NAME

     sqavou  - module to do Semi-Quantitative AVO

SYNOPSIS

     sqavou [ -Nntap ] [ -Ootap ] [ -vardin ] [ -as ] [ -ai  ]  [
     -rs ] [ -re ] [ -ws ] [ -we ] [ -to ] [ -dof ] [ -md ] [ -em
     ] [ -s ] [ -vpvs ] [ -dead ] [ -disco ] [ -cdp ] [ -? ]

DESCRIPTION

     sqavou takes selected portions of trace data and does a hil-
     bert  transform  or  optionally  computes the envelope for a
     number of frequency bands.

     Hilb gets both its data and its parameters from command line
     arguments.   These  arguments specify the input, output, the
     start and end times, the start and end traces, and the start
     and  end  records.   Internally,  the  program  does  angle-
     dependent stacking on the input data file, in the  same  way
     as program ANGST.  Thus many of the specified parameters are
     the same as those used for ANGST.

  Command line arguments
     -N ntap
          Enter the input data set name or file 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
          Enter the output data  set  name  or  file  immediately
          after typing -O.  This output file is not required when
          piping the output to another process.  The output  data
          set also requires the full path name (see above).

     -v cardin
          Enter the TDFN card file name immediately after  typing
          -v.   This  file  should contain the TDFN velocity card
          images.

     -as angbeg
          Enter the start angle for the ANGST  angle  stack  rou-
          tine.  The default is 0.

     -ai anginc
          Enter the angle increment for  the  ANGST  angle  stack
          routine.  The default is 15 degrees.

     -rs irs
          Enter the start record  number.   The  default  is  the
          first record. If spacial windowing is used, both rs and
          re parameters should be supplied.

     -re ire
          Enter the ending record number.   The  default  is  the
          last  record. If spacial windowing is used, both rs and
          re parameters should be supplied.

     -ws ws
          Enter the window start time used for spacial windowing.
          The  default  is the beginning of the trace. If spacial
          windowing is used, both rs and re parameters should  be
          supplied.

     -we we
          Enter the window end time used for  spacial  windowing.
          The default is the end of the trace. If spacial window-
          ing is used, both rs and re parameters should  be  sup-
          plied.

     -to to
          Enter the desired output type (either 1 or 2).  Type  1
          (default)  is  for Delta Rock properties, type 2 is for
          Bortfeld Coeffcients.

     -dof dof
          Enter the desired degree of fit (either 2 or 3). Dof of
          2  will  use the equations for a two parameter solution
          while a dof of 3 (default) will use the three parameter
          equations.

     -md mode
          Enter the desired solution mode (either 0, 1, or 2).  A
          mode  of 0 will use straight ray approximations, a mode
          of 1 will use curved ray approximations, and a mode  of
          2  will  use  perturbed  curved ray approximations.  No
          default.

     -em angl
          Enter the desired angles flag  (either  0  or  1).   An
          angles  flag of 0 (default) uses incident angles, while
          an angles flag of 1 uses emergent angles.

     -s vscale
          If present, velocity are multiplied by  this  constant.
          Default is 1.0.

     -vpvs vpvs
          If present, this value for Vp/Vs ratio will be used  in
          the three parameter calculations.  Default is 2.0.

     -dead
          If present, zero-valued stack traces  are  not  flagged
          "dead".  Default is NO.

     -disco
          If present, velocity card images are in  DISCO  HANDVEL
          format.  Default is NO.

     -cdp If present, velocity and angle functions are  keyed  to
          CDP, not RI number.  Default is NO.

     -?   Enter the command line argument  '-?'  to  get  on-line
          help  screen.   The  program  stops  after printing the
          screen.

COPYRIGHT

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