我国焦煤煤层气资源潜力及其物性特征  

CBM resources potential and physical characteristics of coking coal in China

作　　者：张苗[1] 傅雪海[1] 王红冬 简阔[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]山西省地质矿产研究院,山西太原030000

出　　处：《煤田地质与勘探》2016年第2期39-45,共7页Coal Geology & Exploration

基　　金：山西省煤基重点科技攻关项目(2014012005)~~

摘　　要：我国2000 m以浅的焦煤煤层气资源量约1.214 7×1012 m3,占全国煤层气总资源量的3.3%,主要分布在华北、西北和西南等三大含气区。为了评价我国焦煤煤层气资源潜力,收集和测试了全国范围内的82件焦煤煤样的煤岩、煤质、工业分析、压汞实验和等温吸附实验数据,研究结果表明:随着煤化程度的增加,焦煤碳元素质量分数增加,而挥发分、氧元素和氢元素逐渐减小,且氧元素减少的速度大于氢元素;焦煤大孔、小孔和微孔较为发育,中孔发育较差;比表面积主要集中在小孔和微孔,大孔和中孔对比表面积的贡献甚微;焦煤孔隙度和总孔容与煤阶之间显示出"U"型关系,当1.20%<Rmax<1.40%时,焦煤的孔隙度和总孔容随着煤化程度的增加而减少,在Rmax=1.40%附近孔隙度和总孔容达到最低值,当1.40%<Rmax<1.70%,孔隙度和总孔容随着煤化程度的增加而增大;焦煤饱和吸附量平均约20.79 cm3/g,Langmuir压力随着煤化程度的增加而减小,Langmuir体积随着煤化程度的增加而增加。The estimated CBM resources of coking coal within the 2000 m nationwide are 1.214 7×1012m3, ac-counting for about 3.3% of the total CBM resources, and mainly distributed in North, Northwest and Southwest China. In order to evaluate the CBM resources potential of coking coal reservoirs, the data of coal petrography, properties, proximate analysis, mercury injection experiments and isothermal adsorption experiments of coking coal samples from main coking coal mining areas were collected or tested. The results indicated that the content of carbon increased and the content ofVdaf, oxygen and hydrogen decreased with the increasing coalification. The re-duced rate of oxygen was more rapid than that of hydrogen; The macropore, keyhole and micropore were developed better, mesopore was poorly developed; the specific surface was focused on keyhole and micropore. The porosity and the total pore volume of coking coal increased with coalification, showing relationship of “U” shape. When Rmaxvaried from 1.20% to 1.40%, the porosity and total pore volume decreased with the increasing coalification, While theRmaxvaried from 1.40% to 1.70%, the porosity and total pore volume increased; The average maximum adsorption capacity was about 20.79 cm3/g,PLdecreased with the increasing coalification, andVL increased with the increasing coalification.

关 键 词：煤层气 焦煤 孔径结构 孔隙度 吸附性 

分 类 号：P618.11[天文地球—矿床学]