NAME

     pwrmxz - Model Based Plane Wave Residual Depth Moveout

SYNOPSIS

     pwrmxz    [-Nmigdepth1]     [-Omigdepth2]     [-v1velocity1]
     [-v2velocity2] [-Iincrement] [-npnang] [-isflag]

DESCRIPTION

     pwrmxz performs flat dip corrections on migrated depth  data
     by  computing model-based residual moveout.  By user option,
     this residual moveout can be performed on  migrated  stacked
     sections  or  on  pre-stack plane wave migrated panels.  The
     user provides the program with the migrated data, the  velo-
     city  field  used  in  the  migration,  and the new velocity
     field.  The program compares the old and new velocity fields
     and calculates flat dip corrections to the depth sections or
     panels.  The velocity field does not necessarily have to  be
     flat,  but  this residual correction performs best with only
     small lateral velocity variations.

  Command line arguments
     -N migdepth1
          Enter the name of the USP-formatted input dataset after
          typing -N.
             post-stack:  enter the name of the migrated stacked
                          depth section.
             pre-stack:   enter the name of the dataset containing
                          migrated sorted depth panels (sorted
                          output from programs kmpw and sns).

     -O migdepth2
          Enter the name of the output dataset after  typing  -O.
          This is a USP-formatted dataset and resembles the input
          in data structure.

     -v1 velocity1
          Enter the name of the  velocity  dataset  used  in  the
          migration  after  typing  -v1.  This is a USP-formatted
          dataset where sample values are interval velocities.

     -v2 velocity2
          Enter the name of the new velocity dataset to  be  used
          for  calculating  residuals after typing -v2. This is a
          USP-formatted dataset where sample values are  interval
          velocities.

     -I increment
          After typing -I, enter the panel spacing  of  the  sort
          which produced the angle sorted records.  This value is
          the same as the number of traces skipped (if any)  dur-
          ing  the  sort  (sns).  This  parameter  is ignored for
          post-stack data.

     -np nang
          Enter the number of angles (kmpw parameter) which  were
          migrated  after  typing -np.  This parameter is ignored
          for post-stack data.

     -is flag
          Indicate whether this is pre-stack or  post-stack  data
          by  entering  a flag value after typing -is.  This flag
          indicates whether or not to ignore the angle.
             0 = do not ignore the angle (data is pre-stack)
             1 = ignore the angle and depth correct (data is
                 post-stack)

BUGS

     None known.

AUTHOR

     N. D. Whitmore, Jr.

COPYRIGHT

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