P-SV波的共转换点道集抽取  

CCP GATHERING FOR P-SV CONVERTED WAVES

作　　者：张耀辉 

机构地区：[1]美国塔尔萨大学地球科学系

出　　处：《石油物探》1992年第3期87-101,共15页Geophysical Prospecting For Petroleum

摘　　要：P-SV转换波的叠加必须知道真正的共反射点。 这个共反射点就是所谓的P-SV波共转换点。由于P-SV转换波对线的不对称性,它的叠加比纵波的CDP叠加要难得多。如果我们已知介质中横波与纵波速度的比值、水平界面的埋藏深度和炮检距,炮点到共转换点的水平距离就可以通过解一个四次方程求出。本文将讨论如何确定P-SV转换波的转换点并分析P-SV波在地下界面的反射点和地面接收点的分布,从而提出动态抽取共转换点道集并实现CCP叠加的方法。The stacking for P-SV Converted waves requires to determine the actual common reflecting points, namely Common Comversion Points (CCP). The CCP stacking for converted waves is much more complicated than the CDP stacking for P-waves due to the asymmetric ray paths. Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation. In this paper, we will show how the converting points for P-SV waves on subsurface interfaces and the distribution of the convening points/ receiving points on the surface are determined so as to appropriately categorize the data for CCP gathering. Also included in the paper there are some processing examples for synthetic data, through which the validity of the argument in the paper is demonstrated.

关 键 词：P-SV波 共转换点 道集 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]