Optimum split-step Fourier 3D depth migration: Developments and practical aspects

doi:10.1190/1.2715658

	Optimum split-step Fourier 3D depth migration: Developments and practical aspects
	Zhang, Jianfeng; Liu, Linong
刊名	GEOPHYSICS
	2007-05-01
卷号	72 期号:3 页码:S167-S175
ISSN号	0016-8033
DOI	10.1190/1.2715658
文献子类	Article
英文摘要	We present an efficient scheme for depth extrapolation of wide-angle 3D wavefields in laterally heterogeneous media. The scheme improves the so-called optimum split-step Fourier method by introducing a frequency-independent cascaded operator with spatially varying coefficients. The developments improve the approximation of the optimum split-step Fourier cascaded operator to the exact phase-shift operator of a varying velocity in the presence of strong lateral velocity variations, and they naturally lead to frequency-dependent varying-step depth extrapolations that reduce computational cost significantly. The resulting scheme can be implemented alternatively in spatial and wavenumber domains using fast Fourier transforms (FFrs). The accuracy of the first-order approximate algorithm is similar to that of the second-order optimum split-step Fourier method in modeling wide-angle propagation through strong, laterally varying media. Similar to the optimum split-step Fourier method, the scheme is superior to methods such as the generalized screen and Fourier finite difference. We demonstrate the scheme's accuracy by comparing it with 3D two-way finite-difference modeling. Comparisons with the 3D prestack Kirchhoff depth migration of a real 3D data set demonstrate the practical application of the proposed method.
WOS关键词	WAVE-FIELD EXTRAPOLATION ; OPERATOR ; MEDIA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000246854400029
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67248]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Jianfeng
作者单位	Chinese Acad Sci, State Key Lab Lithosphere Evolut, Inst Geol & Geophy, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jianfeng,Liu, Linong. Optimum split-step Fourier 3D depth migration: Developments and practical aspects[J]. GEOPHYSICS,2007,72(3):S167-S175.
APA	Zhang, Jianfeng,&Liu, Linong.(2007).Optimum split-step Fourier 3D depth migration: Developments and practical aspects.GEOPHYSICS,72(3),S167-S175.
MLA	Zhang, Jianfeng,et al."Optimum split-step Fourier 3D depth migration: Developments and practical aspects".GEOPHYSICS 72.3(2007):S167-S175.