NAME

     gexp - exponentiate seismic amplitudes

SYNOPSIS

     gexp [ -Nntap ] [ -Ootap ] [ -rsirs ] [ -reire ] [ -? ] [ -h
     ]

DESCRIPTION

     GEXP reads user-specified seismic data and exponentiates  to
     create an output data set with magnitudes given by

                          y(t) = exp(x(t))

     where x(t) is the input data.

     This program is useful for converting running  sum  integra-
     tion  output  to  impedance  values.   Care must be taken to
     scale the input such that the exponentiation does not  over-
     flow.  Testing of various scalers is appropriate.

     A typical flow might be: intdg -N indata | filt -ormsby  -f1
     1 -f2 3 | gexp -O outdata

     Program scale might need to be inserted in the flow  to  get
     the  inpedance values to come out right. Here it's important
     to have some sort of well information to callibrate.

     Program GEXP gets both its data and its parameters from com-
     mand  line arguments.  These arguments specify the input and
     output data set names, the beginning and  ending  sequential
     record numbers for processing, and the RMS average flag.

  Command line arguments
     -Nntap
          Enter the input data set name or file immediately after
          typing  -N;  entering  nothing  specifies a stdin pipe.
          This input put file should include  the  complete  path
          name  if the file resides in a directory other than the
          one  from  which  you  start  the  program.    Example:
          -N/work_area/dummy  tells  the program to look for file
          "dummy" in directory "work_area".

     -Ootap
          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).

     -rs irs
          (integer) First (sequential) record  to  process.   All
          records  prior  to this one are skipped and not written
          to the output data set. Default = 1 (the first).

     -re ire
          (integer) Last (sequential)  record  to  process.   All
          records  after  this are ignored and not written to the
          output data set. Default = process all.

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

     -h   Enter this to get online help.  The program  will  ter-
          minate after printing this.

BUGS

     Unknown

AUTHOR

     Richard Crider, Houston x7070

COPYRIGHT

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