Although amplitude versus angle (AVA) analysis is currently performed on unmigrated prestack data, there is increasing evidence that more reliable and better resolved AVA attributes can be obtained by inversion after prestack migration, either in time (Mosher et al., 1996) or in depth (Beydoun et al., 1993)—even when considering flat structures. In principle at least, the use of prestack depth migration before inversion appears a better option because it involves a less approximate description of wave propagation and provides better results in terms of location, resolution, and accuracy of AVA targets.

For successful AVA inversion after migration, amplitude preservation naturally...

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