地质构造对煤层气赋存的影响及其机理

Influence and Mechanism of Geological Structure on the Occurrence of Coalbed Methane

影响煤层瓦斯含量的主要因素是地质构造,不同类型的地质构造对煤层瓦斯含量的影响不同。为探究野川煤矿3#煤层瓦斯含量的主控因素,以及不同地质构造对煤层瓦斯治理的效果,分析了野川煤矿地质构造类型及数量,并利用地质钻孔对不同地质构造附近、不同埋深的煤层进行取样分析。结果表明,煤层瓦斯含量的主控因素为煤层埋深,且随着埋深的增加,瓦斯含量有增多的趋势;地质构造对局部区域煤层瓦斯赋存有影响,向斜轴部和背斜轴部易形成天然气富集区,瓦斯量高于正常水平。

The main factor affecting the gas content of coal seams is the geological structure,and different types of geological structures have different effects on the gas content of coal seams.In order to investigate the main controlling factors of the gas content of 3#coal seam in Yechuan Coal Mine and the effect of different geological formations on the gas control of coal seams,the types and numbers of geological formations in Yechuan Coal Mine were analyzed,and samples of coal seams near different geological formations at different burial depths were sampled and analyzed by using geological drilling holes.The results show that the main controlling factor of coal seam gas content is the burial depth of the coal seam,and the gas content tends to increase with the increase of the burial depth.Geological formations have an effect on the local area of coal seam gas storage,and it is easy to form natural gas-rich zones in the axial part of the inclined slope and the axial part of the backslope,and the gas quantity is higher than the normal level.