Solving The Conflicting Dips Problem In Complex Media By Considering All Possible Dips In Crs Method

Abstract

Abstract In the existence of conflicting dips, where the seismic events are bent, faulted, or pulled up by the salt dome or anticlines or even intersect another structural event, some parts of the events may not be imaged well in stacked section and may produce uncertainty in the final migrated section for interpretation. A modified version of the CRS stack, the common diffraction surface (CDS) stack, is a method that could solve the problem of conflicting dips that may happen frequently in complex and semi-complex structures. This strategy has some advantages that improve the continuity of reflection events as well as diffractions in the presence of conflicting dip situations. To investigate whether it could solve the seismic imaging problem in such media, we processed the Sigsbee 2A synthetic data and a real seismic data set with the new method. Finally, the stacked result of Sigsbee 2A and the results of the poststack depth migration of the real data also proved that the continuity of the events is fully preserved and there are no gaps in the diffraction events, even where they intersect other events. This method could resolve some of the ambiguities of imaging in complex structures. Introduction Working in complex and semi-complex structures requires new processing's methods to solve the problems of imaging in those situations. In those geological conditions, some problems like as defining the boundary of salt diapers or mud volcanoes, defining the location of faults, folding systems and unconformities, identify the reflection events below that structures and the problem of conflicting dips, are difficult to handle. The newly introduced method of common reflection surface (CRS) stack (Hubral, 1999) and the later method that was a modification of CRS stack under the name of common diffraction surface (CDS) stack (Soleimani, et. al., 2009b) beside the technique of prestack depth migration (PSDM) could be used in such situations. To solve the problem of imaging in this situation, Sigsbee 2A synthetic data and a real seismic data set were selected for application of the CMP stack method, defining the problems in imaging and solve the problems by applying the CDS stack method to them. The seismic data was selected from a sedimentary basin in north east of Iran, Gorgan.