SEITEL INC
10-Q, 1999-11-15
OIL & GAS FIELD EXPLORATION SERVICES
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                    FORM 10-Q


- -----
| X |     QUARTERLY  REPORT  PURSUANT  TO SECTION 13 OR 15(d) OF THE  SECURITIES
- -----     EXCHANGE ACT OF 1934

          For the quarterly period ended September 30, 1999
                                         ------------------
                OR

- -----
|   |     TRANSITION  REPORT  PURSUANT TO SECTION 13 OR 15(d) OF THE  SECURITIES
- -----     EXCHANGE ACT OF 1934
          For the transition period        to       .
                                    ------    ------
          Commission File Number 0-14488
                                 -------


                                  SEITEL, INC.
               (Exact name of registrant as specified in charter)

           DELAWARE                                             76-0025431
           --------                                             ----------
(State or other jurisdiction of                                (IRS Employer
incorporation or organization)                            Identification Number)

     50 Briar Hollow Lane
   West Building, 7th Floor
        HOUSTON, TEXAS                                             77027
        --------------                                             -----
     (Address of principal                                      (Zip Code)
      executive offices)

                                 (713) 881-8900
                                 --------------
              (Registrant's telephone number, including area code)

                                 NOT APPLICABLE
                                 --------------
               Former name, former address and former fiscal year,
                          if changed since last report.

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                              -----                  -----
                       Yes    | X |             No   |   |
                              -----                  -----

As of November 12, 1999 there were  24,285,795  shares of the  Company's  common
stock, par value $.01 per share, outstanding.


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

<PAGE>
                                      INDEX



PART I.  FINANCIAL INFORMATION                                             Page
                                                                          ------

         Item 1.     Financial Statements

         Consolidated Balance Sheets as of
         September 30, 1999 (Unaudited) and December 31, 1998..............  3

         Consolidated Statements of Operations (Unaudited) for the
         Three Months Ended September 30, 1999 and 1998....................  4

         Consolidated Statements of Operations (Unaudited) for the
         Nine Months Ended September 30, 1999 and 1998.....................  5

         Consolidated Statements of Stockholders' Equity (Unaudited)
         for the Nine Months Ended September 30, 1999......................  6

         Consolidated Statements of Cash Flows (Unaudited) for the
         Nine Months Ended September 30, 1999 and 1998.....................  7

         Notes to Consolidated Interim Financial Statements (Unaudited)....  9

         Item 2.     Management's Discussion and Analysis of Financial
         Condition and Results of Operations............................... 12

         Item 3.     Quantitative and Qualitative Disclosures
         about Market Risk................................................. 17

PART II. OTHER INFORMATION................................................. 17

<PAGE>



                         PART I - FINANCIAL INFORMATION


Item 1.    FINANCIAL STATEMENTS
           --------------------

SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts)
<TABLE>
<CAPTION>
                                                          (Unaudited)
                                                         September 30,      December 31,
                                                             1999              1998
                                                           ---------         ---------
ASSETS
<S>                                                        <C>               <C>
   Cash and equivalents                                    $   5,386         $   3,161
   Receivables
      Trade, net of allowance                                 54,771            59,244
      Notes and other                                            509               581
   Net data bank                                             323,325           262,950
   Net oil and gas properties                                148,612           148,977
   Net other property and equipment                            2,541             2,294
   Investment in marketable securities                         1,566                 -
   Investment in affiliate                                         -            15,544
   Prepaid expenses, deferred charges and other assets         4,786             3,016
                                                           ---------         ---------
TOTAL ASSETS                                               $ 541,496         $ 495,767
                                                           =========         =========

LIABILITIES AND STOCKHOLDERS' EQUITY

   Accounts payable and accrued liabilities                $  42,494         $  71,555
   Income taxes payable                                          434             1,056
   Debt
      Senior Notes                                           203,000            65,000
      Line of Credit                                          19,000            85,500
      Term Loans                                                  66               172
   Obligations under capital leases                               28                18
   Contingent payables                                           274               274
   Deferred income taxes                                      30,125            28,039
   Deferred revenue                                            1,463             6,566
                                                           ---------         ---------
TOTAL LIABILITIES                                            296,884           258,180
                                                           ---------         ---------

CONTINGENCIES AND COMMITMENTS

STOCKHOLDERS' EQUITY
   Preferred stock, par value $.01 per share; authorized
      5,000,000 shares; none issued                                -                 -
   Common stock, par value $.01 per share; authorized
      50,000,000 shares; issued and outstanding
      24,285,795 and 23,804,508 at September 30, 1999
      and December 31, 1998, respectively                        243               238
   Additional paid-in capital                                147,839           141,826
   Retained earnings                                         107,186           107,102
   Treasury stock, 175,818 shares at cost at September
      30, 1999 and December 31, 1998                          (2,977)           (2,977)
   Notes receivable from officers and employees               (6,986)           (8,651)
   Accumulated other comprehensive income (loss)                (693)               49
                                                           ---------         ---------
TOTAL STOCKHOLDERS' EQUITY                                   244,612           237,587
                                                           ---------         ---------

TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                 $ 541,496         $ 495,767
                                                           =========         =========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.


<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
(In thousands, except per share amounts)
<TABLE>
<CAPTION>

                                                               Three Months Ended
                                                                  September 30,
                                                           ---------------------------
                                                             1999               1998
                                                           ---------         ---------

<S>                                                        <C>               <C>
REVENUE                                                    $  24,617         $  38,332

EXPENSES:
   Depreciation, depletion and amortization                   11,792            19,551
   Cost of sales                                               1,488             1,175
   Selling, general and administrative expenses                6,549             6,453
                                                           ---------         ---------
                                                              19,829            27,179
                                                           ---------         ---------

INCOME FROM OPERATIONS                                         4,788            11,153

Interest expense, net                                         (3,114)           (1,516)
Equity in earnings of affiliate                                    -               344
                                                           ---------         ---------

Income before provision for income taxes                       1,674             9,981

Provision for income taxes                                       850             3,693
                                                           ---------         ---------

NET INCOME                                                 $     824         $   6,288
                                                           =========         =========

Earnings per share:
   Basic                                                   $     .03         $     .28
                                                           =========         =========
   Diluted                                                 $     .03         $     .28
                                                           =========         =========

Weighted average number of common and common
   equivalent shares:

   Basic                                                      24,110            22,634
                                                           =========         =========
   Diluted                                                    24,489            22,818
                                                           =========         =========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.




<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
(In thousands, except per share amounts)
<TABLE>
<CAPTION>

                                                                 Nine Months Ended
                                                                   September 30,
                                                           ---------------------------
                                                              1999              1998
                                                           ---------         ---------

<S>                                                        <C>               <C>
REVENUE                                                    $  96,625         $ 106,235

EXPENSES:
   Depreciation, depletion and amortization                   44,579            52,433
   Cost of sales                                               3,967             3,654
   Selling, general and administrative expenses               21,031            18,875
                                                           ---------         ---------
                                                              69,577            74,962
                                                           ---------         ---------

INCOME FROM OPERATIONS                                        27,048            31,273

Interest expense, net                                         (8,137)           (3,913)
Equity in earnings (loss) of affiliate                           (91)              469
Impairment due to dividend distribution of
   affiliate stock                                            (7,794)               --
                                                           ---------         ---------

Income before provision for income taxes                      11,026            27,829

Provision for income taxes                                     4,577            10,307
                                                           ---------         ---------

NET INCOME                                                 $   6,449         $  17,522
                                                           =========         =========

Earnings per share:
   Basic                                                   $     .27         $     .78
                                                           =========         =========
   Diluted                                                 $     .26         $     .76
                                                           =========         =========

Weighted average number of common and
   common equivalent shares:
   Basic                                                      23,850            22,593
                                                           =========         =========
   Diluted                                                    24,361            22,960
                                                           =========         =========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.

<PAGE>

SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
(In thousands, except share amounts)

<TABLE>
<CAPTION>
                                                                                                     Notes
                                                                                                  Receivable  Accumulated
                                        Common Stock       Additional            Treasury Stock      from        Other
                         Comprehensive------------------    Paid-In   Retained   ---------------  Officers &  Comprehensive
                             Income     Shares    Amount    Capital   Earnings   Shares   Amount   Employees    Income
                            --------  ----------  ------    -------    -------   -------  ------   --------   ----------
<S>                        <C>        <C>        <C>       <C>        <C>       <C>       <C>     <C>        <C>

Balance, December 31, 1997            22,548,408 $   225   $128,406   $ 82,742  (175,818)$(2,977) $  (1,109) $       (14)

   Net proceeds from
     issuance
     of common stock                     106,067       1        983          -         -       -          -            -
   Tax reduction from
     exercise
     of stock options                          -       -        344          -         -       -          -            -
   Sale of common stock to
     officers and employees              794,300       8      8,183          -         -       -     (8,191)           -
   Acquisition of oil and
     gas properties                      355,733       4      3,910          -         -       -          -            -
   Payments received on
     notes receivable from
     officers and employees                    -       -          -          -         -       -        649            -
   Net income              $  24,360           -       -          -     24,360         -       -          -            -
   Foreign currency
     translation
     adjustments net of
     income tax expense
     of $67                       63           -       -          -          -         -       -          -           63
                            --------
   Comprehensive income    $  24,423
                            ========  ----------  ------    -------    -------   -------  ------   --------   ----------

Balance, December 31, 1998            23,804,508     238    141,826    107,102  (175,818) (2,977)    (8,651)          49

   Net proceeds from
     issuance
     of common stock                     481,287       5      5,134          -         -       -          -            -
   Tax reduction from
     exercise
     of stock options                          -       -        879          -         -       -          -            -
   Payments received on
     notes receivable from
     officers and employees                    -       -          -          -         -       -      1,665            -
   Distribution of Eagle
     Geophysical, Inc.
     shares                                    -       -          -     (6,365)        -       -          -            -
   Net income              $   6,449           -       -          -      6,449         -       -          -            -
   Foreign currency
     translation
     adjustments net of
     income tax expense
     of $17                        12           -       -          -          -         -       -          -           12
   Unrealized loss on
     marketable securities
     net of income tax
     benefit of $754            (754)          -       -          -          -         -       -          -         (754)
                            --------
   Comprehensive income    $   5,707
                            ========  ----------  ------    -------    -------   -------  ------   --------   ----------
Balance, September 30, 1999
     (unaudited)                      24,285,795 $   243   $147,839   $107,186  (175,818)$(2,977) $  (6,986) $      (693)
                                      ==========  ======    =======    =======   =======  ======   ========   ==========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.
<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
(In thousands)
<TABLE>
<CAPTION>
                                                                Nine Months Ended
                                                                  September 30,
                                                           ---------------------------
                                                             1999               1998
                                                           ---------         ---------
<S>                                                        <C>               <C>
Cash flows from operating activities:
   Cash received from customers                            $  89,473         $ 108,661
   Cash paid to suppliers and employees                      (26,631)          (17,284)
   Interest paid                                              (6,215)           (3,320)
   Interest received                                             321               298
   Income taxes paid                                          (1,553)           (2,535)
                                                            --------          --------
      Net cash provided by operating activities               55,395            85,820
                                                            --------          --------

Cash flows from investing activities:
   Cash invested in seismic data                            (111,636)         (100,429)
   Cash invested in oil and gas properties                   (25,440)          (31,586)
   Net proceeds from sale of oil and gas properties           11,657                 -
   Cash paid to acquire property and equipment                  (920)             (681)
   Cash from disposal of property and equipment                    -                17
   Investment in marketable securities                        (3,043)                -
                                                            --------          --------
      Net cash used in investing activities                 (129,382)         (132,679)
                                                            --------          --------

Cash flows from financing activities:
   Borrowings under line of credit agreements                 63,908            69,207
   Principal payments under line of credit                  (130,408)          (24,207)
   Principal payments on term loans                             (106)             (262)
   Principal payments on capital lease obligations               (23)              (59)
   Proceeds from issuance of senior notes                    138,000                 -
   Proceeds from issuance of common stock                      5,175             1,015
   Costs of debt and equity transactions                      (2,038)              (66)
   Payments on receivables from officers and employees         1,665                76
                                                            --------          --------
      Net cash provided by financing activities               76,173            45,704
                                                            --------          --------

Effect of exchange rate changes                                   39                79
                                                            --------          --------

Net increase (decrease) in cash and equivalents                2,225            (1,076)

Cash and cash equivalents at beginning of period               3,161             4,881
                                                            --------          --------

Cash and cash equivalents at end of period                 $   5,386         $   3,805
                                                            ========          ========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.



<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited), continued
(In thousands)
<TABLE>
<CAPTION>
                                                                Nine Months Ended
                                                                  September 30,
                                                           ---------------------------
                                                             1999               1998
                                                           ---------         ---------

<S>                                                        <C>               <C>
Reconciliation of net income to net cash provided by
   operating activities:
Net income                                                 $   6,449         $  17,522
Adjustments to reconcile net income to net cash
   provided by operating activities:
   Impairment due to dividend distribution of
   affiliate stock                                             7,794                 -
   Equity in loss (earnings) of affiliate                         91              (469)
   Depreciation, depletion and amortization                   44,579            52,432
   Deferred income tax provision                               2,799             4,935
   Non-cash sales                                             (6,522)           (1,140)
   Gain on sale of property and equipment                          -               (13)
   Decrease in receivables                                     4,545             3,623
   Decrease (increase) in other assets                           (40)              347
   Increase (decrease) in other liabilities                   (4,300)            8,583
                                                            --------         ---------
      Total adjustments                                       48,946            68,298
                                                            --------         ---------

Net cash provided by operating activities                  $  55,395         $  85,820
                                                            ========         =========

Supplemental schedule of non-cash investing and
   financing activities:

   Dividend payable of affiliate stock                     $   6,365         $       -
                                                            ========         =========
   Capital lease obligations incurred                      $      33         $       -
                                                            ========         =========
</TABLE>

                     The accompanying notes are an integral
                part of these consolidated financial statements.

<PAGE>


SEITEL, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED INTERIM FINANCIAL STATEMENTS (Unaudited)
September 30, 1999

NOTE A-BASIS OF PRESENTATION

     The  accompanying  unaudited  financial  statements  have been  prepared in
accordance with generally accepted  accounting  principles for interim financial
information and with the  instructions of Regulation S-X.  Accordingly,  they do
not include all of the  information  and notes  required by  generally  accepted
accounting  principles  for  complete  financial  statements.  In the opinion of
management, all adjustments (consisting of normal recurring accruals) considered
necessary for a fair presentation have been included.  Certain reclassifications
have been  made to the  amounts  in the prior  year's  financial  statements  to
conform to the  current  year's  presentation.  Operating  results  for the nine
months ended  September 30, 1999 are not  necessarily  indicative of the results
that  may be  expected  for the year  ending  December  31,  1999.  For  further
information,  refer to the financial  statements  and notes thereto for the year
ended December 31, 1998  contained in the Company's  Annual Report filed on Form
10-K with the Securities and Exchange Commission.

     The Company  accounts for its  marketable  equity  securities in accordance
with Statement of Financial Accounting Standards (SFAS) No. 115, "Accounting for
Certain  Investments in Debt and Equity Securities."  Management  determines the
appropriate  classification of marketable securities at the time of purchase and
reevaluates   such  designation  at  each  balance  sheet  date.  The  Company's
marketable securities are categorized as  available-for-sale  and are carried at
fair value, with unrealized holding gains and losses, net of taxes, reflected in
accumulated other  comprehensive  income included in stockholders'  equity until
realized.  For the  purpose of  computing  realized  gains and  losses,  cost is
identified on a specific identification basis.

NOTE B-EARNINGS PER SHARE

     In accordance  with SFAS No. 128,  "Earnings per Share," basic earnings per
share  is  computed  based  on the  weighted  average  shares  of  common  stock
outstanding during the periods.  Diluted earnings per share is computed based on
the weighted  average shares of common stock plus the assumed issuance of common
stock for all potentially dilutive  securities.  Earnings per share computations
to  reconcile  basic and diluted net income for the three and nine months  ended
September 30, 1999 and 1998 consist of the  following  (in thousands  except per
share amounts):
<TABLE>
<CAPTION>

                                                     Three Months Ended                   Nine Months Ended
                                                       September 30,                        September 30,
                                                 -------------------------          -------------------------
                                                   1999            1998                1999           1998
                                                 ---------      ----------          ----------      ---------

<S>                                            <C>            <C>                 <C>             <C>
Net income                                     $       824    $      6,288        $      6,449    $    17,522
                                                 =========      ==========          ==========      =========

Basic weighted average shares                       24,110          22,634              23,850         22,593
Effect of dilutive securities: (1)<F1>
   Options and warrants                                379             184                 511            367
                                                 ---------      ----------          ----------      ---------
Diluted weighted average shares                     24,489          22,818              24,361         22,960
                                                 =========      ==========          ==========      =========
Per share income:
   Basic                                       $       .03    $        .28        $        .27    $       .78
   Diluted                                     $       .03    $        .28        $        .26    $       .76
- -------------------
<FN>
(1)<F1>  During the third  quarter of 1999 and 1998 and the first nine months of
         1999 and 1998,  a weighted  average  number of options and  warrants to
         purchase 4,543,000, 3,873,000, 4,072,000 and 2,563,000 shares of common
         stock were  outstanding,  respectively,  but were not  included  in the
         computation of diluted per share income  because their exercise  prices
         were greater than the average market price of the common shares.
</FN>
</TABLE>


<PAGE>


NOTE C-DATA BANK

     Costs incurred in the creation of proprietary  seismic data,  including the
direct and incremental costs of Company personnel engaged in project  management
and design,  are capitalized.  Substantially all (greater than 87%) of the costs
incurred to develop the  Company's  data bank have been for programs  created by
the Company.  The Company uses the income  forecast method to amortize the costs
of seismic data programs it creates.  Under the income forecast method,  seismic
data costs are amortized in the proportion  that revenue for a period relates to
management's  estimate of ultimate  revenues.  Since  inception,  management has
established guidelines regarding its annual charge for amortization. Under these
guidelines,  seismic data created by the Company is amortized in a set period of
time based on historical  experience with both the timing and amount of revenue.
Management  estimates  that 90% of the costs incurred in the creation of seismic
data is amortized  within five years of such data becoming  available for resale
for  two-dimensional  seismic data and within seven years of such data  becoming
available for resale for  three-dimensional  seismic data. If anticipated  sales
fall below the benchmark  guidelines,  amortization is accelerated.  The Company
also purchases existing seismic data programs from other companies. The costs of
purchased seismic data programs are generally amortized on a straight-line basis
over ten years; however, the costs of a significant purchase (greater than 5% of
the net book value of the data  bank),  are  amortized  using the greater of the
income forecast  method or ten-year  straight-line  method.  As of September 30,
1999,  almost  all (96%) of the net costs of the  Company's  data bank are fully
amortized within 10 years from when such data becomes available for resale.

     In certain cases,  the Company grants seismic licenses to third parties for
data to be used in their  operations  (not for resale) in exchange for exclusive
ownership of seismic data from the third party. The Company  recognizes  revenue
for the licenses  granted and records a data library  asset for the seismic data
acquired. These transactions are accounted for as non-monetary exchanges and are
valued at the fair market  value of such  licenses  based on values  realized in
cash  transactions with other third parties for similar seismic data. During the
first  nine  months  of 1999,  the  Company  licensed  seismic  data  valued  at
$6,522,000 in exchange for the purchase of seismic data for its library.

NOTE D-OIL AND GAS PROPERTIES

     The  Company  accounts  for  its oil and  gas  exploration  and  production
activities  using the full-cost  method of  accounting.  Under this method,  all
costs  associated with  acquisition,  exploration and development of oil and gas
reserves,  including  directly related overhead costs and interest costs related
to its unevaluated properties and certain properties under development which are
not  currently  being  amortized,  are  capitalized.  For the nine months  ended
September 30, 1999 and 1998, general and administrative  costs of $1,474,000 and
$1,276,000,  respectively,  have been capitalized to oil and gas properties. For
the nine months ended September 30, 1999 and 1998,  interest costs of $2,343,000
and $1,790,000, respectively, have been capitalized to oil and gas properties.

     On July 26, 1999,  the Company sold its 18.75%  working  interest in 11 oil
and gas wells,  one salt water disposal well and  approximately  16,000 acres of
leasehold and options to lease for net proceeds of approximately $11.7 million.

     The Company has announced its intentions to sell  approximately  90% of its
ownership in DDD Energy, Inc. ("DDD Energy"), a wholly-owned subsidiary, through
an initial public  offering  expected to close during the first quarter of 2000.
In the  event  the sale is not  completed,  DDD  Energy  will  continue  to be a
wholly-owned  subsidiary of the Company.  The Company does not anticipate a loss
will be incurred on this  transaction.  Proceeds from the proposed offering will
be used to reduce debt and provide funds for seismic data library additions.

NOTE E-INVESTMENT IN EAGLE GEOPHYSICAL, INC.

     On April 22, 1999, the Board of Directors of Seitel,  Inc.  declared to its
common  stockholders a dividend consisting of the 1,520,000 shares of the common
stock of Eagle Geophysical,  Inc.  ("Eagle") owned by the Company.  The dividend
was declared at the rate of approximately 0.064 shares of Eagle common stock for
each share of Seitel, Inc. common stock owned as of the close of business on the
record date of May 18, 1999.

         The fair market  value of the common stock of Eagle held by the Company
on the date this dividend was declared was lower than the carrying  value of the
stock on the Company's  balance  sheet;  therefore,  a non-cash,  non-recurring,
pre-tax impairment, net of bonus effect, of $7,794,000 was recorded for the nine
months ended September 30, 1999.


<PAGE>

NOTE F-INDUSTRY SEGMENTS

         SFAS NO. 131,  "Disclosures About Segments of an Enterprise and Related
Information,"  established  standards for reporting  information about operating
segments in annual  financial  statements and requires  selected  information in
interim financial reports. Selected financial information for the three and nine
months ended September 30, 1999 and 1998 is as follows (in thousands):
<TABLE>
<CAPTION>

                                                                                        Exploration
                                                                                            and                    Total
                                                                  Seismic                Production               Segments
                                                                ------------            -------------           -------------
Three months ended September 30, 1999
- -------------------------------------
<S>                                                           <C>                     <C>                     <C>
Revenue from external purchasers                              $      19,804           $        4,813          $       24,617
Depreciation, depletion
  and amortization                                                    9,300                    2,188                  11,488
Cost of sales                                                            96                    1,392                   1,488
Segment operating income                                             10,408                    1,233                  11,641
Capital expenditures (a)<F1>                                         18,795                    3,845                  22,640
Assets                                                              379,784                  154,867                 534,651

Three months ended September 30, 1998
- -------------------------------------
Revenue from external purchasers                              $      33,714           $        4,618          $       38,332
Depreciation, depletion
  and amortization                                                   16,009                    3,323                  19,332
Cost of sales                                                            39                    1,136                   1,175
Segment operating income                                             17,666                      159                  17,825
Capital expenditures (a)<F1>                                         43,509                   12,179                  55,688
Assets (b)<F2>                                                      317,292                  156,623                 473,915

Nine months ended September 30, 1999
- ------------------------------------
Revenue from external purchasers                              $      83,266           $       13,359          $       96,625
Depreciation, depletion
  and amortization                                                   37,380                    6,326                  43,706
Cost of sales                                                           227                    3,740                   3,967
Segment operating income                                             45,659                    3,293                  48,952
Capital expenditures (a)<F1>                                         97,998                   17,970                 115,968
Assets                                                              379,784                  154,867                 534,651

Nine months ended September 30, 1998
- ------------------------------------
Revenue from external purchasers                              $      91,807           $       14,428          $      106,235
Depreciation, depletion
  and amortization                                                   42,085                    9,697                  51,782
Cost of sales                                                           151                    3,503                   3,654
Segment operating income                                             49,571                    1,228                  50,799
Capital expenditures (a)<F1>                                        106,841                   33,761                 140,602
Assets (b)<F2>                                                      317,292                  156,623                 473,915

<FN>
(a)<F1>  Includes other ancillary equipment.
(b)<F2>  Balance as of December 31, 1998.

</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
                                                              Three Months Ended                    Nine Months Ended
                                                                September 30,                         September 30,
                                                        -----------------------------       -----------------------------
                                                            1999             1998              1999              1998
                                                        ------------      -----------       -----------      ------------
<S>                                                   <C>               <C>               <C>              <C>
Income from continuing operations before income taxes:
     Total reportable segment operating income        $       11,641    $      17,825     $      48,952    $       50,799
     Selling general and administrative expense               (6,549)          (6,453)          (21,031)          (18,875)
     Interest expense, net                                    (3,114)          (1,516)           (8,137)           (3,913)
     Equity in earnings (loss) of affiliate                        -              344               (91)              469
     Impairment due to dividend distribution of
       affiliate stock                                             -                -            (7,794)                -
     Eliminations and other                                     (304)            (219)             (873)             (651)
                                                        ------------      ------------      -----------      ------------
     Income from continuing operations before
       income taxes                                   $        1,674    $       9,981     $      11,026    $       27,829
                                                        ============      ===========       ===========      ============
</TABLE>


Item 2.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
           AND RESULTS OF OPERATIONS
           -----------------------------------------------------------

OVERVIEW

     The  Company's  income from core  seismic  marketing  and  exploration  and
production operations was $824,000 for the third quarter of 1999 and $11,574,000
for the nine months ended  September 30, 1999 as compared to $6,064,000  for the
third quarter of 1998 and  $17,216,000  for the nine months ended  September 30,
1998.  Additionally,  in the first nine months of 1999,  the Company  recorded a
non-cash,  non-operating  loss on the dividend  distribution  of affiliate stock
totaling  $5,066,000,  net of tax,  along with  equity in loss of  affiliate  of
$59,000, net of tax, bringing net income for the nine months ended September 30,
1999 to  $6,449,000.  In the third  quarter and first nine  months of 1998,  the
Company  recorded  its equity in the  earnings  of  affiliate  of  $224,000  and
$306,000,  net of tax,  respectively,  bringing third quarter 1998 net income to
$6,288,000 and the first nine months of 1998 net income to $17,522,000.

RESULTS OF OPERATIONS

     Total revenue was $24,617,000 and $38,332,000 in the third quarters of 1999
and 1998,  respectively,  and  $96,625,000  and  $106,235,000  in the first nine
months of 1999 and 1998,  respectively.  Revenue  primarily  consists of revenue
generated from the marketing of seismic data and oil and gas production.

     Revenue from the  marketing of seismic  data was  $19,804,000  in the third
quarter of 1999  compared to  $33,714,000  in the third  quarter of 1998 and was
$83,266,000  in the first nine  months of 1999  compared to  $91,807,000  in the
first  nine  months of 1998.  During  the third  quarter  of 1999,  the  Company
continued to focus on client  interest in its existing  data library  versus the
new data  creation  market.  The Company's  existing data library  available for
resale continued to increase significantly through the first quarter of 1999 due
to the  creation  of seismic  data and the  purchase  of the Amoco  Canada  data
library in February  1999.  As a result,  revenue from the licensing of existing
data  increased  between the  periods;  however,  such  increase was offset by a
decrease in revenue from new data creation.  Because of the current  emphasis on
marketing  existing data, the Company reduced the amount of expenditures made in
creating  new  seismic  data in the  second  and third  quarters  of 1999  which
resulted in a decrease in revenue associated with the creation of new data.

     Oil and gas revenue was $4,813,000 in the third quarter of 1999 compared to
$4,618,000  in the third  quarter of 1998.  The  increase  between  periods  was
primarily due to higher prices  received by the Company for both its natural gas
and crude oil production during the third quarter of 1999, partially offset by a
decrease in natural gas  production.  Oil and gas revenue was $13,359,000 in the
first nine months of 1999  compared to  $14,428,000  in the first nine months of
1998.  The  decrease  in oil and gas  revenue  for the  nine  month  period  was
primarily  caused by both lower  natural gas  production  and prices  during the
first nine  months of 1999.  The  decrease  in natural  gas  production  between
periods was primarily due to production  declines  experienced on certain of the
Company's older wells. Additionally, in July 1999, the Company sold its interest
in 11 oil  and gas  wells,  five  of  which  were  producing,  whose  production
partially offset these declines during the first six months of 1999. The Company
anticipates  that wells that came  on-line in the third  quarter of 1999 and new
wells anticipated to come on-line in the fourth quarter of 1999 will offset most

<PAGE>

of this production  decline.  Net volume and price information for the Company's
oil and gas  production for the third quarters and first nine months of 1999 and
1998 are summarized in the following table:
<TABLE>
<CAPTION>

                                                           Quarter Ended                         Nine Months Ended
                                                           September 30,                           September 30,
                                                    ----------------------------            ----------------------------
                                                      1999              1998                  1999              1998
                                                    ----------       -----------            ----------       -----------
<S>                                                   <C>               <C>                   <C>               <C>
Natural gas volumes (mmcf)                            1,150             1,622                 4,226             4,543
Average natural gas price ($/mcf)                 $    2.65        $     2.20             $    2.18        $     2.35
Crude oil/condensate volumes (mbbl)                     101                88                   282               286
Average crude oil/condensate price ($/bbl)        $   16.50        $    11.22             $   13.73        $    12.36
</TABLE>

     Depreciation,  depletion and amortization  consists  primarily of data bank
amortization and depletion of oil and gas properties. Data bank amortization was
$9,300,000  during the third quarter of 1999 compared to $16,009,000  during the
third quarter of 1998 and was  $37,380,000  during the first nine months of 1999
compared  to  $42,085,000  during the first nine  months of 1998.  The amount of
seismic data  amortization  fluctuates  based on the level of seismic  marketing
revenue.  As a percentage  of revenue from  licensing  seismic  data,  data bank
amortization was 48% for the third quarters of 1999 and 1998 and was 46% for the
first nine months of 1999 and 1998. As of September  30, 1999,  almost all (96%)
of the net costs of the Company's data bank are fully amortized  within 10 years
from  when  such data  becomes  available  for  resale.  See Note C for  further
discussion of the Company's seismic data amortization policy.

     Depletion of oil and gas properties was $2,188,000 for the third quarter of
1999 compared to $3,323,000  for the third  quarter of 1998,  which  amounted to
$1.25 and $1.55, respectively, per mcfe of gas produced during such periods. For
the nine months  ended  September  30, 1999 and 1998,  depletion  of oil and gas
properties was $6,326,000 and $9,697,000,  respectively, which amounted to $1.07
and $1.55,  respectively,  per mcfe of gas  produced  during such  periods.  The
decreases  in the  rate are due to the  significant  increase  in the  Company's
proved reserves as of January 1, 1999 as determined by the Company's independent
reserve  engineers  resulting  from both new  discoveries  in 1998 and  positive
revisions to previous  reserve  estimates.  In the third  quarter of 1999,  this
decrease in rate was partially offset as a result of the sale of proved reserves
in connection with the sale of the Company's interest in 11 oil and gas wells in
July 1999.

     Cost of sales consists of expenses  associated  with oil and gas production
and seismic resale support  services.  Oil and gas production  costs amounted to
$1,392,000  or $.79 per mcfe of gas produced and  $3,740,000 or $.63 per mcfe of
gas produced in the third  quarter and first nine months of 1999,  respectively.
This compares to  $1,136,000 or $.53 per mcfe of gas produced and  $3,503,000 or
$.56 per mcfe of gas  produced  in the third  quarter  and first nine  months of
1998, respectively.  The increase in this rate in the third quarter is primarily
due to (1) an  increase  in the per mcfe rate  associated  with lease  operating
expenses as a result of the operating costs remaining  relatively constant while
the  production  declined,  (2) higher  workover  costs  incurred and (3) higher
production  taxes resulting from the higher prices received in the third quarter
of 1999. The increase in this rate for the nine month period is primarily due to
an increase in the per mcfe rate associated  with lease operating  expenses as a
result  of  the  operating  costs  remaining  relatively  while  the  production
declined.

     The Company's selling,  general and administrative expenses were $6,549,000
and  $21,031,000  during  the  third  quarter  and  first  nine  months of 1999,
respectively,  compared to $6,453,000 and  $18,875,000  during the third quarter
and first nine months of 1998,  respectively.  The increase  between  periods is
primarily due to legal and other  non-recurring  expenses  incurred in the third
quarter and first nine months of 1999 and an  increase in costs  resulting  from
the Company's  expansion in Canada.  These increases were partially  offset by a
reduction  of  variable   expenses,   including   commissions   on  revenue  and
compensation tied to pre-tax profits. As a percentage of revenue, total selling,
general and  administrative  expenses were 27% and 22% for the third quarter and
first nine months of 1999,  respectively,  and 17% and 18% for the third quarter
and first nine months of 1998, respectively.

     Net interest expense was $3,114,000 and $8,137,000 in the third quarter and
first nine months of 1999,  respectively,  compared to $1,516,000 and $3,913,000
in the third quarter and first nine months of 1998,  respectively.  The increase
was  primarily  due to the  addition of $138 million of senior notes on February
12, 1999 at an average  interest rate of 7.3% partially offset by lower interest
expense on the  Company's  revolving  line of credit due to lower  amounts being
borrowed.
<PAGE>

     On April 22,  1999,  the Board of  Directors  of  Seitel,  Inc.  declared a
dividend to its common  stockholders  consisting of the 1,520,000  shares of the
common stock of Eagle  Geophysical,  Inc. owned by the Company.  The fair market
value of the common stock of Eagle held by the Company on the date this dividend
was  declared was lower than the  carrying  value of the stock on the  Company's
balance sheet; therefore, a non-cash, non-recurring,  pre-tax impairment, net of
bonus effect, of $7,794,000 was recorded for the nine months ended September 30,
1999.

     The  Company's  effective  income  tax rate  was 51% and 42% for the  third
quarter  and first nine months of 1999,  respectively,  compared to 37% for both
the third  quarter and first nine months of 1998.  The increase in the effective
income tax rate for the third quarter of 1999 was due to the estimated effective
tax rate for the year  increasing  to 38.7% from 37.7% as  estimated at June 30,
1999 as a result  of  Canadian  operations  reflecting  a larger  percentage  of
pre-tax  profits  than  had  been  originally  estimated.  The  increase  in the
effective  income tax rate for the nine months ended  September 30, 1999 was due
to the makeup of the income tax expense  for the  period.  Income tax expense in
the first nine months of 1999 consisted of two items:  (1) income tax expense on
income from core operations at the Company's  estimated annual tax rate of 38.7%
offset  by  (2)  income  tax  benefit  on the  non-recurring  loss  on  dividend
distribution  of  affiliate  stock at the tax rate of 35%.  The net of these two
items  resulted in the higher  effective tax rate.  The Company's  effective tax
rate for the remainder of 1999 is estimated to be approximately 38.7%.

LIQUIDITY AND CAPITAL RESOURCES

     The Company's cash flow from  operating  activities  was  $55,395,000,  and
$85,820,000 for the nine months ended September 30, 1999 and 1998, respectively.
The decrease from 1998 to 1999 was  primarily  due to a decrease in  collections
from customers caused by the Company's reduced level of revenue  associated with
the creation of new data and timing  differences  in payments to  suppliers  and
employees.

     The Company has a $75 million  unsecured  revolving line of credit facility
that matures on March 16, 2001. The facility bears interest at a rate determined
by the ratio of the Company's debt to cash flow from operations. Pursuant to the
interest rate pricing structure, funds can currently be borrowed at LIBOR plus 1
1/2%,  the  bank's  prevailing  prime  rate,  or the  sum of the  Federal  Funds
effective rate for such day plus 1/2%. Certain restrictions exist that limit the
amount of  borrowings  that the  Company  can make  under this  facility.  As of
November 12,  1999,  the balance  outstanding  on the  revolving  line of credit
amounted to $18,000,000 bearing an average interest rate of 6.1875%.

     On December 28, 1995,  the Company  completed a private  placement of three
series  of   unsecured   Senior  Notes   totaling   $75  million.   The  Company
contemporaneously  issued  its Series A Notes and  Series B Notes,  which  total
$52.5 million and bear interest at a fixed rate of 7.17%.  On April 9, 1996, the
Company  issued its Series C Notes,  which total $22.5 million and bear interest
at a fixed rate of 7.48%.  The Series A Notes mature on December  30, 2001,  and
require annual principal  payments of $8.3 million beginning  December 30, 1999.
The  Series B and  Series C Notes  mature on  December  30,  2002,  and  require
combined  annual  principal  payments of $10 million which began on December 30,
1998. Interest on all series of the notes is payable  semi-annually on September
30 and December 30.

     On February 12, 1999,  the Company  completed a private  placement of three
series of unsecured Senior Notes totaling $138 million. The Series D Notes total
$20 million,  bear  interest at a fixed rate of 7.03% and mature on February 15,
2004, with no principal  payments due until  maturity.  The Series E Notes total
$75 million,  bear  interest at a fixed rate of 7.28% and mature on February 15,
2009, with annual  principal  payments of $12.5 million  beginning  February 15,
2004.  The Series F Notes total $43  million,  bear  interest at a fixed rate of
7.43% and mature on February  15,  2009,  with no  principal  payments due until
maturity. Interest on all series of the notes is payable semi-annually beginning
on August 15, 1999. The Company used a majority of the proceeds to repay amounts
then  outstanding  under its  revolving  lines of credit and the  remainder  for
capital expenditures.

     The Company may offer from time to time in one or more series (i) unsecured
debt securities,  which may be senior or subordinated,  (ii) preferred stock and
(iii) common stock or any  combination of the  foregoing,  up to an aggregate of
$41,041,600 pursuant to an effective "shelf"  registration  statement filed with
the Securities and Exchange Commission ("SEC").

     In addition,  under another effective "shelf" registration  statement filed
with the SEC, the Company may offer up to an aggregate  of  $200,000,000  of the
following  securities,  in any  combination,  from  time  to time on one or more
series:  unsecured  debt  securities,  which may be  senior  or  unsubordinated;
preferred stock; common stock; and trust preferred securities.

     From  January 1, 1999,  through  November 12,  1999,  the Company  received
$5,175,000 from the exercise of common stock purchase  warrants and options.  In
connection  with these  exercises,  the Company will also receive  approximately
$879,000 in tax savings.

     On July 26, 1999, the Company's wholly-owned  subsidiary,  DDD Energy, sold
its 18.75%  working  interest in 11 oil and gas wells,  one salt water  disposal
well and  approximately  16,000 acres of leasehold  and options to lease for net
proceeds of approximately $11.7 million.

     The Company has announced its intentions to sell  approximately  90% of its
ownership in DDD Energy,  through an initial public  offering  expected to close
during the first  quarter of 2000. In the event the sale is not  completed,  DDD
Energy will continue to be a wholly-owned subsidiary of the Company. The Company
does not anticipate a loss will be incurred on this  transaction.  Proceeds from
the proposed  offering will be used to reduce debt and provide funds for seismic
data library additions.

     During December 1997, the Company  repurchased 175,000 shares of its common
stock in the open market at a cost of $2,973,000, pursuant to a stock repurchase
program authorized by the Board of Directors on December 12, 1997. The Board has
authorized  expenditures  of up to $25  million  towards the  repurchase  of its
common stock.

     During the first nine months of 1999, gross seismic data bank additions and
capitalized  oil  and  gas   exploration  and  development   costs  amounted  to
$97,816,000 and $17,618,000 respectively. These capital expenditures, as well as
taxes, interest expenses, cost of sales and general and administrative expenses,
were funded by  operations,  proceeds  from the sale of oil and gas  properties,
proceeds  from the  exercise of common  stock  purchase  warrants  and  options,
borrowings  under the Company's  revolving  line of credit and proceeds from the
issuance of senior notes.

     Currently,  the Company anticipates capital  expenditures for the remainder
of  1999  to  total  approximately  $20  million.   Such  expenditures   include
approximately  $14 million for the creation of  proprietary  seismic  data,  and
approximately  $6 million for oil and gas exploration  and development  efforts.
The Company believes its current cash balances,  revenues from operating sources
and proceeds  from the exercise of common stock  purchase  warrants and options,
combined with its available  revolving  line of credit,  should be sufficient to
fund the  remaining  1999  capital  expenditures,  along with  expenditures  for
operating  and general and  administrative  expenses.  If these  sources are not
sufficient to cover the  Company's  anticipated  expenditures  or if the Company
were to increase its planned  capital  expenditures  for 1999, the Company could
arrange for additional debt or equity financing during 1999; however,  there can
be no assurance  that the Company would be able to  accomplish  any such debt or
equity financing on satisfactory  terms. If such debt or equity financing is not
available on  satisfactory  terms,  the Company could reduce its current capital
budget or any proposed  increases to its capital budget,  and fund  expenditures
with cash flow generated from operating sources.

Recent Accounting Pronouncements

     In June 1998, the Financial  Accounting  Standards Board (FASB) issued SFAS
No. 133,  "Accounting for Derivative  Instruments and Hedging  Activities." SFAS
No.  133, as  amended,  is  required to be adopted on January 1, 2001,  although
earlier  adoption  is  permitted.   The  statement  establishes  accounting  and
reporting  standards  requiring  that  every  derivative  instrument  (including
certain derivative  instruments  embedded in other contracts) be recorded in the
balance  sheet as either an asset or liability  measured at its fair value.  The
statement  requires  that changes in the  derivative's  fair value be recognized
currently in earnings unless specific hedge accounting criteria are met. Special
accounting  for  qualifying  hedges  allows a  derivative's  gains and losses to
offset related results on the hedged item in the income statement,  and requires
that a company formally  document,  designate,  and assess the  effectiveness of
transactions that receive hedge  accounting.  The Company has not yet quantified
the impact of adopting  Statement 133.  However,  the Company  anticipates  that
application  of the statement  will not have a material  impact on the Company's
financial position or results of operations.

Year 2000

     Many currently  installed  computer systems and software products are coded
to accept only two-digit  entries in the date code field.  Beginning in the year
2000,  these  date  code  fields  will  need to  accept  four-digit  entries  to
distinguish  21st century dates from 20th century dates.  As a result,  computer
systems and software  used by many  companies  may need to be upgraded to comply
with such "Year 2000"  requirements.  Significant  uncertainty exists concerning
the potential effects  associated with such compliance,  but systems that do not
properly  recognize such  information  could generate  erroneous data or cause a
system to fail.

     Compliance  Program.  In order to address the Year 2000 issue,  the Company
appointed  the Chief  Operating  Officer  ("COO") to assure  that key  automated
systems and related processors would remain functional through 2000. The COO and
the Company's Information Systems Manager addressed the project by reviewing the
information   technology  ("IT")  and  non-information   technology  systems  to
determine  whether they were Year 2000  compliant.  Also, they prepared a formal
questionnaire for all significant suppliers, customers, and service providers to
determine the extent to which the Company was vulnerable to those third parties'
failure to remediate the Year 2000 problem.

     Company's  State of Readiness.  A review and assessment of the  information
technology and  non-information  technology  systems was completed as of January
31,  1999 and did not  identify  any  material  systems  which are not Year 2000
compliant.  The  Company  prepared  and  sent  a  formal  questionnaire  to  all
significant  suppliers,  customers and service providers to determine the extent
to which the Company is vulnerable to those third parties'  failure to remediate
the Year 2000 problem.  The Company  requested that these  companies  respond no
later than June 30,  1999.  As of November  12,  1999,  the Company has received
written  assurances  of  Year  2000  compliance  from  approximately  57% of its
suppliers,  customers  and service  providers.  Companies who have not responded
have been sent second requests to respond to the questionnaire.  The Company has
received oral  assurances of Year 2000 compliance from many of the third parties
with whom it has  relationships.  The Company  believes that its operations will
not be  significantly  disrupted even if third parties with whom the Company has
relationships are not Year 2000 compliant.
<PAGE>

     Costs to Address Year 2000 Compliance  Issues. The Company believes that it
will not be required to make any material  expenditures to address the Year 2000
problem as it relates to its existing  systems.  The Company estimates its total
costs already  expended and to be expended will be less than $100,000.  To date,
costs incurred to address Year 2000  compliance have been internal in nature and
have been charged to income as  incurred.  Such costs have been funded from cash
provided by operating  activities.  However,  uncertainty  exists concerning the
potential costs and effects  associated with any Year 2000  compliance,  and the
Company  intends to continue to make  efforts to ensure that third  parties with
whom it has relationships  are Year 2000 compliant.  The Company is not aware of
any IT projects that have been delayed due to the Year 2000 compliance program.

     Risk of  Non-Compliance  and  Contingency  Plan.  The goal of the Year 2000
project has been to ensure that all of the critical systems and processes, which
are under the direct control of the Company, remain functional. However, because
certain  systems and processes may be  interrelated  with systems outside of the
control of the Company,  there can be no assurance that all implementations will
be  successful.  The principal  area of risk to the Company is thought to be the
contracting  of  seismic  acquisition  crews and  vessels.  A likely  worst case
scenario is that despite the Company's efforts,  there could be a failure of the
global positioning system used by seismic acquisition crews and vessels that the
Company  contracts  which  could  result  in  the  temporary  cessation  of  the
acquisition of seismic data. However, the Company believes that the risk of such
occurrence is low based upon its  discussions  concerning  Year 2000  compliance
with  third  party  seismic  contractors.  As part  of the  Year  2000  project,
contingency plans will be developed to respond to any potential failures as they
may  be  identified.  There  can  be no  assurance  that  unexpected  Year  2000
compliance problems of either the Company or its vendors,  customers and service
providers  would not  materially  and adversely  affect the Company's  business,
financial  condition or operating results.  The Company will continue throughout
1999 to consider the likelihood of a material  business  interruption due to the
Year 2000 issue.

Information Regarding Forward Looking Statements

     This  Quarterly  Report on Form 10-Q includes  forward  looking  statements
within the meaning of Section 27A of the  Securities Act of 1933 and Section 21E
of the Securities  Exchange Act of 1934.  Although the Company believes that its
expectations are based on reasonable assumptions,  it can give no assurance that
its goals will be achieved.  Among the important factors that could cause actual
results to differ materially from those in the forward looking statements herein
include,  but are not  limited  to,  changes in the  exploration  budgets of the
Company's  seismic data and related services  customers,  actual customer demand
for the Company's seismic data and related services, the extent of the Company's
success in acquiring oil and gas properties and in  discovering,  developing and
producing  reserves,  the timing and extent of changes in  commodity  prices for
natural gas,  crude oil and condensate and natural gas liquids and conditions in
the capital markets and equity markets during the periods covered by the forward
looking  statements.  The foregoing and other risk factors are identified in the
Company's  Annual  Report on Form 10-K filed with the  Securities  and  Exchange
Commission for the year ended December 31, 1998.

Item 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
           ----------------------------------------------------------

     The  Company  is  exposed  to market  risk,  including  adverse  changes in
commodity prices,  interest rates and foreign currency exchange rates.  Refer to
the  Company's  Form 10-K for the year ended  December  31,  1998 for a detailed
discussion of these risks. The following  information  discusses  changes in the
Company's market risk exposures since December 31, 1998.

Commodity Price Risk

     During  1999,  the Company has entered  into  natural gas swaps in order to
hedge a portion of anticipated natural gas production.  As of November 12, 1999,
the Company had open  commodity  price  hedges  totaling  2,595,000  MMbtu at an
average price of $2.52 per MMbtu.

Interest Rate Risk

     In February 1999, the Company completed a private placement of three series
of unsecured  Senior Notes totaling $138 million at an average  interest rate of
7.3%.  The Series D Notes total $20  million,  bear  interest at a fixed rate of
7.03% and mature on February  15,  2004,  with no  principal  payments due until
maturity. The Series E Notes total $75 million, bear interest at a fixed rate of
7.28% and mature on February 15, 2009, with annual  principal  payments of $12.5
million beginning February 15, 2004. The Series F Notes total $43 million,  bear
interest  at a fixed  rate of 7.43% and mature on  February  15,  2009,  with no
principal payments due until maturity. The carrying value and fair value of this
debt are the same.
<PAGE>

                           PART II - OTHER INFORMATION


Items 1., 2., 3.  Not applicable.
- ---------------------------------

Item 4.  Submission of Matters to a Vote of Security Holders.
- -------------------------------------------------------------

     The Company's  Annual  Meeting of  Stockholders  was held on July 29, 1998.
Matters voted upon at the Annual Meeting,  and the results of those votes are as
follows:

1. The election of nine directors to serve until the 2000 Annual Meeting.

      Name                    No. of Votes For            No. of Votes Withheld
- --------------------    --------------------------     -------------------------

Herbert M. Pearlman              21,931,489                      674,081
Paul A. Frame                    21,931,489                      674,081
Horace A. Calvert                21,931,489                      674,081
David S. Lawi                    21,931,489                      674,081
Debra D. Valice                  21,931,489                      674,081
Walter M. Craig, Jr.             21,931,489                      674,081
William Lerner                   21,931,089                      674,481
John E. Stieglitz                21,931,289                      674,281
Fred S. Zeidman                  21,931,289                      674,281



<PAGE>


2.  Approval of proposed  amendments to the  Company's  Non-Employee  Directors'
Stock Option Plan.

  No. of Votes For         No. of Votes Against         No. of Votes Abstained
- --------------------    --------------------------     -------------------------

    5,789,492                    10,585,152                      121,720

3. Approval of the appointment of the public  accounting firm of Arthur Andersen
LLP to act as the Company's  independent  Certified  Public  Accountants for the
year of 1999.

  No. of Votes For         No. of Votes Against         No. of Votes Abstained
- --------------------    --------------------------     -------------------------

   22,444,447                       107,715                       53,408

Item 5.  Other Information.
- --------------------------

     A shareholder  who wishes to make a proposal at the 2000 Annual  Meeting of
Shareholders  without  complying with the  requirements  of Rule 14a-8 under the
Securities Exchange Act of 1934, as amended (and therefore without including the
proposal  in  the  Company's  proxy  materials)   should  notify  the  Company's
Secretary, at the Company's principal executive offices, of that proposal by May
8, 2000.  If a  shareholder  fails to give that  notice by that  date,  then the
persons named as proxies in the proxy cards  solicited by the Company's Board of
Directors for that meeting will be entitled to vote the proxy cards held by them
regarding that proposal, if properly raised at the meeting, in their discretion.


Item 6.   Exhibits and Reports on Form 8-K
- ------------------------------------------

          (a) Exhibits

               10.1 Non-Employee Directors' Retirement Plan

               10.2 Amendment No. 2 to Seitel, Inc. 1998 Employee Stock Purchase
                    Plan

               10.3 Amended and Restated 1998 Employee Stock Purchase Plan

               10.4 Amendment No. 4, dated as of August 10, 1999,  among Seitel,
                    Inc., a Delaware  Corporation;  the Lenders  executing  this
                    Agreement;  and the First National Bank of Chicago, as Agent
                    for the Lenders

               10.5 First Amendment,  dated as of July 14, 1999, to the Separate
                    Note  Purchase  Agreements,  dated as of February  12, 1999,
                    among Seitel, Inc. and the Noteholders

               10.6 Second Amendment, dated as of July 14, 1999, to the Separate
                    Note  Purchase  Agreements,  dated as of December  28, 1995,
                    among Seitel, Inc. and the Noteholders

          (b) Not applicable



<PAGE>



                                   SIGNATURES


     Pursuant to the  requirements  of the  Securities and Exchange Act of 1934,

the  registrant  has duly  caused  this report to be signed on its behalf by the

undersigned thereunto duly authorized.


                                       SEITEL, INC.




Dated:  November  12,  1999            /s/  Paul A. Frame
                                       -----------------------------------------
                                            Paul A. Frame
                                            President




Dated:  November  12,  1999            /s/  Debra D. Valice
                                       -----------------------------------------
                                            Debra D. Valice
                                            Chief Financial Officer




Dated:  November  12,  1999            /s/  Marcia H. Kendrick
                                       -----------------------------------------
                                                Marcia H. Kendrick
                                                Chief Accounting Officer




<PAGE>





                                     EXHIBIT
                                      INDEX
- -------  ----------------------------------------------------------  -----------

Exhibit  Title                                                           Page
                                                                        Number
- -------  ----------------------------------------------------------  -----------

10.1     Non-Employee Directors' Retirement Plan                           21

10.2     Amendment No. 2 to Seitel, Inc. 1998 Employee
         Stock Purchase Plan                                               32

10.3     Amended and Restated 1998 Employee Stock Purchase Plan            34

10.4     Amendment No. 4, dated as of August 10, 1999, among
         Seitel, Inc., a Delaware Corporation; the Lenders
         executing this Agreement; and the First National Bank of
         Chicago, as Agent for the Lenders                                 62

10.5     First  Amendment,  dated  as  of  July  14,  1999,
         to  the  Separate  Note  Purchase Agreements,
         dated as of February 12, 1999, among Seitel, Inc.
         and the Noteholders                                               79

10.6     Second  Amendment,  dated  as of  July  14,  1999,
         to  the  Separate  Note  Purchase Agreements,
         dated as of December 28, 1995, among Seitel, Inc.
         and the Noteholders                                               94



                                  SEITEL, INC.

                            DIRECTOR RETIREMENT PLAN


                                    ARTICLE I

                        PURPOSE; FINANCING PLAN BENEFITS

         1.1  Purpose.  The  purposes of this Plan are to attract and retain the
best available personnel for service as Outside Directors (as defined herein) of
the Company,  to provide  additional  incentive to the Outside  Directors of the
Company to serve as Directors,  and to encourage their continued  service on the
Board.

         1.2 Financing  Plan Benefits.  All Retirement  Benefits under this Plan
shall be paid or provided  directly by the  Company.  Such  Retirement  Benefits
shall be  general  obligations  of the  Company  which  shall  not  require  the
segregation of any funds or property therefor. Notwithstanding the foregoing, in
the  discretion  of the Company,  the  Company's  obligations  hereunder  may be
satisfied from a grantor trust  established  by the Company,  the terms of which
will be  substantially  similar  to the terms of the model  trust  issued by the
Internal  Revenue  Service  in Revenue  Procedure  92-64,  or from an  insurance
contract or contracts owned by the Company. The assets of any such trust and any
such  insurance  policy  shall  continue  for all  purposes  to be a part of the
general funds of the Company,  shall be considered  solely a means to assist the
Company to meet its contractual obligations under this Plan and shall not create
a funded account or security  interest for the benefit of any Participant  under
this Plan. The Company intends that the Plan shall constitute an "unfunded plan"
for purposes of the Code and, to the extent  applicable,  Title I of ERISA,  and
that in the event the Company is Insolvent any Participant or Beneficiary  shall
have the status of an unsecured  general  creditor of the Company as to the Plan
and any trust fund that may be established by the Company,  or asset  identified
specifically  by the Company,  as a reserve for the discharge of its obligations
under the Plan.

                                   ARTICLE II

                                   DEFINITIONS

     The  following  words and  phrases  when used in this Plan  shall  have the
respective  meanings  set forth  below  unless  the  context  clearly  indicates
otherwise:

     2.1  "Account"  means the separate  bookkeeping  account  established  with
respect to each Participant to which amounts representing his Retirement Benefit
are credited in accordance with Section 4.1 hereof.

     2.2  "Beneficiary"  means the person or persons  designated in writing by a
Participant  pursuant to Section 5.6 to receive his Benefits in the event of his
death.

     2.3 "Board" means the Board of Directors of the Company.

     2.4 "Change in Control" means the occurrence, on or after the date the Plan
is adopted, of any of the following:

                  (i) when any "person" or "group" of persons acting in concert,
         as such terms are used in  Sections  13(d) and 14(d) of the  Securities
         Exchange Act of 1934 (the "Act") (other than the Company,  a subsidiary
         of the  Company  or a Company  employee  benefit  plan,  including  any
         trustee of such plan acting as  trustee) is or becomes the  "beneficial
         owner"  (as  defined  in  Rule  13d-3  under  the  Act),   directly  or
         indirectly,  of securities of the Company  representing more than fifty
         percent  (50%)  of the  combined  voting  power of the  Company's  then
         outstanding  securities  entitled to vote  generally in the election of
         Directors;  provided that "person" shall not include any person (or any
         person acting as a group) which, as of the date of the adoption of this
         Plan,  is  the   "beneficial   owner"  of  securities  of  the  Company
         representing more than fifty percent (50%) of the combined voting power
         of the Company's  outstanding  securities entitled to vote generally in
         the election of Directors; or

                  (ii) a merger or  consolidation  of the Company with any other
         corporation, other than a merger or consolidation which would result in
         the voting  securities  of the Company  outstanding  immediately  prior
         thereto continuing to represent (either by remaining  outstanding or by
         being  converted  into voting  securities of the  surviving  entity) at
         least fifty percent (50%) of the total voting power  represented by the
         voting  securities of the Company or such surviving entity  outstanding
         immediately after such merger or consolidation; or

                  (iii) a change in the  composition  of the  Board,  during any
         twenty-four month period, as a result of which fewer than a majority of
         the directors are Incumbent Directors. "Incumbent Directors" shall mean
         Directors  who either (A) are  Directors  of the Company as of the date
         the Plan is adopted, or (B) are elected, or nominated for election,  to
         the Board  with the  affirmative  votes of at least a  majority  of the
         Incumbent  Directors at the time of such  election or  nomination  (but
         shall not include an  individual  not  otherwise an Incumbent  Director
         whose  election  or  nomination  is in  connection  with an  actual  or
         threatened  proxy contest  relating to the election of directors to the
         Company.)

     2.5 "Code" means the Internal Revenue Code of 1986, as amended.

     2.6  "Committee"  means the committee,  as  constituted  from time to time,
appointed by the Board to perform the duties and  responsibilities  allocated to
it pursuant to the terms hereof.  The Committee  shall consist of at least three
members who are not Participants  and,  subject to the limitations  contained in
Section 6.3,  shall be entitled to act with respect to any matter  hereunder for
which it is  responsible  in  accordance  with the decision of a majority of its
members. If the Board does not appoint a Committee, the Committee shall mean the
Board.

     2.7 "Common Stock" means the Common Stock,  $.01 par value, of the Company.

     2.8 "Company" means Seitel, Inc., a Delaware corporation.

     2.9 "Continuous Status as a Director" means the absence of any interruption
or termination of service as a Director.

     2.10 "Director" means a member of the Board.

     2.11 "Disability" means a Participant's disability which, in the opinion of
a physician  approved by the Company,  renders the Participant unable to perform
his normal duties for the Company.

     2.12  "Employee"  means  any  person,  including  officers  and  Directors,
employed by the Company or any parent or subsidiary of the Company.  The payment
of a Director's  fee by the Company  shall not be sufficient in and of itself to
constitute "employment" by the Company.

     2.13 "Enrollment  Form" means the form executed by each  Participant  under
the Plan  pursuant to which the  Participant  enrolls in the Plan,  designates a
Beneficiary  and  makes an  election  regarding  the  form in  which  Retirement
Benefits will be paid.

     2.14 "ERISA" means the Employee  Retirement Income Security Act of 1974, as
amended.

     2.15 "Fair Market Value" means,  as of any date,  the value of Common Stock
determined as follows:

                  (i) If the  Common  Stock is listed on any  established  stock
         exchange or a national market system,  including without limitation the
         Nasdaq  National  Market  of the  National  Association  of  Securities
         Dealers,  Inc. Automated  Quotation  ("NASDAQ") System, the Fair Market
         Value of a Share of Common  Stock shall be the closing  sales price for
         such stock (or the closing bid, if no sales were reported) as quoted on
         such system or exchange  (or the exchange  with the greatest  volume of
         trading in Common Stock) on the date of  determination,  as reported in
         The Wall  Street  Journal  or such  other  source  as the  Board  deems
         reliable;

                  (ii) If the Common  Stock is quoted on the NASDAQ  System (but
         not on the National Market thereof) or regularly quoted by a recognized
         securities dealer but selling prices are not reported,  the Fair Market
         Value of a Share of Common Stock shall be the mean between the high bid
         and low asked prices for the Common Stock on the date of determination,
         as  reported  in The Wall  Street  Journal or such other  source as the
         Board deems reliable; or

                  (iii) In the absence of an  established  market for the Common
         Stock,  the Fair Market Value thereof shall be determined in good faith
         by the Committee.

     2.16  "Initial  Participation  Date" means the date on which a  Participant
commences participation in the Plan pursuant to Section 3.1.

     2.17  "Insolvent"  means the Company  being unable to pay its debts as they
mature or being  subject to a pending  proceeding  as a debtor  under the United
States Bankruptcy Code.

     2.18 "Normal Retirement Age" means the date a Participant attains age 65.

     2.19 "Outside Director" means a Director who is not an Employee.

     2.20 "Participant" means an Outside Director who is eligible to participate
in the Plan pursuant to Article III hereof and who has  commenced  participation
by executing an Enrollment Form.

     2.21 "Plan" means the Seitel,  Inc. Director  Retirement Plan, as set forth
herein and as it may be amended from time to time.

     2.22 "Retirement Benefits" mean the vested portion of amounts credited to a
Participant's Account pursuant to Section 4.1  hereof.

                                   ARTICLE III

                          ELIGIBILITY AND PARTICIPATION

         3.1  Eligibility to Participate.  Each Outside  Director who has, as of
the effective date of the Plan,  completed at least ten years Continuous  Status
as a Director  shall be eligible to  participate in the Plan effective as of the
date such Outside Director returns a properly completed and executed  Enrollment
Form to the  Committee.  Each  other  Outside  Director  shall  be  eligible  to
participate  in the  Plan as of the  later  of (i) the  first  day of the  month
following the month in which the Outside  Director  completes at least ten years
Continuous Status as a Director or (ii) the date such Outside Director returns a
properly completed and executed Enrollment Form to the Committee.

         3.2  Cessation  of  Participation.  A  Participant  will cease to be an
active  Participant  in the Plan as of the  earlier of (i) the date on which the
Plan  terminates  or (ii) the  date on which  the  Participant  ceases  to be an
Outside Director.

                                   ARTICLE IV

                         RETIREMENT BENEFITS AND VESTING

         4.1  Retirement  Benefits.  The  Company  shall  credit  amounts  to  a
Participant's  Account as a Retirement  Benefit in accordance  with this Section
4.1 to be distributed,  to the extent vested under Section 4.2 hereof,  pursuant
to the provisions of Article V. On the Participant's Initial Participation Date,
the Company shall credit to the Participant's  Account an amount equal to $5,000
times such  Participant's  years of continuous  service as an Outside  Director,
determined  based  on the  twelve  month  periods  commencing  on the  date  the
Participant  became an Outside Director and ending on the Participant's  Initial
Participation Date. In addition,  the Company shall credit to such Participant's
Account an amount equal to the  increase,  if any, in the Fair Market Value of a
share  of the  Common  Stock on the last  day of the  fifth  fiscal  year of the
Company  ending  after  the  Participant's  Initial  Participation  Date,  or if
earlier,  the date on which the  Participant  ceases to be an Outside  Director,
over the Fair Market Value of a share of the Common  Stock on the  Participant's
Initial Participation Date, multiplied by 15,000.

         4.2  Vesting.  The  Retirement  Benefit  credited  to the  Account of a
Participant under Section 4.1 hereof shall vest and become nonforfeitable at the
rate of 10% on the first day of each  January  after the  Participant's  Initial
Participation  Date,  if the  Participant  is an Outside  Director on that date;
provided,  however,  that a  Participant  will become 100% vested in his Account
regardless  of his  period of  participation  as an Outside  Director  after his
Initial  Participation  Date in the event of (i)  termination of his status as a
Director due to his death or his Disability, (ii) termination of his status as a
Director  by reason of not being  nominated  by the  Company  to  continue  as a
Director or not being elected as a Director  following such nomination,  due, in
each case, to a reason other than his voluntary resignation as a Director, (iii)
a Change in Control, or (iv) termination of the Plan.

                                    ARTICLE V

                                  DISTRIBUTIONS

         5.1 Payment of Benefits. The amount credited to a Participant's Account
pursuant to Section 4.1 hereof,  to the extent  vested  pursuant to Section 4.2,
shall be payable to the  Participant  or, if applicable,  to his  Beneficiary in
accordance  with the  provisions  of this Article V.  Payment of any  Retirement
Benefit under the Plan shall  commence  within 30 days, or as soon as thereafter
as administratively  practicable,  following the occurrence of the event causing
the Retirement Benefit to become payable.

         5.2  Retirement,   Disability,   or  Death.  Upon  termination  of  the
Participant's  Continuous  Status as a Director  on or after his  attainment  of
Normal Retirement Age, or by reason of his Disability or death, the Company will
pay the  value of his  Account  to him in the form he has  elected  pursuant  to
Section  5.5  hereof  (or if he has not  elected,  in the form of a  single  sum
payment).  If such Participant is receiving  installment  payments hereunder and
dies prior to the payment of all monthly installments,  the remaining portion of
the Participant's  Benefits will continue to be paid in monthly  installments to
his  Beneficiary  for the  remaining  installment  period in the same amount and
manner as they would have been paid to the Participant.

         5.3 Other Termination of Continuous Status as a Director.  In the event
the  Participant's  Continuous  Status as a Director  terminates  for any reason
other than  retirement on or after Normal  Retirement Age, death, or Disability,
the value of the vested  portion of his Account as determined  under Section 4.2
hereof  will be paid in the form he has  elected  pursuant to Section 5.5 hereof
(or if he  has  not  elected,  in the  form  of a  single  sum  payment)  on the
Participant's  attainment  of his  Normal  Retirement  Age or, if  earlier,  the
Participant's  death.  If such  Participant  is receiving  installment  payments
hereunder  and dies but prior to the  payment of all monthly  installments,  the
remaining  portion of the  Participant's  Benefits  will  continue to be paid in
monthly installments to his Beneficiary for the remaining  installment period in
the same amount and manner as they would have been paid to the Participant.

         5.4 Timing of Certain Payments.  Notwithstanding any other provision of
this Agreement to the contrary,  the  Participant's  Retirement  Benefit will be
payable upon the occurrence of a Change in Control, and the Committee shall have
the right to pay  Retirement  Benefits  to  Participants  prior to the time such
Retirement  Benefits  otherwise  would be payable  hereunder if the Committee in
good faith  determines that such payment is in the best interests of the Company
and the Participant due to the occurrence of a change in circumstances  relating
to the  operation  of the Plan or the taxation of  Participants,  arising from a
change in the  federal or  applicable  state tax or revenue  laws,  a  published
ruling or similar  announcement by the Internal  Revenue  Service,  a regulation
issued  by the  Secretary  of the  Treasury,  a  change  in  securities  laws or
regulations,  the issuance of an advisory opinion, regulation or other published
position by the  Department  of Labor,  or a change in  accounting  requirements
which causes (i) Participants to be taxable on their  Retirement  Benefits prior
to the time Retirement  Benefits otherwise would be payable hereunder,  (ii) the
Plan to be  considered  as funded for  purposes of Title I of ERISA,  or (iii) a
material  change  regarding  the tax or  financial  accounting  consequences  of
maintaining the Plan to the Company.

         5.5 Form of Payment.  Each Participant may elect on his Enrollment Form
whether his Retirement Benefits will be paid in the form of a single sum payment
or  substantially  equal  monthly  installments  over a period not exceeding 120
months.  Such election may not be changed by the Participant during the one-year
period ending on the date on which payment of his Retirement  Benefits  commence
or at any time thereafter. Notwithstanding any other provision of this Article V
regarding the form in which Retirement Benefits will be paid to Participants, if
a  Participant  has not  elected a form of payment for his  Retirement  Benefits
pursuant to this Section 5.5, the Company will pay the Participant's  Retirement
Benefits in a single sum payment.

         5.6  Designation  of  Beneficiary.  Each  Participant  must designate a
Beneficiary  to receive his  Retirement  Benefits in the event of his death,  by
completing his Enrollment  Form and filing it with the Committee.  The Committee
will recognize the most recent written Beneficiary  designation on file prior to
a Participant's death. If a designated  Beneficiary is not living at the time of
the Participant's  death,  then the Committee will pay Participant's  Retirement
Benefits   to  the   Participant's   personal   representative,   executor,   or
administrator,  as specified by the  appropriate  legal  jurisdiction.  Any such
payment to the  Participant's  Beneficiary  or, if  applicable,  to his personal
representative,  executor or administrator shall operate as a complete discharge
of all obligations of the Committee and the Company to the extent of the payment
so made.

                                   ARTICLE VI

                               PLAN ADMINISTRATION


         6.1 Authority of the Committee. The Committee shall have full power and
authority  to  interpret,  construe and  administer  the Plan.  The  Committee's
interpretation and construction  hereof,  and actions  hereunder,  including any
determination  of the amount or  recipient  of any  payment to be made under the
Plan,  shall be binding and  conclusive on all persons and for all purposes.  In
addition,   the  Committee  may  employ   attorneys,   accountants,   and  other
professional advisors to assist the Committee in its administration of the Plan.
The Company shall pay the  reasonable  fees of any such advisor  employed by the
Committee.

         6.2  Cost of  Administration.  The cost of this  Plan and the  expenses
of  administering  the Plan  shall be paid by the Company.

         6.3 Limitations on Plan Administration.  Neither the Committee, nor any
other person to whom discretionary  authority is granted hereunder shall vote or
act upon any matter  involving his own rights,  benefits or participation in the
Plan.

                                   ARTICLE VI

                            AMENDMENT AND TERMINATION


         7.1  Amendment.  The Company shall have the right to amend this Plan at
any time and from time to time,  including  a  retroactive  amendment.  Any such
amendment  shall  become  effective  upon the  date  stated  therein;  provided,
however,  that no such action shall affect any Retirement  Benefit  adversely to
which a  Participant  would  be  entitled  had his  employment  been  terminated
immediately  before such amendment was effective and no amendment may change the
provisions of Section 5.4 for a period of two years  following the occurrence of
an event described in such Section.

         7.2 Termination of the Plan. The Company has established this Plan with
the bona fide intention and  expectation  that from year to year it will deem it
advisable  to  continue  it  in  effect.  However,  the  Company,  in  its  sole
discretion,  reserves  the right to  terminate  the Plan in its  entirety at any
time; provided, however, that no such action shall affect any Retirement Benefit
adversely  to which a  Participant  would be entitled  had his  employment  been
terminated immediately before such termination was effective.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

         8.1  Rights  Against  Company  and  Company's   Shareholders.   Nothing
contained in the Plan shall be deemed to give any Director the right to continue
as a Director or to interfere with the right of the Company,  acting through the
Board,  or the Company's  shareholders  to remove any Director at any time or to
fail to nominate or elect such  Director  in the future,  without  regard to the
effect such action may have on any rights under the Plan.

         8.2 Action Taken in Good Faith.  To the extent  permitted by law,  each
member of the Committee and each  employee,  officer and Director of the Company
who has  duties  and  responsibilities  with  respect  to the  establishment  or
administration  of the Plan shall be fully  protected with respect to any action
taken or omitted to be taken by such person in good faith.

         8.3  Indemnification  of Employees and  Directors.  The Company  hereby
indemnifies  each member of the Committee and each other  employee,  officer and
Director of the Company who are delegated administrative  responsibilities under
the Plan against any and all  liabilities  and  expenses,  including  attorney's
fees,   actually  and  reasonably  incurred  by  them  in  connection  with  any
threatened,  pending or  completed  legal  action or judicial or  administrative
proceeding  to  which  they may be a party,  or may be  threatened  to be made a
party,  by  reason  of  membership  on the  Committee  or  other  delegation  of
administrative  responsibilities,  except with regard to any matters as to which
they  shall be  adjudged  in such  action or  proceeding  to be liable for gross
negligence or willful misconduct in connection therewith.

         8.4 Payment Due an  Incompetent.  If the Committee  shall find that any
person  to whom any  payment  is due  under  the Plan is  unable to care for his
affairs  because of mental or  physical  illness,  accident,  or death,  or is a
minor,  any payment due (unless a prior claim therefor shall have been made by a
duly appointed guardian, committee or other legal representative) may be paid to
the spouse,  a child, a parent,  a brother or sister or any person deemed by the
Committee,  in its sole  discretion,  to have incurred  expenses for such person
otherwise  entitled to payment,  in such manner and proportions as the Committee
may determine. Any such payment shall be a complete discharge of the liabilities
of the Company under this Plan, and the Company shall have no further obligation
to see to the application of any money so paid.

         8.5 Spendthrift  Clause. No right, title or interest of any kind in the
Plan shall be transferable or assignable by any Participant or Beneficiary or be
subject  to  alienation,  anticipation,  encumbrance,  garnishment,  attachment,
execution or levy of any kind, whether voluntary or involuntary,  nor subject to
the debts, contracts,  liabilities,  engagements, or torts of the Participant or
Beneficiary.  Any attempt to alienate,  anticipate,  encumber,  sell,  transfer,
assign,  pledge,  garnish,  attach or  otherwise  subject to legal or  equitable
process or encumber or dispose of any interest in the Plan shall be void.

         8.6 Severability. In the event that any provision of this Plan shall be
declared illegal or invalid for any reason,  said illegality or invalidity shall
not affect the remaining  provisions  of this Plan but shall be fully  severable
and this Plan shall be  construed  and  enforced  as if said  illegal or invalid
provision had never been inserted herein.

         8.7  Construction.  The article and  section  headings  and numbers are
included only for  convenience  of reference and are not to be taken as limiting
or  extending  the  meaning  of any of the terms and  provisions  of this  Plan.
Whenever appropriate, words used in the singular shall include the plural or the
plural may be read as the  singular.  When used  herein,  the  masculine  gender
includes the feminine gender.

         8.8 Governing Law. The validity and effect of this Plan, and the rights
and  obligations  of  all  persons  affected  hereby,  shall  be  construed  and
determined in accordance  with the laws of the State of Texas unless  superseded
by federal law.



                         AMENDMENT NO. 2 TO SEITEL, INC.
                        1998 EMPLOYEE STOCK PURCHASE PLAN


         Seitel, Inc., a Delaware corporation (the "Company"), hereby amends the
Seitel,  Inc. 1998 Employee Stock Purchase Plan, as such was previously  amended
by  Amendment  No. 1 to Seitel,  Inc.  1998  Employee  Stock  Purchase  Plan (as
amended,  the "Plan") effective as of January 1, 1999. As amended hereby, all of
the terms of the Plan shall remain in full force and effect.

     1.  Sections  6 of  Article I of the Plan is hereby  amended to read in its
entirety as follows:

          (6)  Eligible  Employee  shall mean any person who is  employed by the
     Company or a Subsidiary in a salaried position,  including, but not limited
     to, any  employee  who is also an officer and  director of the Company or a
     Subsidiary.  With respect to the exercise of Warrants,  the term  "Eligible
     Employee"  shall also mean any person who is a director  of the  Company or
     any Subsidiary of the Company who originally  purchased such Warrants while
     employed by the Company or a Subsidiary in a salaried position.

     2. The Section  entitled  "Warrant Period" of Article V shall be amended to
read in its entirety as follows:

     Warrant Period

          Each Warrant  shall expire on the earlier of (i) the date that is five
     (5) years after the Closing Date (the "Stated Date"), (ii) the date that is
     five business days after an Eligible Employee who originally purchased such
     Warrant  ceases to be an Eligible  Employee  for any reason  other than for
     death, disability or retirement after the age of 65, or (iii) the date that
     is one year after the death,  disability or  retirement  after age 65 of an
     Eligible  Employee  who has  purchased  such  Warrant if he ceases to be an
     Eligible Employee because of his death,  disability or retirement after age
     65 (the  earlier  of (i),  (ii) or (iii)  being  referred  to herein as the
     "Expiration  Date").  As used  herein,  disability  has the meaning used in
     Section 22(e)(3) of the Code.

     3. A new sentence shall be added to the end of Article VIII as follows:

          For purposes of  interpreting  the Event of Default number 2 set forth
     in the Promissory  Note,  "employment with the Payee" shall include serving
     as a non-employee director of the Company or any Subsidiary of the Company.

     4. This Amendment No. 2 is adopted as and shall  constitute an amendment to
the Plan,  and shall be construed in connection  with and as a part of the Plan.
Except as  specifically  amended by this  Amendment  No. 2, all of the terms and
provisions  of the Plan shall  remain in full force and effect.  In the event of
any conflict  between the terms of the Plan and the terms of this  Amendment No.
1, the terms of this Amendment No. 1 shall apply.



                                  SEITEL, INC.
                              AMENDED AND RESTATED
                        1998 EMPLOYEE STOCK PURCHASE PLAN


     Seitel,  Inc., a Delaware  corporation (the  "Company"),  hereby amends and
restates,  effective as of May 10, 1999,  the Seitel,  Inc. 1998 Employee  Stock
Purchase Plan, which was originally  adopted  effective as of September 14, 1998
and amended with Amendment No.1 effective as of September 30, 1998 and Amendment
No. 2 effective as of January 1, 1999 (as amended and restated,  the "Plan"), as
follows:

                                   I. PURPOSE

     The  Plan  is  intended  as an  employment  incentive,  to  retain  in  the
employment  of the  Company  and its  subsidiaries  persons  of  experience  and
ability,  to  encourage  the sense of  proprietorship  of such  persons,  and to
stimulate the active  interest of such persons in the  development and financial
success of the Company.

                                 II. DEFINITIONS

     As used in this  Plan,  the  following  words and  phrases  shall  have the
following meanings:

     (1)  Board of Directors shall mean the Board of Directors of the Company.

     (2)  Closing  Date shall mean the date  designated  by the Company on which
          shares of Common Stock and Original Warrants are purchased by Eligible
          Employees  under the Plan.  The Company shall not designate  more than
          one Closing Date.

     (3)  Code shall mean the Internal Revenue Code of 1986, as amended.

     (4)  Common Stock means the common stock, par value $0.01 per share, of the
          Company.

     (5)  Company  means  Seitel,  Inc.  and any  successor  thereto  by merger,
          consolidation,  liquidation  or other  reorganization  which  has made
          provision for adoption of the Plan and the assumption of the Company's
          obligations hereunder.

     (6)  Eligible Employee shall mean any person who is employed by the Company
          or a Subsidiary in a salaried position, including, but not limited to,
          any  employee  who is also an officer and director of the Company or a
          Subsidiary.  With  respect  to the  exercise  of  Warrants,  the  term
          "Eligible  Employee"  shall also mean any person who is a director  of
          the Company or any Subsidiary of the Company who originally  purchased
          such  Warrants  while  employed  by the Company or a  Subsidiary  in a
          salaried  position.  With  respect to the issuance and exercise of New
          Warrants,  the term "Eligible Employee" shall also mean any person who
          is a director of the Company or any Subsidiary who was employed by the
          Company  or a  Subsidiary  in a  salaried  position  when  he  or  she
          originally  purchased  the  Original  Warrants,  the exercise of which
          gives rise to the issuance of New Warrants.

     (7)  Expiration Date shall mean the Original Warrant  Expiration Date, with
          respect to the Original Warrants,  or the New Warrant Expiration Date,
          with respect to the New Warrants, as the case may be.

     (8)  Five-Day  Warrant  Share  Sales  shall have the  meaning  set forth in
          Section VI hereof.

     (9)  New Warrants shall have the meaning set forth in Section VI hereof.

     (10) New  Warrant  Expiration  Date  shall  have the  meaning  set forth in
          Section VI hereof.

     (11) Original  Warrant  Expiration Date shall have the meaning set forth in
          Section V hereof.

     (12) Original  Warrants  shall  have the  meaning  set  forth in  Section V
          hereof.

     (13) Pledge shall mean a pledge of the shares of Common Stock  purchased by
          an Eligible  Employee as security for the Promissory  Note in the form
          of Exhibit D hereto.

     (14) Promissory  Note shall mean a promissory note in the form of Exhibit C
          hereto  executed by an Eligible  Employee as payment for Common  Stock
          and Original Warrants purchased under the Plan.

     (15) Purchase  Price shall mean,  with respect to one share of Common Stock
          and one Original  Warrant,  the price equal to the closing  price of a
          share of Common  Stock as reported  on the New York Stock  Exchange on
          the day immediately preceding the Closing Date.

     (16) Shares shall have the meaning set forth in Section IV hereof.

     (17) Subscription Agreement shall mean a subscription agreement in the form
          of  Exhibit  B hereto  duly  executed  and  delivered  by an  Eligible
          Employee  to the  Company on or before the  Closing  Date as  provided
          herein.

     (18) Subsidiary  shall  mean any  corporation  to which  the  Company  is a
          "parent  corporation"  as defined in Section 424(e) of the Code.  (19)
          Warrant  Exercise  Date shall have the meaning set forth in Section VI
          hereof.

     (20) Warrants  shall mean the  warrants to purchase  shares of Common Stock
          that may be purchased by Eligible  Employees  pursuant to the terms of
          the Plan, in the form of Exhibit E hereto.

               III. EMPLOYEE STOCK AND ORIGINAL WARRANT PURCHASES

     Eligible Employees may, pursuant to the Plan,  purchase from the Company on
the  Closing  Date shares of Common  Stock and  Original  Warrants.  An Eligible
Employee  may  purchase up to the maximum  number of shares of Common  Stock and
Original  Warrants  set  forth  on  Exhibit  A  hereto  based  on such  Eligible
Employee's   maximum  annual  cash   compensation   from  the  Company  and  its
Subsidiaries  for the 12 month  period ended on December  31st of 1995,  1996 or
1997.  If such  Eligible  Employee  was first  employed  by the  Company  or any
Subsidiary  after January 1, 1997,  the maximum number of shares of Common Stock
and  Original  Warrants  set  forth on  Exhibit  A hereto  shall be based on the
Company's   reasonable   estimate  of  such  Eligible   Employee's  annual  cash
compensation.  Eligible  Employees  must  purchase an equal  number of shares of
Common Stock and Original Warrants,  and Common Stock and Original Warrants must
be  purchased  in whole  multiples of 50 with a minimum of 100. On or before the
Closing  Date,  any Eligible  Employee who desires to purchase  Common Stock and
Original  Warrants  shall  complete  and deliver to the Senior Vice  President -
Finance of the Company a duly  executed  Subscription  Agreement  in the form of
Exhibit B  hereto,  a duly  executed  Promissory  Note in the form of  Exhibit C
hereto and a duly executed Pledge in the form of Exhibit D hereto.

                         IV. SHARES SUBJECT TO THE PLAN

     A total of TWO MILLION  THREE  HUNDRED  SEVENTY-NINE  THOUSAND  (2,379,000)
shares of Common  Stock of the Company  (the  "Shares")  shall be subject to the
Plan,  which  shall  include  shares of Common  Stock that may be  purchased  by
Eligible Employees on the Closing Date and thereafter upon exercise of Warrants.
The  Shares  shall  consist  of  unissued  shares or  previously  issued  shares
reacquired  and held by the  Company,  and such number of shares shall be and is
hereby reserved for sale for such purpose.  Until  expiration or exercise of all
of the Warrants,  the Company shall at all times reserve a sufficient  number of
Shares to be issued upon exercise thereof.

                              V. ORIGINAL WARRANTS

     The  Warrants to be issued  pursuant  to Section III hereof (the  "Original
Warrants")  shall be in the form  attached  hereto as  Exhibit  E. The  Original
Warrants shall provide as follows:

Exercise Price

     The  exercise  price per Share of the  Original  Warrants  shall  equal one
hundred twelve and one-half percent  (112-1/2%) of the Purchase Price rounded up
to the next one-quarter of one dollar.

Original Warrant Period

     Each  Original  Warrant shall expire on the earlier of (i) the date that is
five (5) years after the Closing Date (the "Stated Date"), (ii) the date that is
five  business days after an Eligible  Employee who  originally  purchased  such
Original Warrant ceases to be an Eligible Employee for any reason other than for
death,  disability or retirement  after the age of 65, or (iii) the date that is
one year after the death,  disability or retirement  after age 65 of an Eligible
Employee who originally  purchased  such Original  Warrant if he ceases to be an
Eligible  Employee  because of his death,  disability or retirement after age 65
(the  earlier of (i),  (ii) or (iii) being  referred to herein as the  "Original
Expiration  Date").  As used herein,  disability has the meaning used in Section
22(e)(3) of the Code.

Exercise of Original Warrants

     Any Original  Warrant may be exercised  solely by the Eligible  Employee or
permitted  transferee during his lifetime,  or after his disability by his legal
representative on his behalf, or after his death by the personal  representative
of the Eligible  Employee's  estate or permitted  transferee  (in the event such
Original Warrant was transferred prior to the Eligible  Employee's death) or the
person or persons  entitled  thereto under his will or under the laws of descent
and distribution.

     The  purchase  price  of the  Shares  as to which an  Original  Warrant  is
exercised shall be paid in full in cash at the time of the exercise. An Eligible
Employee  or  permitted  transferee  shall  not be or have any of the  rights or
privileges of a stockholder of the Company in respect of any Shares  purchasable
upon  the  exercise  of  any  part  of an  Original  Warrant  unless  and  until
certificates  representing  such Shares shall have been issued by the Company to
such Eligible Employee or permitted transferee.

Limited Transferability of Warrants

     Original  Warrants shall not be  transferable  other than by will or by the
laws  of  descent  and  distribution,  except  that  Original  Warrants  may  be
transferred  by an  Eligible  Employee  to  members of the  Eligible  Employee's
immediate family who are U.S. residents or to trusts or business entities formed
for the benefit of members of the Eligible  Employee's  immediate family who are
U.S.  residents.  As  used  herein,  immediate  family  means a  parent,  child,
grandchild,  or spouse. An Original Warrant may not be subsequently  transferred
by the  immediate  family  member of the Eligible  Employee to whom the Original
Warrant  is  transferred  other  than  by will or by the  laws  of  descent  and
distribution.  If an Original  Warrant is  transferred  to an  immediate  family
member, the Company may require investment  representations upon exercise of the
Original  Warrant  and may  impose  such  conditions  upon the  exercise  of the
Original  Warrant as may be required to comply with federal and state securities
laws,  and the Shares of Common  Stock  issuable  upon  exercise  of an Original
Warrant by such immediate family member may be "restricted  shares" as such term
is defined in Rule 144 under the  Securities  Act of 1933,  as amended,  and may
contain such restrictive legends as may be deemed necessary by the Company.

                                VI. NEW WARRANTS

     Upon the exercise of an Original Warrant, one new warrant (a "New Warrant")
shall be issued to the Eligible  Employee who initially  purchased such Original
Warrant from the Company (even if such  Eligible  Employee has  transferred  the
Original  Warrant  as  permitted  hereunder),  provided  that such  person is an
Eligible  Employee  at the time  such  Original  Warrant  is  exercised.  No New
Warrants  will be issued  upon the  exercise  of an  Original  Warrant  after an
Eligible  Employee's  death or  disability.  The New Warrants  shall  provide as
follows:



<PAGE>


Exercise Price

     If a holder  exercises  an Original  Warrant and sells the Shares  received
upon such exercise on the day of such  exercise,  the exercise  price of the New
Warrant  issued upon the exercise of the Original  Warrant shall equal the price
at which  such  Shares  are sold.  For all other New  Warrants  issued  upon the
exercise of an Original  Warrant,  the exercise price shall be determined on the
date the  Original  Warrant is  exercised  (each a "Warrant  Exercise  Date") as
follows:  (i) for any Warrant  Exercise  Date on which the Common Stock shall be
listed on a national securities exchange, the last sale price on such day or, if
there  shall have been no sale on such day,  the  average of the closing bid and
asked prices on such exchange on such day, or (ii) for any Warrant Exercise Date
on which the Common Stock shall not be listed on a national  securities exchange
but  shall  be  included  in the  National  Association  of  Securities  Dealers
Automated  Quotation System  ("NASDAQ"),  the last sale price on such day or, if
there  shall have been no sale on such day,  the  average of the closing bid and
asked  prices  on such day  quoted by  brokers  and  dealers  making a market in
NASDAQ,  furnished by any member of the New York Stock Exchange  selected by the
Company for that  purpose,  or (iii) for any Warrant  Exercise Date on which the
Common  Stock  shall not be so  listed  on a  national  securities  exchange  or
included  in NASDAQ  but shall be quoted  by three  brokers  regularly  making a
market in such shares in the over-the-counter market, the average of the closing
bid and asked prices on such day,  furnished by any member of the New York Stock
Exchange  selected  by the  Company  for that  purpose,  or (iv) for any Warrant
Exercise  Date on which the  information  described in items (i),  (ii) or (iii)
above is  unavailable,  the book value per share of the Common Stock on such day
as determined in accordance with generally accepted accounting principles.

New Warrant Period

     Each New Warrant  shall expire on the earlier of (i) the Stated Date,  (ii)
the date that is five  business  days after  termination  of  employment  if the
Eligible  Employee  who  originally  received  such New Warrant  ceases to be an
Eligible Employee for any reason other than for death,  disability or retirement
after  the age of 65,  or (iii)  the  date  that is one year  after  the  death,
disability or  retirement  after age 65 of an Eligible  Employee who  originally
received such New Warrant if he ceases to be an Eligible Employee because of his
death,  disability or retirement after age 65 (the earlier of (i), (ii) or (iii)
being referred to herein as the "New Warrant  Expiration Date"). As used herein,
disability has the meaning used in Section 22(e)(3) of the Code. Exercise of New
Warrants

     A New Warrant may be exercised solely by the Eligible Employee or permitted
transferee   during  his  lifetime,   or  after  his  disability  by  his  legal
representative on his behalf, or after his death by the personal  representative
of the Eligible Employee's estate or permitted transferee (in the event such New
Warrant was transferred prior to the Eligible Employee's death) or the person or
persons  entitled  thereto  under  his will or under  the  laws of  descent  and
distribution.

     The  purchase  price of the Shares as to which a New  Warrant is  exercised
shall be paid in full in cash at the time of the exercise.  An Eligible Employee
or permitted  transferee shall not be or have any of the rights or privileges of
a  stockholder  of the  Company in respect  of any Shares  purchasable  upon the
exercise of any part of a New Warrant unless and until certificates representing
such Shares shall have been issued by the Company to such  Eligible  Employee or
permitted transferee.

Limited Transferability of New Warrants

     New Warrants shall not be transferable other than by will or by the laws of
descent and  distribution,  except that New  Warrants may be  transferred  by an
Eligible Employee to members of the Eligible Employee's immediate family who are
U.S.  residents  or to trusts or  business  entities  formed for the  benefit of
members of the Eligible Employee's  immediate family who are U.S. residents.  As
used herein,  immediate family means a parent, child,  grandchild,  or spouse. A
New Warrant may not be subsequently  transferred by the immediate  family member
of the Eligible  Employee to whom the New Warrant is  transferred  other than by
will or by the laws of descent and distribution. If a New Warrant is transferred
to  an   immediate   family   member,   the  Company   may  require   investment
representations  upon exercise of the New Warrant and may impose such conditions
upon the  exercise of the New Warrant as may be required to comply with  federal
and state securities laws, and the Shares of Common Stock issuable upon exercise
of a New Warrant by such immediate  family member may be "restricted  shares" as
such term is defined in Rule 144 under the  Securities  Act of 1933, as amended,
and may  contain  such  restrictive  legends as may be deemed  necessary  by the
Company.

Restrictions on Exercise

     New Warrants  may not be exercised  prior to August 10, 1999. A New Warrant
may not be exercised  at any time if, at any time prior to August 10, 1999,  the
Five-Day Warrant Share Sales for the Eligible  Employee to whom such New Warrant
is issued  exceed the  greater  of (i) 3,000 or (ii) 25% of the total  number of
Shares issuable upon the exercise of all Original Warrants  purchased  hereunder
by such Eligible Employee. An Eligible Employee's "Five-Day Warrant Share Sales"
shall be the  total  aggregate  number of  Shares  that are sold by an  Eligible
Employee and all of such Eligible  Employee's  permitted  transferees during any
period of five  trading  days  before  August 10, 1999 to the extent such Shares

<PAGE>

were  purchased  upon the  exercise of an  Original  Warrant on or after May 10,
1999. Any New Warrant shall include the following restrictive legend:

         THIS  WARRANT  MAY NOT BE  EXERCISED  PRIOR TO AUGUST  10,  1999 AND IS
         SUBJECT  TO  FURTHER  RESTRICTIONS  AS SET  FORTH  IN THE  AMENDED  AND
         RESTATED 1998 SEITEL, INC. EMPLOYEE STOCK PURCHASE PLAN.

The  Company  may  require  written  certification  or  other  proof as to facts
relevant to the  restrictions  set forth in this paragraph  prior to issuing any
Shares upon the exercise of a New Warrant.


                               VII. PURCHASE PRICE

     Eligible  Employees shall pay the Company the Purchase Price for each share
of Common Stock and Original Warrant purchased  hereunder  pursuant to the terms
hereof.  The  proceeds  received by the Company from the sale of Shares (both on
the Closing Date and  subsequently  upon the  exercise of Warrants)  pursuant to
this Plan will be used for general corporate purposes.

                               VIII. PAYMENT TERMS

     The  consideration  for  Shares  of  Common  Stock  and  Original  Warrants
purchased  under the Plan shall be payable  pursuant to a Promissory Note in the
form of Exhibit C hereto.  The  Promissory  Note will bear  interest at 4.0% per
annum and be payable as follows:  (i) 60 equal monthly payments of principal and
interest  calculated  so as to pay  interest  as it  accrues  and to reduce  the
principal  balance to 40% of the purchase price on the Stated Date, and (ii) all
outstanding principal and accrued but unpaid interest shall be due on the Stated
Date. Such payments shall be made by payroll deduction (one-half of such payment
twice per month for non-commission employees, or the full amount of such payment
monthly for commission  employees).  Notwithstanding  the  foregoing,  (i) if an
Eligible  Employee  receives  commissions  quarterly  rather than  monthly,  the
Eligible  Employee may elect to defer monthly payments under the Promissory Note
and instead make  quarterly  payments of accrued  interest and  principal at the
time of payment of such quarterly  commission,  provided that such payment shall
in any event be due on or before each April 30, July 30,  October 30 and January
30 prior to the Stated  Date,  and (ii) if an  Eligible  Employee is eligible to
receive  an annual  bonus  from the  Company  pursuant  to a written  employment
contract between the Company and the Eligible  Employee,  the Eligible  Employee
may elect to defer monthly  payments under the Promissory  Note and instead make
annual payments of accrued interest and principal at the time of payment of such
bonus,  provided  that such payment  shall in any event be due on or before each
March 15 prior to the Stated Date.  If the  Expiration  Date occurs prior to the
Stated Date, all amounts due under the Promissory Note shall become  immediately
due and payable on the Expiration  Date. The Promissory  Note will be secured by
the Pledge,  and the Company shall have an express  contractual  right of setoff
against any amounts  otherwise due to an Eligible  Employee for any payments due
under the Promissory  Note,  including any amounts due upon  acceleration of the
maturity thereof.  Notwithstanding any other provision hereof, in the event that
the amount of a paycheck,  commission or bonus is not  sufficient to discharge a
payment due under the Promissory Note, the Eligible Employee will be required to
pay any  difference  to the Company in cash at the time such payment is due. For
purposes  of  interpreting  the  Event  of  Default  number  2 set  forth in the
Promissory  Note,  "employment  with  the  Payee"  shall  include  serving  as a
non-employee director of the Company or any Subsidiary of the Company.

                              IX. PLEDGE OF SHARES

     The  Promissory  Note  shall be secured by a pledge of the Shares of Common
Stock  purchased  by an Eligible  Employee on the Closing  Date  pursuant to the
terms of Pledge in the form of  Exhibit D hereto.  Each  Eligible  Employee  who
executes a  Promissory  Note shall also  execute  and  deliver to the  Company a
Pledge.

                       X. CHANGE OF CONTROL OF THE COMPANY

     In the event the Company shall be a party to any merger,  consolidation  or
corporate  reorganization,  as the  result  of which  the  Company  shall be the
surviving  corporation,  the rights and duties of the Eligible Employees and the
Company shall not be affected in any manner. In the event the Company shall sell
all or  substantially  all of its  assets  or shall  be a party  to any  merger,
consolidation  or corporate  reorganization,  as the result of which the Company
shall not be the surviving  organization,  or in the event any other corporation
may make a tender or  exchange  offer for stock of the  Company  (the  surviving
corporation,  purchaser, or tendering corporation being hereinafter collectively
referred to as the "purchaser," and the transaction being  hereinafter  referred
to as the  "purchase"),  then the Board of Directors  may, at its election,  (i)
reach an  agreement  with the  purchaser  that the  purchaser  will  assume  the
obligations  of the  Company  as to all  outstanding  Warrants;  (ii)  reach  an
agreement with the purchaser  that the purchaser  will convert each  outstanding
Warrant into a Warrant of at least equal value as to stock of the purchaser;  or
(iii)  not  later  than  thirty  (30) days  prior to the  effective  date of the
purchase,  notify all  Eligible  Employees  who hold  Warrants  of the  proposed
purchase  and  afford to each such  Eligible  Employee  the right  prior to such
purchase to exercise any then  unexercised  portion of all Warrants held by him,
which exercise may be contingent upon consummation of the purchase.

                            XI. LIMITATION OF RIGHTS

     Nothing in this Plan shall be construed  to: (1) give an Eligible  Employee
or permitted  transferee any rights  whatsoever  with respect to Shares issuable
upon the exercise of Warrants  until the Warrants are  exercised  and Shares are
issued to the Eligible  Employee or permitted  transferee;  (2) give an Eligible
Employee  or any person any  interest  in any fund or in any  specific  asset or
assets  of the  Company;  (3)  limit in any way the  right of the  Company  or a
Subsidiary to terminate an Eligible Employee's  employment with the Company or a
Subsidiary at any time;  or (4) be evidence of any  agreement or  understanding,
express or  implied,  that the Company or a  Subsidiary  will employ an Eligible
Employee in any particular position or at any particular rate of remuneration.

     The existence of outstanding Warrants shall not affect in any way the right
or power of the Company or its  Subsidiaries  or their  stockholders  to make or
authorize  any or all  adjustments,  recapitalization,  reorganization  or other
changes in the capital  structure  of the Company or its  Subsidiaries  or their
businesses, or any merger or consolidation of the Company or its Subsidiaries or
any issue of bonds,  debentures,  preferred  stock or the right to  acquire  any
thereof,  or the dissolution or liquidation of the Company or its  Subsidiaries,
or any sale or transfer of all or any part of their assets or  business,  or any
other corporate act or proceeding whether of a similar character or otherwise.

                           XII. GOVERNMENT REGULATIONS

     The Plan,  and the  granting and  exercise of Warrants  hereunder,  and the
obligation of the Company to sell and deliver Shares under such Warrants,  shall
be subject to all applicable laws, rules and regulations,  and to such approvals
by  any  governmental  agencies  or  national  securities  exchanges  as  may be
required.

Purchase for Investment

     Whether  or not the  Warrants  and  Shares  covered  by the Plan  have been
registered under the Securities Act of 1933, as amended,  each Eligible Employee
or permitted  transferee  exercising a Warrant may be required by the Company to
give a  representation  in writing that he is acquiring  such Shares for his own
account for investment  and not with a view to, or for sale in connection  with,
the distribution of any part thereof.

Governing Law

     The place of administration of the Plan shall be conclusively  deemed to be
within the State of Texas; and the validity,  construction,  interpretation  and
effect of the Plan and all rights of any of the  persons  having or  claiming to
have any  interest  in the Plan  shall be  governed  by the laws of the State of
Texas.


<PAGE>





                                    Exhibit A
                                       to
                 Seitel, Inc. 1998 Employee Stock Purchase Plan


                                          Maximum Number of Shares of Common
  Maximum Annual Compensation              Stock and Original Warrants
- -------------------------------        -----------------------------------------

      $2,000,001 and over                          75,000/75,000
    $750,001 to $2,000,000                         50,000/50,000
     $200,001 to $750,000                          25,000/25,000
     $100,001 to $200,000                          12,500/12,500
      $50,001 to $100,000                           6,250/6,250
      $25,001 to $50,000                            3,000/3,000
         under $25,001                              1,000/1,000


<PAGE>


                                    Exhibit B
                                       to
                 Seitel, Inc. 1998 Employee Stock Purchase Plan

                             SUBSCRIPTION AGREEMENT


     1.  Subscription.  Subject  to the terms and  conditions  hereof and of the
Seitel,  Inc. 1998 Employee  Stock  Purchase  Plan,  (the  "Subscriber")  hereby
irrevocably  subscribes for and agrees to purchase  shares of Common Stock,  par
value $0.01 per share (the "Shares"),  of Seitel,  Inc., a Delaware  corporation
(the  "Company"),  and  warrants to purchase an equal number of shares of Common
Stock of the Company for $ _____ per share  (the"Warrants") and agrees to become
a shareholder  of the Company and to be bound by the terms of this  Subscription
Agreement  ("Agreement").  As consideration for the Shares and the Warrants, the
Subscriber hereby delivers to the Company a duly executed Promissory Note in the
amount of $________ (the "Purchase Price").

     This  Agreement  shall not  become  binding  unless  this  subscription  is
accepted by the Company,  the Purchase  Price has been  received and accepted by
the Company and such additional closing  conditions as the Company,  in its sole
discretion,  shall require are satisfied.  This subscription shall not be deemed
accepted  by the Company  until this  Agreement  is signed by a duly  authorized
officer of the Company.  If this subscription is accepted,  this Agreement shall
become effective as between the Company and the Subscriber. If this subscription
is  rejected,  this  Agreement  and the  Purchase  Price will be returned to the
Subscriber as soon as reasonably  practicable,  and this  subscription  shall be
rendered void and of no further force or effect.

     2. Acceptance of Subscription.  The Subscriber acknowledges and agrees that
this subscription is made subject to the following terms and conditions:

     (a)  the  Subscriber  is committing to purchase the Shares and Warrants for
          which he has subscribed upon executing this Agreement; and

     (b)  the Company shall have the right to reject this subscription, in whole
          or in part, for any reason whatsoever.

     3.  Acknowledgments,  Representations and Covenants of the Subscriber.  The
Subscriber represents and warrants that:

     (a)  The Subscriber  has been provided with a copy of the prospectus  dated
          September 14, 1998, and  prospectus  supplement  dated  _____________,
          1998, relating to the Shares and the Warrants.

     (b)  The Subscriber  understands that no federal or state agency has passed
          on or  made  any  recommendation  or  endorsement  of  the  Shares  or
          Warrants.



<PAGE>


     4.     Other Matters.

     (a)  The Subscriber  recognizes that the sale of the Shares to him is based
          upon   representations  and  warranties   contained  herein,  and  the
          Subscriber agrees to indemnify the Company and its officers, directors
          and  shareholders  and to  hold  each  of them  harmless  against  any
          liability, costs or expenses (including reasonable attorneys' fees and
          costs)   arising   by   reason   of  or   in   connection   with   any
          misrepresentation  or any breach of such warranties by the Subscriber.
          The covenants,  warranties and representations  contained herein shall
          be for the  benefit of the  Company and its  officers,  directors  and
          shareholders  and each of them shall be  entitled to all of the rights
          that such covenants, warranties and representations shall confer.

     (b)  The Subscriber agrees that, except as provided herein,  this Agreement
          or  any  agreement  made  hereunder  or  pursuant  hereto  may  not be
          canceled, terminated or revoked by him except upon the written consent
          of the Company.

     (c)  The  Subscriber  agrees  to  execute  any  and all  further  documents
          necessary or  advisable,  in the sole  discretion  of the Company,  in
          connection  with his  becoming a holder of the  Shares or any  portion
          thereof.

     (d)  Any notice,  consent,  or other  communication  to be given under this
          Agreement  by any party to any other  party  shall be in  writing  and
          shall be either (a) personally delivered,  (b) mailed by registered or
          certified  mail,  postage prepaid with return receipt  requested,  (c)
          delivered  by overnight  express  delivery  service or same-day  local
          courier service,  or (d) delivered by telex or facsimile  transmission
          to the address set forth beneath the  signature of the parties,  or at
          such other  address as may be  designated  by the parties from time to
          time in accordance with this Section. Notices delivered personally, by
          overnight  express  delivery service or by local courier service shall
          be deemed given as of actual  receipt.  Mailed notices shall be deemed
          given  business  days after  mailing.  Notices  delivered  by telex or
          facsimile  transmission  shall be deemed  given  upon  receipt  by the
          sender  of the  answerback  (in the case of a telex)  or  transmission
          confirmation (in the case of a facsimile transmission).

     (e)  The  parties  acknowledge  and  agree  that  this  Agreement  and  the
          obligations  and  undertakings  of  the  parties   hereunder  will  be
          performable in Houston,  Harris County, Texas. This Agreement shall be
          governed by, and construed and enforced in accordance  with,  the laws
          of the  State of  Texas.  If any  action  is  brought  to  enforce  or
          interpret  this  Agreement,  venue for such action  shall be in Harris
          County, Texas.

     (f)  This  Agreement  constitutes  the entire  agreement  among the parties
          hereto with respect to the subject matter  hereof,  and may be amended
          only by a writing executed by the party to be bound thereby.

<PAGE>


     IN WITNESS WHEREOF, the Subscriber has hereby executed this Agreement as of
the date set forth below.




                           -----------------------------------------------------
                           Printed Name of Subscriber


                           -----------------------------------------------------
                           Subscriber's Street Address


                           -----------------------------------------------------
                           City                 State               Zip Code



                           -----------------------------------------------------
                           Signature of Subscriber


                           -----------------------------------------------------
                           Title (if applicable)

                           -----------------------------------------------------
                           Subscriber's Social Security or Tax ID Number





Date:
              ---------------------------
Accepted:
              ---------------------------

SEITEL, INC.

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












<PAGE>


                                    Exhibit C
                                       to
                 Seitel, Inc. 1998 Employee Stock Purchase Plan
                                 PROMISSORY NOTE


$__________     September ___, 1998


     ________________________ (the "Maker"), for value received, hereby promises
to pay to the order of Seitel,  Inc.  (together  with any successors or assigns,
the "Payee"), at the time and in the manner hereinafter provided,  the principal
sum  of  ___________________Dollars   ($__________  ),  together  with  interest
computed thereon at the rate hereinafter provided. This Note shall be payable at
the office of the Payee at 50 Briar Hollow Lane West,  Houston,  Texas 77027, or
at such other  address in  Houston,  Texas as the holder of this Note shall from
time to time designate.  This Note is made and issued as  consideration  for the
purchase by the Maker of certain  shares  ("Shares") of common stock,  par value
$0.01 per share, of Payee (the "Common Stock") and certain  warrants to purchase
shares of Common Stock (the  "Warrants")  pursuant to the Payee's 1998  Employee
Stock Purchase Plan.

     The  outstanding  principal  amount  of this  Promissory  Note  shall  bear
interest from the date hereof at four percent (4.0%) per annum and be payable as
follows:   (i)  60  equal   monthly   payments  of  principal  and  interest  of
$____________ and (ii) all outstanding principal and accrued but unpaid interest
shall be due on September ____, 2003 (the "Stated Date").  Such monthly payments
shall be made by payroll deduction (one-half of such payment twice per month for
non-commission  employees,  or the  full  amount  of such  payment  monthly  for
commission employees).  Notwithstanding the foregoing, (i) if the Maker receives
commissions  quarterly rather than monthly, the Maker may elect to defer monthly
payments under this Note and instead make quarterly payments of accrued interest
and principal at the time of payment of such quarterly commission, provided that
such  payment  shall in any event be due on or before  each  April 30,  July 30,
October 30 and  January 30 prior to the  Stated  Date,  and (ii) if the Maker is
eligible  to  receive  an  annual  bonus  from the Payee  pursuant  to a written
employment  contract with Payee,  the Maker may elect to defer monthly  payments
under  this Note and  instead  make  annual  payments  of accrued  interest  and
principal at the time of payment of such bonus, provided that such payment shall
in any  event be due on or  before  each  March 15  prior  to the  Stated  Date.
Notwithstanding  any other provision  hereof,  in the event that the amount of a
paycheck,  commission  or bonus is not  sufficient  to  discharge  a payment due
hereunder,  the Maker shall be required to pay any  difference to the Company in
cash at the time such payment is due. All  payments  hereunder  shall be applied
first to accrued  interest and the balance,  if any,  shall be applied to reduce
the principal  amount hereof.  If the period during which the Maker may exercise
the Warrants expires on a date (the"Expiration  Date") prior to the Stated Date,
all amounts due under this Note shall become  immediately due and payable on the
Expiration Date.

     The Payee  shall have an express  contractual  right of setoff  against any
amounts  otherwise  due to the Maker for any payments due under this  Promissory
Note, including any amounts due upon acceleration of the maturity hereof.

     All sums of principal  and  interest  past due under the terms of this Note
shall bear  interest  at a per annum  interest  rate equal to the  maximum  rate
allowed by law from the due date thereof until paid.

     Any one or more of the  following  shall  constitute  an "Event of Default"
hereunder:

     1.       Failure  by the Maker to pay any  amount  that has  become due and
              payable pursuant to any provision of this Note and such amount has
              remained  unpaid  for a period of 10 days from the date of written
              demand by the Payee;

     2.       Termination  of the  Maker's  employment  with the  Payee  for any
              reason whatsoever,  whether voluntary or involuntary,  and whether
              with or without cause;

     3.       A court of competent jurisdiction enters (i) a decree or order for
              relief  in  respect  of  the  Maker  in  an  involuntary  case  or
              proceeding  under  any  applicable  federal  or state  bankruptcy,
              insolvency, reorganization or other similar law and such decree or
              order  remains  in effect for a period of 60 days or (ii) a decree
              or order adjudging the Maker a bankrupt or insolvent, or approving
              as properly filed a petition seeking reorganization,  arrangement,
              adjustment or  composition of or in respect of the Maker under any
              applicable  federal  or state  law,  or  appointing  a  custodian,
              receiver,  liquidator,  assignee,  trustee,  sequestrator or other
              similar  official of the Maker or of any  substantial  part of the
              property of the Maker and such  decree or order  remains in effect
              for a period of 30 days; and

     4.       The Maker (i) commences a voluntary  case or proceeding  under any
              applicable federal or state bankruptcy, insolvency, reorganization
              or  other  similar  law or any  other  case  or  proceeding  to be
              adjudicated a bankrupt or insolvent; (ii) files a petition, answer
              or consent  seeking  reorganization  or similar  relief  under any
              applicable federal or state law; (iii) makes an assignment for the
              benefit of  creditors;  or (iv) admits in writing its inability to
              pay its debts generally as they become due.

     In the event of a default  hereunder or if this Note is placed in the hands
of an attorney for collection (whether or not suit is filed), or if this Note is
collected by suit or legal proceedings or through  bankruptcy  proceedings,  the
Maker agrees to pay in addition to all sums then due hereon, including principal
and  interest,  all  expenses  of  collection,  including,  without  limitation,
reasonable attorneys' fees.

     This Note may be  prepaid  in whole or in part  from time to time,  without
premium or penalty.  Each  prepayment of principal  shall be  accompanied  by an
amount equal to the accrued interest on the principal amount prepaid to the date
of such prepayment.

     The Payee shall be entitled  to  accelerate  this Note and declare all sums
due  hereunder  immediately  due and payable upon default by the Maker in any of
its  obligations  under the Seitel,  Inc. 1998 Employee Stock Purchase Plan, any
agreement executed in connection therewith or this Note.

     The Maker and any and all sureties,  guarantors  and endorsers of this Note
and all other parties now or hereafter  liable  hereon,  severally  waive grace,
demand,  presentment  for  payment,  notice of  dishonor,  protest and notice of
protest,  notice of intention to accelerate,  notice of acceleration,  any other
notice and  diligence in  collecting  and bringing suit against any party hereto
and agree (i) to all extensions and partial  payments,  with or without  notice,
before or after maturity,  (ii) to any substitution,  exchange or release of any
security now or hereafter given for this Note, (iii) to the release of any party
primarily or secondarily  liable hereon,  and (iv) that it will not be necessary
for the  holder  hereof,  in order to enforce  payment  of this  Note,  to first
institute or exhaust such holder's remedies against the Maker or any other party
liable  therefor or against any security for this Note.  No delay on the part of
the Payee in  exercising  any power or right under this Note shall  operate as a
waiver of such power or right,  nor shall any single or partial  exercise of any
power of right preclude further exercise of that power or right.

     A security  interest in the Stock has been granted by Maker to the Payee to
secure the  payment of this Note  pursuant to the terms and  conditions  of that
certain  Pledge by the  Maker,  dated as of the date  hereof,  and to secure the
payment of any costs and expenses  incurred by the Payee in the  collection  and
enforcement hereof.

     The  Maker  understands  that this Note may be  pledged  to secure  certain
obligations of the Payee and hereby consents to any such pledge.

     All  agreements  between  the  Maker and the  holder  hereof,  whether  now
existing or hereafter  arising and whether written or oral, are hereby expressly
limited  so that in no  contingency  or event  whatsoever,  whether by reason of
acceleration  of the maturity  hereof,  or otherwise,  shall the amount paid, or
agreed to be paid, to the holder hereof for the use, forbearance or detention of
the funds  advanced  pursuant to this Note, or otherwise,  or for the payment or
performance  of any  covenant  or  obligation  contained  herein or in any other
document or  instrument  evidencing,  securing or pertaining to this Note exceed
the maximum amount  permissible  under applicable law. If from any circumstances
whatsoever  fulfillment  of any  provision  hereof  or  any  other  document  or
instrument  exceeds the maximum amount of interest  prescribed by law, then ipso
facto,  the  obligation  to be  fulfilled  shall be reduced to the limit of such
validity,  and if from any such  circumstances  the  holder  hereof  shall  ever
receive  anything of value deemed interest by applicable law, which would exceed
interest at the  highest  lawful  rate,  such  amount  which would be  excessive
interest  shall be applied to the reduction of the unpaid  principal  balance of
this Note or on account of any other principal  indebtedness of the Maker to the
holder hereof, and not to the payment of interest, or if such excessive interest
exceeds the unpaid principal  balance of this Note and such other  indebtedness,
such excess shall be refunded to the Maker. All sums paid, or agreed to be paid,
by the Maker for the use,  forbearance or detention of the  indebtedness  of the
Maker to the holder of this Note shall,  to the extent  permitted by  applicable
law, be amortized,  prorated,  allocated and spread  throughout the full term of
such  indebtedness  until payment in full so that the actual rate of interest on
account of such  indebtedness is uniform  throughout the term hereof.  The terms
and  provisions  of this  paragraph  shall  control  and  supersede  every other
provision of all agreements between the Maker and the holder hereof.

     This Note shall be governed by and construed in accordance with the laws of
the State of Texas.

     All  references to the Maker herein shall,  and shall be deemed to, include
its  successors  and  assigns,  and all  covenants,  stipulations,  promises and
agreements  contained  herein by or on behalf of the Maker shall be binding upon
its successors and assigns, whether so expressed or not.



                           -----------------------------------------------------
                           MAKER


<PAGE>



                                    Exhibit D
                                       to
                 Seitel, Inc. 1998 Employee Stock Purchase Plan


                              September ____, 1998



Seitel, Inc.
50 Briar Hollow Road West
7th Floor
Houston, Texas 77027

Re: 1998 Employee Stock Purchase

Ladies and Gentlemen:


     I have on this date executed a promissory  note in the principal  amount of
$_________ (the "Note") as consideration for __________ shares (the "Shares") of
common stock, par value $0.01 per share, of Seitel,  Inc. (the  "Company"),  and
warrants to purchase  such Stock (the  "Warrants,"  and together with the Stock,
the "Securities")  purchased by me from the Company pursuant to the Seitel, Inc.
1998 Employee Stock Purchase Plan.

     Pursuant to this letter,  I hereby grant,  assign,  transfer and deliver to
the Company a security interest in the following property as security for all of
my obligations under the Note:

     (i)     the Shares;

     (ii)     stock powers executed in blank which are related to the Shares;

     (iii) any and all stock rights, rights to subscribe, liquidating dividends,
cash dividends, stock dividends and dividends paid in stock, securities or other
property  that I am or may hereafter  become  entitled to received on account of
the  Shares,  and  in the  event  that  I  receive  any  such  property,  I will
immediately  deliver same to the  Company;  provided,  however,  that I shall be
entitled  to receive and retain any such  property  so long as no default  shall
have occurred and be continuing under the Note; and

     (iv) the proceeds of any and all property  described in subparagraphs  (i),
(ii) or (iii) above.

     To perfect  this  security  interest,  I hereby  agree to deliver with this
letter the  certificate(s)  representing the Stock,  together with a stock power
executed in blank relating to the Stock, to the Chief  Financial  Officer of the
Company,  as escrow  agent,  to hold until such time as the Note shall have been
paid in full.

     In the event of a  default  under the Note,  the  Company  is hereby  fully
authorized and empowered,  at any time thereafter and from time to time, to sell
or otherwise dispose of the Shares to satisfy the remaining unpaid amounts under
the Note and any expenses associated with such satisfaction. Any excess proceeds
from the sale shall be returned to me. I shall remain liable for any deficiency.

     I understand  that to the extent that the Note is repaid,  the Company from
time to time  upon my  request  will take all  actions  as may be  necessary  to
release some of the Shares from this  security  agreement  and pledge so long as
both (i) the market value of the remaining Shares at the time of the release and
(ii) the average  market price of the remaining  Shares for the six months prior
thereto are equal to or not less than 100% of the outstanding  balance under the
Note.



                           -----------------------------------------------------
                           Employee


ACCEPTED AND AGREED TO:


SEITEL, INC.

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



<PAGE>


                                    Exhibit E
                                       to
                 Seitel, Inc. 1998 Employee Stock Purchase Plan

NEITHER THIS WARRANT NOR, IF THE WARRANT IS TRANSFERRED AS PERMITTED HEREIN, THE
SHARES OF  COMMON  STOCK  ISSUABLE  UPON  EXERCISE  OF THIS  WARRANT,  HAVE BEEN
REGISTERED  UNDER THE  SECURITIES  ACT OF 1933, AND NEITHER THIS WARRANT NOR THE
SHARES OF COMMON  STOCK  ISSUABLE  UPON  EXERCISE  OF THIS  WARRANT MAY BE SOLD,
TRANSFERRED,  PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF IN WHOLE OR IN PART
IN THE  ABSENCE  OF AN  EFFECTIVE  REGISTRATION  STATEMENT  UNDER SUCH ACT OR AN
OPINION OF COUNSEL REASONABLY  SATISFACTORY TO COUNSEL TO SEITEL,  INC., IN FORM
AND SUBSTANCE  REASONABLY  SATISFACTORY TO SEITEL,  INC., THAT AN EXEMPTION FROM
REGISTRATION UNDER SUCH ACT OR THE RULES AND REGULATIONS THEREUNDER IS AVAILABLE
WITH RESPECT TO THE PROPOSED  SALE,  TRANSFER,  PLEDGE,  HYPOTHECATION  OR OTHER
DISPOSITION.


                                  SEITEL, INC.

                    COMMON STOCK PURCHASE WARRANT CERTIFICATE
                   TO PURCHASE [BLANK] SHARES OF COMMON STOCK

Certificate No. ESP-____

     This Warrant Certificate  certifies that [Employee Name, Address,  and SSN]
is the registered holder ("Holder") of __________ Common Stock Purchase Warrants
(the "Warrants") to purchase shares of the $0.01 par value common stock ("Common
Stock") of SEITEL,  INC., a Delaware  corporation (the "Company").  Each Warrant
enables the Holder to purchase from the Company at any time until 5:00 p.m., New
York,  New  York,  local  time  on  _____________,   2003,  subject  to  earlier
termination as specified in Section 10 herein, one fully paid and non-assessable
share of Common Stock ("Share") upon  presentation and surrender of this Warrant
Certificate  and upon  payment of the  Exercise  Price per Share  determined  in
accordance  with the terms hereof.  Payment shall be made in lawful money of the
United  States of  America in cash  delivered  to the  Company at its  principal
office at 50 Briar  Hollow  Lane,  7th Floor  West,  Houston,  Texas  77027.  As
hereinafter  provided,  the Exercise Price and number of Shares purchasable upon
the exercise of the Warrants are subject to  modification or adjustment upon the
happening of certain events.

     THIS WARRANT IS NOT ASSIGNABLE OR TRANSFERABLE BY THE HOLDER EXCEPT BY WILL
OR THE LAWS OF  DESCENT  AND  DISTRIBUTION  UPON THE  HOLDER'S  DEATH OR, BY THE
ORIGINAL  PURCHASER OF THIS WARRANT  FROM THE  COMPANY,  TO AN IMMEDIATE  FAMILY
MEMBER OR A TRUST OR  BUSINESS  ENTITY  FORMED FOR THE  BENEFIT OF AN  IMMEDIATE
FAMILY MEMBER AS PROVIDED HEREIN.

1.   Upon surrender to the Company,  this Warrant  Certificate  may be exchanged
     for another Warrant Certificate or Warrant  Certificates  evidencing a like
     aggregate  number  of  Warrants.  If  this  Warrant  Certificate  shall  be
     exercised in part,  the Holder shall be entitled to receive upon  surrender
     hereof another Warrant Certificate or Warrant  Certificates  evidencing the
     number of Warrants not  exercised.  Subject to the provisions of Section 11
     below,  during the  lifetime of the Holder,  the  Warrants may be exercised
     only by the  Holder.  If the  Holder  dies or becomes  disabled  within the
     meaning  of Section  22(e)(3)  of the Code  prior to the  termination  date
     specified  herein  without  having  exercised  all  of  the  Warrants,  the
     remaining  Warrants  may be  exercised  to the extent the Holder could have
     exercised  the Warrants on the date of his death or  disability at any time
     prior to the expiration  hereof by (i) the Holder's  estate or a person who
     acquired the right to exercise the Warrants by bequest or inheritance or by
     reason of the death of the Holder in the event of the  Holder's  death,  or
     (ii) the Holder or his personal representative in the event of the Holder's
     disability,  subject to the other  terms of this  Warrant  Certificate  and
     applicable  laws,  rules and  regulations.  For  purposes  of this  Warrant
     Certificate,  the Company  shall  determine  the date of  disability of the
     Holder.

2.   No Holder  shall be deemed  to be the  holder of Common  Stock or any other
     securities  of the Company that may at any time be issuable on the exercise
     hereof for any purpose nor shall anything  contained herein be construed to
     confer upon the Holder any of the rights of a shareholder of the Company or
     any  right  to vote  for the  election  of  directors  or upon  any  matter
     submitted  to  shareholders  at any meeting  thereof or to give or withhold
     consent to any corporate action whether upon any  reorganization,  issuance
     of stock,  reclassification  or conversion  of stock,  change of par value,
     consolidation,  merger,  conveyance,  or otherwise) or to receive notice of
     meetings or to receive dividends or subscription  rights or otherwise until
     a Warrant shall have been exercised and the Common Stock  purchasable  upon
     the exercise thereof shall have become issuable.

3.   Each Holder consents and agrees with the Company and any other Holder that:

     a.    This Warrant  Certificate  is  exercisable in whole or in part by the
           Holder in person or by  attorney  duly  authorized  in writing at the
           principal office of the Company.

     b.    The Company may deem and treat the person in whose name this  Warrant
           Certificate  is  registered  as the  absolute  true and lawful  owner
           hereof for all purposes whatsoever.

     c.   Anything herein to the contrary notwithstanding, in no event shall the
          Company be obligated to issue Warrant  Certificates  evidencing  other
          than a whole number of Warrants or issue certificates evidencing other
          than a whole  number  of  Shares  upon the  exercise  of this  Warrant
          Certificate;  provided,  however,  that  the  Company  shall  pay with
          respect to any such  fraction  of a Share an amount of cash based upon
          the current  public market value (or book value,  if there shall be no
          public market value) for Shares  purchasable upon exercise hereof. For
          purposes of this Paragraph  3(c), the current public market value of a
          share  of  Common  Stock  on  any  date  shall  be  deemed  to be  the
          arithmetical  average of the  following  prices for such of the thirty
          (30)  business  days  immediately  preceding  such  day  as  shall  be
          available: (i) for any of such days on which the Common Stock shall be
          listed on a national securities exchange,  the last sale price on such
          day or, if there  shall have been no sale on such day,  the average of
          the closing bid and asked prices on such exchange on such day, or (ii)
          for any of such days on which the Common  Stock shall not be listed on
          a national  securities  exchange but shall be included in the National
          Association  of  Securities   Dealers   Automated   Quotation   System
          ("NASDAQ"),  the average of the  closing bid and asked  prices on such
          day quoted by brokers and dealers making a market in NASDAQ, furnished
          by any member of the New York Stock  Exchange  selected by the Company
          for that  purpose,  or (iii) for any of such days on which the  Common
          Stock  shall not be so listed on a  national  securities  exchange  or
          included  in NASDAQ  but shall be  quoted by three  brokers  regularly
          making a market in such  shares in the  over-the-counter  market,  the
          average of the closing bid and asked prices on such day,  furnished by
          any member of the New York Stock Exchange  selected by the Company for
          that purpose, or (iv) for any days on which the information  described
          in items (i), (ii) or (iii) above is  unavailable,  the book value per
          share of the Common Stock as determined in accordance  with  generally
          accepted accounting principles;  provided,  however, in its discretion
          the  Board of  Directors  may  make an  appropriate  reduction  in the
          "current  public  market  value"  based  upon any  applicable  trading
          restrictions to particular shares of Common Stock.

     d.    The Warrants are not  exercisable  until the Promissory Note given by
           the  Holder in payment  of a portion  of the  purchase  price for the
           Warrants shall have been paid in full.

4.   The Exercise Price per Share for the Warrants shall equal $____ per Share.

5.   The  Company  will pay any  documentary  stamp  taxes  attributable  to the
     initial  issuance of the Shares issuable upon the exercise of the Warrants;
     provided, however, that the Company shall not be required to pay any tax or
     taxes  which may be payable  in  respect of income or similar  taxes of the
     holder arising from such exercise or any transfer  involved in the issuance
     or delivery of any certificates for Shares in a name other than that of the
     Holder in  respect of which such  Shares are  issued,  and in such case the
     Company  shall not be  required  to issue or deliver  any  certificate  for
     Shares or any Warrant until the person  requesting the same has paid to the
     Company  the  amount  of  such  tax or  has  established  to the  Company's
     satisfaction that such tax has been paid.

6.   In case  the  Warrant  Certificate  shall be  mutilated,  lost,  stolen  or
     destroyed,  the  Company  may,  in its  discretion,  issue and  deliver  in
     exchange  and  substitution  for and  upon  cancellation  of the  mutilated
     Warrant  Certificate,  or in  lieu  of and  substitution  for  the  Warrant
     Certificate,  lost, stolen or destroyed,  a new Warrant Certificate of like
     tenor and  representing  an  equivalent  right or  interest,  but only upon
     receipt of  evidence  satisfactory  to the  Company of such loss,  theft or
     destruction and an indemnity, if requested, also satisfactory to it.

7.   The Company  warrants that there have been reserved,  and covenants that at
     all times in the future it shall keep  reserved,  out of the authorized and
     unissued  Common  Stock,  a number of Shares  sufficient to provide for the
     exercise of the rights or purchase represented by this Warrant Certificate.
     The Company  agrees that all Shares  issuable upon exercise of the Warrants
     shall be, at the time of  delivery  of the  certificates  for such  Shares,
     validly issued and outstanding,  fully paid and non assessable and that the
     issuance of such Shares will not give rise to preemptive rights in favor of
     existing shareholders.

8.   The number of shares of Common Stock  covered by this Warrant  Certificate,
     and the Exercise Price thereof,  shall be subject to such adjustment as the
     Board of Directors of the Company acting in good faith deems appropriate to
     reflect any stock dividend,  stock split,  share  combination,  exchange of
     shares,     recapitalization,     merger,    consolidation,     separation,
     reorganization, liquidation or the like, of or by the Company. In the event
     the Company  shall be a party to any  merger,  consolidation  or  corporate
     reorganization,  as the result of which the Company  shall be the surviving
     corporation,  the rights and duties of the Holder and the Company shall not
     be  affected  in any  manner.  In the event the  Company  shall sell all or
     substantially  all of  its  assets  or  shall  be a  party  to any  merger,
     consolidation  or  corporate  reorganization,  as the  result  of which the
     Company shall not be the surviving  corporation,  or in the event any other
     person  or  entity  may make a tender  or  exchange  offer for stock of the
     Company (the surviving  corporation,  purchaser,  or tendering  corporation
     being  collectively  referred to as the  "Purchaser",  and the  transaction
     being collectively referred to as the "Purchase"), then the Company may, at
     its election,  (a) reach an agreement with the Purchaser that the Purchaser
     will assume the obligations of the Company under this Warrant  Certificate;
     (b) reach an agreement  with the Purchaser  that the Purchaser will convert
     the Warrants  represented by this Warrant  Certificate  into warrants of at
     least  equal  value as to stock of the  Purchaser;  or (c) not  later  than
     thirty (30) days prior to the effective  date of the  Purchase,  notify the
     Holder of the proposed Purchase and afford to the Holder the right prior to
     such  Purchase to exercise any then  unexercised  portion of the  Warrants,
     which exercise may be contingent upon consummation of the Purchase.

9.   The  Warrants  may not be  exercised  in  whole  or in part  and no cash or
     certificates  representing  Shares  shall  be  delivered  if any  requisite
     approval  or  consent  of  any  government  authority  of any  kind  having
     jurisdiction  over the exercise of the Warrants or of any stock exchange on
     which the  Common  Stock is listed  shall not have been  secured or if such
     exercise of delivery  would cause any  violation  of any  applicable  laws,
     regulations  or  stock  exchange  rules,   including  but  not  limited  to
     applicable  Federal and State  securities  laws. The Holder of this Warrant
     Certificate, each permitted transferee hereof and any holder and transferee
     of any  Shares,  by his  acceptance  thereof,  agrees  that  (i) no  public
     distribution  of  Warrants  or  Shares  will be made  in  violation  of the
     Securities Act of 1933, as amended (the "Act"), and (ii) during such period
     as the delivery of a  prospectus  with respect to Warrants or Shares may be
     required by the Act, no public  distribution  of Warrants or Shares will be
     made in a manner or on terms  different from those set forth in, or without
     delivery of, a prospectus  then meeting the  requirements  of Section 10 of
     the Act and in compliance with all applicable  state  securities  laws. The
     Holder of this Warrant  Certificate  and each permitted  transferee  hereof
     further agrees that if any distribution of any of the Warrants or Shares is
     proposed to be made by them  otherwise  than by  delivery  of a  prospectus
     meeting the  requirements  of Section 10 of the Act,  such action  shall be
     taken  only after  submission  to the  Company  of an  opinion of  counsel,
     reasonably  satisfactory in form and substance to the Company's counsel, to
     the effect that the proposed  distribution  will not be in violation of the
     Act or of applicable state law. Furthermore, it shall be a condition to the
     transfer of the Warrants that any permitted  transferee  thereof deliver to
     the  Company  his  written  agreement  to accept and be bound by all of the
     terms and conditions in this Warrant Certificate.

10.  The Warrants shall terminate before the date specified on the first page of
     this Warrant  Certificate  upon the earlier of (i) five business days after
     the date of  termination  of  employment  if the original  purchaser of the
     Warrants  from the  Company  (the  "Original  Purchaser")  ceases  to be an
     employee of the Company or a Subsidiary of the Company for any reason other
     than for death,  disability  (within the meaning of Section 22(e)(3) of the
     Internal Revenue Code of 1986, as amended (the "Code")) or retirement after
     age 65, or (ii) one year after the death,  disability or  retirement  after
     age 65 of the  Original  Purchaser  if he ceases to be an  employee  of the
     Company or a  Subsidiary  because of his death,  disability  or  retirement
     after age 65.

11.  The Warrants shall not be transferable other than by will or by the laws of
     descent and  distribution,  except that the Warrants may be  transferred by
     the Original  Purchaser to members of the  Original  Purchaser's  immediate
     family who are U.S.  residents or to trusts or business entities formed for
     the benefit of members of the Original Purchaser's immediate family who are
     U.S.  residents.  As used herein,  immediate family means a parent,  child,
     grandchild, or spouse. A Warrant may not be subsequently transferred by the
     immediate  family  member (or the trust or business  entity  formed for the
     benefit of an immediate  family  member) of the Original  Purchaser to whom
     the Warrant is transferred other than by will or by the laws of descent and
     distribution. If a Warrant is transferred to an immediate family member (or
     a trust or business  entity  formed for the benefit of an immediate  family
     member),  the Company may require investment  representations upon exercise
     of the  Warrant  and may impose such  conditions  upon the  exercise of the
     Warrant as may be  required to comply  with  federal  and state  securities
     laws, and the Shares of Common Stock issuable upon exercise of a Warrant by
     such immediate  family member (or such trust or business  entity formed for
     the benefit of an immediate  family member) may be  "restricted  shares" as
     such  term is  defined  in Rule 144 under the  Securities  Act of 1933,  as
     amended,  and  may  contain  such  restrictive  legends  as may  be  deemed
     necessary by the Company.

12.  In the event  that the  Original  Purchaser  transfers  this  Warrant to an
     immediate  family member,  such  transferee  agrees and  acknowledges  that
     neither this Warrant nor the shares of Common Stock  issuable upon exercise
     of this Warrant have been  registered  under the Securities Act of 1933, as
     amended,  and neither this Warrant nor the shares of Common Stock  issuable
     upon  exercise  of  this  Warrant  may  be  sold,   transferred,   pledged,
     hypothecated or otherwise disposed of in whole or in part in the absence of
     an effective registration statement under such Act or an opinion of counsel
     reasonably  satisfactory  to counsel to the  Company in form and  substance
     reasonably  satisfactory to the Company that an exemption from registration
     under such Act or the rules and  regulations  thereunder is available  with
     respect to the proposed  sale,  transfer,  pledge,  hypothecation  or other
     disposition.


<PAGE>


     WITNESS the following signatures as of this ___ day of September, 1998.



                           SEITEL, INC.


                           By:    ______________________________________
                                  PAUL A. FRAME, President

                           By:    ______________________________________
                                  DEBRA D. VALICE, Secretary






<PAGE>


                                  PURCHASE FORM




TO: SEITEL, INC.                                                  DATE:



     The undersigned  hereby irrevocably elects to exercise the attached Warrant
Certificate,  Certificate  No.  ESP-  ____,  to the extent of (number of shares)
Shares of Common Stock,  $0.01 par value per share, of SEITEL,  INC., and hereby
makes payment of $_________ in payment of the aggregate exercise price thereof.



                   INSTRUCTIONS FOR REGISTRATION OF SECURITIES



Name:
             --------------------------------------
Address:
             --------------------------------------

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

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




                           By:
                                -----------------------------------------



                                 AMENDMENT NO. 4

     This  Amendment  No. 4 dated as of August 10, 1999  ("Agreement")  is among
Seitel,  Inc.,  a Delaware  corporation  ("Borrower");  the  Lenders (as defined
below)  executing this  Agreement;  and The First  National Bank of Chicago,  as
agent for the Lenders ("Agent").

                                  INTRODUCTION

     A. The Borrower, the Lenders, and the Agent are parties to the Seitel, Inc.
Revolving  Credit  Agreement  dated as of July 22, 1996, as amended by the First
Amendment  dated as of August 30, 1996, the Second  Amendment dated as of May 1,
1997,  and the Third  Amendment  dated as of March 16, 1998 (as so amended,  the
"Credit Agreement").

     B. The  Borrower,  the  Lenders,  and the Agent  desire to amend the Credit
Agreement in certain respects as set forth herein.

     THEREFORE,  the  Borrower,  the  Lenders,  and the  Agent  hereby  agree as
follows:

     Section  1.  Definitions;  References.  Unless  otherwise  defined  in this
Agreement,  terms  used  in this  Agreement  which  are  defined  in the  Credit
Agreement  shall  have  the  meanings  assigned  to  such  terms  in the  Credit
Agreement.

     Section 2.     Amendments.

     (a) In Article I of the Credit  Agreement  the  following  definitions  are
amended in their entirety to read as follows or added in alphabetical order:

     "Consolidated  Debt" means, as of any date of  determination,  the total of
all Debt of the Borrower and the  Restricted  Subsidiaries  outstanding  on such
date, after  eliminating all offsetting  debits and credits between the Borrower
and the Restricted Subsidiaries and all other items required to be eliminated in
the  course of the  preparation  of  consolidated  financial  statements  of the
Borrower and the Restricted  Subsidiaries  prepared in accordance with Agreement
Accounting  Principles;  provided  that  Consolidated  Debt  shall  not  include
Qualified Capital Obligations.

     "Consolidated Net Worth" means, at any time, the sum, without  duplication,
of (a) the  total  stockholders'  equity  which  would be shown in  consolidated
financial statements of the Borrower and the Restricted Subsidiaries prepared at
such time in accordance with Agreement  Accounting  Principles and (b) Qualified
Capital.

     "Net Proceeds of Qualified Capital" means, with respect to any period, cash
proceeds  (net of all costs and  out-of-pocket  expenses  incurred in connection
therewith  and in  connection  with the issuance  and sale of any related  Trust
Preferred Securities, including, without limitation, placement, underwriting and
brokerage  fees and expenses)  received by the Borrower  during such period from
the sale of all Qualified Junior Subordinated Notes.

     "Qualified  Capital"  means  the total  amount of  capital  in  respect  of
Qualified Junior  Subordinated Notes and the Trust Preferred  Securities related
thereto which would, on a consolidated basis, be shown in consolidated financial
statements  of the  Borrower  and the  Subsidiaries  prepared  at  such  time in
accordance with Agreement Accounting Principles, provided that in no event shall
the aggregate amount of Qualified Capital at any time exceed $125,000,000.

     "Qualified  Capital  Obligations"  means  obligations  of the  Borrower  in
respect  of  any  Qualified  Junior  Subordinated  Notes  and  Qualified  Junior
Subordinated Guaranties.

     "Qualified Junior Subordinated  Guaranty" means, in respect of any issue of
Trust  Preferred  Securities,  a Guaranty by the Borrower to the holders of such
Trust Preferred  Securities of (a) the payment of all preferred  cumulative cash
dividends  accumulating  thereon  and (b) the  payments  due on  liquidation  or
redemption  of such  Trust  Preferred  Securities,  but only in each case to the
extent of funds held by the Special  Purpose  Trust which shall have issued such
Trust Preferred  Securities,  and the obligations  under which Guaranty shall be
unsecured and rank subordinate and junior in right of payment to all Senior Debt
(including,  without limitation,  all Debt of the Borrower under this Agreement,
the Loan  Documents  and the Notes) to the same  extent and on the same terms as
the Qualified Junior  Subordinated  Notes issued by the Borrower to such Special
Purpose Trust are subordinated to Senior Debt.

     "Qualified  Junior  Subordinated  Notes"  means  any  notes  issued  by the
Borrower to a Special Purpose Trust in a principal  amount equal to the proceeds
received by such  Special  Purpose  Trust from the  issuance of Trust  Preferred
Securities  and  paid  by  such  Special   Purpose  Trust  to  the  Borrower  in
consideration  for such notes,  which notes shall (a) not mature,  or  otherwise
require the payment of any of the principal thereof,  prior to June 1, 2029, (b)
be subject to the right of the Borrower to defer the payment of interest thereon
at any  time or from  time to time  for a  period  of at  least  20  consecutive
quarterly  periods,  during which deferral period the Borrower shall not pay any
dividends  with  respect  to any of its  capital  stock  or pay  any  principal,
interest or other amounts owing in respect of any Qualified Capital  Obligations
or other Subordinated Debt, (c) be unsecured, (d) rank subordinate and junior in
right of payment to all Senior Debt (including,  without limitation, all Debt of
the Borrower  under this  Agreement,  the Loan Documents and the Notes) upon the
terms set forth in Exhibit A to the Amendment No. 4 dated as of August 10, 1999,
among the Borrower, the Lenders, and the Agent, and (e) when aggregated with all
other such notes,  not exceed  $125,000,000 in aggregate  outstanding  principal
amount.

     "Special Purpose Trust" means a statutory  business trust created under the
laws of the State of Delaware  pursuant to the filing of a certificate  of trust
with the Secretary of State of the State of Delaware, (a) the existence of which
shall be for the exclusive purpose of (i) issuing Trust Common Securities to the
Borrower and issuing and selling Trust Preferred  Securities to investors,  (ii)
using the proceeds from such Trust  Preferred  Securities  to acquire  Qualified
Junior  Subordinated  Notes and (iii)  engaging in only those  other  activities
necessary or incidental to the  foregoing,  (b) the sole assets of which will be
such Qualified  Junior  Subordinated  Notes and the proceeds thereof and (c) the
sole source of revenue of which will be  payments  under such  Qualified  Junior
Subordinated  Notes.  Notwithstanding  anything else herein, any Special Purpose
Trust shall be deemed to be an Unrestricted Subsidiary.

     "Subordinated  Debt" means any Debt or other  obligations  of the  Borrower
(including, without limitation, Qualified Capital Obligations) other than Senior
Debt.

     "Trust Common  Securities"  means,  in respect of a Special  Purpose Trust,
securities  issued by such Special Purpose Trust  representing  common undivided
beneficial  interests in the assets of such Special Purpose Trust, 100% of which
securities shall be legally and beneficially owned by the Borrower.

     "Trust Preferred  Securities" means, in respect of a Special Purpose Trust,
securities  issued by such Special Purpose Trust,  having a stated par value and
liquidation  value and  entitling  the holders  thereof to the  payment  (unless
deferred) of preferred  cumulative  cash  distributions  at a fixed annual rate,
representing  preferred  undivided  beneficial  interests  in the assets of such
Special  Purpose  Trust,  provided  that  at the  time of the  initial  issuance
thereof,  the Senior Notes shall receive an investment  grade rating from, or an
investment  grade rating of the Senior Notes shall be confirmed by, a nationally
recognized rating agency.

          (b)  Paragraph  (a) of Section 6.12 is amended in its entirety to read
     as follows:

     6.12 Restricted Payments and Restricted Investments.

          (a) Limitation.  The Borrower will not, and will not permit any of the
     Restricted Subsidiaries to, directly or indirectly,  declare, make or incur
     any  liability  to make any  Restricted  Payment or make or  authorize  any
     Restricted  Investment  unless  immediately  after  giving  effect  to such
     action:

               (i) the sum of (x) the aggregate amount of outstanding Restricted
          Investments  (valued  immediately  after  such  action),  plus (y) the
          aggregate  amount  of  Restricted  Payments  of the  Borrower  and the
          Restricted  Subsidiaries declared or made during the period commencing
          on the date of this Agreement,  and ending on the date such Restricted
          Payment or Restricted Investment is declared or made, inclusive, would
          not exceed the sum of

                    (A) $10,000,000, plus

                    (B) 50% of Consolidated Net Income for the period commencing
               January 1, 1995 and ending on the date such Restricted Payment or
               such Restricted  Investment is declared or made (or minus 100% of
               Consolidated  Net  Income  for such  period if  Consolidated  Net
               Income for such period is a loss), plus

                    (C) the aggregate  amount of Net Proceeds of Common Stock of
               the Borrower for such period, plus

                    (D)  the  aggregate  amount  of Net  Proceeds  of  Qualified
               Capital for such period; and

               (ii) the Borrower could incur, pursuant to Section 6.20, at least
          $1 of  additional  Debt  owing to a  Person  other  than a  Restricted
          Subsidiary; and

               (iii) no Default or Unmatured Default would exist.

     Section 3.  Representations  and  Warranties.  The Borrowers  represent and
warrant to the Agent and the Lenders that:

     (a) the  representations  and warranties set forth in the Credit  Agreement
are true and correct in all material  respects as of the date of this Agreement,
except to the extent any such  representation  or  warranty  is stated to relate
solely to an earlier  date,  in which case such  representation  or warranty was
true and correct in all material respects as of such earlier date;

     (b) (i) the  execution,  delivery,  and  performance of this Agreement have
been  duly  authorized  by  appropriate  proceedings,  and (ii)  this  Agreement
constitutes a legal, valid, and binding obligation of the Borrowers, enforceable
in  accordance  with its  terms,  except as limited  by  applicable  bankruptcy,
insolvency, reorganization,  moratorium, or similar laws affecting the rights of
creditors generally and general principles of equity; and

     (c) as of the  effectiveness  of this  Agreement,  no  Default  or Event of
Default has occurred and is continuing.

     Section 4.  Effectiveness.  This Agreement  shall become  effective and the
Credit  Agreement  shall be  amended  as  provided  in this  Agreement  upon the
occurrence of the following conditions precedent:

     (a) the Borrowers, the Agent, and the Required Lenders shall have delivered
duly and validly executed originals of this Agreement to the Agent; and

     (b) the  representations and warranties in this Agreement shall be true and
correct in all material respects.

     Section 5.     Effect on Loan Documents.

     (a) Except as amended herein,  the Credit  Agreement and the Loan Documents
remain in full force and effect as originally  executed and amended  heretofore.
Nothing  herein  shall act as a waiver of any of the Agent's or Lenders'  rights
under the Loan  Documents,  as amended,  including  the waiver of any Default or
Unmatured Default, however denominated.

     (b) This Agreement is a Loan Document for the purposes of the provisions of
the  other  Loan  Documents.  Without  limiting  the  foregoing,  any  breach of
representations, warranties, and covenants under this Agreement may be a Default
or Unmatured Default under other Loan Documents.

     Section 6.  Assignment.  Bank One, Texas,  N.A. ("Bank One") hereby assigns
and delegates to The First National Bank of Chicago ("First Chicago")  effective
as of the date  hereof  all of its  rights  and  obligations  under  the  Credit
Agreement,  and First Chicago hereby accepts such  assignment and delegation and
agrees to assume all of Bank One's obligations under the Credit Agreement.  Bank
One's  rights  under  Section 9.7 of the Credit  Agreement  shall  survive  this
assignment.  The Borrower  agrees,  at First Chicago's  request,  to execute and
deliver a  replacement  Note to First  Chicago in the amount of First  Chicago's
Commitment after giving effect to this assignment.

     Section 7. Choice of Law. This Agreement shall be governed by and construed
and enforced in accordance with the laws of the State of Illinois.

     Section  8.  Counterparts.  This  Agreement  may be signed in any number of
counterparts, each of which shall be an original.


<PAGE>


       EXECUTED as of the date first above written.


                           SEITEL, INC.



                           By:         /s/Debra D. Valice
                                       -----------------------------------------
                           Name:       Debra D. Valice
                           Title:      Chief Financial Officer


                           THE FIRST NATIONAL BANK OF
                           CHICAGO, individually and as Agent



                           By:         /s/Helen A. Carr
                                       -----------------------------------------
                           Name:       Helen A. Carr
                           Title:      First Vice President


                           BANK ONE, TEXAS, N.A.



                           By:         /s/J.P. Garcia
                                       -----------------------------------------
                           Name:       J.P. Garcia
                           Title:      Assistant Vice President






<PAGE>


               ACKNOWLEDGMENT AND CONSENT BY SUBSIDIARY GUARANTORS

     Each of the undersigned  Subsidiary Guarantors (i) acknowledges its receipt
of a copy of and  hereby  consents  to all of the  terms and  conditions  of the
foregoing  Amendment  No.  4  and  (ii)  reaffirms  its  obligations  under  the
Subsidiary  Guaranty  dated as of July 22,  1996 in favor of The First  National
Bank of Chicago, as agent.

                           SEITEL DATA CORP.
                           SEITEL DELAWARE, INC.
                           SEITEL MANAGEMENT, INC.
                           SEITEL GEOPHYSICAL, INC.
                           DDD ENERGY, INC.
                           SEITEL GAS & ENERGY CORP.
                           SEITEL POWER CORP.
                           SEITEL NATURAL GAS, INC.
                           MATRIX GEOPHYSICAL, INC.
                           EXSOL, INC.
                           DATATEL, INC.
                           SEITEL OFFSHORE CORP.
                           GEO-BANK, INC.
                           ALTERNATIVE COMMUNICATIONS
                           ENTERPRISES, INC.
                           SEITEL INTERNATIONAL, INC.
                           AFRICAN GEOPHYSICAL, INC.



                           By:         /s/Debra D. Valice
                                       -----------------------------------------
                           Name:       Debra D. Valice
                           Title:      Authorized Officer


                                        SEITEL DATA LTD.

                                        By:         SEITEL DELAWARE, INC.,
                                                    its general partner



                                        By:         /s/Debra D. Valice
                                       -----------------------------------------
                                        Name:       Debra D.Valice
                                        Title:      Vice President






<PAGE>


                                    EXHIBIT A

                               Subordination Terms

     Note:      The term "Securities"  refers to the instruments  evidencing the
                debt subordinated by the following provisions; the term "Holder"
                refers to a holder of Securities.

     SECTION [1.01].     Securities Subordinate to Senior Indebtedness

     The Securities shall be subordinated to Senior Indebtedness as set forth in
this  Article  [One].  The Company  covenants  and agrees,  and each Holder of a
Security of any series by such Holder's  acceptance  thereof likewise  covenants
and agrees,  that, to the extent and in the manner hereinafter set forth in this
Article [One], the indebtedness represented by the Securities of such series and
the payment of the principal amount, interest,  premium (if any), and such other
amounts,  if any,  payable in respect of each and all of the  Securities of such
series are hereby  expressly made subordinate and subject in right of payment to
the prior payment in full of all Senior Indebtedness; provided, however, that no
provision of this Article [One] shall  prevent the  occurrence of any default or
Event of Default hereunder.

     "Credit  Agreement"  means the Revolving  Credit Agreement dated as of July
27, 1996 among The First National Bank of Chicago,  as agent,  the lenders party
thereto,  and the Company,  as amended and as the same may be further amended or
restated in whole or in part from time to time.

     "Senior Notes" means,  collectively,  (i) (a) the Company's  7.17% Series A
Senior Notes due December 30, 2001 in the original aggregate principal amount of
$25,000,000, (b) the Company's 7.17% Series B Senior Notes due December 30, 2002
in the original aggregate principal amount of $27,500,000, and (c) the Company's
Series C Senior Notes due December 30, 2002 in the original aggregate  principal
amount of $22,500,000,  in each case,  issued pursuant to separate Note Purchase
Agreements,  dated as of December 28, 1995, as such notes and  agreements may be
amended  from time to time,  and (ii) (a) the  Company's  7.03%  Series D Senior
Notes due  February  15,  2004 in the  original  aggregate  principal  amount of
$20,000,000, (b) the Company's 7.28% Series E Senior Notes due February 15, 2009
in the original aggregate principal amount of $75,000,000, and (c) the Company's
Series F Senior Notes due February 15, 2009 in the original aggregate  principal
amount of $43,000,000,  in each case,  issued pursuant to separate Note Purchase
Agreements,  dated as of February 12, 1999, as such notes and  agreements may be
amended from time to time.

     "Senior  Indebtedness"  means the  principal of (and premium or  make-whole
amount, if any) and interest on (including interest,  if any, accruing after the
filing  of  a  petition  initiating  any  proceeding  pursuant  to  any  Federal
bankruptcy law or any other  applicable  Federal or State law) and other amounts
due on or in connection  with the Senior Notes,  the Credit  Agreement,  and any
Indebtedness  of the Company  incurred,  assumed or  guaranteed  by the Company,
whether outstanding on the date of the Indenture or thereafter incurred, assumed
or  guaranteed  and  all  renewals,   extensions  and  refundings  of  any  such
Indebtedness  of the Company;  provided,  however,  that the following  will not
constitute Senior Indebtedness:

     (a) any Indebtedness of the Company as to which, in the instrument creating
the same or evidencing the same or pursuant to which the same is outstanding, it
is  expressly   provided  that  such   Indebtedness  of  the  Company  shall  be
subordinated to or pari passu with the Securities;

     (b)     Indebtedness of the Company in respect of the Securities;

     (c) any  Indebtedness of the Company  constituting  trade accounts  payable
arising in the ordinary course of business;

     (d) any  Indebtedness of the Company  initially  issued to any other [trust
which  issues  preferred  securities  or other  securities  similar to preferred
securities]; and

     (e) any Indebtedness of the Company to any Subsidiary of the Company, other
than a trust referred to in the preceding clause (d).

     SECTION [1.02].  Payment Over of Proceeds upon Dissolution, Etc.

     Upon any distribution of assets of the Company in the event of

     (a) any insolvency or bankruptcy case or proceeding,  or any  receivership,
liquidation,  reorganization  or other  similar case or proceeding in connection
therewith,  relative  to the  Company or to its  creditors,  as such,  or to its
assets, or

     (b) any  liquidation,  dissolution  or  other  winding  up of the  Company,
whether  voluntary or  involuntary  and whether or not  involving  insolvency or
bankruptcy, or

     (c) any assignment for the benefit of creditors or any other marshalling of
assets and liabilities of the Company,

     then and in such event:

     (1) the holders of Senior Indebtedness shall be entitled to receive payment
in full of all  amounts  due or to become  due on or in  respect  of all  Senior
Indebtedness,  or provision  shall be made for such payment in cash,  before the
Holders of the  Securities  of any series are entitled to receive any payment on
account of the  principal  amount,  interest,  premium  (if any),  or such other
amounts,  if any, as may be provided  for in respect of the  Securities  of such
series; and

     (2) any  payment or  distribution  of assets of the  Company of any kind or
character,  whether in cash, property or securities, by set-off or otherwise, to
which the Holders or the Trustee  would be entitled  but for the  provisions  of
this Article  [One],  including  any such payment or  distribution  which may be
payable or deliverable by reason of the payment of any other Indebtedness of the
Company  being  subordinated  to the payment of the  Securities  of such series,
shall be paid by the  liquidating  trustee or agent or other person  making such
payment  or  distribution,  whether a  trustee  in  bankruptcy,  a  receiver  or
liquidating trustee or otherwise, directly to the holders of Senior Indebtedness
or their  representative or  representatives or to the trustee or trustees under
any  indenture  under  which  any  instruments  evidencing  any of  such  Senior
Indebtedness may have been issued,  ratably  according to the aggregate  amounts
remaining  unpaid on account of the  principal  of,  and  premium or  make-whole
amount,  if any, and interest on the Senior  Indebtedness held or represented by
each, to the extent necessary to make payment in full of all Senior Indebtedness
remaining unpaid,  after giving affect to any concurrent payment or distribution
to the holders of such Senior Indebtedness.

     In the event that, notwithstanding the foregoing provisions of this Section
[1.02],  the Trustee or the Holder of any Security of any series  shall  receive
any payment or  distribution  of assets of the Company of any kind or character,
whether  in  cash,  property  or  securities,  including  any  such  payment  or
distribution which may be payable or deliverable by reason of the payment of any
other  Indebtedness  of the  Company  being  subordinated  to the payment of the
Securities  of such series,  before all Senior  Indebtedness  is paid in full or
payment  thereof  provided for, and if such fact shall then have been made known
to the  Trustee as  provided  in Section  [1.11],  or, as the case may be,  such
Holder,  then and in such event such payment or distribution  shall be paid over
or  delivered  forthwith  to the trustee in  bankruptcy,  receiver,  liquidating
trustee,   custodian,   assignee,  agent  or  other  person  making  payment  or
distribution  of assets of the  Company  for  application  to the payment of all
Senior Indebtedness  remaining unpaid, to the extent necessary to pay all Senior
Indebtedness  in  full,  after  giving  effect  to  any  concurrent  payment  or
distribution to or for the holders of Senior Indebtedness.

     For  purposes of this  Article  [One] only,  the words  "cash,  property or
securities," or any combination  thereof,  shall be deemed not to include shares
of capital stock of the Company as reorganized  or readjusted,  or securities of
the Company or any other corporation provided for by a plan of reorganization or
readjustment  the  payment  of which  is  subordinated,  at least to the  extent
provided in this Article [One] with respect to the Securities, to the payment of
all  Senior  Indebtedness  which  may  at the  time  be  outstanding  and to any
securities issued to the holders of Senior Indebtedness in respect of the Senior
Indebtedness under any such plan of reorganization or readjustment.

     SECTION [1.03].  Prior Payment to Senior  Indebtedness upon Acceleration of
Securities.

     In the event that any Securities of any series are declared due and payable
before  their  [Stated  Maturity],  then and in such event the holders of Senior
Indebtedness  shall be entitled to receive payment in full of all amounts due or
to become due on or in respect of all Senior  Indebtedness or provision shall be
made for such  payment in cash,  before the  Holders of the  Securities  of such
series are entitled to receive any payment  (including  any payment which may be
payable by reason of the payment of any other  indebtedness of the Company being
subordinated  to the payment of the Securities of such series) by the Company on
account  of the  principal  of (or  premium  or  make-whole  amount,  if any) or
interest  or other  amounts on  Securities  of such  series or on account of the
purchase or other acquisition of Securities of such series.

     In the event that,  notwithstanding  the foregoing,  the Company shall make
any  payment  to the  Trustee  or the  Holder of any  Securities  of any  series
prohibited by the foregoing provisions of this Section [1.03], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

     The  provisions of this Section  [1.03] shall not apply to any payment with
respect to which Section [1.02] would be applicable.

     SECTION [1.04].  Default in Senior Indebtedness.

     In the event and during the  continuation  of any default by the Company in
the payment of principal,  premium, if any, interest or any other payment due on
any  Senior  Indebtedness  of the  Company,  as the  case  may  be,  beyond  any
applicable grace period with respect thereto,  or in the event that the maturity
of any Senior  Indebtedness of the Company has been  accelerated  because of any
default,  then,  in any such case,  no payment shall be made by the Company with
respect to the principal (including  redemption payments, if any) of, premium or
make-whole  amount, if any, or interest or other amounts on the Securities until
such default is cured or waived or ceases to exist or any such  acceleration  or
demand for payment has been rescinded.

     In the event that,  notwithstanding  the foregoing,  the Company shall make
any  payment  to the  Trustee  or the  Holder of any  Securities  of any  series
prohibited by the foregoing provisions of this Section [1.04], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

     The  provisions of this Section  [1.04] shall not apply to any payment with
respect to which Section [1.02] would be applicable.

     SECTION [1.05].  Limitations on Acceleration and Enforcement.

     At any time  when the  Company  may not make  payments  in  respect  of the
Securities  as a result  of the  application  of  Section  [1.04],  no Holder of
Securities will:

     (a) accelerate or cause or permit the  acceleration  of the maturity of any
of the Securities; or

     (b) commence,  cause the  commencement  of,  participate  in or support any
action or  proceeding  (whether  at law or in  equity)  against  the  Company to
recover all or any part of the indebtedness represented by the Securities or any
action to commence or prosecute any bankruptcy or similar  proceeding in respect
of the Company unless the holders of at least a majority in principal  amount of
the Senior Notes at the time  outstanding  (exclusive of Senior Notes then owned
by the Company or any of its  subsidiaries  or affiliates)  shall have agreed in
writing in advance to, and shall have joined in, such proceedings.

     SECTION [1.06].  Payment Permitted if No Default.

     Nothing  contained in this Article [One] or elsewhere in this  Indenture or
in any of the  Securities  shall  prevent  (a) the  Company,  at any time except
during the pendency of any case, proceeding,  dissolution,  liquidation or other
winding up,  assignment  for the benefit of  creditors or other  marshalling  of
assets and liabilities of the Company referred to in Section [1.02] or under the
conditions  described in Sections [1.03] or [1.04],  from making payments at any
time of the principal amount,  interest or such other amounts, if any, as may be
provided  for  in  this  Indenture,  as the  case  may  be,  in  respect  of the
Securities, or (b) the application by the Trustee or the retention by any Holder
of any money  deposited with it hereunder to the payment of or on account of the
principal amount, interest or such other amounts, if any, as may be provided for
in this  Indenture,  as the case may be, in  respect  of the  Securities  if the
Trustee did not have, at the time provided in the proviso to the first paragraph
of Section  [1.11],  notice that such payment would have been  prohibited by the
provisions of this Article [One].

     SECTION [1.07].  Subrogation Rights of Holders of Senior Indebtedness.

     Subject to the payment in full of all Senior  Indebtedness,  the Holders of
the  Securities  of any series shall be subrogated to the extent of the payments
or distributions made to the holders of such Senior Indebtedness pursuant to the
provisions  of this  Article  [One] to the rights of the  holders of such Senior
Indebtedness  to  receive  payments  or  distributions  of  cash,   property  or
securities  applicable to the Senior  Indebtedness  until the principal  amount,
interest or such other amounts,  if any, as provided for in this  Indenture,  as
the case may be, in respect of the  Securities  of such series  shall be paid in
full.  For purposes of such  subrogation,  no payments or  distributions  to the
holders of the Senior  Indebtedness of any cash, property or securities to which
the Holders of the  Securities  of such series or the Trustee  would be entitled
except for the provisions of this Article [One], and no payments pursuant to the
provisions  of this  Article  [One] to the  Company or to the  holders of Senior
Indebtedness by Holders of the Securities of such series or the Trustee,  shall,
as between the Company,  its creditors other than holders of Senior Indebtedness
and the Holders of the  Securities of such series,  be deemed to be a payment or
distribution by the Company to or on account of the Senior Indebtedness.

     SECTION [1.08].  Provision Solely to Define Relative Rights.

     The  provisions of this Article  [One] are and are intended  solely for the
purpose of defining the relative  rights of the Holders of the Securities of any
series, on one hand, and the holders of Senior Indebtedness,  on the other hand.
Nothing contained in this Article [One] or elsewhere in this Indenture or in the
Securities of any series is intended to or shall:

     (a) impair,  as between the  Company and the Holders of the  Securities  of
such series, the obligation of the Company, which is absolute and unconditional,
to pay to the Holders of the  Securities  of such series the  principal  amount,
interest  or  such  other  amounts,  if  any,  as may be  provided  for in  this
Indenture,  as the case may be, in respect of the  Securities  of such series as
and when the same shall become due and payable in  accordance  with the terms of
the  Securities  of such  series and this  Indenture  and which,  subject to the
rights  under  this  Article  [One] of the  holders of Senior  Indebtedness,  is
intended to rank equally with all other general obligations of the Company; or

     (b) affect the  relative  rights  against the Company of the Holders of the
Securities  of such series and  creditors  of the Company  other than holders of
Senior Indebtedness; or

     (c) prevent  the Trustee or the Holder of any  Security of such series from
exercising all remedies otherwise permitted by applicable law upon default under
this Indenture,  subject to the rights,  if any, under this Article [One] of the
holders of Senior Indebtedness to receive cash, property or securities otherwise
payable or deliverable to the Trustee or such Holder.

     SECTION [1.09].  Trustee to Effectuate Subordination.

     Each Holder of a Security by such Holder's  acceptance  thereof  authorizes
and directs the  Trustee on such  Holder's  behalf to take such action as may be
necessary  or  appropriate  to  effectuate  the  subordination  provided in this
Article  [One] and appoints the Trustee such Holder's  attorney-in-fact  for any
and all such purposes.

     SECTION [1.10].  No Waiver of Subordination Provision.

     No right of any  present  or future  holder of any Senior  Indebtedness  to
enforce  subordination  as  herein  provided  shall  at any  time  in any way be
prejudiced  or  impaired by any act or failure to act on the part of the Company
or by any act or failure to act, by any such holder,  or by any noncompliance by
the  Company  with  the  terms,  provisions  and  covenants  of this  Indenture,
regardless  of any  knowledge  thereof any such holder may have or be  otherwise
charged with.

     Without in any way limiting the generality of the foregoing paragraph,  the
holders of Senior  Indebtedness may, at any time and from time to time,  without
the consent of, or notice to, the  Trustee or the Holders of the  Securities  of
any series, without incurring responsibility to the Holders of the Securities of
such series and without  impairing or releasing  the  subordination  provided in
this Article [One] or the obligations hereunder of the Holders of the Securities
of such series to the holders of Senior Indebtedness,  do any one or more of the
following:  (i) change the manner,  place or terms of payment or extend the time
of  payment  of,  or  renew  or  alter,   or  increase  the  amount  of,  Senior
Indebtedness, or otherwise amend or supplement in any manner Senior Indebtedness
or any  instrument  evidencing  the same or any  agreement  under  which  Senior
Indebtedness is outstanding;  (ii) sell, exchange,  release or otherwise dispose
of or deal with any property  pledged,  mortgaged or otherwise  securing  Senior
Indebtedness;  (iii)  release any person liable in any manner for the payment or
collection of Senior Indebtedness;  (iv) exercise or refrain from exercising any
rights  against the Company or any other person;  and (v) apply any sums paid in
respect of Senior  Indebtedness to Senior  Indebtedness,  regardless of who made
such payment or how such payment was realized.

     SECTION [1.11].  Notice to Trustee.

     The  Company  shall give prompt  written  notice to the Trustee of any fact
known to the Company which would prohibit the making of any payment to or by the
Trustee in respect of the Securities of any series.  Failure to give such notice
shall not affect the  subordination  of the  Securities of such series to Senior
Indebtedness.  Notwithstanding the provisions of this Article [One] or any other
provision of this Indenture,  the Trustee shall not be charged with knowledge of
the existence of any facts which would  prohibit the making of any payment to or
by the Trustee in respect of the Securities of such series, unless and until the
Trustee shall have received  written notice thereof in the manner  prescribed by
this Indenture from the Company or a holder of Senior  Indebtedness  or from any
trustee or agent therefor; and, prior to the receipt of any such written notice,
the Trustee,  subject to the  provisions  of Section  [regarding  the duties and
responsibilities  of the  Trustee],  shall be entitled in all respects to assume
that no such facts exist; provided,  however, that if the Trustee shall not have
received, at least three Business Days prior to the date upon which by the terms
hereof  any  money  may  become  payable  for any  purpose  (including,  without
limitation, the payment of the principal amount, interest, or such other amounts
as may be provided for in this Indenture in respect of any Security), the notice
with respect to such money provided for in this Section [1.11],  then,  anything
herein  contained to the contrary  notwithstanding,  the Trustee  shall have the
full  power and  authority  to  receive  such money and to apply the same to the
purpose  for which  such money was  received  and shall not be  affected  by any
notice to the contrary  which may be received by it within three  Business  Days
prior to such date.

     Subject  to  the   provisions   of  Section   [regarding   the  duties  and
responsibilities  of the Trustee],  the Trustee shall be entitled to rely on the
delivery  to it of a written  notice by a person  representing  himself  to be a
holder of Senior  Indebtedness  (or a trustee or agent on behalf of such holder)
to establish that such notice has been given by a holder of Senior  Indebtedness
(or a  trustee  or agent on behalf of any such  holder).  In the event  that the
Trustee  determines in good faith that further evidence is required with respect
to the right of any person as a holder of Senior  Indebtedness to participate in
any payment or  distribution  pursuant to this  Article  [One],  the Trustee may
request such person to furnish  evidence to the reasonable  satisfaction  of the
Trustee as to the amount of Senior  Indebtedness held by such person, the extent
to which such person is entitled to participate in such payment or  distribution
and any other facts  pertinent  to the rights of such person  under this Article
[One], and if such evidence is not furnished,  the Trustee may defer any payment
which it may be required to make for the benefit of such person  pursuant to the
terms of this Indenture  pending judicial  determination as to the right of such
person to receive such payment.

     SECTION  [1.12].  Reliance on Judicial  Order or Certificate of Liquidating
Agent.

     Upon any payment or  distribution  of assets of the Company  referred to in
this Article [One], the Trustee, subject to the provisions of Section [regarding
the  duties  and  responsibilities  of the  Trustee],  and  the  Holders  of the
Securities  of any  series  shall be  entitled  to rely upon any order or decree
entered  by any  court  of  competent  jurisdiction  in which  such  insolvency,
bankruptcy, receivership, liquidation,  reorganization,  dissolution, winding up
or similar case or  proceeding is pending,  or a  certificate  of the trustee in
bankruptcy,  liquidating trustee, custodian,  receiver, assignee for the benefit
of  creditors,  agent or other  person  making  such  payment  or  distribution,
delivered to the Trustee or to the Holders of Securities of such series, for the
purpose of ascertaining  the persons  entitled to participate in such payment or
distribution,  the holders of Senior  Indebtedness and other indebtedness of the
Company,  the amount thereof or payable  thereon,  the amount or amounts paid or
distributed  thereon and all other facts  pertinent  thereto or to this  Article
[One].

     SECTION [1.13].  Trustee Not Fiduciary for Holders of Senior Indebtedness.

     The Trustee shall be deemed not to owe any fiduciary duty to the holders of
Senior  Indebtedness.  The Trustee  shall not be charged  with  knowledge of the
existence of Senior  Indebtedness  (other than the Senior Notes) or of any facts
that would prohibit any payment hereunder unless the Trustee shall have received
notice thereof in the manner  prescribed by this Indenture.  With respect to the
holders of Senior Indebtedness,  the Trustee undertakes to perform or to observe
only such of its covenants or obligation as are  specifically  set forth in this
Article [One] and no implied covenants or obligations with respect to holders of
Senior Indebtedness shall be read into this Indenture against the Trustee.

     SECTION  [1.14].  Rights of  Trustee  as  Holder  of  Senior  Indebtedness;
Preservation of Trustee=s Rights.

     The Trustee in its individual  capacity shall be entitled to all the rights
set forth in this Article  [One] with respect to any Senior  Indebtedness  which
may at any time be held by it, to the same extent as any other  holder of Senior
Indebtedness,  and nothing in this Indenture shall deprive the Trustee of any of
its rights as such holder.

     Nothing in this Article [One] shall apply to claims of, or payments to, the
Trustee  under or  pursuant  to Section  [concerning  fees and  expenses  of the
Trustee].

     SECTION [1.15].  Article [One] Applicable to Paying Agents.

     The term  "Trustee" as used in this Article [One] shall (unless the context
otherwise  requires) be construed as extending to and including the Paying Agent
within its meaning as fully for all intents and  purposes as if the Paying Agent
were named in this  Article  [One] in  addition  to or in place of the  Trustee;
provided,  however,  that  Sections  [1.11]  and  [1.13]  shall not apply to the
Company or any Affiliate of the Company if it or such  Affiliate  acts as Paying
Agent.



                   FIRST AMENDMENT TO NOTE PURCHASE AGREEMENT

         THIS FIRST AMENDMENT,  dated as of July 14, 1999 (the "Amendment"),  to
the separate Note Purchase  Agreements,  dated as of February 12, 1999, is among
Seitel,  Inc. (the "Company") and each of the institutions  which is a signatory
to this Amendment (collectively, the "Noteholders").

                                    RECITALS:

         A. The Company and each of the Noteholders have heretofore entered into
separate Note Purchase  Agreements dated as of February 12, 1999  (collectively,
as  amended  and in  effect  immediately  prior  to the  effectiveness  of  this
Amendment,  the  "Existing  Note  Purchase  Agreement"),  pursuant  to which the
Company issued: (a) $20,000,000 aggregate principal amount of its 7.03% Series D
Senior  Notes due  February  15, 2004 (the  "Series D Notes"),  (b)  $75,000,000
aggregate  principal  amount of its 7.28% Series E Senior Notes due February 15,
2009 (the "Series E Notes"),  and (c)  $43,000,000  of its 7.43% Series F Senior
Notes due February 15, 2009 (the "Series F Notes",  and together with the Series
D Notes and the Series E Notes, the "Notes").

         B.  Capitalized  terms used herein shall have the  respective  meanings
ascribed  thereto in the Existing Note Purchase  Agreement unless herein defined
or the context shall otherwise require.

         C. The Company  and the  Noteholders  now desire to amend the  Existing
Note Purchase Agreement in the respects,  but only in the respects,  hereinafter
set forth.

         D. All  requirements of law have been fully complied with and all other
acts and things  necessary  to make this  Amendment  a legal,  valid and binding
instrument  according to its terms for the purposes  herein  expressed have been
done or performed.

         NOW,  THEREFORE,  for good and valuable  consideration  the receipt and
sufficiency of which are hereby acknowledged, the Company and the Noteholders do
hereby agree as follows:

SECTION 1. AMENDMENTS.

         1.1 Amendment to Section 10.7(a).  Section 10.7(a) of the Existing Note
Purchase Agreement is hereby amended and restated in its entirety as follows:

         "10.7    Restricted Payments and Restricted Investments.

                           (a)  Limitation.  The Company  will not, and will not
                  permit any of the  Restricted  Subsidiaries  to,  directly  or
                  indirectly,  declare,  make or incur any liability to make any
                  Restricted   Payment  or  make  or  authorize  any  Restricted
                  Investment  unless  immediately  after  giving  effect to such
                  action:

                                    (i) the sum of (x) the  aggregate  amount of
                           outstanding     Restricted     Investments    (valued
                           immediately   after  such   action),   plus  (y)  the
                           aggregate  amount  of  Restricted   Payments  of  the
                           Company and the Restricted  Subsidiaries  declared or
                           made  during the  period  commencing  on the  Closing
                           Date, and ending on the date such Restricted  Payment
                           or   Restricted   Investment  is  declared  or  made,
                           inclusive, would not exceed the sum of

                                            (A)  Thirty-Five   Million   Dollars
                                   ($35,000,000), plus

                                            (B)   fifty    percent    (50%)   of
                                    Consolidated   Net  Income  for  the  period
                                    commencing January 1, 1999 and ending on the
                                    date  such   Restricted   Payment   or  such
                                    Restricted  Investment  is  declared or made
                                    (or minus  100% of  Consolidated  Net Income
                                    for such period if  Consolidated  Net Income
                                    for such period is a loss), plus

                                            (C)  the  aggregate  amount  of  Net
                                    Proceeds of Common  Stock of the Company for
                                    such period, plus

                                            (D)  the  aggregate  amount  of  Net
                                    Proceeds  of  Qualified   Capital  for  such
                                    period; and

                           (ii) the  Company  could  incur,  pursuant to Section
                  10.3, at least One Dollar ($1) of  additional  Debt owing to a
                  Person other than a Restricted Subsidiary; and

                           (iii) no Default or Event of Default would exist."


<PAGE>

         1.2  Amendment to Schedule B.  Schedule B to the Existing Note Purchase
Agreement is hereby  amended to modify in their  entirety or add,  each in their
proper alphabetical order, the following defined terms:

                  "Consolidated  Debt -- means, as of any date of determination,
         the total of all Debt of the  Company and the  Restricted  Subsidiaries
         outstanding on such date, after  eliminating all offsetting  debits and
         credits  between the Company and the  Restricted  Subsidiaries  and all
         other items required to be eliminated in the course of the  preparation
         of consolidated  financial statements of the Company and the Restricted
         Subsidiaries in accordance with GAAP,  provided that  Consolidated Debt
         shall not include Qualified Capital Obligations."

                  "Consolidated  Net  Worth  --  means,  at any  time,  the sum,
         without duplication,  of (a) the total stockholders' equity which would
         be shown in  consolidated  financial  statements of the Company and the
         Restricted  Subsidiaries  prepared at such time in accordance with GAAP
         plus (b) Qualified Capital."

                  "Net Proceeds of Qualified  Capital -- means,  with respect to
         any period, cash proceeds (net of all costs and out-of-pocket  expenses
         incurred in connection  therewith  and in connection  with the issuance
         and sale of any related Trust Preferred Securities,  including, without
         limitation,  placement,  underwriting  and brokerage fees and expenses)
         received  by the  Company  during  such  period  from  the  sale of all
         Qualified Junior Subordinated Notes."

                  "Qualified  Capital  -- means the total  amount of  capital in
         respect of Qualified Junior  Subordinated Notes and the Trust Preferred
         Securities  related  thereto which would,  on a consolidated  basis, be
         shown in  consolidated  financial  statements  of the  Company  and the
         Subsidiaries  prepared at such time in accordance  with GAAP,  provided
         that in no event shall the aggregate amount of Qualified Capital at any
         time exceed One Hundred Twenty-Five Million Dollars ($125,000,000)."

                  "Qualified  Capital  Obligations  -- means  obligations of the
         Company in  respect  of any  Qualified  Junior  Subordinated  Notes and
         Qualified Junior Subordinated Guaranties."

                  "Qualified Junior  Subordinated  Guaranty -- means, in respect
         of any issue of Trust Preferred  Securities,  a Guaranty by the Company
         to the holders of such Trust Preferred Securities of (a) the payment of
         all preferred  cumulative cash dividends  accumulating  thereon and (b)
         the payments due on liquidation  or redemption of such Trust  Preferred
         Securities,  but only in each case to the  extent of funds  held by the
         Special  Purpose  Trust which  shall have  issued such Trust  Preferred
         Securities, and the obligations under which Guaranty shall be unsecured
         and rank  subordinate and junior in right of payment to all Senior Debt
         (including,  without  limitation,  all Debt of the  Company  under this
         Agreement,  the Other  Agreements and the Notes) to the same extent and
         on the same terms as the Qualified Junior  Subordinated Notes issued by
         the Company to such Special  Purpose Trust are  subordinated  to Senior
         Debt."

                  "Qualified Junior Subordinated Notes -- means any notes issued
         by the Company to a Special  Purpose Trust in a principal  amount equal
         to the  proceeds  received  by such  Special  Purpose  Trust  from  the
         issuance of Trust Preferred Securities and paid by such Special Purpose
         Trust to the Company in consideration for such notes, which notes shall
         (a)  not  mature,  or  otherwise  require  the  payment  of  any of the
         principal  thereof,  prior to June 1, 2029, (b) be subject to the right
         of the Company to defer the payment of interest  thereon at any time or
         from  time to time for a period  of at least  twenty  (20)  consecutive
         quarterly  periods,  during which deferral period the Company shall not
         pay any  dividends  with respect to any of its capital stock or pay any
         principal,  interest or other amounts owing in respect of any Qualified
         Capital  Obligations or other Subordinated Debt, (c) be unsecured,  (d)
         rank  subordinate  and junior in right of  payment  to all Senior  Debt
         (including,  without  limitation,  all Debt of the  Company  under this
         Agreement, the Other Agreements and the Notes) upon the terms set forth
         in Exhibit A to the First Amendment to Note Purchase  Agreement,  dated
         as of July 14, 1999, among the Company and certain holders of Notes and
         (e) when aggregated  with all other such notes,  not exceed One Hundred
         Twenty-Five  Million Dollars  ($125,000,000)  in aggregate  outstanding
         principal amount."

                  "Special  Purpose  Trust -- means a statutory  business  trust
         created under the laws of the State of Delaware  pursuant to the filing
         of a  certificate  of trust with the Secretary of State of the State of
         Delaware, (a) the existence of which shall be for the exclusive purpose
         of (i) issuing  Trust Common  Securities to the Company and issuing and
         selling  Trust  Preferred  Securities  to  investors,  (ii)  using  the
         proceeds  from such Trust  Preferred  Securities  to acquire  Qualified
         Junior  Subordinated  Notes  and (iii)  engaging  in only  those  other
         activities  necessary  or  incidental  to the  foregoing,  (b) the sole
         assets of which will be such Qualified  Junior  Subordinated  Notes and
         the  proceeds  thereof and (c) the sole source of revenue of which will
         be  payments   under  such   Qualified   Junior   Subordinated   Notes.
         Notwithstanding  anything else herein,  any Special Purpose Trust shall
         be deemed to be an Unrestricted Subsidiary."
<PAGE>

                  "Subordinated  Debt -- means any Debt or other  obligations of
         the  Company   (including,   without   limitation,   Qualified  Capital
         Obligations) other than Senior Debt."

                  "Trust  Common  Securities  -- means,  in respect of a Special
         Purpose  Trust,   securities  issued  by  such  Special  Purpose  Trust
         representing  common  undivided  beneficial  interests in the assets of
         such  Special  Purpose  Trust,  one  hundred  percent  (100%)  of which
         securities shall be legally and beneficially owned by the Company."

                  "Trust Preferred  Securities -- means, in respect of a Special
         Purpose Trust,  securities issued by such Special Purpose Trust, having
         a stated par value and  liquidation  value and  entitling  the  holders
         thereof to the payment (unless  deferred) of preferred  cumulative cash
         distributions at a fixed annual rate,  representing preferred undivided
         beneficial  interests  in the  assets of such  Special  Purpose  Trust,
         provided that at the time of the initial  issuance  thereof,  the Notes
         shall receive an investment  grade rating from, or an investment  grade
         rating of the Notes  shall be  confirmed  by, a  nationally  recognized
         rating agency."

SECTION 2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

         To induce the Noteholders to execute and deliver this Amendment  (which
representations  shall  survive  such  execution  and  delivery),   the  Company
represents and warrants to the Noteholders that:

               (a) the Company is a corporation duly organized, validly existing
          and in good standing under the laws of the state of Delaware;

               (b)  this  Amendment  has  been  duly  authorized,  executed  and
          delivered by the Company and this Amendment constitutes a legal, valid
          and  binding  obligation,   contract  and  agreement  of  the  Company
          enforceable  against  it in  accordance  with  its  terms,  except  as
          enforcement may be limited by bankruptcy, insolvency,  reorganization,
          moratorium  or similar  laws or  equitable  principles  relating to or
          limiting creditors' rights generally;

               (c) the  Existing  Note  Purchase  Agreement,  as amended by this
          Amendment,  constitutes  the  legal,  valid  and  binding  obligation,
          contract  and  agreement  of the  Company  enforceable  against  it in
          accordance  with its terms,  except as  enforcement  may be limited by
          bankruptcy, insolvency, reorganization,  moratorium or similar laws or
          equitable   principles  relating  to  or  limiting  creditors'  rights
          generally;

               (d) the  execution,  delivery and  performance  by the Company of
          this Amendment (i) has been duly authorized by all requisite corporate
          action and, if required, shareholder action, (ii) does not require the
          consent or approval of any  governmental or regulatory body or agency,
          and (iii) will not (A) violate (1) any provision of law, statute, rule
          or regulation or its certificate of incorporation  or bylaws,  (2) any
          order  of any  court or any  rule,  regulation  or order of any  other
          agency or  government  binding  upon it, or (3) any  provision  of any
          material  indenture,  agreement or other  instrument  to which it is a
          party or by which its properties or assets are or may be bound, or (B)
          result in a breach of or constitute (alone or with due notice or lapse
          of time or both) a default  under any  indenture,  agreement  or other
          instrument  referred to in clause  (iii)(A)(3)  of this paragraph (d);
          and

               (e) as of the  date  hereof  and  after  giving  effect  to  this
          Amendment,  no  Default  or Event of  Default  has  occurred  which is
          continuing.

SECTION 3. MISCELLANEOUS.

     3.1 This Amendment shall be construed in connection with and as part of the
Existing Note Purchase  Agreement,  and except as modified and expressly amended
by this Amendment, all terms, conditions and covenants contained in the Existing
Note  Purchase  Agreement  and the Notes are  hereby  ratified  and shall be and
remain in full force and effect.

     3.2 This  Amendment  constitutes  a contract  between  the  Company and the
Noteholders for the uses and purposes hereinabove set forth, and may be executed
in any  number  of  counterparts,  each  executed  counterpart  constituting  an
original, but all together only one agreement.

     3.3 Whenever any of the parties hereto is referred to, such reference shall
be deemed to include  the  successors  and  assigns of such  party,  and all the
promises  and  agreements  contained  in this  Amendment  by or on behalf of the
Company  and  the  Noteholders  shall  bind  and  inure  to the  benefit  of the
respective successors and assigns of such parties, whether so expressed or not.

     3.4 This Amendment  constitutes the final written  expression of all of the
terms hereof and is a complete and exclusive statement of those terms.

     3.5 This  Amendment  shall be governed by and construed in accordance  with
the internal laws of the State of New York.

     3.6 This  Amendment  shall  become  effective  at such  time as it has been
executed by the Company and the Required Holders.

            [The remainder of this page is intentionally left blank.
                         Next page is signature page.]

<PAGE>


         IN WITNESS  WHEREOF,  the parties  hereto have caused the  execution of
this Amendment by duly authorized officers of each as of the date hereof.

                                         SEITEL, INC.



                                         By__________________________________
                                           Debra D. Valice,
                                           Executive Vice President - Finance


Accepted and Agreed to:

[NOTEHOLDER]



By____________________________________
Name:
Title:


<PAGE>


                                    EXHIBIT A

                               Subordination Terms

     Note:The term  "Securities"  refers to the instruments  evidencing the debt
          subordinated by the following provisions;  the term "Holder" refers to
          a holder of Securities.

          SECTION [1.01]. Securities Subordinate to Senior Indebtedness

         The Securities  shall be  subordinated  to Senior  Indebtedness  as set
forth in this Article [One]. The Company  covenants and agrees,  and each Holder
of a  Security  of any  series  by such  Holder's  acceptance  thereof  likewise
covenants  and agrees,  that,  to the extent and in the manner  hereinafter  set
forth in this Article [One], the  indebtedness  represented by the Securities of
such series and the payment of the principal amount, interest, premium (if any),
and such  other  amounts,  if any,  payable  in  respect  of each and all of the
Securities of such series are hereby  expressly made  subordinate and subject in
right of  payment  to the  prior  payment  in full of all  Senior  Indebtedness;
provided,  however,  that no provision of this Article  [One] shall  prevent the
occurrence of any default or Event of Default hereunder.

         "Senior Notes" means, collectively,  (i) (a) the Company's 7.17% Series
A Senior Notes due December 30, 2001 in the original aggregate  principal amount
of  $25,000,000,  (b) the Company's 7.17% Series B Senior Notes due December 30,
2002 in the original  aggregate  principal  amount of  $27,500,000,  and (c) the
Company's Series C Senior Notes due December 30, 2002 in the original  aggregate
principal amount of $22,500,000,  in each case, issued pursuant to separate Note
Purchase Agreements, dated as of December 28, 1995, as such notes and agreements
may be amended  from time to time,  and (ii) (a) the  Company's  7.03%  Series D
Senior Notes due February 15, 2004 in the original aggregate principal amount of
$20,000,000, (b) the Company's 7.28% Series E Senior Notes due February 15, 2009
in the original aggregate principal amount of $75,000,000, and (c) the Company's
Series F Senior Notes due February 15, 2009 in the original aggregate  principal
amount of $43,000,000,  in each case,  issued pursuant to separate Note Purchase
Agreements,  dated as of February 12, 1999, as such notes and  agreements may be
amended from time to time.

         "Senior Indebtedness" means the principal of (and premium or make-whole
amount, if any) and interest on (including interest,  if any, accruing after the
filing  of  a  petition  initiating  any  proceeding  pursuant  to  any  Federal
bankruptcy law or any other  applicable  Federal or State law) and other amounts
due on or in  connection  with the  Senior  Notes  and any  Indebtedness  of the
Company incurred,  assumed or guaranteed by the Company,  whether outstanding on
the date of the Indenture or thereafter incurred,  assumed or guaranteed and all
renewals,  extensions  and refundings of any such  Indebtedness  of the Company;
provided, however, that the following will not constitute Senior Indebtedness:



<PAGE>


                  (a)  any  Indebtedness  of the  Company  as to  which,  in the
         instrument  creating  the same or  evidencing  the same or  pursuant to
         which  the same is  outstanding,  it is  expressly  provided  that such
         Indebtedness of the Company shall be subordinated to or pari passu with
         the Securities;

                  (b)  Indebtedness of the Company in respect of the Securities;

                  (c)  any  Indebtedness  of  the  Company   constituting  trade
         accounts payable arising in the ordinary course of business;
                  (d) any  Indebtedness of the Company  initially  issued to any
         other [trust  which issues  preferred  securities  or other  securities
         similar to preferred securities]; and

                  (e) any  Indebtedness  of the Company to any Subsidiary of the
         Company, other than a trust referred to in the preceding clause (d).

         SECTION [1.02].  Payment Over of Proceeds upon Dissolution, Etc.

         Upon any distribution of assets of the Company in the event of

                  (a) any insolvency or bankruptcy  case or  proceeding,  or any
         receivership,  liquidation,  reorganization  or other  similar  case or
         proceeding in connection  therewith,  relative to the Company or to its
         creditors, as such, or to its assets, or

                  (b) any  liquidation,  dissolution  or other winding up of the
         Company,  whether voluntary or involuntary and whether or not involving
         insolvency or bankruptcy, or

                  (c) any  assignment for the benefit of creditors  or any other
          marshalling of assets and liabilities of the Company,

then and in such event:

                  (1) the  holders of Senior  Indebtedness  shall be entitled to
         receive  payment in full of all  amounts  due or to become due on or in
         respect of all Senior Indebtedness, or provision shall be made for such
         payment in cash, before the Holders of the Securities of any series are
         entitled  to receive any  payment on account of the  principal  amount,
         interest,  premium (if any), or such other  amounts,  if any, as may be
         provided for in respect of the Securities of such series; and
<PAGE>

                  (2) any  payment or  distribution  of assets of the Company of
         any kind or  character,  whether in cash,  property or  securities,  by
         set-off or  otherwise,  to which the  Holders or the  Trustee  would be
         entitled but for the  provisions of this Article  [One],  including any
         such payment or  distribution  which may be payable or  deliverable  by
         reason of the payment of any other  Indebtedness  of the Company  being
         subordinated to the payment of the Securities of such series,  shall be
         paid by the  liquidating  trustee or agent or other person  making such
         payment or distribution, whether a trustee in bankruptcy, a receiver or
         liquidating  trustee or  otherwise,  directly  to the holders of Senior
         Indebtedness  or  their  representative  or  representatives  or to the
         trustee or trustees  under any  indenture  under which any  instruments
         evidencing  any of such  Senior  Indebtedness  may  have  been  issued,
         ratably  according to the aggregate amounts remaining unpaid on account
         of the  principal  of, and premium or  make-whole  amount,  if any, and
         interest on the Senior Indebtedness held or represented by each, to the
         extent  necessary  to make  payment in full of all Senior  Indebtedness
         remaining  unpaid,  after giving  affect to any  concurrent  payment or
         distribution to the holders of such Senior Indebtedness.

         In the event that,  notwithstanding  the  foregoing  provisions of this
Section  [1.02],  the Trustee or the Holder of any  Security of any series shall
receive  any  payment or  distribution  of assets of the  Company of any kind or
character,  whether in cash, property or securities,  including any such payment
or distribution  which may be payable or deliverable by reason of the payment of
any other  Indebtedness of the Company being  subordinated to the payment of the
Securities  of such series,  before all Senior  Indebtedness  is paid in full or
payment  thereof  provided for, and if such fact shall then have been made known
to the  Trustee as  provided  in Section  [1.11],  or, as the case may be,  such
Holder,  then and in such event such payment or distribution  shall be paid over
or  delivered  forthwith  to the trustee in  bankruptcy,  receiver,  liquidating
trustee,   custodian,   assignee,  agent  or  other  person  making  payment  or
distribution  of assets of the  Company  for  application  to the payment of all
Senior Indebtedness  remaining unpaid, to the extent necessary to pay all Senior
Indebtedness  in  full,  after  giving  effect  to  any  concurrent  payment  or
distribution to or for the holders of Senior Indebtedness.

         For purposes of this Article [One] only,  the words "cash,  property or
securities," or any combination  thereof,  shall be deemed not to include shares
of capital stock of the Company as reorganized  or readjusted,  or securities of
the Company or any other corporation provided for by a plan of reorganization or
readjustment  the  payment  of which  is  subordinated,  at least to the  extent
provided in this Article [One] with respect to the Securities, to the payment of
all  Senior  Indebtedness  which  may  at the  time  be  outstanding  and to any
securities issued to the holders of Senior Indebtedness in respect of the Senior
Indebtedness under any such plan of reorganization or readjustment.

        SECTION [1.03].Prior Payment to Senior Indebtedness upon Acceleration of
Securities.

         In the event that any  Securities  of any series are  declared  due and
payable  before their [Stated  Maturity],  then and in such event the holders of
Senior  Indebtedness shall be entitled to receive payment in full of all amounts
due or to become due on or in respect of all Senior  Indebtedness  or  provision
shall be made for such payment in cash,  before the Holders of the Securities of
such series are entitled to receive any payment (including any payment which may
be payable by reason of the  payment of any other  indebtedness  of the  Company
being  subordinated  to the  payment of the  Securities  of such  series) by the
Company on account of the principal of (or premium or make-whole amount, if any)
or interest or other  amounts on  Securities of such series or on account of the
purchase or other acquisition of Securities of such series.

         In the event that,  notwithstanding  the  foregoing,  the Company shall
make any  payment to the Trustee or the Holder of any  Securities  of any series
prohibited by the foregoing provisions of this Section [1.03], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

         The  provisions  of this Section  [1.03] shall not apply to any payment
with respect to which Section [1.02] would be applicable.

         SECTION [1.04].  Default in Senior Indebtedness.

         In the event and during the  continuation of any default by the Company
in the payment of principal,  premium, if any, interest or any other payment due
on any  Senior  Indebtedness  of the  Company,  as the case may be,  beyond  any
applicable grace period with respect thereto,  or in the event that the maturity
of any Senior  Indebtedness of the Company has been  accelerated  because of any
default,  then,  in any such case,  no payment shall be made by the Company with
respect to the principal (including  redemption payments, if any) of, premium or
make-whole  amount, if any, or interest or other amounts on the Securities until
such default is cured or waived or ceases to exist or any such  acceleration  or
demand for payment has been rescinded.

         In the event that,  notwithstanding  the  foregoing,  the Company shall
make any  payment to the Trustee or the Holder of any  Securities  of any series
prohibited by the foregoing provisions of this Section [1.04], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

         The  provisions  of this Section  [1.04] shall not apply to any payment
with respect to which Section [1.02] would be applicable.

         SECTION [1.05].  Limitations on Acceleration and Enforcement.

         At any time when the  Company  may not make  payments in respect of the
Securities  as a result  of the  application  of  Section  [1.04],  no Holder of
Securities will:

                  (a) accelerate  or  cause  or  permit  the acceleration of the
         maturity of any of the Securities; or

                  (b) commence,  cause the  commencement  of,  participate in or
         support any action or proceeding  (whether at law or in equity) against
         the Company to recover all or any part of the indebtedness  represented
         by the Securities or any action to commence or prosecute any bankruptcy
         or similar  proceeding in respect of the Company  unless the holders of
         at least a majority in principal amount of the Senior Notes at the time
         outstanding (exclusive of Senior Notes then owned by the Company or any
         of its  subsidiaries  or  affiliates)  shall have  agreed in writing in
         advance to, and shall have joined in, such proceedings.

         SECTION [1.06].  Payment Permitted if No Default.

         Nothing  contained in this Article [One] or elsewhere in this Indenture
or in any of the  Securities  shall prevent (a) the Company,  at any time except
during the pendency of any case, proceeding,  dissolution,  liquidation or other
winding up,  assignment  for the benefit of  creditors or other  marshalling  of
assets and liabilities of the Company referred to in Section [1.02] or under the
conditions  described in Sections [1.03] or [1.04],  from making payments at any
time of the principal amount,  interest or such other amounts, if any, as may be
provided  for  in  this  Indenture,  as the  case  may  be,  in  respect  of the
Securities, or (b) the application by the Trustee or the retention by any Holder
of any money  deposited with it hereunder to the payment of or on account of the
principal amount, interest or such other amounts, if any, as may be provided for
in this  Indenture,  as the case may be, in  respect  of the  Securities  if the
Trustee did not have, at the time provided in the proviso to the first paragraph
of Section  [1.11],  notice that such payment would have been  prohibited by the
provisions of this Article [One].

         SECTION [1.07].  Subrogation Rights of Holders of Senior Indebtedness.

         Subject to the payment in full of all Senior Indebtedness,  the Holders
of the  Securities  of any  series  shall be  subrogated  to the  extent  of the
payments  or  distributions  made to the  holders  of such  Senior  Indebtedness
pursuant to the provisions of this Article [One] to the rights of the holders of
such Senior  Indebtedness to receive payments or distributions of cash, property
or securities  applicable to the Senior Indebtedness until the principal amount,
interest or such other amounts,  if any, as provided for in this  Indenture,  as
the case may be, in respect of the  Securities  of such series  shall be paid in
full.  For purposes of such  subrogation,  no payments or  distributions  to the
holders of the Senior  Indebtedness of any cash, property or securities to which
the Holders of the  Securities  of such series or the Trustee  would be entitled
except for the provisions of this Article [One], and no payments pursuant to the
provisions  of this  Article  [One] to the  Company or to the  holders of Senior
Indebtedness by Holders of the Securities of such series or the Trustee,  shall,
as between the Company,  its creditors other than holders of Senior Indebtedness
and the Holders of the  Securities of such series,  be deemed to be a payment or
distribution by the Company to or on account of the Senior Indebtedness.

         SECTION [1.08].  Provision Solely to Define Relative Rights.

         The  provisions of this Article  [One] are and are intended  solely for
the purpose of defining the relative  rights of the Holders of the Securities of
any series,  on one hand, and the holders of Senior  Indebtedness,  on the other
hand.  Nothing contained in this Article [One] or elsewhere in this Indenture or
in the Securities of any series is intended to or shall:

                  (a)  impair,  as between  the  Company  and the Holders of the
         Securities  of such series,  the  obligation  of the Company,  which is
         absolute and unconditional,  to pay to the Holders of the Securities of
         such series the principal  amount,  interest or such other amounts,  if
         any, as may be provided for in this  Indenture,  as the case may be, in
         respect  of the  Securities  of such  series as and when the same shall
         become due and payable in accordance  with the terms of the  Securities
         of such  series and this  Indenture  and  which,  subject to the rights
         under this  Article  [One] of the  holders of Senior  Indebtedness,  is
         intended to rank  equally  with all other  general  obligations  of the
         Company; or

                  (b) affect the  relative  rights  against  the  Company of the
         Holders of the  Securities  of such series and creditors of the Company
         other than holders of Senior Indebtedness; or

                  (c) prevent the Trustee or the Holder of any  Security of such
         series from exercising all remedies  otherwise  permitted by applicable
         law upon default under this Indenture,  subject to the rights,  if any,
         under  this  Article  [One] of the  holders of Senior  Indebtedness  to
         receive cash,  property or securities  otherwise payable or deliverable
         to the Trustee or such Holder.

         SECTION [1.09].  Trustee to Effectuate Subordination.

         Each  Holder  of  a  Security  by  such  Holder's   acceptance  thereof
authorizes  and directs the Trustee on such Holder's  behalf to take such action
as may be necessary or appropriate to effectuate the  subordination  provided in
this Article [One] and appoints the Trustee such Holder's  attorney-in-fact  for
any and all such purposes.

         SECTION [1.10].  No Waiver of Subordination Provision.

         No right of any present or future holder of any Senior  Indebtedness to
enforce  subordination  as  herein  provided  shall  at any  time  in any way be
prejudiced  or  impaired by any act or failure to act on the part of the Company
or by any act or failure to act, by any such holder,  or by any noncompliance by
the  Company  with  the  terms,  provisions  and  covenants  of this  Indenture,
regardless  of any  knowledge  thereof any such holder may have or be  otherwise
charged with.

         Without in any way limiting the generality of the foregoing  paragraph,
the  holders  of  Senior  Indebtedness  may,  at any time and from time to time,
without  the  consent  of, or notice  to,  the  Trustee  or the  Holders  of the
Securities of any series, without incurring responsibility to the Holders of the
Securities of such series and without  impairing or releasing the  subordination
provided in this Article  [One] or the  obligations  hereunder of the Holders of
the Securities of such series to the holders of Senior Indebtedness,  do any one
or more of the  following:  (i) change the manner,  place or terms of payment or
extend the time of payment  of, or renew or alter,  or  increase  the amount of,
Senior  Indebtedness,  or otherwise  amend or  supplement  in any manner  Senior
Indebtedness or any instrument  evidencing the same or any agreement under which
Senior Indebtedness is outstanding;  (ii) sell,  exchange,  release or otherwise
dispose of or deal with any property  pledged,  mortgaged or otherwise  securing
Senior  Indebtedness;  (iii)  release  any  person  liable in any manner for the
payment or  collection  of Senior  Indebtedness;  (iv)  exercise or refrain from
exercising any rights against the Company or any other person; and (v) apply any
sums paid in respect of Senior Indebtedness to Senior  Indebtedness,  regardless
of who made such payment or how such payment was realized.

         SECTION [1.11].  Notice to Trustee.

         The Company shall give prompt written notice to the Trustee of any fact
known to the Company which would prohibit the making of any payment to or by the
Trustee in respect of the Securities of any series.  Failure to give such notice
shall not affect the  subordination  of the  Securities of such series to Senior
Indebtedness.  Notwithstanding the provisions of this Article [One] or any other
provision of this Indenture,  the Trustee shall not be charged with knowledge of
the existence of any facts which would  prohibit the making of any payment to or
by the Trustee in respect of the Securities of such series, unless and until the
Trustee shall have received  written notice thereof in the manner  prescribed by
this Indenture from the Company or a holder of Senior  Indebtedness  or from any
trustee or agent therefor; and, prior to the receipt of any such written notice,
the Trustee,  subject to the  provisions  of Section  [regarding  the duties and
responsibilities  of the  Trustee],  shall be entitled in all respects to assume
that no such facts exist; provided,  however, that if the Trustee shall not have
received, at least three Business Days prior to the date upon which by the terms
hereof  any  money  may  become  payable  for any  purpose  (including,  without
limitation, the payment of the principal amount, interest, or such other amounts
as may be provided for in this Indenture in respect of any Security), the notice
with respect to such money provided for in this Section [1.11],  then,  anything
herein  contained to the contrary  notwithstanding,  the Trustee  shall have the
full  power and  authority  to  receive  such money and to apply the same to the
purpose  for which  such money was  received  and shall not be  affected  by any
notice to the contrary  which may be received by it within three  Business  Days
prior to such date.

         Subject  to  the  provisions  of  Section  [regarding  the  duties  and
responsibilities  of the Trustee],  the Trustee shall be entitled to rely on the
delivery  to it of a written  notice by a person  representing  himself  to be a
holder of Senior  Indebtedness  (or a trustee or agent on behalf of such holder)
to establish that such notice has been given by a holder of Senior  Indebtedness
(or a  trustee  or agent on behalf of any such  holder).  In the event  that the
Trustee  determines in good faith that further evidence is required with respect
to the right of any person as a holder of Senior  Indebtedness to participate in
any payment or  distribution  pursuant to this  Article  [One],  the Trustee may
request such person to furnish  evidence to the reasonable  satisfaction  of the
Trustee as to the amount of Senior  Indebtedness held by such person, the extent
to which such person is entitled to participate in such payment or  distribution
and any other facts  pertinent  to the rights of such person  under this Article
[One], and if such evidence is not furnished,  the Trustee may defer any payment
which it may be required to make for the benefit of such person  pursuant to the
terms of this Indenture  pending judicial  determination as to the right of such
person to receive such payment.

         SECTION [1.12].    Reliance    on  Judicial  Order  or  Certificate  of
Liquidating Agent.

         Upon any payment or distribution  of assets of the Company  referred to
in this  Article  [One],  the  Trustee,  subject  to the  provisions  of Section
[regarding the duties and  responsibilities of the Trustee],  and the Holders of
the  Securities of any series shall be entitled to rely upon any order or decree
entered  by any  court  of  competent  jurisdiction  in which  such  insolvency,
bankruptcy, receivership, liquidation,  reorganization,  dissolution, winding up
or similar case or  proceeding is pending,  or a  certificate  of the trustee in
bankruptcy,  liquidating trustee, custodian,  receiver, assignee for the benefit
of  creditors,  agent or other  person  making  such  payment  or  distribution,
delivered to the Trustee or to the Holders of Securities of such series, for the
purpose of ascertaining  the persons  entitled to participate in such payment or
distribution,  the holders of Senior  Indebtedness and other indebtedness of the
Company,  the amount thereof or payable  thereon,  the amount or amounts paid or
distributed  thereon and all other facts  pertinent  thereto or to this  Article
[One].

         SECTION [1.13].   Trustee   Not   Fiduciary   for   Holders  of  Senior
Indebtedness.

         The  Trustee  shall  be  deemed  not to owe any  fiduciary  duty to the
holders of Senior Indebtedness.  The Trustee shall not be charged with knowledge
of the existence of Senior  Indebtedness (other than the Senior Notes) or of any
facts that would  prohibit any payment  hereunder  unless the Trustee shall have
received notice thereof in the manner prescribed by this Indenture. With respect
to the holders of Senior  Indebtedness,  the Trustee undertakes to perform or to
observe only such of its covenants or obligation as are  specifically  set forth
in this Article [One] and no implied  covenants or  obligations  with respect to
holders of Senior  Indebtedness  shall be read into this  Indenture  against the
Trustee.

         SECTION [1.14].   Rights  of  Trustee as Holder of Senior Indebtedness;
Preservation of Trustee's Rights.

         The  Trustee in its  individual  capacity  shall be entitled to all the
rights set forth in this Article  [One] with respect to any Senior  Indebtedness
which may at any time be held by it, to the same  extent as any other  holder of
Senior Indebtedness,  and nothing in this Indenture shall deprive the Trustee of
any of its rights as such holder.

         Nothing in this Article [One] shall apply to claims of, or payments to,
the Trustee  under or pursuant to Section  [concerning  fees and expenses of the
Trustee].

         SECTION [1.15].  Article [One] Applicable to Paying Agents.

         The term  "Trustee"  as used in this  Article  [One] shall  (unless the
context  otherwise  requires) be construed  as  extending to and  including  the
Paying  Agent within its meaning as fully for all intents and purposes as if the
Paying Agent were named in this Article  [One] in addition to or in place of the
Trustee;  provided,  however, that Sections [1.11] and [1.13] shall not apply to
the  Company or any  Affiliate  of the Company if it or such  Affiliate  acts as
Paying Agent.




                   SECOND AMENDMENT TO NOTE PURCHASE AGREEMENT

          THIS SECOND AMENDMENT, dated as of July 14, 1999 (the "Amendment"), to
the separate Note Purchase  Agreements,  dated as of December 28, 1995, is among
Seitel,  Inc. (the "Company") and each of the institutions  which is a signatory
to this Amendment (collectively, the "Noteholders").

                                    RECITALS:

          A. The Company and each of the  Noteholders  have  heretofore  entered
into  separate  Note  Purchase   Agreements   dated  as  of  December  28,  1995
(collectively,  as amended and in effect  immediately prior to the effectiveness
of this Amendment,  the "Existing Note Purchase  Agreement"),  pursuant to which
the Company issued:  (a)  $25,000,000  aggregate  principal  amount of its 7.17%
Series A Senior  Notes due  December  30,  2001  (the  "Series  A  Notes"),  (b)
$27,500,000  aggregate  principal  amount of its 7.17% Series B Senior Notes due
December 30, 2002 (the "Series B Notes"),  and (c)  $22,500,000  of its Series C
Senior Notes due December 30, 2002 (the "Series C Notes",  and together with the
Series A Notes and the Series B Notes, the "Notes").

          B.  Capitalized  terms used herein shall have the respective  meanings
ascribed  thereto in the Existing Note Purchase  Agreement unless herein defined
or the context shall otherwise require.

          C. The Company and the  Noteholders  now desire to amend the  Existing
Note Purchase Agreement in the respects,  but only in the respects,  hereinafter
set forth.

          D. All requirements of law have been fully complied with and all other
acts and things  necessary  to make this  Amendment  a legal,  valid and binding
instrument  according to its terms for the purposes  herein  expressed have been
done or performed.

          NOW,  THEREFORE,  for good and valuable  consideration the receipt and
sufficiency of which are hereby acknowledged, the Company and the Noteholders do
hereby agree as follows:

SECTION 1. AMENDMENTS.

          1.1 Amendment to Section 10.7(a). Section 10.7(a) of the Existing Note
Purchase Agreement is hereby amended and restated in its entirety as follows:

         "10.7  Restricted Payments and Restricted Investments.

                            (a)  Limitation.  The Company will not, and will not
                  permit any of the  Restricted  Subsidiaries  to,  directly  or
                  indirectly,  declare,  make or incur any liability to make any
                  Restricted   Payment  or  make  or  authorize  any  Restricted
                  Investment  unless  immediately  after  giving  effect to such
                  action:

                                     (i) the sum of (x) the aggregate  amount of
                           outstanding     Restricted     Investments    (valued
                           immediately   after  such   action),   plus  (y)  the
                           aggregate  amount  of  Restricted   Payments  of  the
                           Company and the Restricted  Subsidiaries  declared or
                           made during the period commencing on the Series A and
                           B  Closing   Date,   and  ending  on  the  date  such
                           Restricted   Payment  or  Restricted   Investment  is
                           declared or made, inclusive, would not exceed the sum
                           of

                                              (A)     Ten    Million     Dollars
                                    ($10,000,000), plus

                                              (B)   fifty   percent   (50%)   of
                                    Consolidated   Net  Income  for  the  period
                                    commencing  July 1,  1995 and  ending on the
                                    date  such   Restricted   Payment   or  such
                                    Restricted  Investment  is  declared or made
                                    (or minus  100% of  Consolidated  Net Income
                                    for such period if  Consolidated  Net Income
                                    for such period is a loss), plus

                                              (C)   the  aggregate amount of Net
                                    Proceeds of Common  Stock of the Company for
                                    such period, plus

                                              (D)   the   aggregate   amount  of
                                    Net  Proceeds  of Qualified Capital for such
                                    period; and

                            (ii) the Company  could  incur,  pursuant to Section
                  10.3, at least One Dollar ($1) of  additional  Debt owing to a
                  Person other than a Restricted Subsidiary; and

                            (iii)   no Default or Event of Default would exist."

          1.2  Amendment to Schedule B. Schedule B to the Existing Note Purchase
Agreement is hereby  amended to modify in their  entirety or add,  each in their
proper alphabetical order, the following defined terms:

                   "Consolidated Debt -- means, as of any date of determination,
         the total of all Debt of the  Company and the  Restricted  Subsidiaries
         outstanding on such date, after  eliminating all offsetting  debits and
         credits  between the Company and the  Restricted  Subsidiaries  and all
         other items required to be eliminated in the course of the  preparation
         of consolidated  financial statements of the Company and the Restricted
         Subsidiaries in accordance with GAAP,  provided that  Consolidated Debt
         shall not include Qualified Capital Obligations."

                   "Consolidated  Net  Worth --  means,  at any  time,  the sum,
         without duplication,  of (a) the total stockholders' equity which would
         be shown in  consolidated  financial  statements of the Company and the
         Restricted  Subsidiaries  prepared at such time in accordance with GAAP
         plus (b) Qualified Capital."

                   "Net Proceeds of Qualified  Capital -- means, with respect to
         any period, cash proceeds (net of all costs and out-of-pocket  expenses
         incurred in connection  therewith  and in connection  with the issuance
         and sale of any related Trust Preferred Securities,  including, without
         limitation,  placement,  underwriting  and brokerage fees and expenses)
         received  by the  Company  during  such  period  from  the  sale of all
         Qualified Junior Subordinated Notes."
                   "Qualified  Capital  -- means the total  amount of capital in
         respect of Qualified Junior  Subordinated Notes and the Trust Preferred
         Securities  related  thereto which would,  on a consolidated  basis, be
         shown in  consolidated  financial  statements  of the  Company  and the
         Subsidiaries  prepared at such time in accordance  with GAAP,  provided
         that in no event shall the aggregate amount of Qualified Capital at any
         time exceed One Hundred Twenty-Five Million Dollars ($125,000,000)."

                   "Qualified  Capital  Obligations -- means  obligations of the
         Company in  respect  of any  Qualified  Junior  Subordinated  Notes and
         Qualified Junior Subordinated Guaranties."

                   "Qualified Junior Subordinated  Guaranty -- means, in respect
         of any issue of Trust Preferred  Securities,  a Guaranty by the Company
         to the holders of such Trust Preferred Securities of (a) the payment of
         all preferred  cumulative cash dividends  accumulating  thereon and (b)
         the payments due on liquidation  or redemption of such Trust  Preferred
         Securities,  but only in each case to the  extent of funds  held by the
         Special  Purpose  Trust which  shall have  issued such Trust  Preferred
         Securities, and the obligations under which Guaranty shall be unsecured
         and rank  subordinate and junior in right of payment to all Senior Debt
         (including,  without  limitation,  all Debt of the  Company  under this
         Agreement,  the Other  Agreements and the Notes) to the same extent and
         on the same terms as the Qualified Junior  Subordinated Notes issued by
         the Company to such Special  Purpose Trust are  subordinated  to Senior
         Debt."

                   "Qualified  Junior  Subordinated  Notes  -- means  any  notes
         issued by the Company to a Special Purpose Trust in a principal  amount
         equal to the proceeds  received by such Special  Purpose Trust from the
         issuance of Trust Preferred Securities and paid by such Special Purpose
         Trust to the Company in consideration for such notes, which notes shall
         (a)  not  mature,  or  otherwise  require  the  payment  of  any of the
         principal  thereof,  prior to June 1, 2029, (b) be subject to the right
         of the Company to defer the payment of interest  thereon at any time or
         from  time to time for a period  of at least  twenty  (20)  consecutive
         quarterly  periods,  during which deferral period the Company shall not
         pay any  dividends  with respect to any of its capital stock or pay any
         principal,  interest or other amounts owing in respect of any Qualified
         Capital  Obligations or other Subordinated Debt, (c) be unsecured,  (d)
         rank  subordinate  and junior in right of  payment  to all Senior  Debt
         (including,  without  limitation,  all Debt of the  Company  under this
         Agreement, the Other Agreements and the Notes) upon the terms set forth
         in Exhibit A to the Second Amendment to Note Purchase Agreement,  dated
         as of July 14, 1999, among the Company and certain holders of Notes and
         (e) when aggregated  with all other such notes,  not exceed One Hundred
         Twenty-Five  Million Dollars  ($125,000,000)  in aggregate  outstanding
         principal amount."

                   "Special  Purpose Trust -- means a statutory  business  trust
         created under the laws of the State of Delaware  pursuant to the filing
         of a  certificate  of trust with the Secretary of State of the State of
         Delaware, (a) the existence of which shall be for the exclusive purpose
         of (i) issuing  Trust Common  Securities to the Company and issuing and
         selling  Trust  Preferred  Securities  to  investors,  (ii)  using  the
         proceeds  from such Trust  Preferred  Securities  to acquire  Qualified
         Junior  Subordinated  Notes  and (iii)  engaging  in only  those  other
         activities  necessary  or  incidental  to the  foregoing,  (b) the sole
         assets of which will be such Qualified  Junior  Subordinated  Notes and
         the  proceeds  thereof and (c) the sole source of revenue of which will
         be  payments   under  such   Qualified   Junior   Subordinated   Notes.
         Notwithstanding  anything else herein,  any Special Purpose Trust shall
         be deemed to be an Unrestricted Subsidiary."

                   "Subordinated  Debt -- means any Debt or other obligations of
         the  Company   (including,   without   limitation,   Qualified  Capital
         Obligations) other than Senior Debt."

                   "Trust Common  Securities  -- means,  in respect of a Special
         Purpose  Trust,   securities  issued  by  such  Special  Purpose  Trust
         representing  common  undivided  beneficial  interests in the assets of
         such  Special  Purpose  Trust,  one  hundred  percent  (100%)  of which
         securities shall be legally and beneficially owned by the Company."

                   "Trust Preferred Securities -- means, in respect of a Special
         Purpose Trust,  securities issued by such Special Purpose Trust, having
         a stated par value and  liquidation  value and  entitling  the  holders
         thereof to the payment (unless  deferred) of preferred  cumulative cash
         distributions at a fixed annual rate,  representing preferred undivided
         beneficial  interests  in the  assets of such  Special  Purpose  Trust,
         provided that at the time of the initial  issuance  thereof,  the Notes
         shall receive an investment  grade rating from, or an investment  grade
         rating of the Notes  shall be  confirmed  by, a  nationally  recognized
         rating agency."

SECTION 2.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.

          To induce the Noteholders to execute and deliver this Amendment (which
representations  shall  survive  such  execution  and  delivery),   the  Company
represents and warrants to the Noteholders that:

                    (a)  the   Company   is  a   corporation   duly   organized,
         validly  existing  and in  good standing under the laws of the state of
         Delaware;

                   (b) this  Amendment  has been duly  authorized,  executed and
         delivered by the Company and this Amendment  constitutes a legal, valid
         and  binding   obligation,   contract  and  agreement  of  the  Company
         enforceable  against  it  in  accordance  with  its  terms,  except  as
         enforcement may be limited by bankruptcy,  insolvency,  reorganization,
         moratorium  or similar  laws or  equitable  principles  relating  to or
         limiting creditors' rights generally;

                   (c) the Existing Note Purchase Agreement,  as amended by this
         Amendment,   constitutes  the  legal,  valid  and  binding  obligation,
         contract  and  agreement  of  the  Company  enforceable  against  it in
         accordance  with its  terms,  except as  enforcement  may be limited by
         bankruptcy, insolvency,  reorganization,  moratorium or similar laws or
         equitable   principles   relating  to  or  limiting  creditors'  rights
         generally;

                   (d) the execution, delivery and performance by the Company of
         this Amendment (i) has been duly authorized by all requisite  corporate
         action and, if required,  shareholder action, (ii) does not require the
         consent or approval of any  governmental  or regulatory body or agency,
         and (iii) will not (A) violate (1) any provision of law, statute,  rule
         or regulation or its certificate of  incorporation  or bylaws,  (2) any
         order of any court or any rule, regulation or order of any other agency
         or  government  binding  upon it, or (3) any  provision of any material
         indenture,  agreement or other  instrument to which it is a party or by
         which its properties or assets are or may be bound,  or (B) result in a
         breach of or  constitute  (alone or with due notice or lapse of time or
         both) a default  under any  indenture,  agreement  or other  instrument
         referred to in clause (iii)(A)(3) of this paragraph (d); and

                   (e) as of the date  hereof  and after  giving  effect to this
         Amendment,  no  Default  or  Event of  Default  has  occurred  which is
         continuing.

SECTION 3. MISCELLANEOUS.

          3.1 This Amendment  shall be construed in connection  with and as part
of the Existing  Note Purchase  Agreement,  and except as modified and expressly
amended by this Amendment,  all terms, conditions and covenants contained in the
Existing Note Purchase  Agreement and the Notes are hereby ratified and shall be
and remain in full force and effect.

          3.2 This Amendment  constitutes a contract between the Company and the
Noteholders for the uses and purposes hereinabove set forth, and may be executed
in any  number  of  counterparts,  each  executed  counterpart  constituting  an
original, but all together only one agreement.

          3.3 Whenever any of the parties  hereto is referred to, such reference
shall be deemed to include the successors and assigns of such party, and all the
promises  and  agreements  contained  in this  Amendment  by or on behalf of the
Company  and  the  Noteholders  shall  bind  and  inure  to the  benefit  of the
respective successors and assigns of such parties, whether so expressed or not.

          3.4 This  Amendment  constitutes  the final written  expression of all
of the terms hereof and is a complete and exclusive statement of those terms.

          3.5 This  Amendment  shall be governed by and  construed in accordance
with the internal laws of the State of New York.

          3.6 This Amendment shall become  effective at such time as it has been
executed by the Company and the Required Holders.

            [The remainder of this page is intentionally left blank.
                         Next page is signature page.]

<PAGE>


          IN WITNESS  WHEREOF,  the parties  hereto have caused the execution of
this Amendment by duly authorized officers of each as of the date hereof.

                                    SEITEL, INC.



                                    By__________________________________
                                      Debra D. Valice,
                                      Executive Vice President - Finance


Accepted and Agreed to:

[NOTEHOLDER]



By____________________________________
Name:
Title:


<PAGE>


                                    EXHIBIT A

                               Subordination Terms

     Note:The term  "Securities"  refers to the instruments  evidencing the debt
          subordinated by the following provisions;  the term "Holder" refers to
          a holder of Securities.

          SECTION [1.01]. Securities Subordinate to Senior Indebtedness

          The Securities  shall be  subordinated  to Senior  Indebtedness as set
forth in this Article [One]. The Company  covenants and agrees,  and each Holder
of a  Security  of any  series  by such  Holder's  acceptance  thereof  likewise
covenants  and agrees,  that,  to the extent and in the manner  hereinafter  set
forth in this Article [One], the  indebtedness  represented by the Securities of
such series and the payment of the principal amount, interest, premium (if any),
and such  other  amounts,  if any,  payable  in  respect  of each and all of the
Securities of such series are hereby  expressly made  subordinate and subject in
right of  payment  to the  prior  payment  in full of all  Senior  Indebtedness;
provided,  however,  that no provision of this Article  [One] shall  prevent the
occurrence of any default or Event of Default hereunder.

          "Senior Notes" means, collectively, (i) (a) the Company's 7.17% Series
A Senior Notes due December 30, 2001 in the original aggregate  principal amount
of  $25,000,000,  (b) the Company's 7.17% Series B Senior Notes due December 30,
2002 in the original  aggregate  principal  amount of  $27,500,000,  and (c) the
Company's Series C Senior Notes due December 30, 2002 in the original  aggregate
principal amount of $22,500,000,  in each case, issued pursuant to separate Note
Purchase Agreements, dated as of December 28, 1995, as such notes and agreements
may be amended  from time to time,  and (ii) (a) the  Company's  7.03%  Series D
Senior Notes due February 15, 2004 in the original aggregate principal amount of
$20,000,000, (b) the Company's 7.28% Series E Senior Notes due February 15, 2009
in the original aggregate principal amount of $75,000,000, and (c) the Company's
Series F Senior Notes due February 15, 2009 in the original aggregate  principal
amount of $43,000,000,  in each case,  issued pursuant to separate Note Purchase
Agreements,  dated as of February 12, 1999, as such notes and  agreements may be
amended from time to time.

          "Senior   Indebtedness"   means  the  principal  of  (and  premium  or
make-whole amount, if any) and interest on (including interest, if any, accruing
after the filing of a petition initiating any proceeding pursuant to any Federal
bankruptcy law or any other  applicable  Federal or State law) and other amounts
due on or in  connection  with the  Senior  Notes  and any  Indebtedness  of the
Company incurred,  assumed or guaranteed by the Company,  whether outstanding on
the date of the Indenture or thereafter incurred,  assumed or guaranteed and all
renewals,  extensions  and refundings of any such  Indebtedness  of the Company;
provided, however, that the following will not constitute Senior Indebtedness:

                   (a) any  Indebtedness  of the  Company  as to  which,  in the
         instrument  creating  the same or  evidencing  the same or  pursuant to
         which  the same is  outstanding,  it is  expressly  provided  that such
         Indebtedness of the Company shall be subordinated to or pari passu with
         the Securities;

                   (b) Indebtedness of the Company in respect of the Securities;

                   (c) any  Indebtedness  of  the  Company   constituting  trade
         accounts  payable arising in the ordinary course of business;

                   (d) any  Indebtedness of the Company  initially issued to any
         other [trust  which issues  preferred  securities  or other  securities
         similar to preferred securities]; and

                   (e) any  Indebtedness of the Company to any Subsidiary of the
         Company, other than a trust referred to in the preceding clause (d).

         SECTION [1.02].  Payment Over of Proceeds upon Dissolution, Etc.

         Upon any distribution of assets of the Company in the event of

                   (a) any insolvency or bankruptcy  case or proceeding,  or any
         receivership,  liquidation,  reorganization  or other  similar  case or
         proceeding in connection  therewith,  relative to the Company or to its
         creditors, as such, or to its assets, or

                   (b)   any   liquidation,  dissolution  or  other  winding  up
         of  the  Company,  whether voluntary or involuntary and whether  or not
         involving insolvency or bankruptcy, or

                   (c) any  assignment for the benefit of creditors or any other
         marshalling  of assets and liabilities of the Company,

then and in such event:

                   (1) the holders of Senior  Indebtedness  shall be entitled to
         receive  payment in full of all  amounts  due or to become due on or in
         respect of all Senior Indebtedness, or provision shall be made for such
         payment in cash, before the Holders of the Securities of any series are
         entitled  to receive any  payment on account of the  principal  amount,
         interest,  premium (if any), or such other  amounts,  if any, as may be
         provided for in respect of the Securities of such series; and

                   (2) any payment or  distribution  of assets of the Company of
         any kind or  character,  whether in cash,  property or  securities,  by
         set-off or  otherwise,  to which the  Holders or the  Trustee  would be
         entitled but for the  provisions of this Article  [One],  including any
         such payment or  distribution  which may be payable or  deliverable  by
         reason of the payment of any other  Indebtedness  of the Company  being
         subordinated to the payment of the Securities of such series,  shall be
         paid by the  liquidating  trustee or agent or other person  making such
         payment or distribution, whether a trustee in bankruptcy, a receiver or
         liquidating  trustee or  otherwise,  directly  to the holders of Senior
         Indebtedness  or  their  representative  or  representatives  or to the
         trustee or trustees  under any  indenture  under which any  instruments
         evidencing  any of such  Senior  Indebtedness  may  have  been  issued,
         ratably  according to the aggregate amounts remaining unpaid on account
         of the  principal  of, and premium or  make-whole  amount,  if any, and
         interest on the Senior Indebtedness held or represented by each, to the
         extent  necessary  to make  payment in full of all Senior  Indebtedness
         remaining  unpaid,  after giving  affect to any  concurrent  payment or
         distribution to the holders of such Senior Indebtedness.

          In the event that,  notwithstanding  the foregoing  provisions of this
Section  [1.02],  the Trustee or the Holder of any  Security of any series shall
receive  any  payment or  distribution  of assets of the  Company of any kind or
character,  whether in cash, property or securities,  including any such payment
or distribution  which may be payable or deliverable by reason of the payment of
any other  Indebtedness of the Company being  subordinated to the payment of the
Securities  of such series,  before all Senior  Indebtedness  is paid in full or
payment  thereof  provided for, and if such fact shall then have been made known
to the  Trustee as  provided  in Section  [1.11],  or, as the case may be,  such
Holder,  then and in such event such payment or distribution  shall be paid over
or  delivered  forthwith  to the trustee in  bankruptcy,  receiver,  liquidating
trustee,   custodian,   assignee,  agent  or  other  person  making  payment  or
distribution  of assets of the  Company  for  application  to the payment of all
Senior Indebtedness  remaining unpaid, to the extent necessary to pay all Senior
Indebtedness  in  full,  after  giving  effect  to  any  concurrent  payment  or
distribution to or for the holders of Senior Indebtedness.

          For purposes of this Article [One] only, the words "cash,  property or
securities," or any combination  thereof,  shall be deemed not to include shares
of capital stock of the Company as reorganized  or readjusted,  or securities of
the Company or any other corporation provided for by a plan of reorganization or
readjustment  the  payment  of which  is  subordinated,  at least to the  extent
provided in this Article [One] with respect to the Securities, to the payment of
all  Senior  Indebtedness  which  may  at the  time  be  outstanding  and to any
securities issued to the holders of Senior Indebtedness in respect of the Senior
Indebtedness under any such plan of reorganization or readjustment.

         SECTION [1.03].  Prior Payment to Senior Indebtedness upon Acceleration
of Securities.

          In the event that any  Securities  of any series are  declared due and
payable  before their [Stated  Maturity],  then and in such event the holders of
Senior  Indebtedness shall be entitled to receive payment in full of all amounts
due or to become due on or in respect of all Senior  Indebtedness  or  provision
shall be made for such payment in cash,  before the Holders of the Securities of
such series are entitled to receive any payment (including any payment which may
be payable by reason of the  payment of any other  indebtedness  of the  Company
being  subordinated  to the  payment of the  Securities  of such  series) by the
Company on account of the principal of (or premium or make-whole amount, if any)
or interest or other  amounts on  Securities of such series or on account of the
purchase or other acquisition of Securities of such series.

          In the event that,  notwithstanding  the foregoing,  the Company shall
make any  payment to the Trustee or the Holder of any  Securities  of any series
prohibited by the foregoing provisions of this Section [1.03], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

          The  provisions of this Section  [1.03] shall not apply to any payment
with respect to which Section [1.02] would be applicable.

          SECTION [1.04].  Default in Senior Indebtedness.

          In the event and during the continuation of any default by the Company
in the payment of principal,  premium, if any, interest or any other payment due
on any  Senior  Indebtedness  of the  Company,  as the case may be,  beyond  any
applicable grace period with respect thereto,  or in the event that the maturity
of any Senior  Indebtedness of the Company has been  accelerated  because of any
default,  then,  in any such case,  no payment shall be made by the Company with
respect to the principal (including  redemption payments, if any) of, premium or
make-whole  amount, if any, or interest or other amounts on the Securities until
such default is cured or waived or ceases to exist or any such  acceleration  or
demand for payment has been rescinded.

          In the event that,  notwithstanding  the foregoing,  the Company shall
make any  payment to the Trustee or the Holder of any  Securities  of any series
prohibited by the foregoing provisions of this Section [1.04], and if such facts
then  shall  have been  known or  thereafter  shall  have been made known to the
Trustee (as provided in Section  [1.11]) or to such Holder,  as the case may be,
pursuant  to the terms of this  Indenture,  then and in such event such  payment
shall be paid over and delivered forthwith to the Company by or on behalf of the
person   holding  such  payment  for  the  benefit  of  the  holders  of  Senior
Indebtedness.

          The  provisions of this Section  [1.04] shall not apply to any payment
with respect to which Section [1.02] would be applicable.

          SECTION [1.05].  Limitations on Acceleration and Enforcement.

          At any time when the Company  may not make  payments in respect of the
Securities  as a result  of the  application  of  Section  [1.04],  no Holder of
Securities will:

                   (a) accelerate  or cause or permit  the  acceleration  of the
         maturity  of any of the Securities; or

                   (b) commence,  cause the commencement  of,  participate in or
         support any action or proceeding  (whether at law or in equity) against
         the Company to recover all or any part of the indebtedness  represented
         by the Securities or any action to commence or prosecute any bankruptcy
         or similar  proceeding in respect of the Company  unless the holders of
         at least a majority in principal amount of the Senior Notes at the time
         outstanding (exclusive of Senior Notes then owned by the Company or any
         of its  subsidiaries  or  affiliates)  shall have  agreed in writing in
         advance to, and shall have joined in, such proceedings.

         SECTION [1.06].  Payment Permitted if No Default.

          Nothing contained in this Article [One] or elsewhere in this Indenture
or in any of the  Securities  shall prevent (a) the Company,  at any time except
during the pendency of any case, proceeding,  dissolution,  liquidation or other
winding up,  assignment  for the benefit of  creditors or other  marshalling  of
assets and liabilities of the Company referred to in Section [1.02] or under the
conditions  described in Sections [1.03] or [1.04],  from making payments at any
time of the principal amount,  interest or such other amounts, if any, as may be
provided  for  in  this  Indenture,  as the  case  may  be,  in  respect  of the
Securities, or (b) the application by the Trustee or the retention by any Holder
of any money  deposited with it hereunder to the payment of or on account of the
principal amount, interest or such other amounts, if any, as may be provided for
in this  Indenture,  as the case may be, in  respect  of the  Securities  if the
Trustee did not have, at the time provided in the proviso to the first paragraph
of Section  [1.11],  notice that such payment would have been  prohibited by the
provisions of this Article [One].

         SECTION [1.07].  Subrogation Rights of Holders of Senior Indebtedness.

          Subject to the payment in full of all Senior Indebtedness, the Holders
of the  Securities  of any  series  shall be  subrogated  to the  extent  of the
payments  or  distributions  made to the  holders  of such  Senior  Indebtedness
pursuant to the provisions of this Article [One] to the rights of the holders of
such Senior  Indebtedness to receive payments or distributions of cash, property
or securities  applicable to the Senior Indebtedness until the principal amount,
interest or such other amounts,  if any, as provided for in this  Indenture,  as
the case may be, in respect of the  Securities  of such series  shall be paid in
full.  For purposes of such  subrogation,  no payments or  distributions  to the
holders of the Senior  Indebtedness of any cash, property or securities to which
the Holders of the  Securities  of such series or the Trustee  would be entitled
except for the provisions of this Article [One], and no payments pursuant to the
provisions  of this  Article  [One] to the  Company or to the  holders of Senior
Indebtedness by Holders of the Securities of such series or the Trustee,  shall,
as between the Company,  its creditors other than holders of Senior Indebtedness
and the Holders of the  Securities of such series,  be deemed to be a payment or
distribution by the Company to or on account of the Senior Indebtedness.

         SECTION [1.08].  Provision Solely to Define Relative Rights.

          The  provisions of this Article [One] are and are intended  solely for
the purpose of defining the relative  rights of the Holders of the Securities of
any series,  on one hand, and the holders of Senior  Indebtedness,  on the other
hand.  Nothing contained in this Article [One] or elsewhere in this Indenture or
in the Securities of any series is intended to or shall:

                   (a)  impair,  as between  the  Company and the Holders of the
         Securities  of such series,  the  obligation  of the Company,  which is
         absolute and unconditional,  to pay to the Holders of the Securities of
         such series the principal  amount,  interest or such other amounts,  if
         any, as may be provided for in this  Indenture,  as the case may be, in
         respect  of the  Securities  of such  series as and when the same shall
         become due and payable in accordance  with the terms of the  Securities
         of such  series and this  Indenture  and  which,  subject to the rights
         under this  Article  [One] of the  holders of Senior  Indebtedness,  is
         intended to rank  equally  with all other  general  obligations  of the
         Company; or

                   (b) affect the  relative  rights  against  the Company of the
         Holders of the  Securities  of such series and creditors of the Company
         other than holders of Senior Indebtedness; or

                   (c) prevent the Trustee or the Holder of any Security of such
         series from exercising all remedies  otherwise  permitted by applicable
         law upon default under this Indenture,  subject to the rights,  if any,
         under  this  Article  [One] of the  holders of Senior  Indebtedness  to
         receive cash,  property or securities  otherwise payable or deliverable
         to the Trustee or such Holder.

         SECTION [1.09].  Trustee to Effectuate Subordination.

          Each  Holder  of  a  Security  by  such  Holder's  acceptance  thereof
authorizes  and directs the Trustee on such Holder's  behalf to take such action
as may be necessary or appropriate to effectuate the  subordination  provided in
this Article [One] and appoints the Trustee such Holder's  attorney-in-fact  for
any and all such purposes.

         SECTION [1.10].  No Waiver of Subordination Provision.

          No right of any present or future holder of any Senior Indebtedness to
enforce  subordination  as  herein  provided  shall  at any  time  in any way be
prejudiced  or  impaired by any act or failure to act on the part of the Company
or by any act or failure to act, by any such holder,  or by any noncompliance by
the  Company  with  the  terms,  provisions  and  covenants  of this  Indenture,
regardless  of any  knowledge  thereof any such holder may have or be  otherwise
charged with.

          Without in any way limiting the generality of the foregoing paragraph,
the  holders  of  Senior  Indebtedness  may,  at any time and from time to time,
without  the  consent  of, or notice  to,  the  Trustee  or the  Holders  of the
Securities of any series, without incurring responsibility to the Holders of the
Securities of such series and without  impairing or releasing the  subordination
provided in this Article  [One] or the  obligations  hereunder of the Holders of
the Securities of such series to the holders of Senior Indebtedness,  do any one
or more of the  following:  (i) change the manner,  place or terms of payment or
extend the time of payment  of, or renew or alter,  or  increase  the amount of,
Senior  Indebtedness,  or otherwise  amend or  supplement  in any manner  Senior
Indebtedness or any instrument  evidencing the same or any agreement under which
Senior Indebtedness is outstanding;  (ii) sell,  exchange,  release or otherwise
dispose of or deal with any property  pledged,  mortgaged or otherwise  securing
Senior  Indebtedness;  (iii)  release  any  person  liable in any manner for the
payment or  collection  of Senior  Indebtedness;  (iv)  exercise or refrain from
exercising any rights against the Company or any other person; and (v) apply any
sums paid in respect of Senior Indebtedness to Senior  Indebtedness,  regardless
of who made such payment or how such payment was realized.

         SECTION [1.11].  Notice to Trustee.

          The  Company  shall give prompt  written  notice to the Trustee of any
fact known to the Company  which would  prohibit the making of any payment to or
by the Trustee in respect of the Securities of any series.  Failure to give such
notice shall not affect the  subordination  of the  Securities of such series to
Senior Indebtedness. Notwithstanding the provisions of this Article [One] or any
other  provision  of this  Indenture,  the  Trustee  shall not be  charged  with
knowledge of the  existence of any facts which would  prohibit the making of any
payment to or by the Trustee in respect of the Securities of such series, unless
and until the Trustee shall have received  written  notice thereof in the manner
prescribed by this Indenture from the Company or a holder of Senior Indebtedness
or from any  trustee or agent  therefor;  and,  prior to the receipt of any such
written notice, the Trustee, subject to the provisions of Section [regarding the
duties and  responsibilities of the Trustee],  shall be entitled in all respects
to assume that no such facts exist; provided, however, that if the Trustee shall
not have received,  at least three Business Days prior to the date upon which by
the terms  hereof  any money may  become  payable  for any  purpose  (including,
without limitation, the payment of the principal amount, interest, or such other
amounts as may be provided for in this  Indenture  in respect of any  Security),
the notice with respect to such money provided for in this Section [1.11], then,
anything  herein  contained to the contrary  notwithstanding,  the Trustee shall
have the full power and authority to receive such money and to apply the same to
the purpose for which such money was  received  and shall not be affected by any
notice to the contrary  which may be received by it within three  Business  Days
prior to such date.

          Subject  to the  provisions  of  Section  [regarding  the  duties  and
responsibilities  of the Trustee],  the Trustee shall be entitled to rely on the
delivery  to it of a written  notice by a person  representing  himself  to be a
holder of Senior  Indebtedness  (or a trustee or agent on behalf of such holder)
to establish that such notice has been given by a holder of Senior  Indebtedness
(or a  trustee  or agent on behalf of any such  holder).  In the event  that the
Trustee  determines in good faith that further evidence is required with respect
to the right of any person as a holder of Senior  Indebtedness to participate in
any payment or  distribution  pursuant to this  Article  [One],  the Trustee may
request such person to furnish  evidence to the reasonable  satisfaction  of the
Trustee as to the amount of Senior  Indebtedness held by such person, the extent
to which such person is entitled to participate in such payment or  distribution
and any other facts  pertinent  to the rights of such person  under this Article
[One], and if such evidence is not furnished,  the Trustee may defer any payment
which it may be required to make for the benefit of such person  pursuant to the
terms of this Indenture  pending judicial  determination as to the right of such
person to receive such payment.

         SECTION [1.12].Reliance on Judicial Order or Certificate of Liquidating
Agent.

          Upon any payment or distribution of assets of the Company  referred to
in this  Article  [One],  the  Trustee,  subject  to the  provisions  of Section
[regarding the duties and  responsibilities of the Trustee],  and the Holders of
the  Securities of any series shall be entitled to rely upon any order or decree
entered  by any  court  of  competent  jurisdiction  in which  such  insolvency,
bankruptcy, receivership, liquidation,  reorganization,  dissolution, winding up
or similar case or  proceeding is pending,  or a  certificate  of the trustee in
bankruptcy,  liquidating trustee, custodian,  receiver, assignee for the benefit
of  creditors,  agent or other  person  making  such  payment  or  distribution,
delivered to the Trustee or to the Holders of Securities of such series, for the
purpose of ascertaining  the persons  entitled to participate in such payment or
distribution,  the holders of Senior  Indebtedness and other indebtedness of the
Company,  the amount thereof or payable  thereon,  the amount or amounts paid or
distributed  thereon and all other facts  pertinent  thereto or to this  Article
[One].

         SECTION [1.13].   Trustee    Not   Fiduciary   for  Holders  of  Senior
Indebtedness.

          The  Trustee  shall be  deemed  not to owe any  fiduciary  duty to the
holders of Senior Indebtedness.  The Trustee shall not be charged with knowledge
of the existence of Senior  Indebtedness (other than the Senior Notes) or of any
facts that would  prohibit any payment  hereunder  unless the Trustee shall have
received notice thereof in the manner prescribed by this Indenture. With respect
to the holders of Senior  Indebtedness,  the Trustee undertakes to perform or to
observe only such of its covenants or obligation as are  specifically  set forth
in this Article [One] and no implied  covenants or  obligations  with respect to
holders of Senior  Indebtedness  shall be read into this  Indenture  against the
Trustee.

         SECTION [1.14].  Rights  of  Trustee  as Holder of Senior Indebtedness;
Preservation of Trustee's Rights.

          The Trustee in its  individual  capacity  shall be entitled to all the
rights set forth in this Article  [One] with respect to any Senior  Indebtedness
which may at any time be held by it, to the same  extent as any other  holder of
Senior Indebtedness,  and nothing in this Indenture shall deprive the Trustee of
any of its rights as such holder.

          Nothing in this  Article  [One]  shall apply to claims of, or payments
to, the Trustee  under or pursuant to Section  [concerning  fees and expenses of
the Trustee].

         SECTION [1.15].  Article [One] Applicable to Paying Agents.

          The term  "Trustee"  as used in this Article  [One] shall  (unless the
context  otherwise  requires) be construed  as  extending to and  including  the
Paying  Agent within its meaning as fully for all intents and purposes as if the
Paying Agent were named in this Article  [One] in addition to or in place of the
Trustee;  provided,  however, that Sections [1.11] and [1.13] shall not apply to
the  Company or any  Affiliate  of the Company if it or such  Affiliate  acts as
Paying Agent.


<TABLE> <S> <C>


<ARTICLE>                     5

<S>                                      <C>

<PERIOD-TYPE>                                  9-MOS
<FISCAL-YEAR-END>                        DEC-31-1999
<PERIOD-END>                             SEP-30-1999
<CASH>                                         5,386
<SECURITIES>                                       0
<RECEIVABLES>                                 56,388
<ALLOWANCES>                                   1,108
<INVENTORY>                                        0
<CURRENT-ASSETS>                                   0<F1>
<PP&E>                                       207,726<F2>
<DEPRECIATION>                                56,573
<TOTAL-ASSETS>                               541,496
<CURRENT-LIABILITIES>                              0<F1>
<BONDS>                                      222,094
                              0
                                        0
<COMMON>                                         243
<OTHER-SE>                                   244,369
<TOTAL-LIABILITY-AND-EQUITY>                 541,496
<SALES>                                       96,625
<TOTAL-REVENUES>                              96,625
<CGS>                                          3,967
<TOTAL-COSTS>                                  3,967
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                             8,137
<INCOME-PRETAX>                               11,026
<INCOME-TAX>                                   4,577
<INCOME-CONTINUING>                            6,449
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                   6,449
<EPS-BASIC>                                    .27<F3>
<EPS-DILUTED>                                    .26

<FN>
<F1> The Company does not present a classified balance sheet; therefore, current
     assets and current liabilities are not reflected in the Company's financial
     statement.

<F2> PP&E does not include  seismic data bank assets with a cost of $610,853,000
     and related accumulated amortization of $287,528,000.

<F3> Reflects basic earnings per share.

</FN>


</TABLE>


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