oa Kirchhoff-type Pre-stack Time Migration Using the CRS Stacking Operator

The Common Reflection Surface (CRS) stack method was developed to simulate ZO (zero-offset) staked sections from multi-coverage datasets. However, stacked data plus post-stack migration may loss quality in structural complex geological environments. In order to obtain high-quality images, in this work is presented an application of the CRS stacking operator for pre-stack time migration (PSTM). This new method called combines the classical Kirchhoff migration with the CRS operator, that is, for each sample point to be migrated with the Kirchhoff migration operator a beam-type stacking is performed of the locally coherent events using the CRS stacking operator. To test the reliability the CRS-beam PSTM is applied to expressively crooked seismic data. A comparison with the result of the Kirchhoff PSTM reveals that this new method produces improved image.