平煤十二矿己_(15)煤层瓦斯地质规律研究

Research on Gas- geology Law of Ji_(15) Seam in No.12 Mine of Pingdingshan

运用瓦斯地质理论,结合地质勘探和矿井生产揭露的瓦斯地质资料,研究了十二矿己15煤层的瓦斯地质规律。综合分析了地质构造、煤层厚度、煤层顶底板岩性、煤层埋深和上覆基岩厚度对煤层瓦斯赋存的影响。提出了地质构造控制己15煤层瓦斯赋存和分布,受构造控制井田划分为牛庄向斜南翼区、牛庄向斜和郭庄背斜共翼区及郭庄背斜北翼区3个瓦斯地质单元,并分析了构造对各瓦斯地质单元内瓦斯赋存的控制;己15煤层厚度大,煤层顺层滑动,构造煤成层发育,直接顶底板岩性大部分为砂质泥岩或泥岩且厚度变化小,利于瓦斯赋存;十二矿第四纪松散层垂向差异大,上覆基岩厚度相对煤层埋深对瓦斯赋存分布控制更准确,上覆基岩厚度主导各瓦斯地质单元内瓦斯赋存。

Using gas geological theory, combing with the geological exploration and the gas geological data revealed in the mine produc- tion, the article reseraches the gas - geology laws of the Ji15 seam of Pingdingshan No. 12 Mine. The research also analyzed the effects of geological tectonic, thickness of coal seam, the lithologies of coal seam roof and floor, burial depth of coal seam and the overlying bed- rock thickness on the gas occurrence. The research revealed that the geological tectonic controled the gas occurrence and distribution of Ji15 seam. Controlled field by the structure is divided into the south area of Niuzhuang syncline, the area between Niuzhuang syncline and Guozhuang anticlinal and the north area of Guozhuang anticline three gas - geological units. The article analyzed the control of structure on gas occurrence of each gas geological unit. The thickness of Jib5 is big and coal seam is bedding sliding, the tectonic coal developed with stratification, the direct roof and floor lithologics are mostly sandy mudstone and shale and thickness changes little, which is good for gas occurrence. The vertical difference of No. 12 Mine quaternary loose layer is big, the thickness of oveylying bedrock is more accurate than coal buried depth on gas occurrence. The thickness of the overlying bedrock controls gas occurrence of each geologic unit.