EXHIBIT 10.2

                        PIONEER NATURAL RESOURCES COMPANY
                               SEVERANCE AGREEMENT

     This Severance Agreement  ("Agreement") is entered into, as of December 12,
2005,  among  Pioneer  Natural  Resources   Company,   a  Delaware   corporation
("Parent"),  Pioneer Natural Resources USA, Inc., a Delaware corporation that is
a   wholly-owned   subsidiary  of  Parent   ("Employer")   and  William   Hannes
("Employee").  As used henceforth in this Agreement, the term "Company" shall be
deemed to include Parent and its direct or indirect majority-owned subsidiaries.


                                    Recitals

     Parent  and  Employer   acknowledge  that  Employee  possesses  skills  and
knowledge  instrumental  to the  successful  conduct of the Company's  business.
Parent and Employer are willing to enter into this  Agreement  with  Employee in
order to  better  ensure  themselves  of  access to the  continued  services  of
Employee.

     NOW,  THEREFORE,  for and in  consideration  of the  mutual  covenants  and
agreements set forth herein and for other good and valuable  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the parties to this
Agreement hereby agree as follows:

     1. Term.  The term of this Agreement  shall commence on  the date indicated
above (the "Effective Date") and end on September 30, 2007.  Thereafter,  on the
date on which the term of this  Agreement  (as it may be  extended  from time to
time under this  paragraph  1) would  otherwise  expire,  so long as Employee is
still an employee of the Company on such date,  such term will be  automatically
extended for 12 months,  unless  Parent shall have  provided  written  notice to
Employee at least 6 months before the date that the term would otherwise  expire
that it does not want the term to be extended.  Parent may deliver a conditional
notice of  non-renewal  that will be effective  only if Employee does not agree,
within the time period specified by Parent,  to any amendment or modification of
this  Agreement that Parent shall request be executed as a condition to allowing
the term  hereof  to be  extended.  Notwithstanding  the  foregoing,  so long as
Employee is in the employ of the Company on the date on which a Potential Change
in Control occurs, the term of this Agreement shall continue in effect following
such  Potential  Change  in  Control  until  the date on  which  the term of any
separate  agreement  between  Parent and Employer  and Employee  relating to the
provision of severance and other benefits after a Change in Control (the "Change
in Control Agreement") expires;  provided,  however, that upon the occurrence of
such a Change in Control,  this  Agreement  shall  terminate  and such Change in
Control  Agreement  shall  govern the rights of Employee to, or  obligations  of
Parent and Employer to provide, severance and other benefits to Employee.

     2. Certain Definitions.  As used  in this  Agreement,  the  following terms
shall have the meanings set forth below:

          (a) "Accrued  Obligations"  shall mean any  vested amounts or benefits
     owing to Employee under  any of the  Company's  employee benefit  plans and
     programs in  which Employee  has participated, including  any  compensation
     previously  deferred  by  Employee  (together  with  any  accrued  earnings
     thereon) and not yet paid.

          (b) "Across-the-Board  Salary  Reduction"  shall  mean a  reduction in
     Employee's  Base Salary  that is a part of,  and is  at a level  consistent
     with, a reduction in the base  salaries paid to substantially all employees
     of Company  who are  parties to an  agreement with  the Company  that would






     provide them with severance and other  termination benefits in the event of
     an involuntary termination of employment by the Company without cause prior
     to the occurrence of a Change in Control.

          (c) "Base Salary"  shall mean Employee's annualized base salary at the
     rate in effect  at the relevant  date or event  as reflected  in Employer's
     regular payroll records.

          (d) "Change in Control" shall mean an event that constitutes a "change
     in control" as defined in  Parent's Long-Term Incentive  Plan (the "LTIP"),
     as in effect on the Effective Date or as  subsequently amended from time to
     time (except that any amendment to such definition adopted (1) on or within
     180 days prior to a Change in Control or Potential Change in Control or (2)
     on or  after a  Potential  Change  in  Control  shall  not  be  applied  in
     determining  the definition of  such term  under this Agreement unless such
     amendment is favorable to Employee).

          (e) "Date of Termination" shall mean

              (1) In the case of a termination for which a Notice of Termination
          is required,  the date of receipt of such Notice of Termination or, if
          later, the date specified therein; and

              (2) In all  other  cases,  the  actual  date on  which  Employee's
          employment terminates.

          (f) "Disability"  shall mean  Employee's physical or mental impairment
     or incapacity of sufficient severity such that

              (1) In the opinion  of a qualified  physician selected  by Parent,
          after  taking  into  account  all  reasonable  accommodations that the
          Company has  made or  could make,  Employee is  unable to  continue to
          perform  Employee's duties  and responsibilities as an employee of the
          Company; or

              (2) Employee's condition entitles Employee to long-term disability
          benefits under any employee  benefit plan maintained by the Company in
          which Employee participates.

     For purposes of subparagraph (f)(1), Employee agrees to provide such access
     to Employee's medical  records and to  submit to such physical examinations
     or medical tests as, in the opinion of the physician selected by Parent, is
     reasonably necessary to make the  determination  required as to  Employee's
     ability  to  perform  Employee's  duties  and  responsibilities.   If  such
     physician is  unable to  render an  opinion  as to  Employee's  ability  to
     perform  such duties  and  responsibilities  due to Employee's  failure  to
     provide such  access to any of  Employee's medical records  or to submit to
     any such examination or test (unless, in the opinion of such physician such
     failure  is a  direct result of Employee's  physical or mental impairment),
     any failure  by Employee to  perform Employee's duties and responsibilities
     shall be  deemed not  to be on  account of  Employee's  physical or  mental
     impairment or incapacity.

          (g) "Earned Salary" shall mean the Base Salary earned by Employee, but
     unpaid, through Employee's Date of Termination.



                                      -2-





          (h) "Excessive Salary Reduction" shall mean

               (1) A reduction in  Employee's Base Salary that is not an Across-
          the-Board Salary Reduction and that, when combined with the net effect
          of all prior reductions in  Employee's Base  Salary (other  than prior
          reductions that were  Across-the-Board Salary Reductions),  results in
          the Base Salary  then payable  to Employee being  less than 80% of the
          highest Base Salary which Employee has ever  received from the Company
          (as reflected in Employer's regular payroll records); or

               (2) A reduction  in  Employee's Base  Salary  (whether or  not an
          Across-the-Board  Salary Reduction) that,  when combined with  the net
          effect of  all prior  reductions in Employee's Base Salary (whether or
          not Across-the-Board  Salary Reductions),  results in  the Base Salary
          payable to  Employee being  less than 65% of  the highest  Base Salary
          which Employee has  ever received  from the  Company (as  reflected in
          Employer's regular payroll records).

          (i) "Management Committee" shall mean the group of officers of Parent,
     as the same may be  constituted from time  to time during  the term of this
     Agreement that is primarily responsible for establishing strategy,  overall
     policy  and  the  business  plan  for Parent,  and approving  all  material
     business decisions affecting Parent.

          (j) "Normal Retirement Date" shall mean the date on which Employee
     attains age 60.

          (k) "Notice of Termination"  shall mean a written  notice given by the
     party effecting the termination of Employee's employment which shall

               (1) Indicate the specific termination provision in this Agreement
          relied upon;

               (2) Set forth  in reasonable  detail the  facts and circumstances
          claimed to  provide a  basis for  termination of Employee's employment
          under the provision so indicated; and

               (3) If the  Date of Termination is other than the date of receipt
          of such notice, specify  the Date of  Termination (which date shall be
          not more than 30 days after the giving of such notice).


     The failure by Employee or Parent or Employer to set forth in the Notice of
     Termination  any fact  or circumstance  which  contributes to  a showing of
     Termination for Good Reason or Termination  for Cause  shall not  waive any
     right of such  party hereunder  or preclude  such party from asserting such
     fact or circumstance in enforcing such  party's  rights  hereunder.  In the
     event  that a  Potential  Change in  Control  has  occurred,  any Notice of
     Termination  by Parent or  Employer  intended to  effect a  Termination for
     Cause  must be  given with 45  days of Parent  or Employer's  having actual
     knowledge of the events giving rise to Termination for Cause.

          (l) "Potential  Change in Control" shall mean the occurrence of any of
     the following events:


                                      -3-





               (1)  Any  person  or  group  shall  have  announced  publicly  an
          intention to effect a Change in Control, or commenced any action (such
          as the commencement of a tender offer for Parent's common stock or the
          solicitation of proxies for the election of any of Parent's directors)
          that,  if successful,  could  reasonably be  expected to result in the
          occurrence of a Change in Control;

               (2) Parent  enters  into an  agreement the  consummation of which
          would constitute a Change in Control; or

               (3) Any other event occurs which the Board of Directors of Parent
          (the "Board") declares to be a Potential Change in Control.

          (m) "Separation Payment"  shall mean any lump sum payment in excess of
     Earned  Salary  and  Accrued  Obligations  payable to  Employee  under this
     Agreement.

          (n) "Termination for  Cause" shall  mean a  termination of  Employee's
     employment by the Company following the occurrence of any of the following:

               (1)  Employee's   continued  failure   to  substantially  perform
          Employee's duties and  responsibilities (other  than any  such failure
          resulting   from   Employee's   physical  or   mental   impairment  or
          incapacity);

               (2) Employee's  engaging in  fraud or  other  misconduct  that is
          injurious to the Company, monetarily or otherwise;

               (3) Employee's engaging in insubordination;

               (4) Employee's  violation  of, or  failure to  comply  with,  any
          material written policy, guideline, rule or regulation of the Company;

               (5) Employee's  conviction  of   (or  plea  of   guilty  or  nolo
          contendere  to a  charge of)  any felony, or any  crime or misdemeanor
          involving moral turpitude or financial misconduct;

               (6) Employee's failure,  following a written request from Parent,
          reasonably to cooperate (including, without limitation, the refusal by
          Employee  to be  interviewed or  deposed,  or to  give  testimony)  in
          connection with any investigation or  proceeding,  whether internal or
          external (including, without limitation, by any governmental or quasi-
          governmental  agency) into the business practices or operations of the
          Company; or

               (7)  A  material  violation  by  Employee  of  the  provisions of
          paragraphs 5 or 6 of this Agreement.

          (o) "Termination  for  Good  Reason"   shall  mean  a  termination  of
     Employee's employment by Employee within 30 days after

               (1) the  earlier of receipt by  Employee of (i) written notice of
          an Excessive Salary Reduction and (ii)  Employee's first paycheck that
          reflects an Excessive Salary Reduction; or


                                      -4-





               (2) if Employee is an officer of Parent or Employer, the demotion
          of Employee to either a  non-officer   position or an officer position
          with  such  entity that  is  junior  to the  officer position  held by
          Employee  immediately  prior to such demotion, provided, however, that
          if Employee is a member of the Management Committee at any time during
          this Agreement, removal from, or exclusion from regular  participation
          as a  member of,  the  Management  Committee  shall be deemed  to be a
          demotion to a junior officer  position on  the date Employee  receives
          written notice from the Company of such removal or exclusion or, if no
          such notice is given,  the date Employee has actual  knowledge of such
          removal or exclusion.

     3. Termination of Employment, Relocation.

          (a) Right to Terminate.  Nothing in this Agreement  shall be construed
     in any  way to  limit the  right of  the  Company  to terminate  Employee's
     employment, with or without cause,  or for Employee to terminate Employee's
     employment with  the Company,  with or without reason;  provided,  however,
     that the  Company and  Employee must  nonetheless comply  with any  duty or
     obligation  such party  has  at  law  or  under  any  agreement  (including
     paragraphs 5 and 6 of this Agreement) between the parties.

          (b) Termination due to Death or Disability. Employee's employment with
     the Company shall be terminated upon Employee's death. By written notice to
     the other party,  either the Company or  Employee may terminate  Employee's
     employment due to Disability.

          (c) Relocation.  Nothing in  this Agreement  shall be construed in any
     way to  limit  the  right of  the  Company  to require  Employee to perform
     Employee's services  on behalf  of the Company  at a  different location or
     locations than the one at which Employee was performing Employee's services
     immediately  prior to the date hereof,  or to require the Company to pay or
     provide any  benefits to Employee on account of such relocation, other than
     to the extent  benefits would  be payable  to Employee  under the Company's
     applicable relocation policy as in effect at the relevant time.

     4. Amounts Payable Upon Termination of Employment. The following provisions
shall apply to any termination of Employee's employment:

          (a)  Death,  Disability  or  Normal  Retirement.  In  the  event  that
     Employee's  employment  terminates due to  Employee's  death  or Disability
     (regardless of whether such Disability termination is initiated by Employee
     or the Company), or due to the voluntary  retirement by  Employee (which is
     not a Termination for Good Reason)  at or after attaining Employee's Normal
     Retirement  Date,   Parent  or  Employer   shall  pay  Employee   (or,   if
     applicable, Employee's beneficiaries or legal representative(s)):

               (1) The Earned Salary, as soon as practicable  (but not more than
          10 days) following Employee's Date of Termination;

               (2) The Accrued Obligations,  in accordance  with applicable  law
          and  the  provisions  of  any  applicable  plan,  program,  policy  or
          practice; and

               (3) A Separation  Payment in  an amount  equal to Employee's Base
          Salary,  which  shall be  paid,  in  all cases  other  than  voluntary
          retirement  on  or  after  Normal  Retirement  Date,  within   10 days


                                      -5-





          following  Employee's  Date  of  Termination,  and,  in  the  case  of
          voluntary retirement on or after Normal Retirement Date,  6 months and
          1 day after Employee's Date of Termination.

          (b) Cause  and  Voluntary  Termination.  If  Employee's  employment is
     terminated by the  Company  in a  Termination for  Cause or  voluntarily by
     Employee (other than in a Termination for Good Reason or at or after Normal
     Retirement Date), Parent or Employer shall pay Employee

               (1) The Earned Salary,  as soon as practicable (but not more than
          10 days) following Employee's Date of Termination; and

               (2) The  Accrued  Obligations, in  accordance with applicable law
          and  the  provisions  of  any  applicable  plan,  program,  policy  or
          practice.

          (c) Termination  for  Good  Reason  or  Not  for  Cause.  If  Employee
     terminates Employee's employment in a Termination  for Good Reason,  or the
     Company terminates  Employee's employment  for any reason other  than those
     described in paragraphs 4(a) and (b) above, Parent or Employer shall pay or
     shall provide to Employee the following benefits and compensation:

               (1) The Earned Salary,  as soon as practicable (but not more than
          10 days) following Employee's Date of Termination;

               (2) The Accrued Obligations,  in accordance  with  applicable law
          and  the  provisions  of  any  applicable  plan,  program,  policy  or
          practice;

               (3) A Separation Payment,  as soon  as practicable  (but not more
          than 10 days) following the expiration of the revocation period stated
          in the General Release Agreement described in subparagraph 4(d) below,
          in an amount equal to the sum of

                   (i) The Employee's Base Salary;

                  (ii) The  product of (A) the monthly amount that,  on the Date
               of  Termination,  Employee  would be  required to pay to continue
               coverage under the Employer's group health plan(s) (as defined by
               the  Consolidated  Omnibus  Budget  Reconciliation  Act  of  1985
               ("COBRA") for Employee and  Employee's  eligible  dependents,  if
               any,  covered  thereunder  immediately  prior  to   the  Date  of
               Termination and (B) 18;  provided,  however, that if  Employee is
               covered under group health plan(s) not subject to COBRA,  instead
               of including  this amount as part of the Separation  Payment, the
               Company  shall  either,  at  its election,  provide  Employee and
               Employee's  covered  dependents  continued  coverage  under  such
               medical plan, at its expense, for a number of months equal to the
               number specified  in this  subparagraph  (c)(3)(ii)(B) or include
               in  the Separation  Payment an  amount equal to the value of such
               continued coverage.  For the  avoidance of  doubt,  such  payment
               shall not in any way alter, modify or affect  Employee's right to
               (and the  conditions  upon which,  and the  period  during which,

                                      -6-





               Employee  may  elect  to)  continue  coverage  for  Employee  and
               Employee's eligible dependents under COBRA ; and

                 (iii) If the termination of employment is by the Company and if
               the Date  of  Termination is  less than  30 days  after the  date
               Notice of  Termination  is given, an  amount equal  to 1/12  (one
               twelfth) of Employee's Base Salary, which amount shall be paid in
               cash on the Date of Termination; and

              (4) Any  additional  rights that  may be  afforded to  Employee in
         accordance with the  terms of the LTIP  with respect to awards  made to
         Employee  thereunder  which  are  not  vested  as  of   such  Date   of
         Termination.

         (d) Separation  Payment  Contingent  on Release. Any Separation Payment
     payable  to  Employee  under  subparagraph 4(c)  shall be  subject to,  and
     contingent upon,  Employee's  execution  and  non-revocation  of  a General
     Release Agreement in favor  of the  Company in  substantially the  form and
     substance as the one attached hereto as Schedule A.

     5.  Nonpublic Information.

         (a) Acknowledgement of  Access.  Employee  hereby acknowledges that, in
     connection  with  Employee's  employment  with  the Company,  Employee  has
     received, and will continue  to receive,  various information regarding the
     Company and its business,  operations and affairs. All such information, to
     the extent not publicly available other than as a result of a disclosure by
     Employee in  violation of  this  Agreement, is  referred to  herein  as the
     "Nonpublic Information."

         (b) Agreement to  Keep  Confidential. Employee hereby agrees that, from
     and after the  Effective Date and continuing  until  3 years  following the
     Employee's  Date   of  Termination,   Employee  will   keep  all  Nonpublic
     Information confidential and will not, without the prior written consent of
     the Board or the President of Parent, disclose any Nonpublic Information in
     any  manner  whatsoever  or use any  Nonpublic  Information  other  than in
     connection  with the  performance  of Employee's  services to  the Company;
     provided,  however,  that the  provisions  of this  subparagraph  shall not
     prevent Employee from

              (1) Disclosing any  Nonpublic Information to any other employee of
         the  Company or  to any representative or agent of the Company (such as
         an  independent  accountant,  engineer, attorney  or financial advisor)
         when  such  disclosure  is  reasonably  necessary  or  appropriate  (in
         Employee's  judgment) in connection with the performance by Employee of
         Employee's duties and responsibilities;

              (2) Disclosing any Nonpublic Information as required by applicable
         law, rule, regulation or legal process (but only after compliance with
         the provisions of subparagraph (c) of this paragraph); and

              (3) Disclosing any information about this Agreement and Employee's
         other compensation arrangement to Employee's spouse, financial advisors
         or  attorneys,  or to  enforce  any  of  Employee's  rights  under this
         Agreement.

                                      -7-





         (c) Commitment to  Seek  Protective  Order.  If  Employee is  requested
     pursuant to, or required by,  applicable  law, rule,   regulation  or legal
     process to disclose any Nonpublic Information,  Employee will notify Parent
     promptly  so  that  the  Company  may  seek a  protective  order  or  other
     appropriate remedy or, in Parent's  sole discretion, waive  compliance with
     the terms of this  subparagraph,  and Employee will fully  cooperate in any
     attempt  by the  Company to  obtain  any  such  protective  order or  other
     remedy.  If no such  protective  order or other  remedy is obtained,  or if
     Parent waives compliance with the terms of this subparagraph, Employee will
     furnish or disclose only that portion of the Nonpublic  Information  as is
     legally  required  and  will  exercise  all  reasonable  efforts  to obtain
     reliable   assurance  that  confidential  treatment  will  be  accorded the
     Nonpublic Information that is so disclosed.

     6.   Non-Solicitation and Non-Interference.

         (a) Non-Solicitation  of Employees.  During the  period  of  Employee's
     employment with the  Company  (the "Employment  Period")  and during  the 2
     year period  following  Employee's  Date of  Termination  (the "Restriction
     Period"),  Employee  shall not  directly or indirectly induce  any employee
     of the Company to  terminate employment  with such  entity,  and  shall not
     directly   or  indirectly,   either  individually   or  as   owner,  agent,
     employee,  consultant  or  otherwise,  employ  or offer  employment  to any
     person who is  or was  employed  by the  Company  unless such  person shall
     have  ceased to be  employed by  the Company  for a  period of  at  least 6
     months.

         (b) Non-Interference with Business Relationships. During the Employment
     Period  and  the  Restriction  Period,   Employee  shall  not  directly  or
     indirectly take any  actions which  can reasonably be  expected to,  or are
     intended to, disrupt or  interfere with in any significant way any existing
     relationship that the Company has with any third party.

         (c) No Disparaging Comments. Except to the extent otherwise required or
     compelled  at law or  under  subpoena,  during the  Employment  Period  and
     the  Restriction  Period,  Employee  shall refrain  from making  any public
     derogatory or  disparaging  comment  concerning  the  Company or any of the
     current  or  former  officers,  directors  or  employees  of  the  Company.
     Notwithstanding   the  immediately   preceding  sentence,   nothing  herein
     shall  be  construed  to  preclude Employee  from  enforcing any  rights or
     claims Employee  may have  against the  Company (or  to defend  against any
     claims by the Company) arising under this Agreement.

         (d)  Company   Property.   Promptly   following   Employee's   Date  of
     Termination,  Employee  shall return to  the  Company  all property  of the
     Company,  and  all  copies  thereof   in  Employee's  possession  or  under
     Employee's control.

     7.   Miscellaneous Provisions.

         (a)  No  Mitigation,  No  Offset.  Employee  shall not  be  required to
     mitigate  the  amount  of any  payment  provided for  in this  Agreement by
     seeking other  employment or  otherwise,  and the  amount  of  any  payment
     provided for in this  Agreement shall  not be reduced  by any  compensation
     earned by  Employee as  the result  of employment by another employer after
     the Date of  Termination or otherwise.  Except as  provided in subparagraph
     4(d),  Parent's or Employer's  obligation to make the payments provided for


                                      -8-






     in this Agreement and otherwise to  perform its obligations hereunder shall
     not be affected by  any circumstances,  including,  without limitation, any
     set-off, counterclaim, recoupment, defense or other right which the Company
     may have against  Employee or  others whether  by reason  of the subsequent
     employment of Employee or otherwise.

         (b) Arbitration. Except to the extent provided in paragraph  7(d),  any
     dispute or  controversy arising  under or in connection with this Agreement
     shall be resolved by binding arbitration.  The arbitration shall be held in
     Dallas,  Texas and except to the extent inconsistent  with this  Agreement,
     shall be conducted in accordance with  the Expedited Employment Arbitration
     Rules of the American  Arbitration  Association  then in effect at the time
     of the  arbitration,  and  otherwise in  accordance with  principles  which
     would be  applied by a court of  law or  equity.  The  arbitrator  shall be
     acceptable to both Parent and Employee.  If the parties  cannot agree on an
     acceptable arbitrator,  the dispute  shall  be  heard  by  a panel of three
     arbitrators,  one appointed by each of the parties and the third  appointed
     by the  other  two  arbitrators.  The  arbitrator  may  award  pre-judgment
     interest on any amount  found to be  due under this Agreement at a rate not
     in excess  of the  rate that  would be  payable with  respect to  judgments
     rendered in a Texas state court.

         (c) Attorney Fees.  All legal fees and other costs incurred by Employee
     in connection with the resolution of any dispute or controversy under or in
     connection  with  this  Agreement  shall be  reimbursed  by the  Company to
     Employee  if such dispute or controversy  is resolved in favor of Employee.
     The  Company  shall be  responsible for,  and shall pay, all legal fees and
     other costs incurred by the Company in  connection  with the  resolution of
     any dispute or  controversy  under or in  connection with  this  Agreement,
     regardless of whether such dispute or controversy  is resolved in  favor of
     the Company or Employee.

         (d) Equitable Relief Available. Employee  acknowledges that remedies at
     law  may  be inadequate  to protect  the  Company  against  any  actual  or
     threatened  breach by  Employee of  the  provisions  of paragraphs  5 or 6.
     Accordingly, without prejudice to any  other rights or  remedies  otherwise
     available to the Company,  Employee agrees that  the Company shall have the
     right to  equitable and injunctive relief (without  requirement to post any
     bond) to prevent any breach of the provisions of paragraphs 5 or 6 (without
     any requirement  to post  any bond),  as well  as to  such damages or other
     relief as may be available to the Company by reason of any such breach that
     does occur.

         (e) Not A Contract of Employment. Employee acknowledges  that that this
     Agreement  is  not  an  "employment  agreement"  or  "employment  contract"
     (written  or  otherwise),  as  either  term  is  used  or  defined  in,  or
     contemplated by or under

             (1) Parent's LTIP;

             (2) Any other plan or agreement to which the Company is a party; or

             (3) Applicable statutory, common or case law.

         (f) Notices.  Any Notice  of Termination  or other communication called
     for by the terms of this Agreement shall be in writing and either delivered
     personally or by registered  or certified mail  (postage prepaid and return


                                      -9-





     receipt requested) and shall be deemed given when received at the following
     addresses (or at such  other address  for a  party as shall be specified by
     like notice):

             (1) If to Parent,  Employer  or the  Company,  5205 North  O'Connor
         Boulevard, Suite 900, Irving, Texas 75039, Attention: General Counsel;

             (2) If to  Employee,  the  address  of  Employee  set  forth  below
         Employee's signature on the signature page of this Agreement.

         (g)  Assignment.  Employer  may  assign   its  duties  and  obligations
     hereunder to  any other  direct  or indirect,  majority-owned subsidiary of
     Parent,  but shall remain  secondarily  liable for the  performance of this
     Agreement  by Parent  and/or any  such assignee.  Except  pursuant  to  the
     immediately preceding sentence or an assumption by a successor described in
     subparagraph (h) of this paragraph,  the rights and  obligations  of Parent
     and Employer pursuant to this Agreement may not be assigned, in whole or in
     part,  by Parent or  Employer to  any other  person or  entity  without the
     express written consent of Employee. The rights and obligations of Employee
     pursuant to this  Agreement may not be assigned,  in whole  or in part,  by
     Employee to any other  person or entity without the express written consent
     of the Board.

         (h) Successors.  Parent shall require  any successor (whether direct or
     indirect) to all  or substantially all of the business  or assets of Parent
     (whether by  purchase of securities,  merger, consolidation, sale of assets
     or otherwise), to expressly assume and agree to  perform the obligations to
     be performed by the Company under this Agreement in the same  manner and to
     the same extent  that the Company would be  required to perform  if no such
     succession  had taken place.  This Agreement shall be binding on, and shall
     inure to the benefit of, Parent,  Employer, the Company, Employee and their
     respective   successors,   permitted    assigns,    personal   and    legal
     representatives,  executors,  administrators, heirs, distributees, devisees
     and legatees, as applicable.

         (i) Amendments  and  Waivers.  No  provision of  this  Agreement may be
     amended or otherwise  modified, and no right of any party to this Agreement
     may be waived,  unless such amendment,  modification or waiver is agreed to
     in a written instrument signed by Employee and Company. No waiver by either
     party hereto of,  or compliance with,  any condition  or provision  of this
     Agreement to be  performed  by  the other  party hereto  shall be  deemed a
     waiver of similar or  dissimilar provisions or conditions at the same or at
     any prior or subsequent time.

         (j) Complete Agreement.  This  Agreement  replaces  and  supersedes all
     prior  agreements,  including,  but not limited to, the Severance Agreement
     between  Parent and Employee,  as in effect  immediately prior  to the date
     hereof,  among the parties with respect to payments to be  made to Employee
     upon the termination of Employee's employment prior to a Change in Control,
     and the provisions of this Agreement constitute the complete  understanding
     and  agreement  among the  parties with  respect to  such  subject  matter.
     Nothing in this subparagraph (j) is intended  to, or shall be construed  to
     (1)  supercede  the  Change in  Control  Agreement or (2)  limit Employee's
     rights under the LTIP  or any other  Company   plan,   program,   policy or
     practice  (other  than  any plan,  program,  policy  or practice  primarily
     providing  severance or other termination benefits) generally applicable to
     similarly situated employees.



                                      -10-





         (k) Governing Law. THIS AGREEMENT IS BEING MADE AND EXECUTED IN, AND IS
     INTENDED  TO BE  PERFORMED IN,  THE STATE  OF TEXAS AND  SHALL BE GOVERNED,
     CONSTRUED, INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE SUBSTANTIVE LAWS
     OF THE STATE OF TEXAS.

         (l)  Counterparts.   This  Agreement   may  be   executed  in   several
     counterparts,  each of which shall  be deemed to be an original, but all of
     which together will constitute one and the same agreement.

         (m) Construction.  The  captions  of the  paragraphs, subparagraphs and
     sections of this Agreement have been inserted as a matter of convenience of
     reference only and  shall not affect  the meaning or construction of any of
     the terms or  provisions  of this Agreement.  Unless  otherwise  specified,
     references  in this Agreement to a  "paragraph," "subparagraph," "section,"
     "subsection"  or "schedule"  shall be  considered to be  references  to the
     appropriate  paragraph,  subparagraph,  section,  subsection  or  schedule,
     respectively,  of  this  Agreement.  As used  in this  Agreement,  the term
     "including" shall mean "including, but not limited to."

         (n) Validity  and  Severability.   If  any  term  or provision  of this
     Agreement is held to be illegal, invalid or unenforceable under the present
     or future laws effective  during the term of this Agreement,  (1) such term
     or  provision  shall  be  fully  severable,  (2)  this  Agreement  shall be
     construed  and enforced as if such term or provision had never  comprised a
     part of this  Agreement and (3) the remaining  terms and provisions of this
     Agreement  shall remain in  full force and effect and shall not be affected
     by the  illegal,  invalid  or  unenforceable  term  or provision  or by its
     severance  from  this  Agreement.  Furthermore,  in  lieu of such  illegal,
     invalid  or  unenforceable   term  or  provision,   there  shall  be  added
     automatically as a part of this Agreement,  a term or  provision as similar
     to such  illegal,  invalid or  unenforceable  term or provision  as may  be
     possible and be legal, valid and enforceable.

         (o) Survival. Notwithstanding  anything else in this  Agreement  to the
     contrary,  paragraphs  5, 6 and 7,  and, to the extent that any of Parent's
     and Employer's obligations thereunder have not  theretofore been satisfied,
     paragraph 4 of this Agreement shall survive the termination hereof.

         (p) Joint and Several Liability.  Parent and  Employer (or any assignee
     of Employer pursuant to paragraph 7(g)) shall each be jointly and severally
     liable to Employee  hereunder with regard to any  obligation imposed by the
     terms hereof on Parent or Employer.


                            (SIGNATURE PAGE ATTACHED)



                                      -11-







     In  Witness  Whereof,  the  parties  have  executed  this  Agreement  to be
effective as of the Effective Date.


                        PIONEER NATURAL RESOURCES COMPANY


                        By:    /s/ Mark S. Berg
                               --------------------------
                        Name:  Mark S. Berg
                        Title: EVP & General Counsel


                        PIONEER NATURAL RESOURCES USA, INC.

                        By:   /s/ Mark S. Berg
                              ---------------------------
                        Name: Mark S. Berg
                        Title: EVP & General Counsel


                        EMPLOYEE:

                        /s/ William F. Hannes
                        ---------------------------------


                        Address:

                        5205 North O'Connor Boulevard, Suite 900,
                        Irving, Texas 75039


                                      -12-







                                   Schedule A


                            GENERAL RELEASE AGREEMENT

NOTICE:  You should  thoroughly review and understand the effect of this General
Release Agreement  ("Release") before signing it, and you are advised to discuss
this document with your attorney.  In accordance  with the  requirements  of the
Older  Workers  Benefit  Protection  Act  ("OWBPA"),  you are  allowed  at least
[number]  days from the date of your  receipt of this  document to consider  the
offer  made to you and to return an  executed  copy of this  Release to the Vice
President  Administration.  Additionally,  after you have executed this Release,
you have seven (7) days to reconsider and revoke your agreement.

GENERAL RELEASE:  In consideration of my acceptance of the payments and benefits
offered to me under the Pioneer Natural Resources  Company  Severance  Agreement
effective  [date][,  as  amended,]  (the  "Agreement"),  I  hereby  release  and
discharge Pioneer Natural Resources Company (the "Company") and its subsidiaries
and affiliates, and the officers,  directors,  employees,  agents, predecessors,
successors,  and assigns of such entities  (collectively the "Released  Parties)
from any and all claims,  liabilities,  demands,  and causes of action, known or
unknown,  fixed or  contingent,  which I have or claim  against any of them as a
result of my  employment  the  termination  of my employment or any other act or
omission  relating  to any  matter  arising  on or  before  the date I sign this
Release,  including but not limited to claims arising under federal,  state,  or
local laws prohibiting employment discrimination, including, but not limited to,
the Age  Discrimination  in Employment  Act, and including,  but not limited to,
claims arising out of any legal restrictions,  contractual or otherwise,  on the
Company's  right to  terminate  the  employment  of its  employees  (any and all
"Potential  Claims"),  and I do  hereby  agree not to file a  lawsuit,  arbitral
proceeding or other legal action to assert such Potential  Claims. I acknowledge
and agree that the  Released  Parties  may recover  from me any loss,  including
attorney's fees and costs of defending against any such legal action,  that they
may suffer arising out of my breach of this Release.

I  understand  that  this  Release  is final  and  binding,  and I agree  not to
challenge its enforceability other than as permitted by applicable laws. If I do
challenge the  enforceability  of this Release other than with respect to claims
of age  discrimination,  I agree  initially  to tender to the  Company an amount
equivalent to the payment and benefits I received pursuant to the Agreement, and
invite the  Company  to retain  such  amount  and agree  with me to cancel  this
Release.  In the event the Company accepts this offer,  the Company shall retain
such amount and this  Release  will be void.  In the event the Company  does not
accept such offer,  the Company  shall so notify me, and shall place such amount
in an  interest-bearing  escrow account pending the resolution of any dispute as
to  whether  this  Release  shall be set  aside  and/or  otherwise  be  rendered
unenforceable.  If I am successful in  challenging  the  enforceability  of this
Release as to age discrimination  claims,  then, to the extent permitted by law,
any damages I may recover for those  claims will be offset by any  payments  and
benefits made to me under the Agreement.

I acknowledge and agree that the Company has no legal  obligation to provide the
payments and/or benefits  offered to me under the Agreement,  except in exchange
for this Release, and my acceptance of such payments and benefits constitutes my
agreement to all terms and conditions set forth in this Release.

I acknowledge  and agree that,  except to the extent  otherwise  provided in the
Agreement or  prohibited by law (for example by the OWBPA with respect to claims
of age  discrimination),  this  Release  constitutes  a  waiver  of any  and all
Potential Claims that I have or may have against the Released Parties. I further
acknowledge  and agree that this Release has no effect on any obligations I have
assumed under the Agreement with respect to  confidentiality,  non-solicitation,
non-interference  and other such  matters  and that any such  obligations  shall
survive  my  execution  of this  Release  in  accordance  with the  terms of the
Agreement.

I  acknowledge  that I have  [number]  days  to  consider  this  Release  before
executing it, although I may execute it any time during this [number] day period
(but not  before my last day of  employment),  that I may  revoke  this  Release
within 7 days  after I  execute  it by  written  notice  to the  Company's  Vice
President of  Administration  and that this Release will not become effective or
enforceable,  and the payments and benefits offered under the Agreement will not
be  made  or  provided,  until  expiration  of  this  7 day  period  without  my
revocation.

I have  carefully  read  and  fully  understand  all of the  provisions  of this
Release. I further acknowledge that entering into this General Release Agreement
is  knowing  and  voluntary  on my part,  that I have had a  reasonable  time to
deliberate regarding its terms, and that I have had the right to consult with an
attorney prior to executing this Release if I so desired.

- ---------------------------------         -------------------------------------
Date signed:                              Signature of [employee]

- ---------------------------------         -------------------------------------
Date signed:                              Witness