基于Seislet变换的稀疏约束多震源最小二乘逆时偏移  

Sparse constrained multi-source least-squares reverse-time migration using Seislet transform

作　　者：田坤[1] 于海铖[1] 张学涛[1] 步长城[1] 李国磊[1] 李振春[2] 张凯[2] 范景文 TIAN Kun;YU Hai-cheng;ZHANG Xue-tao;BU Chang-cheng;LI Guo-lei;LI Zhen-chun;ZHANG Kai;FAN Jing-wen(Geophysical Research Institute, Shengli Oilfield Company, S1NOPEC , Shanclong Dongying 257022, China;School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《地球物理学进展》2018年第3期1142-1148,共7页Progress in Geophysics

基　　金：国家自然科学基金项目(41374122);中石化胜利油田分公司科技攻关项目(YKW1602)联合资助

摘　　要：多震源地震采集技术允许一次性激发不同位置处的震源,得到来自多个震源的混合地震数据,该技术采集效率高,能有效降低采集成本.多震源地震数据成像效率高,但在偏移剖面中会引入串扰噪声,影响成像精度.最小二乘偏移常被用于压制多震源地震数据成像中的串扰噪声,但常规的最小二乘偏移并不能很好的消除串扰噪声对成像结果的影响,难以满足成像精度的要求.因此,为了保证反演的稳定性并改善反演结果,根据反射系数在Seislet域的稀疏性,本文引入了Seislet变换作为变换域稀疏约束的变换算子,实现了基于Seislet变换的稀疏约束多震源最小二乘逆时偏移,数值实验表明该方法能有效压制串扰噪声.The technology of multi-source seismic acquisition allows more than one source to be activated at different points,to obtain blended seismic data from multi-source. This technology has high efficiency and reduce the acquisition cost effectively. It is efficient and can avoid error of multi-source seismic data separation. But the disadvantage of this method is that it will introduce crosstalk noise caused by different gathers coherent into migration section,which will affect the imaging accuracy. The least-squares reverse-time migration method cannot well eliminate the effect of crosstalk noise on imaging results and it is difficult to meet the requirements of imaging accuracy. Therefore,in order to ensure the stability of inversion and improve the inversion results,and considering the sparseness of the reflection coefficient in Seislet domain, we introduce the Seislet transform to sparse constraint the imaging results,and therefore realize the spare constrained multi-source least-squares reverse-time migration process. The numerical experiments show that the method can effectively suppress the crosstalk noise.

关 键 词：多震源地震采集 最小二乘逆时偏移 串扰噪声 稀疏约束 

分 类 号：P631[天文地球—地质矿产勘探]