煤田地质与勘探2024，Vol.52Issue(1)：83-92,10.DOI:10.12363/issn.1001-1986.23.09.0545
影响岩溶热储采出温度的开采参数敏感性研究
Sensitivity analysis of development parameters on the production temperature of karst geothermal reservoirs:A case study of the Qingfeng area in Henan,China
摘要
Abstract
The temperature of produced geothermal water serves as a pivotal indicator influencing the efficiency of geo-thermal energy utilization,with a higher temperature corresponding to more effective geothermal reservoir exploitation.For karst geothermal reservoirs,recognized as a significant type of geothermal reservoir,the temperature of produced geothermal water is influenced by reservoir parameters.Focusing on the Ordovician karst geothermal reservoirs in the Qingfeng area,Henan Province,this study established a geological model of the reservoirs,followed by numerical simu-lations based on thermal flow and well-reservoir coupling using the data of seven geothermal wells.The purpose is to explore the effects of the geological conditions and reinjection parameters of geothermal reservoirs on the temperature of produced geothermal water.The results reveal that the presence of faults accelerates the diffusion of moderate-low-tem-perature zones toward production wells,leading to an early thermal breakthrough.In the late stage of geothermal exploit-ation,the temperature of produced geothermal water was higher in the presence of faults,and its curve exhibited a high-er slope compared to the case where faults are absent.This result indicates that faults contribute to an elevated temperat-ure of produced geothermal water during thermal equilibrium in the Qingfeng area,ultimately conducive to an increase in extracted heat.Presently,it is generally considered that a smaller spacing between production and reinjection wells(also referred to as the well spacing)is associated with a lower temperature of produced geothermal water.However,in this study,the temperature of the produced geothermal water exhibited a rapid downward trend with increasing exploita-tion time under reinjection rates exceeding 50 kg/s.Most especially,the temperature under a well spacing of 835 m was even higher than that under a well spacing of 1 000 m.Finally,this study determined the optimal reinjection parameter combination for the specific scenario in the Qingfeng area,involving a reinjection temperature of 20℃,a reinjection rate of 50 kg/s,and a well spacing of 835 m.The results of this study will serve as a valuable guide for preparing schemes for the exploitation of karst geothermal reservoirs in the Qingfeng area or similar geological settings.关键词
岩溶热储/回灌参数/采出温度/耦合/断层/数值模拟Key words
karst geothermal reservoir/reinjection parameter/production temperature/coupling/fault/numerical simula-tion分类
天文与地球科学引用本文复制引用
韩昀,李克文,何继富,汪新伟,高楠安..影响岩溶热储采出温度的开采参数敏感性研究[J].煤田地质与勘探,2024,52(1):83-92,10.基金项目
雄安新区科技创新专项项目(2022XACX0800) （2022XACX0800）
