Methane Source Identification in Coal Faces by Carbon Isotopic Analysis of Methane

The authors propose an approved integrated approach to assessing influence of coal–rock mass on coal faces by a gas-based criterion through the isotope analysis of coalbed methane. The quantitative ratios of carbon isotopes of methane are determined in coal samples and in mine air samples from seven operating mines in Kuzbass. The geometrical parameters of such zones are assessed, and the maximal methane volume capable to affect a coal face during its operation is found. It is emphasized that the gas volumes and the methane migration zone parameters differ greatly when found using a traditional method and the integrated approach with the carbon isotopic analysis of methane in mine air and in coal.