广东省龙门岩溶热储温度计算及流体演化特征  

Geothermometry Calculation and Geothermal Fluid Evolution of Karst Geothermal Reservoir in Longmen County,Guangdong Province

作　　者：王思佳[1] 张敏 黄学莲 韩永杰 何沛欣 王帅[3,4] 祁士华[1,3] Wang Sijia;Zhang Min;Huang Xuelian;Han Yongjie;He Peixin;Wang Shuai;Qi Shihua(State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China;Nonferrous Metals Geological Bureau of Guangdong Province 935 Battalion,Huizhou 516001,China;School of Environmental Studies,China University of Geosciences,Wuhan 430078,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430078 [2]广东省有色金属地质局九三五队,广东惠州516001 [3]中国地质大学环境学院,湖北武汉430078 [4]中国地质大学资源学院,湖北武汉430074

出　　处：《地球科学》2024年第3期992-1004,共13页Earth Science

基　　金：广东省有色金属地质局龙门县地热资源调查评价项目(No.ZZHZCG202004);珠江三角洲及周边地区控热地质构造调查研究项目(No.1212011220014)。

摘　　要：岩溶地热系统具有巨大的能源开发潜力,广东省龙门县马星和隔陂地热异常区是两个典型的岩溶地热田.为探究热储温度及流体演化特征,基于离子比值关系、氘氧同位素、地温计等方法对其进行分析讨论.结果表明研究区为中性偏碱性低TDS的HCO_(3)型地热水,方解石类碳酸盐矿物和硅酸盐矿物溶解及阳离子交换作用共同控制了水化学演化过程.大气降水是区内地热水的主要补给来源,马星和隔陂地热田的热储温度分别约为105.0~148.0℃和101.5~131.0℃,冷水混入的体积比约为44.2%和48.5%.在热储水化学及温度特征的基础上,建立了流体演化概念模型.Karst geothermal systems hold enormous potential for geothermal exploitation.The Maxing and Gepi geothermal anomaly areas are typical geothermal fields in Longmen County,Guangdong Province.The temperature and fluid evolution of geothermal reservoir can be clarified,with the analysis of ion ratio relationship,δD and δ^(18)O isotopes,and geothermal thermometers et.al.It is indicated that silicate minerals,carbonate minerals such as calcite dissolution,and accompanying cation exchange control the hydrochemistry evolution,thus forming slightly alkaline HCO_(3)-type geothermal water with lower TDS in the study area.The results suggest that atmospheric precipitation is the main recharge source.The reservoir temperature is 105.0-148.0℃ and 101.5-131.0℃ for Maxing and Gepi geothermal reservoir respectively,with a lower temperature during upwelling caused by mixing with cold water up to 44.2% and 48.5% dilution.In this case,a conceptual model for geothermal fluid evolution is proposed based on the geothermal water hydrochemistry and reservoir temperature characteristics.

关 键 词：岩溶地热水 水化学 热储温度 概念模型 地热能 

分 类 号：P314[天文地球—固体地球物理学]