NAME

     ppfilt - Converts a  pressure  gradient  (PPG)  to  pressure
     (PSI),  applys  hydrostatic filter, and converts the results
     back to pressure gradient (PPG).

SYNOPSIS

     ppfilt [-N ntap] [-O otap] [-nhg nhg] [-dz dz] [-met] [-eng]
     [-V] [-?]  [-h]

DESCRIPTION

     ppfilt will create a filtered pressure gradient.  The filter
     rule is: pressure must increase with depth at a rate greater
     that or equal to the fluid gradient  given  on  the  command
     line.

  Command line arguments
     -Nntap
          Enter the name of the input pressure gradeient dataset.

     -Ootap
          Enter  the  name  of  the  output  filtered   gradeient
          dataset.

     -nhg nhg
          Enter the normal hydrostatic gradient (fluid  gradient)
          after typing -nhg. The default is .465 which is correct
          for the USA Gulf Coast area.

     -dz dz
          Enter the depth sample interval.

     -met If this flag is present on the command  line,  it  will
          indicate  that  the  depth  sample  rate from the input
          overburden gradient dataset is in meters/second.

     -eng If this flag is present on the command  line,  it  will
          indicate  that  the  depth  sample  rate from the input
          overburden gradient dataset is in feet/second.

          Note:  Units must be specified on the command line.

     -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

     pptrnehz, ppetn, ppg2psi, psi2ppg, ppfilt,  psifilt3,  ptop,
     fillhdr, gradfilt, mshowray

BUGS

     None known.

AUTHORS

     N. D. Whitmore, Jr., Mary Ann Thornton, M. L. Albertin

COPYRIGHT

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