On the specific polarizability of sands and sand-clay mixtures
On the specific polarizability of sands and sand-clay mixtures
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DOI：
10.1190/geo2014-0509.1
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发表时间：
2015-03
期刊：
影响因子：
3.3
通讯作者：
A. Weller;L. Slater;J. Huisman;O. Esser;F. Haegel
中科院分区：
文献类型：
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作者：
A. Weller;L. Slater;J. Huisman;O. Esser;F. Haegel
【摘要】比极化率cp的概念是假想电导率与比表面积之比，可以用来表示单位孔隙体积归一化表面积Spor的矿液界面极化，并解释流体化学和/或矿物学对诱导极化（IP）测量的控制。我们使用砂和砂粘土混合物的IP测量数据库来研究cp随粘土含量和/或矿物学的变化。当使用氮吸附（brunauer - emmet - teller - BET）方法计算Spor时，我们发现砂和砂-粘土混合物的cp明显不同，粘土的cp明显高于砂。然而，当使用湿态亚甲基蓝（MB）方法计算Spor时，这种差异大大减少，该方法还可以检测与干态BET方法无法获得的粘土矿物内层相关的表面积。此外，假想的电导……
ABSTRACTThe concept of specific polarizability cp, being the ratio between imaginary conductivity and specific surface area, can be used to represent the polarization of the mineral-fluid interface per unit pore-volume-normalized surface area Spor and to account for the control of the fluid chemistry and/or mineralogy on induced polarization (IP) measurements. We used a database of IP measurements on sands and sand-clay mixtures to investigate the variation in cp as a function of clay content and/or mineralogy. We found an apparent variation in cp between sands and sand-clay mixtures when Spor was calculated using the nitrogen adsorption (Brunauer-Emmett-Teller — BET) method, with clays having an apparently higher cp than sands. However, this variation was considerably reduced when Spor was calculated using a wet-state methylene blue (MB) method that also sensed the surface area associated with internal layers of clay minerals inaccessible with the dry-state BET method. Furthermore, the imaginary conducti...