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现代地质 ›› 2022, Vol. 36 ›› Issue (04): 1183-1192.DOI: 10.19657/j.geoscience.1000-8527.2022.04.20

• 地球化学与水资源 • 上一篇    

四川康定市二道桥地区地下热水稳定同位素特征及热储温度计算

姜哲1(), 周训1,2(), 陈柄桦1,2, 陶广斌1, 李状1, 曹入文1, 隋丽嫒1   

  1. 1.中国地质大学(北京) 水资源与环境学院,北京 100083
    2.中国地质大学(北京) 地下水循环与环境演化教育部重点实验室,北京 100083
  • 收稿日期:2021-09-02 修回日期:2022-01-10 出版日期:2022-08-10 发布日期:2022-09-09
  • 通讯作者: 周训
  • 作者简介:周训,男,教授,博士生导师,1963年出生,水文地质专业,从事地下热水 (温泉)、海岸带地下水、地下卤水 (盐泉)、矿泉水、地下水循环及其模拟等的研究。Email: zhouxun@cugb.edu.cn
    姜哲,男,硕士研究生,1997年出生,水文地质专业,主要从事水文地质学的研究。Email: 393819133@qq.com
  • 基金资助:
    国家自然科学基金项目(42172269);国家自然科学基金项目(41772261)

Stable Isotope Characteristics of Geothermal Water and Calculation of Geothermal Reservoir Temperature in the Erdaoqiao Area of Kangding in Sichuan Province

JIANG Zhe1(), ZHOU Xun1,2(), CHEN Binghua1,2, TAO Guangbin1, LI Zhuang1, CAO Ruwen1, SUI Liai1   

  1. 1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
    2. MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
  • Received:2021-09-02 Revised:2022-01-10 Online:2022-08-10 Published:2022-09-09
  • Contact: ZHOU Xun

摘要:

为研究四川省康定市二道桥地区地下热水稳定同位素特征和热储温度,对二道桥地区5个温泉(井)即二道桥温泉(SC107、SC107-2)、康巴人家温泉(SC107-3)、自流热水井(SC107-4)、自喷热水井(SC107-5)进行调查和分析。研究区温泉的分布及出露主要受雅拉沟断裂和雅拉河谷控制。温泉水温33.2~46 ℃,为中低温温泉,pH为6~6.5。水样的氢氧稳定同位素特征表明研究区地下热水的补给来源为大气降水。利用氢氧稳定同位素高程效应及温度效应估算区内地下热水补给区高程为3 000~4 500 m,补给区温度为-3.5~-0.3 ℃,表明地下热水有一部分补给源自附近山区的冰雪融水。Na-K-Mg三角图显示研究区热水均为未成熟水,不宜用阳离子地热温标计算热储温度。应用SiO2地热温标、多矿物饱和指数法以及用固定铝方法对部分温泉多矿物平衡图进行修正,得出研究区地下热水的热储温度为65~75 ℃。研究区温泉在东部跑马山以及西部农戈山附近接受大气降水补给,降水沿着大雪山—农戈山断裂和跑马山断裂下渗,地下水经历深循环,在此过程中获得大地热流加热,最终在雅拉河谷雅拉沟断裂附近出露成泉。

关键词: 温泉, 同位素, 热储温度, Fix-Al方法, 康定

Abstract:

In order to study the stable isotope characteristics of geothermal water and geothermal reservoir temperature in the Erdaoqiao area near Kangding in Sichuan, five hot springs including the Erdaoqiao hot springs (SC107 and SC107-2), Kangbarenjia hot spring (SC107-3), the flowing hot water well (SC107-4) and spouting hot water well (SC107-5) are investigated. The Yalagou fault and the Yala river valley control the occurrence of the hot springs in the study area. The water temperature of the hot springs in the study area ranges from 33.2 ℃ to 46 ℃, and pH value, from 6 to 6.5. The hot springs are of medium-low temperature. The stable isotope compositions of hydrogen and oxygen of the hot springs indicate that the hot water in the study area is of meteoric origin. Based on the altitude effect and temperature effect, the elevations of the recharge areas of the hot springs are estimated to be about 3 000-4 500 m, and the temperature of the recharge areas range from -3.5 ℃ to -0.3 ℃, indicating that the hot springs may be recharged partly by snow-melting water. The Na-K-Mg triangular diagram shows that the hot water in the study area is the unmature water, so it is impossible to calculate the temperature of geothermal reservoirs with the cation geothermometry. The temperature of the geothermal reservoir in the study area ranges from 65 ℃ to 75 ℃ by using the SiO2 geothermometry, multi-mineral saturation index method and Fix-Al method. The hot springs in the study area are recharged by precipitation and snow-melting water at the eastern part of the Paoma mountain and the western part of the Nongge mountain. The groundwater flows along the Daxue mountain-Nongge mountain fault and the Paoma mountain fault and undergoes a deep circulation. After heated by heat flow, the thermal groundwater rises and emerges as hot springs in the Yala River valley and near the Yalagou fault.

Key words: hot spring, isotope, temperature of a geothermal reservoir, Fix-Al method, Kangding

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