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http://dx.doi.org/10.7582/GGE.2015.18.3.105

Resistivity Monitoring of Saturated Rock Cores at Room Temperature  

Lee, Sang Kyu (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Lee, Tae Jong (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Yi, Myeong-Jong (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Geophysics and Geophysical Exploration / v.18, no.3, 2015 , pp. 105-114 More about this Journal
Abstract
A long-term resistivity monitoring system has been developed for saturated cores in room temperature and humidity condition. A 3-channel water-pump continuously drops the water onto the top of saturated core sample surrounded by shrinkable tube as well as on the paper filters of the electrodes at both sides of the core sample, by which one can monitor the resistivity changes with maintaining full saturation of the rock core for a week or longer. Monitoring the resistivity changes has been performed with 3 kinds of rock samples including biotite gneiss, andesitic tuff, and shale for 9 days using the system. Consequently, it is proposed two hypothesis that conversion speed of temperature coefficient has close relation to the thermal properties of the rock sample and that the ratio of resistance between dry and saturated conditions for a rock sample can be related to the effective porosity of the sample. The ratio between dry and saturated resistance for the three rock types are 48, 705, and 2, while effective porosity was 3.7%, 3.3%, and 13.0%, respectively.
Keywords
saturated core sample; room temperature; resistivity; monitoring;
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Times Cited By KSCI : 4  (Citation Analysis)
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