【摘要】 共反射面元 (CRS)叠加是目前认为最好的生成零炮检距剖面的方式 .共反射面元意指地下某一反射点邻近的一个反射弧段 ,该弧段在时空域内的走时响应称为CRS叠加面 ,该叠加面可视为反射弧段上各共反射点(CRP)的时空域内走时响应的组合 .在一般的共反射点走时关系基础上 ,引入两种特征波———Normal波和NormalIncidencePoint波 ,就可以在傍轴近似假设下 ,将CRP走时关系推广到反射点邻近的各反射点 ,将这些反射点的CRP走时关系加以组合就得到了关于该反射点的共反射面元的走时关系 .考察从共反射点 (CRP)到共反射面元 (CRS)的过渡 ,这一过程提供了CRS叠加的应用理论基础 .更多还原

【Abstract】 Common Reflection Surface (CRS) stack is the best way at present to simulate zero offset section. It can adapt to weak laterally inhomogeneous media. Common Reflection Surface is a circle segment around an underground reflector. Its traveltime response in the time space domain, so called CRS stack surface, can be regarded as a combination of all Common Reflection Point (CRP) trajectores in the segment. Based on a general CRP trajectory expression, with two kinds of eigen wave——Normal wave and Normal incidence wave being introduced, the traveltime response of CRS can be given by extending CRP expression via considering that all rays are reflected on the segment around the reflector according to paraxial approximation. This paper provides the applied theoretical foundation for CRS stacking.更多还原