Method and system for determining source signatures after source ghost removal

摘要

Seismic data are acquired using a seismic source comprising a plurality of seismic sub-sources disposed in a body of water at a plurality of depths and activated with different time delays. Far-field signatures are determined for the plurality of seismic sub-sources at each of the plurality of depths. A composite ghost-free far-field signature of the seismic source is determined from the far-field signatures for the plurality of seismic sub-sources at each of the plurality of depths and different time delays. A source response is removed from the seismic data using the far-field signatures of the seismic source (20 Obtain seismic data acquired using a seismic source comprising a plurality of seismic sub-sources disposed in body of water at plurality of depths and activated with different time delays (21 Determine far-field signatures for seismic sub-sources at each of plurality of depths 1 r-22 Determine composite ghost-free far-field signature of seismic source from far-field signatures for seismic sub-sources at each of plurality of depths and different time delays (R23 Remove source response from seismic data using composite ghost-free far-field signature of seismic source Determine notional source signatures for seismic sub-sources used to record seismic data at each of plurality of depths Ir 31 Determine far-field signature from weighted summation of notional source signatures at each of plurality of depths