石油科学通报2024，Vol.9Issue(2)：307-317,11.DOI:10.3969/j.issn.2096-1693.2024.02.022
页岩油注CO2重有机质沉积机理的分子模拟
Molecular simulation of the mechanism of heavy organic matter deposition during CO2 injection in shale oil reservoirs
摘要
Abstract
Heavy organic matter deposition risk during CO2 injection in shale oil reservoirs cannot be ignored.Clarifying the microscopic mechanism of heavy organic matter deposition during CO2 injection in shale oil reservoirs is the key to accurately predicting the risk of heavy organic matter deposition.The representative organic pore models were constructed based on the struc-tural characteristics of shale matrix nanopores.Equilibrium molecular dynamics(EMD)and grand canonical Monte Carlo(GCMC)simulation methods were adopted to investigate the storage mechanism and influencing factors of hydrocarbon components in shale nanopores and the effect of CO2 injection on the distribution of hydrocarbon components.The simulation results indicated that heavy hydrocarbon components were mainly distributed in the adsorbed state near the pore wall.Light components were mainly distributed in the central area of the pores as the free state in organic pores.CO2 extraction of light components in shale oil will destroy the stable structure of colloidal asphaltene.Heavy organic matter molecules will associate and deposit by the π-π stacking effect between aromatic cores and finally adsorb in nanopore walls of the shale matrix.In addition,CO2 injection can replace part of the adsorbed methane and ethane,and the microporous space in the kerogen matrix is the main space for CO2 geological storage.The research results reveal the microscopic mechanism of heavy organic matter deposition during CO2 injection in shale oil reservoirs.关键词
页岩油/注CO2/重有机质沉积机理/分子模拟Key words
shale oil/CO2 injection/mechanism of heavy organic matter deposition/molecular simulation分类
能源科技引用本文复制引用
黄世军,王鹏,赵凤兰..页岩油注CO2重有机质沉积机理的分子模拟[J].石油科学通报,2024,9(2):307-317,11.基金项目
国家自然科学基金面上项目(52174039、51974328)联合资助 （52174039、51974328）
