Reverse-time migration from rugged topography using irregular, unstructured mesh

doi:10.1111/1365-2478.12415

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 > 中国科学院油气资源研究重点实验室

	Reverse-time migration from rugged topography using irregular, unstructured mesh
	Liu, Qiancheng 1,2; Zhang, Jianfeng 1; Gao, Hongwei 1
刊名	GEOPHYSICAL PROSPECTING
	2017-03-01
卷号	65 期号:2 页码:453-466
关键词	Unstructured Mesh Near Surface Reverse-time Migration
ISSN号	0016-8025
DOI	10.1111/1365-2478.12415
文献子类	Article
英文摘要	We developed a reverse-time migration scheme that can image regions with rugged topography without requiring any approximations by adopting an irregular, unstructured-grid modelling scheme. This grid, which can accurately describe surface topography and interfaces between high-velocity-contrast regions, is generated by Delaunay triangulation combined with the centroidal Voronoi tessellation method. The grid sizes vary according to the migration velocities, resulting in significant reduction of the number of discretized nodes compared with the number of nodes in the conventional regular-grid scheme, particularly in the case wherein high near-surface velocities exist. Moreover, the time sampling rate can be reduced substantially. The grid method, together with the irregular perfectly matched layer absorbing boundary condition, enables the proposed scheme to image regions of interest using curved artificial boundaries with fewer discretized nodes. We tested the proposed scheme using the 2D SEG Foothill synthetic dataset.
WOS关键词	CENTROIDAL VORONOI TESSELLATIONS ; PERFECTLY MATCHED LAYERS ; SV-WAVE PROPAGATION ; HETEROGENEOUS MEDIA ; IMAGING CONDITION ; DEPTH MIGRATION ; GRID METHOD ; LAND DATA ; EXTRAPOLATION ; GENERATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	WILEY
WOS记录号	WOS:000398832100004
资助机构	National Natural Science Fund of China(41574135 ; CNPC ; 41330316) ; National Natural Science Fund of China(41574135 ; CNPC ; 41330316) ; National Natural Science Fund of China(41574135 ; CNPC ; 41330316) ; National Natural Science Fund of China(41574135 ; CNPC ; 41330316)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52970]
专题	地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者	Zhang, Jianfeng
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, POB 9825, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Qiancheng,Zhang, Jianfeng,Gao, Hongwei. Reverse-time migration from rugged topography using irregular, unstructured mesh[J]. GEOPHYSICAL PROSPECTING,2017,65(2):453-466.
APA	Liu, Qiancheng,Zhang, Jianfeng,&Gao, Hongwei.(2017).Reverse-time migration from rugged topography using irregular, unstructured mesh.GEOPHYSICAL PROSPECTING,65(2),453-466.
MLA	Liu, Qiancheng,et al."Reverse-time migration from rugged topography using irregular, unstructured mesh".GEOPHYSICAL PROSPECTING 65.2(2017):453-466.