Study on the Influence of Geological Parameters of CO[sub.2] Plume Geothermal Systems

At present, there are relatively few studies on the exploitation of geothermal resources in depleted high-temperature gas reservoirs with carbon dioxide (CO[sub.2]) as the heat-carrying medium. Taking the high-temperature gas reservoir of the Huangliu Formation in the Yingqiong Basin as the research...

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Bibliographic Details
Published in:Processes 2024-12, Vol.12 (12)
Main Authors: Song, Jifeng, Zheng, Huaan, Zhou, Yuxia, Liang, Yukai, Zeng, Qianyi, Fu, Meilong
Format: Article
Language:English
Subjects:
China
Comparative analysis
Electric properties
Geothermal resources
Simulation methods
South China Sea
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Summary:At present, there are relatively few studies on the exploitation of geothermal resources in depleted high-temperature gas reservoirs with carbon dioxide (CO[sub.2]) as the heat-carrying medium. Taking the high-temperature gas reservoir of the Huangliu Formation in the Yingqiong Basin as the research object, we construct an ideal thermal and storage coupling model of a CO[sub.2] plume geothermal system using COMSOL6.2 software to conduct a sensitivity analysis of geological parameters in the operation of a CO[sub.2] plume geothermal system. The simulation results show that, compared with medium- and low-temperature reservoirs, a high-temperature reservoir exhibits higher fluid temperature in the production well and a higher heat extraction rate owing to a higher initial reservoir temperature but has a shorter system operational lifetime; the influence of the thermal conductivity of a thermal reservoir on the CO[sub.2] plume geothermal system is relatively minor, being basically negligible; and the thinner the thermal reservoir is, the faster the fluid temperature in the production well decreases and the shorter the thermal breakthrough time. These findings form a basis for selecting heat extraction areas for CO[sub.2] plume geothermal systems and also provide a theoretical reference for future practical CO[sub.2] plume geothermal system projects.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr12122808