泥质砂岩电容率影响因素分析

Effect of Clay Sandstones Contents on Core′s Dielectric Constant

地层岩石为多孔充液介质,电学特征复杂,在外加电场作用下,发生非常复杂的物理化学变化。依据电化学原理,结合双电层理论,对饱和溶液矿化度和泥质含量对岩心电容率的影响进行理论分析。结果表明,岩心电容随溶液矿化度和岩心泥质含量的增大而增大。对不同泥质含量的岩心进行不同矿化度下的岩心电容实验测量证明理论的正确性,为研究矿化度和泥质含量对岩心复电阻率的影响具有指导意义。

Formation rocks are multi-pore liquid-filled medium with complex electricity, and electrochemistry changes often appear there due to outside electric field function. According to the electrochemistry theory and double iron theory, the research deduced the relation between core＇s dielectric constant and the saturated resolution＇s salinity and clay content. Experiment results indicate that the core＇s dielectric constant increases with the increase of salinity and the clay content. The study measures the capacitance of cores which have different clay contents and different salinities. The obtained data show that the theoretic analysis is correct. This theory can be used to study the relation between complex resistivity and saturated resolution salinity and clay content.