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http://dx.doi.org/10.9720/kseg.2011.21.4.323

Application of the Electrical Impedance of Rocks in Characterizing Pore Geometry  

Choo, Min-Kyoung (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Song, In-Sun (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Hi-Kweon (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Tae-Hee (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Chang, Chan-Dong (Department of Geology and Earth Environmental Sciences, Chungnam National University)
Publication Information
The Journal of Engineering Geology / v.21, no.4, 2011 , pp. 323-336 More about this Journal
Abstract
The hydro-mechanical behavior of the Earth's crust is strongly dependent on the fractional volume and geometrical structure of effective pore spaces. This study aims to understand the characteristics of pores using electrical impedance. We measured the electric impedance of core samples (diameter, 38-50 mm; length, 70-100 mm) of three types of granite (Hwangdeung, Pocheon, and Yangsan) and two types of sandstone (Boryung and Berea) with different porosities and pore structures, after saturation with saline water of varying salinities. The results show that resistance decreases but capacitance increases with increasing salinity of the pore fluid. For a given salinity, the resistivity and formation factor are reduced with increasing porosity of the rocks, and the capacitance increases. Berea sandstone shows anisotropy in resistance, tortuosity, and cementation factor, with these factors being highest normal to bedding planes. This result indicates that the connectivity of pores is weakest normal to bedding. In conclusion, the electrical characteristics of the tested samples are related not only to their porosity but also to the pore geometry.
Keywords
Resistivity; porosity; formation factor; tortuosity; cementation factor;
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Times Cited By KSCI : 7  (Citation Analysis)
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