Exhibit
      10.13 Addendum to Employment Agreement of Harry Briers





EXECUTIVE
      VICE PRESIDENT SEPARATION AND SEVERANCE AGREEMENT





THIS
      SEPARATION AND SEVERANCE AGREEMENT (the "Severance Agreement") is made a part
      of
      that Employment Agreement (the "Employment Agreement"), entered into and
      effective as of the 9 th day of
      October, 2006, by and between HARRY JAMES BRIERS, an individual resident of
      the
      State of Texas ("Executive"), and HYPERDYNAMICS CORPORATION, a Delaware
      corporation (the "Company").





W
      I T N E
      S S E T H:





WHEREAS,
      the Company desires to employ Executive and to provide for severance benefits
      under the terms and conditions set forth herein; and





WHEREAS,
      this Severance Agreement constitutes part of the Employment Agreement and is
      incorporated therein by reference and fully set forth therein.





COVENANTS





NOW,
      THEREFORE, in consideration of the premises, mutual promises contained herein,
      and other valuable consideration, the receipt and sufficiency of which are
      hereby acknowledged, the parties agree as follows:





1.Certain
      Definitions. The following terms shall have the meanings set forth
      herein.




(a)
            "Administrator"
                shall mean the Company. The Company shall also be the "named fiduciary"
                hereunder. The Company shall have the authority to designate one
                or more
                of its officers, employees or directors to act on its behalf in
                administering this Severance
                Agreement.





(b)
            "Base
                Salary" shall mean Executive's regular pay at the time of termination.
                Base Salary shall not include bonus or incentive plans, overtime
                pay,
                relocation allowances or the value of any other benefits for which
                Executive may be eligible.





(c)
            "Good
                Reason" shall mean, without the express written consent of Executive,
                the
                occurrence of any of the following events unless such events are
                fully
                corrected within 30 days following written notification by Executive
                to
                the Company that he intends to terminate his employment hereunder
                for one
                of the reasons set forth below:





(i)
      a
      material breach by the Company of any provision of this Agreement, including,
      but not limited to, the assignment to Executive of any duties inconsistent
      with
      Executive's position in the Company or a material adverse alteration in the
      nature or status of Executive's responsibilities;


(ii)
      the
      Company's requiring the Executive to be based anywhere other than the
      metropolitan area where he currently works and resides; and


(iii)
      the
      occurrence of a "Change in Control" as defined below.





For
      purposes of this Agreement a "Change in Control" shall mean an event as a result
      of which: (i) any "person" (as such term is used in Sections 13(d) and 14(d)
      of
      the Securities Exchange Act of 1934 (the "Exchange Act")), is or becomes the
      "beneficial owner" (as defined in Rule 13d-3 under the Exchange Act, except
      that
      a person shall be deemed to have "beneficial ownership" of all securities that
      such person has the right to acquire, whether such right is exercisable
      immediately or only after the passage of time), directly or indirectly, of
      more
      than 50% of the total voting power of the voting stock of the Company; (ii)
      the
      Company consolidates with, or merges with or into another corporation or sells,
      assigns, conveys, transfers, leases or otherwise disposes of all or
      substantially all of its assets to any person, or any corporation consolidates
      with, or merges with or into, the Company, in any such event pursuant to a
      transaction in which the outstanding voting stock of the Company is changed
      into
      or exchanged for cash, securities or other property, other than any such
      transaction where (A) the outstanding voting stock of the Company is changed
      into or exchanged for (i) voting stock of the surviving or transferee
      corporation or (ii) cash, securities (whether or not including voting stock)
      or
      other property, and (B) the holders of the voting stock of the Company
      immediately prior to such transaction own, directly or indirectly, not less
      than
      50% of the voting power of the voting stock of the surviving corporation
      immediately after such transaction; or (iii) during any period of two
      consecutive years, individuals who at the beginning of such period constituted
      the Board of the Company (together with any new directors whose election by
      such
      Board or whose nomination for election by the stockholders of the Company was
      approved by a vote of 66-2/3% of the directors then still in office who were
      either directors at the beginning of such period or whose election or nomination
      for election was previously so approved) cease for any reason to constitute
      a
      majority of the Board of the Company then in office; or (iv) the Company is
      liquidated or dissolved or adopts a plan of liquidation, provided, however,
      that
      a Change in Control shall not include any going private or leveraged buy-out
      transaction which is sponsored by Executive or in which Executive acquires
      an
      equity interest materially in excess of his equity interest in the Company
      immediately prior to such transaction (each of the events described in (i),
      (ii), (iii) or (iv) above, except as provided otherwise by the preceding clause
      being referred to herein as a "Change in Control"). In the event of a sale
      of
      the assets or stock of the Company, the Executive shall have the option of
      electing to terminate his employment due to a Change in Control and receive
      such
      severance benefits or electing to remain employed under the terms of this
      Agreement, but not both. Executive's right to terminate his employment for
      Good
      Cause due to any "Change in Control" must be exercised within sixty (60) days
      after receiving written notice or his receiving actual knowledge of such Good
      Cause.


(d)
      Cause
      shall mean:


(i)
      fraud, misappropriation, embezzlement, or other act of material misconduct
      against the Company or any of its affiliates;


(ii)
      substantial and willful failure to perform specific and lawful directives of
      the
      Board;


(iii)
      willful and knowing violation of any rules or regulations
      of any governmental or regulatory body, which is materially
      injurious to the financial condition of the Company; or


(iv)
      conviction of or plea of guilty or nolo contendere to a
      felony;


(v)
      a
      material breach of the terms and conditions of this Agreement: provided,
      however, that with regard to subparagraphs (ii) and (v) above, Executive may
      not
      be terminated for Cause unless and until the Board has given him reasonable
      written notice of its intended actions and specifically describing the alleged
      events, activities or omissions giving rise thereto and with respect to those
      events, activities or omissions for which a cure is possible, a reasonable
      opportunity to cure such breach; and provided further, however, that for
      purposes of determining whether any such Cause is present, no act or failure
      to
      act by Executive
      shall be considered "willful" if done or omitted to be done by Executive in
      good
      faith and in the reasonable belief that such act or omission was in the best
      interest of the Company and/or required by applicable law.





(e)
      Disability shall mean that as a result of Executive's incapacity due to physical
      or mental illness (as determined in good faith by a physician acceptable to
      the
      Company and Executive), Executive shall have been absent from the full-time
      performance of his duties with the Company for 120 consecutive days during
      any
      twelve (12) month period or if a physician acceptable to the Company and
      Executive advises the Company that it is likely that Executive will be unable
      to
      return to the full-time performance of his duties for 120 consecutive days
      during the succeeding twelve (12) month period.





2.
      Responsibility for Benefits. The Company will pay the entire cost of all
      benefits provided under this Severance Agreement, solely from its general
      assets. The benefits made available by this Severance Agreement are "unfunded,"
      and Executive is not required or permitted to make any contribution with respect
      to this Severance Agreement.










3.
      Payment of Benefits. In the event Executive's employment is terminated (a)
      by
      the Company other than for Cause, Disability or Death or (b) by Executive for
      Good Reason (as defined herein), Executive shall receive the following severance
      benefits upon his satisfaction of the condition in paragraph 4 hereof:





His
      Base
      Salary during the period commencing on the effective date of such termination
      and ending one (1) year later (the "Salary Continuation Period"), as if
      Executive were still employed during the Salary Continuation Period; and








4.
      Conditions to Receipt of Benefits. Upon the occurrence of an event described
      in Section 3 above, Executive will be eligible for severance benefits to begin
      immediately.





5.
      Termination Events Not Covered. Notwithstanding anything to the contrary
      contained herein, the Company shall not pay Executive severance benefits under
      this Severance Agreement if:





(a)
      Executive terminates his employment with Company for a reason other than Good
      Reason as defined herein; or





(b)
      Executive revokes his agreement to release the Company from any and all claims
      related to his employment pursuant to the Settlement Agreement and Release
      executed.





6.
      How
      Severance Benefits Are Paid. The Company will pay severance benefits in
      installments through the Company's regular payroll procedure according to
      Executive's pay schedule at the time of termination of employment; provided
      however, the Administrator shall have the discretion to cause the Company to
      pay
      all severance benefits in a lump sum payment. Executive's severance benefits
      shall be subject to mandatory withholding, including federal, state and local
      income taxes, as well as FICA and withholding.




7.
      Additional Information Regarding this Severance Agreement.





(a)
      This
      Severance Agreement shall not be amended except by a written agreement executed
      by Executive and by an authorized officer of the Company (other than
      Executive).





(b)
      The
      Employment Agreement and this Severance Agreement provides the sole and
      exclusive agreement concerning severance benefits for Executive in the event
      of
      a termination and replaces any and all prior plans, policies and practices
      relating to severance pay that may exist now or may have existed in the
      past.





(c)
      To
      the extent not preempted by ERISA, the Employment Agreement and this Severance
      Agreement shall be governed by and construed according to the laws of the state
      of Texas.





(d)
      If a
      provision of this Severance Agreement shall be held illegal or invalid, the
      legality or invalidity shall not affect the remaining provisions of this
      Severance Agreement, and this Severance Agreement shall be construed and
      enforced as if the illegal or invalid provision had not been
      included.




(e)
      Executive acknowledges that no representation, promise or inducement has been
      made other than as set forth in the Employment Agreement and this Severance
      Agreement, and that he does not enter into this Employment Agreement and
      Severance Agreement in reliance upon any representation, promise or inducement
      not set forth herein and the Employment Agreement. The Employment Agreement
      and
      this Severance Agreement supersedes all prior negotiations and understandings
      of
      any kind with respect to the subject matter and contains all of the terms and
      provisions of the agreement between Executive and the Company with respect
      to
      the subject matter hereof. Any representation, promise or condition, whether
      written or oral, not specifically incorporated herein, shall be of no binding
      effect.





Agent
                For Service of Legal Process:HYPERDYNAMICS
                CORPORATIONAttention:
                Secretary








IN
      WITNESS WHEREOF, the parties hereto have executed this Severance Agreement
      as of the date first set forth above.





EXECUTIVE:
            
            COMPANY:By:
                /s/ Kent P. Watts
            
            By:
                /s/ Harry J. BriersEXECUTIVE
            
            HYPERDYNAMICS
                CORPORATIONHarry
                J. Briers
            
            Kent
                P. WattsExecutive
                Vice President
            
            Chief
                Executive Officer