Applied Theory and Practice on Common Reflection Surface Stack

Abstract

AbstractCommon Reflection Surface (CRS) stack is the best way known to simulate a zero‐offset section. It can adapt to weak laterally inhomogeneous media. Common Reflection Surface (CRS) means a segment around an underground reflector. Its traveltime response in the time‐space domain can be regarded as a combination of associated Common Reflection Point (CRP) trajectories on the segment. After a general CRP trajectory expression is derived, with two kinds of eigen wave—Normal wave and Normal incidence point wave being introduced, the traveltime response of CRS can be given by extending CRP trajectories of one reflector to all reflectors in the segment around the reflector according to paraxial approximation. Inspecting this mathematical “transition” from CRP to CRS, this process provides the theoretical foundation for implementation of CRS stack.