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广东江门地热水水文地球化学特征及来源分析

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林韵, 高磊, 李绍恒, 王卓微, 叶志平, 陈建耀, 杨志刚. 广东江门地热水水文地球化学特征及来源分析[J]. 环境化学, 2020, (2): 512-523. doi: 10.7524/j.issn.0254-6108.2019030606
引用本文: 林韵, 高磊, 李绍恒, 王卓微, 叶志平, 陈建耀, 杨志刚. 广东江门地热水水文地球化学特征及来源分析[J]. 环境化学, 2020, (2): 512-523. doi: 10.7524/j.issn.0254-6108.2019030606
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LIN Yun, GAO Lei, LI Shaoheng, WANG Zhuowei, YE Zhiping, CHEN Jianyao, YANG Zhigang. Hydrogeochemical characteristics and source identification of geothermal waters in Jiangmen, Guangdong Province[J]. Environmental Chemistry, 2020, (2): 512-523. doi: 10.7524/j.issn.0254-6108.2019030606
Citation: LIN Yun, GAO Lei, LI Shaoheng, WANG Zhuowei, YE Zhiping, CHEN Jianyao, YANG Zhigang. Hydrogeochemical characteristics and source identification of geothermal waters in Jiangmen, Guangdong Province[J]. Environmental Chemistry, 2020, (2): 512-523. doi: 10.7524/j.issn.0254-6108.2019030606
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广东江门地热水水文地球化学特征及来源分析

  • 1. 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州, 510275;

  • 2. 中国水利水电科学研究院, 北京, 100038

    • 通讯作者: 陈建耀, E-mail: chenjyao@mail.sysu.edu.cn ; 
  • 基金项目:

    国家自然科学基金（41771027，41701585，41611140112，41961144027），广东省自然科学基金（2017A030310309），亚太全球变化研究组织APN项目（CRRP2019-09MY-Onodera），中央高校基本业务费（17lgpy40）和广东省水利科技创新项目（2018年度）资助.

Hydrogeochemical characteristics and source identification of geothermal waters in Jiangmen, Guangdong Province

  • 1. Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, School of Geography and Planning, Sun Yat-sen University, Guangzhou, 510275, China;

  • 2. China Institute of Water Resources and Hydropower Research, Beijing, 100038, China

    • Corresponding author: CHEN Jianyao, chenjyao@mail.sysu.edu.cn ; 
  • Fund Project: Supported by the National Natural Science Foundation of China (41771027, 41701585, 41611140112, 41961144027), Natural Science Foundation of Guangdong Province (2017A0310309), Asia-Pacific Network for Global Change Research(CRRP2019-09MY-Onodera), Fundamental Business Fees of Central Universities (17lgpy40) and Water Science and Technology Innovation Project of Guangdong Province (2018).

  • 摘要: 粤西沿海地带地热资源丰富，探索其水文地球化学的特征有利于地热资源的保护和合理开发利用.本文以广东省江门地区为例，对该研究区地热水的水化学和稳定同位素（δD、δ18O）特征进行分析，并探讨该地热系统的水循环过程，包括补给源、补给高程、热储温度、循环深度等.结果表明，区域内热水温度为39.2-80℃，pH值为7.31-10.04，属于中低温偏碱性水；距海岸线从远到近将热水分成A、B、C组（A组约65 km，B组约30 km，C组约5 km），其TDS平均值（A组149.06 mg·L-1，B组765.78 mg·L-1，C组4322.23 mg·L-1）随着与海岸带距离的增加呈下降趋势，水化学类型从HCO3-Na型变为Cl-Na型；据Schoeller图、γNa/γ（Na+Cl）和Br/Cl比值推测，地热水上升过程可能受地表水、浅层地下水或者海水的混合作用；稳定同位素数据表明，地热水补给来源是大气降水，补给区为出露区附近的244-698 m的丘陵或山地，无明显的"氧漂移"现象，热储温度在83-197℃左右，循环深度约1.6-4.6 km，属于深循环对流型中低温地热系统，符合广东大部分已探明地热田的一般特征.
    Abstract: Geothermal resources are abundant among the coastal zone of western Guangdong Province. Studying the characteristics of geothermal resources will benefit better protection,development and utilization of geothermal resources. In order to study the characteristics of coastal geothermal systems, taking Jiangmen of Guangdong Province as an example, water samples were collected in April 2017, and January 2018, and stable hydrogen and oxygen isotopes and hydrochemical parameters were used to analyze the geothermal groundwater circulation processes, including recharge sources, recharge elevation, reservoir temperature and circulation depth, etc. All the geothermal waters in this region were alkaline water with low-to-moderate temperature ranging from 39.2 to 80℃ and pH ranging from 7.31 to 10.04. Three separated groups of geothermal waters, A, B and C were identified according to their respective distances of 65 km, 30 km and 5 km from the coastline. Average total dissolved solids (TDS) value of geothermal waters decreased with increasing distance from the coastline (TDS values were 149.06 mg·L-1 for group A, 765.78 mg·L-1 for group B, and 4322.23 mg·L-1 for group C, respectively), with the water type evolved from HCO3-Na to Cl-Na. In addition, Schoeller Graph, γNa/γ(Na+Cl) and Br/Cl ratios suggested that discharged geothermal waters might mix with surface water, shallow groundwater or seawater. Furthermore, the stable isotopes implied that geothermal spring waters originated from local meteoric water, and the recharge areas were found to be located at hills near the outcrop areas, with the altitude ranging from about 244-698 m above sea level. Reservoir source temperature was estimated to be 83-197℃ with a circulation depth of about 1.6-4.6 km, indicating mid-low temperature convective geothermal reservoirs with a deep cycle, similar to most of the exploited thermal fields in Guangdong Province.
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  • 收稿日期:  2019-03-06

广东江门地热水水文地球化学特征及来源分析

    通讯作者: 陈建耀, E-mail: chenjyao@mail.sysu.edu.cn ; 
  • 1. 中山大学地理科学与规划学院, 广东省城市化与地理环境空间模拟重点实验室, 广州, 510275;
  • 2. 中国水利水电科学研究院, 北京, 100038
  • 收稿日期:  2019-03-06
  • 网络出版日期:  2020-02-26
基金项目:

国家自然科学基金（41771027，41701585，41611140112，41961144027），广东省自然科学基金（2017A030310309），亚太全球变化研究组织APN项目（CRRP2019-09MY-Onodera），中央高校基本业务费（17lgpy40）和广东省水利科技创新项目（2018年度）资助.

摘要: 粤西沿海地带地热资源丰富，探索其水文地球化学的特征有利于地热资源的保护和合理开发利用.本文以广东省江门地区为例，对该研究区地热水的水化学和稳定同位素（δD、δ18O）特征进行分析，并探讨该地热系统的水循环过程，包括补给源、补给高程、热储温度、循环深度等.结果表明，区域内热水温度为39.2-80℃，pH值为7.31-10.04，属于中低温偏碱性水；距海岸线从远到近将热水分成A、B、C组（A组约65 km，B组约30 km，C组约5 km），其TDS平均值（A组149.06 mg·L-1，B组765.78 mg·L-1，C组4322.23 mg·L-1）随着与海岸带距离的增加呈下降趋势，水化学类型从HCO3-Na型变为Cl-Na型；据Schoeller图、γNa/γ（Na+Cl）和Br/Cl比值推测，地热水上升过程可能受地表水、浅层地下水或者海水的混合作用；稳定同位素数据表明，地热水补给来源是大气降水，补给区为出露区附近的244-698 m的丘陵或山地，无明显的"氧漂移"现象，热储温度在83-197℃左右，循环深度约1.6-4.6 km，属于深循环对流型中低温地热系统，符合广东大部分已探明地热田的一般特征.

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