Abstract

Velocity dispersion is not usually a problem in surface seismic data processing, as the seismic bandwidth is relatively narrow, and thus for most Q values, dispersive effects are not noticeable. However, for highly absorptive bodies, such as the overpressured free gas accumulations associated with gas hydrates, dispersive effects can be seen. In this work I analyse one such data set from the offshore North East coast of India. I demonstrate that the effect is measurable, and that compensating for it in either data processing or migration, can improve the wavelet character, as well as delivering an estimate of the Q values in the associated geobody.