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I now proceed to the final imaging steps of migrating
every shot record and summing them. Figures a and
b show the final migration result for both primaries and
multiples. The two final images are quite similar although the migration
of the primaries with the impulsive source is crispier and less
noisy than with multiples.
Nevertheless the migration of multiples yields an accurate
image of the earth. After closer inspection, it seems that
the flanks of the canyon in the middle above the salt dome
is better defined with the multiples.
The illumination maps displayed in Figures c
and d are almost identical after summation of all shot
contributions. This comes from the acquisition geometry at
the two ends of the survey.
This first result is rather encouraging and shows that multiples
can be used to image the earth.
compmig
Figure 7 Final migration
results and illumination maps. (a) Migration of the primaries.
(b) Migration of the multiples. (c) An illumination map for
all the impulsive sources. (d) An illumination map for all the areal
sources.
Next: Other migration results with
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Stanford Exploration Project
6/7/2002