岩矿测试2026，Vol.45Issue(3)：582-599,18.DOI:10.15898/j.ykcs.202507070194
万龙山断裂控制型地热系统水化学特征与成因机制
Hydrochemical Characteristics and Genetic Mechanism of the Wanlongshan Fault-Controlled Geothermal System
摘要
Abstract
The genetic mechanisms of medium-low temperature fault-controlled geothermal systems in the western Jiangxi region of South China are complex,where deep circulation pathways and reservoir structures remain poorly constrained,hindering the precise exploration and sustainable development of geothermal resources.The Wentang geothermal field,located in the central section of the Wanlongshan fault zone in the northern part of the Luoxiao Mountain Range,represents a key site for elucidating the genesis of such geothermal systems.In this work,a total of 12 water samples were collected from the Wentang geothermal field.Through integrated application of geological structural analysis,hydrochemical diagrams,stable isotope(H-O-Sr)tracing,and geothermometers,the recharge sources,circulation evolution,and reservoir characteristics of the geothermal fluids were investigated.The main findings are as follows:(1)Both the geothermal and cold waters in the study area are of meteoric origin.The geothermal water has undergone significant water-rock interactions during its flow path and has mixed with shallow cold water to varying degrees,with estimated mixing proportions ranging from 72%to 83%.(2)Based on quartz geothermometers,the deep reservoir temperature is estimated to be between 92.5℃and 101.1℃.The hydrochemical characteristics classify it as a medium-low temperature,weakly alkaline,HCO3-Na type water.(3)Comprehensive analysis reveals that the thermal reservoir structure is zonally distributed along the Wanlongshan fault zone,characterized as a fracture-pore composite reservoir with efficient heat conduction and accumulation capabilities.A genetic model for the fault-controlled geothermal system described as"precipitation infiltration-fault-controlled deep circulation-heat conduction and accumulation-mixing of cold and hot waters"is established.It elucidates the synergistic heat-controlling mechanism involving structure,lithology,and fluid,thereby providing a theoretical foundation for the exploration and development of similar geothermal resources in South China.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202507070194.关键词
万龙山断裂/温汤地热田/水化学/H-O-Sr同位素/热储结构/成因机制Key words
Wanlongshan Fault/Wentang geothermal field/hydrochemistry/H-O-Sr isotopes/thermal reservoir structure/genetic mechanism分类
天文与地球科学引用本文复制引用
张垚垚,刘凯,张寿川,王路瑶,贺晓龙,张栋,贾伍慧,王庆飞..万龙山断裂控制型地热系统水化学特征与成因机制[J].岩矿测试,2026,45(3):582-599,18.基金项目
地球深部探测与矿产资源勘查国家科技重大专项(2024ZD1004103,2025ZD1011107) （2024ZD1004103,2025ZD1011107）
中央财政基本科研业务费项目(JKY202511,JKY202406) （JKY202511,JKY202406）
湖南省自然科学基金青年项目(2023JJ40624) （2023JJ40624）
