煤岩类型控制下的微观孔隙结构及吸附特征研究  

Study on microscopic pores structure and adsorption characteristics of different lithotypes

作　　者：刘玉龙[1,2] 汤达祯[1,2] 许浩[1,2] 赵俊龙[1,2] 刘彦飞[1,2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)煤层气开发利用国家工程研究中心煤储层实验室,北京100083

出　　处：《煤炭工程》2016年第11期107-110,共4页Coal Engineering

基　　金：大型油气田及煤层气开发国家科技重大专项(2016ZX05042-002);国家自然科学基金(41272175);中央高校基本科研业务费专项基金项目(2652015331)

摘　　要：为了深入研究煤储层微观孔隙结构及其吸附特征,选取了韩城矿区石炭系上统和二叠系下统的煤岩进行了低温二氧化碳吸附和液氮吸附/脱附实验,探讨了不同煤岩类型的微观孔隙结构,并在此基础上采用甲烷等温吸附技术,对比了不同煤岩类型的吸附特征。实验结果表明,煤岩类型不同,D-R比表面积和D-A总孔容不同,从暗淡煤到光亮煤随着镜质组含量的增加微孔含量变大,D-R比表面积和D-A总孔容呈现出增加的趋势,而中孔的BET比表面积和BJH总孔容则恰恰相反,因此,与微孔含量较高的光亮煤相比,微孔含量较低的暗煤吸附能力较差,半亮煤和半暗煤次之。就煤岩类型孔隙结构而言,光亮煤和半亮煤一般以一端封闭的Ⅰ型孔为主,半暗煤以Ⅱ型开放孔为主,而暗淡煤则以Ⅲ型墨水瓶孔为主。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 the adsorption characteristics of different lithotypes were compared. The experimental results show that with different lithotypes, the D-R specific surface area and the total pore volume of D-A are different. From the dull coal to the bright coal, the content of micropores increases with the increase of the content of 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 with low content of micropores have poorer adsorption capacities, 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 type Ⅱ, while the dull coal is the type Ⅲ of ink bottle pores.

关 键 词：煤岩类型 微观孔隙 二氧化碳吸附实验 吸附特征 

分 类 号：TD712[矿业工程—矿井通风与安全]