江西宁都蓝田、遂川汤湖中温地热水特征与成因研究  

Characteristics and genesis of mesothermal geothermal water in Tanghu,Suichuan and Lantian,Ningdu,Jiangxi Province

作　　者：覃秋菊 刘金辉[1] 叶海龙 白细民 万平强 QIN Qiuju;LIU Jinhui;YE Hailong;BAI Ximin;WAN Pingqiang(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang,330013;Hydrogeology Brigade of Jiangxi Provincial Bureau of Geology,Nanchang,330224)

机构地区：[1]东华理工大学水资源与环境工程学院,南昌330013 [2]江西省地质局水文地质大队,南昌330224

出　　处：《地质论评》2025年第2期511-523,共13页Geological Review

基　　金：江西省重点研发计划“揭榜挂帅”项目(编号:20223BBG74005)的成果。

摘　　要：江西拥有丰富的水热型地热资源,其中宁都蓝田、遂川汤湖等地热水的水温较高,地表水温79~86℃,具有良好的开发利用潜力与远景。笔者等在总结前人研究成果及野外水文地球化学调查的基础上,分析了地热区地质、水文地质条件,开展了系统的地热水文地球化学、同位素地球化学等研究,对蓝田、汤湖中温地热水特征及其成因进行了较为深入的探讨。研究表明蓝田、汤湖地热水化学类型分别为SO_(4)^(2-)·HCO_(3)^(-)—Na^(+)型和HCO_(3)^(-)—Na^(+)型,其补给来源均为大气降水,补给高程分别为890~1100 m和1040~1220 m;地热水^(14)C年龄分别为16.17±0.14 ka和14.62±0.11 ka。SiO_(2)地热温标及地温梯度计算表明,地热水热储温度分别为146.32℃和133.79℃,循环深度分别为3258 m和2760 m。地热水属于大气降水入渗后,地下水温随地温梯度不断增温形成地下热水,热水再通过断裂上升,至地表形成地热水的大气降水深循环成因机制。研究成果对于深入揭示江西及其周边省份中温地热水成因机制具有十分重要的理论意义及较高的学术价值。Objectives:Jiangxi has abundant hydrothermal geothermal resources,and the highest water temperatures are found in the geothermal waters of Lantian,Ningdu and Tanghu,Suichuan,with surface water temperatures of 79~86℃,which have good potential and perspectives for development and utilization.In this paper,based on summarising the research results of the previous researchers and field hydrogeochemical investigations,analyzing the geological and hydrogeological conditions of the geothermal areas,and carrying out systematic geothermal hydrogeochemistry and isotope geochemistry studies,we have made a more in-depth discussion on the characteristics of the medium-temperature geothermal waters of Lantian and Tanghu,and the causes of the geothermal water in these areas.The study shows that the chemical types of geothermal water in Lantian and Tanghu are SO_(4)^(2-)—HCO_(3)^(-)—Na^(+)type and HCO_(3)^(-)—Na^(+)type respectively,and their recharge sources are atmospheric precipitation,with the recharge elevations of 890~1100 m and 1040~1220 m respectively;the ^(14)C ages of the geothermal water are 16.17±0.14 ka and 14.62±0.11 ka.The SiO_(2) geothermal temperature scale and geothermal gradient calculations show that the thermal storage temperature of geothermal water is 146.32℃and 133.79℃respectively,and the circulation depth is 3258 m and 2760 m.The geothermal water belongs to the atmospheric precipitation infiltration,the groundwater temperature increases with the geothermal temperature gradient to form underground hot water,and then hot water rises through the fracture to form the geothermal water on the surface of the atmospheric precipitation deep cycle genesis mechanism.The research results are of great theoretical significance and high academic value for revealing the genesis mechanism of mesothermal geothermal water in Jiangxi and its neighboring provinces.

关 键 词：中温地热水 水文地球化学 热储温度 循环深度 成因机制 

分 类 号：P31[天文地球—固体地球物理学]