石泉煤矿3#煤层瓦斯含量主控因素分析

Analysis of Main Controlling Factors of Gas Content in No.3 Coal Seam of Shiquan Coal Mine

在系统分析研究石泉煤矿井区地质背景和煤层发育情况的基础上,以钻井、实验测试数据为资料依据,讨论了石泉煤矿3#煤层瓦斯含量分布特征,瓦斯含量跨度较大(2.36~22.31 m^(3)/t),低值区分布在井田北部,该区域具有甲烷含量低(13.4%~42.06%)且氮气含量高(56.93%~84.12%)的特点。依据此特点,从顶底板条件、地质构造、煤层发育程度、埋藏深度、煤质等方面入手,深入分析了3#煤层瓦斯含量主控因素。结果表明:风化带是影响瓦斯含量的主要因素,同时,褶皱构造、埋藏深度、灰分对瓦斯含量亦具有一定程度的影响。

Based on the geological settings and coal seam development in Shiquan coal mine,using drilling, and experimental test data, the gas content distribution characteristics of 3#coal seam are discussed, the result shows the gas content spans are relatively large(2.36 to 22.31 m^(3)/t), the low value zone of gas content existed in the north of the well field, and the area have the characteristics of low methane content(13.4% to 42.06%) and high nitrogen content(56.93% to 84.12%). According to the characteristics, starting from roof and floor conditions, geological structure, coal seam development degree, buried depth, and coal quality, the main controlling factors of 3#coal seam gas content are further comprehensively analyzed. The result shows the mainly controlling factors of 3#coal seam gas content are gas weathering zone, meanwhile, the fold structure, buried depth and ash content are also have some effect on gas content.