We applied 3-D Kirchhoff prestack depth migration to homogeneous velocity models.
We compared the individual contributions to the final image and we observed asymmetry in migration is caused by triclinic anisotropy that is asymmetric.
We observed mispositioning, distortion and defocusing of the migrated interface caused by inaccurate velocity models used for migration.
Analogous position errors may be more difficult to identify in the images of real structures.
Individual common-shot images of an interface may simultaneously be positioned correctly and rotated erroneously. When stacking the common-shot images, this rotation may result in erasing some parts of the interface due to destructive interference.
We may also expect similar effects of the incorrect heterogeneities in the velocity model and synergy of the incorrect anisotropy and incorrect heterogeneities.
The research has been supported by