基于多目标优化的贵德盆地增强型地热系统设计与潜力分析  

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

作　　者：胡波文 羊嘉杰 叶志伟 李培博 梁伟[1] 孙锐 刘奇 HU BoWen;YANG JiaJie;YE ZhiWei;LI PeiBo;LIANG Wei;SUN Rui;LIU Qi(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454003,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学,深地工程智能建造与健康运维全国重点实验室,徐州221116 [2]河南理工大学资源环境学院,焦作454003 [3]中国矿业大学力学与土木工程学院,徐州221116

出　　处：《地球物理学进展》2025年第1期80-93,共14页Progress in Geophysics

基　　金：国家自然科学基金项目(42307238);江苏省卓越博士后计划项目(2023ZB602);中国博士后科学基金项目(2023M733773)联合资助.

摘　　要：贵德盆地作为我国干热岩开发重要靶区,需进行开采潜力评估以及增强型地热系统(EGS)建造可行性探究.因此本文以贵德盆地干热岩储层为研究对象,建立了热-流-固耦合数值模型,对比了水基和二氧化碳基增强型地热系统在不同注入流量、注入温度和井间距条件下的采热表现,选定了适合贵德盆地的工作流体.随后利用第三代非支配排序遗传算法对贵德盆地EGS工程参数(注入流量、注入温度和井间距)进行了多目标优化并利用优劣解法对Pareto前沿中的个体进行排序,确定了最优参数组合建议并为贵德盆地EGS建造提供了参考.最后基于最优参数组合,评估了贵德盆地干热岩开发潜力以及经济和环境效益.研究结果表明:(1)二氧化碳因其较稳定的生产和较低的功耗而更适合作为贵德盆地EGS的工作流体;(2)贵德盆地EGS工程参数最优组合为:注入流量59.48 kg/s,注入温度20.26℃和井间距379.95 m;(3)贵德盆地EGS能以2.28 M_(W)的平均发电功率及高于168℃的生产温度稳定运行50年,产出电量总计为1014 GWh,单位电量成本仅为0.052$/kWh,可减少温室气体排放量达0.34~1.18 Mt.The Guide Basin,as a vital target area for the development of Hot-Dry Rock(HDR)in China,necessitates an assessment of its exploitation potential and an investigation into the feasibility of constructing Enhanced Geothermal Systems(EGS).Therefore,this study focuses on the HDR geothermal development in the Guide Basin.Firstly,the location of objective reservoir is determined and the geometry of EGS is designed.After that,a thermal-hydraulic-mechanical coupling model for HDR development is established.The heat extraction performance of water-based EGS and carbon dioxide-based EGS under different injection rate,injection temperature and well spacing is compared,and the most suitable working fluid for EGS in the Guide Basin is determined through comprehensive analysis.Subsequently,the non-dominated sorting genetic algorithm III is used to conduct a multi-objective optimization for the EGS engineering parameters(injection flow rate,injection temperature,and well spacing)in the Guide Basin and the technique for order preference by similarity to ideal solution(TOPSIS)is used to sort the individuals in the Pareto fronts.Then the optimal parameter combination recommendation is given and provide a guidance for the EGS construction.Finally,based on the optimal parameter combination,the development potential,economic and environmental benefits of geothermal resources in the Guide Basin are evaluated.The research results indicate:(1)Carbon dioxide is more suitable as the working fluid for EGS in the Guide Basin due to its more stability production and lower consumption;(2)The optimal combination of engineering parameters for EGS in the Guide Basin is 59.48 kg/s,20.26℃,and 379.95 m;(3)The EGS in the Guide Basin can operate stably for 50 years with an average electric power of 2.28 M_(W) and a production temperature over 168℃,yielding a total electricity output of 1014 GWh.The levelized cost of energy is only 0.052$/kWh,with a reduction in greenhouse gas emissions ranging from 0.34 to 1.18 Mt during this process.

关 键 词：贵德盆地 干热岩发电 超临界二氧化碳 对比分析 非支配排序遗传算法 多物理场耦合 

分 类 号：P314[天文地球—固体地球物理学]