Wavefield separation and polarity reversal correction in elastic reverse time migration

doi:10.1016/j.jappgeo.2016.02.012

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Wavefield separation and polarity reversal correction in elastic reverse time migration
	Li, Zhiyuan 1; Ma, Xiaona 1,2; Fu, Chao 3; Liang, Guanghe 1
刊名	JOURNAL OF APPLIED GEOPHYSICS
	2016-04-01
卷号	127 页码:56-67
关键词	Wavefield separation Polarity reversal correction Polarization vector Elastic reverse time migration
DOI	10.1016/j.jappgeo.2016.02.012
文献子类	Article
英文摘要	In elastic reverse time migration (RTM), one of the problems that are often encountered is the cross-talk between P- and S-wavefields. A useful processing technique to reduce the cross-talk is separating the P- and S-wavefields by using divergence and curl operators before applying an elastic imaging condition. However, the separated wavefields lose their physical meaning because their phase and amplitude are changed. In this paper, we modify the divergence and curl operators to give the separated wavefields a clear physical meaning: the separated wavefield is the first derivative of the input wavefield with respect to time. Another problem often encountered is polarity reversals in PS and SP images, which can cause destructive interference in the final stacked image and thus destroy the migrated events. In this paper we also develop a procedure for polarity reversal correction based on the polarization vectors of the P- and S-wavefields in the common-shot domain. The correction factor is first calculated at every imaging point during the wavefield reconstruction and is then multiplied by the PS and SP images at each time step when an elastic imaging condition is applied. Numerical examples with synthetic data have shown that the modified wavefield separation method is correct, and the procedure of polarity reversal correction is effective for a complex model. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	COMMON-IMAGE GATHERS ; MODE SEPARATION ; VTI MEDIA ; S-WAVES ; DOMAIN ; 2D
WOS研究方向	Geology ; Mining & Mineral Processing
语种	英语
WOS记录号	WOS:000374073700006
资助机构	R&D of Key Instruments and Technologies for Deep Resources Prospecting (the National R&D Projects for Key Scientific Instruments)(ZDYZ2012-1-06) ; R&D of Key Instruments and Technologies for Deep Resources Prospecting (the National R&D Projects for Key Scientific Instruments)(ZDYZ2012-1-06) ; China Postdoctoral Science Foundation(2014M560116) ; China Postdoctoral Science Foundation(2014M560116) ; R&D of Key Instruments and Technologies for Deep Resources Prospecting (the National R&D Projects for Key Scientific Instruments)(ZDYZ2012-1-06) ; R&D of Key Instruments and Technologies for Deep Resources Prospecting (the National R&D Projects for Key Scientific Instruments)(ZDYZ2012-1-06) ; China Postdoctoral Science Foundation(2014M560116) ; China Postdoctoral Science Foundation(2014M560116)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53469]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shenhua Geol Explorat Co Ltd, Beijing 100011, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhiyuan,Ma, Xiaona,Fu, Chao,et al. Wavefield separation and polarity reversal correction in elastic reverse time migration[J]. JOURNAL OF APPLIED GEOPHYSICS,2016,127:56-67.
APA	Li, Zhiyuan,Ma, Xiaona,Fu, Chao,&Liang, Guanghe.(2016).Wavefield separation and polarity reversal correction in elastic reverse time migration.JOURNAL OF APPLIED GEOPHYSICS,127,56-67.
MLA	Li, Zhiyuan,et al."Wavefield separation and polarity reversal correction in elastic reverse time migration".JOURNAL OF APPLIED GEOPHYSICS 127(2016):56-67.