NAME

     ppdenobg - Compute an Overburden Gradient Field from a  Den-
     sity Field

SYNOPSIS

     ppdenobg [-DENntap] [-OBGotap] [-nsns] [-nene]  [-rsirs]  [-
     reire] [-V] [-?]  [-h]

DESCRIPTION

     Given a density field this program will compute an  overbur-
     den  pressure  gradient for each depth point of the velocity
     model.

     ppdenobg gets its dataset names and its parameters from com-
     mand  line arguments.  This program expects the header value
     "Dz1000" to be present in the line header.   The  input  and
     output datasets are USP formatted.

  Command line arguments
     -DENntap
          Enter the name of the input density field after  typing
          -DEN.  This input file should include the complete path
          name if the file  resides  in  a  different  directory.
          Example  -L/b/vsp/dummy  tells  the program to look for
          file 'dummy' in directory 'vsp' stored on the 'b' disk.
          The  density  dataset should be in grams/cubic centime-
          ter.

     -OBGotap
          Enter the name of the output overburden gradient  field
          after typing -OBG.  This dataset also requires the full
          pathname (see above).

     -nsns
          Enter the trace number of the first  trace  to  process
          after  typing  -ns.   The  default  is to use the first
          trace of the record.

     -nene
          Enter the trace number of the  last  trace  to  process
          after typing -ne.  The default is to use the last trace
          of the record.

     -rsirs
          Enter the record number of the first record to  process
          after  typing  -rs.   The  default  is to use the first
          record of the dataset.

     -reire
          Enter the record number of the last record  to  process
          after  typing  -re.   The  default  is  to use the last
          record of the dataset.

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

     -?   Enter this (or '-?' if you are running in  c-shell)  to
          get  online  help.   The  program  will terminate after
          printing this.

     -h   Enter this option to get online help.  The program will
          terminate after printing this.

SEE ALSO

     vel2den, ppvtrn, pptrnehz, ppetn

BUGS

     None known.

AUTHOR

     Mary Ann Thornton

COPYRIGHT

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