo with a valuable
entryway into Canadian exploration  opportunities,  which Pogo has been actively
pursuing for some time."

      Larry Kalas,  Arch's  President and Chief Executive  Officer,  said, "This
combination will permit Arch to accelerate the pace and scope of its exploration
efforts,  both in the United States and in Canada. We believe that the financial
strength of the combined entity,  coupled with its significant  upside potential
in  its  domestic  and  international  operations,  will  provide  an  excellent
opportunity  for  shareholders  to  realize  significant  future  value from the
combined entity."

      Pogo Producing Company  primarily  explores for, develops and produces oil
and natural gas.  Headquartered in Houston, Pogo owns interests in 103 (assuming
the  remaining  two high bid tracts  from the recent  federal OCS lease sale are
awarded)  federal and state Gulf of Mexico lease blocks  offshore  Louisiana and
Texas.  After the merger Pogo will own interests in approximately  378,000 gross
leasehold acres in major oil and gas provinces  onshore in the United States and
approximately  734,000 gross acres in the Kingdom of Thailand and  approximately
142,000  gross acres in the  Dominion of Canada.  Pogo common stock is listed on
the New York Stock  Exchanges  under the symbol PPP. Arch common stock is listed
on the NASDAQ National Market System under the symbol ARCH.

      Certain  statements in this news release  regarding  future  expectations,
potential  results  of  the  business   combination,   plans  for  oil  and  gas
exploration,  development  and  production  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 relating to underground
accumulations  of oil and gas as well as other risks  discussed in detail in the
SEC filings of Pogo and Arch,  including the Annual Reports on Form 10-K for the
year ended December 31, 1997. Actual results may vary materially.


                                     2



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission