<PAGE>


                                                                    EXHIBIT 10.2


PNG-1

     NEITHER THIS NOTE NOR THE SHARES OF COMMON STOCK ISSUABLE ON REDEMPTION OF
THIS NOTE (THE "SHARES") HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "SECURITIES ACT"), OR THE SECURITIES LAWS OF ANY STATE. THE
HOLDER HEREOF, BY PURCHASING THIS NOTE, AGREES FOR THE BENEFIT OF THE COMPANY
THAT THIS NOTE AND THE SHARES MAY NOT BE RESOLD, PLEDGED OR OTHERWISE
TRANSFERRED OR DISPOSED OF UNLESS THE NOTE OR THE SHARES AS THE CASE MAY BE, HAS
BEEN REGISTERED UNDER THE SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES OR
BLUE SKY LAWS OR EXEMPTIONS FROM THE REGISTRATION REQUIREMENTS OF SUCH LAWS ARE
AVAILABLE.

     IF THE HOLDER OF THIS NOTE WAS AN AFFILIATE OF THE COMPANY AT ANY TIME
DURING THE THREE MONTHS PRECEDING THE DATE OF ANY SUCH TRANSFER, THE FOREGOING
CONDITIONS MUST BE COMPLIED WITH REGARDLESS OF WHEN SUCH TRANSFER IS MADE.

     ANY UNITED STATES PERSON WHO HOLDS THIS OBLIGATION WILL BE SUBJECT TO
LIMITATIONS UNDER THE U.S. INCOME TAX LAWS, INCLUDING THE LIMITATIONS PROVIDED
IN SECTIONS 165(j) AND 1287(a) OF THE UNITED STATES INTERNAL REVENUE CODE OF
1986, AS AMENDED.

     THIS OBLIGATION IS NOT A DEPOSIT AND IS NOT INSURED BY ANY AGENCY OF THE
UNITED STATES GOVERNMENT.

                            HARKEN ENERGY CORPORATION
                      PROMISSORY NOTE DUE 1 SEPTEMBER, 2003

     Harken Energy Corporation, a Delaware corporation (hereinafter, the
"Company," which term includes any successor to the Company), for value
received, hereby promises to pay to Waverley Investments Limited, upon
presentation and surrender of this Note (the "Note") the principal sum of ONE
MILLION SEVEN HUNDRED AND FIVE THOUSAND DOLLARS (U.S. $1,705,000) (the
"Principal Amount") on September 1, 2003 without interest.

     Upon failure of the Company to make any payment of principal on the date
when due and payable, the outstanding principal balance of the Note will bear
interest at the Default Rate beginning on the date such payment was due until
the default is cured.

     Payments of default interest on this Note shall be paid by the Company on
the last Business Day of each calendar month to a bank account nominated in
writing by the registered holder of such Note as shown in the Note Register at
the close of business on the applicable Record Date.

     Notwithstanding any other provision of the Note to the contrary, in no
event shall the default interest contracted for, charged or received in
connection with the Note (including any other costs or considerations that
constitute default interest under applicable law which are contracted for,
charged or received pursuant to the Note) exceed the maximum rate of nonusurious
interest allowed under applicable

<PAGE>


law as presently in effect and to the extent an increase is allowable by such
laws, but in no event shall any amount ever be paid or payable greater than the
amount contracted for in the Note, and all amounts paid by the Company which
constitute usurious interest under the applicable law shall be applied in the
manner described herein.

     The principal on this Note shall be paid to a bank account nominated in
writing by the registered holder of this Note as shown on the Note Register at
the close of business on the applicable Record Date.

     This Note has been issued pursuant to resolutions adopted by the Board of
Directors of the Company by unanimous written consent effective 3 March 2003.

     This Note and the Terms and Conditions shall be governed by and construed
in accordance with the laws of the State of New York.


IN WITNESS WHEREOF, the Company has caused this Note to be duly executed in its
corporate name by the manual or facsimile signatures of the undersigned duly
authorized officers of the Company.

Dated as of  March 18, 2003.

                                            HARKEN ENERGY CORPORATION


                                            By: /s/ Bruce N. Huff
                                               ------------------------------
                                                Bruce N. Huff, President and
                                                Chief Operating Officer



[Corporate Seal]


ATTEST:

By: /s/  A. Wayne Hennecke
   --------------------------------
    A. Wayne Hennecke,
    Senior Vice President-Finance
    and Secretary


                                                                               2

<PAGE>



                        TERMS AND CONDITIONS OF THE NOTE

     The U.S. $1,705,000 Promissory Note Due 1 September 2003 (the "Note" or
"Notes") of Harken Energy Corporation, a Delaware corporation (the "Company") is
constituted by, and authorized to be issued pursuant to these Terms and
Conditions and resolutions of the Board of Directors of the Company by unanimous
written consent effective on 3 March 2003.

     Certain terms not otherwise defined in the text hereof are defined in
Condition 19 herein.

1. Form, Denominations, and Title, and Certain Administrative Provisions

     (A) The Note is issued in registered certified form in denominations of
U.S. $1,000 or multiples thereof (the "Authorized Denomination") and with such
numerical and other identification designation as the Company shall deem
desirable.

     (B) Title to the Note will pass by form of transfer as set out in Schedule
B and reregistration of new ownership in the Note Register. The Company may (to
the fullest extent permitted by applicable laws) deem and treat the registered
Holder of the Note as the absolute owner thereof for all purposes (whether or
not the Note shall be overdue and notwithstanding any notice to the contrary).

     (C) The Note shall be executed on behalf of the Company by its President
and Chief Operating Officer under its corporate seal or a facsimile of such seal
reproduced thereon and attested by its Senior Vice President-Finance and
Secretary or an Assistant Secretary. The signature of any of these officers on
the Note may be manual or facsimile signatures of the present or any future such
authorized officer and may be imprinted or otherwise reproduced on the Note.

     The Note bearing the manual or facsimile signatures of individuals who were
at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the delivery of the Notes or did not hold such offices at the
date of the Note.

     Upon surrender for transfer or exchange of the Note to an office of the
Note Registrar designated by the Company for that purpose, the Company shall
execute and deliver in the name of the transferee or transferees a new Note or
Notes of the same series and interest rate and in Authorised Denominations, and
for the aggregate principal amount the owner is entitled to receive. No transfer
of the Note shall be binding upon the Company, unless made at such office and
shown on the Note Register. The Bank of New York will initially serve as the
Note Registrar.

     In case the Company, pursuant to Conditions 3(B) and 3(C), shall be
consolidated or merged with or into any other Person or shall convey, transfer,
lease or otherwise dispose of its Properties and assets substantially as an
entirety to any Person, and the successor Person resulting from such
consolidation, or surviving such merger, or into which the Company shall have
been merged, or the Person which shall have received a conveyance, transfer,
lease or other disposition as aforesaid, shall have entered into an amendment
hereto, the Note may, from time to time, at the request of the successor Person,
be exchanged for another Note executed in the name of the successor Person with
such changes in phraseology and form as may be appropriate, but otherwise in
substance of like tenor as the Note surrendered for such exchange and of like
principal amount.

     (D) Except as otherwise provided herein, no service charge shall be made
for any exchange or redemption of Notes, but the Company may require payment of
a sum sufficient to cover any tax or other governmental charge that may be
imposed in connection with any exchange of Notes.

     (E) (1) The Holder of this Note may grant proxies and otherwise authorize
any person to take any action which a Noteholder is entitled to take under these
Terms and Conditions.


                                                                               3

<PAGE>


     (2) Nothing contained herein shall be deemed to authorize any transfers of
this Note otherwise than in accordance with the Securities Act. Unless otherwise
required by applicable law, the Company shall not recognize or give effect to
any attempt to transfer any Note or any interest therein in violation of the
Securities Act.

     (F) The Noteholder by acceptance of the Note hereby covenants and agrees
that neither the Note nor the Redemption Shares will be offered, sold,
transferred, pledged, converted or otherwise disposed of unless the Note and/ or
the Redemption Shares have been registered under the Securities Act or any
applicable state securities or blue sky laws or exemptions from the registration
requirements of such laws are available.

     (G) If (i) any mutilated Note is surrendered to the Company or the Note
Registrar, or (ii) the Company or the Note Registrar, as the case may be,
receives evidence to its satisfaction of the destruction, loss or theft of any
Note, and there is delivered to the Company and the Note Registrar such security
and/or indemnity as may be required by them to save them harmless, then, in the
absence of notice to the Company or the Note Registrar that such Note has been
acquired by a bona fide purchaser, the Company shall execute and deliver, in
exchange for any such mutilated Note or in lieu of any such destroyed, lost or
stolen Note, a new Note of like tenor and principal amount, bearing a number not
contemporaneously Outstanding.

     In case any such mutilated, destroyed, lost or stolen Note has become or is
about to become due and payable, the Company in its discretion may, instead of
issuing a new Note, pay such Note, as the case may be.

     Upon the issuance of any new Note under this Condition, the Company may
require the payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses connected
therewith.

     Every new Note issued pursuant to this Condition in lieu of any destroyed,
lost or stolen Note shall constitute an original additional contractual
obligation of the Company, whether or not the destroyed, lost or stolen Note
shall be at any time enforceable by anyone, and shall be entitled to all
benefits hereunder equally and proportionately with any and all other Notes duly
issued hereunder.

     The provisions of this Condition are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of a mutilated, destroyed, lost or stolen Note.

     (H) The Company shall maintain an office or agency where the Note may be
presented for registration of transfer or for exchange ("Registrar") and an
office or agency where Notes may be presented for payment ("Paying Agent" or
"paying agent"). The Registrar shall keep a register of the Note and of its
transfer and exchange. The Company may appoint one or more co-registrars and one
or more additional paying agents. The term "Registrar" includes any co-registrar
and the term "Paying Agent" or "paying agent" includes any additional paying
agent. The Company may change any paying agent or Registrar without notice to
any Holder. The Company shall notify the Noteholder in writing of the name and
address of the Registrar or any paying agent, if the Company is not serving as
such. The Company or any of its Subsidiaries may act as paying agent or
Registrar. The Bank of New York will initially act as Registrar and paying
agent.

2. Status

     The Note is a direct, unconditional and unsecured obligation of the
Company. The Note will rank senior to all Subordinated Obligations of the
Company, present and future, but, in the event of bankruptcy or insolvency of
the Company, only to the extent permitted by the applicable laws relating to
creditors' rights. The Notes will not be secured by any assets or property of
the Company. The Note will rank pari passu with all other present and future
Indebtedness of the Company (including the Company's 5.0% Senior Convertible
Notes due 2003) other than Subordinated Obligations.


                                                                               4

<PAGE>


3. Covenants

     (A) The Company will do or cause to be done all things necessary to
preserve and keep in full force and effect its corporate existence, rights
(charter and statutory) and franchises of the Company; provided, however, that
the Company shall not be required to preserve any such right or franchise if the
Board of Directors shall determine that the preservation thereof is no longer in
the best interests of the Company and the conduct of its business, and that the
loss thereof is not disadvantageous in any material respect to the Noteholders;
and provided, further, that nothing contained in this Condition 3(A) shall
prohibit any transaction permitted by Condition 3(B) or Condition 3(C) herein.

     (B) The Company will not merge or consolidate with or sell, convey,
transfer or lease or otherwise dispose of all, or substantially all of its
Properties and assets substantially as an entirety to any Person, unless: (a)
either (i) the Company shall be the surviving Person or (ii) the Person (if
other than the Company) formed by such consolidation or into which the Company
is merged or the Person which acquired by conveyance or transfer, or which
leases, the Properties and assets of the Company substantially as an entirety
(1) shall be a Person organized and validly existing under the laws of the
United States of America, any state thereof or the District of Columbia and (2)
shall expressly assume, by a written instrument, the Company's obligation for
the due and punctual payment of the principal of and interest on the Note and
the performance and observance of every Term and Condition contained herein.

     (C) Upon any consolidation of the Company with or merger of the Company
with or into any other Person or any conveyance, transfer or lease of the
Properties and assets of the Company substantially as an entirety to any person,
the successor Person formed by such consolidation or into which the Company is
merged or to which such conveyance, transfer or lease is made shall succeed to,
and be substituted for, and may exercise every right and power of, the Company
under the Terms and Conditions contained herein with the same effect as if such
successor Person had been named as the Company herein, and in the event of any
such conveyance or transfer, the Company, except in the case of a lease, shall
be discharged of all obligations and covenants under the Note and may be
dissolved and liquidated.

     (D) The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (a) all taxes, assessments and
governmental charges levied or imposed upon the Company or upon the income,
profits or Property of the Company and (b) all lawful claims for labour,
materials and supplies which, if unpaid, might by law become a Lien upon the
Property of the Company; provided, however, that the Company shall not be
required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge or claim whose amount, applicability or validity is being
contested in good faith by appropriate proceedings.

     (E) The Company will not amend its Certificate of Incorporation or Bylaws
except as required by law, except in respect to such amendments that the Board
of Directors reasonably determines do not materially adversely affect the rights
of the Noteholder, or except to the extent that such amendment would not have a
material adverse effect on (a) the ability of the Company to perform its
obligations under the Note or (b) the rights of the Noteholder, except that
neither (i) increases in the number of Shares and issuance thereof with related
securities, nor (ii) designations of Preferred Stock of the Company,
modifications of the terms of such designations and issuance thereof with
related securities, nor (iii) modification or expansion of the indemnity
provisions provided by the Company to its directors and officers, nor (iv)
change of the Company's registered agent shall be deemed an amendment hereunder.

     (F) To the extent permitted by law, the Company will provide to the
Noteholder such statements, certificates or other documentation concerning the
organization or operations of the Company as may be reasonably necessary to
establish any exceptions or exemptions from United States federal income tax
withholding and reporting requirements.



                                                                               5

<PAGE>


     (G) The Company shall file a registration statement on Form S-3 (or such
other form as the Company may determine is appropriate or required under the
rules of the Commission), within ninety (90) days following the issue of any
Redemption Shares in respect of all Shares that may be issuable at any time upon
the redemption of the Note. The Company shall use its best efforts to cause the
Commission to declare such registration statement (and any necessary amendments
thereto) effective. The Company shall also use its best efforts to maintain the
effectiveness of such registration statement, and to refile such a registration
statement from time to time in the event its effectiveness lapses, until all
such Shares that either are issued or that may be issued are Freely Tradable in
the United States once the registration statement has been declared effective.

     The Company will use its best efforts to list and maintain a listing of all
Shares issued upon redemption of the Note on a Stock Exchange. In the event a
Stock Exchange requires stockholder approval in order to complete the listing of
the Shares to be so issued upon redemption of the Note, then the Company will
use its best efforts to obtain such stockholder approval at the earliest
possible stockholder meeting. In this event, the redemption in Shares will occur
only if and when stockholder approval has been obtained. If the Company is
unable to obtain or maintain such listing of Shares, it will forthwith give not
less than 30 calendar days notice to the Noteholder of the listing, de-listing
or quotation or lack of quotation of the Shares (as a class) by any such Stock
Exchange.

     (H) If the Company shall at any time act as its own paying agent, it will,
on or before the due date of the principal on any of the Notes, segregate and
hold in trust for the benefit of the Persons entitled thereto a sum sufficient
to pay the principal so becoming due until such sums shall be paid to such
Persons or otherwise disposed of as herein provided.

4. Interest

     The Note does not bear interest other than default interest at the Default
Rate.

     Any money held by the Company in trust for the payment of the principal of
or default interest on the Note and remaining unclaimed for two years after such
principal or default interest has become due and payable shall be discharged
from such trust; and the Holder of the Note shall thereafter, as an unsecured
general creditor, look only to the Company for payment thereof, and all
liability of the Company with respect to such trust money, and all liability of
the Company as trustee thereof, shall thereupon cease.

     Default interest is calculated on the basis of a 360 day year consisting of
12 months of 30 days each and, in the case of an incomplete month, the number of
days elapsed.

5. Payments

     Payments of default interest on the Note shall be paid by the Company or
its paying agent on the last Business Day of each calendar month, commencing
October 31, 2003, to the Holder of such Note as shown on the Note Register at
the close of business on the Special Record Date, such payment to be made as
provided in the next paragraph.

     Payments of principal in respect of the Note will only be made, against
presentation and surrender of the certificate for the Note at the specified
office of the Company or its paying agent. All payments of principal and default
interest shall be made in U.S. dollars. Each such payment will be made at the
specified office of the Company or its paying agent, at the option of the
Holder, by U.S. dollar cheque mailed to an address, or, with respect to a Holder
of at least $1,000,000 in principal amount of Notes, delivered in accordance
with the Holder's instructions, or by transfer to a U.S. dollar account
maintained by the Holder in accordance with the holder's instructions, subject
in all cases to any applicable fiscal or other laws and regulations, but without
prejudice to the provisions of Condition 9, provided that the final payment of
principal shall be made upon presentation of the Notes at the office of the
Company or the specified office of the Paying Agent.



                                                                               6

<PAGE>

     If, at any time, in the opinion of the Company or of the paying agent,
payments in U.S. dollars cannot be so made, payments will be made in U.S.
dollars in such other manner as may be approved by the Company and the paying
agent and notice of the alternative manner of payment will be given to the
Noteholder in accordance with Condition 15.

     All monies paid by the Company to a paying agent for the payment of
principal or default interest on any Note which remain unclaimed at the end of
two (2) years after the principal on such Note will have become due and payable
will be repaid to the Company and the Holder of such Note will thereafter have
only the rights of a creditor of the Company as described in these Terms and
Conditions or such rights as may be otherwise provided by applicable law.

     A Holder shall be entitled to present a Note for payment only on a
Presentation Date and shall not be entitled to any further payment if a
Presentation Date is after the due date.

     When making payments to Noteholders, fractions of one cent will be rounded
down to the nearest whole cent.

6. Conversion

     A Noteholder does not have any right to convert the Note into any
securities of the Company.

7. Redemption and Purchase

     (A) Unless previously redeemed or purchased and canceled as provided
herein, the Company will redeem the Note at its principal amount on 1 September,
2003.

     (B) (i) The Company may, at its option and after having given not less than
30 nor more than 60 calendar days' notice to the Noteholder(s) in accordance
with Condition 15 (which notice shall be irrevocable), redeem the Note(s) for
cash, in whole or in part, at a Redemption Price equal to 100 per cent of their
principal amount together with default interest (if any) accrued to (but
excluding) the Redemption Date. If the Company elects to redeem less than all
the Notes, Company or its paying agent will select which Notes to redeem by lot,
random, or such other method as it shall deem fair and appropriate. Upon expiry
of any such notice period as is referred to in this Condition 7(B) (and subject
as provided above), the Company shall be bound to redeem Notes at their
principal amount, together with default interest accrued to but excluding the
Redemption Date.

     (ii) Provided that the Shares which may be issued pursuant to this
paragraph shall be Freely Tradeable and listed on a Stock Exchange following the
registration statement referred to in Condition 3(G) being declared effective,
on 1 September 2003, the Company may redeem upon not less than 30 nor more than
60 days notice, pursuant and subject the Conditions listed above, up to 100% of
the Outstanding Notes for Shares. If the Company elects to redeem all or part of
the Notes for Shares, each Note will be redeemed for the number of shares of
Common Stock equal to the sum of the face value of the Note redeemed divided by
the average of the Market Price of the Shares over all the Stock Exchange
Business Days during August 2003. If the Company elects to redeem less than all
the Notes, the Company will select which Notes to redeem by lot, random, or such
other method as it shall deem fair and appropriate. Upon expiry of any such
notice period as is referred to in this Condition 7(B) (and subject as provided
above), the Company shall be bound to redeem Notes as described above.

     (C) Subject to applicable law, the Company or any of its Subsidiaries may
at any time purchase Notes in any manner and at any price in the open market or
by private treaty. If purchases are made by tender, tenders must be available to
all Noteholders alike. Notes purchased by the Company or any of its Subsidiaries
will forthwith be surrendered for cancellation and shall no longer be deemed
Outstanding.



                                                                               7

<PAGE>

     (D) All Notes which are redeemed by the Company will forthwith be canceled
and may not be reissued or resold.

8. Taxation

     All payments in respect of the Notes by the Company shall be made without
withholding or deduction for, or on account of, any present or future taxes,
duties, assessments or governmental charges of whatever nature ("Taxes") imposed
or levied by or on behalf of the U.S. or any political sub-division of, or any
authority in, or of, the U.S. having power to tax, unless the withholding or
deduction of the Taxes is required by law. In that event, the Company will pay
such additional amounts as may be necessary in order that the net amounts
received by the Noteholders after the withholding or deduction shall equal the
respective amounts which would have been receivable in respect of the Notes in
the absence of the withholding or deduction; except that no additional amounts
shall be payable in relation to any payment in respect of any Note:

     (A) to, or to a third party on behalf of, a Holder who is liable for the
Taxes in respect of the Note by reason of such Holder having some connection
with the U.S. other than the mere holding of the Note; and

     (B) presented for payment more than 30 calendar days after the Relevant
Date except to the extent that a Holder would have been entitled to additional
amounts on presenting the same for payment on the last day of such period of 30
calendar days; or

     (C) to, or to a third party on behalf of, a Holder who would not be liable
or subject to the withholding or deduction by making a declaration of
non-residence or other similar claim for exemption to the relevant tax
authority.

     Any reference in these Terms and Conditions to any amounts in respect of
the Notes shall be deemed also to refer to any additional amounts which may be
payable under this Condition.

9. Additional Covenants

     During the term of the Note, the Company will, save with the approval of an
Extraordinary Resolution:

     (1) at all times after ninety (90) days from the date of the initial
issuance of the Notes keep available for issuance free from any preemptive
rights out of its authorized but unissued capital such number of Shares as would
enable the rights of redemption into Shares to be satisfied in full;

     (2) maintain a listing for all the issued Shares and all Shares to be
issued on the exercise of any redemption rights on a Stock Exchange, it being
understood that if the Company is unable to obtain or maintain such listing of
Shares and will forthwith give notice to the Noteholders in accordance with
Condition 15 of the listing, de-listing or quotation or lack of quotation of the
Shares (as a class) by any such Stock Exchange; and

     (3) not in any way modify the rights attaching to the Shares with respect
to voting, dividends or liquidation.

10. Prescription

     Notes will become void unless presented for payment within periods of ten
(10) years (in the case of principal) and five (5) years (in the case of default
interest) from the Relevant Date in respect of the Notes, as the case may be,
subject to the provisions of Condition 5.

11. Events of Default and Enforcement

     (A) Event of Default



                                                                               8

<PAGE>

     "Event of Default," wherever used in these Terms and Conditions, means any
one of the following events (whatever the reason for such Event of Default,
whether voluntary or involuntary or effected by operation of law or pursuant to
any judgment, decree or order of any court or any order, rule or regulation of
any administrative or governmental body) which shall have occurred and is
continuing:

          (1) if default is made for a period of five (5) Business Days or more
     in the payment of principal due in respect of the Notes or any of them; or

          (2) if the Company fails to perform or observe any of its other
     obligations, covenants, conditions or provisions under the Notes, these
     Terms and Conditions, the Company's 5.0% Senior Notes due 2003, or the
     trust indenture pursuant to which such 5.0% Senior Notes due 2003 were
     issued, and such failure continues for the period of 30 calendar days (or
     such longer period as the Majority Holders may in their absolute discretion
     permit) next following the service by the one or more of the Holders on the
     Company of notice requiring the same to be remedied; or

          (3) if (i) any other Indebtedness of the Company becomes due and
     payable prior to its Stated Maturity by reason of an event of default
     (howsoever defined) or (ii) any such Indebtedness of the Company is not
     paid when due or, as the case may be, within any applicable grace period or
     (iii) the Company fails to pay when due (or, as the case may be, within any
     applicable grace period) any amount payable by it under any present or
     future guarantee for, or indemnity in respect of, any Indebtedness of any
     Person or (iv) any security given by the Company or any subsidiary for any
     Indebtedness of any Person or any guarantee or indemnity of Indebtedness of
     any Person by the Company becomes enforceable by reason of default in
     relation thereto and steps are taken to enforce such security save in any
     such case where there is a bona fide dispute as to whether the relevant
     Indebtedness or any such guarantee or indemnity as aforesaid shall be due
     and payable (following any applicable grace period); provided, however,
     that in each such case the Indebtedness exceeds in the aggregate U.S.
     $2,000,000 and in each such case such event continues unremedied for a
     period of 30 calendar days (or such longer period as the Majority Holders
     may in their sole discretion consent to in writing upon receipt of written
     notice from the Company); or

          (4) if the Company shall generally fail to pay its debts as such debts
     come due (except debts which the Company may contest in good faith
     generally) or shall be declared or adjudicated by a competent court to be
     insolvent or bankrupt, shall consent to the entry of an order of relief
     against it in an involuntary bankruptcy case, shall enter into any
     assignment or other similar arrangement for the benefit of its creditors or
     shall consent to the appointment of a custodian (including, without
     limitation, a receiver, liquidator or Company); or

          (5) if a receiver, administrative receiver, administrator or other
     similar official shall be appointed in relation to the Company or in
     relation to the whole or a substantial part its undertaking or assets or a
     distress, execution or other process shall be levied or enforced upon or
     sued out against, or an encumbrancer shall take possession of, the whole or
     a substantial part of the assets of any of them and in any of the foregoing
     cases is not paid out or discharged within 90 calendar days (or such longer
     period as the Majority Holders may in their absolute discretion consent to
     in writing upon receipt of written notice from the Company); or

          (6) if the Company institutes proceedings to be adjudicated a
     voluntary bankrupt, or shall consent to the filing of a bankruptcy
     proceeding against it, or shall file a petition or answer or consent
     seeking organization under the laws of the Federal Bankruptcy Code or any
     similar applicable U.S. federal, state or foreign law, or shall consent to
     the filing of any such petition, or shall consent to the appointment of a
     receiver or liquidator or trustee or assignee (or other similar official)
     in bankruptcy or insolvency of it or its Property, or shall make an
     assignment for the benefit of creditors, or shall admit in writing its
     inability to pay its debts generally as they come due; or

          (7) if a decree or order by a court having jurisdiction in the
     premises shall have been entered adjudging the Company a bankrupt or
     insolvent, or approving as properly filed a petition seeking the
     reorganization of the Company under the Federal Bankruptcy Code or any
     other similar applicable U.S. federal, state or foreign


                                                                               9

<PAGE>

     law, and such decree or order shall have continued undischarged or unstayed
     for a period of 90 calendar days; or a decree or order of a court having
     jurisdiction in the premises for the appointment of a receiver or
     liquidator or trustee or assignee (or other similar official) in bankruptcy
     or insolvency of the Company or of all or substantially all of its
     Property, or for the winding up or liquidation of its affairs, shall have
     been entered, and such decree or order shall have continued undischarged
     and unstayed for a period of 90 calendar days; or

          (8) if a warranty, representation, or other statement made by or on
     behalf of the Company contained herein or any certificate or other
     agreement furnished in compliance herewith is false in any material respect
     when made and such falsity continues for a period of 30 calendar days (or
     such longer period as the Majority Holders may in their absolute discretion
     permit) next following the service by one or more of the Holders on the
     Company of notice requiring the same to be remedied; or

          (9) if there is any final judgment or judgments for the payment of
     money exceeding in the aggregate U.S. $2,000,000 outstanding against the
     Company which has been outstanding for more than 60 calendar days from the
     date of its entry and shall not have otherwise been discharged in full or
     stayed by appeal, bond or otherwise.

     (B) Acceleration of Maturity; Rescission and Annulment

     If an Event of Default (other than an Event of Default specified in
Condition 11(A)(6) or 11(A)(7)) occurs and is continuing, then and in every such
case the Majority Holders may declare the principal amount of all the Notes to
be due and payable immediately, by a notice in writing to the Company, and upon
any such declaration such principal amount shall become immediately due and
payable.

     If an Event of Default specified in Condition 11(A)(6) or Condition
11(A)(7) occurs and is continuing, then the principal amount of all the Notes
shall ipso facto become and be immediately due and payable without any
declaration or other act on the part of any Noteholder.

     At any time after a declaration of acceleration has been made and before a
judgment or decree for payment of the money due has been obtained by the
Majority Holders as hereinafter in this Condition provided, the Majority
Holders, with written notice to the Company, may rescind and annul such
declaration and its consequences if

          (1) the Company has paid or deposited in a manner satisfactory to such
     Holders a sum sufficient to pay

               (i) all unpaid principal of any Outstanding Notes which has
          become due otherwise than by such declaration of acceleration, and

               (ii) all reasonable sums paid or advanced by the such Holders
          hereunder; and

          (2) all Events of Default, other than the non-payment of amounts of
     principal on Notes which have become due solely by such declaration of
     acceleration, have been cured or waived as provided in Condition 11(K)

     No such rescission shall affect any subsequent default or impair any right
consequent thereon.

     (C) Collection of Indebtedness and Suits for Enforcement by the Majority
Holders

     The Company covenants that if default is made in the payment of the
principal of any Note at the Maturity thereof and such default continues for a
period of five (5) Business Days, the Company will, upon demand of the


                                                                              10

<PAGE>


Majority Holders, pay to the Holders of the Notes, the whole amount then due and
payable on the Notes for principal and default interest on any overdue principal
and, to the extent that payment of such interest shall be legally enforceable,
upon any overdue installment of interest, at the rate prescribed therefor in the
Notes, and, in addition thereto, such further amount as shall be sufficient to
cover the costs and expenses of collection, including the reasonable expenses,
disbursements and advances of the Holders, their agents and counsel, and the
reasonable compensation of such agents and counsel.

     If the Company fails to pay such amounts forthwith upon such demand, the
Majority Holders in their name, may institute a judicial proceeding for the
collection of the sums so due and unpaid, may prosecute such proceeding to
judgment or final decree and may enforce the same against the Company or any
other obligor upon the Notes and collect the moneys adjudged or decreed to be
payable in the manner provided by law out of the Property of the Company or any
other obligor upon the Notes, wherever situated.

     If an Event of Default occurs and is continuing, the Majority Holders may
in their discretion proceed to protect and enforce their rights and the rights
of the other Noteholders by such appropriate judicial proceedings as such
Holders shall deem most effectual to protect and enforce any such rights,
whether for the specific enforcement of any covenant or agreement in these terms
and conditions or to enforce any other proper remedy.

     (D) Majority Holders May File Proofs of Claim

     In case of the pendency of any receivership, insolvency, liquidation,
bankruptcy, reorganization, arrangement, adjustment, composition or other
judicial proceeding relative to the Company or any other obligor upon the Notes
or the Property of the Company or of such other obligor or their creditors, the
Majority Holders (irrespective of whether the principal of the Notes shall then
be due and payable as therein expressed or by declaration or otherwise and
irrespective of whether the Majority Holders shall have made any demand on the
Company for the payment of overdue principal or interest) shall be entitled and
empowered, by intervention in such proceeding or otherwise,

     (1) to file and prove a claim for the whole amount of principal and default
interest owing and unpaid in respect of the Notes and to file such other papers
or documents as may be necessary or advisable in order to have the claims of the
Holders (including any claim for the reasonable expenses, disbursements and
advances of such Holders, their agents and counsel) and of the other Noteholders
allowed in such judicial proceeding, and the reasonable compensation of such
agents and counsel, and

     (2) to collect and receive any moneys or other Property payable or
deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
similar official in any such judicial proceeding is hereby authorized by each
Noteholder to make such payments to the Majority Holders due them for the
reasonable expenses, disbursements and advances of such Holders, their agents
and counsel and the reasonable compensation of such agents and counsel, and to
pay to the Paying Agent (where one is appointed) all such other sums due under
the Notes. In the absence of such appointment, any such sums shall be paid for
the rateable benefit of all the Noteholders.

     Nothing herein contained shall be deemed to authorize the Majority Holders,
except as permitted by law and these Terms and Conditions, to authorize or
consent to or accept or adopt on behalf of any Noteholder any plan of
reorganization, arrangement, adjustment or composition affecting the Notes or
the rights of any Noteholder thereof, or to authorize the such Holder to vote in
respect of the claim of any Noteholder in any such proceeding, except to the
extent permitted by law.



                                                                              11

<PAGE>


     (E) Majority Holders May Enforce Claims Without Possession of Notes

     All rights of action and claims under these Terms and Conditions may be
prosecuted and enforced by the Majority Holders without the possession of any of
the Notes or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Majority Holders shall be brought in their own
name and any recovery of judgment shall, after provision for the payment of the
reasonable compensation, expenses, disbursements and advances of the Majority
Holders, their agents and counsel, be paid to the Paying Agent (where one is
appointed) for the rateable benefit of all the Noteholders in respect of which
such judgment has been recovered.

     (F) Application of Money Collected

     Any money collected by the Majority Holder pursuant to this Condition shall
be applied in the following order in case of the distribution of such money on
account of principal or interest, upon presentation of the Notes and the
notation thereon of the payment if only partially paid and upon surrender
thereof if fully paid:

          FIRST: To the payment of the amounts then due and unpaid for principal
     of and default interest on the Notes in respect of which or for the benefit
     of which such money has been collected, ratably, without preference or
     priority of any kind, according to the amounts due and payable on such
     Notes for principal and default interest, respectively; and

          SECOND: The balance, if any, to the Person or Persons entitled
     thereto.

     (G) Unconditional Right of Holders to Receive Principal and Default
Interest

     Notwithstanding any other provision in these Terms and Conditions, the
Holder of any Note shall have the right, which is absolute and unconditional, to
receive payment, as provided herein and in such Note of the principal of and
default interest on, such Note on the respective Stated Maturity or expressed in
such Note (or, in the case of redemption, on the Redemption Date) and to
institute suit for the enforcement of any such payment, and such rights shall
not be impaired without the consent of such Holder; provided, that all monies
paid by the Company to the Paying Agent (if appointed) for the payment of
principal or default interest on any Note which remain unclaimed at the end of
two (2) years after the Stated Maturity or Redemption Date of such Note will be
repaid to the Company and the Holder of any Note shall thereafter have only the
rights of a creditor of the Company or such rights as may be otherwise provided
by applicable law.

     (H) Restoration of Rights and Remedies

     If the Majority Holders or any Noteholder has instituted any proceeding to
enforce any right or remedy under these Terms and Conditions and such proceeding
has been discontinued or abandoned for any reason, or has been determined
adversely to the Majority Holders or to such Noteholder, then and in every such
case, subject to any determination in such proceeding, the Company, the Majority
Holders and the Noteholders shall be restored severally and respectively to
their former positions hereunder and thereafter all rights and remedies of the
Majority Holders and the Noteholders shall continue as though no such proceeding
had been instituted.

     (I) Rights and Remedies Cumulative



                                                                              12

<PAGE>

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Notes as provided herein, no right or
remedy herein conferred upon or reserved to the Noteholders is intended to be
exclusive of any other right or remedy, and every right and remedy shall, to the
extent permitted by law, be cumulative and in addition to every other right and
remedy given hereunder or now or hereafter existing at law or in equity or
otherwise. The assertion or employment of any right or remedy hereunder, or
otherwise, shall not prevent the concurrent assertion or employment of any other
appropriate right or remedy.

     (J) Delay or Omission Not Waiver

     No delay or omission of the Majority Holders or Holder of any Note to
exercise any right or remedy accruing upon any Event of Default shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein. Every right and remedy given by this Article or by law to
the Noteholders may be exercised from time to time, and as often as may be
deemed expedient, by the Noteholders.

     (K) Waiver of Past Defaults

     Subject to Condition 11(B), the Majority Holders may on behalf of the
Holders of all the Notes waive any past default hereunder and its consequences,
except a default

          (1) in respect of the payment of the principal of or default interest
     on any Note, or

          (2) in respect of a covenant or provision hereof which under Condition
     17 cannot be modified or amended without the consent of the Holder of each
     Outstanding Note affected.

     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of these Terms and Conditions; but no such waiver shall extend to any subsequent
or other default or Event of Default or impair any right consequent thereon.

     (L) Waiver of Stay or Extension Laws

     The Company covenants (to the extent that it may lawfully do so) that it
will not at any time insist upon, or plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the
performance of these Terms and Conditions; and the Company (to the extent that
it may lawfully do so) hereby expressly waives all benefit or advantage of any
such law.

     (M) Requirements Regarding Agents (if appointed)

          (1) At any time after an Event of Default has occurred and is
     continuing the Majority Holders shall notify in writing the Company and the
     Paying Agent (if appointed), and may by notice in writing to the Company
     and the Paying Agent (if appointed):

               (i) require the Paying Agent, until notified to the contrary by
          Majority Holders, to hold all Notes and all moneys, documents and
          records held by it in respect of Notes to the order of the Holders; or

               (ii) require the Paying Agent to deliver to the Holders on a pro
          rata basis all funds held by it for the benefit of the Holders, and to
          deliver the documents and records held by it in respect of Notes to
          the Holders, provided that such notice shall be deemed not to apply to
          any documents or records which the relevant Paying Agent is obliged to
          release by any law or regulation; and


                                                                              13

<PAGE>


               (iii) require the Company to make all subsequent payments in
          respect of the Notes to or to the order of the Holders and not to the
          Paying Agent.

          (2) The Majority Holders shall notify the Paying Agent immediately
     upon the cure or waiver of an Event of Default. Upon receipt of such
     notice, the provisions of this Condition 11(M) shall no longer apply.

          (3) Prior to taking any action under this Agreement at the direction
     of any Person with respect to the Notes, the Paying Agent shall be entitled
     to receive (and shall receive) indemnity or security satisfactory to it.

12. Liability Solely Corporate

     No recourse shall be had for the payment of the principal of or default
interest on any Notes or any part thereof, or for any claim based thereon or
otherwise in respect thereof, or of the indebtedness represented thereby, or
upon any obligation, covenant or agreement in these Terms and Conditions,
against any incorporator, or against any stockholder, officer or director, as
such, past, present or future, of the Company, or of any predecessor or
successor Person, either directly or through the Company or any such predecessor
or successor Person, whether by virtue of any constitution, statute or rule of
law, or by the enforcement of any assessment or penalty or otherwise, it being
expressly agreed and understood that the Notes and these Terms and Conditions
which are a part thereof are solely corporate obligations, and that no personal
liability whatsoever shall attach to, or be insured by, any such incorporator,
stockholder, officer or director, as such, past, present or future, of the
Company or of any predecessor or successor Person, either directly or through
the Company or any such predecessor or successor Person, because of the
indebtedness hereby authorized or under or by reason of any of the obligations,
covenants, promises or agreements contained in the Notes or the these Terms and
Conditions which constitute a part thereof or to be implied herefrom; and that
any such personal liability is hereby expressly waived and released as a
condition of, and as part of the consideration for the exchange transaction
pursuant to which the Notes were issued; provided, however, that nothing herein
contained shall be taken to prevent recourse to and the enforcement of the
liability, if any, of any stockholder or subscriber to capital stock of the
Company upon or in respect of shares of capital stock not fully paid up.

13. Defeasance and Covenant Defeasance

     (A) Company's Option to Effect Defeasance or Covenant Defeasance

     The Company may, at its option by Board Resolution, at any time, with
respect to the Notes, elect to have either Condition 13(B) or Condition 13(C)
applied to all Outstanding Notes upon compliance with the conditions set forth
below in this Condition, The Company shall promptly give notice of such election
to the Holders.

     (B) Legal Defeasance and Discharge

     Upon the Company's exercise under Condition 13(A) of the option applicable
to this Condition 13(B), the Company shall be deemed to have been discharged
from its obligations with respect to all Outstanding Notes on the date the
conditions set forth in Condition 13(D) are satisfied (hereinafter, "legal
defeasance"). For this purpose, such legal defeasance means that the Company
shall be deemed to have paid and discharged the entire indebtedness represented
by the Outstanding Notes, which shall thereafter be deemed to be "Outstanding"
only for the purposes of Condition 13(E) and the other Conditions of these Terms
and Conditions referred to in (1) and (2) below, and to have satisfied all its
obligations under such Notes, including the obligation to pay default interest
on the Notes, and these Terms and Conditions insofar as such Notes are concerned
(and the Holders, at the expense of the Company, shall execute proper
instruments acknowledging the same), except for the following which shall
survive until otherwise terminated or discharged hereunder: (1) the rights of
Holders of Outstanding Notes to receive, solely from the trust fund described in
Condition 13(D) and as more fully set forth in such Condition, payments in
respect of the principal of and default interest on such Notes when such
payments are due, and (B) the Company's obligations with respect to the Notes
under Conditions 1(D), 1(E), 1(H), 3(D) or 3(L). Subject to compliance with this
Condition, the


                                                                              14

<PAGE>

Company may exercise its option under this Condition 13(B) notwithstanding the
prior exercise of its option under Condition 13(C) with respect to the Notes.

     (C) Covenant Defeasance

     Upon the Company's exercise under Condition 13(A) of the option applicable
to this Condition 13(C), the Company shall be released from its obligations
under any covenant contained in Condition 3 (except Condition 3(D) with respect
to the Outstanding Notes on and after the date the conditions set forth in
Condition 13(D)) are satisfied (hereinafter, "covenant defeasance"), and the
Notes shall thereafter be deemed not to be "Outstanding" for the purposes of any
request, demand, authorization, direction, declaration, notice, consent, waiver
or Act of Noteholders (and the consequences of any thereof) in connection with
such covenants, but shall continue to be deemed "Outstanding" for all other
purposes hereunder. For this purpose, such covenant defeasance means that, with
respect to the Outstanding Notes, the Company may omit to comply with and shall
have no liability in respect of any term, condition or limitation set forth in
any such covenant, whether directly or indirectly, by reason of any reference
elsewhere herein to any such covenant or by reason of any reference in any such
covenant to any other provision herein or in any other document and such
omission to comply shall not constitute a Default or an Event of Default under
Condition 11(A)(4), but, except as specified above, the remainder of these and
the Notes shall be unaffected thereby.

     (D) Conditions to Legal Defeasance or Covenant Defeasance

     The following shall be the conditions to application of either Condition
13(B) or Condition 13 (C) to the Outstanding Notes:

          (1) The Company shall irrevocably have deposited or caused to be
     deposited with a paying agent as trust funds in trust for the purpose of
     making the following payments, specifically pledged as security for, and
     dedicated solely to, the benefit of the Holders of such Notes, (A) money in
     an amount, or (B) U.S. Government Obligations which through the scheduled
     payment of principal in respect thereof in accordance with their terms will
     provide, not later than one day before the due date of any payment, money
     in an amount, or (C) a combination thereof, sufficient, in the opinion of a
     nationally recognized firm of independent public accountants expressed in a
     written certification thereof delivered to the paying agent, to pay and
     discharge, and which shall be applied by the paying agent to pay and
     discharge, the principal of the Outstanding Notes on the Stated Maturity
     (or Redemption Date, if applicable) of such principal; provided that the
     paying agent shall have been irrevocably instructed to apply such money or
     the proceeds of such U.S. Government Obligations to said payments with
     respect to the Notes; and provided further that, upon the effectiveness of
     this Condition 13(D), the money or U.S. Government Obligations deposited
     shall not be subject to the rights of the Noteholders pursuant to the
     provisions of this Condition. Before or after such a deposit, the Company
     may give to the paying agent a notice of its election to redeem all of the
     Outstanding Notes at a future date in accordance with Condition 7, which
     notice shall be irrevocable. Such irrevocable redemption notice, if given,
     shall be given effect in applying the foregoing.

          (2) No Default or Event of Default with respect to the Notes shall
     have occurred and be continuing on the date of such deposit or, insofar as
     paragraphs (6) and (7) of Condition 11(A) hereof are concerned, at any time
     during the period ending on the 91st day after the date of such deposit (it
     being understood that this condition shall not be deemed satisfied until
     the expiration of such period).

          (3) No event or condition shall exist that pursuant to the provisions
     of Condition 13(B) or 13(C) would prevent the Company from making payments
     of the principal of the Notes on the date of such deposit or at any time
     during the period ending on the 91st day after the date of such deposit (it
     being understood that this condition shall not be deemed satisfied until
     the expiration of such period).


                                                                              15

<PAGE>

          (4) Such legal defeasance or covenant defeasance shall not result in a
     breach or violation of, or constitute a default under any material
     agreement or material instrument to which the Company is a party or by
     which it is bound.

          (5) In the case of an election under Condition 13(B), the Company
     shall have delivered to the paying agent an Opinion of Counsel stating that
     the Holders of the Outstanding Notes will not recognize income, gain or
     loss for U.S. federal income tax purposes as a result of such defeasance
     and will be subject to federal income tax on the same amounts, in the same
     manner and at the same times as would have been the case if such defeasance
     had not occurred.

          (f) The Company shall have delivered to the paying agent an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent provided for relating to either the legal defeasance under
     Condition 13(B) or the covenant defeasance under Condition 13(C) (as the
     case may be) have been complied with.

     (E) Deposited Money and U.S. Government Obligations to Be Held in Trust;
Other Miscellaneous Provisions

     Subject to the provisions of the disposition of unclaimed moneys contained
herein, all money and U.S. Government Obligations (including the proceeds
thereof) deposited with the paying agent pursuant to Condition 13(D) in respect
of the Outstanding Notes shall be held in trust and applied by the paying agent,
in accordance with the provisions of these terms and conditions, to the payment,
either directly or through the paying agent (including the Company acting as its
own paying agent) to the Holders of the Notes of all sums due and to become due
thereon in respect of principal, but such money and U.S. Government Obligations
need not be segregated from other funds except to the extent required by law.

     (F) Reinstatement

     If the paying agent is unable to apply any money or U.S. Government
Obligations in accordance with Condition 13(E) by reason of any order or
judgment of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, then the Company's obligations under
these Terms and Condition shall be revived and reinstated as though no deposit
had occurred pursuant to Condition 13(B) or 13(C), as the case may be, until
such time as the paying agent is permitted to apply all such money or U.S.
Government Obligations in accordance with Condition 13(E); provided, however,
that no action taken in good faith by the Company after a deposit of money or
U.S. Government Obligations or both pursuant to Condition 13(E) and prior to the
revival and reinstatement of obligations under these Terms and Conditions
pursuant to this Condition 13(F) shall constitute the basis for the assertion of
an Event of Default pursuant to Condition 11; and provided, further, that if the
Company makes any payment of principal of or default interest on any Note
following the reinstatement of its obligations, the Company shall be subrogated
to the rights of the Holders of such Notes to receive such payment from the
money or U.S. Government Obligations held the Paying Agent.

14. Replacement of Notes

     As provided in Conditions 1(H), should any Note be lost, stolen, mutilated,
defaced or destroyed, it may be replaced at the specified office of the paying
agent or Company upon payment by the claimant of the expenses incurred in
connection with the replacement and on such terms as to evidence indemnity and
security as the Company and the Paying Agent may reasonably require. Mutilated
or defaced Notes must be surrendered before replacements will be issued.



                                                                              16

<PAGE>

15. Notices

     (A) Notices to all the Noteholders will be valid if posted by ordinary mail
to the address of the Noteholder on the Note Register (unless another form of
notice is permitted by these Terms and Conditions) with a written copy provided
to RP&C International, Limited. Any notice shall be deemed to have been given on
the date which is 5 Business Days after the date of posting. If posting of
notice as provided above is not practicable, notice will be given in such other
manner, and shall be deemed to have been given on such date, as the Company may
reasonably approve.

     (B) Any request, demand, authorization, direction, declaration, notice,
consent, waiver, Extraordinary Resolution or Act of Noteholders or other
document provided or pertained by these Terms and Conditions (herein
collectively called "Notice") to be made upon, given or furnished to, or filed
with the Company by any Noteholder shall be sufficient for every purpose
hereunder (unless otherwise herein expressly provided) if made, given, furnished
or filed in writing to or with the Company addressed to it at the address of its
principal office which shall initially be: Harken Energy Corporation, 580
WestLake Park Boulevard, Suite 600, Houston, Texas 77079, Attention: Mikel D.
Faulkner, Chairman of the Board and Chief Executive Officer Tel. (281) 504-4000,
Fax, (281) 504-4100; with a copy to A. Wayne Hennecke, Senior Vice
President-Finance and Secretary: Tel. (281) 504-4040, Fax. (281) 504-4110.

16. Acts of Noteholders, Meetings of Noteholders

     (A) Any Extraordinary Resolution, request, demand, authorization,
direction, declaration, notice, consent, waiver or other action provided by
these Terms and Conditions to be given or taken by Noteholders may be embodied
in and evidenced by one or more instruments of substantially similar tenor
signed by such Noteholders in person or by agents duly appointed in writing;
and, except as herein otherwise expressly provided, such action shall become
effective when such instrument or instruments are delivered to the Company. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Noteholders
signing such instrument or instruments. Proof of execution of any such
instrument or of a writing appointing any such agent shall be sufficient for any
purpose of these Terms and Conditions and conclusive in favor of the Company, if
made in the manner provided in this Condition.

     (B) The fact and date of the execution by any Person of any such instrument
or writing may be proved by the affidavit of a witness of such execution or by a
certificate of a notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to such witness, notary public or other such officer the
execution thereof. Where such execution is by a signer acting in a capacity
other than such signer's individual capacity, such certificate or affidavit
shall also constitute sufficient proof of authority. The fact and date of the
execution of any such instrument or writing, or the authority of the Person
executing the same, may also be proved in any other manner which the Company
deems sufficient.

     (C) Any Extraordinary Resolution, request, demand, authorization,
direction, notice, consent, waiver or other Act of the Holders of any Note shall
bind every future Holder of the same Note and the Holder of every Note issued
upon redemption thereof or in exchange therefor or in lieu thereof in respect of
anything done, omitted or suffered to be done the Company or any paying agent in
reliance thereon, whether or not notation of such action is made upon such Note.

     (D) The Noteholders may convene a meeting at any time and from time to time
to consider any matter affecting the Holders of the Notes, including the
modification of the Terms and Conditions and to make, give or take any request,
demand, authorization, direction, notice, consent, waiver or other action
provided by this these Terms and Conditions to be made, given or taken by
Holders of the Notes.


                                                                              17

<PAGE>


     (E) Notice of every meeting of the Holders of the Notes, setting forth the
time and the place of such meeting and in general terms the action proposed to
be taken at such meeting, shall be given in the manner provided in Condition 15,
not less than 21 nor more than 180 days prior to the date fixed for the meeting.

     (F) To be entitled to vote at any meeting of Holders of the Notes, a Person
shall be (i) a Holder of one or more Outstanding Notes, or (ii) a Person
appointed by an instrument in writing as proxy for a Holder or Holders of one or
more Outstanding Notes by such Holder or Holders. The only Persons who shall be
entitled to be present or to speak at any meeting of Noteholders shall be the
Persons entitled to vote at such meeting and their counsel, any representatives
of the Company, and their respective counsel.

     (G) The quorum at any meeting for passing any Extraordinary Resolution will
be one or more Persons present holding or representing 50% or more in principal
amount of the Outstanding Notes as of the date of the meeting, or at any
adjourned such meeting one or more Persons present whatever the principal amount
of the Notes held or represented by such Person and the vote required for
passing an Extraordinary Resolution at such meeting will be not less than a
majority of the principal amount of the Outstanding Notes and represented at
such meeting or adjournment thereof; provided, that at any meeting, the business
of which includes the modification of the provisions of the Terms and Conditions
and the provisions of these Terms and Conditions, the necessary quorum and vote
required for passing an Extraordinary Resolution will be one or more Persons
present holding or representing not less than a majority, or at any adjourned
such meeting not less than one-third, of the principal amount of the Outstanding
Notes. An Extraordinary Resolution passed at any meeting of the Holders of the
Notes will be binding on all Holders of the Notes, whether or not such
Noteholders are present at the meeting.

17. Amendments to Terms and Conditions

     (A) Amendments with Consent of Noteholders

     With the consent of the Holders of a majority in principal amount of the
Notes Outstanding, the Company, when authorized by a Board Resolution, may amend
these Terms and Conditions for the purpose of adding any provisions to or
changing in any manner or eliminating any of the provisions hereof or of
modifying in any manner the rights of the Noteholders hereunder; provided,
however, that no such amendment shall, without the consent of the Holder of each
Outstanding Note affected thereby:

          (1) change the Stated Maturity of the principal of any Note, or reduce
     the principal amount thereof or the rate of default interest thereon, or
     change the coin or currency in which any Note or the default interest
     thereon is payable, or impair the right to institute suit for the
     enforcement of any such payment after the Stated Maturity thereof (or, in
     the case of redemption, on or after the Redemption Date), or

          (2) reduce the percentage in principal amount of the Outstanding
     Notes, the consent of whose Holders is required for any amendment of these
     terms and conditions, or the consent of whose Holders is required for any
     waiver of compliance with certain provisions of these Terms and Conditions
     or certain defaults hereunder and their consequences provided for herein,
     or

          (3) modify any of the provisions of Condition 11(K), except to
     increase any such percentage or to provide that certain other provisions of
     these Terms and Conditions be modified or waived without the consent of the
     Holder of each Outstanding Note affected thereby,

          (4) modify any of the provisions of these Terms and Conditions
     relating to the subordination of the Notes in a manner adverse to the
     Holders thereof, or

          (5) modify any of the provisions of these Terms and Conditions
     relating to redemption rights.


                                                                              18

<PAGE>


     It shall not be necessary for any Act of Noteholders under this Condition
to approve the particular form of any proposed amendment to the Terms and
Conditions, but it shall be sufficient if such Act shall approve the substance
thereof.

     (B) Effect of Amendments

     Upon the entering into of an amendment of these Terms and Conditions
pursuant to the terms hereof, these Terms and Conditions shall be modified in
accordance therewith, and amendment shall form a part of these Terms and
Conditions for all purposes; and every Holder of Notes theretofore or thereafter
delivered hereunder shall be bound thereby.

18. Governing Law

     The Notes, including these Terms and Conditions, are governed by, and will
be construed in accordance with, the laws of the State of New York.

19. Definitions of Certain Terms

     "Act," when used with respect to any Noteholder, has the meaning specified
in Condition 16.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person and the terms "controlling" and "controlled"
have meanings correlative to the foregoing.

     "Authorized Denomination" means U.S. $1,000.

     "Board of Directors" means either the board of directors of the Company or
any duly authorized committee of that board.

     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
which is a day on which banking institutions in the City of New York, New York,
and London, England are not authorized or obliged by law, regulation or
executive order to close.

     "Capitalized Lease Obligation" means the amount of the liability under any
capital lease that, in accordance with GAAP, is required to be capitalized and
reflected as a liability on the balance sheet of the relevant Person.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted or, if at any time after the Issue Date such Commission is not
existing, then the body performing similar duties at such time.

     "Common Stock" means, with respect to any Person, any and all shares,
interests, participation and other equivalents (however designated, whether
voting or non-voting) of such Person's common stock, whether now outstanding or
issued after the Issue Date, and includes, without limitation, all series and
classes of such common stock.

     "Company" means Harken Energy Corporation, until a successor Person shall
have become such pursuant to the applicable provisions of these Terms and
Conditions, and thereafter "Company" shall mean such successor Person.


                                                                              19

<PAGE>

     "Corporation" includes corporations, limited liability companies, limited
and general partnerships, associations, joint-stock companies and business
trusts.

     "Default Rate" means, with respect to the Notes, ten percent (10%) per
annum.

     "Effective Date" means the first Business Day following the date upon which
the Commission declares to be effective a registration statement filed by the
Company pursuant to the Securities Act relating to the Redemption Shares.

     "Extraordinary Resolution" means a resolution passed at a meeting of the
Noteholders duly convened and held in these Terms and Conditions.

     "Federal Bankruptcy Code" means the Bankruptcy Act or Title 11 of the
United States Code, as amended from time to time.

     "Freely Tradable" means, with respect to the Notes and the Redemption
Shares, that under the Securities Act the holders thereof may then offer and
sell any amount of such outstanding securities to the public in the United
States without restrictions in transactions that are not brokers' transactions
(as defined in the Securities Act) either (i) pursuant to an effective
registration statement then in effect or (ii) pursuant to Rule 144(k). For
purposes of determining whether such securities are Freely Tradable, it shall be
assumed that no person that directly, or indirectly through one or more
intermediaries, controls, or is controlled by, or is under common control with,
the Company has ever held such securities from and after their issuance.

     "Generally Accepted Accounting Principles" or "GAAP" means generally
accepted accounting principles in the United States, as applied from time to
time by the Company and its Subsidiaries in the preparation of its financial
statements.

     "Guaranty" means all obligations of any Person (other than endorsements in
the ordinary course of business of negotiable instruments for deposit or
collection) of such Person guaranteeing or in effect guaranteeing any
Indebtedness, dividend or other obligation, of any other Person (the "primary
obligor") in any manner, whether directly or indirectly, including without
limitation all obligations incurred through an agreement, contingent or
otherwise, by such Person: (i) to purchase such Indebtedness or obligation or
any Property or assets constituting security therefor, or (ii) to advance or
supply funds (1) for the purchase or payment of such Indebtedness or obligation,
or (2) to enable the recipient of such funds to maintain certain financial
conditions (e.g. agreed amount of working capital) under loan or similar
documents, or (iii) to lease Property or to purchase securities or other
Property or services primarily for the purpose of assuring the owner of such
Indebtedness or obligation of the ability of the primary obligor to make payment
of the Indebtedness or obligation, or (iv) otherwise to assure the owner of the
Indebtedness or obligation of the primary obligor against loss in respect
thereof. For the purposes of all computations made under these Terms and
Conditions, a Guaranty in respect of any Indebtedness shall be deemed to be
Indebtedness equal to the principal amount and accrued interest of such
Indebtedness which has been guaranteed, and a Guaranty in respect of any other
obligation or liability or any dividend shall be deemed to be Indebtedness equal
to the maximum aggregate amount of such obligation, liability or dividend.

     "Holder or Noteholder" means a Person in whose name a Note is registered in
the Note Register.

     "Indebtedness" of any Person means and includes all present and future
obligations of such Person, which shall include all obligations (i) which in
accordance with generally accepted accounting principles in the United States
shall be classified upon a balance sheet of such Person as liabilities of such
Person, (ii) for borrowed money, (iii) which have been incurred in connection
with the


                                                                              20

<PAGE>

acquisition of Property (including, without limitation, all obligations of such
Person evidenced by any debenture, bond, note, commercial paper or other similar
security, but excluding, in any case, obligations arising from the endorsement
in the ordinary course of business of negotiable instruments for deposit or
collection), (iv) secured by any Lien existing on Property owned by such Person,
even though such Person has not assumed or become liable for the payment of such
obligations, (v) created or arising under any conditional sale or other title
retention agreement with respect to Property acquired by such Person,
notwithstanding the fact that the rights and remedies of the seller, lender or
lessor under such agreement in the event of default are limited to repossession
or sale of such Property, (vi) which are Capitalized Lease Obligations, (vii)
for all Guaranties, whether or not reflected in the balance sheet of such Person
and (viii) which are all reimbursement and other payment obligations (whether
contingent, matured or otherwise) of such Person in respect of any acceptance or
documentary credit. Notwithstanding the foregoing, Indebtedness shall not
include (i) Indebtedness incidental to the operation of the business of the
Person in the ordinary course and in the aggregate not material to the business
and operations of the Person, (ii) Indebtedness for which the Company or any of
its Subsidiaries are the sole obligors and obligees, and (iii) Indebtedness
represented by purchase, rental or lease obligations not to exceed $1,000,000 in
any period of 12 months for any Person and its Subsidiaries.

     "Issue Date" means the date of the initial issuance of the Note.

     "Lien" means any mortgage, charge, pledge, lien, security interest or
encumbrance of any kind whatsoever, including any interest in Property securing
an obligation owed to, or a claim by, a Person other than the owner of the
Property, whether such interest is based on the common law, statute or contract,
and including but not limited to the security interest lien arising from a
mortgage, encumbrance, pledge, conditional sale or trust receipt or a lease,
consignment or bailment for security purposes. The term "Lien" shall include
reservations, exceptions, encroachments, easements, rights-of-way, covenants,
conditions, restrictions, leases and other title exceptions and encumbrances
affecting Property. For the purposes of these Terms and Conditions, the Company
or its Subsidiary shall be deemed to be the owner of any Property which it has
acquired or holds subject to a conditional sale agreement, financing lease or
other arrangement pursuant to which title to the Property has been retained by
or vested in some other Person for security purposes.

     "Majority Holders" means the Holders of a majority of the principal amount
of Notes Outstanding.

     "Market Price" means the daily closing sale price of the Shares for a Stock
Exchange Business Day on a Stock Exchange. If the Common Stock is not quoted on
any Stock Exchange, then the Market Price shall be for any particular day shall
be calculated promptly at the Company's expense by a reputable investment bank
selected by the Company.

     "Maturity," when used with respect to any Note, means the date on which the
principal of such Note becomes due and payable as therein or herein provided,
whether at the Stated Maturity or the Redemption Date and whether by declaration
of acceleration, call for redemption or otherwise.

     "Note Register" means the register maintained by the Company for the
registration and transfer of the Note.

     "Note Registrar" means the registrar appointed by the Company from time to
time to act as Note Registrar.

     "Outstanding," when used with respect to Notes, means, as of the date of
determination, all Notes theretofore issued, except: (1) Notes heretofore
cancelled by the paying agent or delivered to the paying agent or Company for
cancellation; (2) Notes, or portions thereof, for whose payment or redemption
money in the necessary amount has been theretofore deposited any paying agent
(other than the Company) in trust or set aside and segregated in trust by the
Company (if the Company shall act as its own paying agent) for the Holders of
such Notes; provided that, if such Notes are to be redeemed, notice of such
redemption has been duly given or provision therefor satisfactory to the paying
agent (if appointed) has been made; (3) Notes, except to the extent provided in
Conditions 13 (B) and 13(C), with respect to which the Company has effected
defeasance and/or covenant defeasance as provided in Condition 13; and (4) Notes
which have been paid pursuant to or in



                                                                              21

<PAGE>

exchange for or in lieu of which other Notes have been issued, however, that in
determining whether the Holders of the requisite principal amount of Outstanding
Notes have taken any Act or given or made any Extraordinary Resolution, Notes
owned by the Company or any other obligor upon the Notes or any Affiliate of the
Company (other than Persons whose Affiliate relationship arises solely from
ownership of Shares) or such other obligor shall be disregarded and deemed not
to be Outstanding.

     "Paying Agent" or "paying agent" means any Person (including the Company
acting as paying agent) authorized by the Company to pay the principal of or
default interest on any Notes on behalf of the Company. Pursuant to the terms
and conditions hereof, the Company has initially appointed The Bank of New York
as the paying agent.

     "Person" means any individual, corporation, limited liability company,
limited or general partnership, joint venture, association, joint-stock company,
trust, unincorporated organization or government or any agency or political
subdivision thereof.

     "Preferred Stock" means, with respect to any Person, any and all shares,
interests, participation or other equivalents (however designated) of such
Person's preferred or preference stock whether now outstanding or issued on or
after the Issue Date, and includes, without limitation, all classes and series
of preferred or preference stock.

     "Presentation Date" means the date on which a Note is presented by a
Noteholder for payment of principal or if such date is not a Business Day in
London and New York, the next date which is a Business Day in each of the
foregoing cities.

     "Property" or "Properties" means any kind of property or asset, whether
real, personal or mixed, or tangible or intangible, and any interest therein.

     "Redemption Date," when used with respect to any Note to be redeemed, in
whole or in part, means the date fixed for such redemption by or pursuant to
these Terms and Conditions.

     "Redemption Price," when used with respect to any Note to be redeemed,
means the price at which it is to be redeemed pursuant to the terms hereof,
expressed in a number of Redemption Shares into which such Note shall be
redeemed in the event the Notes are to be redeemed for Shares and, in the event
of any other redemption, a cash amount.

     "Redemption Shares" means the Shares into which the Notes are redeemable by
the Company pursuant to Condition 7.

     "Relevant Date" means the date on which the payment first becomes due;
provided, that if the full amount of the money payable has not been received by
the Paying Agent on or before the due date, it shall mean the date on which, the
full amount of the money having been so received, notice to that effect shall
have been duly given to the Noteholders by the Company in accordance with
Condition 15.

     "Rule 144A" means Rule 144A, as amended, promulgated by the Commission
pursuant to the Securities Act.

     "Rule 144" means Rule 144, as amended, promulgated by the Commission
pursuant to the Securities Act.

     "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated from time to time by the Commission pursuant
thereto.


                                                                              22

<PAGE>


     "Shares" means the common stock, par value U.S. $0.01, of the Company (and
all other (if any) shares or stock resulting from any sub-division,
consolidation or reclassification of such shares).

     "Special Record Date" means five (5) Business Days prior to the last
Business Day of each calendar month commencing 31 October 2003.

     "Stated Maturity," when used with respect to any Indebtedness or any
installment of principal thereof, means the date specified in such Indebtedness
as the fixed date on which the principal of such Indebtedness or such
installment of principal is due and payable.

     "Stock Exchange" means any United States national or regional stock
exchange or quotation service such as NASDAQ National Market System or any
similar quotation service maintained by the National Quotation Bureau or any
successor thereto.

     "Stock Exchange Business Day" means any day (other than a Saturday or
Sunday) on which the a Stock Exchange is open for business.

     "Subordinated Obligation" means any Indebtedness of the Company outstanding
on such date which is contractually subordinate or junior in right of payment to
the Notes.

     "Subsidiary" of any Person means any Corporation of which at least a
majority of the shares of stock having by the terms thereof ordinary voting
power to elect a majority of the Board of Directors of such Corporation
(irrespective of whether or not at the time stock of any other class or classes
of such Corporation shall have or might have voting power by reason of the
happening of any contingency) is directly or indirectly owned or controlled by
the Person.

     "U.S. Government Obligations" means securities that are (x) direct
obligations of the United States of America for the timely payment of which its
full faith and credit is pledged or (y) obligations of a Person controlled or
supervised by and acting as an agency or instrumentality of the United States of
America the timely payment of which is unconditionally guaranteed as a full
faith and credit obligation by the United States of America, which, in either
case, are not callable or redeemable at the option of the issuer thereof, and
shall also include a depository receipt issued by a bank (as defined in Section
3(a)(2) of the Securities Act), as custodian with respect to any such U.S.
Government Obligation or a specific payment of principal of or interest on any
such U.S. Government Obligation held by such custodian for the account of the
holder of such depository receipt, provided that (except as required by law)
such custodian is not authorized to make any deduction from the amount payable
to the holder of such depository receipt from any amount received by the
custodian in respect of the U.S. Government Obligation or the specific payment
of principal of or interest on the U.S. Government Obligation evidenced by such
depository receipt.


                                                                              23

<PAGE>


                                   SCHEDULE A

                          Principal Amount of this Note

     The aggregate principal amount of this Note is as shown by the latest entry
made by or on behalf of the Paying Agent in the fourth column below. Reductions
in the outstanding principal amount of this Note following redemption or the
purchase and cancellation of Notes are entered in the second and third columns
below.

<TABLE>
<CAPTION>
                                                                       Outstanding          Notation made by or on
                        Reasons for change in                           principal       Behalf of the Company (other
                           The outstanding                            Amount of this                than
                         Principal amount of        Amount of      Note following such    In respect of the initial
         Date                   Note               Such change           Change               Principal amount
----------------------------------------------------------------------------------------------------------------------
<S>                     <C>                       <C>              <C>                  <C>
        , 2003             Not applicable         Not applicable                               Not applicable
----------------------------------------------------------------------------------------------------------------------

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

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

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

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

----------------------------------------------------------------------------------------------------------------------
</TABLE>


                                                                              24

<PAGE>




                                   SCHEDULE B

                                Form of Transfer

FOR VALUE RECEIVED, [ ] being the registered holder of this Note hereby
transfers to [ ] of [ ] U.S. $[ ] in principal amount of the US$1,705,000 (the
"Note") of HARKEN ENERGY CORPORATION (the "Issuer") and irrevocably requests and
authorizes the Issuer or its Note Registrar in the capacity as registrar in
relation to the Note to effect the relevant transfer by means of appropriate
entries in the register kept by it.

Dated:




By:      _______________________________
         (duly authorized)

In connection with any transfer of this Note, the undersigned confirms that
documents are being furnished to the registrar which comply with the conditions
set forth in this Note.

The registrar shall not be obligated to register this Note in the name of any
Person other than the Holder hereof unless and until the conditions to any such
registration or transfer set forth here in have been satisfied.

Note

The name of the Person by or on whose behalf this form of transfer is signed
must correspond with the name of the registered holder as it appears on the face
of this Note.

(1)  A representative of such registered holder should state the capacity in
     which he signed, e.g. executor.


(2)  The signature of the Person effecting a transfer shall conform to any list
     of duly authorized specimen signatures supplied by the registered holder or
     be certified by a recognized bank, notary public or in such other manner as
     the registrar may require.

(3)  Any transfer of the Note shall be in an amount equal to U.S.$1,000 or any
     integral multiple of U.S.$1,000 in excess thereof.



                                                                              25

<PAGE>



                                   SCHEDULE C

                    COMPANY'S NOTICE OF REDEMPTION FOR SHARES

To: [Paying Agent] [Noteholder]

     Harken Energy Corporation (the "Company") hereby irrevocably exercises the
option to redeem _______ United States dollars (U.S. $__) principal amount of
the Promissory Note Due 1 September 2003 (the "Notes") of the Company that have
not been previously redeemed and are Outstanding at the date of this notice into
shares of its Common Stock, in accordance with the Terms and Conditions,
pursuant to which the Company has issued its U.S. $1,705,000 Promissory Note,
and confirms that the Redemption Shares issuable and deliverable upon redemption
shall be issued and delivered to the Noteholder in accordance with the
instructions for registration and delivery of the Redemption Shares to each
Holder, to be provided by each Holder to the Paying Agent/Company.

     Each Note so redeemed will be redeemed for the number of Shares of Common
Stock equal to 100% of the face value of the Note divided by U.S. $___ , which
represents the average of the Market Price of the Common Stock over all the
Stock Exchange Days during August 2003.

     All terms used and not otherwise defined herein shall have the respective
meanings set forth in the Terms and Conditions.

DATE:__________________________          HARKEN ENERGY CORPORATION



                                         By:
                                            ------------------------------------
                                         Name:
                                              ----------------------------------
                                         Title:
                                               ---------------------------------

                                      C-1