Adsorption of methane onto mudstones under supercritical conditions: Mechanisms, physical properties and thermodynamic parameters

作     者：Yang Wang Hong-Fei Cheng Qin-Hong Hu Lang-Bo Jia Xi-Meng Wang Sha-Sha Gao Luo-Fu Liu 

作者机构：School of Earth Science and ResourcesChang'an UniversityXi'anShaanxi710054China Key Laboratory of West Mineral Resources and Geological Engineering of Ministry of EducationChang'an UniversityXi'anShaanxi710054China Department of Earth and Environmental SciencesThe University of Texas at ArlingtonArlingtonTX76019USA Exploration and Development Research InstituteChangqing Oil FieldPetroChinaXi'anShaanxi710000China Department of Geology and GeophysicsTexas A&M UniversityCollege StationTX77843USA State Key Laboratory of Petroleum Resources and ProspectingChina University of Petroleum(Beijing)Beijing102249China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第1期

页      面：34-47页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0820[工学-石油与天然气工程] 0707[理学-海洋科学] 0817[工学-化学工程与技术] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0827[工学-核科学与技术] 0703[理学-化学] 0813[工学-建筑学] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 0814[工学-土木工程] 082002[工学-油气田开发工程] 

基　　金：This work was supported by the Natural Science Basic Research Program of Shaanxi[No.2022JQ-291 2021JQ-234] the China Postdoctoral Science Foundation[No.2021M692735] the Fundamental Research Funds for the Central Universities,Chang'an University[No.300102271305] 

主　　题：Supercritical methane adsorption Excess adsorption Adsorbed-phase density Adsorption model Thermodynamic feature 

摘      要：Since the mechanisms of methane-mudstone interactions are important for estimating shale gas reserves,methane adsorption under supercritical conditions of 30 MPa pressure and 303.15,333.15,363.15 K temperatures was studied to measure the excess methane adsorption in two mudstone samples from Yanchang Formation,Ordos *** adsorption features inflection points where the amount of adsorbed gas changes from increasing to decreasing *** methods(fixed,slope,and freely fitted density)were applied to calculate the adsorbed-phase density(rad),which was then used to fit the measured excess *** criteria,the goodness-of-fit and whether the fitting can obtain reasonable absolute adsorption,were applied to determine the most accurate *** indicated that the supercritical Dubinin-Radushkevich(SDR)model with freely fitted rad was the most reasonable *** volume of adsorbed methane at 363.15 K is close to the micropore(d2 nm)volume of the corresponding *** the actual geological conditions,the adsorbed gas should be predominantly stored in *** parameters reveal that the methane adsorption on mudstone is a physisorption process that is jointly controlled by the heterogeneity of,and interaction forces between the methane molecule and,the rock surface.