The pilot study on characteristics of the seismic wave spectrum and gas content of coal seam

Abstract：In order to study the relations between seismic wave spectrum and geologiacl parameters of coal seam and gas, Several typical main coal seams under mines are selected, and the spot seismic is made to wave prospect experiments under the condition of the invariable mechanic seismic sources.The result indicates that the seismic spectrum characteristics reflect the physical mechanic property of coal seams.The dominant frequency keeps relative stability within the five times distance of the depth of the coal layer in the same structure.The variance in dominant frequency of coal seams reflects structural change of them, which is mostly lower than that of non-gas-burst ones.There is a good linear relativity between the seam gas content and the dominant frequency, which gas content and its dominant frequency go conversely.The result offers a method for coal and gas outbrust forecast.

Keyword：spectrum analysis;seismic spectrum characteristics;gas-content;gas-burst coal layer;