Abstract
Imaging seismic data requires detailed knowledge of the propagation velocity of compressional waves in the subsurface. Interval velocity can be estimated from the prestack data transformed using beam stacks when conventional method fail; that is, in presence of structure in the geology and lateral velocity variations. In a previous SEG abstract (Biondi, 1988) I presented a tomographic method for estimating interval velocity from beam-stacked data. In this abstract I show the results of applying the proposed algorithm to the estimation of a low-velocity anomaly. Depth migration of the data with the estimated velocity removes the time pull-down caused by the anomaly. The velocity anomaly is estimated with an automatic procedure that does not require a preliminary picking of the data data because it directly maximizes the beam stacks’ energy at the traveltimes and surface locations predicted by ray tracing.
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