Abstract：The common reflection surface (CRS) stack is an approach acquiring zero-offset section, which is unrelated to macro velocity model. The method uses three parameters of seismic wave field attributes: the emerged angle α of zero-offset ray emerging to surface, wavefront curvature radiuses of Normal wave emerging to surface and Normal Incidence Point wave to describe relationship between reflector and travel time. The CRS stack formula is deduced by second order Tailor expansion of CRS hyperbolic time-distance relationship. Because the stack considers different geometry of underground reflectors and is stack within the Fresnel zone, the method more approaches to real underground geologic situation. The model test and processing of practical seismic data showed that application of the approach not only greatly improved the S/N ratio and continuity of seismic data, but also can acquire three parameters of seismic wavefront attributes, benefit to improve the precisions of seismic velocity inversion and computed residual statics as well as the effect of AVO analysis.
