Study on Coal Conductive Properties of Different Coal Structure

In order to correctly explain the primary structure coal and structure coal from the logging curves for the guidance of the mine safety production and coal bed methane development, the 4263B mode LCR parameter measuring meter was applied to measure the apparent resistance rate of the primary structure coal and str ucture coal under the different frequency of 1、10、100 kHz.The measuring results showed that the apparent resistance rate of the structure coal would be lower than t he apparent resistance rate of the primary structure coal, the apparent resistance rate of the coal and rock in the bituminous coal stage would be increased with the incr easing of the metamorphism degree and would be decreased when in the anthracite coal stage.The coal apparent resistance rate would be inversely proportional to the test frequency, the conductivity of coal would have anisotropic features and the coal resistance rate in the different polarization direction would be different.The study 0 n the conductivity difference of the primary structure coal and structure coal would be favorable to improve the accuracy of the logging curve explanation.