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通过室内实验,研究了不同岩性、润湿性、渗透率等条件下岩心油驱水和水驱油过程中岩石电阻率的变化,分析了流体流动对低渗岩石电阻率和阿尔奇饱和度指数以及地层因素的影响。实验结果表明:①低渗透油层亲水岩心和亲油岩心的电阻率随含水饱和度的增加而降低。②岩心渗透率越高饱和度指数越高,渗透率越低饱和度指数越低;亲油岩心电阻率较大,亲水岩心电阻率较小。③岩心渗透率越高,岩心的电阻率越低;岩心渗透率越低,岩心电阻率越高。④在相同的驱替速度下,电阻率随围压的增加而增加。⑤低渗透储层亲水岩石的饱和度指数值大于亲油岩石的饱和度指数值。
Through laboratory experiments, the changes of rock resistivity in the process of water flooding and water flooding under different conditions of lithology, wettability and permeability were studied. The influence of fluid flow on the resistivity of rock and the Archie saturation Index and the influence of formation factors. The experimental results show that: (1) The resistivity of hydrophilic core and lipophilic core in low permeability oil reservoir decreases with the increase of water saturation. ② The higher the core permeability is, the higher the saturation index is. The lower the permeability is, the lower the saturation index is. The higher the resistivity of the hydrophilic core and the lower the resistivity of the hydrophilic core. The higher the core permeability, the lower the resistivity of the core; the lower the core permeability, the higher the resistivity of the core. In the same displacement speed, resistivity increases with the increase of confining pressure. ⑤ The saturation index of hydrophilic rocks in low-permeability reservoirs is greater than the saturation index of oleophilic rocks.