煤层气生成及含气量控制因素

利用EASY%Ro数值模拟法,对峰峰东部矿区2号煤煤层热演化史进行模拟及恢复,探讨了峰峰东部矿区2号煤煤层气的生成和演化特点,认为峰峰东部矿区受构造运动及岩浆活动的影响,经历二次生气阶段,早期以区域深成变质作用为主,煤中有机质在深成变质作用下发生一次生气;晚期受岩浆活动的影响,促使该区的煤层进一步变质及煤层气第二次生成。在此基础上分析了研究区含气性及含气性的主要控制因素,包括煤储层顶底板岩性、分布特征、地质构造、岩浆侵入及水文地质条件等引起本区煤层甲烷含量在平面及剖面上分布的不均一性。

The coal- bed gas generation of the No. 2 coal in eastern Fengfeng and controlling factors on gas content

The numerical simulation method by EASY% Ro is used to simulate and reiterate the thermal evolution history of the No.2 coal mine in eastern Fengfeng,and the characteristics of the coal''s generation and evolution are discussed.The coal mine in eastern Fengfeng,which is influenced by the structure movement and the magmatic activity,is thought to experience two stages that the gas generated.In the early stage,it is mainly affected by the region plutonic metamorphism,and the organic matter of the coal is generated gas under the plutonic metamorphism function;while in the late stage,it is influenced by the magmatic activity,and the coal seam in the area is further deteriorated,then coal-seam gas is generated again.Accordingly,gas-bearing property and its major control factors in the research area are analyzed,such as the lithology of the coal reservoir roof and floor,the characteristics of the distribution,the geologic structure,the magmatic intrusion and the hydrogeological conditions and so on,which lead to uneven distribution of the methane content of the coal-seam in the plane and the section planes.