Characterization of sandstone by electrical spectroscopy for stratigraphical and hydrogeological investigations
Characterization of sandstone by electrical spectroscopy for stratigraphical and hydrogeological investigations
复制标题
通过电光谱表征砂岩，用于地层和水文地质调查
DOI：
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复制
发表时间：
2005
影响因子：
1.4
通讯作者：
R. Barker
中科院分区：
文献类型：
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作者：
Julian B. T. Scott;R. Barker
电光谱是电阻率和激发极化的地球物理技术的发展，其中电导率的同相和正交分量在一定频率范围内测量，在本研究中在0.001和1000 Hz之间。测量已经取得了二叠纪-三叠纪砂岩样品从钻孔在英国和饱和的合成地下水溶液。还选择一些样品用不同浓度的氯化钠溶液进行饱和。用光学显微镜检查了样品的岩性，并测量了孔隙度和孔喉尺寸等参数。由此可见，电谱受砂岩岩性的许多方面的强烈影响，包括碳酸盐和石英胶结作用。晶粒和孔喉尺寸及其分布是光谱频率依赖性中特别重要的因素。孔隙表面积是影响正交电导率大小的重要因素。电谱所包含的信息可能是今后地质地层学、水文地质学和石油地质学研究的一个非常有用的工具。电谱法可用于地面和钻孔地球物理测量。
Electrical spectroscopy is a development of the geophysical techniques of resistivity and induced polarization in which both the in-phase and quadrature components of conductivity are measured over a range of frequencies, in this study between 0.001 and 1000 Hz. Measurements have been made on Permo–Triassic sandstone samples taken from boreholes across the UK and saturated with a synthetic groundwater solution. Some samples were also selected for saturation with different strengths of sodium chloride solution. The lithology of the samples was examined using optical microscopy and parameters such as porosity and pore-throat size have been measured. From this it is clear that the electrical spectra are strongly influenced by many aspects of the sandstone lithology, including carbonate and quartz cementation. Grain and pore-throat size and their distribution are particularly important factors in the frequency dependence of the spectra. Pore surface area is an important influence on the magnitude of the quadrature conductivity. The information contained in the electrical spectra could be a very useful tool for future investigations in geological stratigraphy, hydrogeology and petroleum geology. Electrical spectroscopy can be used in both surface and borehole geophysical measurements.