基于裂步DSR的最小二乘偏移方法

吉林大学学报(地球科学版)

基于裂步DSR的最小二乘偏移方法

黄建平¹，薛志广¹，步长城²，李振春¹，王常波²，高国超¹，曹晓莉¹，李国磊²

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

收稿日期:2013-06-30 出版日期:2014-01-26 发布日期:2014-01-26
作者简介:黄建平(1982-)，男，副教授，博士，主要从事地震波正演及偏移成像工作，E-mail:jphuang@mail.ustc.edu.cn
基金资助:
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）

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

Huang Jianping¹，Xue Zhiguang¹，Bu Changcheng²，Li Zhenchun¹，Wang Changbo², Gao Guochao¹，Cao Xiaoli¹， Li Guolei²

1.School of Geosciences，China University of Petroleum，Qingdao266580，Shandong, China;
2.Shengli Geophysical Research Institute, SINOPEC，Dongying257022, Shandong, China

Received:2013-06-30 Online:2014-01-26 Published:2014-01-26

摘要/Abstract

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。

关键词: 最小二乘偏移, 裂步双均方根, 共轭梯度, 成像分辨率

Abstract:

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.

Key words: least-squares migration, split-step DSR, conjugate gradient, imaging resolution

中图分类号:

P631.4

黄建平，薛志广，步长城，李振春，王常波，高国超，曹晓莉，李国磊. 基于裂步DSR的最小二乘偏移方法[J]. 吉林大学学报(地球科学版), 2014, 44(1): 369-374.

Huang Jianping，Xue Zhiguang，Bu Changcheng，Li Zhenchun，Wang Changbo, Gao Guochao，Cao Xiaoli， Li Guolei. The Study of Least-Squares Migration Method Based on Split-Step DSR[J]. Journal of Jilin University(Earth Science Edition), 2014, 44(1): 369-374.

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