Welcome to Techco Geophysical Services Ltd.
Developing seismic processing software
Main Software Products - FINITE DIFFERENCE MIGRATION
WMIG
is a post stack 2D and 3D migration process. WMIG is a simple to use.
It is a batch process which has been interfaced to some of the well-known
comercial seismic processing systems. There are compile-time porting
flags for most of the major UNIX workstations.
- 2D and 3D
Stacked data can be input in any order, and migrated. 3D data may
have different In-Line & Cross-Line bin intervals. To date,
surveys of up to 1.5 million traces have been migrated
successfully, but there is no reason why this should not be
increased given sufficient capacity.
Four way splitting is used for circular symetry of the 3D impulse response.
- Choice of different Algorithms
Run time coding includes a choice of implicit ( 15 degree
45 degree or 65 degree algorithms {Claerbout, Lee & Suh}) or
explicit continuation. In the near future a new option will
be shipped for phase shift {Gazdag} + correction
migration, where the correction operators are explicit filters
which convert the well-known Phase Shift operator to work with
space and time varying velocities.
- Multi Threaded
WMIG may be compiled to use Solaris, POSIX or SGI threading calls.
The user codes the number of threads which he wants to spawn and
these all migrate the data simultaneously into the same image
buffer in memory. Excluding data loading & output, the speed is
very close to linear up to the maximum number of CPUs tested, which
is currently a 12 CPU Sparc 4000.
Using multiple threads avoids the need to split the migration into
several overlapping sections, and since all of the threads share
the same image buffer, there is little extra memory requirement.
- Allows for Surface Topography
WMIG uses a Zero Velocity layer to apply the dispersion term
only from the earth's surface. Provided that datum is at least as
high as as the surface throughout the survey, migration can be
performed from any topography.
Last modified: Wed May 31 09:58:27 MDT 2017