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油水饱和泥质砂岩中流动电位的研究对于揭示含油储层震电勘探和动电测井的机理有着重要的意义.本文首先从岩石孔隙的微观结构出发,构造了描述水润湿条件下油水饱和泥质砂岩储层的毛管模型.在模型中依据油水流动遵守的Navier-Stokes方程和电化学传质动力学理论,建立了描述油水饱和泥质砂岩流动电位的数学方程,并数学模拟了岩石储渗参数对流动电位频散特性的影响规律.研究结果表明:储层孔隙内流体受到的粘滞力与惯性力控制着水相和油相的流动,从而决定了流动电位的频散特性.随着孔隙度的增大,油水两相各自的有效渗透率均增大;而含水饱和度的升高使得水相有效渗透率增大,油相有效渗透率减小.在水润湿条件下,流动电位耦合系数随含水饱和度升高而增大,随束缚水饱和度的升高而减小.另外,流动电位相对耦合系数也随含水饱和度的升高而增大,但无频散现象.
The study of flow potential in oil-water saturated shaly sandstones is of great significance for revealing the mechanism of electrokinetic logging and oil well logging in oil-bearing reservoirs.First, based on the microscopic structure of rock pores, A capillary model of shaly sandstone reservoirs is established in this model based on the Navier-Stokes equation and electrochemical mass transfer kinetics theory of oil-water flow. The mathematical equations describing the flow potential of oil-water saturated shaly sands are established. The results show that the viscous force and inertial force of the fluid in the pore of the reservoir control the flow of the water phase and the oil phase and thus determine the dispersion characteristics of the flow potential. With the increase of porosity, the effective permeability of oil-water two-phase increases, while the increase of water-saturation makes the effective permeability of water-phase increase and the effective permeability of oil-phase decrease.With the condition of water wetting, The coupling coefficient of flow potential increases with the increase of water saturation and decreases with the increase of irreducible water saturation.In addition, the relative coupling coefficient of flow potential also increases with the increase of water saturation, But no dispersion phenomenon.