共反射面元叠加的应用理论——从共反射点到共反射面元

英文篇名：AN APPLIED THEORY ON COMMON REFLECTION SURFACE STACK—FROM COMMON REFLECTION POINT TO COMMON REFLECTION SURFACE
中文刊名：地球物理学报
英文刊名：Chinese Journal of Geophysics
作者：王华忠 ; 杨锴 ; 马在田
英文作者：WANG Hua Zhong\ YANG Kai\ MA Zai Tian Laboratory of Marine Geology NDE ; Tongji University ; Shanghai 200092 ; China
中文关键词：地震勘探 ; 共反射点(CRP) ; 共反射面元(CRS) ; Normal波 ; Normal Incidence Point(NIP)波 ; 中心零炮检距射线 ; 傍轴近似
英文关键词：Seismic propecting ; Common Reflection Point (CRP) ; Common Reflection Surface(CRS) ; Normal wave ; Normal Incidence Point(NIP) wave ; Radius of curvature ; Central zero offset ray
出版日期：2004-01-17
机构：同济大学教育部海洋地质重点实验室,同济大学教育部海洋地质重点实验室,同济大学教育部海洋地质重点实验室上海200092 ,上海200092 ,上海200092
年：2004
期：01
出版单位：地球物理学报

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 .
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.

引文

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