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![]() | Imaging in shot-geophone space | ![]() |
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Jon Claerbout
Till now, we have limited our data processing to midpoint-offset space.
We have not analyzed reflection data directly in shot-geophone space.
In practice this is often satisfactory.
Sometimes it is not.
The principal factor that drives us away from -space into
-space
is lateral velocity variation
.
In this chapter,
we will see how migration can be performed
in the presence of
by going to
-space.
Unfortunately, this chapter has no prescription for finding ,
although we will see how the problem manifests itself
even in apparently stratified regions.
We will also see why, in practice, amplitudes are dangerous.