An effective imaging condition for reverse-time migration using wavefield decomposition

doi:10.1190/1.3533914

	An effective imaging condition for reverse-time migration using wavefield decomposition
	Liu, Faqi 1; Zhang, Guanquan 2; Morton, Scott A.1; Leveille, Jacques P.1
刊名	GEOPHYSICS
	2011
卷号	76 期号:1 页码:S29-S39
ISSN号	0016-8033
DOI	10.1190/1.3533914
英文摘要	Reverse-time migration (RTM) exhibits great superiority over other imaging algorithms in handling steeply dipping structures and complicated velocity models. However, low-frequency, high-amplitude noises commonly seen in a typical RTM image have been one of the major concerns because they can seriously contaminate the signals in the image if they are not handled properly. We propose a new imaging condition to effectively and efficiently eliminate these specific noises from the image. The method works by first decomposing the source and receiver wavefields to their one-way propagation components, followed by applying a correlation-based imaging condition to the appropriate combinations of the decomposed wavefields. We first give the physical explanation of the principle of such noises in the conventional RTM image. Then we provide the detailed mathematical theory for the new imaging condition. Finally, we propose an efficient scheme for its numerical implementation. It replaces the computationally intensive decomposition with the cost-effective Hilbert transform, which significantly improves the efficiency of the imaging condition. Applications to various synthetic and real data sets demonstrate that this new imaging condition can effectively remove the undesired low-frequency noises in the image.
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000286620500020
内容类型	期刊论文
源URL	[http://ir.amss.ac.cn/handle/2S8OKBNM/11921]
专题	中国科学院数学与系统科学研究院
通讯作者	Liu, Faqi
作者单位	1.Hess Corp, Geosci Technol, Houston, TX USA 2.Chinese Acad Sci, Acad Math & Syst Sci, State Key Lab Sci Engn, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Liu, Faqi,Zhang, Guanquan,Morton, Scott A.,et al. An effective imaging condition for reverse-time migration using wavefield decomposition[J]. GEOPHYSICS,2011,76(1):S29-S39.
APA	Liu, Faqi,Zhang, Guanquan,Morton, Scott A.,&Leveille, Jacques P..(2011).An effective imaging condition for reverse-time migration using wavefield decomposition.GEOPHYSICS,76(1),S29-S39.
MLA	Liu, Faqi,et al."An effective imaging condition for reverse-time migration using wavefield decomposition".GEOPHYSICS 76.1(2011):S29-S39.