oa CRS Workflow for Enhanced 3D Seismic Salt Imaging and Model Building

A case study for 3D seismic land data from Mexico uses high-resolution CRS attribute volumes for improving the imaging and model buildung in salt geology. Initial CRS time processing provides both, an initial outline of the salt body, and general information for constructing the depth model. On one hand, sediment and salt areas are more clearly separated by a conspicuous drop of reflection continuity in the CRS time images. On the other hand, the CRS attributes contain abundant information for constructing a reliable velocity depth model by CRS tomography. The smooth CRS depth model is well suited for initial poststack and prestack depth migration (PostSDM and PreSDM). PostSDM transfers the good structural resolution and salt body delineation of the CRS time domain images to depth, thus supporting the initial salt body definition in depth. Furthermore, a CRS-based noise suppression and regularisation of the prestack data improves the iterative sequence of PreSDM imaging and model refinement. The CRS depth processing approach finally leads to a 3D PreSDM volume with a strongly increased resolution and signal-to-noise ratio.