摘要：The adsorption of carbon dioxide and methane binary mixture in shale kerogen nanopores and the underlying mechanism significantly affect the supercritical carbon dioxide enhanced shale gas development project. In this study, we investigated the adsorption properties of carbon dioxide and methane in shale kerogen using grand canonical Monte Carlo (GCMC) method. Shale kerogen was fabricated based on Ungerer molecular model and its parameters were validated. The effects of temperature, pressure, mole fraction on the adsorption isotherms, average isosteric heat, potential energy distribution, and adsorption selectivity of binary mixture were discussed. The results show that the absolute adsorption capacity of methane in binary mixture decreases as temperature increases, but increases as mole fraction increases. Compared with methane, carbon dioxide is in lower energy absorption sites, which indicates the adsorption capacity of carbon dioxide in shale kerogen is stronger than that of methane. The adsorption selectivity of carbon dioxide over methane first decreases as pressure increases until pressure reaches critical pressure (7.38 MPa for carbon dioxide), and then stays at around 3.8 as pressure continues to rise. Adsorption selectivity and desorption quantity are used to reveal that the optimal injection depth for supercritical carbon dioxide enhanced shale gas development project is 1000–2500 m. This study will reveal the mechanism of the adsorption of methane in kerogen and provide some fundamental data for supercritical carbon dioxide enhanced shale gas development project.
© 2017 Elsevier B.V.

ISSN号：1875-5100

卷、期、页：v 50,p181-188

发表日期：2018-02-01

影响因子：2.718000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）,EI（工程索引）

发表期刊名称：Journal of Natural Gas Science and Engineering

通讯作者：王天宇

第一作者：田守嶒,李根生,盛茂

论文类型：期刊论文

论文概要：王天宇,田守嶒,李根生,盛茂，Selective adsorption of supercritical carbon dioxide and methane binary mixture in shale kerogen nanopores，Journal of Natural Gas Science and Engineering，2018，v 50,p181-188

论文题目：Selective adsorption of supercritical carbon dioxide and methane binary mixture in shale kerogen nanopores