Construction design and potential analysis of enhanced geothermal system in the Guide Basin based on multi-objective optimization

BoWen HU, JiaJie YANG, ZhiWei YE, PeiBo LI, Wei LIANG, Rui SUN, Qi LIU

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 80-93.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 80-93. DOI: 10.6038/pg2025II0105

Construction design and potential analysis of enhanced geothermal system in the Guide Basin based on multi-objective optimization

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Abstract

The Guide Basin, as a vital target area for the development of Hot-Dry Rock (HDR) in China, necessitates an assessment of its exploitation potential and an investigation into the feasibility of constructing Enhanced Geothermal Systems (EGS). Therefore, this study focuses on the HDR geothermal development in the Guide Basin. Firstly, the location of objective reservoir is determined and the geometry of EGS is designed. After that, a thermal-hydraulic-mechanical coupling model for HDR development is established. The heat extraction performance of water-based EGS and carbon dioxide-based EGS under different injection rate, injection temperature and well spacing is compared, and the most suitable working fluid for EGS in the Guide Basin is determined through comprehensive analysis. Subsequently, the non-dominated sorting genetic algorithm III is used to conduct a multi-objective optimization for the EGS engineering parameters (injection flow rate, injection temperature, and well spacing) in the Guide Basin and the technique for order preference by similarity to ideal solution (TOPSIS) is used to sort the individuals in the Pareto fronts. Then the optimal parameter combination recommendation is given and provide a guidance for the EGS construction. Finally, based on the optimal parameter combination, the development potential, economic and environmental benefits of geothermal resources in the Guide Basin are evaluated. The research results indicate: (1) Carbon dioxide is more suitable as the working fluid for EGS in the Guide Basin due to its more stability production and lower consumption; (2) The optimal combination of engineering parameters for EGS in the Guide Basin is 59.48 kg/s, 20.26 ℃, and 379.95 m; (3) The EGS in the Guide Basin can operate stably for 50 years with an average electric power of 2.28 MW and a production temperature over 168 ℃, yielding a total electricity output of 1014 GWh. The levelized cost of energy is only 0.052 $/kWh, with a reduction in greenhouse gas emissions ranging from 0.34 to 1.18 Mt during this process.

Key words

Guide Basin / Hot-dry rock power generation / Supercritical carbon dioxide / Comparation analysis / Non-dominated sorting genetic algorithm Ⅲ / Multi-physical coupling

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BoWen HU , JiaJie YANG , ZhiWei YE , et al . Construction design and potential analysis of enhanced geothermal system in the Guide Basin based on multi-objective optimization[J]. Progress in Geophysics. 2025, 40(1): 80-93 https://doi.org/10.6038/pg2025II0105

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本文的优化算法代码由Yarpiz平台和Mostapha博士提供的开源程序改进而来(Heris,2016),在此表示感谢. 同时感谢审稿专家提出的宝贵意见和建议.

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