Molecular simulation of competitive adsorption of CO<sub>2</sub> and short-chain alkanes under water containing conditions in tight oil reservoirs

LI Jing; CUI Chuanzhi; YU Yongbo; LI Zongyang; ZHANG Chuanbao; ZHANG Dong

doi:10.16028/j.1009-2722.2024.236

2025 Vol. 41, No. 3

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Article navigation > Marine Geology Frontiers > 2025 > 41(3): 78-88

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LI Jing, CUI Chuanzhi, YU Yongbo, LI Zongyang, ZHANG Chuanbao, ZHANG Dong. Molecular simulation of competitive adsorption of CO2 and short-chain alkanes under water containing conditions in tight oil reservoirs[J]. Marine Geology Frontiers, 2025, 41(3): 78-88. doi: 10.16028/j.1009-2722.2024.236

Citation:

LI Jing, CUI Chuanzhi, YU Yongbo, LI Zongyang, ZHANG Chuanbao, ZHANG Dong. Molecular simulation of competitive adsorption of CO₂ and short-chain alkanes under water containing conditions in tight oil reservoirs[J]. Marine Geology Frontiers, 2025, 41(3): 78-88. doi: 10.16028/j.1009-2722.2024.236

Molecular simulation of competitive adsorption of CO₂ and short-chain alkanes under water containing conditions in tight oil reservoirs

1.
College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
2.
National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
3.
Qingdao Key Laboratory of Offshore CO₂ Geological Storage, Qingdao 266237, China
4.
Qingdao Engineering Research Center of Offshore CO₂ Geological Storage, Qingdao 266237, China
5.
Shandong Engineering Research Center of Offshore CO₂ Geological Storage, Qingdao 266237, China
6.
Exploration and Development Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

More Information

Corresponding author: CUI Chuanzhi, ccz2008@126.com

Received Date: 11 October 2024

Publish Date: 28 March 2025

Abstract

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-Enhanced 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 reservoirs 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 component 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 absolute 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 relatively small impact on the adsorption amount of CH₄. The increase in the proportion of CO₂ increased CO₂ adsorption 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.
- tight oil reservoir /
- CO₂ and short chain alkanes /
- competitive adsorption characteristics /
- molecular simulation /
- adsorption amount

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