Effective CRS Workflow for Prestack Data Regridding, Regularization, and Depth Imaging

The common-reflection-surface (CRS) technique provides an effective workflow for seismic data preparation and imaging in large areas of regional studies. In a case study from the North Sea, the multi-parameter stacking technique is used to combine and homogenize vintage seismic data in time domain, and to accelerate the model building cycle in depth imaging. CRS time processing may directly start from input data acquired at diverse natural binning grids, and provide the regularisation and interpolation to a uniform output grid in one step. The regular CRS gathers show an almost complete CMP-offset coverage and a high signal to-noise ratio, and thus enhance the resolution of prestack migration in time and depth. Depth model building departs from the CRS attributes which provide the initial model via CRS tomography, and benefits in the model update by residual moveout analysis from the enhanced signal-to-noise ratio in the prestack data.