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《Chinese Journal of Geophysics》 2012-01
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Fracture parameters analyses in fracture-induced HTI double-porosity medium

KONG Li-Yun1,WANG Yi-Bo2*,YANG Hui-Zhu1 1 Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China 2 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China  
A fracture-induced horizontal transverse isotropic(HTI) double-porosity medium has been established by embedding a set of vertical fractures into the isotropic porous background rock in previous paper.In this paper,three main parameters of the fracture system,i.e.,fracture compliance,fracture porosity and fracture permeability,are studied to analyze their influence on seismic wave.The results show that the anisotropy increases with growing fracture compliance;comparing with the matrix system,the contribution of fracture porosity to equivalent porosity is small,while the influence of fracture permeability on equivalent permeability is great,which is in accord with the characteristic of low-porosity high-permeability of fracture system.Additionally,increasing fracture permeability can also enhance the amplitude of slow P-wave notably.
【Fund】: 国家重点基础研究发展计划(973计划)(2007CB209505)资助;; 国家十二五大型油气田及煤层气开发重大专项子课题(2011ZX05004-003)资助
【CateGory Index】: P618.13
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