晋城煤层气藏成藏机制  

Reservoir-Forming Mechanism of Coalbed Methane in Jincheng Anthracite

作　　者：王生维[1] 章泽军[2] 乌效鸣[3] 唐江林[1] 张典坤[1] 杨青雄[1] 韩兵[1] 刘旺博[1] 徐娅玲[2] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074 [2]中国地质大学地球科学学院,湖北武汉430074 [3]中国地质大学工程学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2008年第6期807-812,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目(No.40672099);国家"863"课题(No.2006AA06Z232);国家深部煤层项目(No.2006CB202204)

摘　　要：通过晋城煤层气的规模开发、压裂煤层气井的解剖、井下煤层瓦斯抽放、构造地应力场研究、煤储层大裂隙系统"CT"式解剖与煤层气封闭保存条件研究,发现3#煤储层内部存在大量煤层气包,构造微破裂作用促使煤层气包之间广泛合并联通,煤层气包内部储层的非均质性弱化,渗透率增加,煤层气包内部的游离气体比例增加,流体压力系统边界逐渐清晰并形成煤层气藏.揭示煤层气藏的成藏机制,认识煤层气藏的内部细节特征,促进了该区的煤层气开发技术进步,提高了井下煤层瓦斯的抽放效率.With the aim of studying reservoir-forming mechanism of coalbed methane （CBM） in the area of Jincheng, through the continuous development of coalbed methane in Jincheng, the dissection of fracturing coalhed methane wells, the extraction of underground coal seam gas, the study of tectonic stress field, the ＂CT＂-dissection of the fracture system of coal reservoir and the sutdy of dosed preservation conditions on coalbed methane, we found that there are a lot of CBM packages in 3^# coal reservoir and these CBM packages merge together because of micro-structural breakdown As a result, the heterogeneity of reservoir in CBM packages becomes weak; the permeability increases; the proportion of free gas increases in CBM package and the fluid pressure system gradually clears. Eventually, the above factors jointly contribute to the formation of the border of coalbed methane reservoir. The study on the accumulation mechanism of coalbed methane and the characteristics of the internal details of coalbed methane reservoir promotes the development of coalbed methane exploiting technology and improves the efficiency of extracting the underground coal seam gas.

关 键 词：晋城 煤层气成藏机制 构造微破裂作用 煤层气藏 煤层气包 

分 类 号：P618.11[天文地球—矿床学]