高压条件下含导电矿物的人工砂岩复电阻率研究

天然岩样由于孔隙结构复杂、骨架成分非单一，导致复电阻率研究困难。考虑到根据理想模型制作的人工岩样能够更好地进行实验研究，选用黄铜粉、黄铁矿砂、石墨粉、环氧树脂等材料，人工合成了不同矿物含量的柱状标准岩样，在不同高压条件下使用AutoLab-1000设备测量了标样的复电阻率，并基于Debye分解模型反演获得了人工砂岩标样的零频电阻率、极化率、时间常数等参数；详细讨论了各个模型参数与导电矿物含量、连通性、地层压力等因素的关系，研究发现地层压力和矿物成分对极化率有较大的影响。研究结果对认识高压条件下人工砂岩标样的电性特征具有实际意义。 

Study on complex resistivity of artificial sandstone containing conductive mineral under high pressure

Due to the complex pore structure and non-single skeleton composition, natural rock samples are more difficult to study than artificial rock samples. The standard rock samples with different mineral content and volume content were artificially synthesized by using brass powder, pyrite sand, graphite powder, epoxy resin, etc. Complex resistivity measurements were taken to the samples by using AutoLab-1000 equipment under different formation pressure conditions. The complex resistivity and the parameters of zero frequency resistivity, polarizability, and time constant of the artificial sandstone standard were derived based on Debye decomposition model. Made a discussion on relationship between parameters of the model, including volume contents of conductive minerals, connectivity, formation pressure and other factors. Formation pressure and mineral composition have been found to have a large effect on polarizability. Research results are of great significance for understanding the electrical characteristics of artificial sandstone samples under high pressure.