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This dataset has been intensively used for testing multiple
attenuation techniques (The Leading Edge, January 1999). Figure
shows the velocity model that is used for the
migration ().
velgom
Figure 12 Velocity field for the
Gulf of Mexico 2-D line.
For this data set I did not separate primaries from multiples
as required by the theory. As an approximate solution, I decided
to mute everything above the first surface-related multiple
for the up-going wavefield. Therefore the down-going wavefield is made of
the complete shot and the up-going wavefield is made of the complete
shot minus the primaries above the first surface-related multiple
(Figure ).
gom_ud_mult500
Figure 13 Left: The source
function with primaries and multiples. Right: Same as the source
function but with a mute above the first surface-related multiple.
The migration results are displayed in Figure .
Figures a and b show the
migration results for primaries and multiples respectively.
The two migrations produce similar results.
Despite the approximations made, the multiple
migration gives a very accurate image of the salt body and of the
sediments.
gom_comp
Figure 14 (a) Migration of
the primaries. (b) Migration of the multiples. The two images
are comparable. The salt body is clearly visible in the multiple
migration result.
Next: A North Sea example
Up: Two 2-D field data
Previous: Two 2-D field data
Stanford Exploration Project
6/7/2002