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                                                                     EXHIBIT 3.1


                       RESTATED ARTICLES OF INCORPORATION
                                       OF
                        TRI-UNION DEVELOPMENT CORPORATION



                                   ARTICLE ONE

         The name of the corporation is Tri-Union Development Corporation.

                                   ARTICLE TWO

         The period of its duration is perpetual.

                                  ARTICLE THREE

         The purpose for which the Corporation is organized is the transaction
of any or all lawful business for which corporations may be incorporated under
the Texas Business Corporation Act.

                                  ARTICLE FOUR

         The aggregate number of authorized shares of capital stock which the
Corporation shall have the authority to issue shall be 510,000 shares, which
shall consist of 445,000 shares of Class A Common Stock, $0.01 par value per
share (as such number may be increased pursuant to this Article Four), and
65,000 shares of Class B Common Stock, $0.01 par value per share. The Class A
Common Stock and the Class B Common Stock are referred to collectively as Common
Stock.

         The number of authorized shares of any class or classes of capital
stock of the Corporation may be increased or decreased (but not below the number
of shares thereof then outstanding) by the affirmative vote of the holders of a
majority of the stock of the Corporation entitled to vote thereon. Except as
otherwise required by law or expressly provided for herein, the powers, rights,
and preferences of the shares of Common Stock and the qualifications,
limitations, or restrictions thereof, shall be in all respects identical.

         No shareholder of the Corporation shall have the right of cumulative
voting at any election of directors or upon any other matter. No holder of
securities of the Corporation shall be entitled as a matter of right, preemptive
or otherwise, to subscribe for or purchase any securities of the Corporation now
or hereafter authorized to be issued, or securities held in the treasury of the
Corporation, whether issued or sold for cash or other consideration or as a
dividend or otherwise. Any such security may be issued or disposed of by the
board of directors to such persons and on such terms as in its discretion it
shall deem advisable.

         The relative rights, powers, preferences, qualifications, limitations,
and restrictions of the Class A Common Stock and the Class B Common Stock shall
be as follows:


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         (a)      Voting Rights.

                  (i)      Each share of Class A Common Stock and each share of
                           Class B Common Stock shall be entitled to one vote at
                           each meeting of the shareholders of the Corporation
                           (and for purposes of written actions of shareholders
                           in lieu of meetings) with respect to any and all
                           matters presented to the shareholders of the
                           Corporation for their action or consideration, and
                           shall be entitled to notice of any shareholders'
                           meeting in accordance with the bylaws of the
                           Corporation. Except as otherwise provided herein or
                           required by law, holders of shares of Class B Common
                           Stock shall vote with the holders of shares of Class
                           A Common Stock and any other class of stock entitled
                           to vote with the holders of Common Stock and not as a
                           separate class. Except as otherwise provided herein
                           or by law, all actions submitted to a vote of the
                           holders of any or all classes of stock of the
                           Corporation shall require the approval of both (i)
                           the holders of a majority of the Class A Common Stock
                           and Class B Common Stock, voting together as a single
                           class, and (ii) the holders of a majority of the
                           Class B Common Stock, voting as a separate class.

                  (ii)     The holders of a majority of the Class B Common
                           Stock, voting as a separate class, shall be entitled
                           to (a) designate one person to serve as a non-voting
                           advisory observer to the Corporation's board of
                           directors, and (b) elect to the board of directors at
                           any time a number of directors sufficient to
                           constitute a majority of the total number of
                           directors. The directors elected by the holders of
                           Class B Common Stock pursuant to this section may
                           only be removed, with or without cause, by the vote
                           of the holders of a majority of the Class B Common
                           Stock.

                  (iii)    In addition to any approval required by law, any
                           amendment to the bylaws of the Corporation shall
                           require the approval of the holders of a majority of
                           the issued and outstanding shares of the Class B
                           Common Stock.

         (b)      Conversion. The Class A Common Stock shall have no conversion
                  rights. Each share of Class B Common Stock shall automatically
                  convert into one fully paid and nonassessable share of Class A
                  Common Stock upon the earliest to occur of:

                  (i)      the disposition of beneficial ownership (as defined
                           in rules promulgated pursuant to the Securities
                           Exchange Act of 1934, as amended) of such share of
                           Class B Common Stock by the holder thereof, unless
                           such disposition was to an affiliate (as defined
                           below) of such holder;

                  (ii)     the repayment, repurchase, or retirement of all of
                           the Series A 12.5% Senior Secured Notes and Series B
                           12.5% Senior Secured Notes issued in exchange
                           therefore of the Corporation issued June 18, 2001
                           (the "Notes"); or


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                  (iii)    the written consent, delivered to the Corporation, by
                           the holders of a majority of the outstanding shares
                           of Class B Common Stock. Such consent shall be given
                           by the holders of Class B Common Stock if (a) the
                           Notes achieve a rating of B or better by Standard &
                           Poor's Ratings Services or B2 or better by Moody's
                           Investors Service, Inc., or (b) the initial purchaser
                           of the Class B Common Stock, together with its
                           affiliates (as defined below), owns beneficially or
                           of record less than ten percent (10%) of the Class B
                           Common Stock originally issued, in each case as
                           determined in good faith by the holders of a majority
                           of the Class B Common Stock.

                  After all authorized shares of Class B Common Stock are
                  originally issued, no subsequent reissuances of Class B Common
                  Stock will occur on account of there being Class B Common
                  Stock available for issuance due to conversion of Class B

                  Common Stock to Class A Common Stock, or repurchase,
                  redemption, or other acquisition of by the Company of shares
                  Class B Common Stock. Each certificate for such converted,
                  repurchased, redeemed, or acquired shares of Class B Common
                  Stock shall be deemed retired and canceled by the Corporation,
                  notwithstanding the failure of the holder thereof to surrender
                  such certificate for cancellation or exchange.

         (c)      Dividend and Liquidation Rights. The holders of Common Stock
                  shall be entitled to receive, when and if declared by the
                  board of directors of the Corporation, dividends, out of the
                  funds legally available therefor, in such amounts as the board
                  of directors may from time to time fix and determine, in its
                  sole and absolute discretion. All dividends or distributions
                  made on the Common Stock shall be made to all holders of
                  Common Stock ratably in proportion to the number of shares of
                  Common Stock then held by them. Upon the liquidation,
                  dissolution, or winding up of the affairs of the Corporation,
                  whether voluntary or involuntary, the holders of Common Stock
                  shall be entitled to receive all assets of the Corporation
                  available for distribution to shareholders, ratably in
                  proportion to the number of shares of Common Stock held by
                  them, after payment or provision for all liabilities and any
                  preferential rights.

         (d)      Co-Sale Provisions. No holder of Common Stock who, together
                  with such holder's affiliates and related persons, owns more
                  than 40% of the issued and outstanding Common Stock (a
                  "Principal Holder"), may transfer any of such shares of Common
                  Stock, directly or indirectly, for value unless and until such
                  holder has complied with the following: The transferring
                  Principal Holder (the "Transferor") must first offer (the
                  "Participation Offer") to include in the proposed transfer a
                  number of shares of Common Stock designated by any shareholder
                  other than the Transferor (each, a "Potential Co-Sale
                  Person"), not to exceed, in respect of any such Potential
                  Co-Sale Person, the product (rounded to the nearest whole
                  share) of (A) the aggregate number of shares of Common Stock
                  to be sold to the proposed transferee (the "Proposed
                  Transferee") and (B) a fraction with the numerator equal to
                  the number of shares of Common Stock owned by such Potential
                  Co-Sale Person and the denominator equal to the number of
                  shares of Common Stock then outstanding.


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                  The Transferor shall give written notice to each Potential
                  Co-Sale Person of the Participation Offer (the "Transferor's
                  Notice"). The Transferor shall deliver such notice to each
                  record holder of shares of Common Stock at the address set
                  forth in the Corporation's records for each such holder. The
                  Transferor's Notice shall be delivered to each record holder
                  of shares at least 30 days (or such longer period as may be
                  required by applicable law) prior to the proposed transfer in
                  a manner reasonably calculated to give prompt notice of such
                  Participation Offer to each beneficial holder of the shares.
                  The Transferor's Notice shall specify the Proposed Transferee,
                  the number of shares of Common Stock to be transferred to such
                  Proposed Transferee, the amount and type of consideration to
                  be received therefor, and the place and date on which the
                  transfer is to be consummated.

                  Each Potential Co-Sale Person who wishes to include Common
                  Stock in the proposed transfer shall so notify the Transferor
                  not more than 15 days after its receipt of the Transferor'S
                  Notice. The Participation Offer shall be conditioned upon the
                  Transferor's transfer of shares pursuant to the transactions
                  contemplated in the Transferor's Notice with the Proposed
                  Transferee named therein. If any Potential Co-Sale Person has
                  accepted the Participation Offer, the Transferor shall reduce
                  to the extent necessary the number of shares of Common Stock
                  it otherwise would have sold in the proposed transfer so as to
                  permit each Potential Co-Sale Person to sell the number of
                  shares that it is entitled to sell under these provisions, and
                  the Transferor and each Potential Co-Sale Person shall
                  transfer the number of shares specified in the Participation
                  Offer to the Proposed Transferee in accordance with the terms
                  set forth in the Transferor's Notice (it being acknowledged
                  that in no event shall the Transferor be obligated to transfer
                  any securities). For purposes of the foregoing provisions,
                  Class A Common Stock and Class B Common Stock will be treated
                  equally.

                  The shares to be sold shall be transferred by the Transferor
                  and each participating Potential Co-Sale Person to the
                  transferee at the headquarters of the Corporation by the
                  surrender for transfer of such shares to the Company or the
                  transferee against payment of the purchase price therefor in
                  immediately available funds to accounts designated by the
                  Transferor and each Potential Co-Sale Person. The closing of
                  such transfer shall be on the same date that the transferee
                  acquires shares from the Transferor, but in no event shall the
                  Transferor transfer shares prior to fifteen (15) days after
                  giving notice of such closing date to each Potential Co-Sale
                  Person. Each participating Potential Co-Sale Person shall not
                  be required to make any representations or warranties in
                  connection with such transfer other than representations and
                  warranties as to (i) ownership of the shares to be transferred
                  by such Potential Co-Sale Person free and clear of all liens,
                  claims and encumbrances, (ii) such person's power and
                  authority to effect such transfer, and (iii) such matters
                  pertaining to compliance with applicable securities laws as
                  the transferee may reasonably require. To the extent that any
                  prospective transferee prohibits such assignment or otherwise
                  refuses to purchase shares from any participating Potential


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                  Co-Sale Person, the Transferor shall not sell to such
                  prospective transferee any shares unless and until,
                  simultaneously with such sale, the Transferor shall have
                  purchased the shares to be sold by the participating Potential
                  Co-Sale Persons for the same price set forth in the
                  Transferor's Notice.

                  As used herein, "transfer" means any direct or indirect,
                  transfer, assignment, sale, gift, pledge, hypothecation or
                  other encumbrance, or any other disposition (whether voluntary
                  or involuntary or by operation of law), including without
                  limitation derivative or similar transactions or arrangements
                  whereby a portion or all of the economic interest in, or risk
                  of loss or opportunity for gain with respect to, Common Stock
                  is transferred or shifted to another party; provided, however,
                  that an exchange, merger, recapitalization, consolidation or
                  reorganization involving the Corporation in which securities
                  of the Corporation or any other party are issued in respect of
                  shares of the Common Stock shall not be deemed a transfer if
                  all shares of Common Stock are treated identically in such
                  transaction. As used herein, "related person" means with
                  respect to any person, (i) such person's parents, grandparents
                  or the lineal descendant of any parent or grandparent (in each
                  case whether by birth or adoption, in law or otherwise), (ii)
                  any spouse of any of the persons described in (i) above, (iii)
                  any substantial business relation of such person, and (iv) any
                  person or entity that acquires shares of Common Stock from
                  such person by will, devise or intestate succession or by any
                  other means that is not an arms-length transaction for fair
                  value. As used herein, "affiliate" means, with respect to a
                  specified person, any person that directly or indirectly
                  through one or more intermediaries controls, is controlled by
                  or is under common control with the specified person.

                  The foregoing co-sale provision will terminate when none of
                  the Class B Common Stock remains outstanding.

         (e)      Recapitalization, Reorganization, Etc. In the event of a share
                  split, subdivision, combination, reorganization,
                  reclassification or other similar transaction as a result of
                  which the shares of any class of Common Stock are split,
                  subdivided, combined, reorganized, reclassified or converted
                  into another security, or a consolidation, merger, combination
                  or other transaction in which the shares of any class of
                  Common Stock are exchanged for or changed into other stock or
                  securities, then each class of Common Stock shall be treated
                  equally in such event or transaction.

                                  ARTICLE FIVE

         The Corporation will not commence business until it has received for
the issuance of its shares consideration of the value of one thousand dollars
($1,000) consisting of money, labor done, or property actually received.

                                   ARTICLE SIX

         The street address of the registered office of the Corporation is 530
Lovett Boulevard, Houston, Texas 77006-4021, and the name of the registered
agent of the Corporation at that address is Richard Bowman.


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                                  ARTICLE SEVEN

         The current number of Directors constituting the board of directors is
one. The name and address of the person who is serving as a director until the
next annual or special meeting of the shareholders or until his successor is
elected and qualified is:

         Richard Bowman
         530 Lovett Boulevard
         Houston, Texas 77006-4021

                                  ARTICLE EIGHT

         Pursuant to Article 9.10.A of the Texas Business Corporation Act, any
action required to be taken at any annual or special meeting of shareholders, or
any action which may be taken at any annual or special meeting of shareholders,
may be taken without a meeting, without prior notice, and without a vote, if a
consent or consents in writing, setting forth the action so taken, shall have
been signed by the holder or holders of shares having not less than the minimum
number of votes would be necessary to take such action at a meeting which the
holders of all shares entitled to vote on the action were present and voted.

                                  ARTICLE NINE

         To the fullest extent permitted by Texas statutes, as the same exist or
may hereafter be amended (but, in the case of any such amendment, only to the
extent that such amendment permits broader limitations than permitted prior to
such amendment), a director of the Corporation shall not be liable to the
Corporation or its shareholders for monetary damages for an act or omission in
the director's capacity as a director. Any repeal or amendment of this Article
by the shareholders of the Corporation shall be prospective only, and shall not
adversely affect any limitation on the personal liability of a director of the
Corporation existing at the time of such repeal or amendment.

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                  IN WITNESS WHEREOF, the undersigned has executed these Amended
and Restated Articles of Incorporation on behalf of the Corporation as of the
____ day of July, 2001.


                                            ------------------------------------
                                            Richard Bowman, President