CONCLUSIONS

We implemented a Hale-McClellan type migration algorithm for imaging 3-D post-stack data, with an option to vary the type of McClellan filter used in the migration. The migration does a good job of imaging the salt boundary and the faults by collapsing the diffractions caused by the salt sediment boundaries. Comparison of corresponding depth slices from data migrated using different McClellan transformation filters does not show large differences. The difference becomes clear, however, in a movie made of the depth slice alternating between the two McClellan filters. At this point, we have not been able to see the perceptible difference that we saw in the impulse response obtained using the rotated and original transformation filters, the results of which appear in our last report (SEP 77). The lack of visible differences is most likely caused by the limited dip and frequency range in the dataset. The other reasons can be an inaccurate velocity model and possibly insufficient migration aperture for imaging steep dips due to the data size. In the future we would like to test our migration algorithm on a dataset with a larger aperture and with more obvious steep dips.