Numerical Simulation of CO2 Migration and Geochemical Reactions in Shihezi Formation Caprock, China

CO2 geological storage, which is an effective way to reduce CO2 emissions, is of great significance to mitigate the current greenhouse effect. In long-term CO2 storage, although the chemical reaction rate of CO2–brine–rock is slow, it can significantly change the mineral composition of rock and the...

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Bibliographic Details
Published in:Energies (Basel) 2023-01, Vol.16 (1), p.92
Main Authors: Li, Zhuo, Lv, Yanfang, Liu, Bin
Format: Article
Language:English
Subjects:
Brines
caprock
Carbon dioxide
Carbon dioxide fixation
carbon dioxide geological sequestration
Carbon sequestration
Chemical precipitation
Chemical reactions
CO2–saline–rock interaction
Coal
Emissions
Enhanced oil recovery
Geology
Greenhouse effect
heterogeneity
Intrusion
Mathematical models
Membrane permeability
Mineral composition
Normal distribution
Permeability
Porosity
Porous media
Risk assessment
Rocks
sealing ability
Simulation
Site selection
Transport processes
Two dimensional models
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Summary:CO2 geological storage, which is an effective way to reduce CO2 emissions, is of great significance to mitigate the current greenhouse effect. In long-term CO2 storage, although the chemical reaction rate of CO2–brine–rock is slow, it can significantly change the mineral composition of rock and the structure and properties of pores and joints, and then change the transport process and distribution state of CO2 in porous media. Therefore, a simplified 2D geological model is established based on the geological data of the Shihezi Formation in the Ordos Basin, China. The mechanism of the CO2–brine–rock reaction and its effect on mineral transformation and pore permeability are studied. In the early stage of CO2 geological sequestration, the rate of CO2 intrusion into the caprock is fast, the CO2–brine–rock reaction in the early stage is mainly a dissolution reaction, and the porosity and permeability of the caprock show an increasing trend. During the period from 100 to 1000 years of CO2 sequestration, the vertical distance of CO2 intrusion into the caprock does not change much. During this period, the type of CO2–brine–rock reaction is mainly a precipitation reaction, which reduces the porosity and permeability of the caprock and increases the sealing ability of the caprock to a certain extent. Our results can not only provide theoretical support for the site selection and risk assessment of CO2 geological sequestration, but also provide a theoretical basis and practical guidance for large-scale commercial storage in the future.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16010092