沁水盆地南部郑庄区块高煤阶煤层气成藏模式

Model of high rank coalbed methane in Zhengzhuang block in the southern Qinshui Basin,China

为指导沁水盆地南部郑庄区块煤层气高效开发,通过综合运用钻井、地震、试井、煤岩测试及生产数据等资料,分析了研究区煤层气成藏条件和主控因素,并在此基础上研究了高煤阶煤层气成藏模式。研究发现,煤层气成藏主要受到构造、水文地质、地应力及煤变质作用控制。依据构造形态、煤层围岩和地下水动力等特征,把研究区煤层气藏划分为浅层单斜、鼻状构造、封闭断层气水圈闭及深层气藏等4种成藏模式。

In order to explain the rules of coalbed methane accumulation in Zhengzhuang Block of Qinshui Basin,the conditions and main controlling factors of the CBM accumulation in the study area were analyzed based on the data of drilling,logging,seismic,well testing,coal and rock testing and production. The conditions for CBM accumulation is mainly controlled by structure,hydrogeology and coal metamorphism. Based on the structural morphology,the surrounding rock and the dynamic characteristics of groundwater,the CBM reservoir in the study area is divided into four types of accumulation modes:shallow monocline,nasal structure,closed fault gas-water trap and syncline mode of deep coal seam,so as to guide the CBM development.