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  

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

作　　者：姜哲 周训[1,2] 陈柄桦 陶广斌 李状 曹入文 隋丽嫒 JIANG Zhe;ZHOU Xun;CHEN Binghua;TAO Guangbin;LI Zhuang;CAO Ruwen;SUI Liai(School of Water Resources and Entironmenl,China University of Geosciences,Bejing 100083,China;MOE Key Laboralory of Grounduater Circulation and Entironmental Erolution,China Universily of Geosciences,Beijing 100083,China)

机构地区：[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

出　　处：《现代地质》2022年第4期1183-1192,共10页Geoscience

基　　金：国家自然科学基金项目(42172269,41772261)。

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SiO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。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 SiOgeothermometry, 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.

关 键 词：温泉 同位素 热储温度 Fix-Al方法 康定 

分 类 号：P641.3[天文地球—地质矿产勘探] P314.3[天文地球—地质学]