文献类型：期刊文献

英文题名：Critical shifts of fluids in shale nanopores under confinement effects using a modified Redlich Kwong equation of state

作者：Zhou, Bo Wu, Xukun Li, Bobo Li, Jianhua

第一作者：Zhou, Bo;周波

通信作者：Zhou, B[1];Zhou, B[2];Zhou, B[3];Zhou, B[4]

机构：[1]Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China;[2]Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China;[3]Guizhou Univ, Coll Min, Guiyang 550025, Peoples R China;[4]Guizhou Inst Technol, Sch Min Engn, Guiyang 550025, Guizhou, Peoples R China

第一机构：Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China;corresponding author), Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China;corresponding author), Guizhou Univ, Coll Min, Guiyang 550025, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Min Engn, Guiyang 550025, Guizhou, Peoples R China.|贵州理工学院矿业工程学院;贵州理工学院;

年份：2026

卷号：16

期号：1

外文期刊名：SCIENTIFIC REPORTS

收录：;Scopus(收录号：2-s2.0-105033924884);WOS:【SCI-EXPANDED(收录号:WOS:001719793700017)】；

基金：This study was financially supported by the Guizhou Provincial Basic Research Program (Natural Science) (Qiankehe Platform Talents-YQK [2023]013 and Qiankehe Foundation QN [2025]044); the National Natural Science Foundation of China (Grant Nos. 52274183 and 52564021).

语种：英文

外文关键词：Shale; Fluid adsorption; Critical shift; Confined fluids; Modified RK-EOS

摘要：Shale oil or gas, as emerging focal points in current exploration and development activities, have garnered extensive attention from the global energy industry regarding their commercial exploitation. The widespread distribution of nano-scale pores and micro-scale fractures in shale reservoirs results in markedly heterogeneous and complex fluid distribution patterns and fluid properties within the reservoir. Accurate characterization of fluid phase behavior in shale reservoirs is crucial for optimizing exploration and development strategies. This study developed a modified RK equation of state (EOS) by incorporating the adsorbed layer thickness and reduced adsorption density to adjust the effective molar volume, which enables quantitative characterization of adsorption effects on critical temperature and pressure. Experimental and simulation data of critical temperature shift from literature were systematically collected to establish correlations between two correction coefficients and dimensionless pore diameter. Subsequently, the modified RK-EOS was solved, yielding analytical expressions for predicting critical property variations of confined fluids in nanopores. Finally, the evolution patterns of critical properties under different pore sizes were investigated. The results demonstrate that the modified RK-EOS model can accurately predict the influence of confinement effects on fluid critical properties, thereby providing a reliable theoretical foundation for numerical simulation of shale oil/gas reservoirs and optimization of development strategies.