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Anisotropic characteristics of electrical responses of fractured reservoir with multiple sets of fractures

查看全文 作　　者：Shen [1,2,3]Jinsong;Su [1]Benyu;Guo [1]Naichuan 高影响力作者 机构地区：[1]Department of Geophysics, School of Resource and Information Technology, China University of Petroleum, Beijing 102249, China;[2]Key Laboratory of CNPC Geophysical Exploration, China University of Petroleum, Beijing 102249, China;[3]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China高影响力机构 出　　处：《Petroleum Science》索引2009年第6卷第2期,共12页高影响力期刊 基　　金：The authors also would like to acknowledge the support of the National Basic Research Program (973 Program) (2007CB209607) of China;National High-tech R&D Program (863 Program) (2007AA060502);the Fundamental Research Project (07A10303) of CNPC 摘　　要：In fractured reservoirs, the fractures not only provide the storage space for hydrocarbons, but also form the main flow channels which connect the pores of the matrix, so fractures dominate the productivity of reservoirs. However, because of the heterogeneity and randomness of the distribution of fractures, exploration and evaluation of fractured reservoirs is still one of the most diffi cult problems in the oil industry. In recent years, seismic anisotropy has been applied to the assessment of fractured formations, whereas electrical anisotropy which is more intense in fractured formations than seismic anisotropy has not been studied or used so extensively. In this study, fractured reservoir models which considered multiple sets of fractures with smooth and partly closed, rough surfaces were established based on the fractures and pore network, and the vertical and horizontal electrical resistivities were derived as a function of the matrix and fracture porosities according to Ohm's law. By using the anisotropic resistivity equations, variations of the electrical anisotropy of three types of fractured models under the conditions of free pressure and confi ning pressure were analyzed through the variations of the exerted pressure, matrix porosity, fracture aperture and formation water resistivity. The differences of the vertical and horizontal resistivities and the anisotropy between the connected and non-connected fractures were also analyzed. It is known from the simulated results that an increase of the confining pressure causes a decrease of electrical anisotropy because of the elasticity of the closed fractures and the decrease of the fracture aperture. For a fi xed fracture porosity, the higher the matrix porosity, the weaker the electrical anisotropy in the rock formation. 关 键 词：地震各向异性 裂缝性油藏 骨折 电力 电阻率各向异性 反应 特性 地层水电阻率
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