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A quantitative analysis method for the seismic geological complexity of near surface
Chen Gao-Xiang1; Fu Li-Yun1; Yu Geng-Xin1,2; Guan Xi-Zhu1,3; Ge Shuang-Cheng4
AbstractComplexity 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.
KeywordQuantitative Analysis Of Near Surface Complexity Scattering Amplitude Coefficient Matrix Boundary Element Discretization Scalar Complexity Coefficient
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000396386700019
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Document Type期刊论文
Corresponding AuthorChen Gao-Xiang
Affiliation1.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
Recommended Citation
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.
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