A METHOD OF SEISMIC PROCESSING OF THE TYPE COMPRISING DEPTH MIGRATION BEFORE ADDITION

摘要

A seismic processing method of the migration type, comprising the steps of : ~ linearly combining downgoing waves generated at a plurality of shotpoints, and also upgoing waves recorded by a plurality of seismic sensors; ~ notionally propagating the composite waves as obtained in this way in order to obtain migrated downgoing and upgoing 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 waves propagated in this way; the downgoing (resp. upgoing) composite waves being calculated by a linear combination of downgoing (resp. upgoing) waves in which said downgoing (resp. upgoing) waves are weighted by the coefficients of a spatial modulation matrix which is a function of the positions of the shotpoints.