Temperature dependence of spectral induced polarization data: experimental results and membrane polarization theory
Temperature dependence of spectral induced polarization data: experimental results and membrane polarization theory
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光谱激发偏振数据的温度依赖性：实验结果和膜偏振理论
DOI：
10.1093/gji/ggw027
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发表时间：
2016
影响因子：
2.8
通讯作者：
Nordsiek
中科院分区：
文献类型：
--
作者：
Bairlein;Bücker;Hördt;Nordsiek
由于控制复杂电导率的各种温度相关参数，光谱诱导极化测量受到温度变化的影响。最重要的是离子迁移率的影响，它随着温度的升高而增加。它是孔隙中流体的电导率随温度升高而增加的原因，并影响矿物表面的双电层。这项工作是基于对13个不同来源的砂岩样品的实验室测量，这些样品具有不同的地质和岩石物理特征。我们测量了频率范围为0.01至100 Hz，温度范围为0至40°C的复杂阻抗。主要的观察结果是特征时间（由频率的倒数定义，相移最大时）随温度升高而减小。这种减少的强度因样品而异。相移幅度的温度依赖性不能轻易地推广，因为它取决于特定的样品。实验结果表明，忽略温度对复合电导率的影响可能会导致从松弛时间估计水力电导率的显著误差。我们还用膜极化的理论模型模拟了温度依赖性，并回顾了模型的一些性质，重点讨论了参数的温度依赖性。该模型再现了表征测量数据的几个特征，包括特征时间对温度的依赖性。三个样品的孔隙结构的计算机断层扫描和显微镜图像也使我们能够将建模中使用的几何参数与实际样品的孔隙尺度参数的差异联系起来。
Spectral induced polarization measurements are affected by temperature variations due to a variety of temperature-dependent parameters that control the complex electrical conductivity. Most important is the influence of the ion mobility, which increases with increasing temperature. It is responsible for the increase of the conductivity of the fluid in the pores with temperature and influences the electrical double layer on the mineral surface. This work is based on laboratory measurements of 13 sandstone samples from different sources with different geological and petrophysical characteristics. We measured the complex impedance in a frequency range from 0.01 to 100 Hz and a temperature range from 0 to 40 °C. The main observation is a decrease of the characteristic time (defined by the inverse of the frequency, at which the phase shift is maximum) with increasing temperature. The strength of this decrease differs from one sample to another. The temperature dependence of the phase shift magnitude cannot easily be generalized, as it depends on the particular sample. The experimental findings suggest that neglecting the influence of temperature on complex conductivity may lead to significant errors when estimating hydraulic conductivity from relaxation time. We also simulate the temperature dependence with a theoretical model of membrane polarization and review some of the model properties, with an emphasis on the temperature dependence of the parameters. The model reproduces several features characterizing the measured data, including the temperature dependence of the characteristic times. Computed tomography and microscope images of the pore structure of three samples also allow us to associate differences in the geometrical parameters used in the modelling with pore scale parameters of the actual samples.
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DOI：
--
发表时间：
1959
期刊：
影响因子：
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作者：
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影响因子：
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DOI：
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发表时间：
2010
期刊：
影响因子：
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作者：
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影响因子：
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作者：
Julian B. T. Scott;R. Barker
通讯作者：
R. Barker