Water flooding disasters are one of the five natural coal-mining disasters that threaten the lives of coal miners.The main causes of this flooding are water-conducting fractured zones within coal seams.However,when resistivity methods are used to detect water-conducting fractured zones in coal seams,incorrect conclusions can be drawn because of electrical anisotropy within the water-conducting fractured zones.We present,in this paper,a new geo-electrical model based on the geology of water-conducting fractured zones in coal seams.Factors that influence electrical anisotropy were analyzed,including formation water resistivity,porosity,fracture density,and fracture surface roughness,pressure,and dip angle.Numerical simulation was used to evaluate the proposed electrical method.The results demonstrate a closed relationship between the shape of apparent resistivity and the strike and dip of a fracture.Hence,the findings of this paper provide a practical resistivity method for coal-mining production.
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