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Wave Equation Summation
(WESUM) for Prestack time and
depth migration
Presented by Jianhua Pan
October 17th or 19th, 2006
11:45 to 1 pm (lunch provided)
Suite 2600, 111 - 5th Ave SW, East Petro-Canada Tower
Limited seating, click here to
RSVP
This
is the third in a series of lunch & learn seminars, see
the sidebar for information on the other topics.
Wave Equation Prestack Depth Migration (WEM)
has been used in the seismic industry for several years. Its ability to handle
multiple arrivals from a surface position to subsurface point provides us with
higher quality images than Kirchhoff migration. However, apart from computational
efficiency, WEM lacks some other advantages of Kirchhoff migration such as the
flexibility and the option to output surface-offset-indexed common image gathers
(CIGs) which can be used for offset-domain migration velocity analysis and AVO analysis.
We have developed a wave-field extrapolation approach which is able to handle multiple
arrivals and has both the flexibility and the ability to output surface-offset-indexed CIGs.
We call this approach Wave Equation Summation (WESUM). In most cases, WESUM generates better
images than shot profile migration.
Moreover, WESUM can be used for running prestack time migration with rms velocity as opposed
to running wave equation migration using interval velocity. Just as in Kirchhoff prestack
time migration image at one point is only related to the rms velocity at that point, it is
possible to use WESUM to perform prestack time migration velocity analysis. The image
quality with WESUM, of course, is better than the one from Kirchhoff migration.
To learn more, attend the
lunch & learn session on October 17 or October 19.
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. |
