基于裂步DSR的最小二乘偏移方法  

The Study of Least-Squares Migration Method Based on Split-Step DSR

作　　者：黄建平[1] 薛志广 步长城[2] 李振春[1] 王常波[2] 高国超 曹晓莉 李国磊[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]胜利油田物探研究院,山东东营257022

出　　处：《吉林大学学报（地球科学版）》2014年第1期369-374,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41104069;41274124);国家"973"计划项目(2014CB239006);山东省自然科学基金项目(ZR2011DQ016);中央高校基本科研业务费专项基金项目(R1401005A)

摘　　要：为适应复杂构造和岩性油气藏勘探开发对地震处理精度的需求,一种源于反演思想的最小二乘偏移算法应运而生。基于最小二乘偏移基本理论,推导了互为共轭的正传播和反传播算子,实现了基于裂步DSR的最小二乘偏移算法。在算法优化的基础上,将算法分别应用于水平层状和Marmousi模型进行偏移试算,结果证实了LSM不仅适用于复杂地质构造成像,且经过多次迭代后的成像质量在局部区域要优于常规偏移方法,具体表现为:1)成像分辨率有一定提高;2)中深层能量得到有效补偿。In order to adapt for the exploration and development of complex structures and lithologic hydrocarbon reservoirs ,least-squares migration method applying inversion is proposed .In this paper , based on the basic theory of least-squares migration （LSM） ,we deduced the forward propagator and its adjoint of back propagator ,and then LSM based on split-step DSR was implemented .We tested this algorithm via four layers and SEG/EAGE Marmousi velocity model .The image results demonstrate that LSM has not only a high image resolution for the complex media ,in addition ,there will be a better image quality than conventional migration method after several iterations of conjugate gradient method for some local regions in the follow aspects ：1）the image resolution is highly improved ;2）A better imaging energy compensation for the deeper part of the model .

关 键 词：最小二乘偏移 裂步双均方根 共轭梯度 成像分辨率 

分 类 号：P631.4[天文地球—地质矿产勘探]