摘要
为探讨石炭纪太原组灰岩孔隙结构,对淮北煤田涡北煤矿煤层底板L1—L4灰岩进行低温氮气吸附实验。基于FHH分形模型,拟合计算了灰岩孔隙分形维数,并分析了其与孔隙结构参数的关系。结果表明:太原组灰岩介孔孔容介于0.000 6~0.002 1 cm^(3)/g(平均值:0.010 3 cm^(3)/g),比表面积介于0.262~1.495 m^(2)/g(平均值:0.68m^(2)/g)。整体上,L1和L2灰岩孔容和比表面积数值上较为接近,而L3和L4灰岩可归为一类。灰岩低温氮气吸附曲线为Ⅳ型,回滞环属于H3型。孔径分布曲线呈多峰分布,主要区间为1~2 nm,3~4 nm和5~7 nm。灰岩孔隙分形维数D_(1)介于2.111 5~2.754 5,分形维数D_(2)为2.399 5~2.572 1,反映了太原组灰岩孔隙结构的非均质性程度较高。孔容、比表面积与分形维数D_(1)存在明显的线性负相关关系,而与分形维数D_2正相关。
In order to explore the pore structure of Carboniferous Taiyuan Formation limestone,the low temperature nitrogen adsorption experiments were carried out on L1~L4 limestone in Guobei coalmine from Huaibei Coalfield.On the basis of FHH fractal model,the pore fractal dimensions of limestone were fitted and calculated,and the relationship between fractal dimension and pore structure parameters was analyzed.Results show that the mesopore volume of the limestone ranges from 0.0006 to 0.0021 cm^(3)/g(Average value:0.0103 cm^(3)/g),and specific surface area is 0.262~1.495 m^(2)/g(Average value:0.68 m^(2)/g).On the whole,the pore volume and specific surface area of L1 and L2 limestone are relatively close in value,and those of L3 and L4 limestone can be classified into one category.The low temperature nitrogen adsorption curve of the limestone is type IV,and the hysteresis loop belongs to type H3.Multi-peaks are observed on the pore size distribution,and the main intervals are 1~2 nm,3~4 nm and 5~7 nm.The pore fractal dimension D_(1) ranges from 2.1115 to 2.7545,and the fractal dimension D_(2) is 2.3995~2.5721,which reflects the high degree of heterogeneity of pore structure of Taiyuan Formation limestone.The pore volume and specific surface area are linear negatively correlated with fractal dimension D_(1),but show positive correlation with fractal dimension D_(2).
作者
魏强
冯松宝
冯文青
崔福田
石从秋
WEI Qiang;FENG Songbao;FENG Wenqing;CUI Futian;SHI Congqiu(School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,China;National Coal Mine Water Disaster Prevention and Control Engineering Technology Research Center,Suzhou 234000,China)
出处
《宿州学院学报》
2021年第6期29-33,49,共6页
Journal of Suzhou University
基金
安徽省教育厅自然科学基金项目(KJ2020A0732)
两淮地区薄层灰岩识别技术研究(2020xhx029)
宿州学院博士科研启动基金项目(2019jb20)
国家级大学生创新创业训练计划项目(202010379010)
宿州学院专创融合课程建设项目(szxy2020zckc19)。
关键词
灰岩
介孔
孔隙结构
分形维数
涡北煤矿
Limestone
Mesopore
Pore structure
Fractal dimension
Guobei coalmine
作者简介
魏强(1989-),安徽濉溪人,博士,讲师,研究方向:煤及煤层气地球化学。
