煤储层的气体解吸特性研究  

RESEARCH ON THE FEATURES OF GAS DESORPTION IN COAL RESERVOIR

作　　者：霍永忠[1] 

机构地区：[1]中联煤层气有限责任公司

出　　处：《天然气工业》2004年第5期24-26,共3页Natural Gas Industry

基　　金：国家重点基科研究发展规划项目 (2 0 0 2CB2 1170 8)资助

摘　　要：作者研究了气体在煤储层内的解吸特征 ,并分析了煤储层气体解吸特征与物质组成、煤阶和孔隙结构的关系。孔隙结构 (孔隙孔容、比表面积的分布与孔隙封闭性 )决定了压差在煤储层系统内的传递 ,微孔孔容和比表面积越大 ,压差越难以在煤储层内传递 ,进而降低气体解吸效率和解吸率 ;煤储层中镜质组含量的增加以及煤阶的增高 ,会在一定程度上导致储层中微孔孔容和比表面积的增加 ,因此 。The features of gas desorption in coal reservoir and their relation to the material composition,coal rank and pore structure are analyzed in the paper.The pressure transmission in coal reservoir system is dependent upon the pore structure(including the distributions of pore volume and specific surface area and the seal property of pores).The larger the micropore volume and specific surface area,the more difficult the pressure transmission in coal reservoir,thus reducing the gas desorption efficiency and desorption rate.The coal rank′s being heightened and the increase in vitrinite content in coal reservoir would lead to the increase in the micropore volume and specific surface area in the reservoir to a certain extent,so that the material composition and coal rank are the important factors affecting the gas desorption efficiency in coal reservoir.

关 键 词：煤储层 气体解吸特性 煤基质 微孔 气体解吸效率 解吸能力 储层 

分 类 号：P618.13[天文地球—矿床学]