Forward modeling of pseudo P waves in TTI medium using staggered grid

doi:10.6038/cjg20160325

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 > 中国科学院页岩气与地质工程重点实验室

	Forward modeling of pseudo P waves in TTI medium using staggered grid
	Wang Lu-Chen 1,2; Chang Xu 1; Wang Yi-Bo 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2016-03-01
卷号	59 期号:3 页码:1046-1058
关键词	Pseudo P wave Tilted transversely isotropic Staggered grid
DOI	10.6038/cjg20160325
文献子类	Article
英文摘要	A tilted transversely isotropic (TTI) medium is a good approximation for anisotropic problems. We discuss the property of a 3D tilted transversely isotropic (TTI) medium and use pseudo P waves to simulate the P component of the elastic wave field in the weak elastic anisotropy approximation. We compare forward features of 3 second-order difference equations of pseudo P waves based on Hooke's law, elastic wave projection and dispersion equation, respectively. Now numerical calculation of these equations uses regular grid finite difference method, which is of low efficiency, low accuracy and is unstable in TTI simulation. In order to improve the calculating accuracy, this paper builds the staggered grid finite difference format for each forwarding simulation. Comparing three different numerical expressions of pseudo P wave equation in a 3D TTI medium, we find that the method based on dispersion equation is more convenient to simulate elastic P wave propagation and has lowest numerical noise. By analyzing the frequency dispersion characteristics based on different angles of isotropic symmetry axis, we introduce appropriate SV wave velocity in calculation to keep calculation stable. An example of a 2D simple synthetic model shows that the staggered grid forwarding method allow us to obtain a smooth and stable pseudo P wave field. With this strategy, 2D BP TTI reverse time migration can also achieve basically stable migration results.
WOS关键词	REVERSE-TIME MIGRATION ; TRANSVERSELY ISOTROPIC MEDIA ; ANISOTROPIC MEDIA ; VELOCITY ; EQUATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000371754700025
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62024]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang Lu-Chen,Chang Xu,Wang Yi-Bo. Forward modeling of pseudo P waves in TTI medium using staggered grid[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(3):1046-1058.
APA	Wang Lu-Chen,Chang Xu,&Wang Yi-Bo.(2016).Forward modeling of pseudo P waves in TTI medium using staggered grid.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(3),1046-1058.
MLA	Wang Lu-Chen,et al."Forward modeling of pseudo P waves in TTI medium using staggered grid".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.3(2016):1046-1058.