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
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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 |
DOI | 10.6038/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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