f Shot gathers amplitude and frequency processing and fast prestack depth migration. Application to ECORS deep reflection seismic data

Stacked sections of ECORS deep reflection seismic profiles are characterized by: - an important variability in the lateral continuity of the reflections, - the presence of transparent zones, - the occurrence of highly dipping reflections, - the often strong and complex reflectivity of the lower crost. The CDP stacking procedure may not be well adapted because: - the quality of the shot gathers is quite variable, - the reflection events are assumed to have continuous hyperbolic moveout, - the lateral smearing of the CDP on dipping reflectors is large since the spreads used are long, - normal moveout is a dip selective procedure.