沁水盆地南部煤层气储层纳米级孔隙特征研究  

Study on Nanoscale Pore Characteristics of Coalbed Methane Reservoir in Southern of Qinshui Basin

作　　者：赵艳青[1] 潘结南[1] 白何领[1] 王海超[1] 姚利萍[1] 

机构地区：[1]河南理工大学资源与环境学院,河南焦作454000

出　　处：《煤矿安全》2013年第12期23-27,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41072153);中国科学院战略性先导科技专项资助项目(XDA05030100)

摘　　要：纳米级孔隙是煤储层吸附甲烷的主要场所,通过对沁水盆地南部4个矿区12个代表性煤样的液氮吸附实验,详细分析了煤的纳米级孔体积、比表面积、孔径分布及孔形结构等孔隙特征（1.5~100 nm）;并探讨了孔体积和比表面积与煤变质程度、显微组分和矿物质含量的关系。研究结果表明：煤中BJH孔体积为0.000 5~0.003 45 cm3/g,BET比表面积为0.196~2.654m2/g。煤样纳米级孔体积由过渡孔（10~100 nm）主导,而比表面积由亚微孔（1.5~5 nm）控制。实验煤样的吸附回线可以分为4类,根据吸附回线可将实验煤样的孔形结构分为半封闭孔、开放孔、细瓶颈孔。随变质程度增高,孔体积和比表面积均表现出先降低再增加的趋势;比表面积与镜质组含量存在微弱的正相关关系,而与矿物质含量的关系则相反。The nanoscale pores of coal are the main adsorption place for CH4. According to the liquid nitrogen adsorption experiment of12 coal samples in the southern of Qinshui basin,the volume,specific surface area,distribution and the shapes of the nanoscale pores（ 1. 5 ~100 nm） are determined. Furthermore,the variations of pore characteristics with rank,maceral composition and mineral have been investigated. The results showed that the BJH volume and BET surface area values are separately from 0. 000 5 to 0. 003 45 cm3/g and 0. 196 to 2. 654 m2/ g. The pore volume and the surface area are respectively controlled by transitional pores（ 10 to 100 nm） and sub-micropores（ 1. 5 to 5 nm）. According to the liquid nitrogen adsorption loops which can be divided four types,the pore shapes can be divided into open,semi-enclosed and fine bottleneck empty shapes. The volume and surface area decreases with the increasing of maturity,then increases with further increase of coal rank. A weak correlation does exist between specific surface area and vitrinite content and mineral content.

关 键 词：沁水盆地 煤 煤层气 纳米级孔隙 孔体积 比表面积 

分 类 号：TD712[矿业工程—矿井通风与安全]