Block modeling and segmentally iterative ray tracing in complex 3D media

doi:10.1190/1.2192948

	Block modeling and segmentally iterative ray tracing in complex 3D media
	Xu, Tao ; Xu, Guoming ; Gao, Ergen ; Li, Yingchun ; Jiang, Xianyi ; Luo, Kaiyun
刊名	GEOPHYSICS
	2006-05-01
卷号	71 期号:3 页码:T41-T51
ISSN号	0016-8033
DOI	10.1190/1.2192948
文献子类	Article
英文摘要	We propose using a set of blocks to approximate geologically complex media that cannot be well described by layered models. Interfaces between blocks are triangulated to prevent overlaps or gaps often produced by other techniques. such as B-splines, and to speed up the calculation of intersection points between a ray and block interfaces. We also use a smoothing algorithm to make the normal vector of each triangle continuous at the boundary, so that ray tracing can be performed with stability and accuracy. Based on Fermat's principle, we perturb an initial raypath between two points, generally obtained by shooting, with a segmentally iterative ray-tracing (SIRT) method. Intersection points on a ray are updated in sequence, instead of simultaneously, because the number of new intersection points may be increased or decreased during the iteration process. To improve convergence speed, we update the intersection points by a first-order explicit formula instead of traditional iterative methods. Only transmitted and reflected waves are considered. Numerical tests demonstrate that the combination of block modeling and segmentally iterative ray tracing is effective in implementing kinematic two-point ray tracing in complex 3D media.
WOS关键词	WAVE-FRONT CONSTRUCTION ; DISCRETE SMOOTH INTERPOLATION ; TRAVEL-TIME ; HETEROGENEOUS MEDIA ; VELOCITY STRUCTURE ; ISOTROPIC MEDIA ; 2-POINT ; ALGORITHM ; INVERSION ; 2-D
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000238819700050
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67186]
专题	中国科学院地质与地球物理研究所
通讯作者	Xu, Tao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Chaoyang Dist, Peoples R China 2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui Prov, Peoples R China 3.Bur Geophys Prospect, Geophys Res Inst, CNPC, Hebei, Peoples R China
推荐引用方式 GB/T 7714	Xu, Tao,Xu, Guoming,Gao, Ergen,et al. Block modeling and segmentally iterative ray tracing in complex 3D media[J]. GEOPHYSICS,2006,71(3):T41-T51.
APA	Xu, Tao,Xu, Guoming,Gao, Ergen,Li, Yingchun,Jiang, Xianyi,&Luo, Kaiyun.(2006).Block modeling and segmentally iterative ray tracing in complex 3D media.GEOPHYSICS,71(3),T41-T51.
MLA	Xu, Tao,et al."Block modeling and segmentally iterative ray tracing in complex 3D media".GEOPHYSICS 71.3(2006):T41-T51.