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Migration: Time or
Depth? Kirchhoff or Wave Equation?
Presented by Jianhua Pan
March 11th or March 13th, 2008
11:55 to 1 pm (lunch provided)
Suite 2600, 111 - 5th Ave
SW
East Petro-Canada Tower
Limited seating,
click here to
RSVP
This
is the second in a series of lunch & learn seminars, see
the sidebar for information on the other topics.
Migration is an important
step in the seismic data processing workflow. Over the
last couple of decades, many techniques have been
developed for both time and depth migration. In general,
there are two families of migration methods, Kirchhoff
and wave equation.
There are many differences
between time migration and depth migration. The most
obvious difference is the output display of the migrated
traces. Besides, time migration has a single output that
is the image. The imaging velocity (rms velocity) it
produces does not have any physical meaning. However,
depth migration generates a dual output, i.e. the image
as well as the interval velocity. Part of this talk will
show differences between time and depth migrations from
the point of view of the algorithms used and also in
terms of the application on real seismic data.
With regards to migration
methods, the Kirchhoff method is still very popular in
our industry, though the wave equation technique is
widely accepted and applied. Since both methods have
their own advantages and disadvantages, it may not be
advisable to comment on which is better. The Kirchhoff
method is accepted as the main method for time migration
as it affords the convenience of being able to directly
use rms velocity. For depth migration, the Kirchhoff
method is used for velocity analysis and the wave
equation method is used for final migration. There are
some obvious questions that come to mind, the foremost
one being: can the wave equation method be applied for
time migration with rms velocity and for velocity
analysis in depth migration? This talk will not only
answer this question but also show some basic concepts
as well as differences between Kirchhoff and wave
equation methods. This presentation will help you decide
which particular migration needs to be adopted for your
seismic data.
To learn more, attend the
lunch & learn session on March 11th or 13th.
Click here to RSVP.
This course is
available as a free in-house seminar. For more
information contact Florence Janzen, 781-1437 or email
fjanzen@arcis.com. |
