登封煤田二1煤层煤层气赋存规律及影响因素分析

Preserving Rules and Influencing Factors of the Coal Bed Methane in Ⅱ-1 Coal Bed of Dengfeng Coalfield

通过对大量钻孔数据和生产矿井实测资料的综合分析,基本探明了登封煤田二1煤层煤层气(瓦斯)体积含量由南向北、由浅而深逐渐增大,按照煤层气体积含量的变化及其地质背景的差异分为两大类6个煤层气地质单元;认为煤层埋深、煤层厚度、地质构造、围岩和地下水是影响煤层气赋存的主要因素,其叠加效应增加了煤层气赋存的复杂性和不均衡性;在此基础上,确定了登封煤田煤层气的富集带和排泄区,对登封煤田二1煤层煤层气资源的开发选区提供了决策依据。

The systhetical analysis of the data of drill-holes and mines in Dengfeng Coalfield indicates that the content of the coal bed methane（CBM） increases from the south to the north with the increasing depth in the Ⅱ-1 coal bed. The CBM of Dengfeng Coalfield is divided into two categories including six geologic units according to the content of the CBM and the geologic backgrounds. This implies that several factors play important roles in the preservation of the CBM, which include the depth and thickness of the coal, the geologic structure, the nature of the wall rocks and the ground water. Their superposition gives rise to the complexity and unbalance in the preservation of the CBM. On this basis the bonanza and escaping zone of CBM is confirmed, which is significant for locating the development area of the CBM.