对共反射面叠加的进一步探讨

共反射面元（CRS）叠加考虑了反射层的局部特征和第一菲涅耳带内的全部反射，更充分挖掘了多次覆盖数据的潜力.但在地下介质复杂并存在倾斜层时存在反射点分散的情况，从而影响了CRS叠加效果.本文从射线理论出发，在考虑反射层局部特征的情况下，推导了水平地表和起伏地表情况下计算真实反射点分散程度的公式，最终将反射点分散程度定量表达出来.通过对反射点分散程度的控制，从CRS道集中抽取出共反射点（CRP）道集，在CRP道集中而不是在CRS道集中实现叠加，其效果应比传统的CRS叠加效果要好.利用水平地表和起伏地表的模型验证了本文所推导的公式的正确性和有效性.该公式在实际资料处理中的运用尚待进一步研究.

Further study on common reflection surface stack

Common reflection surface(CRS) stack concerns the local feature of the reflector and all reflection response within the first Fresnel zone,so it fully use the potential of the multiple coverage seismic data.Because of the dispersion of the reflection points on the dipping layer,the quality of CRS stack is restricted.Based on the ray theory,concerning the local feature of the reflector,the formula for calculating real reflection point dispersion is obtained in the circumstance of both plane top surface and complex top surface.Using the formula for calculating real reflection point dispersion,common reflection point(CRP) gather can sorted from CRS gather and performing stack in CRP gather but not CRS gather is possible and the latter result should be better than the former.At last,the correctness and effectiveness of the formula was tested using models with plane surface and complex surface.The application of the formula in real seismic data needs further research.