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Velocity field of wave-induced local fluid flow in double-porosity media

Science China(Physics,Mechanics & Astronomy) 2014年第6期57卷 1020-1030页

作者： BA Jing ZHANG Lin SUN WeiTao HAO ZhaoBing Geophysical Department Research Institute of Petroleum Exploration and Development School of Geosciences China University of Petroleum (Eastern China) Zhou Pei-Yuan Center for Applied Mathematics Tsinghua University Key Laboratory of Integrative Researches on Geophysics for petroleum Institute of Geology and GeophysicsChinese Academy of Sciences

Under the excitation of elastic waves,local fluid flow in a complex porous medium is a major cause for wave dispersion and *** the local fluid flow process is simulated with wave propagation equations in the double-porosity medium,two porous skeletons are usually assumed,namely,host and *** them,the volume ratio of inclusion skeletons is *** previous studies have ignored the consideration of local fluid flow velocity field in inclusions,and therefore they can not completely describe the physical process of local flow oscillation and should not be applied to the situation where the fluid kinetic energy in inclusions cannot be *** this paper,we analyze the local fluid flow velocity fields inside and outside the inclusion,rewrite the kinetic energy function and dissipation function based on the double-porosity medium model containing spherical inclusions,and derive the reformulated Biot-Rayleigh(BR)equations of elastic wave propagation based on Hamilton’s *** present simulation examples with different rock and fluid *** between BR equations and reformulated BR equations show that there are significant differences in wave response ***,we compare the reformulated BR equations with the previous theories and experimental data,and the results show that the theoretical results of this paper are correct and effective.

关键词： double-porosity medium elastic wave propagation local fluid flow velocity dispersion Biot-Rayleigh equations petro-physical experiment

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