Target-oriented beamlet migration based on Gabor-Daubechies frame decomposition

doi:10.1190/1.2187781

	Target-oriented beamlet migration based on Gabor-Daubechies frame decomposition
	Chen, L ; Wu, RS ; Chen, Y
刊名	GEOPHYSICS
	2006-03-01
卷号	71 期号:2 页码:S37-S52
ISSN号	0016-8033
DOI	10.1190/1.2187781
文献子类	Article
英文摘要	We develop beamlet propagation and imaging using Gabor-Daubechies (G-D) frame decomposition based oil local perturbation theory and apply it to target-oriented prestack depth migration. The method is formulated with local background velocities and local perturbations in wavefield extrapolation. The localized propagators and phase-correction Operators are obtained analytically or semianalytically by one-way operator decomposition and screen approximation in the beamlet and space-beamlet mixed domain. Beamlet wavefields have superior localization properties in both local space and direction (wave-number) over Gaussian beams in the sense that localizations are not limited within short propagation distances in either homogeneous or heterogeneous media. Comparisons of the prestack depth-migrated images for the 2D SEG-EAGE salt model and the Marmousi model indicate that, for seismic-wave propagation and imaging in complex structural environments, the G-D beamlet propagator has higher accuracy and better wide-angle propel-ties than do global propagators. Target-oriented prestack G-D beamlet migration is performed by means of local-angle-domain imaging and controlled Superposition of common-dip-angle images based on the local directivity features of the target structures. This considers the spatial and direction localizations of beamlets. As a numerical example, we process the 2D SEG-EAGE salt-model prestack data. The results show that the proposed migration method has considerable advantages in suppressing noise and enhancing structural features. Image quality for subsalt structures, especially for steep faults, is improved through structure-based superposition of common-angle images. This demonstrates the potential and capability of beamlet migration in target-oriented seismic imaging.
WOS关键词	PRESTACK DEPTH MIGRATION ; GAUSSIAN-BEAM ; FOURIER MIGRATION ; WAVE-PROPAGATION ; TRAVEL-TIMES ; ONE-WAY ; SCATTERING ; TRANSFORM ; ILLUMINATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000236539700024
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66822]
专题	中国科学院地质与地球物理研究所
通讯作者	Chen, L
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Calif Santa Cruz, Inst Geophys & Planetary Phys, Santa Cruz, CA 95064 USA 3.China Earthquake Adm, Beijing 100036, Peoples R China
推荐引用方式 GB/T 7714	Chen, L,Wu, RS,Chen, Y. Target-oriented beamlet migration based on Gabor-Daubechies frame decomposition[J]. GEOPHYSICS,2006,71(2):S37-S52.
APA	Chen, L,Wu, RS,&Chen, Y.(2006).Target-oriented beamlet migration based on Gabor-Daubechies frame decomposition.GEOPHYSICS,71(2),S37-S52.
MLA	Chen, L,et al."Target-oriented beamlet migration based on Gabor-Daubechies frame decomposition".GEOPHYSICS 71.2(2006):S37-S52.