Key Laboratory of Coalbed Methane Resource and Reservoir Formation History, Ministry of Education, China
University of Mining &Technology Faculty of Earth Resources, China University of Geosciences (Wuhan)

基于低温氮吸附试验,从吸附-脱附曲线形态、孔径分布和FHH分形特征等方面分析了新疆和什托洛盖盆地西山窑组低阶煤孔隙结构特征,并从镜质体反射率、煤岩显微组分、工业分析组分方面探讨了煤孔隙结构与煤质之间的关系。结果表明:孔隙类型以微孔和小孔为主,孔隙形态多以"墨水瓶"状孔和开放型孔为主,存在少量一端封闭型孔;孔隙分形维数越大,孔隙比表面积和孔容越大,平均孔径越小,孔隙系统越趋于复杂;孔容和BET比表面积随惰质组含量增加而增大,随镜质组含量增加而减小,二者与矿物质含量关系整体呈不对称的"V"字形,在矿物质含量为1%处转折。此外,镜质组反射率、水分和灰分的增加,降低了孔容和BET比表面积。

Based on the cryogenic nitrogen adsorption experiment, the pore structure in Xishanyao Formation low rank coal in Hoxtolgay Basin were analyzed from the morphologic character of nitrogen adsorption-desorption curve, the distribution curve of pore diameter and the FHH fractal feature. The relation between pore struct ure and quality of the low rank coal was investigated from the aspects of coal vitrinite reflectance, coal petrography-maceral and coal industry analysis. The results indi cate that the micropore and minipore are the primary pore types and the majority of them show typical shapes of“ink bottle' and open, only few are“one-closed end" por es. The pores are more complicated with the increasing of fractal dimension as well as BET specific surface area and pore volume, the decreasing of average pore dia meter. The pore volume and BET specific surface area of coal samples grow with the increasing of inertinite contents and decreasing of vitrinite content. Both the pore volume and BET show asymmetric“V" shape tendency with the mineral contents with the turning point at the 1% of mineral contents. Besides, the increasing of vitrinite 「 eflectance, moisture content and ash yield would decrease the pore volume and BET specific surface area of coal samples.

国家科技重大专项资助项目(2011ZX05033-01-08)；国家自然科学基金重点资助项目(U1361207)；