The goal for seismic prediction is to use the surface-recorded seismic waveforms and the wells to make subsurface prediction away from the wells. Even though prestack depth migration has made significant advances, it addresses large traveltime distortions. Thin beds in the overburden cannot be resolved into velocity and thickness. But their impact is significant to the stacked waveform, angle stacks and AVO gradient. We will also include discussion of overestimating anisotropy due to overburden error.


Prestack time migration is routine and has become almost a commodity. We routinely receive prestack common-offset migrated gathers and use them for prospect evaluation.

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