AVO (amplitude variation with offset) analysis was formerly introduced by Bill Ostrander (in a presentation at the 1982 SEG Annual Meeting), for confirmation of bright spots and other anomalous reflections seen on RAP (relative-amplitude preserved) sections. Since then, we have come a long way in extracting more information from prestack seismic amplitudes. A few crucial points that have emerged in all these analyses are: (1) an understanding of the assumptions underlying the theory being put to use and how well these assumptions are met in practice, (2) the realization that AVO reliability strongly depends on the quality of the processing, and (3) awareness of the importance that correct interpretation techniques be employed to extract meaningful information from the AVO attributes.

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