下沟煤矿4煤瓦斯地质赋存及涌出量影响因素分析

Analysis of factors influencing gas geological occurrence and gas emission of No.4 coal seam in Xiagou coal mine

从地质构造、煤层埋深、上覆基岩厚度及煤层顶底板岩性分析了控制下沟煤矿4煤瓦斯赋存及其涌出量的主要地质因素。分析结果表明,在单斜区域瓦斯含量较高,在河岸单斜下盘瓦斯含量较小;瓦斯含量与煤层埋藏深度和上覆基岩基本上呈正相关关系;瓦斯含量与煤层顶底板泥岩厚度关系密切。煤层原始瓦斯含量越高、开采深度越大,下沟煤矿瓦斯涌出量越高,煤矿南部单斜构造区域瓦斯涌出量明显高于其他区域。

The main geological factors controlling gas occurrence and emission of No.4 coal seam in Xiagou coal mine were analyzed from the aspects of geological structure,buried depth of coal seam,overlying bedrock thickness and lithology of coal seam roof and floor.The results show that the gas content is higher in monoclinic area,gas content is small in riparian monoclinic footwall,the gas content is positively correlated with the coal seam buried depth and overlying bedrock thickness,the gas content is closely related to the thickness of mudstone in coal seam roof and floor,the gas emission increases with the increase of original gas content and mining depth in coal seam,and the gas emission in the southern monoclinic area of coal mine is obviously higher than that in other areas.