Patent ID: 7768871

Claim:
A seismic processing method of the migration type, comprising the steps of: linearly combining downgoing seismic waves generated at a plurality of shotpoints by different seismic sources, and upgoing seismic waves recorded by a plurality of seismic sensors; notionally propagating the composite seismic waves as obtained in this way in order to obtain migrated downgoing and upgoing seismic waves for different depths; and determining at a plurality of depths at least one characteristic of the subsoil as a function of the upgoing and downgoing seismic waves propagated in this way; and the method further comprising the step of calculating the downgoing (respectively upgoing) composite waves by a linear combination of downgoing (respectively upgoing) waves in which said downgoing (respectively upgoing) waves are weighted by the coefficients of a spatial modulation matrix which is a function of the positions of the shotpoints.