Research Of Gas Occurrence Distribution And Control Characteristics In Zhangchen No.3mine Primary Mineable Coal Seam

According to geological exploration period and exposing in the process of production of gas geological data, the paper analyzed gas occurrence regularity and control characteristics in Zhangchen NO.3 mine by the gas geology theory. Based on the analysis of the geological tectonic evolution and tectonic stress field in different period, and combined with the tectonic distribution characteristics of the mine, the paper further analyzed the impact of the fault, thickness of coal seam, dip angle of coal seam, lithologic of roof and floor, magmatic rocks, the distribution regularity of tectonic coal to the occurrence of gas distribution of mine, it is concluded that the fault zone and fissure zone of the mine are beneficial for gas occurrence, especially the fault and fissure of cutting seam are more beneficial for it, and both sides of the fault surface of extensional fault formed the banded concentration zone of stress.Combined with the buried depth of coal seam and the floor elevation of coal seam, it is identified that the depth of coal seam is the main gas occurrence control factor in NO.3 coal seam. The paper predicted gas content, gas emission and gas pressure to the undevelopped area by relevant mathematical model. In addition, the paper also analyzed the factors of gas outburst in Zhangchen mine, and concluded that deeper than the buried depth of 823 m is the zone of gas outburst in Zhangchen NO.3 coal seam.The paper studied the gas occurrence distribution and control characteristics in Zhangchen mine, and the research provides theoretical guidance for the deep mining.