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In the first part of our example, we have concentrated on improving the
focusing of the image. We achieved this goal by
using Stolt residual migration in the prestack domain
Sava (1999); Stolt (1996). Of course, Stolt residual migration
is not the only possibility, another alternative being velocity
continuation Fomel (1997).
Figure 7 shows the image we obtained with a starting
velocity model, while Figure 8 displays the
image we obtained by applying residual migration to the
original. Both images have been created with the same level of
clipping. The second image is clearly better focused.
We can take the difference between the images in
Figures 7 and 8 to be the
perturbation in image (), and use it to invert for the
slowness model that generated the improvement in focusing.
Next: Inversion
Up: An example of inversion
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Stanford Exploration Project
6/1/1999