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Volume and Surface Distribution Heterogeneity of Nano-pore in coal Samples by CO2 and N2 Adsorption Experiments

Acta Geologica Sinica(English Edition) 2020年第5期94卷 1662-1675页

作者： ZHANG Junjian WEI Chongtao LUO Jinhui LU Guanwen QUAN Fangkai ZHENG Kai PENG Yujie College of Earth Sciences&Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China School of Resources and Earth Science China University of Mining and TechnologyXuzhouJiangsu 221116China Construction Equipment College Guizhou Polytechnic of ConstructionGuiyang 551400China

In this paper,the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal *** following results were achieved.1)According to the results of volume and surface fractal dimension,meso-pores can be classified into Mep-1,Mep-2,and Mep-3,***-pore can be classified into Mip-1,Mip-2,and Mip-3,respectively.2)Pore types play an important role in affecting the heterogeneity of *** volume heterogeneity(VHY)of Mep-1 is simpler than that of Mep-2 and Mep-3 in type A ***,the VHY of Mep-1 becomes gradually larger than that of Mep-2 and Mep-3 from type A to type B and *** VHY of open pore in the same diameter is higher than that of semi-open or closed ***,the surface heterogeneity(SHY)of types A and B samples is significantly larger than that of type C,the SHY of semi-open or closed pores is more complicated than that of open pores.3)coal rank mainly affects the heterogeneity of *** heterogeneity of type A is always smaller than that of type B and *** VHY of Mip-1 is more complicated than that of Mip-2 and Mip-3 in the same samples,and the sensitivity of the VHY of Mip-1 and Mip-2 to the degree of coal rank is smaller than that of ***,the SHY of Mip-1 and Mip-2 is simpler than that of Mip-3 in the same sample,the SHY of micro-pores remains stable as the pore size decreases,and the affect of coalification level on SHY decreases with the decrease in pore ***-scale fractal characterization has enabled quantitative characterization of adsorption pore properties and provided useful information with regards to the similarity of pore features in different coal reservoirs.

关键词： pore volume and surface fractal dimension adsorption pore middle and high rank coal western Guizhou and eastern Yunnan area

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