共中心点道集的平面波法叠前时间偏移  

CMP gather prestack time migration by plane wave approach

作　　者：王棣[1] 王华忠[2] 马在田[2] 

机构地区：[1]山东省东营市北一路胜利油田物探研究院特殊处理室,257022 [2]同济大学海洋与地球科学学院

出　　处：《石油地球物理勘探》2007年第5期506-509,共4页Oil Geophysical Prospecting

摘　　要：本文提出了一种适用于速度弱横向变化介质中基于平面波分解的波动方程叠前时间偏移方法。通过对共中心点道集地震数据的平面波分解,得到适用于双平方根波场外推方程的共ph平面波参数道集。对共中心点道集进行炮检距平面波分解时,不需要进行通常意义下的τ-p变换计算,对分解后的每个共ph道集数据做偏移时则采用既实现简单方便、保幅性能较好,又不失计算效率的相移算法。偏移后可以抽取ph射线参数共成像点道集进行速度分析和AVO岩性分析。The paper presented an approach of plane wave decomposition-based wave-equation prestack time migration suitable for the medium of lateralweak velocity variation. By plane wave decomposition of seismic data on CMP gather, we get the gather of common ph plane wave parameter suitable for double square root wavefield extrapolation e-quation. The ordinary τ-p transform computation is not needed when offset plane wave decomposition on the CMP gather is carried out, the phase-shift method characterized by simple and convenient implement, better amplitude-conserving property and without losing computational efficiency is used for migration of each post-decomposition common ph gather data. After migration, the velocity and AVO lithologic analyses can be carried out on sorted ph ray parameter common image point gather.

关 键 词：叠前时间偏移 平面波分解 共中心点道集 射线参数 共成像点道集 

分 类 号：P618.13[天文地球—矿床学]