新疆阜康白杨河矿区煤层气成藏条件及控藏效应

Conditions of creating CBM reservoir and effect of controlling CBM reservoir in Baiyanghe mining area,Fukang of Xinjiang Uighur Autonomous Region

通过对矿区地质条件的研究,分析了沉积作用、构造动力条件、变质作用、煤层自燃及水文地质条件对矿区煤层气富集成藏的控制与影响。沉积作用、构造动力条件为煤层气藏的形成创造了较好的生气层、储集层和盖层;构造活动对储层破坏程度较小,并进一步改善了储层的渗透性能;在煤变质初期阶段及受煤层自燃的影响,煤层生气量大;矿区水动力条件较差,不利于煤层气运移与扩散,使得煤层气富集成藏。

Through studying on geological conditions of the mining area,sedimentation,tectonic dynamic condition,metamorphism,spon-taneous combustion of coal seam and hydrogeology conditions on the control and influence of CBM rich reservoir in the mining area were analyzed.Sedimentation and tectonic dynamic condition has created good gas forming layer,reservoir layer and overlying layers.The influencing of tectonic activity on the reservoir is smaller,and it has improved the permeability of the reservoir.The quantity of gas generating was large in early stage of coal metamorphism due to the spontaneous combustion of the coal seam,and the hydrodynamic condition in mining area is poor,it is not conducive to migration and diffusion of CBM,and has created CBM reservoir.