测井技术2026，Vol.50Issue(1)：50-60,11.DOI:10.16489/j.issn.1004-1338.2026.01.005
长7段油页岩复电阻率频散特征及温度敏感性分析
Complex Resistivity Dispersion Characteristics and Temperature Sensitivity Analysis of Chang7 Member Oil Shale
摘要
Abstract
As an unconventional oil and gas resource with huge reserves,oil shale has attracted much attention.Studying the frequency dispersion and temperature sensitivity of the complex resistivity of oil shale is conducive to deepening the exploration and in-situ heating recovery technology of oil shale.In this study,experiments are conducted by sealing with soft silicone and heating in a water bath to measure the impedance spectra of the Chang7 oil shale in the temperature range of 25～95℃and the frequency range of 4 Hz～5 MHz.The experimental data are fitted with the second-order Cole-Cole model,and a systematic study is carried out on the parameter sensitivity and the influence of temperature on the complex resistivity characteristics.The results show that:① The complex resistivity dispersion of oil shale shows a dual polarization mechanism.The real part of the resistivity decreases stepwise with multiple slopes as the frequency increases,and the imaginary part of the resistivity shows a double-peak evolution characteristic.② The increase in temperature leads to an increase in ion mobility,a shortening of polarization relaxation time,and a weakening of energy dissipation.The absolute values of the real and imaginary parts of the complex resistivity decrease overall,and both the first polarization frequency and the interface polarization frequency increase exponentially with temperature.③ The first-order derivative of the real part of the resistivity with respect to the logarithm of the frequency is highly correlated with the imaginary part of the resistivity.The attenuation rate of the real part of the resistivity is the fastest when the polarization intensity is the highest.④ The determination coefficient R2 of the second-order Cole-Cole model fitting is generally higher than 0.98.The zero-frequency resistivity and relaxation time in the model parameters decrease significantly with increasing temperature,the polarization rate decreases in the high-temperature section,and the frequency coefficient fluctuates with temperature.The conclusion is that the second-order Cole-Cole model can effectively describe the dual polarization characteristics of oil shale.The research results deepen the understanding of the coupling relationship between the electrical properties of oil shale and temperature,and can provide a reference for the geophysical exploration and development of oil shale.关键词
复电阻率/温度敏感性/双极化机制/Cole-Cole模型/油页岩/极化频率/弛豫时间Key words
complex resistivity/temperature sensitivity/dual polarization mechanism/Cole-Cole model/oil shale/polarization frequency/relaxation time分类
天文与地球科学引用本文复制引用
万天豪,贾将,邱金满,郭润琦..长7段油页岩复电阻率频散特征及温度敏感性分析[J].测井技术,2026,50(1):50-60,11.基金项目
国家自然科学基金项目"油页岩阻抗频散机理及动态变频电热耦合机制"(42304139) （42304139）
四川省自然科学基金项目"页岩阻抗频散机理与电热耦合机制"(23NSFSC6107) （23NSFSC6107）
