<DESCRIPTION>EXHIBIT 10.23

<TEXT>



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                                 LEASE AGREEMENT



                                     Between



                               INPUT/OUTPUT, INC.



                                       AND



                                GEOKINETICS INC.







                              Dated October 1, 1999





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                                TABLE OF CONTENTS



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                                                                             PAGE

<S>               <C>                                                        <C>

SECTION 1.        DEFINITIONS.................................................1



SECTION 2.        LEASE.......................................................1



SECTION 3.        CERTAIN COSTS...............................................1



SECTION 4.        REPRESENTATIONS AND WARRANTIES..............................1



SECTION 5.        FINANCIAL AND OTHER REPORTS OF LESSEE.......................3



SECTION 6.        TERM AND RENT...............................................4

         Section 6.1.  Lease Term.............................................4

         Section 6.2.  Basic Rent.............................................4

         Section 6.3.  Supplemental Rent......................................4

         Section 6.4.  Manner of Payments.....................................4

         Section 6.5.  Sales Tax..............................................5



SECTION 7.        OWNERSHIP AND MARKING OF EQUIPMENT; PERSONAL PROPERTY.......5

         Section 7.1.  Retention of Title.....................................5

         Section 7.2.  Insignia...............................................5

         Section 7.3.  Personal Property......................................5



SECTION 8.        DISCLAIMER OF WARRANTIES....................................5



SECTION 9.        RETURN OF EQUIPMENT.........................................6

         Section 9.1.  Return of Equipment....................................6

         Section 9.2.  Condition of Units.....................................7



SECTION 10.       LIENS.......................................................8



SECTION 11.       MAINTENANCE AND OPERATION; COMPLIANCE WITH LAWS; SUBLEASES..8

         Section 11.1.  Maintenance and Operation.............................8

         Section 11.2.  Compliance with Laws, etc.............................8

         Section 11.3.  Sublease..............................................9



SECTION 12.       MODIFICATIONS AND REPLACEMENTS..............................9

         Section 12.1.  Required Modifications................................9

         Section 12.2.  Optional Modifications................................9

         Section 12.3.  Removal of Property, Replacements....................10







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SECTION 13.       LOSS, DESTRUCTION OR REQUISITION...........................10

         Section 13.1.  Event of Loss........................................10

         Section 13.2.  Replacement upon Event of Loss.......................10

         Section 13.3.  Replacement of Unit..................................10

         Section 13.4.  Eminent Domain.......................................11



SECTION 14.       INSURANCE..................................................11

         Section 14.1.  Insurance Coverage...................................11

         Section 14.2.  Certificates and Policies............................11

         Section 14.3.  Additional Insurance.................................12



SECTION 15.       INSPECTION.................................................12



SECTION 16.       LEASE EVENTS OF DEFAULT....................................12



SECTION 17.       REMEDIES AND CERTAIN COVENANTS.............................13

         Section 17.1. Remedies..............................................13

         Section 17.2. Cumulative Remedies...................................15

         Section 17.3. No Waiver.............................................16

         Section 17.4. Notice of Lease Default...............................16

         Section 17.5. Lessee's Duty to Return Equipment Upon Default........16

         Section 17.6. Specific Performance; Lessor Appointed Lessee's Agent.16



SECTION 18.       LESSEE'S INDEMNITIES.......................................16

         Section 18.1.  Taxes................................................16

         Section 18.2.  General Indemnification and Waiver of Certain Claims.17



SECTION 19.       FURTHER ASSURANCES.........................................20



SECTION 20.       LESSOR'S RIGHT TO PERFORM..................................20



SECTION 21.       ASSIGNMENT.................................................20

         Section 21.1.  Assignment by Lessor.................................20

         Section 21.2.  Assignment by Lessee.................................21

         Section 21.3.  Sublessee's Performance and Rights...................21



SECTION 22.       NET LEASE, ETC.............................................21



SECTION 23.       NOTICES....................................................22



SECTION 24.       PURCHASE OPTIONS...........................................23

         Section 24.1.  Election to Retain or Return Equipment at End of

                        Basic or Term........................................23

         Section 24.2.  Purchase Option......................................23

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