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STUDY OF RESIDUAL GAS CONTENT OF COAL SEAMS IN ERUNAKOVSKY DEPOSIT OF KUZBASS

: The article presents the results of mine observations of methane emission in mining of highly contiguous coal seams and determines the dependence of daily production growth on the increasing rock width between seams, which is associated with a decrease in migration of methane from lower overworked coal seam into the workings of the upper seam. For substantiation of parameters of ventilation of extraction panel working located below along the seam inclination, the residual gas content of coal seams was determined by a complex method including the collection of coal samples from boreholes in the mine conditions, evaluation of methane desorption rate and reservoir properties of 35 coal cores in the laboratory conditions, numerical modeling of the distribution of permeability, porosity and pressure of methane in coal seam. The research takes into account the spatial location of mine workings, the width of rock strata between layers, and the stress-strain state of the rock strata. Based on the content of permanent carbon isotopes C 12 and C 13 in coal samples, the criterion for separating the mantle and biochemical genesis of methane is justified. The comparison of in-seam gas drainage methane extracted from the worked-out space by means of ventilation within the extraction panel was carried out. It was found that with the natural gas content of 20.0 m 3 /t, a total of 3.80 m 3 /t of methane was extracted, and according to the results of laboratory analysis, the obtained residual methane content was 3.77 m 3 /t, that is, it was proved that traditional methods of degassing provide methane extraction only within the filter pore volume in coal seams.