摘要
煤阶是煤层气的生成和煤的吸附能力的重要影响因素之一,对煤层气含量起控制作用。文章根据相 关文献中的吸附资料和实测数据,系统探讨了平衡水分下煤的吸附能力与煤阶的关系。指出随煤阶的增高煤的吸 附能力先后经历了4个阶段:快速增加阶段(Ro<1.3%)、缓慢增加阶段(Ro介于1.3%～2.5%)、达到极大值阶段 (Ro介于2.5%～4.0%)和降低阶段(Ro>4.0%)。这种变化与煤化作用跃变完全对应,煤化作用控制了煤的孔隙 度和表面物理化学性质,进而控制了煤层气的赋存空间和煤的亲甲烷能力。
Coal rank is one of the main factors of controlling coalbed methane formation and coal adsorption capacity, playing an important role in coalbed methane content. According to relevant literatures and measured data, the relation between coal rank and coal adsorption capacity at equilibrium water content is systematically discussed in the paper. It is pointed that the coal adsorption capacity experiences four stages with the rise of coal rank early or late, i.e. rapid increase stage (R°,°= 1.3%-2.5%), maximum stage (R° = 2.5% - 4.0%) and decrease stage (R°>4.0%). This change is fully corresponding to the coalification jump. The coalification controled the porosity and surface physicochemical property of coal, then controled the occurence space of coalbed methane and the coal's affinity for methane.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第1期19-21,共3页
Natural Gas Industry
基金
"973"国家重点基础研究发展规划项目"中国煤层气成藏机制及经济开采基础研究"(2002CB11700)资助~~
