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We applied the same method to the Marmousi model. Figure 9
shows a Kirchhoff migrated stack of the Marmousi data.
The right panel of Figure 10 shows the offset-domain CIG
taken from the surface location at 6336 meters. The left panel shows
angle-domain CIG for the same surface location obtained by the wave-equation
migration method described earlier. Although the angle-domain panel
has more artifacts, it has better quality results. The angle-domain CIG
contains higher frequencies. The reflectors at depths 1800 and 2500 meters
are stronger and more continuous. The artifacts are caused by difficulties
in the sampling and stack out of the image (Figure 11).
stack.marm
Figure 9 Kirchhoff migrated stack
marm.gathers
Figure 10 Left: angle-domain CIG. Right:
offset-domain CIG. Both are from surface location 6336 meters.
stack.WE
Figure 11 Wave-equation migrated stack
Next: Conclusions
Up: Prucha, et al.: Angle-domain
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Stanford Exploration Project
4/20/1999