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《应用地球物理(英文版)》 2012-03
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Seismic wavefield modeling in media with fluid-filled fractures and surface topography

Lan Hai-Qiang and Zhang Zhong-Jie 1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China. 2.Graduate School of Chinese Academy of Sciences,Beijing 100049,China.  
We present a finite difference(FD) method for the simulation of seismic wave fields in fractured medium with an irregular(non-flat) free surface which is beneficial for interpreting exploration data acquired in mountainous regions.Fractures are introduced through the Coates-Schoenberg approach into the FD scheme which leads to local anisotropic properties of the media where fractures are embedded.To implement surface topography,we take advantage of the boundary-conforming grid and map a rectangular grid onto a curved one.We use a stable and explicit second-order accurate finite difference scheme to discretize the elastic wave equations(in a curvilinear coordinate system) in a 2D heterogeneous transversely isotropic medium with a horizontal axis of symmetry(HTI).Efficiency tests performed by different numerical experiments clearly illustrate the influence of an irregular free surface on seismic wave propagation in fractured media which may be significant to mountain seismic exploration.The tests also illustrate that the scattered waves induced by the tips of the fracture are re-scattered by the features of the free surface topography.The scattered waves provoked by the topography are re-scattered by the fractures,especially Rayleigh wave scattering whose amplitudes are much larger than others and making it very difficult to identify effective information from the fractures.
【Fund】: sponsored by the Knowledge Innovation Program of the Chinese Academy of Sciences No.KZCX2-YW-132);; the Important National Science and Technology Specific Projects(No.2008ZX05008-006);; the National Natural Science Foundation of China Nos.41074033 40721003 40830315 and 40874041)
【CateGory Index】: P631.4
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【Citations】
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1 LAN Hai-Qiang1,2,ZHANG Zhi3,XU Tao1,BAI Zhi-Ming1 1 State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029,China 2 Graduate School of Chinese Academy of Sciences,Beijing 100049,China 3 Key Laboratory of Geological Engineering Centre of Guangxi Province,College of Earth Sciences, Guilin University of Technology,Guilin 541004,China;Effects due to the anisotropic stretching of the surface-fitting grid on the traveltime computation for irregular surface by the coordinate transforming method[J];Chinese Journal of Geophysics;2012-10
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1 LAN Hai-Qiang~(1,2),LIU Jia~(1,2),BAI Zhi-Ming~1 1 State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China 2 Graduate School of Chinese Academy of Sciences,Beijing 100049,China;Wave-field simulation in VTI media with irregular free surface[A];[C];2012
2 Lan Hai-Qiang and Zhang Zhong-Jie 1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China. 2.Graduate School of Chinese Academy of Sciences,Beijing 100049,China.;Seismic wavefield modeling in media with fluid-filled fractures and surface topography[A];[C];2013
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