煤储层孔隙系统发育特征与煤层气可采性研究

Developing features of fissure system in Henan coal reserves seams and research on mining of coal bed methane

借助于低温氮等温吸附试验和压汞孔隙分析,研究了河南煤田主要矿区煤储层孔隙系统发育特征。研究发现河南煤储层孔隙系统具有如下特征:①煤储层的孔比表面及总孔体积均较大;②压汞孔隙度较大,孔隙结构以吸附孔占绝对优势,约占总孔隙含量的78%;③孔隙类型主要为细孔细喉型,渗流孔内部的连通性较好但渗流孔和吸附孔之间的连通性较差;④研究区的这种孔隙系统对煤层气的储集非常有利,但对煤层气的解吸和开发较为不利。

With the test of low temperature nitrogen isothermal adsorption and the analysis of pressurized mercury fissures, the paper studled the development features of the fissure system in the coal reserves seams of the main mining areaof Henan Coal Field. The study showed the following features of the fissure system in the coal reserves seams ：of Henan Coal Field.①The borehole special surface ratio and the total borehole volume in the coal reserves seams were large. ② The pressurized mercury fissures were high. The fissure structure and the adsorption borehole were in overwhelming superiority and were taking 78 % of the total fissure value. ③ The type of the fissures mainly ware fine holes with fine gullet. There Were good connections within the penetrated flow holes and there were less good connections between the penetrated flow holes and adsorption holes.④ The fissures system ion the study zone is favorable to the storage and collection of the coal bed methane, but not favorable to the adsorption and development of the coal bed methane.