中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Least-squares reverse-time migration of surface-related multiples

文献类型:期刊论文

作者Liu Xue-Jian1,2; Liu Yi-Ke1
刊名CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
出版日期2016-09-01
卷号59期号:9页码:3354-3365
关键词Least-Squares Reverse-Time Migration (LSRTM) Migration of multiples First-order multiples
DOI10.6038/cjg20160919
文献子类Article
英文摘要Surface-related multiples are traditionally treated as noise and are attenuated using surface-related multiples elimination (SRME) and/or radon-based multiple-elimination methods. Multiples penetrate into the subsurface several times and contain abundant reflection information of small angles. Compared with migrating of primaries, migrating of multiples extends all the receivers as second sources and sometimes provides additional subsurface illumination. For reverse-time migration (RTM) of all-order multiples, however, the main challenge is that undesired crosscorrelations between forward and backward propagated seismic waves generate so many crosstalk artifacts. The crosstalks may distribute in the whole image profile, which can destruct the true image of reflectors and mislead the interpreting result of a migrated image. Compared with conventional RTM, least-squares reverse-time migration (LSRTM) can invert recorded primaries as an image with more balanced amplitude and higher resolution. Moreover, we develop the conventional LSRTM to invert multiples as an image while iteratively suppressing crosstalk artifacts. However, LSRTM of multiples can't totally attenuate the artifacts in the image of multiples, and usually many iterations are required to invert a well-accepted image. Alternatively, if first-order multiples can be separated from all-order multiples in advance, LSRTM of first-order multiples can be developed to reduce the iteration number. With the same iterations used, compared with LSRTM of multiples, LSRTM of first-order multiples can provide a much cleaner image section and a similar true image of reflectors. The motivation to develop LSRTM of first-order multiples can be further summarized as: (1) conventional migration of first-order multiples can avoid the most undesired crosscorrelations between forward and backward propagated wavefields and can maintain some advantages of imaging multiples at the same time; although the subsurface information contributed by higher-order multiples is neglected, RTM of first-order multiples have already avoided most artifacts. (2) There are still some crosstalk artifacts in the RTM image of first-order multiples; then, compared with RTM of first-order multiples, LSRTM of first-order multiples can further enhance the image in detail by suppressing the crosstalk artifacts, balancing the amplitude, and improving the resolution.
WOS关键词ITERATIVE INVERSION ; REFLECTIONS ; SCATTERING
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000382903300019
源URL[http://ir.iggcas.ac.cn/handle/132A11/53362]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Engn Geomech, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Liu Xue-Jian,Liu Yi-Ke. Least-squares reverse-time migration of surface-related multiples[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(9):3354-3365.
APA Liu Xue-Jian,&Liu Yi-Ke.(2016).Least-squares reverse-time migration of surface-related multiples.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(9),3354-3365.
MLA Liu Xue-Jian,et al."Least-squares reverse-time migration of surface-related multiples".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.9(2016):3354-3365.

入库方式: OAI收割

来源:地质与地球物理研究所

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