NAME
scorusp - Compute/apply static corrections (same as scor)
SYNOPSIS
scorusp [ -Nntap ] [ -Ootap ] [ -Eetap ] [ -M ] [ [ -Ccrdin
] [-bd base] [-fld cfold] [-spl igrp] [-ni niters] [-sm
smooth] [-rs, -re frec, lrec] [-ir ieqwlr] [-wt weight] [-
apl ishift] [-hed iheadr] [-trd kubic] [-Hw ihdwrd] ]
DESCRIPTION
scorusp computes a set of surface-consistent initiation and
reception statics that will give optimum alignment of traces
within each common depth point (CDP) gather of the ntap.
The program arrives at the static corrections by a Gauss-
Seidel iterative technique. The applied trace shifts
default to the nearest whole sample, with a fractional sam-
ple shift available as an option. An event file generated
by program pickusp is required as input to scorusp.
Command line arguments
-Nntap
The path of an SIS format 3 file. If this field is
missing, standard input will be read if it is connected
to a pipe. If the file can not be accessed, an error
exit is taken.
-Eetap
The path of an SIS format 5 event file created by
pickusp. If this field is missing, i.e. a pipe is
assumed then the program aborts. The only time this
entry can be a socket or pipe is if it is running
inside ikp
-M If present on the command line, static values are writ-
ten into the header words in microseconds instead of
milliseconds
-Ccrdin
Note: it is recommended that the command line method of
parameter input be used. The card option is provided
for backwards compatibility only. The path of a file
containing a 1SCOR card (see below). If this field is
missing, it is assumed that startjob is being used and
the command string -scor.crd will be searched for. If
neither of these is provided parameter input is assumed
to come exclusively from the command line.
1SCOR CARD
A single 1SCOR card must be provided to control the opera-
tion of scorusp. The (fixed) fields on this card are
described below.
(cc 1- 5) - 1SCOR
The literal characters 1SCOR must appear as the first
five characters of the card. Note that these charac-
ters must be in upper case.
(cc 6-10) - Base distance
Base distance, in feet or meters, to determine residual
normal move-out (RNMO). Should be equal to farthest
offset. If this field is blank or 0, the default is
5000.
(cc 13-15) - Fold
Fold of the input eventfile. This entry should equal
the fold used by pickusp. If this field is blank or 0,
the default is the fold from the line header of the
eventfile.
(cc 20-20) - Source point location
Specifies the position of source points. If blank or
0, the source point is on the group. If 1, the source
point is between groups. If 3, 3-D processing will be
done.
(cc 24-25) - Number of iterations
Number of iterations to perform to reach solution. The
default depends on the type of processing. For 2-D
processing, the default is 20 if this field is blank or
0. For 3-D processing, the default is 1.
(cc 27-30) - Number of points to smooth RNMO
Number of CDPs used to smooth RNMO values. This entry
should be an odd number less than or equal to the
number of CDPs for the line. If the entry is even,
scorusp uses one less than the value entered. If this
field is blank or 0, the default is 999.
(cc 31-35) - First eventfile record to process
If blank or 0, the default is the first record in the
eventfile.
(cc 36-40) - Last eventfile record to process
If blank or 0, the default is the last record in the
eventfile.
(cc 55-55) - Initiation statics
Indicates how initiation statics are determined. If
not blank or 0, initiation statics equal reception
statics.
(cc 59-59) - Apply statics?
This is new. Blank or 0 = do apply statics to input
data; 1 = do not apply statics (but statics will be
written into static word of your choice.
(cc 60-60) - Ignore weighting from program pickusp
If blank or 0, the weights calculated by pickusp will
be applied.
(cc 61-61) - Apply header statics
If not blank or 0, header statics (words 125 and 126)
will be applied in addition to computed statics.
(cc 63-65) - Statics application word
This is new. Position in the trace header to put the
static. If left blank the default is header word 125.
Note: if the micro second units option is selected it
is quite likely that statics numbers will exceed the
storeage capability of I*2 (32767). Therefore if this
option is chosen the static values will be stored in
trace header full word 2 (mnemonic = SGRNum). The
application of the static to the trace (see Apply stat-
ics mode above) will not be affected.
(cc 69-75) - Job number
Optional; should agree with the job number in the line
headers of the input files if supplied.
(cc 80-80) - Remove cubic trend
The interpretation of this entry depends on the type of
processing. For 2-D processing, blank or 0 results in
the removal of the cubic trend. For 3-D processing,
blank or 0 suppresses the removal. This correction, if
applied, provides the removal of any low frequency
drift component from the static pattern.
Optional Command Line Arguments
-bd base
Base distance (ft,m). Default = 5000
-fld cfold
Event tape fold. Default = line header entry.
-spl igrp
Source point location: 0 = group center; 1 = between
groups; 3 = 3-d data
-ni niters
Number of iterations. Default = 20 (if 2-d data); = 1
(if 3-d data)
-sm smooth
Number of points to smooth rnmo (cdp's) - must be odd.
Default is whole gather (999)
-rs, -re frec, lrec
Starting and ending record on event tape. Default is
first and last.
-ir ieqwlr
0 = initiation static not equal to reception; 1 = ini-
tiation equals reception (def = 0)
-wt weight
weighted solution: 0 = yes; 1 = no (def = 0)
-apl ishift
0 = apply static to data; 1 = do not apply static (def
= 0)
-hed iheadr
1 = apply header statics also; 0 = do not apply header
statics (def = 0)
-trd kubic
0 = remove cubic trend from statics; 1 = do not remove
trend (def = 0)
-Hw ihdwrd
Trace header word mnemonic into which to put static
(in ms). Default = StaCor. Note: if the micro second
units option is selected it is quite likely that stat-
ics numbers will exceed the storeage capability of I*2
(32767). Therefore if this option is chosen the static
values should be stored in trace header full word
mnemonic (default = SGRNum). The application of the
static to the trace (see Apply statics mode above) will
not be affected.
SEE ALSO
pickusp, startjob, Amoco Seismic Information System User
Manual (yellow book)
BUGS
The UNIX implementation of scorusp does not support the
spooling of generated 8STAT and 9CORR cards to a VM machine,
although these cards appear in the listingfile. Use of TIME
files created by program tido is not supported. A command
line option letter and its corresponding argument may not be
separated by whitespace.
COPYRIGHT
copyright 2001, Amoco Production Company
All Rights Reserved
an affiliate of BP America Inc.
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