最小二乘逆时偏移在近地表高精度成像中的应用  

Least square reverse time migration in high resolution imaging of near surface

作　　者：黄建平[1] 曹晓莉 李振春[1] 孙陨松 李闯 高国超 

机构地区：[1]中国石油大学(华东)地球科学与技术学院地球物理系,山东青岛266555

出　　处：《石油地球物理勘探》2014年第1期107-112,303,共6页Oil Geophysical Prospecting

基　　金：国家"973"项目(2011CB202402);国家自然科学基金项目(41104069;41274124);山东省自然科学基金项目(ZR2011DQ016)联合资助

摘　　要：近地表高精度成像方法一直是地震数字处理方法研究的热点。逆时偏移(RTM)成像方法基于双程波动方程,被认为是解决复杂构造、尤其是高陡构造成像的较好方法,然而逆时偏移方法在浅部成像过程中存在较强的低频噪声,在一定程度上影响对近地表构造的高精度成像。本文在实现最小二乘逆时偏移(LSRTM)算法的基础上,通过RTM及LSRTM算法的计算对比指出,对于近地表复杂构造成像,LSRTM相对于RTM算法在主要构造恢复及能量保幅性方面具有一定优势。Near surface high resolution imaging in seismic data processing is attracting great attention. Reverse time migration(RTM)from two way wave equation is considered a good way to image the steep structure.However low frequency noise generated during the RTM imaging process is relatively high,which affects high resolution imaging of near surface.To challenge this problem,we propose in this paper a least square reverse time migration(LSRTM)method.Test results on a complex near surface velocity model indicate that LSRTM is much better than RTM for structure high resolution imaging and energy preservation.

关 键 词：近地表 逆时偏移 高陡构造 低频噪声 最小二乘逆时偏移 

分 类 号：P631[天文地球—地质矿产勘探]