The gas geology characteristics of II₁coal seam in Liangbei No.2 coal mine, Yuzhou coalfield, Henan province

Abstract：Gas geology characterization, gas occurrence discussion and outburst hazard assessment are important foundations of coal mine design during exploration.Based on data obtained during exploration, the gas content controlling factors in Liangbei No.2 coal mine is systemically analyzed, and gas outburst hazard is forecasted.The investigation indicates that the open normal faults are the main pathway for gas escape.The thickness of overburden strata above II1 coal seam is the main factor that controls the regional distribution of gas, which is the larger thickness, the higher coalbed methane content.The gas content is high in the deep stagnant zone of groundwater and II1 coal seam is outburst hazard seam.

Keyword：Liangbei No.2 coal mine;gas content;geology characteristic;gas outburst;