The dielectric constant of sandstones, 60 kHz to 4 MHz
The dielectric constant of sandstones, 60 kHz to 4 MHz
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DOI：
10.1190/1.1442332
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发表时间：
1987-05
期刊：
影响因子：
3.3
通讯作者：
R. Knight;A. Nur
中科院分区：
文献类型：
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作者：
R. Knight;A. Nur
在5 Hz至4 MHz的频率范围内，收集了8个砂岩在不同含水饱和度（Sw）水平下的复阻抗数据。使用双电极技术进行测量，其中铂电极溅射到圆盘形样品的平坦面上。复阻抗平面中的数据显示，由于样品-电极界面处的极化引起的响应与主体样品响应明显分离。电极极化效应仅限于低于60 kHz的频率，使我们能够在60 kHz至4 MHz的频率范围内研究砂岩的介电常数κ′。在所有饱和度下的所有样本的κ′显示出对频率的明显幂律依赖性。比较Sw=0.36的八个砂岩的数据，发现频率依赖性的大小与砂岩孔隙空间的表面积与体积比成比例。每种砂岩的孔隙空间的表面积与体积比为：
Complex impedance data were collected for eight sandstones at various levels of water saturation (Sw) in the frequency range of 5 Hz to 4 MHz. The measurements were made using a two‐electrode technique with platinum electrodes sputtered onto the flat faces of disk‐ shaped samples. Presentation of the data in the complex impedance plane shows clear separation of the response due to polarization at the sample‐electrode interface from the bulk sample response. Electrode polarization effects were limited to frequencies of less than 60 kHz, allowing us to study the dielectric constant κ′ of the sandstones in the frequency range of 60 kHz to 4 MHz. κ′ of all samples at all levels of saturation shows a clear power‐law dependence upon frequency. Comparing the data from the eight sandstones at Sw=0.36, the magnitude of the frequency dependence was found to be proportional to the surface area‐to‐volume ratio of the pore space of the sandstones. The surface area‐to‐volume ratio of the pore space of each sandstone wa...