关键词: 煤岩类型, 微观孔隙, 二氧化碳吸附实验, 吸附特征

Abstract: Abstract: In order to further study the microscopic pores structure and adsorption characteristics of coal reservoir, the coal samples in Hancheng mining area of Carboniferous Jurassic and Permian system are selected to conduct the low-temperature adsorption of carbon dioxide and nitrogen adsorption/desorption experiments and the microscopic pores structure of different lithotypes were discussed. On this basis, the methane isothermal adsorption technology was carried out and which would be compare the adsorption characteristics of different lithotypes. The experimental results show that because of the different lithotypes, the D-R specific surface area and the total pore volume of D-A aredifferent. From the dull coal to the bright coal, the content of micropores increases with the increase of the content of the vitrinite and the D-R specific surface area and total pore volume of D-A also show an increasing trend, but the BET specific surface area and the total pore volume of BJH trend show the opposite. Therefore, compared with the bright coal which have the high content of micropores, the dull coal that with the low content of micropores have the poor adsorption capacities, and followed by the semibright coal and the semidull coal. In terms of the pore structure of the different lithotypes , the bright coal and semibright coal are generally the type I which one end are closed, the semidull coal is mainly based on the open typeⅡ, while the dull coal is the typeⅢof "ink bottle pores"