NAME

     fxprep - Prepare Shot Records for FX Prestack Shot Migration

SYNOPSIS

     [-Nntap]  [-Ootap]  [-GINgin]  [-GOUTgout]   [-BRirec1]   [-
     ERirec2] [-IRincrec] [-MAXSTAmaxsta] [-V] [-?]  [-h]

DESCRIPTION

     fxprep reads shot records and a geometry file  created  with
     program prepmig and outputs shot records and a corresponding
     geometry file which can be input to the 2D FX shot migration
     program  fxsmig. Refer to the manual page for fxsmig. fxprep
     centers the output records about  the  shot  and  pads  dead
     traces.

  Command line arguments
     -Nntap
          Enter the dataset name of the input seismic data  after
          typing  -N. This input file should include the complete
          path name if the file resides in a different directory.
          Example  -N/b/vsp/dummy  tells  the program to look for
          file 'dummy' in directory 'vsp' stored on the 'b' disk.
          A  stdin pipe is assumed when this flag is missing from
          the command line.

     -Ootap
          Enter the dataset name of the output seismic data after
          typing  -O.  A stdout pipe is assumed when this flag is
          missing from the command line.

     -GINgin
          Enter the dataset name of the input geometry file after
          typing  -GIN.  This  dataset  is  the output of program
          prepmig. Refer to the manual page on prepmig.

     -GOUTgout
          Enter the dataset name  of  the  output  geometry  file
          after  typing -GOUT.  This dataset is the geometry file
          that matches the output shot records.

     -BRirec1
          This value is the first record to process.  Default  is
          1.

     -ERirec2
          This value is the last record to process.   Default  is
          all records.

     -IRincrec
          This value is the record increment.  Default is 1. When
          piping  from  fxprep  into fxsmig, the three flags -BR,
          -ER, and -IR for skipping records should be  used  ONLY
          in fxprep and omitted from fxsmig.

     -MAXSTAmaxsta
          This value represents  the  number  of  stations  in  a
          record. The default is 10000.

     -V   Enter -V for a verbose printout.

     -h   Enter -h for online help. The  program  will  terminate
          after printing this.

     -?   Enter -? for online help. The  program  will  terminate
          after printing this.

SEE ALSO

     mbs, fxsmig, prepmig, fxsns

BUGS

     None known.

AUTHOR

     N. D. Whitmore, Jr.; Ron D. Coleman, CETech; J. Cooperstein,
     CETech

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.