Implementing the CRS beam prestack depth migration with double-smearing operator within the unified Kichhoff imaging theory

摘要

The unified Kirchhoff imaging theory provides an essential theoretical foundation for understanding any Kirchhoff-type imaging methods. The local kinematic attributes are important information regarding a local coherently event in seismic dataset. We develop a double-smearing operator based common-reflection-surface (CRS) beam prestack depth migration (PSDM) based on the unified Kirchhoff imaging theory and the local kinematic attributes. Differing from the previous works based on the Hugens-curve-stacking scheme, the double-smearing operator employed in this paper is derived on the basis of the isochrones-smearing scheme defined in the unified Kirchhoff imaging theory. It provides a parallel approach to implement the CRS beam PSDM. The synthetic and real data examples demonstrate the effectiveness and robustness of the double-smearing CRS beam PSDM operator.