中国地质2025，Vol.52Issue(2)：416-424,9.DOI:10.12029/gc20231121002
青海共和盆地干热岩人工储层示踪试验研究
Tracer test study on artificial reservoirs in hot dry rock geothermal systems in the Gonghe Basin,Qinghai
摘要
Abstract
This paper is the result of geothermal geological survey engineering. [Objective]Hot dry rock is a clean and vast geothermal resource.China Geological Survey has been continuously implementing China's first hot dry rock geothermal power generation and grid connection project in Gonghe,Qinghai since 2019.Hot dry rock reservoirs are dense and require fracturing to form a permeable interconnected fracture network,creating a reservoir capable of accommodating a certain scale of heat exchange and water conduction.However,research on artificial reservoirs in high-temperature hard rock is relatively limited.[Methods]The successful construction of artificial reservoirs and effective inter-well communication are the core of successful hot dry rock development.Tracer tests are an effective means to study the above issues and characterize reservoir hydrogeological conditions.This study focuses on the hot dry rock test site in the Gonghe Basin of Qinghai,selecting sodium fluorescein and sodium bromide as tracers,and conducting tracer tests before and after large-scale fracturing.[Results]Before large-scale fracturing,tracer recovery rate and heat exchange volume were relatively low.After the transformation,reservoir fractures became more complex,reservoir connectivity improved,and the tracer recovery rate reached 14.14%.The heat exchange volume of fractures increased to 27 times,and the fractures became relatively homogeneous,effectively reducing the risk of heat breakthrough.[Conclusions]Tracer experiments can quantitatively evaluate the effectiveness of hot dry rock artificial reservoir fracturing.The research results have guiding significance for the conduct of hot dry rock tracer tests and the scientific development of high-temperature hard rock thermal storage.关键词
干热岩/示踪试验/压裂改造/地热地质调查工程/共和盆地/青海Key words
hot dry rock/tracer test/fracturing remodeling/geothermal geological survey engineering/Gonghe Basin/Qinghai分类
地球科学引用本文复制引用
朱贵麟,邓志辉,刘东林,周殷竹,边超,曹月婷,冯庆达,张林友,许文豪,牛兆轩..青海共和盆地干热岩人工储层示踪试验研究[J].中国地质,2025,52(2):416-424,9.基金项目
中国地质调查局项目(DD20230018)和河北省水资源可持续利用与产业结构优化协同创新中心开放基金(SXTCX202402)联合资助. Supported by the project of China Geological Survey(No.DD20230018)and the Open Fund for Hebei Province Collaborative Innovation Center for Sustainable Utillization of Water Resources and Optimization of Industrial Structure(No.SXTCX202402). （DD20230018）
