Exhibit 3.1















                           AMENDED AND RESTATED BYLAWS

                                       OF

                        PIONEER NATURAL RESOURCES COMPANY


                             A Delaware Corporation






                                TABLE OF CONTENTS

                                                                       Page

                              ARTICLE ONE: OFFICES

1.1      Registered Office and Agent....................................1
1.2      Other Offices..................................................1

                      ARTICLE TWO: MEETINGS OF STOCKHOLDERS

2.1      Annual Meeting.................................................1
2.2      Special Meeting................................................1
2.3      Place of Meetings..............................................2
2.4      Notice.........................................................2
2.5      Voting List....................................................2
2.6      Quorum.........................................................2
2.7      Required Vote; Withdrawal of Quorum............................3
2.8      Method of Voting; Proxies......................................3
2.9      Record Date....................................................3
2.10     Conduct of Meeting.............................................4
2.11     Inspectors.....................................................4

                            ARTICLE THREE: DIRECTORS

3.1      Management.....................................................4
3.2      Number; Election; Classification; Term; Qualification..........4
3.3      Change in Number...............................................5
3.4      Removal........................................................5
3.5      Vacancies......................................................6
3.6      Meetings of Directors..........................................6
3.7      First Meeting..................................................6
3.8      Election of Officers...........................................6
3.9      Regular Meetings...............................................6
3.10     Special Meetings...............................................6
3.11     Notice.........................................................6
3.12     Quorum; Majority Vote..........................................7
3.13     Procedure......................................................7
3.14     Presumption of Assent..........................................7
3.15     Compensation...................................................7

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                            ARTICLE FOUR: COMMITTEES

4.1      Designation....................................................8
4.2      Number; Qualification; Term....................................8
4.3      Authority......................................................8
4.4      Committee Changes..............................................8
4.5      Alternate Members of Committees................................8
4.6      Regular Meetings...............................................8
4.7      Special Meetings...............................................8
4.8      Quorum; Majority Vote..........................................8
4.9      Minutes........................................................9
4.10     Responsibility.................................................9

                              ARTICLE FIVE: NOTICE

5.1      Method.........................................................9
5.2      Waiver.........................................................9

                              ARTICLE SIX: OFFICERS

6.1      Number; Titles; Term of Office.................................9
6.2      Removal.......................................................10
6.3      Vacancies.....................................................10
6.4      Authority.....................................................10
6.5      Compensation..................................................10
6.6      Chairman of the Board.........................................10
6.7      President.....................................................10
6.8      Vice Presidents...............................................11
6.9      Treasurer.....................................................11
6.10     Assistant Treasurers..........................................11
6.11     Secretary.....................................................11
6.12     Assistant Secretaries.........................................12
6.13     Other Officers................................................12

                  ARTICLE SEVEN: CERTIFICATES AND STOCKHOLDERS

7.1      Certificates for Shares.......................................12
7.2      Replacement of Lost or Destroyed Certificates.................12
7.3      Transfer of Shares............................................12
7.4      Registered Stockholders.......................................13

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7.5      Regulations...................................................13
7.6      Legends.......................................................13

                     ARTICLE EIGHT: MISCELLANEOUS PROVISIONS

8.1      Dividends.....................................................13
8.2      Reserves......................................................13
8.3      Books and Records.............................................13
8.4      Fiscal Year...................................................13
8.5      Seal..........................................................13
8.6      Resignations..................................................14
8.7      Securities of Other Corporations..............................14
8.8      Telephone Meetings............................................14
8.9      Action Without a Meeting......................................14
8.10     Invalid Provisions............................................14
8.11     Mortgages, etc................................................14
8.12     Headings......................................................14
8.13     References....................................................15
8.14     Amendments....................................................15


                                      iii







                           AMENDED AND RESTATED BYLAWS

                                       OF

                        PIONEER NATURAL RESOURCES COMPANY

                             A Delaware Corporation


                                    PREAMBLE

     These bylaws are subject to, and governed by, the General  Corporation  Law
of the  State of  Delaware  (the  "Delaware  General  Corporation  Law") and the
certificate of incorporation of Pioneer Natural  Resources  Company,  a Delaware
corporation  (the  "Company").  In the event of a direct  conflict  between  the
provisions of these bylaws and the mandatory  provisions of the Delaware General
Corporation  Law or the provisions of the  certificate of  incorporation  of the
Company,  such  provisions  of  the  Delaware  General  Corporation  Law  or the
certificate  of  incorporation  of the  Company,  as the  case  may be,  will be
controlling.

                              ARTICLE ONE: OFFICES

     1.1 Registered Office and Agent. The registered office and registered agent
of the  Company  shall be as  designated  from  time to time by the  appropriate
filing by the  Company in the office of the  Secretary  of State of the State of
Delaware.

     1.2 Other Offices.  The Company may also have offices at such other places,
both within and without the State of  Delaware,  as the board of  directors  may
from time to time determine or as the business of the Company may require.

                     ARTICLE TWO: MEETINGS OF STOCKHOLDERS

     2.1 Annual Meeting.  An annual meeting of stockholders of the Company shall
be held each  calendar year on such date and at such time as shall be designated
from  time to time by the board of  directors  and  stated in the  notice of the
meeting or in a duly executed waiver of notice of such meeting. At such meeting,
the  stockholders  shall elect directors and transact such other business as may
properly be brought before the meeting.

     2.2 Special Meeting.  Except as otherwise required by law, special meetings
of the common stockholders of the Company, and any proposals to be considered at
such meetings, may be called and proposed exclusively by the board of directors,
pursuant to a  resolution  approved by a majority of the members of the board of
directors at the time in office, and no stockholder of the Company shall require
the board of directors to call a special  meeting of common  stockholders  or to
propose business at a special meeting of common stockholders.  A special meeting
shall be held on such  date  and at such  time as  shall  be  designated  by the
resolution  calling  the meeting and stated in the notice of the meeting or in a

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duly  executed  waiver of notice of such meeting.  Only such  business  shall be
transacted  at a special  meeting as may be stated or indicated in the notice of
such meeting or in a duly executed waiver of notice of such meeting.

     2.3 Place of Meetings. An annual meeting of stockholders may be held at any
place  within  or  without  the  State of  Delaware  designated  by the board of
directors.  A special meeting of stockholders may be held at any place within or
without the State of Delaware  designated in the notice of the meeting or a duly
executed  waiver of notice of such meeting.  Meetings of  stockholders  shall be
held at the principal  office of the Company  unless another place is designated
for meetings in the manner provided herein.

     2.4 Notice.  Written or printed notice stating the place,  day, and time of
each meeting of the stockholders and, in case of a special meeting,  the purpose
or purposes for which the meeting is called,  shall be  delivered in  accordance
with  Section 5.1 not less than ten nor more than 60 days before the date of the
meeting by or at the  direction of the Board of  Directors,  the Chairman of the
Board  if  such  office  has  been  filled  (otherwise,  the  President)  or the
Secretary,  to each  stockholder of record entitled to vote at such meeting.  If
such notice is to be sent by mail, it shall be directed to such  stockholder  at
his or her address as it appears on the records of the Company, unless he or she
shall  have filed  with the  Secretary  of the  Company a written  request  that
notices  to him be  mailed  to some  other  address,  in which  case it shall be
directed to him at such other  address.  Notice of any  meeting of  stockholders
shall not be  required  to be given to any  stockholder  who shall  attend  such
meeting in person or by proxy and shall not, at the  beginning of such  meeting,
object to the  transaction  of any business  because the meeting is not lawfully
called or convened,  or who shall, either before or after the meeting,  submit a
signed waiver of notice, in person or by proxy.

     2.5 Voting List. At least ten days before each meeting of stockholders, the
Secretary or other officer of the Company who has charge of the Company's  stock
ledger, either directly or through another officer appointed by him or through a
transfer  agent  appointed by the board of  directors,  shall prepare a complete
list of stockholders  entitled to vote thereat,  arranged in alphabetical  order
and showing the address of each  stockholder and number of shares  registered in
the name of each  stockholder.  For a period of ten days prior to such  meeting,
such list shall be kept on file at a place  within the city where the meeting is
to be held,  which place shall be  specified  in the notice of meeting or a duly
executed waiver of notice of such meeting or, if not so specified,  at the place
where  the  meeting  is to be held  and  shall  be open  to  examination  by any
stockholder  during ordinary business hours. Such list shall be produced at such
meeting  and kept at the  meeting at all times  during  such  meeting and may be
inspected by any stockholder who is present.

     2.6 Quorum. The holders of a majority of the outstanding shares entitled to
vote on a matter,  present in person or by proxy,  shall  constitute a quorum at
any  meeting  of  stockholders,   except  as  otherwise  provided  by  law,  the
certificate of incorporation of the Company,  or these bylaws. If a quorum shall
not be  present,  in person or by proxy,  at any  meeting of  stockholders,  the
stockholders  entitled to vote thereat who are  present,  in person or by proxy,

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or, if no  stockholder  entitled to vote is present,  any officer of the Company
may  adjourn  the  meeting  from  time  to  time,   without  notice  other  than
announcement  at  the  meeting  (unless  the  board  of  directors,  after  such
adjournment,  fixes a new record date for the adjourned meeting), until a quorum
shall be present,  in person or by proxy.  At any  adjourned  meeting at which a
quorum shall be present,  in person or by proxy,  any business may be transacted
which  may have  been  transacted  at the  original  meeting  had a quorum  been
present; provided that, if the adjournment is for more than 30 days, or if after
the adjournment a new record date is fixed for the adjourned  meeting,  a notice
of the adjourned  meeting shall be given to each  stockholder of record entitled
to vote at the adjourned meeting.

     2.7 Required  Vote;  Withdrawal of Quorum.  When a quorum is present at any
meeting,  the vote of the  holders  of at least a  majority  of the  outstanding
shares entitled to vote who are present, in person or by proxy, shall decide any
question  brought before such meeting,  unless the question is one on which,  by
express  provision of statute,  the certificate of incorporation of the Company,
or these  bylaws,  a  different  vote is  required,  in which case such  express
provision  shall  govern  and  control  the  decision  of  such  question.   The
stockholders  present at a duly  constituted  meeting  may  continue to transact
business   until   adjournment,   notwithstanding   the   withdrawal  of  enough
stockholders to leave less than a quorum.

     2.8  Method  of  Voting;  Proxies.  Except  as  otherwise  provided  in the
certificate of incorporation  of the Company or by law, each outstanding  share,
regardless of class, shall be entitled to one vote on each matter submitted to a
vote at a meeting of stockholders. Elections of directors need not be by written
ballot. At any meeting of stockholders,  every  stockholder  having the right to
vote may vote in person or may  authorize  another  person or persons to act for
such  stockholder by proxy in any manner permitted by law. Each such proxy shall
be filed with the Secretary of the Company before or at the time of the meeting.
No proxy  shall be valid  after  three  years  from its date,  unless  otherwise
provided  in the proxy.  If no date is stated in a proxy,  such  proxy  shall be
presumed  to have  been  dated on the date of the  meeting  at which it is to be
voted.  Each proxy shall be revocable  unless  expressly  provided therein to be
irrevocable  and  coupled  with an  interest  sufficient  in law to  support  an
irrevocable power or unless otherwise made irrevocable by law.

     2.9 Record Date.  For the purpose of determining  stockholders  entitled to
notice of or to vote at any meeting of stockholders, or any adjournment thereof,
or  entitled  to  receive  payment  of any  dividend  or other  distribution  or
allotment  of any rights,  or entitled to exercise  any rights in respect of any
change,  conversion, or exchange of stock or for the purpose of any other lawful
action,  the board of directors  may fix a record date,  which record date shall
not precede the date upon which the resolution fixing the record date is adopted
by the board of directors, for any such determination of stockholders, such date
in any case to be not more than 60 days and not less than ten days prior to such
meeting  nor more than 60 days prior to any other  action.  If no record date is
fixed:

     (a) The record date for determining  stockholders  entitled to notice of or
to vote at a meeting of  stockholders  shall be at the close of  business on the

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day next preceding the day on which notice is given or, if notice is waived,  at
the close of business on the day next  preceding the day on which the meeting is
held.

     (b) The record  date for  determining  stockholders  for any other  purpose
shall be at the close of  business  on the day on which  the board of  directors
adopts the resolution relating thereto.

     (c) A  determination  of stockholders of record entitled to notice of or to
vote at a meeting of stockholders shall apply to any adjournment of the meeting;
provided, however, that the board of directors may fix a new record date for the
adjourned meeting.

     2.10 Conduct of Meeting. The Chairman of the Board, if such office has been
filled,  shall preside at all meetings of  stockholders.  If such office has not
been filled,  or if the  Chairman of the Board is absent or otherwise  unable to
act, the President  shall preside.  The Secretary shall keep the records of each
meeting of stockholders. In the absence or inability to act of any such officer,
such  officer's  duties shall be performed by the officer given the authority to
act for such absent or  non-acting  officer under these bylaws or by some person
appointed by the meeting.

     2.11  Inspectors.  The board of directors may, in advance of any meeting of
stockholders,  appoint  one or more  inspectors  to act at such  meeting  or any
adjournment  thereof. If any of the inspectors so appointed shall fail to appear
or act, the chairman of the meeting shall, or if inspectors  shall not have been
appointed, the chairman of the meeting may, appoint one or more inspectors. Each
inspector,  before entering upon the discharge of his or her duties,  shall take
and sign an oath  faithfully  to execute the duties of inspector at such meeting
with strict  impartiality  and according to the best of his or her ability.  The
inspectors  shall determine the number of shares of capital stock of the Company
outstanding  and the voting power of each,  the number of shares  represented at
the meeting,  the existence of a quorum,  and the validity and effect of proxies
and shall  receive  votes or ballots,  hear and  determine  all  challenges  and
questions  arising in connection with the right to vote,  count and tabulate all
votes or  ballots,  determine  the  results,  and do such acts as are  proper to
conduct the election or vote with  fairness to all  stockholders.  On request of
the chairman of the meeting,  the  inspectors  shall make a report in writing of
any  challenge,  request,  or  matter  determined  by them and  shall  execute a
certificate  of any fact found by them.  No director or candidate for the office
of director  shall act as an inspector of an election of  directors.  Inspectors
need not be stockholders.

                            ARTICLE THREE: DIRECTORS

     3.1  Management.  The business and property of the Company shall be managed
by the board of  directors.  Subject to the  restrictions  imposed  by law,  the
certificate  of  incorporation  of the Company,  or these  bylaws,  the board of
directors may exercise all the powers of the Company.

     3.2 Number; Election;  Classification;  Term; Qualification.  The number of
directors that shall  constitute the entire board of directors shall be not less
than three and not more than  twenty-one.  The first  board of  directors  shall

                                       4





consist of the number of directors named in the certificate of  incorporation of
the Company or, if no  directors  are so named,  shall  consist of the number of
directors  elected by the  incorporator(s)  at an  organizational  meeting or by
unanimous written consent in lieu thereof.  Thereafter,  within the limits above
specified,  the number of  directors  that shall  constitute  the whole board of
directors shall from time to time be fixed exclusively by the board of directors
by a resolution adopted by a majority of the whole board of directors serving at
the time of that  vote.  Except as  otherwise  required  by law or  required  or
permitted by the  certificate of  incorporation  of the Company or these bylaws,
the directors  shall be elected at an annual meeting of  stockholders at which a
quorum is present. Directors shall be elected by a plurality of the votes of the
shares  present in person or  represented  by proxy and  entitled to vote on the
election of directors.  Effective at the time  specified in the  certificate  of
incorporation  of the Company,  the board of  directors of the Company  shall be
divided  into  three  classes  designated  Class I,  Class II,  and  Class  III,
respectively, all as nearly equal in number as possible, with each director then
in office receiving the classification  that at least a majority of the board of
directors  designates.  The initial  term of office of the  directors of Class I
shall expire at the annual  meeting of  stockholders  of the Company in 1998, of
Class II shall expire at the annual  meeting of  stockholders  of the Company in
1999, and of Class III shall expire at the annual meeting of stockholders of the
Company in 2000, and in all cases as to each director until his or her successor
is elected and  qualified  or until his or her  earlier  death,  resignation  or
removal.  At each  annual  meeting  of  stockholders  beginning  with the annual
meeting of  stockholders  in 1998,  each director  elected to succeed a director
whose term is then expiring  shall hold his or her office until the third annual
meeting of stockholders after his or her election and until his or her successor
is elected and  qualified  or until his or her  earlier  death,  resignation  or
removal.  Except as may be required pursuant to any stock ownership requirements
adopted by the board or any of its  committees,  none of the directors need be a
stockholder  of the  Company.  None of the  directors  need be a resident of the
State of Delaware. Each director must have attained the age of majority.

     3.3 Change in Number. If the number of directors that constitutes the whole
board  of  directors  is  changed  in  accordance   with  the   certificate   of
incorporation  and these  bylaws,  the  majority of the whole board of directors
that  adopts the change  shall also fix and  determine  the number of  directors
comprising each class;  provided,  however, that any increase or decrease in the
number of  directors  shall be  apportioned  among the  classes  as  equally  as
possible.  No decrease in the number of directors  constituting the entire board
of  directors  shall have the  effect of  shortening  the term of any  incumbent
director.

     3.4 Removal.  No director of any class of directors of the Company shall be
removed before the expiration  date of that director's term of office except for
cause and by an affirmative  vote of the holders of not less than  two-thirds of
the outstanding  shares of the class or classes or series of stock then entitled
to be voted at an election of directors of that class or series, voting together
as a single class,  cast at the annual meeting of stockholders or at any special
meeting of stockholders called by a majority of the whole board of directors for
this purpose.


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     3.5  Vacancies.  Vacancies in the board of directors  resulting from death,
resignation, retirement,  disqualification,  removal from office, or other cause
and  newly-created  directorships  resulting from any increase in the authorized
number of  directors  may be filled by no less than a majority of the  remaining
directors  then in office,  though  less than a quorum,  who are  designated  to
represent the same class or classes of  stockholders  that the vacant  position,
when filled,  is to represent or by the sole remaining  director (but not by the
common  stockholders  except as  required by law),  and each  director so chosen
shall receive the  classification of the vacant  directorship to which he or she
has been appointed or, if it is a newly-created directorship,  shall receive the
classification that at least a majority of the board of directors designates and
shall hold office until the first meeting of stockholders  held after his or her
election for the purpose of electing directors of that  classification and until
his or her  successor  is  elected  and  qualified  or until  his or her  death,
resignation,  or removal  from office.  If there are no directors in office,  an
election of directors may be held in the manner  provided by statute.  Except as
otherwise provided in these bylaws, when one or more directors shall resign from
the board of directors,  effective at a future date, a majority of the directors
then in office,  including  those who have so resigned,  who are  designated  to
represent the same class or classes or series of stockholders  that the position
being vacated represents shall have the power to fill such vacancy or vacancies,
the vote  thereon to take effect when such  resignation  or  resignations  shall
become  effective,  and each director so chosen shall hold office as provided in
these bylaws with respect to the filling of other vacancies.

     3.6 Meetings of Directors.  The  directors may hold their  meetings and may
have an office and keep the books of the Company,  except as otherwise  provided
by statute,  in such place or places  within or without the State of Delaware as
the board of directors may from time to time  determine or as shall be specified
in the notice of such meeting or duly executed waiver of notice of such meeting.

     3.7 First Meeting. Each newly elected board of directors may hold its first
meeting for the purpose of organization  and the  transaction of business,  if a
quorum is present, immediately after and at the same place as the annual meeting
of stockholders, and no notice of such meeting shall be necessary.

     3.8  Election of Officers.  At the first  meeting of the board of directors
after each annual  meeting of  stockholders  at which a quorum shall be present,
the board of  directors  shall elect the  officers of the  Company.  3.9 Regular
Meetings. Regular meetings of the board of directors shall be held at such times
and places as shall be  designated  from time to time by resolution of the board
of directors. Notice of such regular meetings shall not be required.

     3.10 Special Meetings.  Special meetings of the board of directors shall be
held  whenever  called by the  Chairman  of the  Board,  the  President,  or any
director.

     3.11 Notice.  The  Secretary  shall give notice of each special  meeting to
each  director at least 24 hours before the meeting.  Notice of any such meeting
need not be given to any director who shall, either before or after the meeting,

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submit a signed  waiver  of  notice or who shall  attend  such  meeting  without
protesting, prior to or at its commencement,  the lack of notice to him. Neither
the  business  to be  transacted  at, nor the purpose of, any regular or special
meeting of the board of  directors  need be specified in the notice or waiver of
notice of such meeting.

     3.12 Quorum;  Majority  Vote. At all meetings of the board of directors,  a
majority of the  directors  fixed in the manner  provided in these  bylaws shall
constitute a quorum for the  transaction  of business.  If at any meeting of the
board of  directors  there be less than a quorum  present,  a majority  of those
present or any director solely present may adjourn the meeting from time to time
without further  notice.  Unless the act of a greater number is required by law,
the certificate of incorporation of the Company,  or these bylaws,  the act of a
majority  of the  directors  present  at a  meeting  at  which  a  quorum  is in
attendance  shall be the act of the  board of  directors.  At any time  that the
certificate of incorporation  of the Company provides that directors  elected by
the  holders of a class or series of stock shall have more or less than one vote
per  director on any matter,  every  reference  in these bylaws to a majority or
other  proportion of directors shall refer to a majority or other  proportion of
the votes of such directors.

     3.13  Procedure.  At meetings of the board of directors,  business shall be
transacted  in such  order as from  time to time  the  board  of  directors  may
determine.  The  Chairman of the Board,  if such office has been  filled,  shall
preside at all meetings of the board of directors. If such position has not been
filled,  or if the Chairman of the Board is absent or  otherwise  unable to act,
the President  shall preside.  In the absence or inability to act of either such
officer,  a chairman  shall be chosen by the board of  directors  from among the
directors  present.  The  Secretary of the Company shall act as the secretary of
each  meeting of the board of directors  unless the board of directors  appoints
another person to act as secretary of the meeting.  The board of directors shall
keep regular minutes of its proceedings which shall be placed in the minute book
of the Company.

     3.14 Presumption of Assent. A director of the Company who is present at the
meeting of the board of  directors at which  action on any  corporate  matter is
taken shall be presumed to have assented to the action unless his or her dissent
shall be  entered in the  minutes of the  meeting or unless he or she shall file
his or her written dissent to such action with the person acting as secretary of
the  meeting  before the  adjournment  thereof or shall  forward  any dissent by
certified or registered mail to the Secretary of the Company  immediately  after
the  adjournment  of the  meeting.  Such right to  dissent  shall not apply to a
director who voted in favor of such action.

     3.15  Compensation.  The board of directors shall have the authority to fix
the  compensation,  including  fees  and  reimbursement  of  expenses,  paid  to
directors  for  attendance  at  regular  or  special  meetings  of the  board of
directors or any committee  thereof;  provided,  that nothing  contained  herein
shall be  construed  to preclude  any  director  from serving the Company in any
other capacity or receiving compensation therefor.


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                            ARTICLE FOUR: COMMITTEES

     4.1  Designation.  The board of directors  may, by resolution  adopted by a
majority of the entire board of directors, designate one or more committees.

     4.2 Number;  Qualification;  Term.  Each committee  shall consist of one or
more directors appointed by resolution adopted by a majority of the entire board
of directors. The number of committee members may be increased or decreased from
time to time  by  resolution  adopted  by a  majority  of the  entire  board  of
directors.  Each committee  member shall serve as such until the earliest of (i)
the expiration of his or her term as director,  (ii) his or her resignation as a
committee  member or as a  director,  or (iii) his or her removal as a committee
member or as a director.

     4.3 Authority.  Each  committee,  to the extent  expressly  provided in the
resolution  establishing such committee,  shall have and may exercise all of the
authority  of the board of  directors  in the  management  of the  business  and
property of the Company  except to the extent  expressly  restricted by law, the
certificate of incorporation of the Company, or these bylaws.

     4.4 Committee  Changes.  The board of directors shall have the power at any
time to fill  vacancies  in, to change the  membership  of, and to discharge any
committee.

     4.5 Alternate  Members of Committees.  The board of directors may designate
one or more directors as alternate members of any committee.  Any such alternate
member may  replace  any  absent or  disqualified  member at any  meeting of the
committee.  If no  alternate  committee  members  have  been so  appointed  to a
committee or each such alternate committee member is absent or disqualified, the
member or members of such committee  present at any meeting and not disqualified
from  voting,  whether  or not  he or  she or  they  constitute  a  quorum,  may
unanimously  appoint  another  member  of the board of  directors  to act at the
meeting in the place of any such absent or disqualified member.

     4.6 Regular Meetings. Regular meetings of any committee may be held without
notice  at such  time and  place as may be  designated  from time to time by the
committee and communicated to all members thereof.

     4.7  Special  Meetings.  Special  meetings  of any  committee  may be  held
whenever  called by any  committee  member.  The  committee  member  calling any
special meeting shall cause notice of such special  meeting,  including  therein
the time and place of such special meeting, to be given to each committee member
at least two days  before  such  special  meeting.  Neither  the  business to be
transacted at, nor the purpose of, any special  meeting of any committee need be
specified in the notice or waiver of notice of any special meeting.

     4.8 Quorum;  Majority Vote. At meetings of any committee, a majority of the
number of members designated by the board of directors shall constitute a quorum
for the transaction of business.  If a quorum is not present at a meeting of any
committee,  a majority of the members  present may adjourn the meeting from time
to time,  without  notice other than an  announcement  at the  meeting,  until a

                                       8





quorum is present.  The act of a majority of the members  present at any meeting
at which a quorum is in attendance  shall be the act of a committee,  unless the
act of a greater number is required by law, the certificate of  incorporation of
the Company, or these bylaws.

     4.9 Minutes.  Each committee  shall cause minutes of its  proceedings to be
prepared and shall report the same to the board of directors upon the request of
the board of directors.  The minutes of the  proceedings of each committee shall
be delivered to the  Secretary of the Company for  placement in the minute books
of the Company.

     4.10 Responsibility. The designation of any committee and the delegation of
authority  to it shall not  operate to  relieve  the board of  directors  or any
director of any responsibility imposed upon it or such director by law.

                              ARTICLE FIVE: NOTICE

     5.1 Method.  Whenever by statute,  the certificate of  incorporation of the
Company,  or these  bylaws,  notice  is  required  to be given to any  committee
member,  director, or stockholder and no provision is made as to how such notice
shall be given, personal notice shall not be required and any such notice may be
given (a) in writing,  by mail,  postage  prepaid,  addressed to such  committee
member,  director,  or  stockholder  at his or her  address as it appears on the
books  or (in the case of a  stockholder)  the  stock  transfer  records  of the
Company,  or (b) by any other method  permitted  by law. Any notice  required or
permitted to be given by mail shall be deemed to be  delivered  and given at the
time when the same is  deposited  in the United  States mail as  aforesaid.  Any
notice  required or permitted to be given by overnight  courier service shall be
deemed to be delivered and given at the time  delivered to such service with all
charges prepaid and addressed as aforesaid.  Any notice required or permitted to
be given by telegram,  telex,  or telefax  shall be deemed to be  delivered  and
given  at the time  transmitted  with  all  charges  prepaid  and  addressed  as
aforesaid.

     5.2 Waiver. Whenever any notice is required to be given to any stockholder,
director,  or committee  member of the Company by statute,  the  certificate  of
incorporation  of the  Company,  or these  bylaws,  a waiver  thereof in writing
signed by the person or persons entitled to such notice, whether before or after
the time  stated  therein,  shall be  equivalent  to the giving of such  notice.
Attendance of a stockholder,  director,  or committee  member at a meeting shall
constitute a waiver of notice of such meeting,  except where such person attends
for the express  purpose of objecting to the  transaction of any business on the
ground that the meeting is not lawfully called or convened.

                             ARTICLE SIX: OFFICERS

     6.1 Number;  Titles; Term of Office. The officers of the Company shall be a
President,  a Secretary,  and such other  officers as the board of directors may
from time to time elect or appoint,  including  a Chairman of the Board,  one or
more Vice Presidents (with each Vice President to have such  descriptive  title,
if any,  as the board of  directors  shall  determine),  and a  Treasurer.  Each

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officer  shall  hold  office  until his or her  successor  shall  have been duly
elected  and shall have  qualified,  until his or her death,  or until he or she
shall resign or shall have been removed in the manner hereinafter provided.  Any
two or more  offices may be held by the same  person.  Except as may be required
pursuant to any stock ownership  requirements adopted by the board or any of its
committees,  none of the officers need be a stockholder of the Company.  None of
the  officers  need be a director  of the  Company or a resident of the State of
Delaware.

     6.2  Removal.  Any officer or agent  elected or  appointed  by the board of
directors may be removed by the board of directors  whenever in its judgment the
best interest of the Company will be served  thereby,  but such removal shall be
without  prejudice  to the  contract  rights,  if any, of the person so removed.
Election  or  appointment  of an  officer  or agent  shall not of itself  create
contract rights.

     6.3  Vacancies.  Any  vacancy  occurring  in any office of the  Company (by
death,  resignation,  removal,  or  otherwise)  may be  filled  by the  board of
directors.

     6.4  Authority.  Officers shall have such authority and perform such duties
in the  management  of the Company as are  provided in these bylaws or as may be
determined by resolution of the board of directors not  inconsistent  with these
bylaws.

     6.5 Compensation. The compensation, if any, of officers and agents shall be
fixed from time to time by the board of directors;  provided,  however, that the
board of directors may delegate the power to determine the  compensation  of any
officer and agent  (other than the officer to whom such power is  delegated)  to
the Chairman of the Board or the  President or to any  committee of the board of
directors.

     6.6  Chairman of the Board.  The  Chairman of the Board,  if elected by the
board of  directors,  shall have such powers and duties as may be  prescribed by
the board of directors,  which may include being the chief executive  officer of
the Company.  If designated as the chief executive officer,  the Chairman of the
Board  shall have  general  executive  charge,  management,  and  control of the
properties and operations of the Company in the ordinary course of its business,
with all such powers with respect to such  properties  and  operations as may be
reasonably incident to such responsibilities.  Such officer shall preside at all
meetings of the  stockholders  and of the board of  directors.  Such officer may
agree upon and execute all division and transfer orders, bonds,  contracts,  and
other  obligations  in the  name  of the  Company,  and he or she may  sign  all
certificates for shares of stock of the Company.

     6.7  President.  If a Chairman of the Board has not been  elected or if the
Chairman of the Board has been elected but has not been  designated by the board
of directors to be the chief  executive  officer of the Company,  the  President
shall be the chief executive officer of the Company and, subject to the board of
directors,  he or she shall  have  general  executive  charge,  management,  and
control of the properties  and operations of the Company in the ordinary  course
of its  business,  with all such  powers  with  respect to such  properties  and
operations  as may be  reasonably  incident  to  such  responsibilities.  If the
Chairman  of the Board has been  elected  and has been  designated  as the chief

                                       10





executive officer of the Company, the President shall be the chief operating and
administrative  officer of the Company and,  subject to the board of  directors,
shall have charge of the actual  day-to-day  operations  and  management  of the
Company and its property  with all such powers with  respect to such  properties
and operations as may be reasonably  incident to such  responsibilities.  If the
board of directors  has not elected a Chairman of the Board or in the absence or
inability to act of the Chairman of the Board,  the President shall exercise all
of the powers and discharge  all of the duties of the Chairman of the Board.  As
between the Company and third parties,  any action taken by the President in the
performance  of the  duties of the  Chairman  of the Board  shall be  conclusive
evidence  that there is no  Chairman  of the Board or that the  Chairman  of the
Board is absent or unable to act.

     6.8 Vice Presidents.  Each Vice President shall have such powers and duties
as may be assigned to him by the board of directors,  the Chairman of the Board,
or the President, and (in order of their seniority as determined by the board of
directors or, in the absence of such determination,  as determined by the length
of time they have held the office of Vice  President)  shall exercise the powers
of the President  during that officer's  absence or inability to act. As between
the Company  and third  parties,  any action  taken by a Vice  President  in the
performance of the duties of the President  shall be conclusive  evidence of the
absence or inability to act of the President at the time such action was taken.

     6.9 Treasurer.  The Treasurer shall have custody of the Company's funds and
securities,  shall keep full and accurate account of receipts and disbursements,
shall  deposit all monies and valuable  effects in the name and to the credit of
the Company in such depository or depositories as may be designated by the board
of  directors,  and shall  perform such other duties as may be prescribed by the
board of directors, the Chairman of the Board, or the President.

     6.10 Assistant Treasurers.  Each Assistant Treasurer shall have such powers
and duties as may be assigned to him by the board of directors,  the Chairman of
the Board,  or the  President.  The Assistant  Treasurers (in the order of their
seniority as  determined  by the board of directors or, in the absence of such a
determination,  as determined by the length of time they have held the office of
Assistant  Treasurer)  shall  exercise the powers of the  Treasurer  during that
officer's absence or inability to act.

     6.11 Secretary. Except as otherwise provided in these bylaws, the Secretary
shall  keep the  minutes  of all  meetings  of the board of  directors  in books
provided for that purpose,  and he or she shall attend to the giving and service
of all  notices.  He or she may  sign  with  the  Chairman  of the  Board or the
President,  in the name of the Company,  all  contracts of the Company and affix
the seal of the  Company  thereto.  He or she may sign with the  Chairman of the
Board or the President all certificates for shares of stock of the Company,  and
he or she shall have charge of the certificate books,  transfer books, and stock
papers  as the  board  of  directors  may  direct,  all of  which  shall  at all
reasonable  times be open to inspection by any director upon  application at the
office of the Company during  business hours. He or she shall in general perform
all duties  incident to the office of the  Secretary,  subject to the control of
the board of directors, the Chairman of the Board, and the President.

                                       11





     6.12 Assistant Secretaries. Each Assistant Secretary shall have such powers
and duties as may be assigned to him by the board of directors,  the Chairman of
the Board,  or the President.  The Assistant  Secretaries (in the order of their
seniority as  determined  by the board of directors or, in the absence of such a
determination,  as determined by the length of time they have held the office of
Assistant  Secretary)  shall  exercise the powers of the  Secretary  during that
officer's absence or inability to act.

     6.13 Other  Officers.  Each other officer elected by the board of directors
and  designated  to be an officer of the  Company  shall have the title that the
board of directors may prescribe and the duties that the board of directors, the
Chairman of the Board, or the President may prescribe.

                  ARTICLE SEVEN: CERTIFICATES AND STOCKHOLDERS

     7.1 Certificates for Shares. Shares of the capital stock of the Company may
be certificated or uncertificated as provided by law. Certificates for shares of
stock of the Company  shall be in such form as shall be approved by the board of
directors.  The certificates shall be signed by the Chairman of the Board or the
President  or a Vice  President  and  also  by  the  Secretary  or an  Assistant
Secretary or by the Treasurer or an Assistant Treasurer.  Any and all signatures
on the  certificate  may be a  facsimile  and may be sealed with the seal of the
Company or a facsimile thereof. If any officer, transfer agent, or registrar who
has signed, or whose facsimile signature has been placed upon, a certificate has
ceased to be such officer,  transfer agent, or registrar before such certificate
is issued, such certificate may be issued by the Company with the same effect as
if he or she were such  officer,  transfer  agent,  or  registrar at the date of
issue. The certificates shall be consecutively  numbered and shall be entered in
the books of the Company as they are issued and shall  exhibit the holder's name
and the number of shares.

     7.2 Replacement of Lost or Destroyed  Certificates.  The board of directors
may  direct  a new  certificate  or  certificates  to be  issued  in  place of a
certificate  or  certificates  theretofore  issued by the Company and alleged to
have been lost or destroyed, upon the making of an affidavit of that fact by the
person claiming the certificate or certificates  representing  shares to be lost
or destroyed.  When  authorizing such issue of a new certificate or certificates
the board of directors may, in its  discretion  and as a condition  precedent to
the issuance thereof, require the owner of such lost or destroyed certificate or
certificates, or his or her legal representative,  to advertise the same in such
manner as it shall  require  and/or to give the  Company a bond with a surety or
sureties  satisfactory  to the Company in such sum as it may direct as indemnity
against any claim, or expense  resulting from a claim,  that may be made against
the Company with respect to the certificate or certificates alleged to have been
lost or destroyed.

     7.3  Transfer  of  Shares.   Shares  of  stock  of  the  Company  shall  be
transferable  only on the books of the Company by the holders  thereof in person
or by their duly authorized attorneys or legal  representatives.  Upon surrender
to  the  Company  or  the  transfer  agent  of  the  Company  of  a  certificate
representing   shares  duly  endorsed  or  accompanied  by  proper  evidence  of
succession,  assignment,  or authority to transfer,  the Company or its transfer

                                       12





agent shall issue a new certificate to the person entitled  thereto,  cancel the
old certificate, and record the transaction upon its books.

     7.4  Registered  Stockholders.  The Company  shall be entitled to treat the
holder of record of any share or shares of stock as the  holder in fact  thereof
and,  accordingly,  shall not be bound to recognize any equitable or other claim
to or interest in such share or shares on the part of any other person,  whether
or not it shall  have  express  or other  notice  thereof,  except as  otherwise
provided by law.

     7.5 Regulations.  The board of directors shall have the power and authority
to make all such rules and regulations as they may deem expedient concerning the
issue,  transfer, and registration or the replacement of certificates for shares
of stock of the Company.

     7.6 Legends.  The board of directors  shall have the power and authority to
provide that certificates  representing shares of stock bear such legends as the
board of directors deems  appropriate to assure that the Company does not become
liable for violations of federal or state  securities  laws or other  applicable
law.

                    ARTICLE EIGHT: MISCELLANEOUS PROVISIONS

     8.1  Dividends.  Subject  to  provisions  of law  and  the  certificate  of
incorporation  of the  Company,  dividends  may be  declared  by  the  board  of
directors  at any  regular  or  special  meeting  and may be paid  in  cash,  in
property,  or in shares of stock of the Company.  Such  declaration  and payment
shall be at the discretion of the board of directors.

     8.2  Reserves.  There may be created by the board of directors out of funds
of the  Company  legally  available  therefor  such  reserve or  reserves as the
directors from time to time, in their discretion, consider proper to provide for
contingencies,  to equalize dividends,  or to repair or maintain any property of
the Company,  or for such other purpose as the board of directors shall consider
beneficial to the Company,  and the board of directors may modify or abolish any
such reserve in the manner in which it was created.

     8.3 Books and Records.  The Company  shall keep correct and complete  books
and records of account,  shall keep minutes of the  proceedings  of its board of
directors  and  shall  keep at its  registered  office  or  principal  place  of
business,  or at the office of its transfer agent or registrar,  a record of its
stockholders,  giving the names and addresses of all stockholders and the number
and class of the shares held by each.

     8.4 Fiscal Year. The fiscal year of the Company shall be fixed by the board
of  directors;  provided,  that if such fiscal year is not fixed by the board of
directors and the selection of the fiscal year is not expressly  deferred by the
board of directors, the fiscal year shall be the calendar year.

     8.5 Seal. The seal of the Company shall be such as from time to time may be
approved by the board of directors.

                                       13





     8.6 Resignations.  Any director, committee member, or officer may resign by
giving written notice to the board of directors,  the Chairman of the Board, the
President,  or the  Secretary.  Such  resignation  shall take effect at the time
specified  therein or, if no time is  specified  therein,  immediately  upon its
receipt.  Unless otherwise specified therein, the acceptance of such resignation
shall not be necessary to make it effective.

     8.7  Securities  of Other  Corporations.  The  Chairman  of the Board,  the
President,  or any Vice  President  of the  Company  shall  have the  power  and
authority to transfer,  endorse for transfer,  vote,  consent, or take any other
action with  respect to any  securities  of another  issuer which may be held or
owned by the Company and to make,  execute,  and deliver any waiver,  proxy,  or
consent with respect to any such securities.

     8.8 Telephone Meetings. Members of the board of directors, and members of a
committee of the board of directors,  may  participate  in and hold a meeting of
such board of  directors  or  committee  by means of a  conference  telephone or
similar communications  equipment by means of which persons participating in the
meeting can hear each other,  and  participation  in a meeting  pursuant to this
section  shall  constitute  presence in person at such  meeting,  except where a
person  participates  in the meeting for the express purpose of objecting to the
transaction  of any  business  on the ground  that the  meeting is not  lawfully
called or convened.

     8.9  Action  Without  a  Meeting.   Unless  otherwise   restricted  by  the
certificate  of  incorporation  of the  Company or by these  bylaws,  any action
required or permitted to be taken at a meeting of the board of directors,  or of
any  committee of the board of  directors,  may be taken  without a meeting if a
consent or  consents  in writing,  setting  forth the action so taken,  shall be
signed by all the  directors or all the committee  members,  as the case may be,
entitled to vote with respect to the subject  matter  thereof,  and such consent
shall have the same force and effect as a vote of such  directors  or  committee
members,  as the case may be,  and may be stated as such in any  certificate  or
document  filed with the  Secretary  of State of the State of Delaware or in any
certificate  delivered to any person.  Such  consent or consents  shall be filed
with the minutes of proceedings of the board or committee, as the case may be.

     8.10 Invalid Provisions.  If any part of these bylaws shall be held invalid
or inoperative for any reason, the remaining parts, so far as it is possible and
reasonable, shall remain valid and operative.

     8.11 Mortgages,  etc. With respect to any deed, deed of trust, mortgage, or
other instrument  executed by the Company through its duly authorized officer or
officers,  the  attestation  to such  execution by the  Secretary of the Company
shall not be necessary to  constitute  such deed,  deed of trust,  mortgage,  or
other instrument a valid and binding  obligation  against the Company unless the
resolutions,  if any,  of the  board of  directors  authorizing  such  execution
expressly state that such attestation is necessary.

     8.12  Headings.  The headings  used in these bylaws have been  inserted for
administrative  convenience only and do not constitute matter to be construed in
interpretation.

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     8.13  References.  Whenever  herein the singular  number is used,  the same
shall include the plural when appropriate, and words referring to persons of one
sex shall include references to persons of the other sex when appropriate.

     8.14 Amendments.  These bylaws may be altered,  amended, or repealed or new
bylaws may be adopted by the board of  directors  at any regular  meeting of the
board of directors or at any special meeting of the board of directors if notice
of such alteration, amendment, repeal, or adoption of new bylaws be contained in
the notice of such special meeting.  These bylaws may also be altered,  amended,
or  repealed  or new bylaws may be adopted  upon the vote of the  holders of not
less than  two-thirds of the  outstanding  shares of stock then entitled to vote
upon the election of directors at any regular meeting of the  stockholders or at
any special meeting of the stockholders if notice of such alteration, amendment,
repeal,  or adoption of new bylaws be  contained  in the notice of such  special
meeting.

     The  undersigned,  the Secretary of the Company,  hereby certifies that the
foregoing  amended and restated  bylaws were  adopted by  unanimous  vote of the
directors of the Company as of November 15, 2006.


                        PIONEER NATURAL RESOURCES COMPANY


                                By:  /s/ Mark H. Kleinman
                                     ------------------------------------------
                                     Mark H. Kleinman
                                     Secretary






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