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We run plane-wave migration in both Cartesian and tilted coordinates. We generate 200 plane-wave sources in total,
and the take-off angles at the surface range from to
. Since we do not run multiple
attenuation, the images are contaminated by the multiples.
Figure shows the velocity model of the left rugose salt body.
Figures
and
show the images.
Figure
is obtained by downward continuation,
and Figure
is obtained by plane-wave migration in tilted coordinates.
In Figure
, the image of the
top of the salt is not continuous. Some parts of the top are almost vertical and are lost in the downward
continuation. This image captures only the bottom of the two canyons, and loses their flanks.
Downward continuation also loses the steep salt flanks in the multi-valued area. These losses make picking
the salt difficult. In contrast, plane-wave migration in tilted coordinates images the salt body
very well and makes salt picking easier.
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Figure shows the velocity model of the right salt body.
Figures
and
show the images.
Figure
is obtained by downward continuation, and
Figure
is obtained by plane-wave migration in tilted coordinates. Downward continuation loses the flanks
of the top part of the salt. Due to overturned waves, downward continuation also loses the right leg and the center
part of the left leg. In contrast, plane-wave migration images most parts of the salt flanks and the two legs.
Hence, it is much easier to interpret the salt body from Figure
.