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                               SECURITY AGREEMENT


   
         THIS SECURITY AGREEMENT ("Agreement") is made as of the 16th day of
January, 1997, by MITCHAM INDUSTRIES, INC., a Texas corporation (hereinafter
called "Debtor"), in favor of BANK ONE, TEXAS, N.A. (hereinafter called
"Secured Party").  Debtor hereby agrees with Secured Party as follows:
    

         1.      DEFINITIONS.  As used in this Agreement, the following terms
                 shall have the meanings indicated below:

                 (a)      The term "Code" shall mean the Uniform Commercial
         Code as in effect in the State of Texas on the date of this Agreement
         or as it may hereafter be amended from time to time.

                 (b)      The term "Collateral" shall mean all of the property
         set forth below:

                          (i)        All present and future accounts, chattel
                 paper, contract rights, documents, instruments, deposit
                 accounts and general intangibles (including any right to
                 payment for goods sold or leased or services rendered arising
                 out of the sale or delivery of personal property or work done
                 or labor performed by Debtor), now or hereafter owned, held,
                 or acquired by Debtor, together with any and all books of
                 account, customer lists and other records relating in any way
                 to the foregoing (including, without limitation, computer
                 software, whether on tape, disk, card, strip, cartridge or any
                 other form), and in any case where an account arises from the
                 sale or lease of goods or equipment, the interest of Debtor in
                 such goods or equipment.

                          (ii)       All finished goods, equipment, fixtures
                 and machinery of whatsoever kind and character now or
                 hereafter possessed, held, acquired or owned by Debtor and
                 held for resale, lease or ordinary disposition in the course
                 of Debtor's business, together with all replacements,
                 accessories, additions, substitutions and accessions to all of
                 the foregoing, all records relating in any way to the
                 foregoing (including, without limitation, any computer
                 software, whether on tape, disk, card, strip, cartridge or any
                 other form).

                          (iii)      All of Debtor's right, title and interest
                 in, to and under (a) present or future leases, rental
                 contracts and any other contracts for the use or operation of
                 any equipment owned by Debtor (each a "Lease" collectively,
                 "Leases") for and all rental payments and other monies from
                 time to time payable to or
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                 receivable by Debtor under the Leases, including all proceeds
                 thereof, and (b) all of Debtor's rights, powers and remedies
                 under the Leases.

                 The term Collateral, as used herein, shall also include all
         PRODUCTS and PROCEEDS of all of the foregoing (including without
         limitation, insurance payable by reason of loss or damage to the
         foregoing property) and any property, securities, guaranties or monies
         of Debtor which may at any time come into the possession of Secured
         Party (as hereinafter defined).  The designation of proceeds does not
         authorize Debtor to sell, transfer or otherwise convey any of the
         foregoing property except finished goods intended for sale in the
         ordinary course of Debtor's business or as otherwise provided herein.

                 (c)      The term "Indebtedness" shall mean:

                          (i)        all indebtedness, obligations and
                 liabilities of Debtor to Secured Party of any kind or
                 character, now existing or hereafter arising, whether direct,
                 indirect, related, unrelated, fixed, contingent, liquidated,
                 unliquidated, joint, several or joint and several, and
                 regardless of whether such indebtedness, obligations and
                 liabilities may, prior to their acquisition by Secured Party,
                 be or have been payable to or in favor of a third party and
                 subsequently acquired by Secured Party (it being contemplated
                 that Secured Party may make such acquisitions from third
                 parties), including without limitation all indebtedness,
                 obligations and liabilities of Debtor to Secured Party now
                 existing or hereafter arising by note, draft, acceptance,
                 guaranty, endorsement, letter of credit, assignment, purchase,
                 overdraft, discount, indemnity agreement or otherwise, (ii)
                 all accrued but unpaid interest on any of the indebtedness
                 described in (i) above, (iii) all obligations of Debtor to
                 Secured Party under any documents evidencing, securing,
                 governing and/or pertaining to all or any part of the
                 indebtedness described in (i) and (ii) above, (iv) all costs
                 and expenses incurred by Secured Party in connection with the
                 collection and administration of all or any part of the
                 indebtedness and obligations described in (i), (ii) and (iii)
                 above or the protection or preservation of, or realization
                 upon, the collateral securing all or any part of such
                 indebtedness and obligations, including without limitation all
                 reasonable attorneys' fees, and (v) all renewals, extensions,
                 modifications and rearrangements of the indebtedness and
                 obligations described in (i), (ii), (iii) and (iv) above,
                 including, without limitation, the Notes of even date herewith
                 in the principal amounts of $4,000,000.00 (the "Revolving Line
                 of Credit") and





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                 $1,000,000.00 (the "Term Loan") (collectively, the "Notes"),
                 and all accrued but unpaid interest on the Notes.

                 (f)      The term "Loan Documents" shall mean all instruments
         and documents evidencing, securing, governing, guaranteeing and/or
         pertaining to the Indebtedness.

                 (g)      The term "Obligated Party" shall mean any party other
         than Debtor who secures, guarantees and/or is otherwise obligated to
         pay all or any portion of the Indebtedness.

                 (h)      The term "Secured Party" shall mean Bank One, Texas,
         N.A., and its successors and assigns, including without limitation,
         any party to whom Secured Party, or its successors or assigns, may
         assign its rights and interests under this Agreement.

All words and phrases used herein which are expressly defined in Section 1.201
or Chapter 9 of the Code shall have the meaning provided for therein.  Other
words and phrases defined elsewhere in the Code shall have the meaning
specified therein except to the extent such meaning is inconsistent with a
definition in Section 1.201 or Chapter 9 of the Code.

         2.      SECURITY INTEREST.  As security for the Indebtedness, Debtor,
for value received, hereby grants to Secured Party a continuing security
interest in the Collateral.

         3.      REPRESENTATIONS AND WARRANTIES.  Debtor hereby represents and
warrants the following to Secured Party:

                 (a)      Due Authorization.  The execution, delivery and
         performance of this Agreement and all of the other Loan Documents by
         Debtor have been duly authorized by all necessary corporate action of
         Debtor, to the extent Debtor is a corporation.

                 (b)      Enforceability.  This Agreement and the other Loan
         Documents constitute legal, valid and binding obligations of Debtor,
         enforceable in accordance with their respective terms, except as
         limited by bankruptcy, insolvency or similar laws of general
         application relating to the enforcement of creditors' rights and
         except to the extent specific remedies may generally be limited by
         equitable principles.

                 (c)      Ownership and Liens.  Debtor has good and marketable
         title to the Collateral free and clear of all liens, security
         interests, encumbrances or adverse claims, except for the security
         interest created by this Agreement.  No dispute, right of setoff,
         counterclaim or defense exists with respect to all or any part of the
         Collateral.  Debtor has not executed





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         any other security agreement currently affecting the Collateral and no
         effective financing statement or other instrument similar in effect
         covering all or any part of the Collateral is on file in any recording
         office except as may have been executed or filed in favor of Secured
         Party.

                 (d)      No Conflicts or Consents.  Neither the ownership, the
         intended use of the Collateral by Debtor, the grant of the security
         interest by Debtor to Secured Party herein nor the exercise by Secured
         Party of its rights or remedies hereunder, will (i) conflict with any
         provision of (A) any domestic or foreign law, statute, rule or
         regulation, (B) the articles or certificate of incorporation, charter,
         bylaws or partnership agreement, as the case may be, of Debtor, or (C)
         any agreement, judgment, license, order or permit applicable to or
         binding upon Debtor, or (ii) result in or require the creation of any
         lien, charge or encumbrance upon any assets or properties of Debtor or
         of any person except as may be expressly contemplated in the Loan
         Documents.  Except as expressly contemplated in the Loan Documents, no
         consent, approval, authorization or order of, and no notice to or
         filing with, any court, governmental authority or third party is
         required in connection with the grant by Debtor of the security
         interest herein or the exercise by Secured Party of its rights and
         remedies hereunder.

                 (e)      Security Interest.  Debtor has and will have at all
         times full right, power and authority to grant a security interest in
         the Collateral to Secured Party in the manner provided herein, free
         and clear of any lien (other than liens held by Secured Party),
         security interest or other charge or encumbrance.  This Agreement
         creates a legal, valid and binding security interest in favor of
         Secured Party in the Collateral securing the Indebtedness.  Possession
         by Secured Party of all certificates, instruments and cash
         constituting Collateral from time to time and/or the filing of the
         financing statements delivered prior hereto and/or concurrently
         herewith by Debtor to Secured Party will perfect and establish the
         first priority of Secured Party's security interest hereunder in the
         Collateral.

                 (f)      Location.  Debtor's residence or chief executive
         office, as the case may be, and the office where the records
         concerning the Collateral are kept is located at its address set forth
         on the signature page hereof.

                 (g)      Solvency of Debtor.  As of the date hereof, and after
         giving effect to this Agreement and the completion of all other
         transactions contemplated by Debtor at the time of the execution of
         this Agreement, (i) Debtor is and will be solvent, (ii) the fair
         saleable value of Debtor's assets exceeds and will continue to exceed
         Debtor's liabilities (both





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         fixed and contingent), (iii) Debtor is paying and will continue to be
         able to pay its debts as they mature, and (iv) if Debtor is not an
         individual, Debtor has and will have sufficient capital to carry on
         Debtor's businesses and all businesses in which Debtor is about to
         engage.

                 (h)      Compliance with Environmental Laws.  Except as
         disclosed in writing to Secured Party: (i) Debtor is conducting
         Debtor's businesses in material compliance with all applicable
         federal, state and local laws, statutes, ordinances, rules,
         regulations, orders, determinations and court decisions, including
         without limitation, those pertaining to health or environmental
         matters such as the Comprehensive Environmental Response,
         Compensation, and Liability Act of 1980, as amended by the Superfund
         Amendments and Reauthorization Act of 1986 (collectively, together
         with any subsequent amendments, hereinafter called "CERCLA"), the
         Resource Conservation and Recovery Act of 1976, as amended by the Used
         Oil Recycling Act of 1980, the Solid Waste Disposal Act Amendments of
         1980, and the Hazardous Substance Waste Amendments of 1984
         (collectively, together with any subsequent amendments, hereinafter
         called "RCRA"), the Texas Water Code and the Texas Solid Waste
         Disposal Act; (ii) none of the operations of Debtor is the subject of
         a federal, state or local investigation evaluating whether any
         material remedial action is needed to respond to a release or disposal
         of any toxic or hazardous substance or solid waste into the
         environment; (iii) Debtor has not filed any notice under any federal,
         state or local law indicating that Debtor is responsible for the
         release into the environment, the disposal on any premises in which
         Debtor is conducting its businesses or the improper storage, of any
         material amount of any toxic or hazardous substance or solid waste or
         that any such toxic or hazardous substance or solid waste has been
         released, disposed of or is improperly stored, upon any premise on
         which Debtor is conducting its businesses; and (iv) Debtor otherwise
         does not have any known material contingent liability in connection
         with the release into the environment, disposal or the improper
         storage, of any such toxic or hazardous substance or solid waste.  The
         terms "hazardous substance" and "release", as used herein, shall have
         the meanings specified in CERCLA, and the terms "solid waste" and
         "disposal", as used herein, shall have the meanings specified in RCRA;
         provided, however, that to the extent that the laws of the State of
         Texas establish meanings for such terms which are broader than that
         specified in either CERCLA or RCRA, such broader meanings shall apply.

                 (i)      Accounts.  Each account represents the valid and
         legally binding indebtedness of a bona fide account debtor arising
         from the sale or lease by Debtor of goods or the rendition by Debtor
         of services and is not subject to contra





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         accounts, setoffs, defenses or counterclaims by or available to
         account debtors obligated on the accounts except as disclosed by
         Debtor to Secured Party from time to time in writing.  The amount
         shown as to each account on Debtor's books is the true and undisputed
         amount owing and unpaid thereon, subject only to discounts,
         allowances, rebates, credits and adjustments to which the account
         debtor has a right and which have been disclosed to Secured Party in
         writing.

                 (j)      Chattel Paper, Documents and Instruments.  The
         chattel paper, documents and instruments of Debtor pledged hereunder
         have only one original counterpart and no party other than Debtor or
         Secured Party is in actual or constructive possession of any such
         chattel paper, documents or instruments.

         4.      AFFIRMATIVE COVENANTS.  Debtor will comply with the covenants
contained in this Section 4 at all times during the period of time this
Agreement is effective unless Secured Party shall otherwise consent in writing.

                 (a)      Ownership and Liens.  Debtor will maintain good and
         marketable title to all Collateral free and clear of all liens,
         security interests, encumbrances or adverse claims, except for the
         security interest created by this Agreement and the security interests
         and other encumbrances expressly permitted by the other Loan
         Documents.  Debtor will not permit any dispute, right of setoff,
         counterclaim or defense to exist with respect to all or any part of
         the Collateral.  Debtor will cause any financing statement or other
         security instrument with respect to the Collateral to be terminated,
         except as may exist or as may have been filed in favor of Secured
         Party.  Debtor will defend at its expense Secured Party's right, title
         and security interest in and to the Collateral against the claims of
         any third party.

                 (b)      Further Assurances.  Debtor will from time to time at
         its expense promptly execute and deliver all further instruments and
         documents and take all further action necessary or appropriate or that
         Secured Party may request in order (i) to perfect and protect the
         security interest created or purported to be created hereby and the
         first priority of such security interest, (ii) to enable Secured Party
         to exercise and enforce its rights and remedies hereunder in respect
         of the Collateral, and (iii) to otherwise effect the purposes of this
         Agreement, including without limitation:  (A) executing and filing
         such financing or continuation statements, or amendments thereto; and
         (B) furnishing to Secured Party from time to time statements and
         schedules further identifying and describing the Collateral and such





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         other reports in connection with the Collateral, all in reasonable
         detail satisfactory to Secured Party.

                 (c)      Inspection of Collateral.  Debtor will keep adequate
         records concerning the Collateral and will permit Secured Party and
         all representatives and agents appointed by Secured Party to inspect
         any of the Collateral and the books and records of or relating to the
         Collateral at any time during normal business hours, to make and take
         away photocopies, photographs and printouts thereof and to write down
         and record any such information.

                 (d)      Payment of Taxes.  Debtor (i) will timely pay all
         property and other taxes, assessments and governmental charges or
         levies imposed upon the Collateral or any part thereof, (ii) will
         timely pay all lawful claims which, if unpaid, might become a lien or
         charge upon the Collateral or any part thereof, and (iii) will
         maintain appropriate accruals and reserves for all such liabilities in
         a timely fashion in accordance with generally accepted accounting
         principles.  Debtor may, however, delay paying or discharging any such
         taxes, assessments, charges, claims or liabilities so long as the
         validity thereof is contested in good faith by proper proceedings and
         provided Debtor has set aside on Debtor's books adequate reserves
         therefor; provided, however, Debtor understands and agrees that in the
         event of any such delay in payment or discharge and upon Secured
         Party's written request, Debtor will establish with Secured Party an
         escrow acceptable to Secured Party adequate to cover the payment of
         such taxes, assessments and governmental charges with interest, costs
         and penalties and a reasonable additional sum to cover possible costs,
         interest and penalties (which escrow shall be returned to Debtor upon
         payment of such taxes, assessments, governmental charges, interests,
         costs and penalties or disbursed in accordance with the resolution of
         the contest to the claimant) or furnish Secured Party with an
         indemnity bond secured by a deposit in cash or other security
         acceptable to Secured Party.  Notwithstanding any other provision
         contained in this Subsection, Secured Party may at its discretion
         exercise its rights under Subsection 6(c) at any time to pay such
         taxes, assessments, governmental charges, interest, costs and
         penalties.

                 (e)      Mortgagee's and Landlord's Waivers.  Debtor shall
         cause each mortgagee of real property owned by Debtor and each
         landlord of real property leased by Debtor to execute and deliver
         agreements satisfactory in form and substance to Secured Party by
         which such mortgagee or landlord waives or subordinates any rights it
         may have in the Collateral.

                 (f)      Condition of Goods.  Debtor will maintain, preserve,
         protect and keep all Collateral which constitutes goods or





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         Equipment in good condition, repair and working order and will cause
         such Collateral to be used and operated in good and workmanlike
         manner, in accordance with applicable laws and in a manner which will
         not make void or cancelable any insurance with respect to such
         Collateral.  Debtor will promptly make or cause to be made all
         repairs, replacements and other improvements to or in connection with
         the Collateral which Secured Party may request from time to time.

                 (g)      Insurance.  Debtor will, at its own expense, maintain
         insurance with respect to all Collateral which constitutes goods or
         Equipment in such amounts, against such risks, in such form and with
         such insurers, as shall be satisfactory to Secured Party from time to
         time.  If requested by Secured Party, each policy for property damage
         insurance shall provide for all losses to be paid directly to Secured
         Party.  If requested by Secured Party, each policy of insurance
         maintained by Debtor shall (i) name Debtor and Secured Party as
         insured parties thereunder (without any representation or warranty by
         or obligation upon Secured Party) as their interests may appear, (ii)
         contain the agreement by the insurer that any loss thereunder shall be
         payable to Secured Party notwithstanding any action, inaction or
         breach of representation or warranty by Debtor, (iii) provide that
         there shall be no recourse against Secured Party for payment of
         premiums or other amounts with respect thereto, and (iv) provide that
         at least thirty (30) days prior written notice of cancellation or of
         lapse shall be given to Secured Party by the insurer.  Debtor will, if
         requested by Secured Party, deliver to Secured Party original or
         duplicate policies of such insurance and, as often as Secured Party
         may reasonably request, a report of a reputable insurance broker with
         respect to such insurance.  Debtor will also, at the request of
         Secured Party, duly execute and deliver instruments of assignment of
         such insurance policies and cause the respective insurers to
         acknowledge notice of such assignment. All insurance payments in
         respect of loss of or damage to any Collateral shall be paid to
         Secured Party and applied as Secured Party in its sole discretion
         deems appropriate.

                 (h)      Accounts and General Intangibles.  Debtor will,
         except as otherwise provided in Subsection 6(e), collect, at Debtor's
         own expense, all amounts due or to become due under each of the
         accounts and general intangibles.  In connection with such
         collections, Debtor may and, at Secured Party's direction, will take
         such action not otherwise forbidden by Subsection 5(e) as Debtor or
         Secured Party may deem necessary or advisable to enforce collection or
         performance of each of the accounts and general intangibles.  Debtor
         will also duly perform and cause to be performed all of its
         obligations with respect to the goods or services, the sale or lease
         or rendition of which gave rise or will give rise to each account





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         and all of its obligations to be performed under or with respect to
         the general intangibles.  Debtor also covenants and agrees to take any
         action and/or execute any documents that Secured Party may request in
         order to comply with the Federal Assignment of Claims Act, as amended.

                 (i)      Chattel Paper, Documents and Instruments.  Debtor
         will take such action as may be requested by Secured Party in order to
         cause any chattel paper, documents or instruments to be valid and
         enforceable and will cause all chattel paper to have only one original
         counterpart.  Upon request by Secured Party, Debtor will deliver to
         Secured Party all originals of chattel paper, documents or instruments
         and will mark all chattel paper with a legend indicating that such
         chattel paper is subject to the security interest granted hereunder.

                 (j)      Equipment.  Debtor will furnish Secured Party with
         written notice within two (2) business days of Debtor's knowledge, or
         reasonable belief, of the occurrence from time to time of any change
         in the location of any part of the Collateral that is not within the
         United States of America and Canada.

         5.      NEGATIVE COVENANTS.  Debtor will comply with the covenants
contained in this Section 5 at all times during the period of time this
Agreement is effective, unless Secured Party shall otherwise consent in
writing.

                 (a)      Transfer or Encumbrance.  Debtor will not (i) sell,
         assign (by operation of law or otherwise), transfer, exchange, lease
         or otherwise dispose of any of the Collateral, (ii) grant a lien or
         security interest in or execute, file or record any financing
         statement or other security instrument with respect to the Collateral
         to any party other than Secured Party, or (iii) deliver actual or
         constructive possession of any of the Collateral to any party other
         than Secured Party, except for (A) sales and leases of leased
         equipment and the sale of inventory in the ordinary course of
         business, and (B) the sale or other disposal of any item of equipment
         which is worn out or obsolete and which has been replaced by an item
         of equal suitability and value, owned by Debtor and made subject to
         the security interest under this Agreement, but which is otherwise
         free and clear of any lien, security interest, encumbrance or adverse
         claim; provided, however, the exceptions permitted in clauses (A) and
         (B) above shall automatically terminate upon the occurrence of an
         Event of Default.

                 (b)      Impairment of Security Interest.  Debtor will not
         take or fail to take any action which would in any manner impair the
         value or enforceability of Secured Party's security interest in any
         Collateral.





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                 (c)      Possession of Collateral.  Debtor will not cause or
         permit the removal of any Collateral from its possession, control and
         risk of loss other than (i) as permitted by Subsection 4(j) and/or
         5(a), or (ii) in connection with the possession of any Collateral by
         Secured Party or by its bailee.  Notwithstanding the foregoing, Debtor
         will not cause or permit the removal of 50% of the Collateral from the
         United States of America and Canada.

                 (d)      Goods.  Debtor will not permit any Collateral which
         constitutes goods to at any time (i) be covered by any document except
         documents in the possession of the Secured Party, (ii) become so
         related to, attached to or used in connection with any particular real
         property so as to become a fixture upon such real property, or (iii)
         be installed in or affixed to other goods so as to become an accession
         to such other goods unless such other goods are subject to a perfected
         first priority security interest under this Agreement.

                 (e)      Compromise of Collateral.  Debtor will not adjust,
         settle, compromise, amend or modify any Collateral, except an
         adjustment, settlement, compromise, amendment or modification in good
         faith and in the ordinary course of business; provided, however, this
         exception shall automatically terminate upon the occurrence of an
         Event of Default or upon Secured Party's written request.  Debtor
         shall provide to Secured Party such information concerning (i) any
         adjustment, settlement, compromise, amendment or modification of any
         Collateral, and (ii) any claim asserted by any account debtor for
         credit, allowance, adjustment, dispute, setoff or counterclaim, as
         Secured Party may request from time to time.

                 (f)      Financing Statement Filings.  Debtor recognizes that
         financing statements pertaining to the Collateral have been or may be
         filed where Debtor maintains any Collateral, has its records
         concerning any Collateral or has its residence or chief executive
         office, as the case may be.  Without limitation of any other covenant
         herein, Debtor will not cause or permit any change in the location of
         (i) any Collateral (except as permitted in that certain Letter Loan
         Agreement, of even date herewith, entered into by and between Debtor
         and Secured Party), (ii) any records concerning any Collateral, or
         (iii) Debtor's residence or  chief executive office, as the case may
         be, to a jurisdiction other than as represented in Subsection 3(f)
         unless Debtor shall have notified Secured Party in writing of such
         change at least thirty (30) days prior to the effective date of such
         change, and shall have first taken all action required by Secured
         Party for the purpose of further perfecting or protecting the security
         interest in favor of Secured Party in the Collateral or unless
         otherwise permitted by Section 4.(j) hereof.  In any written notice
         furnished pursuant to this Subsection, Debtor will





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         expressly state that the notice is required by this Agreement and
         contains facts that may require additional filings of financing
         statements or other notices for the purpose of continuing perfection
         of Secured Party's security interest in the Collateral.

         6.      RIGHTS OF SECURED PARTY.  Secured Party shall have the rights
contained in this Section 6 at all times during the period of time this
Agreement is effective.

                 (a)      Additional Financing Statements Filings.  Debtor
         hereby authorizes Secured Party to file, without the signature of
         Debtor, one or more financing or continuation statements, and
         amendments thereto, relating to the Collateral.  Debtor further agrees
         that a carbon, photographic or other reproduction of this Security
         Agreement or any financing statement describing any Collateral is
         sufficient as a financing statement and may be filed in any
         jurisdiction Secured Party may deem appropriate.

                 (b)      Power of Attorney.  Debtor hereby irrevocably
         appoints Secured Party as Debtor's attorney-in-fact, such power of
         attorney being coupled with an interest, with full authority in the
         place and stead of Debtor and in the name of Debtor or otherwise, from
         time to time in Secured Party's discretion, to take any action and to
         execute any instrument which Secured Party may deem necessary or
         appropriate to accomplish the purposes of this Agreement, including
         without limitation:  (i) to obtain and adjust insurance required by
         Secured Party hereunder; (ii) to demand, collect, sue for, recover,
         compound, receive and give acquittance and receipts for moneys due and
         to become due under or in respect of the Collateral; (iii) to receive,
         endorse and collect any drafts or other instruments, documents and
         chattel paper in connection with clause (i) or (ii) above; and (iv) to
         file any claims or take any action or institute any proceedings which
         Secured Party may deem necessary or appropriate for the collection
         and/or preservation of the Collateral or otherwise to enforce the
         rights of Secured Party with respect to the Collateral.

                 (c)      Performance by Secured Party.  If Debtor fails to
         perform any agreement or obligation provided herein, Secured Party may
         itself perform, or cause performance of, such agreement or obligation,
         and the expenses of Secured Party incurred in connection therewith
         shall be a part of the Indebtedness, secured by the Collateral and
         payable by Debtor on demand.

                 (d)      Debtor's Receipt of Proceeds.  All amounts and
         proceeds (including instruments and writings) received by Debtor in
         respect of such accounts or general intangibles





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         shall be received in trust for the benefit of Secured Party hereunder
         and, upon request of Secured Party, shall be segregated from other
         property of Debtor and shall be forthwith delivered to Secured Party
         in the same form as so received (with any necessary endorsement) and
         applied to the Indebtedness in such manner as Secured Party deems
         appropriate in its sole discretion.

                 (e)      Notification of Account Debtors.  If Secured Party
         has a reasonable basis to believe an Event of Default has occurred, or
         with the passage of time, could occur, Secured Party may at its
         discretion notify any or all obligors under any accounts or general
         intangibles (i) of Secured Party's security interest in such accounts
         or general intangibles and direct such obligors to make payment of all
         amounts due or to become due to Debtor thereunder directly to Secured
         Party, and (ii) to verify the accounts or general intangibles with
         such obligors.  Secured Party shall have the right, at the expense of
         Debtor, to enforce collection of any such accounts or general
         intangibles and to adjust, settle or compromise the amount or payment
         thereof, in the same manner and to the same extent as Debtor.


         7.      EVENTS OF DEFAULT.  Each of the following constitutes an
"Event of Default" under this Agreement:

                 (a)      Failure to Pay Indebtedness.  The failure, refusal or
         neglect of Debtor to make any payment of principal or interest on the
         Indebtedness or any other amounts owing by Debtor to Secured Party, or
         any portion thereof, as the same shall become due and payable; or

                 (b)      Non-Performance of Covenants.  The failure of Debtor
         or any Obligated Party to timely and properly observe, keep or perform
         any covenant, agreement, warranty or condition required herein or in
         any of the other Loan Documents; or

                 (c)      Default Under other Loan Documents.  The occurrence
         of an event of default under any of the other Loan Documents or any
         other agreement between Debtor and Secured Party; or

                 (d)      False Representation.  Any representation contained
         herein or in any of the other Loan Documents made by Debtor or any
         Obligated Party is false or misleading in any material respect; or

                 (e)      Default to Third Party.  The occurrence of any event
         which permits the acceleration of the maturity of any indebtedness
         owing by Debtor or any Obligated Party to any third party under any
         agreement or undertaking; or





                                      -12-
   13
                 (f)      Bankruptcy or Insolvency.  If Debtor or any Obligated
         Party:

                               (i)     becomes insolvent, or makes a transfer
                 in fraud of creditors, or makes an assignment for the benefit
                 of creditors, or admits in writing its inability to pay its
                 debts as they become due; or

                              (ii)     generally is not paying its debts as
                 such debts become due; or

                             (iii)     has a receiver or custodian appointed
                 for, or take possession of, all or substantially all of the
                 assets of such party or any of the Collateral, either in a
                 proceeding brought by such party or in a proceeding brought
                 against such party and such appointment is not discharged or
                 such possession is not terminated within thirty (30) days
                 after the effective date thereof or such party consents to or
                 acquiesces in such appointment or possession; or

                              (iv)     files a petition for relief under the
                 United States Bankruptcy Code or any other present or future
                 federal or state insolvency, bankruptcy or similar laws (all
                 of the foregoing hereinafter collectively called "Applicable
                 Bankruptcy Law") or an involuntary petition for relief is
                 filed against such party under any Applicable Bankruptcy Law
                 and such involuntary petition is not dismissed within thirty
                 (30) days after the filing thereof, or an order for relief
                 naming such party is entered under any Applicable Bankruptcy
                 Law, or any composition, rearrangement, extension,
                 reorganization or other relief of debtors now or hereafter
                 existing is requested or consented to by such party; or

                               (v)     fails to have discharged within a period
                 of thirty (30) days any attachment, sequestration or similar
                 writ levied upon any property of such party; or

                              (vi)     fails to pay within thirty (30) days any
                 final money judgment against such party; or

                 (g)      Execution on Collateral.  The Collateral or any
         portion thereof is taken on execution or other process of law in any
         action against Debtor; or

                 (h)      Abandonment.  Debtor abandons the Collateral or any
         portion thereof; or

                 (i)      Action by Other Lienholder.  The holder of any lien
         or security interest on any of the assets of Debtor, including





                                      -13-
   14
         without limitation, the Collateral (without hereby implying the
         consent of Secured Party to the existence or creation of any such lien
         or security interest on the Collateral), declares a default thereunder
         or institutes foreclosure or other proceedings for the enforcement of
         its remedies thereunder; or

                 (j)      Liquidation, Death and Related Events.  If Debtor or
         any Obligated Party is an entity, the liquidation, dissolution, merger
         or consolidation of any such entity or, if Debtor or any Obligated
         Party is an individual, the death or legal incapacity of any such
         individual.

         8.      REMEDIES AND RELATED RIGHTS.  If an Event of Default shall
have occurred, and without limiting any other rights and remedies provided
herein, under any of the other Loan Documents or otherwise available to Secured
Party, Secured Party may exercise one or more of the rights and remedies
provided in this Section.

                 (a)      Remedies.  Secured Party may from time to time at its
         discretion, without limitation and without notice except as expressly
         provided in any of the Loan Documents:

                               (i)     exercise in respect of the Collateral
                 all the rights and remedies of a secured party under the Code
                 (whether or not the Code applies to the affected Collateral);

                              (ii)     require Debtor to, and Debtor hereby
                 agrees that it will at its expense and upon request of Secured
                 Party, assemble the Collateral as directed by Secured Party
                 and make it available to Secured Party at a place to be
                 designated by Secured Party which is reasonably convenient to
                 both parties;

                             (iii)     reduce its claim to judgment or
                 foreclose or otherwise enforce, in whole or in part, the
                 security interest granted hereunder by any available judicial
                 procedure;

                              (iv)     sell or otherwise dispose of, at its
                 office, on the premises of Debtor or elsewhere, the
                 Collateral, as a unit or in parcels, by public or private
                 proceedings, and by way of one or more contracts (it being
                 agreed that the sale or other disposition of any part of the
                 Collateral shall not exhaust Secured Party's power of sale,
                 but sales or other dispositions may be made from time to time
                 until all of the Collateral has been sold or disposed of or
                 until the Indebtedness has been paid and performed in full),
                 and at any such sale or other disposition it shall not be
                 necessary to exhibit any of the Collateral;





                                      -14-
   15
                               (v)     buy the Collateral, or any portion
                 thereof, at any public sale;

                              (vi)     buy the Collateral, or any portion
                 thereof, at any private sale if the Collateral is of a type
                 customarily sold in a recognized market or is of a type which
                 is the subject of widely distributed standard price
                 quotations;

                             (vii)     apply for the appointment of a receiver
                 for the Collateral, and Debtor hereby consents to any such
                 appointment; and

                            (viii)     at its option, retain the Collateral in
                 satisfaction of the Indebtedness whenever the circumstances
                 are such that Secured Party is entitled to do so under the
                 Code or otherwise.

         Debtor agrees that in the event Debtor is entitled to receive any
         notice under the Uniform Commercial Code, as it exists in the state
         governing any such notice, of the sale or other disposition of any
         Collateral, reasonable notice shall be deemed given when such notice
         is deposited in a depository receptacle under the care and custody of
         the United States Postal Service, postage prepaid, at Debtor's address
         set forth on the signature page hereof, five (5) days prior to the
         date of any public sale, or after which a private sale, of any of such
         Collateral is to be held.  Secured Party shall not be obligated to
         make any sale of Collateral regardless of notice of sale having been
         given.  Secured Party may adjourn any public or private sale from time
         to time by announcement at the time and place fixed therefor, and such
         sale may, without further notice, be made at the time and place to
         which it was so adjourned.

         (b)     Application of Proceeds.  If any Event of Default shall have
occurred, Secured Party may at its discretion apply or use any cash held by
Secured Party as Collateral, and any cash proceeds received by Secured Party in
respect of any sale or other disposition of, collection from, or other
realization upon, all or any part of the Collateral as follows in such order
and manner as Secured Party may elect:

                               (i)     to the repayment or reimbursement of the
                 reasonable costs and expenses (including, without limitation,
                 reasonable attorneys' fees and expenses) incurred by Secured
                 Party in connection with (A) the administration of the Loan
                 Documents, (B) the custody, preservation, use or operation of,
                 or the sale of, collection from, or other realization upon,
                 the Collateral, and (C) the exercise or enforcement of any of
                 the rights and remedies of Secured Party hereunder;





                                      -15-
   16
                              (ii)     to the payment or other satisfaction of
                 any liens and other encumbrances upon the Collateral;

                             (iii)     to the satisfaction of the Indebtedness;

                              (iv)     by holding such cash and proceeds as
                 Collateral;

                               (v)     to the payment of any other amounts
                 required by applicable law (including without limitation,
                 Section 9.504(a)(3) of the Code or any other applicable
                 statutory provision); and

                              (vi)     by delivery to Debtor or any other party
                 lawfully entitled to receive such cash or proceeds whether by
                 direction of a court of competent jurisdiction or otherwise.

                 (c)      Deficiency.  In the event that the proceeds of any
         sale of, collection from, or other realization upon, all or any part
         of the Collateral by Secured Party are insufficient to pay all amounts
         to which Secured Party is legally entitled, Debtor and any party who
         guaranteed or is otherwise obligated to pay all or any portion of the
         Indebtedness shall be liable for the deficiency, together with
         interest thereon as provided in the Loan Documents.

                 (d)      Non-Judicial Remedies.  In granting to Secured Party
         the power to enforce its rights hereunder without prior judicial
         process or judicial hearing, Debtor expressly waives, renounces and
         knowingly relinquishes any legal right which might otherwise require
         Secured Party to enforce its rights by judicial process.  Debtor
         recognizes and concedes that non-judicial remedies are consistent with
         the usage of trade, are responsive to commercial necessity and are the
         result of a bargain at arm's length.  Nothing herein is intended to
         prevent Secured Party or Debtor from resorting to judicial process at
         either party's option.

                 (e)      Other Recourse.  Debtor waives any right to require
         Secured Party to proceed against any third party, exhaust any
         Collateral or other security for the Indebtedness, or to have any
         third party joined with Debtor in any suit arising out of the
         Indebtedness or any of the Loan Documents, or pursue any other remedy
         available to Secured Party.  Debtor further waives any and all notice
         of acceptance of this Agreement and of the creation, modification,
         rearrangement, renewal or extension of the Indebtedness.  Debtor
         further waives any defense arising by reason of any disability or
         other defense of any third party or by reason of the cessation from
         any cause whatsoever of the liability of any third party.  Until all
         of the Indebtedness shall have been paid in full, Debtor





                                      -16-
   17
         shall have no right of subrogation and Debtor waives the right to
         enforce any remedy which Secured Party has or may hereafter have
         against any third party, and waives any benefit of and any right to
         participate in any other security whatsoever now or hereafter held by
         Secured Party.  Debtor authorizes Secured Party, and without notice or
         demand and without any reservation of rights against Debtor and
         without affecting Debtor's liability hereunder or on the Indebtedness
         to (i) take or hold any other property of any type from any third
         party as security for the Indebtedness, and exchange, enforce, waive
         and release any or all of such other property, (ii) apply such other
         property and direct the order or manner of sale thereof as Secured
         Party may in its discretion determine, (iii) renew, extend,
         accelerate, modify, compromise, settle or release any of the
         Indebtedness or other security for the Indebtedness, (iv) waive,
         enforce or modify any of the provisions of any of the Loan Documents
         executed by any third party, and (v) release or substitute any third
         party.

         9.      INDEMNITY.  Debtor hereby indemnifies and agrees to hold
harmless Secured Party, and its officers, directors, employees, agents and
representatives (each an "Indemnified Person") from and against any and all
liabilities, obligations, claims, losses, damages, penalties, actions,
judgments, suits, costs, expenses or disbursements of any kind or nature,
including, but not limited to attorney's fees and any settlement costs,
(collectively, the "Claims") which may be imposed on, incurred by, or  asserted
against, any Indemnified Person (whether or not caused by any Indemnified
Person's sole, concurrent or contributory negligence) arising in connection
with the Loan Documents, the Indebtedness or the Collateral (including without
limitation, the enforcement of the Loan Documents and the defense of any
Indemnified Person's actions and/or inactions in connection with the Loan
Documents), except to the limited extent the Claims against an Indemnified
Person are proximately caused by such Indemnified Person's gross negligence or
willful misconduct.  If Debtor or any third party ever alleges such gross
negligence or willful misconduct by any Indemnified Person, the indemnification
provided for in this Section shall nonetheless be paid upon demand, subject to
later adjustment or reimbursement, until such time as a court of competent
jurisdiction enters a final judgment as to the extent and effect of the alleged
gross negligence or willful misconduct.  The indemnification provided for in
this Section shall survive the termination of this Agreement and shall extend
and continue to benefit each individual or entity who is or has at any time
been an Indemnified Person hereunder.

         10.     MISCELLANEOUS.

                 (a)      Entire Agreement.  This Agreement contains the entire
         agreement of Secured Party and Debtor with respect to





                                      -17-
   18
         the Collateral.  If the parties hereto are parties to any prior
         agreement, either written or oral, relating to the Collateral, the
         terms of this Agreement shall amend and supersede the terms of such
         prior  agreements as to transactions on or after the effective date of
         this Agreement, but all security agreements, financing statements,
         guaranties, other contracts and notices for the benefit of Secured
         Party shall continue in full force and effect to secure the
         Indebtedness unless Secured Party specifically releases its rights
         thereunder by separate release.

                 (b)      Amendment.  No modification, consent or amendment of
         any provision of this Agreement or any of the other Loan Documents
         shall be valid or effective unless the same is in writing and signed
         by the party against whom it is sought to be enforced.

                 (c)      Actions by Secured Party.  The lien, security
         interest and other security rights of Secured Party hereunder shall
         not be impaired by (i) any renewal, extension, increase or
         modification with respect to the Indebtedness, (ii) any surrender,
         compromise, release, renewal, extension, exchange or substitution
         which Secured Party may grant with respect to the Collateral, or (iii)
         any release or indulgence granted to any endorser, guarantor or surety
         of the Indebtedness.  The taking of additional security by Secured
         Party shall not release or impair the lien, security interest or other
         security rights of Secured Party hereunder or affect the obligations
         of Debtor hereunder.

                 (d)       Waiver by Secured Party.  Secured Party may waive
         any Event of Default without waiving any other prior or subsequent
         Event of Default.  Secured Party may remedy any default without
         waiving the Event of Default remedied.  Neither the failure by Secured
         Party to exercise, nor the delay by Secured Party in exercising, any
         right or remedy upon any Event of Default shall be construed as a
         waiver of such Event of Default or as a waiver of the right to
         exercise any such right or remedy at a later date.  No single or
         partial exercise by Secured Party of any right or remedy hereunder
         shall exhaust the same or shall preclude any other or further exercise
         thereof, and every such right or remedy hereunder may be exercised at
         any time.  No waiver of any provision hereof or consent to any
         departure by Debtor therefrom shall be effective unless the same shall
         be in writing and signed by Secured Party and then such waiver or
         consent shall be effective only in the specific instances, for the
         purpose for which given and to the extent therein specified.  No
         notice to or demand on Debtor in any case shall of itself entitle
         Debtor to any other or further notice or demand in similar or other
         circumstances.





                                      -18-
   19
                 (e)      Costs and Expenses.  Debtor will upon demand pay to
         Secured Party the amount of any and all costs and expenses (including
         without limitation, reasonable attorneys' fees and expenses), which
         Secured Party may incur in connection with (i) the transactions which
         give rise to the Loan Documents, (ii) the preparation of this
         Agreement and the perfection and preservation of the security
         interests granted under the Loan Documents, (iii) the administration
         of the Loan Documents, (iv) the custody, preservation, use or
         operation of, or the sale of, collection from, or other realization
         upon, the Collateral, (v) the exercise or enforcement of any of the
         rights of Secured Party under the Loan Documents, or (vi) the failure
         by Debtor to perform or observe any of the provisions hereof.

                 (F)      GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY
         AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS AND
         APPLICABLE FEDERAL LAWS, EXCEPT TO THE EXTENT PERFECTION AND THE
         EFFECT OF PERFECTION OR NON-PERFECTION OF THE SECURITY INTEREST
         GRANTED HEREUNDER, IN RESPECT OF ANY PARTICULAR COLLATERAL, ARE
         GOVERNED BY THE LAWS OF A JURISDICTION OTHER THAN THE STATE OF TEXAS.

                 (g)      Venue.  This Agreement has been entered into in the
         county in Texas where Secured Party's address for notice purposes is
         located, and it shall be performable for all purposes in such county.
         Courts within the State of Texas shall have jurisdiction over any and
         all disputes arising under or pertaining to this Agreement and venue
         for any such disputes shall be in the county or judicial district
         where this Agreement has been executed and delivered.

                 (h)      Severability.  If any provision of this Agreement is
         held by a court of competent jurisdiction to be illegal, invalid or
         unenforceable under present or future laws, such provision shall be
         fully severable, shall not impair or invalidate the remainder of this
         Agreement and the effect thereof shall be confined to the provision
         held to be illegal, invalid or unenforceable.

                 (i)      No Obligation.  Nothing contained herein shall be
         construed as an obligation on the part of Secured Party to extend or
         continue to extend credit to Debtor.

                 (j)      Notices.  All notices, requests, demands or other
         communications required or permitted to be given pursuant to this
         Agreement shall be in writing and given by (i) personal delivery, (ii)
         expedited delivery service with proof of delivery, or (iii) United
         States mail, postage prepaid, registered or certified mail, return
         receipt requested, sent to the intended addressee at the address set
         forth on the signature page hereof or to such different address as the





                                      -19-
   20
         addressee shall have designated by written notice sent pursuant to the
         terms hereof and shall be deemed to have been received either, in the
         case of personal delivery, at the time of personal delivery, in the
         case of expedited delivery service, as of the date of first attempted
         delivery at the address and in the manner provided herein, or in the
         case of mail, upon deposit in a depository receptacle under the care
         and custody of the United States Postal Service.  Either party shall
         have the right to change its address for notice hereunder to any other
         location within the continental United States by notice to the other
         party of such new address at least thirty (30) days prior to the
         effective date of such new address.

                 (k)      Binding Effect and Assignment.  This Agreement (i)
         creates a continuing security interest in the Collateral, (ii) shall
         be binding on Debtor and the heirs, executors, administrators,
         personal representatives, successors and assigns of Debtor, and (iii)
         shall inure to the benefit of Secured Party and its successors and
         assigns.  Without limiting the generality of the foregoing, Secured
         Party may pledge, assign or otherwise transfer the Indebtedness and
         its rights under this Agreement and any of the other Loan Documents to
         any other party.  Debtor's rights and obligations hereunder may not be
         assigned or otherwise transferred without the prior written consent of
         Secured Party.

                 (l)      Termination.  It is contemplated by the parties
         hereto that from time to time there may be no outstanding
         Indebtedness, but notwithstanding such occurrences, this Agreement
         shall remain valid and shall be in full force and effect as to
         subsequent outstanding Indebtedness.  Upon (i) the satisfaction in
         full of the Indebtedness, (ii) the termination or expiration of any
         commitment of Secured Party to extend credit to Debtor, (iii) written
         request for the termination hereof delivered by Debtor to Secured
         Party, and (iv) written release or termination delivered by Secured
         Party to Debtor, this Agreement and the security interests created
         hereby shall terminate.  Upon termination of this Agreement and
         Debtor's written request, Secured Party will, at Debtor's sole cost
         and expense, return to Debtor such of the Collateral as shall not have
         been sold or otherwise disposed of or applied pursuant to the terms
         hereof and execute and deliver to Debtor such documents as Debtor
         shall reasonably request to evidence such termination.

                 (m)      Cumulative Rights.  All rights and remedies of
         Secured Party hereunder are cumulative of each other and of every
         other right or remedy which Secured Party may otherwise have at law or
         in equity or under any of the other Loan Documents, and the exercise
         of one or more of such rights or





                                      -20-
   21
         remedies shall not prejudice or impair the concurrent or subsequent
         exercise of any other rights or remedies.

                 (n)      Gender and Number.  Within this Agreement, words of
         any gender shall be held and construed to include the other gender,
         and words in the singular number shall be held and construed to
         include the plural and words in the plural number shall be held and
         construed to include the singular, unless in each instance the context
         requires otherwise.

                 (o)      Descriptive Headings.  The headings in this Agreement
         are for convenience only and shall in no way enlarge, limit or define
         the scope or meaning of the various and several provisions hereof.

                 (p)      First Lien; No Merger.  Notwithstanding anything to
         the contrary contained herein, the liens created by this Security
         Agreement are junior, second and inferior to the liens against the
         Collateral described in that certain Security Agreement from Debtor in
         favor of Secured Party and Banc One Leasing Corporation (collectively,
         the secured party thereunder), executed by Debtor as of January 31,
         1996 (the "Bank One First Lien").  Neither Debtor nor Secured Party
         intend that there be, and there shall not in any event be, a merger of
         any of the liens created by this Agreement with the title, any other
         lien or other interest of Secured Party in the Collateral by virtue of
         the Bank One First Lien or any of the Loan Documents (as defined in
         that certain Letter Loan Agreement dated as of January 31, 1996
         entered into by and among Debtor, Secured Party, and Banc One Leasing
         Corporation), and the parties hereto expressly provide that each such
         interest in any lien created hereby on one hand and any other title,
         lien or other interest on the other are and remain at all times
         SEPARATE and DISTINCT.

         EXECUTED as of the date first written above.

                                            DEBTOR:
                                            ------ 
Debtor's Address:                           
- ----------------                            
                                            MITCHAM INDUSTRIES, INC.,
                                            a Texas corporation
   
P. O. Box 1175                              
Huntsville, Texas                           
  77342-1175                                By: /s/ BILLY F. MITCHAM, JR.
                                                -------------------------------
                                            Billy F. Mitcham, Jr., President
    


Secured Party's Address:
- ----------------------- 
Bank One, Texas, N.A.
910 Travis
Houston, Harris County, Texas 77002
Attn:  Walter F. Rodee, III, Vice President





                                      -21-