NAME

     ppetn - Predict a Pressure Field Using Eaton's Method

SYNOPSIS

     ppetn [-VELntap] [-OBGntap2] [-VTRntap3]  [-PRotap]  [-nsns]
     [-nene]  [-rsirs] [-reire] [-nhgnhg] [-met] [-eng] [-V] [-?]
     [-h]

DESCRIPTION

     Given a velocity field, an overburden gradient field  and  a
     velocity  trendline ppetn will use Eaton's method to predict
     a geopressure magnitude field. The three input datasets  and
     the  output  dataset  are USP formatted.  The input datasets
     must have the same number of records, traces,  and  samples.
     The velocity field and the velocity trendline must be in the
     same units, either metric or english.

     ppetn gets its dataset names and its parameters from command
     line  arguments.   This  program  expects  the  header value
     "Dz1000" to be present in the line header.

  Command line arguments
     -VELntap
          Enter the name of the input velocity field after typing
          -VEL.  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.

     -OBGntap2
          Enter the name of the input overburden  gradient  field
          after typing -OBG.  This dataset also requires the full
          pathname (see above).

     -VTRntap3
          Enter the name of the input velocity trendline  dataset
          after typing -VTR.  This dataset also requires the full
          pathname (see above).

     -PRotap
          Enter the name of the output pressure field after  typ-
          ing  -PR.  This dataset also requires the full pathname
          (see  above).   The  pressure  dataset   will   be   in
          pounds/gallon.

     -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.

     -nhgnhg
          Enter the  normal  hydrostatic  gradient  after  typing
          -nhg.   The  default  is  (.465)  psi/ft  which  is the
          correct gradient for the U.S.A. Gulf Coast area.

     -met If this flag is present on the command  line,  it  will
          indicate that the input velocity field and the velocity
          trendline are in metric units.

     -eng If this flag is present on the command  line,  it  will
          indicate that the input velocity field and the velocity
          trendline are in English units.

          Note:  Either the -met or -eng flag must
                 be present 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

     vel2den, ppdenobg, pptrn, pptrnehz, ppobgmt

BUGS

     None known.

AUTHOR

     Mary Ann Thornton

COPYRIGHT

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