SUKDSYN2D - Kirchhoff Depth SYNthesis of 2D seismic data from a migrated seismic section

sukdsyn2d infile outfile [parameters]

Required parameters:
infile=stdin input migrated section
outfile=stdout file for output seismic traces
ttfile file for input traveltime tables

The following 9 parameters describe traveltime tables:
fzt first depth sample
nzt number of depth samples
dzt depth interval
fxt first lateral sample
nxt number of lateral samples
dxt lateral interval
fs x-coordinate of first source
ns number of sources
ds x-coordinate increment of sources

The following 6 parameters describe the migration section:
fz= first z-coordinate in migrated section
dz= vertical spacing of migrated section
nz= number of depth points in migrated section
fx= first x-coordinate of migrated section
dx= horizontal spacing of migrated section
nx= number of lateral points in migrated section

Optional Parameters:
nt=501 number of time samples
dt=0.004 time sampling interval (sec)
ft=0.0 first time (sec)
nxo=1 number of source-receiver offsets
dxo=25 offset sampling interval
fxo=0.0 first offset
nxs=101 number of shotpoints
dxs=25 shotpoint sampling interval
fxs=0.0 first shotpoint
fmax=1/(4*dt) maximum frequency in migration section (Hz)
aperx=nxt*dxt/2 modeling lateral aperature
angmax=60 modeling angle aperature from vertical
v0=1500(m/s) reference velocity value at surface
dvz=0.0 reference velocity vertical gradient
ls=1 flag for line source
jpfile=stderr job print file name
mtr=100 print verbal information at every mtr traces

Notes:
This program takes a migrated seismic section and a set of travel time
tables generated using rayt2d for a specific background velocity model
and generates synthetic seismic data in the form of common shot gathers.
(Common offset gathers may be generated by using nxo=1.)

This program is a tool which may be used for the migration residual
statics estimation technique of Tjan, Audebert, and Larner 1994.

1. The traveltime tables are generated by program rayt2d (or other ones)
on relatively coarse grids, with dimension ns*nxt*nzt. In the
modeling process, traveltimes are interpolated into shot/geophone
positions and migration section grids.
2. The input migration section must be an array of binary floats (no SU
headers). ",
3. The synthesized traces are output in common-shot gathers in SU format.
4. The memory requirement for this program is about
(ns*nxt*nzt+nx*nz+4*nr*nzt+3*nxt*nzt)*4 bytes
where nr = 1+min(nxt*dxt,0.5*offmax+aperx)/dxo.


Author: CWP: Zhenyue Liu, 07/24/95, Colorado School of Mines

References:

Tjan, T., F. Audebert, and K. Larner, 1994,
Prestack migration for residual statics estimation in complex media
(Appeared in 1994 Project Review, CWP-153.)

Tjan, T., 1995, Residual statics estimation for data from structurally
complex areas using prestack depth migration: M.Sc. thesis, Colorado
School of Mines. (In progress.)

Larner, K., and Tjan, T., 1995, Simultaneous statics and velocity
estimation for data from structurally complex areas.
(Appeared in 1995 Project Review, CWP-185.)


Trace header fields set: ns, dt, delrt, tracl, tracr, fldr, tracf
offset, sx, gx, trid, counit