NAME

     sc3d - Compute static corrections for 3-D seismic data.

SYNOPSIS

     sc3d [ -Netap ] [ -Oofile ] [ [ -Ttimesl  ]  [-minli  nsmli]
     [-maxli   nlrli]  [-mindi  nsmdi]  [-maxdi  nlrdi]  [-minoff
     nnrrng] [-maxoff nfrrng] [-minaz nazsm] [-maxaz nazlr]  [-wt
     nupwfg]  [-mod  modefg]  [-alt  nalpfg] [-niprior npiter] [-
     nithru mxloop] [-niafter nfiter] [-pre sigin] [-prnt nprtfg]
     [-disco] [-amp] [-V] ]

DESCRIPTION

     sc3d computes a set  of  surface-consistent  initiation  and
     reception  statics.   The  program  arrives  at  the  static
     corrections by a Gauss-Seidel iterative technique.  An event
     file  generated  by  program  picker is required as input to
     sc3d.  This implemention does NOT apply the  computed  stat-
     ics,  but outputs a flatfile containing the 8STAT/9CORR card
     images.  These are input to usp program storeit to  put  the
     corrections  in the trace headers, and then usp program rest
     (remember to use the -u0.01  command  line  parameter)  will
     apply the statics.

     sc3d can also be used to compute a set of surface-consistent
     amplitude  corrections.  It uses the same logic as described
     above for statics.  The input event file generated  by  pro-
     gram  picker  must have been generated using the -amp option
     in picker.  The computed amplitude  correction  scalars  are
     input  to  usp program storeit to put the corrections in the
     trace headers, and then usp program rest applies the correc-
     tions.   Do  not  use a scalar (-u) in storeit for amplitude
     corrections.

  Command line arguments
     -Netap
          The path of an SIS  format  3  event  file  created  by
          picker.  If this field is missing, a pipe is assumed.

     NOTE: This new version of sc3d will not be able to read  any
     old format 5 files created by the old version of picker.  If
     you have old pick files,  you  will  need  to  rerun  picker
     before running sc3d.

     -Oofile
          The path of a "flat" file to  contain  the  8STAT/9CORR
          card images containing the computed statics, multiplied
          by 100.  If this field is missing, standard output will
          be written (i.e., piped output).  This file may only be
          piped outside of an IKP net --  piping  won't  work  at
          present  in  IKP.   The  only program that you can pipe
          this file into is storeit.

  Optional Command Line Arguments
     -Ttimesl
          The path of an  SIS  format  3  file.   ***THIS  IS  AN
          OPTIONAL  OUTPUT.***  The bin-oriented solution vectors
          (C, M, E, and F) are written as time-slice records with
          each array (vector) equivalent to one time slice.

     -minli nsmli
          Minimum LI to use. (default = 1)

     -maxli nlrli
          Maximum LI to use. (default = 9999)

     -mindi nsmdi
          Minimum DI to use. (default = 1)

     -maxdi nlrdi
          Maximum DI to use. (default = 9999)

     -minoff nnrrng
          Minimum offset to use. (default = 0)

     -maxoff nfrrng
          Maximum offset to use. (defualt = 99999)

     -minaz nazsm
          Minimum azimuth to use. (default = 0)

     -maxaz naxlr
          Maximum azimuth to use. (default = 180)

     -wt nupwfg
          Weighted solution:  0=yes, 1=no (default = yes)

     -mod modefg
          Mode of solution: (default = 3)
                    (1 -- I + R = T)
                    (2 -- I + R + C + M = T)
                    (3 -- I + R + C + M + E + F = T)

     -alt nalpfg
          Alternate pick substitution flag:  0=yes, 1=no (default
          = no)

     NOTE:
          The next three  parameters  (-niprior,-nithru,-niafter)
          are  only  valid  if "Alterate pick substitution flag =
          yes".

     -niprior npiter
          Iterations prior to alternate picks (default = 3)

     -nithru mxloop
          Iterations through alternate picks (default = 1)

     -niafter nfiter
          Iterations after alternate picks  (default = 5)

     -pre sigin
          Percent for prewhitening of main  diagonal  (default  =
          1.0)

     -prnt nprtfg
          Print solution vectors? 0=no,1=yes (default is yes)

     -disco
          Output Disco SHT-STAT/REC-STAT card images  to  a  file
          (<ofile>.disco), and to the listingfile. (default is no
          Disco-format output)

     -amp Compute   surface-consistent    amplitude    correction
          scalars, and write SHT-AMPL/REC-AMPL card images to the
          specified output file.

     -V   Output the rejected ri/tr information to  the  printout
          file.   (default  is to not output this information; it
          makes for very long files).

SEE ALSO

     picker, storeit, startjob, Amoco Seismic Information  System
     User Manual (yellow book)

BUGS

     The UNIX implementation of sc3d does not support the  spool-
     ing  of  generated  8STAT  and  9CORR cards to a VM machine.
     These card images are output to a flatfile designated by the
     -O  flag  (or can be piped into USP program storeit).  These
     card images will also appear in the listingfile.   The  user
     may  desire to output Disco format images also, and this can
     be done using the -disco flag, which will output the  images
     to  a flatfile called <ofile>.disco, and to the listingfile.
     If the output is piped into storeit, then  the  Disco-format
     flatfile will be called sc3d.disco.

AUTHORS

     Don Wagner, APR, x3281; Marilyn Miller, APR, x3593

COPYRIGHT

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