齐古断褶带中部煤层气储层特征及成藏模式研究

Study on Coal Bed Methane Reservoir Characteristics and Accumulation Model in the Middle of Qigu Fault-fold Belt

复杂的地质构造是影响准噶尔盆地南缘煤层气开发工作滞后的主要因素之一,为把握煤层气成藏模式具有小区域的独特性,立足于超过200 km2的齐古断褶带中段,根据其区域性构造特征、水文地质特征和煤岩煤质特征,结合相关单位的钻井、录井、煤样解析、等温吸附等数据和文献资料,分析评价了研究区煤层的储层特征对煤层气生、储的控制作用,并建立了煤层气区域性成藏模式,即单斜成藏模式和宽缓褶皱成藏模式。通过分析2种成藏模式的含气面积及对煤层气的封存能力,认为宽缓褶皱成藏模式要优于单斜成藏模式。

Complex geological structure of southern margin of Junggar Basin is one of the main factors affecting the coalbed methane（CBM） development work,in order to grasp the uniqueness of CBM accumulation pattern in small area,based on the middle Qigu fault fold belt of more than 200 km^2,according to its regional tectonic characteristics and hydro-geological characteristics and coal quality characteristics,combined with the related units of drilling,logging,and coal sample analysis,isothermal adsorption and other data and literatures,we analyze and evaluate reservoir characteristics of coal seams in the study area on the control function of production and storage of coalbed methane,and set up the regional accumulation pattern of coalbed methane,namely the homocline accumulation mode and broad and gentle fold accumulation mode.By analyzing gas bearing area and coalbed methane storage capacity from two kinds of accumulation patterns,we think that broad and gentle fold accumulation model is superior to homocline accumulation model.