2-D and 3-D Time
and Depth Migration
In conjunction with
Lynx Information Systems, Oakwood Computing have developed a comprehensive
suite of 2-D and 3-D time and depth post-stack migration algorithms
which runs using completely portable, scalable heterogeneous parallel
algorithms, which can be implemented on networked Pentium machines for
example.
These services combine an innovative velocity ray-tube migration with
sophisticated seismic amplitude finite-difference migration algorithms
dispensing with the coarse treatment of velocity in many migration projects.
Velocity migration
- Input stacking
velocities are independently migrated using sophisticated wavefront-curvature
based algorithms into the appropriate output migration domain, prior
to their use in migration. Innovative extensions to wavefront-curvature
methods allow DMO-corrected input stacking velocities to be handled
correctly and independent information on interval velocity to be accommodated
iteratively.
- The result is
a consistently pre-migrated velocity model directly from unmigrated
velocity analyses, fully consistent with either depth or time migration
as appropriate, rendering migration velocity analysis unnecessary.
- Estimates of
velocity heterogeneity are provided.
Seismic amplitude
migration
- A suite of state
of the art finite-difference algorithms is used allowing trade-offs
to be made between dispersion and organisation of background noise.
Absorbing boundaries effectively remove side-pollution. Input can
either be stacked or already time-migrated data, which is diffracted
first.
- Surprisingly
small amounts of lateral heterogeneity can degrade the quality of
the image in conventional finite-difference time migration. Here,
significant lateral heterogeneity is handled correctly by a full finite-difference
solution in the migrated time domain for convenience of interpretation.
This improves the image quality whilst simultaneously positioning
events correctly, unlike conventional finite-difference time migration.
- Depth conversion
free of any migration effects can then be achieved by simple vertical
stretching, using the migrated velocity model.
Options
- 2-D or 3-D Stacking or DMO velocity field or velocity boxes <->
time or depth migration consistent velocity field using wavefront-curvature,
followed by ...
- 2-D or 3-D stack -> time or depth migration.
- 2-D or 3-D time migration to time or depth migration with different
velocities.
For more details, contact
us.
Lynx information Systems can be contacted here.
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