ARCH PETROLEUM INC /NEW/
SC 13D/A, 1998-06-05
DRILLING OIL & GAS WELLS
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<PAGE>

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



                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934

                               (Amendment No. 4 )*
                                             ---


                               ARCH PETROLEUM INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          COMMON STOCK, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)



                                    03939B105
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                               Kathryn Pietrowiak
      CIGNA Corporation, 900 Cottage Grove Road, Bloomfield, CT 06152-2215
                                 (860) 726-8908
- --------------------------------------------------------------------------------
 (Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)


                                  May 28, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)



If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[ X ].

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7(b) for other
parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).




                               Page 1 of 27 Pages

<PAGE>



                                  SCHEDULE 13D

- -----------------------------                      -----------------------------
CUSIP NO. 03939B105                                Page  2   of   27   Pages
          -------------------
- -----------------------------                      -----------------------------


- --------------------------------------------------------------------------------
1         NAME OF REPORTING PERSON
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only)

          CIGNA Corporation
          06-1059331

- --------------------------------------------------------------------------------
2         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) _
                                                                        (a)  |_|
                                                                              _
                                                                        (b)  |_|
- --------------------------------------------------------------------------------
3         SEC USE ONLY

- --------------------------------------------------------------------------------
4         SOURCE OF FUNDS (See Instructions)

          00
- --------------------------------------------------------------------------------
5         CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS
                          _
          2(d) or 2(e)   |_|

- --------------------------------------------------------------------------------
6         CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware

- --------------------------------------------------------------------------------
                            7       SOLE VOTING POWER

                                    0
            NUMBER OF       ----------------------------------------------------
             SHARES         8       SHARED VOTING POWER
          BENEFICIALLY
            OWNED BY                3,636,360
              EACH          ----------------------------------------------------
            REPORTING       9       SOLE DISPOSITIVE POWER
             PERSON
              WITH                  0
                            ----------------------------------------------------
                            10      SHARED DISPOSITIVE POWER

                                    3,636,360
- --------------------------------------------------------------------------------
11        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          3,636,360
- --------------------------------------------------------------------------------
                                                                              _
12        CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES  |_|
                                                      (See Instructions)

- --------------------------------------------------------------------------------
13        PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          17.4%
- --------------------------------------------------------------------------------
14        TYPE OF REPORTING PERSON (See Instructions)

          HC, CO
- --------------------------------------------------------------------------------



<PAGE>



This Amendment No. 4 to the Schedule 13D dated October 31, 1994, as amended by
Amendment No. 1 dated February 16, 1995, Amendment No. 2 dated January 9, 1998,
and Schedule 13G dated April 6, 1998, hereby amends Items 4 through 7 and
Appendix A of such Schedule 13D to the extent and in the manner set forth below.
Unless otherwise indicated, all capitalized terms used but not defined herein
shall have the meaning set forth in such Schedule 13D.


ITEM 4.  PURPOSE OF TRANSACTION.

The second paragraph of Item 4 is deleted in its entirety and replaced with the
following paragraph:

         Connecticut General and CMP have entered into, and CII has caused
Lincoln to enter into, separate Stockholder Agreements dated as of May 28, 1998
(each, a "Stockholder Agreement" and together, the "Stockholder Agreements"),
substantially identical in form, with Pogo Producing Company, a Delaware
corporation ("Pogo"), which set forth the agreement of Connecticut General, CMP
and Lincoln to vote their respective securities of the Issuer reported in this
Schedule 13D in favor of the approval of a merger transaction through which the
Issuer would become a wholly-owned subsidiary of Pogo. Pursuant to such merger
transaction, holders of the Issuer's Common Stock (including holders of shares
of Common Stock received upon conversion of the Series A Notes and the Series B
Notes at the effective time of the merger) would receive one share of Pogo
common stock for each 10.4 shares of their Common Stock and holders of the
Issuer's Convertible Preferred Stock would receive one share of Pogo common
stock for each 1.04 shares of their Convertible Preferred Stock. CIGNA has been
informed by the Issuer that such merger transaction, which is subject to
approval by the Issuer's shareholders and to customary regulatory approvals, has
been unanimously approved by the boards of directors of both the Issuer and
Pogo.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

Item 5 is hereby amended and restated in its entirety as follows:

         (a) CIGNA, through its ownership and control of the CIGNA Subsidiaries,
may be deemed to be the beneficial owner of the following numbers of shares of
Common Stock, representing the following respective percentages of the
outstanding shares of Common Stock:
<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
                                                                           Right to Acquire
                                            Shares Held at                 Shares within 60
                                            5/28/98                        days of 5/28/98                    Percentage of Class
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                      <C>                                  <C> 
Connecticut General shares                              0                          497,834                             2.4%
- ------------------------------------------------------------------------------------------------------------------------------------
CMP shares                                              0                        2,343,271                            11.2%
- ------------------------------------------------------------------------------------------------------------------------------------
Managed Securities                                      0                          795,255                             3.8%
- ------------------------------------------------------------------------------------------------------------------------------------
Aggregate                                               0                        3,636,360                            17.4%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(For purposes of the foregoing calculations of percentage ownership, the number
of outstanding shares of Common Stock used was 20,958,164, consisting of the
17,321,804 shares outstanding on April 30, 1998, as reported in the Issuer's
report on Form 10-Q for the quarter ended March 31, 1998, increased by the
3,636,360 shares subject to acquisition as shown above.)


                               Page 3 of 27 Pages

<PAGE>



         (b) Pursuant to the Certificate of Designation, the holders of shares
of Convertible Preferred Stock have equal voting rights, on an as converted
basis, with every outstanding share of Common Stock and each holder of
Convertible Preferred Stock is entitled to one vote for each share of Common
Stock, on an as converted basis, into which such Convertible Preferred Stock is
at the time convertible on each matter on which the holders of Common Stock are
entitled to vote. By virtue of its ownership of 39,829.5 shares of Convertible
Preferred Stock, Connecticut General presently has the power to vote or direct
the voting of 398,295 shares of Common Stock. By virtue of its ownership of
187,454.5 shares of Convertible Preferred Stock, CMP presently has the power to
vote or direct the voting of 1,874,545 shares of Common Stock. CII presently has
the power to vote or direct the voting of 636,250 shares of Common Stock by
virtue of the 63,625 shares of Convertible Preferred Stock that constitute
Managed Securities. CIGNA, through its control of the CIGNA Subsidiaries, may be
deemed presently to share the power to vote or direct the voting of 2,909,090
shares of Common Stock.

         Assuming conversion of their Series A Notes and Series B Notes,
Connecticut General and CMP would have the power to vote or direct the voting of
497,834 shares and 2,343,271 shares of Common Stock, respectively. Assuming
conversion of the Series A Notes and Series B Notes that constitute Managed
Securities, CII would have the power to vote or direct the voting of 795,255
shares of Common Stock. Accordingly, CIGNA, through its control of the CIGNA
Subsidiaries, could be deemed to share the power to vote or direct the voting of
any or all of the 3,636,360 shares of Common Stock that would then be
beneficially owned by them. Assuming conversion of the shares of Convertible
Preferred Stock and Series A Notes and Series B Notes: Connecticut General and
CMP would have the power to dispose of or direct the disposition of 497,834
shares and 2,343,271 shares of Common Stock, respectively; CII would have the
power to dispose of or direct the disposition of 795,255 shares of Common Stock
as Managed Securities; and CIGNA, through its control of the CIGNA Subsidiaries,
could be deemed to share the power to dispose of or direct the disposition of
any or all of the 3,636,360 shares of Common Stock that would then be
beneficially owned them.

         In this subsection (b), references to Connecticut General should be
deemed to include its investment adviser, CIAC, which has voting and dispositive
power with respect to Connecticut General's shares of Common Stock, and
references to CMP or the General Partner should be deemed to include CMP's
investment adviser, CII, which has voting and dispositive power with respect to
CMP's shares of Common Stock.

         (c) To the best of CIGNA's knowledge, no transactions in the Common
Stock were effected in the past 60 days by persons named in Item 2 above.

         (d) No person other than those named in the response to Item 2 above,
or Lincoln and/or its affiliates with respect to the Managed Securities, will
have the right to receive or the power to direct the receipt of dividends from,
or the proceeds from the sale of, any of the shares of Common Stock referred to
herein.

         (e) Not applicable.



                               Page 4 of 27 Pages

<PAGE>



ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER.

The following paragraphs are added at the end of Item 6:

         The information provided in Item 4 above relating to the Stockholder
Agreements is incorporated herein by reference. Under the Stockholder
Agreements, each of Connecticut General, CMP and Lincoln has agreed (1) not to
solicit or encourage any prospective alternative proposal for acquisition of the
Issuer and (2) not to sell or otherwise dispose of any of its Convertible
Preferred Stock, Notes or Common Stock acquired upon conversion of the
Convertible Preferred Stock or Notes or otherwise. According to its terms, each
Stockholder Agreement will terminate upon the termination of the agreement of
merger between the Issuer and Pogo and may be terminated by Connecticut General,
CMP or Lincoln, as the case may be, if the effective time of the merger fails to
occur by November 30, 1998, or if certain provisions of the agreement of merger
between the Issuer and Pogo, relating to the ratios for exchange of securities
in the merger and cancellation of the Issuer's treasury stock and to the listing
and saleability of Pogo common stock received in the merger, are amended or
waived without the consent of Connecticut General, CMP or Lincoln, as the case
may be.

         The Stockholder Agreement between CMP and Pogo and the Stockholder
Agreement between Connecticut General and Pogo are attached hereto as Exhibits 5
and 6, respectively, and are incorporated herein by reference, and any
description of such Stockholder Agreements in the items of this Schedule is
qualified in its entirety by reference to such Agreements.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

The following is added at the end of Item 7:

              Exhibit 5 -- Stockholder Agreement (CIGNA Mezzanine Partners III,
                           L.P.) dated as of May 28, 1998, between Pogo
                           Producing Company and CIGNA Mezzanine Partners III,
                           L.P.

              Exhibit 6 -- Stockholder Agreement (Connecticut General Life
                           Insurance Company) dated as of May 28, 1998, between
                           Pogo Producing Company and Connecticut General Life
                           Insurance Company


SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Dated:  June 5, 1998

                                           CIGNA CORPORATION


                                           By: /s/ Kathryn Pietrowiak
                                              ----------------------------------
                                               Kathryn Pietrowiak,
                                               Assistant Corporate Secretary



                               Page 5 of 27 Pages

<PAGE>



APPENDIX A to Schedule 13D is amended and restated in its entirety as follows:


                                CIGNA CORPORATION
                        DIRECTORS AND EXECUTIVE OFFICERS
        (ALL DIRECTORS AND EXECUTIVE OFFICERS ARE UNITED STATES CITIZENS)

DIRECTORS
- ---------

NAME                     RESIDENCE OR                  PRINCIPAL OCCUPATION
                         BUSINESS ADDRESS

ROBERT P. BAUMAN         BTR, PLC                      Chairman
                         BTR House
                         Carlisle Place
                         London, SWIP IBX
                         England

ROBERT H. CAMPBELL       Sun Company Inc.              Chairman and
                         1801 Market Street            Chief Executive Officer
                         Philadelphia, PA 19103
                                               
ALFRED C. DeCRANE, JR.   Texaco Inc.                   Retired Chairman of the
                         c/o Carol J. Ward             Board and Chief Executive
                         CIGNA Corporation             Officer
                         1650 Market Street
                         Philadelphia, PA 19192-1550

PETER N. LARSON          Brunswick Corporation         Chairman, President and
                         One North Field Court         Chief Executive Officer
                         Lake Forest, IL 60045

MARILYN W. LEWIS         American Water Works          Chairman
                           Company, Inc.
                         2 East Main Street
                         Strasburg, PA 17579

CHARLES R. SHOEMATE      Bestfoods                     Chairman, President and
                         International Plaza           Chief Executive Officer
                         Englewood Cliffs, NJ 07632

LOUIS W. SULLIVAN, M.D.  Morehouse School of           President
                           Medicine
                         720 Westview Drive
                         Atlanta, GA 30314

WILSON H. TAYLOR         CIGNA Corporation             Chairman of the Board,
                         One Liberty Place             President and
                         1650 Market Street            Cheif Executive Officer
                         Philadelphia, PA 19192-1550

HAROLD A. WAGNER         Air Products and Chemicals,   Chairman, President and
                           Inc.                        Chief Executive Officer
                         7201 Hamilton Blvd.
                         Allentown, PA 18195-1501

CAROL COX WAIT           Committee for a Responsible   Director, President and
                           Federal Budget              Chief Executive Officer
                         220-1/2 (E) Street, N.E.
                         Washington, DC 20002



                               Page 6 of 27 Pages

<PAGE>






EXECUTIVE OFFICERS
- ------------------


NAME                     RESIDENCE OR
                         BUSINESS ADDRESS              PRINCIPAL OCCUPATION

WILSON H. TAYLOR         One Liberty Place             Chairman, President and
                         1650 Market Street            Chief Executive Officer
                         Philadelphia, PA 19192-1550

H. EDWARD HANWAY         900 Cottage Grove Road        President
                         Hartford, CT 06152-1216       CIGNA HealthCare

GERALD A. ISOM           Two Liberty Place             President
                         1601 Chestnut Street          CIGNA Property & Casualty
                         Philadelphia, PA 19192-2451

THOMAS C. JONES          900 Cottage Grove Road        President
                         Hartford, CT 06152-2211       CIGNA Investment
                                                       Management

JOHN K. LEONARD          Two Liberty Place             President
                         1601 Chestnut Street          CIGNA Group Insurance:
                         Philadelphia, PA 19192-2240   Life, Accident,
                                                       Disability

DONALD M. LEVINSON       One Liberty Place             Executive Vice President
                         1650 Market Street            Human Resources and
                         Philadelphia, PA 19192-1550   Services

FRANCINE M. NEWMAN       900 Cottage Grove Road        President
                         Hartford, CT 06152-4026       CIGNA Reinsurance

BYRON D. OLIVER          One Commercial Plaza          President
                         280 Trumbull Street           CIGNA Retirement &
                         Hartford, CT 06103            Investment Services

B. KINGSLEY SCHUBERT     Two Liberty Place             President
                         1601 Chestnut Street          CIGNA International
                         Philadelphia, PA 19192-2531

JAMES G. STEWART         One Liberty Place             Executive Vice President
                         1650 Market Street            and Chief Financial
                         Philadelphia, PA 19192-1550   Officer

THOMAS J. WAGNER         One Liberty Place             Executive Vice President
                         1650 Market Street            and General Counsel
                         Philadelphia, PA 19192-1550   CIGNA Legal & Public
                                                       Affairs



                               Page 7 of 27 Pages

<PAGE>


                                                                       EXHIBIT 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"),  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

                               Page 8 of 27 Pages

<PAGE>



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.


                               Page 9 of 27 Pages

<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.




                               Page 10 of 27 Pages

<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  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 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.

                               Page 11 of 27 Pages

<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.



                               Page 12 of 27 Pages

<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

                               Page 13 of 27 Pages

<PAGE>



              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
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

                               Page 14 of 27 Pages

<PAGE>



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]


                               Page 15 of 27 Pages

<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
                                           -------------------------------------
                                         Name     Thomas P. Shea
                                         Title    Vice President


                                         POGO PRODUCING COMPANY


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



                               Page 16 of 27 Pages

<PAGE>



                                  SCHEDULE 2.01


1.       None



                               Page 17 of 27 Pages

<PAGE>



                                                                       EXHIBIT 6




                              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 Termination Date,
or in connection

                               Page 18 of 27 Pages

<PAGE>



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.

                               Page 19 of 27 Pages

<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.

              (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.


                               Page 20 of 27 Pages

<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 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.

              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.

                               Page 21 of 27 Pages

<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.



                               Page 22 of 27 Pages

<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:

              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

                               Page 23 of 27 Pages

<PAGE>



              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
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


                               Page 24 of 27 Pages

<PAGE>



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]













                               Page 25 of 27 Pages

<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
                                                 -------------------------------
                                               Name     Thomas P. Shea
                                               Title    Vice President


                                               POGO PRODUCING COMPANY


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


                               Page 26 of 27 Pages

<PAGE>



                                  SCHEDULE 2.01


1.       None





                               Page 27 of 27 Pages




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