应用逆散射级数波场预测和2D卷积盲分离压制层间多次波  

Wavefield prediction with inverse scattering series and 2D blind separation of convolved mixtures for suppressing internal multiples

作　　者：毕丽飞[1] 秦宁[1] 李钟晓 梁鸿贤[1] 李振春[3] 窦婧瑛 multiplesBI Lifei;QIN Ning;LI Zhongxiao;LIANG Hongxian;LI Zhenchun;DOU Jingying(Shengli Geophysical Research Institute of Sinopec,Dongying,Shandong 257022,China;College of Electronic Information,Qingdao University,Qingdao,Shandong 266071,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Research Institute of CNOOC Zhanjiang Branch,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中国石化胜利油田分公司物探研究院,山东东营257022 [2]青岛大学电子信息学院,山东青岛266071 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [4]中海油湛江分公司研究院,广东湛江524057

出　　处：《石油地球物理勘探》2020年第3期521-529,468,共10页Oil Geophysical Prospecting

基　　金：国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006);国家自然科学基金项目“基于卷积神经网络的多次波自适应相减方法”(41804110);中国石化优秀青年科技创新基金“潜山内幕散射波叠前深度偏移技术研究”(P18028-1);胜利油田科技攻关项目“地震层间多次波预测及压制技术研究”(YKW1901)联合资助

摘　　要：多次波压制是地震数据处理的重要环节。基于波动方程的预测相减法是压制层间多次波的常用方法,它包括层间多次波预测以及自适应相减两个步骤。文中提出了一种改进的层间多次波压制方法,通过引入阶跃函数、有限积分区间等假设条件简化逆散射级数公式,实现层间多次波的预测;然后引入2D卷积盲分离方法实现层间多次波的自适应匹配相减。理论模型试算及实际资料应用效果表明,该方法能在不依赖速度模型前提下高效实现层间多次波预测;采用的多道卷积盲分离自适应相减方法,比传统L2范数最小化自适应相减方法和单道卷积盲分离自适应相减方法,能在有效压制层间多次波的同时,更好地保护一次波。Multiple suppression is an important step of seismic data processing.The prediction subtraction method based on wave equation is a common one to suppress internal multiples.This method includes two steps:internal multiples prediction and adaptive subtraction.After introducing hypothesis conditions such as step function and finite integral interval,we proposed a simplified formula to simplify the inverse scattering series for predicting internal multiples,and then introducing adaptive subtraction based on 2 D blind separation of convolved mixtures to conduct adaptive subtraction with matching filters.Synthetic and field data have demonstrated that the method is data-driven and independent on a velocity model for predicting internal multiples.Furthermore,compared with the traditional method based on L2-norm and single-channel blind separation of convolved mixtures,the method based on multi-channel blind separation of convolved mixtures can better protect effective primary waves while suppressing internal multiples.

关 键 词：层间多次波 逆散射级数 2D卷积盲分离 自适应相减 数据驱动 

分 类 号：P631.4[天文地球—地质矿产勘探]