基于多参数速度模型的转换波叠前时间偏移技术

英文篇名：The converted wave pre-stack time migration technique based on multiparameter velocity model
中文刊名：石油地球物理勘探
英文刊名：Oil Geophysical Prospecting
作者：毕丽飞
英文作者：Bi Li-fei1 ; 2.1.China University of Geosciences (Wuhan) ; Wuhan City ; Hubei Province ; 430074 ; China2.Geophysical Research Institute of Shengli Oil-field ; Sinopec ; Dongying City ; Shandong Province ; 257001 ; China
中文关键词：转换波 ; 渐近转换点 ; 多参数速度模型 ; 叠前时间偏移
英文关键词：converted wave ; progressive conversion point ; multiparameter velocity model ; pre-stack time migration
出版日期：2010-06-15
机构：中国地质大学(武汉);中国石化胜利油田物探院;
年：2010
期：03
出版单位：石油地球物理勘探

摘要

转换波成像困难的关键在于转换波的共转换点位置难以求准。本文在抽取渐近转换点(ACP)的基础上,采用基于多参数速度模型的Kirchhoff偏移算法实现叠前偏移成像,避开抽取共转换点难的问题,可以从常规速度分析方法中求取与转换波有关的速度参数。该方法很好地解决了转换波不对称性射线路径及强各向异性等带来的不利影响,实现了实际地震道转换波的不同反射层段在空间上的归位。
The difficulty in precisely estimating location of the common transform point for converted wave results in difficulty for the converted wave imaging.Based on the extraction of the progressive conversion point,the Kirchhoff migration algrithm based on the multiparameter velocity model was conducted to realize pre-stack time migration,by avoiding difficulty in extraction of common transform point,the velocity parameters which are related to converted wave can be extracted from conventional velocity analysis method.With the method the adverse effects which were caused by converted wave asymmetry ray path and strong anisotropy were removed,and the different reflection segments in space for field seismic trace converted wave were migrated to its original location in the space.

引文

[1]Helbig Kand Thomsen L.75-plus years of anisotropy in exploration and reservoir seismics:Ahistorical re-viewof concepts and methods.Geophysics,2005,70,9ND～23ND
    [2]杜启振,杨慧珠.方位各向异性介质的裂缝预测方法研究.中国石油大学学报,2003,27(4):32～36
    [3]Li X Yand YuanJ.Converted-wave moveout andcon-version-point equations in layered VTI media:theory and application.Journal of Applied Geophysics,2003,54:297～318
    [4]毕丽飞,李振春,王延光等.转换波处理中共转换点的定位.勘探地球物理进展,2005,28(5):353～356
    [5]张永刚等.目前多分量地震勘探中的几个关键问题.地球物理学报,2004,47(1):151～155
    [6]Dai H and Li X.Anisotropic migration and model building for4-C seismic data:A case study from Al-ba.SEG Technical Program Expanded Abstracts,2001,20:795～798
    [7]刘文卿等.三维转换波叠前时间偏移方法研究与应用.天然气工业,2007,27(增刊A):189～191
    [8]张丽艳,刘洋.转换波叠前偏移方法综述.地球物理学进展,2005,20(4):1134～1139
    [9]Dai H,Li X Yand Conway P.3D pre-stack Kirchhoff ti me migration of PS-waves and migration velocity model building.SEG Technical Program Expanded Abstracts,2004,23:1115～1118
    [10]黄中玉,朱海龙.转换波叠前偏移技术新进展.勘探地球物理进展,2003,26(3):167～171
    [11]谢飞,常旭,刘伊克.火山地震屏蔽层的转换波叠前时间偏移成像.地球物理学报,2008,51(6):1899～1908
    [12]裴正林.三维各向异性介质中弹性波方程交错网格高阶有限差分法数值模拟.中国石油大学学报,2004,28(5):23～29