基于改进广义S变换的时变反射系数反演  

Time-Varying Reflectivity Inversion Based on Modified Generalized S Transform

作　　者：李婧 王修田[1,2,3] 宋鹏 姜秀萍[1,2,3] 赵波 LI Jing;WANG Xiu-Tian;SONG Peng;JIANG Xiu-Ping;ZHAO Bo(College of Marine Geo-Sciences,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Mineral Resource,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266237 [3]海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2020年第6期109-118,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41574105,41704114)资助。

摘　　要：由于地层吸收衰减等因素的影响,实际地震子波会随传播时间及空间发生变化,因此,若采用统一子波对非平稳地震记录进行反演将导致所求反射系数的不准确。本文利用改进广义S变换对地震资料进行时频分析,据此提取时变地震子波,重新构建时变子波褶积模型并求解相应的L1范数稀疏约束正则化问题,实现了基于改进广义S变换的时变反射系数反演,由此可获得与常规方法相比具有更高精度的反演结果。The real seismic wavelet varies with travel time and space due to the stratigraphic absorption and attenuation.Therefore,using a unique seismic wavelet in inversion for a non-stationary seismic record may lead to an inaccurate reflectivity inversion result.This paper makes use of the modified generalized S transform for seismic time-frequency analysis and extracts the time-varying seismic wavelet from the time-frequency spectrum.The time-varying reflectivity inversion approach based on modified generalized S transform is realized by reconstructing the time-varying convolution model and solving the corresponding L1 norm sparse constrained regularization problem.The inverted result can have higher precision than that of the conventional inversion.

关 键 词：反射系数反演 L1范数稀疏约束正则化 时变子波 改进广义S变换 

分 类 号：P631.414[天文地球—地质矿产勘探]