海洋地质前沿2025，Vol.41Issue(3)：78-88,11.DOI:10.16028/j.1009-2722.2024.236
致密油藏含水条件下二氧化碳与短链烷烃竞争吸附特征的分子模拟
Molecular simulation of competitive adsorption of CO2 and short-chain alkanes under water containing conditions in tight oil reservoirs
摘要
Abstract
Tight reservoirs have low permeability,small porosity,and pervasive micro-nano pores,so water flooding has poor development effects.The use of CCUS-EOR(Carbon Capture,Utilization,and Storage-En-hanced Oil Recovery)technology can realize the geological sequestration of CO2 in the reservoir while improving the crude oil recovery efficiency.Currently,research on CO2 sequestration mechanisms focuses mainly on saline aquifer sequestration,with less emphasis on adsorption and sequestration during CO2 flooding in tight oil reser-voirs under water containing conditions.To address the above problems,we established a pore wall model for tight reservoirs using hydroxylated quartz cells based on molecular simulation methods,in which the fluid com-ponent models of CO2,crude oil short-chain alkanes,and water were contained;and investigated the competitive adsorption characteristics of CO2 and crude oil short-chain alkanes under water containing conditions.Results show that under water containing conditions,the adsorption isotherms of each component during the competitive adsorption of CO2 and CH4,CO2 and C2H6 were in accordance with the class I adsorption isotherm,and the abso-lute adsorption amount,excess adsorption amount,and heat adsorption of CO2 were larger than those of CH4 and C2H6.The adsorption of CO2 and crude oil short-chain alkanes on the quartz wall was physical.Under simulation conditions,the number of water molecules had a significant impact on the adsorption amount of CO2 and a relat-ively small impact on the adsorption amount of CH4.The increase in the proportion of CO2 increased CO2 adsorp-tion amount but decreased CH4 adsorption amount.The increase of temperature reduced the absolute adsorption amount of CO2 and CH4.The increase of pore size increased the absolute and excess adsorption amounts of both CO2 and CH4.The type of wall mineral showed a significant impact on the adsorption capacity of CO2 and CH4.关键词
致密油藏/CO2与短链烷烃/竞争吸附特征/分子模拟/吸附量Key words
tight oil reservoir/CO2 and short chain alkanes/competitive adsorption characteristics/molecular simulation/adsorption amount分类
石油、天然气工程引用本文复制引用
李静,崔传智,于涌博,李宗阳,张传宝,张东..致密油藏含水条件下二氧化碳与短链烷烃竞争吸附特征的分子模拟[J].海洋地质前沿,2025,41(3):78-88,11.基金项目
国家自然科学基金"致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法"(51974343) （51974343）
