NAME

     stacklay  - module to do overlay of pick  event  on  seismic
     data

SYNOPSIS

     stacklay [ -Nntap ] [ -Ootap ] [ -vvtap  ]  [  -Mmtype  ]  [
     -ordnum  ] [ -dxdist ] [ -dtmul ] [ -fsisp ] [ -incspinc ] [
     -S ] [ -F ] [ -V ] [ -? or -h  ]

DESCRIPTION

     stacklay given an  XSD  pick file of  primary  events,  gen-
     erates  an   XSD  pick file of multiple reflection locations
     of those primary events.  It requires  an  average  velocity
     dataset,  indexed identical to the stack from which the pri-
     maries where picked.  The stacked section may  be  a  single
     multi-trace record or many single trace records.  The output
     multiple segments take on the same color as the  input  pri-
     mary  from  which they where obtained.  The program uses the
     rms velocity dataset to calculate depth, and  hence  dip  on
     the  primary,  so  as to do the proper math for multiples of
     dipping events.  The multiples are labeled as  such  in  the
     output pick file.

INPUT

     stacklay gets both its data and parameters from command line
     arguments.   These  arguments specify the input, output pick
     file names, the input average  velocity  dataset  name,  the
     pick  file  type  flag,  the  trace to trace distance on the
     stack from which the pick file was taken, the order of  mul-
     tiple to consider, pick file time unit override, the initial
     shot point and shot point interval  overrides,  a  zero  dip
     flag,  and  a  single  multiple  flag.   Verbose printout is
     available.

  Command line arguments
     -N ntap   [default: none]
          Enter the input  XSD  pick file name immediately  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 '/b/vsp'.

     -O otap   [default: none]
          Enter the output   XSD   pick  file  name   immediately
          after  typing -O. The output data set also requires the
          full path name (see above).

     -v vtap   [default: none]
          Enter  the  input   AVERAGE  VELOCITY   dataset    name
          immediately  after typing -v.  The input file name also
          requires the full path  name  (see  above).   The  file
          indexing  should  correspond  exactly to the stack from
          which the input pick file was taken.  If  this  is  not
          true, unpredictable results are sure to follow.

     -M flag    [default: pick]

           Enter : header (pick file is a file of  header  values
          at picks)
                   pick (pick file is a standard xsd pick file)

     -ord num   [default: 1]
          Enter the order of multiple for processing.

     -dx dist   [default: 25.0]
          Enter the trace to trace distance  [ft  or  m]  on  the
          stack from which the input pick file was taken.

     -dt mul     [default: 1]
          Enter pick file time unit multiplier.  If unused,  pick
          file times will be unaffected.

     -fs isp     [default: option not used]
          Enter the record number to be  used  in  place  of  the
          first pick file record value.

          WARNING ...... if you use this  option  you  must  also
          include -inc.

     -inc spinc  [default: option not used]
          Enter the shot point increment  to  use  between  input
          pick segments (see -fs).

     -F   Enter the command line argument '-F'  for  stacklay  to
          assume  zero  reflector dip; output multiple times will
          be integral  multiples  of  the  corresponding  primary
          time.

     -S   Enter the command line argument '-S'  for  stacklay  to
          generate  only  the  order  of  multiple requested [see
          above].  The default is to generate all orders of  mul-
          tiples up to and including the order specified above.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -?   Enter the command line argument  '-?'   or  -h  to  get
          online  help.   The  program  terminates after the help
          screen is printed.

BUGS

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved

          an affiliate of BP America Inc.