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Figure shows the migration result. Figure
shows three angle gathers. Observe the residual moveout in these
angle gathers. This indicates errors in the velocity model.
ppmiga
Figure 1 PP migration result with
the original P-velocity model
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ppmigb
Figure 2 Three angle domain common
image gathers for the migration result of Figure .
They corresponds, from left to right, to a lateral
position of 2500m, 4500m and 6500m. Observe the residual curvature.
I perform Stolt residual migration () over
this migration result. There is not a single value of
that fixes the whole section. Figure
shows the same three angle domain common image gathers,
as in Figure . Moreover, each angle domain common
image gather corresponds to a different value of , from
left to right, and .
Note how different events correct better for different
values.
ppsrm2
Figure 3 Angle domain common image gathers
after Stolt residual migration. They corresponds to the same
position as the angle gathers in Figure . Moreover,
from left to right they also correspond to
and
By updating the velocity model with different values at
different depths and lateral positions, I perform
a new migration. Figure shows this final
migration result. Figure shows again the
same different angle domain common image gathers for the migration
result of Figure .
finalpp
Figure 4 Migration result after updating
the P velocity model with different values of at
different depth and lateral locations.
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finalcag
Figure 5 Angle domain common image gathers
for the migration result of Figure at the same
position of Figure .
Next: PS results
Up: Real data results
Previous: Real data results
Stanford Exploration Project
11/11/2002