Influence factors of frequency-dependent coefficient with GEMTIP model
Chang Yanjun1, Tohniyaz Tunyaz1, Wang Hanyu2
1. Institute of Geophysics and Geomatics, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China; 2. Wuhan Geo-Detection and Technology Co., Ltd, Wuhan, Hubei 430074, China
Abstract：We use the generalized effective-medium theory of induced polarization (GEMTIP) model to a-nalyze theoretically the frequency characteristics of the complex resistivity of rocks and ores filled with a variety of polarized grains,and then to study the main physical influence factors of frequency-dependent coefficient.The following understandings are obtained:A.When the shape and size of pola-rized particles are different,the spectral curve of complex resistivity becomes smooth and the frequency-dependent coefficient becomes smaller with the increase of the range of the polarized particles; B.When rocks and ores contain multi-type pola-rized grains with different polarization,the frequency-dependent coefficient also becomes smaller; C.When the polarization characteristics of polarized particles in rocks and ores are similar each other,the frequency-dependent coefficient mainly reflects the shape and size of the mineral particles.The understandings have important significances for the anomaly interpretation and the identification of polarized bodies based on the relative magnitude of the frequency-dependent coefficient.
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