NAME
morfgam - warp semblance panels to simulate post-residual
analysis
SYNOPSIS
morfgam [ -N1vtap1 ] [ -N2vtap2 ] [ -N3ntap ] [ -Ooutput ] [
-nsns ] [ -nene ] [ -rsrs ] [ -rere ] [ -ioptiopt ] [
-vminvmin ] [ -vmaxvmax ] [ -P1stkpick ] [ -P2smbpick ] [
-P3smbpcko ] [ -dgammadgamma ] [ -ngammangamma ] [ -ppow ] [
-V ] [ -? ] [ -h ]
DESCRIPTION
morfgam reads two mbs-compatible depth-interval velocity
fields, a set of semplance panels, horizon picks in xsd-
format, horizon-based semblance picks in xsd-format, and
some parameters to control the velocity inversion. It out-
puts both an updated set of semplance panels and updated
semblance picks.
morfgam gets the input and output file names and parameters
from the command line.
Command line arguments
-N1vtap1
Enter the name of the mbs-compatible velocity field
that was used in the migration after typing -N1. This
file is usually created with a velocity model-building
program like either xsd, xvedit, or velin. This input
file should include the complete path name if the file
resides in a different directory. Example
-N/b/vsp/dummy tells the program to look for file
'dummy' in directory 'vsp' stored on the 'b' disk.
-N2vtap2
Enter the name of the mbs-compatible velocity field
that was updated by residual analysis after typing -N2.
This file is usually created with a velocity model-
building program like either xsd, xvedit, or velin.
This input file should include the complete path name
if the file resides in a different directory. Example
-N/b/vsp/dummy tells the program to look for file
'dummy' in directory 'vsp' stored on the 'b' disk.
This field is not required if iopt=2.
-N3ntap
Enter the name of the usp-compatible semblance panels
after typing -N3. This file is usually created with
program xsdprop. This input file should include the
complete path name if the file resides in a different
directory. Example -N/b/vsp/dummy tells the program to
look for file 'dummy' in directory 'vsp' stored on the
'b' disk.
-Ootap
Enter the updated output velocity file name immediately
after typing -O. The output semblance file requires
the full path name (see above).
-rsrs
Enter the starting record number after typing -rs.
-rere
Enter the ending record number after typing -re.
-nsns
Enter the starting trace after typing -ns.
-nene
Enter the ending trace after typing -ne.
-ioptiopt
Enter either a 1 or a 2 after typing iopt. By way of
explanation, remember that spectra (or gamma scans) can
be produced after depth migration. Gamma is a ratio of
new slowness to old slowness. If you produce a new
velocity field through some type of inversion (i.e.,
Dix), you can compute what the new spectra would look
like if you computed new spectra after residual moveout
with the new field. This program can approximate this
procedure. In fact, that is what opt=1 does. Opt=2,
on the other hand, can produce spectra that are
constant-slowness scans as a function depth. These
slowness scans can be turned into velocity spectra with
slow2vel and can also be converted to be a function of
time instead of depth with panlz2t. (Default=1).
-vminvmin
Enter the minimum velocity for the output slowness scan
after typing -vmin. Thi s argument is used only when
iopt=2.
-vmaxvmax
Enter the maximum velocity for the output slowness scan
after typing -vmin. Thi
-P1stkpick
Enter the first input xsd pick file name immediately
after typing -P1. This file should have been created
by program xsdintrp on an xsd segment file. To create
the xsd segment file, you should plot the depth-
migrated stack with program xsd, and pick the key hor-
izons on the stack. If you have an xsd segment file
from a time-section, you can convert the picks from
time to depth with program xsdt2d.
-P2sempick
Enter the second input xsd pick file name after typing
-P2. This file should have been created by program
xsdintrp on an xsd segment file. To create the xsd
segment file, you should plot the records from program
horgam with program xsd, and pick the maximum sem-
blances along each key horizon.
-P3smbpcko
Enter the output xsd pick file name after typing -P3.
This file will map onto the output semblance panels and
will reflect the velocities of the updated velocity
field.
-dgammadgamma
Enter the increment between gammas. The default is
0.20. If you have 30 gammas, then the default gamma
scans will be +/- 30 percent because 15 (30/2) times
.020 is .3. The gamma value is a ratio of new to old
slownesses. If gamma is smaller than one, the new
slowness will be less than the old slowness; therefore,
the velocities are implied to be faster.
-ngammangamma
Enter the number of gamma scans. The default is the
number of traces per input record.
-ppow
Enter the exponent for dix inversion. An exponent of
2, implies rms velocities, and an exponent of 1 implies
average velocities. Only values between 1 and 2 are
legitimate. The default is .1.
-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
xsdd2t, xsdt2d, xsdintrp, horgam, xsd2xtpick, appgam, norm,
envelop, panlz2t, slow2vel
BUGS
Unknown
AUTHOR
Gary Murphy
COPYRIGHT
copyright 2001, Amoco Production Company
All Rights Reserved
an affiliate of BP America Inc.
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