丁集矿11-2煤层瓦斯赋存规律及瓦斯地质单元划分

Gas Occurrence Law and Division of Gas Geological Unit in 11-2 Coal Seam of Dingji Mine

为了揭示淮南煤田丁集矿11-2煤层瓦斯(煤层气)赋存分布规律,根据矿井地质构造分布特征,将其划分为6个瓦斯地质单元,运用瓦斯赋存构造逐级控制理论分析了各单元的瓦斯赋存特征。研究表明:不同形式的地质构造和煤层埋深是影响各单元瓦斯含量的主控因素;淮南煤田在早白垩纪中期至中新世早期遭受剥蚀,瓦斯大量解吸逸散,造成了矿井煤层瓦斯含量总体较低,分布不均衡性明显。认为丁集矿11-2煤层Ⅱ单元和Ⅴ单元是瓦斯抽采的有利区块。

In order to reveal the gas（ CBM） occurrence distribution laws in 11-2 coal seam of Dingji Mine,Huainan Coal Field,six gas geological units were divided mainly according to the distribution of the geological structures in mine in this article. The gas occurrence distribution laws and the unbalanced distribution were revealed by using the theory of tectonic-level-control of coalmine gas occurrence. The results show that geological structures in different forms and burial depths of coalbed are the main controlling factors that influence the gas content in each unit; Huainan Coal Field was denudated during the period from the middle period of the E. Cretaceous to the early period of the Miocene which led to the desorption and dissipation of much gas in coalbed and the gas content in study area is low in general and significantly unbalanced. On the basis of the study above,CBM drainage should focus in unit Ⅱ and Ⅴwhich are the favorable blocks and research on ground stress should be strengthened for better coal and gas outburst prevention.