Numerical simulation of polarization effect in low-frequency interface of oil-gas reservoirs
XU Wei1, WEI Ran1, HUANG Hang1, KE Shizhen2
1. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China; 2. College of Geophysics, China University of Petroleum (Beijing), Beijing 102249, China
Abstract：Based on the pore capillary model of reservoir rock, this paper constructs the quantitative relationship between the macroscopic physical parameters of reservoirs and the conductivity and dielectric properties of microscopic pore fluids as well as an equivalent circuit model to quantitatively describe the polarization effect of low-frequency interface of reservoir rock. Compared with those of the traditional Cole-Cole equivalent circuit model, the parameters of the proposed equivalent circuit model show more explicit physical meaning and are more suitable for quantitatively characterizing the polarization effect of the low-frequency interface of the reservoir rock. The proposed equivalent circuit model is used to simulate the polarization effect of the low-frequency interface of rock samples saturated with saline water and oil-bearing rock samples, respectively, and the influence of pore-throat ratio, salinity, and water saturation of reservoir rock on resistivity dispersion of imaginary part is analyzed. The simulation results show that the modulus of the imaginary resistivity minimum is exponentially related to pore-throat ratio, salinity, and water saturation. Specifically, it increases as the pore-throat ratio improves and decreases as the salinity and water saturation rise. The numerical simulation results provide a theoretical and model basis for quantitatively evaluating the oil and gas in reservoirs by using the polarization effect of low-frequency rock interface.
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