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Abstract The two-gateway network parallel electrical technology is first prevented to explore the thin-coal area within coal face，which is a new geophysical surveying means for the geological anomaly bodies especially within the large width of coal faces that are difficult to be detected by the conventional radio-wave penetration method. With more simple data-collecting modes，the network parallel electrical method realizes the synchronous potential measurement of whole electrode array；so the data-collecting efficiency is greatly improved and the signal-to-noise ratio is also well enhanced. The collected data can be used for resistivity inversion of different electrode devices. The two-gateway two-dimensional resistivity tomography makes full use of the data collected by the network parallel electrical instrument from the several survey lines of both gateways with the electrodes set in the coal wall along the central lines；then，the resistivity variations between the two gateways are acquired. Based on the electrical property differences between thin-coal area and normal coal seam，the capable resistivity images of thin-coal area are analyzed. In addition to the known geologic data，property and distribution ranges of thin-coal area can be analyzed. The exploration case for thin-coal area from the mechanized coal face in Zhangji coal mine of Huainan Coal Mining Group Corporation shows that，the method can explore the areal extent of thin-coal area within coal face，which gives a good guidance to coal production.
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Received: 13 January 2009
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