Safety Technology Branch, CCTEG China Coal Research Institute State Key Lab of Coal Mining and Clean
Utilization

为了掌握离柳矿区煤体孔隙结构对含气性的影响,基于压汞和液氮吸附试验对区内煤体孔隙结构的全孔径分布特征进行定量分析,并对孔隙结构表征参数与煤体吸附常数、渗透率进行线性拟合,结合理论分析阐明了孔隙结构对煤体含气性的影响,结果表明:微孔、过渡孔对煤体孔隙体积贡献率分别约为43%、44%,中孔、大孔的贡献率相对较低;微孔对孔隙比表面积贡献率高达71%,其次为过渡孔约27%,大孔仅占0.02%。微孔比表面积与瓦斯极限吸附量满足指数函数关系,且在煤体比表面积构成中占主导地位,控制着煤体的吸附气含量。中孔、大孔在孔隙体积方面贡献率仅为13%,对煤体游离气含量影响较弱,却与煤体渗透率存在一定正相关性,可作为游离气的渗流通道和存储空间。

In order to have the coal pore structure affected to the gas content in Liliu Mining Area, based on the mercury injection and liquid nitrogen adsorption tes t, a quantitative analysis was conducted on the full borehole diameter distribution features of the coal pore structure within the mining area. A linear ftting was conducte d on the pore structure characterized parameters with the coal adsorption constant and permeability. In combination with the theoretical analysis, the paper stated the p ore structure affected to the coal gas content. The result showed that the micro pore and transitional pore to the coal pore contribution rates would be 43% and 44% ind ividually and the medium and large pores to the contribution rate were relatively low. The micro pore to the contribution rate of the pore specific surface area was higher to 71%, then the transition pore was about 27% and the large pore was taken 0.02%. The specific surface area of the micro pore and the gas limit adsorption volume co uld meet the index function relationship. The coal specific surface area would be in a leading position of the composition and would control the coal adsorption content. The contribution rates of the medium pore and large pore would be 13% only, the influences to the coal free gas content was weak, but would have a certain positive co rrelation to the coal permeability and could be the seepage channel and storage space of the free gas.

国家科技重大专项资助项目(2016ZX05067-005)；国家自然科学基金资助项目(51604154)；