石泉煤矿3#煤层瓦斯含量主控因素分析

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 m³/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。

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

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 m³/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.