Exhibit 3.1


                              CERTIFICATE OF DESIGNATION
                                          of
                               SERIES B PREFERRED STOCK
                                          of
                               3TEC ENERGY CORPORATION

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

                               Pursuant to Section 151
                      of the General Corporation Law of Delaware

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


       3TEC ENERGY CORPORATION, a corporation existing under the laws of the
State of Delaware (the "Corporation"), DOES HEREBY CERTIFY that, pursuant to the
authority conferred on the Board of Directors of the Corporation by the
Certificate of Incorporation of the Corporation (the "Certificate of
Incorporation") and in accordance with Section 151 of the General Corporation
Law of the State of Delaware ("DGCL"), the Board of Directors of the Corporation
on October 1, 1999 duly adopted the following resolution establishing and
creating a series of its Preferred Stock, par value $.02 per share, designated
"Series B Preferred Stock".

              RESOLVED, that pursuant to authority vested in the Board of
       Directors of the Corporation (the "Board of Directors") in accordance
       with the provisions of its Certificate of Incorporation (the "Certificate
       of Incorporation"), a series of Preferred Stock, par value $.02 per
       share, of the Corporation is hereby created, and the designation and
       number of shares thereof and the preferences, limitations and relative
       rights thereof are as follows:

       1.     DESIGNATION, NUMBER OF SHARES AND STATED VALUE OF SERIES B
PREFERRED STOCK.  There is hereby authorized and established a series of
Preferred Stock that shall be designated as "Series B Preferred Stock", and the
number of shares constituting such series shall be 266,667.  Such number may be
increased or decreased, but not to a number less than the number of shares of
Series B Preferred Stock then issued and outstanding, by resolution adopted by
the full Board of Directors.  The "stated value" of the Series B Preferred Stock
shall be $7.50 per share.

       2.     CERTAIN DEFINITIONS.

       "COMMON STOCK" means, collectively, the Corporation's Common Stock, par
value $.02 per share, and any capital stock of any class of the Corporation
hereafter authorized



which is not limited to a fixed sum or percentage of par or stated value in
respect to the rights of the holders thereof to participate in dividends or
in the dissolution of assets upon any liquidation, dissolution or winding up
of the Corporation.

       "JUNIOR SECURITIES" means any of the Corporation's equity securities
other than the Series B Shares.

       "LIQUIDATION VALUE" of any Series B Share as of any particular date will
be equal to the sum of $7.50 plus, in the event of any liquidation, dissolution
or winding up of the Corporation, any declared but unpaid dividends on such
Series B Share shall be added to the Liquidation Value of such Share on the
payment date in any liquidation, dissolution or winding up accrued to the close
of business on such payment date.

       "PERSON" means an individual, a partnership, a corporation, an
association, a joint stock company, a trust, a joint venture, an unincorporated
organization and a governmental entity or any department, agency or political
subdivision thereof.

       "SERIES B SHARE" means a share of the Series B Preferred Stock.


       3.     DIVIDENDS; CAPITAL.

              A.     GENERAL.  When and as declared by the Corporation's Board
                     of Directors and only to the extent permitted under the
                     DGCL, the Corporation may, but is not required to, pay
                     dividends to the holders of its Series B Preferred Stock;
                     however, the Corporation shall not be restricted from
                     declaring and paying dividends to the holders of any Junior
                     Securities out of funds lawfully available for payment of
                     such dividends.

              B.     CAPITAL.  Upon issuance of any Series B Preferred Stock,
                     the entire consideration received therefor shall be
                     allocated to the "capital" of the Corporation, and the
                     Corporation shall take no action to reduce its capital in
                     respect of the Series B Preferred Stock below the
                     Liquidation Value of all outstanding Series B Preferred
                     Stock.


       4.     LIQUIDATION.  Upon any liquidation, dissolution or winding up of
the Corporation, subject to the conversion rights set forth in Paragraph 5.
hereof, the holders of Series B Shares will be entitled to be paid, before any
distribution or payment is made upon any Junior Securities, an amount in cash
equal to the Liquidation Value (including the amount of declared but unpaid
dividends, if any) of all Series B Shares outstanding.  If, upon any such
liquidation, dissolution or winding up of the Corporation, the Corporation's
assets to be distributed among the holders of the Series B Shares are
insufficient to permit payment to such holders of the aggregate amount which
they are entitled to be paid, then the entire assets to be distributed in
respect of such Series B Shares will be distributed ratably among such holders
based upon the Liquidation Value of the Series B Shares held by each such
holder.  The Corporation will mail written notice of such liquidation,
dissolution or winding up not less than 60 days prior to the payment date stated
therein, to each record holder of Series B Shares.  Neither the consolidation or
merger of the



Corporation into or with any other corporation or corporations, the sale or
transfer by the Corporation of all or any part of its assets nor the
reduction of the capital stock of the Corporation will be deemed to be a
liquidation, dissolution or winding up of the Corporation within the meaning
of this Paragraph 4.

       5.     CONVERSION.

              A.     CONVERSION BY HOLDER.

                     (1)    Until December 31, 2002 (the "Conversion Period"),
                            any holder of Series B Shares may convert all or any
                            portion of the Series B Shares held by such holder
                            into shares of Common Stock (i) at a ratio of one
                            share of Common Stock for each Series B Share or
                            (ii) pursuant to the Alternative Conversion Method
                            based on Cumulative Value, as described and defined
                            in and in accordance with Section 2.9 of that
                            certain Agreement and Plan of Merger dated June 20,
                            1997 among Middle Bay Oil Company, Inc., Shore
                            Acquisition Company, Shore Oil Company and its
                            shareholders, which Section 2.9 is incorporated
                            herein.

                     (2)    Upon the expiration of the Conversion Period, unless
                            the Corporation has given prior notice of intent to
                            redeem the Series B Shares pursuant to Paragraph 7.,
                            all outstanding Series B Shares shall be
                            automatically converted pursuant to
                            Paragraph 5.A(1)(i) or 5.A(2)(ii), whichever
                            provides for a greater conversion ratio.

                     (3)    Any conversion will be deemed effected (i) at the
                            close of business on the date which the certificate
                            or certificates representing the Series B Shares to
                            be converted have been delivered by the holder to
                            the Corporation at its principal office, together
                            with a request for conversion of such Series B
                            Shares, or (ii) upon the last day of the Conversion
                            Period if the Series B Shares are converted pursuant
                            to Paragraph 5.A(2)(ii).

                     (4)    In no event shall the aggregate total number of
                            Shares of Common Stock into which the Series B
                            Shares are converted exceed



                            1,333,333 Shares (except as that number may be
                            adjusted pursuant to Paragraph 6).

              B.     CONVERSION PROCEDURES.

                     (1)    At such time as a conversion has been effected, the
                            rights of the holder of such Series B Shares as such
                            holder will cease and the Person or Persons in whose
                            name or names any certificate or certificates for
                            shares of Common Stock are to be issued upon such
                            conversion will be deemed to have become the holder
                            or holders of record of the shares of Common Stock
                            represented thereby.

                     (2)    As soon as possible after a conversion has been
                            effected, the Corporation will deliver to the holder
                            of Series B Shares being converted:

                            a.     A certificate or certificates representing
                                   the number of shares of Common Stock issuable
                                   by reason of such conversion in such name or
                                   names and such denomination or denominations
                                   as the converting holder has specified; and

                            b.     A certificate representing any Series B
                                   Shares which were represented by the
                                   certificate or certificates delivered to the
                                   Corporation in connection with such
                                   conversion but which were not converted.

                     (3)    The issuance of certificates for shares of Common
                            Stock upon conversion of Series B Shares will be
                            made without charge to the holders of such Series B
                            Shares for any issuance tax in respect thereof or
                            other cost incurred by the Corporation in connection
                            with such conversion and the related issuance of
                            shares of Common Stock.  Upon conversion of each
                            Series B Share, the Corporation will take all such
                            actions as are necessary in order to insure that the
                            Common Stock issuable with respect to such
                            conversion will be validly issued, fully paid and
                            nonassessable.

                     (4)    The Corporation will not close its books against the
                            transfer of Series B Shares or of Common Stock
                            issued or issuable upon conversion of Series B
                            Shares in any manner which interferes with the
                            timely conversion of Series B Shares.



       6.     ANTI-DILUTION PROVISIONS.  In the event that the Common Stock
hereafter is changed into or exchanged for a different number or kind of shares
or other securities of the Corporation or of another corporation by reason of
merger, consolidation, other reorganization, recapitalization, reclassification,
combination of shares, stock split-up or stock dividend:

              A.     The aggregate number and kind of shares subject to the
                     conversion rights granted hereunder shall be adjusted
                     appropriately;

              B.     Conversion rights granted hereunder, both as to the number
                     of subject Series B Shares and the Cumulative Value, shall
                     be adjusted appropriately;

              C.     Where dissolution or liquidation of the Corporation or any
                     merger or combination in which the Corporation is not a
                     surviving corporation is involved, each outstanding
                     conversion right granted hereunder shall terminate, but the
                     holder shall have the right, immediately prior to such
                     dissolution, liquidation, merger or combination, to
                     exercise his conversion right, in whole or in part, to the
                     extent that it shall not have been exercised; and

              D.     Such new or additional or different shares or securities
                     which are distributed to holder, in his capacity as the
                     owner of Common Stock issued pursuant to the conversion
                     rights granted hereunder, shall be subject to all of the
                     conditions and restrictions applicable to the Common Stock
                     issuable hereunder.

       The foregoing adjustments and the manner of application of the foregoing
provisions shall be determined solely by the Corporation, and any such
adjustment may provide for the elimination of fractional share interests.


       7.     OPTIONAL REDEMPTION.

              A.     Subject to prior exercise of conversion rights by the
                     holder during the Conversion Period, the Series B Preferred
                     Stock may be redeemed, in whole or in part, upon notice
                     given as provided in Paragraph 7.B. (but subject to the
                     terms and conditions hereinafter set forth), at the option
                     of the Corporation, at any time and from time to time after
                     December 31, 2002, at a redemption price of $7.50 per
                     Share, together with any dividends declared and unpaid
                     thereon to the date of redemption (the "Redemption Price"),
                     so long as funds are legally available for such redemption.

              B.     If pursuant to Paragraph 7.A. the Corporation shall redeem
                     any shares of Series B Preferred Stock, the Corporation
                     shall give written notice of such redemption to each holder
                     of record of Series B Shares to be redeemed not less than
                     thirty (30) nor more than ninety (90) days prior to the
                     date fixed for redemption, by certified mail enclosed in a
                     postage-paid envelope addressed to such holder at such
                     holder's address as the



                     same shall appear on the books of the Corporation.  Such
                     notice shall (i) state that the Corporation has elected
                     to redeem such Series B Shares, (ii) state the date
                     fixed for redemption, (iii) state the Redemption Price
                     and (iv) call upon such holder to surrender to the
                     Corporation on or after said date at its principal place
                     of business designated in such notice a certificate or
                     certificates representing the number of Series B Shares
                     to be redeemed in accordance with such notice.  On or
                     after the date fixed in such notice for redemption, each
                     holder of shares of Series B Preferred Stock to be so
                     redeemed shall present and surrender the certificate or
                     certificates for such Series B Shares to the Corporation
                     at the place designated in said notice, and thereupon
                     the Redemption Price of such Series B Shares shall be
                     paid to, or to the order of, the Person whose name
                     appears on such certificate or certificates as the owner
                     thereof.  From and after the date fixed in any such
                     notice as the date for redemption, unless default shall
                     be made by the Corporation in providing for the payment
                     of the Redemption Price pursuant to such notice, all
                     rights of the holders of the Series B Shares so redeemed,
                     except the right to receive the Redemption Price (but
                     without interest thereon), shall cease and terminate.
                     If less than all of the outstanding Series B Shares are
                     to be redeemed, the Series B Shares to be redeemed shall
                     be allocated among the holders thereof in proportion to
                     the respective number of Series B Shares held by them.

              C.     Any Series B Shares redeemed by the Corporation shall be
                     retired.


       8.     COVENANTS OF CORPORATION.  So long as any of the Series B Shares
are outstanding, the Corporation shall do all of the following (the
"Covenants"):

              A.     Maintain its corporate existence in good standing;

              B.     Maintain the general character of its business and conduct
                     its business in its ordinary and usual manner;

              C.     Maintain proper business and accounting records;

              D.     Comply with and perform all material obligations and duties
                     imposed upon it by federal, state and local laws and all
                     rules, regulations and orders imposed by federal, state or
                     local governmental authorities, except as may be contested
                     by them in good faith by appropriate proceedings;

              E.     Deliver to the holders of the Series B Preferred Shares,
                     within the times required for the filing of SEC Forms 10-K
                     and 10-Q, true and correct copies of the annual and
                     quarterly financial statements of the Corporation, which
                     statements shall be prepared in compliance with the Rules
                     and Regulations of the Securities and Exchange Commission;

              F.     Comply with all financial covenants in all loan agreements
                     or credit



                     facilities to which the Corporation is a party; and

              G.     Timely make all filings and submit all reports required by
                     the Rules and Regulations of the Securities and Exchange
                     Commission.


       9.     VOTING RIGHTS.  The holders of the Series B Preferred Stock shall
have no voting rights, other than those rights afforded to them by law.

       10.    NOTICES.  Except as otherwise expressly provided, all notices
referred to herein will be in writing and will be deemed to have been given
either when delivered personally or three business days after having been mailed
by registered or certified mail, return receipt requested, postage prepaid (i)
to the Corporation, at its principal executive offices, and (ii) to any
stockholder, at such holder's address as it appears in the stock records of the
Corporation (unless otherwise indicated by any such holder).

       11.    REMEDIES.  The remedies afforded the holders of Series B Shares in
this Certificate of Designation are cumulative and not sole or exclusive.

       12.    CONFLICT WITH OTHER PROVISIONS.  In the event of any conflict
between the provisions of this Certificate of Designation and any other
provisions of the Certificate of Incorporation, then the provisions of this
Certificate of Designation shall govern and control.

              RESOLVED FURTHER, that the appropriate officers of the Corporation
       be, and they are hereby, authorized and directed from time to time to
       execute such certificates, instruments or other documents and do all such
       things as may be necessary or advisable in their discretion in order to
       carry out the terms hereof, including the filing with the Secretary of
       State for the State of Delaware of a copy of the foregoing resolution
       executed by an officer of the Corporation.



Dated November 24, 1999.

                                          3TEC ENERGY CORPORATION



                                          By: /s/ Floyd C. Wilson
                                          Name: Floyd C. Wilson
                                          Title: President