2-D CRS Stack : one-step versus multi-step strategies

Abstract

The Common Reflection Surface Stack (CRS) method simulates zero-offset (ZO) sections by means of summing the amplitudes of seismic events in the multicoverage data by using a stacking surface. For 2-D media, this stacking surface depends on three kinematics attributes of two hypothetical waves at the point of emergency of the normal incidence central ray, namely, the emergency angle of the normal ray, the radius of curvature of the Normal Incidence Point Wave and the radius of curvature of the Normal Wave. The optimization problem in the CRS method consists in determining, from the multicoverage seismic data, the three CRS parameters associated to each sample point of ZO section to be simulated. The simultaneous determination of these parameters can be made by means of multidimensional global search process (or global optimization), using as objective function some coherence criterion. In this work we present a new one-step strategy (i.e. the three CRS parameters are obtained simultaneously) to implement the 2-D CRS stack method. To test the one-step CRS strategy, we apply it to the Marmousi synthetic dataset and the results show a better continuity of the seismic events in comparison with the results of the multi-step CRS stacking strategy.