Study of CH_(4)and CO_(2)competitive adsorption on shale in Yibin,Sichuan Province of China  

作　　者：Yue Ma Changtao Yue Shuyuan Li Xinyi Xu Yue Niu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of Science,China University of Petroleum,Beijing 102249,China

出　　处：《Carbon Resources Conversion》2019年第1期35-42,共8页碳资源转化（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(No.41372152);the National Basic Research Program of China(973 Program,2014CB744302).

摘　　要：Shale gas is an unconventional gas source with substantial development potential.In this study,Longmaxi Formation shale from the Silurian system in Yibin,Sichuan Province was collected for characterizing total organic carbon(TOC),clay mineral content,and other reservoir properties.The pore structure of shale was analyzed by field-emission scanning electron microscopy and low-temperature N_(2) adsorption–desorption method.Isothermal adsorption experiments for CH_(4)and CO_(2)mixtures in shale samples were performed.The second Virial coefficient was used to calculate for the compressibility factor of the gas mixture.The influencing factors of gas adsorption capacity of shale were analyzed.Finally,the CH_(4)and CO_(2)adsorption capacities and selection of shale samples were investigated.Under low pressure,the total gas mixture capacity of shale samples was positively correlated with pressure.When the pressure increased to a certain extent,the growth trend of gas mixture adsorption capacity of shale samples decreased.The mixed gas adsorption volume is high at 50℃ for all the proportion.Given the same temperature and pressure,the CO_(2)adsorption of shale samples is higher than the CH_(4)adsorption.In competitive adsorption,shale prefers to adsorb CO_(2).Therefore,CO_(2)is easier to be adsorbed by shale and this causes CH_(4)to be released from the adsorption site.

关 键 词：CH_(4) CO_(2) Competitive adsorption Second Virial coefficient 

分 类 号：F42[经济管理—产业经济]