Document:

<PAGE>
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                                                                    EXHIBIT 10.8

                      NON-QUALIFIED STOCK OPTION AGREEMENT

                              MARINER ENERGY, INC.
                              STOCK INCENTIVE PLAN

<TABLE>
<S>              <C>
Optionee:        ______________

Date of Grant:   March 11, 2005

NQO Number:      ______________
</TABLE>

1.   Grant of Options. Mariner Energy, Inc. (the "Company") hereby grants to you
     the right and option ("Options") to purchase all or any part of an
     aggregate of [____] Common Shares ("Shares") of Mariner Energy, Inc. on the
     terms and conditions set forth herein and in the Mariner Energy, Inc. Stock
     Incentive Plan (the "Plan"), which is incorporated herein by reference as a
     part of this Agreement. This grant of Options is not intended to qualify as
     incentive stock options. In the event of any conflict between the terms of
     this Agreement and the Plan, the Plan shall control. Capitalized terms used
     but not defined in this Agreement shall have the meaning attributed to such
     terms under the Plan, unless the context requires otherwise.

2.   Exercise Price. The exercise price per Share purchased pursuant to the
     exercise of the Options shall be $14.00, subject to adjustment as provided
     in the Plan.

3.   Vesting and Exercise of Option. Subject to the further provisions of this
     Agreement, the Options shall become vested and may be exercised in
     accordance with the following schedule, by written notice to the Company at
     its principal executive office addressed to the attention of its Secretary
     (or such other officer or employee of the Company as the Company may
     designate from time to time):

<TABLE>
<CAPTION>
      Anniversary of        Cumulative
       Date of Grant    Vested Percentage
     ----------------   -----------------
<S>                     <C>
     Less than 1 year             0%
          1 year             33 1/3%
          2 years            66 2/3%
      3 years or more           100%
</TABLE>

     Notwithstanding the above schedule, but subject to the further provisions
     hereof, upon the occurrence of the following events the Options shall vest
     and become exercisable as provided below:

<PAGE>

     (a)  Disability. If your employment with the Company terminates by reason
          of a disability that entitles you to benefits under the Company's or a
          Subsidiary's long-term disability plan, the Options shall become fully
          vested and, subject to the further provisions of this Agreement, may
          be exercised at any time during the one-year period following such
          termination by you or by your guardian or legal representative (or, if
          you die during such one-year period, by your estate or the person who
          acquires the Options by will or the laws of descent and distribution).

     (b)  Death. If you die while in the employ of the Company, the Options
          shall become fully vested and, subject to the further provisions of
          this Agreement, your estate (or the person who acquires the Options by
          will or the laws of descent and distribution) may exercise the Options
          at any time during the one-year period following the date of your
          death.

     (c)  Termination For Cause. If your employment with the Company is
          terminated by the Company for Cause (as defined below), the Options,
          whether or not then vested, shall immediately cease to be exercisable
          upon such termination and shall be cancelled automatically without
          payment. Cause shall mean (i) your material failure to perform your
          duties, (ii) your conviction of or plea of nolo contendere for any
          felony or any misdemeanor involving moral turpitude, dishonesty, fraud
          or breach of trust, (iii) your willful engagement in gross misconduct
          in the performance of your duties, (iv) your substance abuse, (v) your
          misappropriation of funds, or (vi) your disparagement of the Company
          or any Subsidiary or any of their respective managements or employees.

     (d)  Other Terminations. If your employment with the Company is terminated
          for any reason other than as provided in paragraphs 3(a), (b) and (c)
          above, the Options, to the extent vested on the date of your
          termination, may be exercised, subject to the further provisions of
          this Agreement, at any time during the three month period following
          such termination by you or by your guardian or legal representative
          (or by your estate or the person who acquires the Options by will or
          the laws of descent and distribution or otherwise by reason of your
          death if you die during such period), but only as to the vested number
          of Shares, if any, that you were entitled to purchase hereunder as of
          the date your employment so terminates.

     (e)  Change of Control. If you have been continuously employed by the
          Company from the Date of Grant to the date upon which a Change of
          Control occurs, then the Options shall become fully vested and
          exercisable upon the date of such Change of Control.

     For purposes of this Agreement, "Change of Control" shall mean (i) after
     the Date of Grant, any person or group of affiliated or associated persons
     acquires more than 35% of the voting power in the Company; (ii) the
     consummation of a sale of all or substantially all of the assets of the
     Company; or (iii) the dissolution of the Company; or (iv) the consummation
     of any merger, consolidation, or reorganization involving the Company in
     which, immediately after giving effect to such merger, consolidation or
     reorganization,

                                       -2-

<PAGE>

     less than 51% of the total voting power of outstanding stock of the
     surviving or resulting entity is then "beneficially owned" (within the
     meaning of Rule 13d-3 under the Securities Exchange Act of 1934, as
     amended) in the aggregate by the stockholders of the Company immediately
     prior to such merger, consolidation or reorganization. Notwithstanding the
     foregoing, a Change of Control shall not include any acquisition resulting
     from the consummation of the private placement offering of common stock of
     the Company under Rule 144A and/or Regulation D prior to March 31, 2005.

     For purposes of this Agreement, "employment with the Company" shall include
     being an employee or a director of the Company or a Subsidiary.

     There is no minimum or maximum number of Shares that must be purchased upon
     exercise of the Options. Instead, the Option may be exercised, at any time
     and from time to time, to purchase any number of Shares that are then
     vested and exercisable according to the provisions of this Agreement.

     All Options that are not vested on your termination of employment as
     provided above shall be automatically cancelled without payment upon your
     termination.

4.   Term. Notwithstanding any of the foregoing, the Options shall not be
     exercisable in any event after the expiration of 10 years from the Date of
     Grant.

5.   Payment of Exercise Price. The purchase price of the Shares as to which the
     Options are exercised shall be paid in full at the time of exercise (a) in
     cash (including by check acceptable to the Company), (b) if the Shares are
     readily tradable on a national securities market or exchange, through a
     "cashless broker exercise" program approved in advance by the Company, (c)
     any other method approved by the Company, including, with the consent of
     the Committee, by withholding a number of Shares that would otherwise be
     delivered on exercise of the Option that have an aggregate Fair Market
     Value that does not exceed the aggregate exercise price for the Options
     being then exercised, or (d) any combination of the foregoing. No fraction
     of a Share shall be transferred upon exercise of the Options. Unless and
     until a certificate or certificates representing such Shares shall have
     been transferred by the Company to you, you (or the person permitted to
     exercise the Options in the event of your death) shall not be or have any
     of the rights or privileges of a shareholder of the Company with respect to
     Shares acquirable upon an exercise of the Options.

6.   Withholding of Tax. To the extent that the exercise of an Option results in
     the receipt of compensation by you with respect to which the Company or a
     Subsidiary has a tax withholding obligation pursuant to applicable law,
     unless other arrangements have been made by you that are acceptable to the
     Company or such Subsidiary, you shall either deliver to the Company or the
     Subsidiary such amount of money as the Company or the Subsidiary may
     require to meet its withholding obligations under such applicable law or
     have the Company withhold a number of Shares that would otherwise be
     delivered on exercise or vesting that have an aggregate Fair Market Value
     that does not exceed the amount of taxes to be withheld; provided, however,
     that if you fail to satisfy the Company's or the Subsidiary's tax
     withholding obligations, the Company, in its sole

                                       -3-

<PAGE>

     discretion, may withhold a number of Shares that would otherwise be
     delivered on exercise or vesting that have an aggregate Fair Market Value
     equal to the amount of taxes required to be withheld. No delivery of Shares
     shall be made pursuant to the exercise of an Option under this Agreement
     until you have paid or made arrangements approved by the Company or the
     Subsidiary to satisfy in full the applicable tax withholding requirements
     of the Company or Subsidiary.

7.   Restrictions. By accepting this grant, you agree that the Shares which you
     may acquire by exercising the Options will not be sold or otherwise
     disposed of in any manner which would constitute a violation of any
     applicable federal or state securities laws. You also agree that (i) the
     book entry made (or the certificates, if any are issued) representing the
     Shares purchased under the Options may bear such restriction, restrictions,
     legend or legends as the Committee deems appropriate in order to assure
     compliance with applicable securities laws, (ii) the Company may refuse to
     register the transfer of the Shares purchased under the Options on the
     transfer records of the Company if such proposed transfer would in the
     opinion of counsel satisfactory to the Company constitute a violation of
     any applicable securities law, and (iii) the Company may give related
     instructions to its transfer agent, if any, to stop registration of the
     transfer of the Shares purchased under the Options.

8.   Limitations Upon Transfer. All rights under this Agreement shall belong to
     you alone and may not be transferred, assigned, pledged, or hypothecated by
     you in any way (whether by operation of law or otherwise), other than by
     will or the laws of descent and distribution and shall not be subject to
     execution, attachment, or similar process. Upon any attempt by you to
     transfer, assign, pledge, hypothecate, or otherwise dispose of such rights
     contrary to the provisions in this Agreement or the Plan, or upon the levy
     of any attachment or similar process upon such rights, such rights shall
     immediately become null and void.

9.   Binding Effect. This Agreement shall be binding upon and inure to the
     benefit of any successors to the Company and all persons lawfully claiming
     under you.

10.  Entire Agreement. This Agreement and the Plan constitute the entire
     agreement of the parties with regard to the subject matter hereof and
     thereof, and contain all the covenants, promises, representations,
     warranties and agreements between the parties with respect to the Option
     granted hereby. Without limiting the scope of the preceding sentence, all
     prior understandings and agreements, if any, among the parties hereto
     relating to the subject matter hereof and thereof are hereby null and void
     and of no further force and effect.

11.  Modifications. Except as provided below, any modification of this Agreement
     shall be effective only if it is in writing and signed by both you and an
     authorized officer of the Company. Notwithstanding anything in the Plan or
     this Agreement to the contrary, if the Committee determines that the terms
     of this grant do not, in whole or in part, satisfy the requirements of new
     Section 409A of the Internal Revenue Code, the Committee, in its sole
     discretion, may unilaterally modify this Agreement in such manner as it
     deems

                                       -4-

<PAGE>

     appropriate to comply with such section and any regulations or guidance
     issued thereunder.

12.  Governing Law. This Agreement shall be governed by, and construed in
     accordance with, the laws of the State of Texas, without regard to
     conflicts of laws principles thereof.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed by
its duly authorized officer all effective as of the day and year first above
written.

                                       MARINER ENERGY, INC.

                                       By:
                                           -------------------------------------
                                           Scott D. Josey
                                           Chief Executive Officer and President

                                       -5-<PAGE>
                                                                    EXHIBIT 10.9

                      NON-QUALIFIED STOCK OPTION AGREEMENT

                              MARINER ENERGY, INC.
                              STOCK INCENTIVE PLAN

     Optionee:
                            ------------------------

     Date of Grant:              March 11, 2005

     NQO Number
                            ------------------------

1.   Grant of Options. Mariner Energy, Inc. (the "Company") hereby grants to
     you the right and option ("Options") to purchase all or any part of an
     aggregate of [______] Common Shares ("Shares") of Mariner Energy, Inc. on
     the terms and conditions set forth herein and in the Mariner Energy, Inc.
     Stock Incentive Plan (the "Plan"), which is incorporated herein by
     reference as a part of this Agreement. This grant of Options is not
     intended to qualify as incentive stock options. In the event of any
     conflict between the terms of this Agreement and the Plan, the Plan shall
     control. Capitalized terms used but not defined in this Agreement shall
     have the meaning attributed to such terms under the Plan, unless the
     context requires otherwise.

2.   Exercise Price. The exercise price per Share purchased pursuant to the
     exercise of the Options shall be $14.00, subject to adjustment as provided
     in the Plan.

3.   Vesting and Exercise of Option. Subject to the further provisions of this
     Agreement, the Options shall become vested and may be exercised in
     accordance with the following schedule, by written notice to the Company
     at its principal executive office addressed to the attention of its
     Secretary (or such other officer or employee of the Company as the Company
     may designate from time to time):

<Table>
<Caption>
                   Anniversary of                   Cumulative
                   Date of Grant                 Vested Percentage
                   -------------                 -----------------
<S>                                                   <C>
                  Less than 1 year                         0%
                      1 year                          33 1/3%
                      2 years                         66 2/3%
                  3 years or more                        100%
</Table>

     Notwithstanding the above schedule, but subject to the further provisions
     hereof, upon the occurrence of the following events the Options shall vest
     and become exercisable as provided below:

<PAGE>
     (a)  Disability. If you are entitled to benefits under Section 7(d) of
          your Employment Agreement entered into with the Company, dated
          February 7, 2005 ("Employment Agreement") or, if the Employment
          Agreement has terminated, your employment with the Company terminates
          by reason of a disability that entitles you to benefits under the
          Company's or a Subsidiary's long-term disability plan, the Options
          shall become fully vested and, subject to the further provisions of
          this Agreement, may be exercised at any time during the one-year
          period following such termination by you or by your guardian or legal
          representative (or, if you die during such one-year period, by your
          estate or the person who acquires the Options by will or the laws of
          descent and distribution).

     (b)  Death. If you die while in the employ of the Company, the Options
          shall become fully vested and, subject to the further provisions of
          this Agreement, your estate (or the person who acquires the Options by
          will or the laws of descent and distribution) may exercise the Options
          at any time during the one-year period following the date of your
          death.

     (c)  Termination by the Company other than for Cause. If your employment
          with the Company is terminated by the Company for any reason other
          than for Cause (as defined below), the Options shall become 50% vested
          (to the extent less than 50% vested) and, subject to the further
          provisions of this Agreement, may be exercised at any time during the
          three-month period following such termination by you or by your
          guardian or legal representative (or by your estate or the person who
          acquires the Options by will or the laws of descent and distribution
          or otherwise by reason of your death if you die during such period),
          but only as to the vested number of Shares (including the Shares, if
          any, that became vested under this Section 3(c)) that you were
          entitled to purchase hereunder as of the date your employment so
          terminates. For purposes of this Section 3, the term "Cause" shall
          have the have the meaning ascribed to such term in your Employment
          Agreement, or if the Employment Agreement has terminated, shall mean
          (i) a material failure to perform your duties, (ii) your conviction of
          or plea of nolo contendere for any felony or any misdemeanor involving
          moral turpitude, dishonesty, fraud or breach of trust, (iii) your
          willful engagement in gross misconduct in the performance of your
          duties, (iv) your substance abuse, (v) your misappropriation of funds,
          or (vi) your disparagement of the Company or any Subsidiary or any of
          their respective managements or employees.

     (d)  Termination For Cause or other than for Good Reason. Except as
          otherwise provided in Section 3(f) below, if your employment with the
          Company is terminated by the Company for Cause or by you other than
          for a Good Reason (as defined below) the Options, whether or not then
          vested, shall immediately cease to be exercisable upon such
          termination and shall be cancelled automatically without payment. For
          purposes of this Section 3, the term "Good Reason" shall have the
          meaning ascribed to such term in your Employment Agreement, or if the
          Employment Agreement has terminated, shall mean (i) a material adverse
          change in the nature or scope of your authorities, powers, duties and
          functions performed; (ii) a material reduction in your base salary or
          in the cash bonus opportunities

                                     - 2 -
<PAGE>
          made available to you, excluding opportunities under (A) any plan,
          program, arrangement or agreement providing for compensation in the
          form of overriding royalty interests or income from overriding royalty
          interests, (B) any equity-based compensation plans, programs,
          arrangements or agreements, including, but not limited to, stock
          options, and (C) 401(k) and profit-sharing plans; or (iii) your
          permanent place of employment with the Company is changed to a
          location that is more than 50 miles from your location prior to such
          change.

     (e)  For Good Reason.  Except as otherwise provided in Section 3(f) below,
          if your employment with the Company is terminated by the Company for
          Good Reason, the Options shall become 50% vested (to the extent less
          than 50% vested) and, subject to the further provisions of this
          Agreement, may be exercised at any time during the three-month period
          following such termination by you or by your guardian or legal
          representative (or by your estate or the person who acquires the
          Options by will or the laws of descent and distribution or otherwise
          by reason of your death if you die during such period), but only as to
          the vested number of Shares (including the Shares, if any, that became
          vested under this Section 3(e)) that you were entitled to purchase
          hereunder as of the date your employment so terminates.

     (f)  Change of Control.  Upon the occurrence of a Change of Control (as
          defined in your Employment Agreement entered into with the Company,
          dated February 7, 2005 ("Employment Agreement")) that occurs while you
          are employed by the Company or within nine months following a
          termination of your employment with the Company that entitles you to
          severance under Section 7(c) of your Employment Agreement, the Options
          shall become fully vested to the extent not already vested.

     For purposes of this Agreement, "employment with the Company" shall include
     being an employee or a director of the Company or a Subsidiary.

     There is no minimum or maximum number of Shares that must be purchased upon
     exercise of the Options. Instead, the Option may be exercised, at any time
     and from time to time, to purchase any number of Shares that are then
     vested and exercisable according to the provisions of this Agreement.

     All Options that are not vested on your termination of employment as
     provided above shall be automatically cancelled without payment upon your
     termination, except that if your employment with the Company terminated and
     you were entitled to severance benefits under Section 7(c) of your
     Employment Agreement, then the non-vested portion of this Option, if any,
     shall remain outstanding (but not exercisable) until the date that is nine
     months after your termination from the Company. If a Change of Control
     occurs during such nine month period, the non-vested portion of this Option
     that becomes vested as a result of such Change of Control may be exercised
     subject to the further provisions of this Agreement, at any time during the
     three month period following such Change of Control by you or by your
     guardian or legal representative (or by your estate or the

                                      -3-
<PAGE>

     person who acquires the Options by will or the laws of descent and
     distribution or otherwise by reason of your death if you die during such
     period).

4.   Term. Notwithstanding any of the foregoing, the Options shall not be
     exercisable in any event after the expiration of 10 years from the Date of
     Grant.

5.   Payment of Exercise Price. The purchase price of the Shares as to which
     the Options are exercised shall be paid in full at the time of exercise
     (a) in cash (including by check acceptable to the Company), (b) if the
     Shares are readily tradable on a national securities market or exchange,
     through a "cashless broker exercise" program approved in advance by the
     Company, (c) any other method approved by the Company, including, with the
     consent of the Committee, by withholding a number of Shares that would
     otherwise be delivered on exercise of the Option that have an aggregate
     Fair Market Value that does not exceed the aggregate exercise price for the
     Options being then exercised, or (d) any combination of the foregoing. No
     fraction of a Share shall be transferred upon exercise of the Options.
     Unless and until a certificate or certificates representing such Shares
     shall have been transferred by the Company to you, you (or the person
     permitted to exercise the Options in the event of your death) shall not be
     or have any of the rights or privileges of a shareholder of the Company
     with respect to Shares acquirable upon an exercise of the Options.

6.   Withholding of Tax. To the extent that the exercise of an Option results
     in the receipt of compensation by you with respect to which the Company or
     a Subsidiary has a tax withholding obligation pursuant to applicable law,
     unless other arrangements have been made by you that are acceptable to the
     Company or such Subsidiary, you shall either deliver to the Company or the
     Subsidiary such amount of money as the Company or the Subsidiary may
     require to meet its withholding obligations under such applicable law or
     have the Company withhold a number of Shares that would otherwise be
     delivered on exercise or vesting that have an aggregate Fair Market Value
     that does not exceed the amount of taxes to be withheld; provided, however,
     that if you fail to satisfy the Company's or the Subsidiary's tax
     withholding obligations, the Company, in its sole discretion, may withhold
     a number of Shares that would otherwise be delivered on exercise or vesting
     that have an aggregate Fair Market Value equal to the amount of taxes
     required to be withheld. No delivery of Shares shall be made pursuant to
     the exercise of an Option under this Agreement until you have paid or made
     arrangements approved by the Company or the Subsidiary to satisfy in full
     the applicable tax withholding requirements of the Company or Subsidiary.

     Restrictions. By accepting this grant, you agree that the Shares which you
     may acquire by exercising the Options will not be sold or otherwise
     disposed of in any manner which would constitute a violation of any
     applicable federal or state securities laws. You also agree that (i) the
     book entry made (or the certificates, if any are issued) representing the
     Shares purchased under the Options may bear such restriction, restrictions,
     legend or legends as the Committee deems appropriate in order to assure
     compliance with applicable securities laws, (ii) the Company may refuse to
     register the transfer of the Shares purchased under the Options on the
     transfer records of the Company if such proposed transfer would in the
     opinion of counsel satisfactory to the Company constitute

                                      -4-
<PAGE>
     a violation of any applicable securities law, and (iii) the Company may
     give related instructions to its transfer agent, if any, to stop
     registration of the transfer of the Shares purchased under the Options.

8.   Limitations Upon Transfer. All rights under this Agreement shall belong to
     you alone and may not be transferred, assigned, pledged, or hypothecated by
     you in any way (whether by operation of law or otherwise), other than by
     will or the laws of descent and distribution and shall not be subject to
     execution, attachment, or similar process. Upon any attempt by you to
     transfer, assign, pledge, hypothecate, or otherwise dispose of such rights
     contrary to the provisions in this Agreement or the Plan, or upon the levy
     of any attachment or similar process upon such rights, such rights shall
     immediately become null and void.

9.   Binding Effect. This Agreement shall be binding upon and inure to the
     benefit of any successors to the Company and all persons lawfully claiming
     under you.

10.  Entire Agreement. This Agreement, the Plan, and the Employment Agreement
     constitute the entire agreement of the parties with regard to the subject
     matter hereof and thereof, and contain all the covenants, promises,
     representations, warranties and agreements between the parties with respect
     to the Option granted hereby. Without limiting the scope of the preceding
     sentence, all prior understanding and agreements, if any, among the parties
     hereto relating to the subject matter hereof and thereof are hereby null
     and void and of no further force and effect.

11.  Modifications. Except as provided below, any modification of this Agreement
     shall be effective only if it is in writing and signed by both you and an
     authorized officer of the Company. Notwithstanding anything in the Plan or
     this Agreement to the contrary, if the Committee determines that the terms
     of this grant do not, in whole or in part, satisfy the requirements of new
     Section 409A of the Internal Revenue Code, the Committee, in its sole
     discretion, may unilaterally modify this Agreement in such manner as it
     deems appropriate to comply with such section and any regulations or
     guidance issued thereunder.

12.  Governing Law. This Agreement shall be governed by, and construed in
     accordance with, the laws of the State of Texas, without regard to
     conflicts of laws principles thereof.

     IN WITNESS WHEREOF, the Company has caused this Agreement to be executed
by its duly authorized officer all effective as of the day and year first above
written.

                                   MARINER ENERGY, INC.

                                   By:
                                      ---------------------------------------
                                      Scott D. Josey
                                      Chief Executive Officer and President

                                  -5-

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