油水驱替条件下岩石复电阻率测试与分析

Testing and Analysis of Rock Complex Resistivity Under the Condition of Oil-water Displacement

油水驱替,一个水驱油和油驱水的混合交替过程。测量了岩石的物理性质-复电阻率。复电阻率的研究建立在激发极化效应理论依据上,即在电化学的作用下,产生的人工激发极化电场规律。由其延伸的频谱激电法和复电阻率法,同样也是测试复电阻率的基础。在不同油水饱和度下进行油水驱替实验,测量幅频、相频的变化特征。以理想的Cole模型为基础,通过反演拟合得到频谱参数。利用实验数据及模型拟合,最终得出复电阻率的测试分析规律。

Oil-water displacement is a mixing and alternating process of water displacing oil and oil displacing water.In this paper, the physical properties of the rock, the complex resistivity was determined. The study of complex resistivity is based on the theoretical basis of induced polarization effect, namely, the law of induced polarization electric field generated under the action of electrochemistry. The extended spectrum IP and complex resistivity methods are also the basis for testing complex resistivity. Oil-water displacement experiments were carried out under different oil-water saturation to measure the variation characteristics of amplitude and frequency and phase frequency.Finally, based on the ideal Cole model, the spectrum parameters were obtained by inversion and fitting. The law of test and analysis of complex resistivity was explained by means of theoretical basis, experimental measurement,experimental data and model fitting.