STUDY OF CONNECTIVITY OF FRACTURED POROUS MEDIA BASED ON DUAL-PERCOLATION MODEL
ZHENG Wei1,LU Xiaobing1,LIU Qingjie2,ZHANG Xuhui1
(1. Key Laboratory for Hydrodynamics and Ocean Engineering,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;2. Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)
Abstract:Pores and fractures are two main flow channels in fractured porous media. Under low and ultra-low permeability conditions,whether seepage occurs in media or not is decided by whether pores and fractures can form a penetrated channel or not. A dual-percolation model coupled the pore percolation theory and the fracture percolation theory is presented to study the conductivity of the low and ultra-low fractured porous media. Based on the presented dual-percolation model,two parameters and D are presented to reflect and compare the conductivities of fractured porous media;and the physical meaning of these two parameters is quantitatively discussed. The connectivity of low and ultra-low permeability fractured porous media is investigated based on these two parameters. It is shown that the low and ultra-low permeability fractured porous media can be generally divided into three types by taking as the critical value,i.e. dispersion type,critical type,and directional type. Media are self-sealing when and they can be named as directional type. However,with the enhancements of randomnesses of porous connectivity and fracture directions,the self-sealing tendency will be destroyed and the conductivity will increase,which causes the media tending to become dissipation type. A few long fractures can play a great role on the connectivity of media.
郑 委1,鲁晓兵1,刘庆杰2,张旭辉1. 基于双重逾渗模型的裂隙多孔介质连通性研究[J]. 岩石力学与工程学报, 2011, 30(6): 1289-1296.
ZHENG Wei1,LU Xiaobing1,LIU Qingjie2,ZHANG Xuhui1. STUDY OF CONNECTIVITY OF FRACTURED POROUS MEDIA BASED ON DUAL-PERCOLATION MODEL. , 2011, 30(6): 1289-1296.
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