A quantitative analysis method for the seismic geological complexity of near surface

doi:10.6038/cjg20170319

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 > 地球深部结构与过程研究室

	A quantitative analysis method for the seismic geological complexity of near surface
	Chen Gao-Xiang 1; Fu Li-Yun 1; Yu Geng-Xin 1,2; Guan Xi-Zhu 1,3; Ge Shuang-Cheng 4
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2017-03-01
卷号	60 期号:3 页码:1062-1072
关键词	Quantitative Analysis Of Near Surface Complexity Scattering Amplitude Coefficient Matrix Boundary Element Discretization Scalar Complexity Coefficient
ISSN号	0001-5733
DOI	10.6038/cjg20170319
文献子类	Article
英文摘要	Complexity of the near surface is a major factor causing low signal-to-noise ratio in seismic data; it scatters and attenuates all the wavefields observed on the surface, which causes semi-random and semi-coherent near surface scattering background noise on shot gathers that mask deep reflected signals. How to study and evaluate the near surface scattering intensity has long been an unsolved problem in petroleum exploration, which is closely related to the roughness of surface, the near surface lateral velocity variation, and the angle distribution of oblique structures. Based on previous researches on wave equation numerical simulation for complex near surface structure using boundary element method, this article puts forward a complex scattering amplitude matrix method to analyze the scattering intensity near surface. First the complex near surface structure is discretized and collocated according to the boundary element method so as to form the matrix equation of the boundary integral equation. Instead of solving the matrix equations, which involves massive computation, we analyze the coefficient matrix of scattering amplitude by matrix analysis techniques in quest of the influence of complex near surface structure on different-frequency wavefields. This strategy uses the advantage of the boundary element method in accurately describing the geometrical characteristics of arbitrary boundaries to investigate how undulating surface and non-regular geological interface affect seismic wave propagation. The coefficient matrix of scattering amplitude is obtained by Gaussian numerical integration of the normal derivative of the fundamental solution on boundaries. This not only describes the interaction between two arbitrary points, but also includes the effect of morphological characters of different boundary elements, which provides the possibility for the evaluation of scattering intensities of different geological structures. As a preliminary evaluation method, we divide the summation of the matrix elements by its dimension as a scalar complex coefficient to characterize the scattering property of the scattering amplitude coefficient matrix, and a set of effective and fast computation methods is developed through theoretical and practical model tests.
WOS关键词	STEEP STRUCTURES ; KUQA DEPRESSION ; WAVE-EQUATION ; TOPOGRAPHY ; SCATTERING ; APPROXIMATION ; INTERFACES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000396386700019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53024]
专题	地质与地球物理研究所_地球深部结构与过程研究室
通讯作者	Chen Gao-Xiang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Div Earths Deep Struct & Proc, Beijing 100029, Peoples R China 2.Beijing Chinese Language & Culture Coll, Beijing 102206, Peoples R China 3.CNOOC Res Inst, Beijing 100027, Peoples R China 4.Zhejiang Inst Hydraul & Estuary, Hangzhou 310020, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Chen Gao-Xiang,Fu Li-Yun,Yu Geng-Xin,et al. A quantitative analysis method for the seismic geological complexity of near surface[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(3):1062-1072.
APA	Chen Gao-Xiang,Fu Li-Yun,Yu Geng-Xin,Guan Xi-Zhu,&Ge Shuang-Cheng.(2017).A quantitative analysis method for the seismic geological complexity of near surface.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(3),1062-1072.
MLA	Chen Gao-Xiang,et al."A quantitative analysis method for the seismic geological complexity of near surface".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.3(2017):1062-1072.