摘要
以鲜水河地热带道孚地区为研究区,分析了研究区出露的8个地热水露头的水化学和氢氧同位素特征,计算了地热水的热储温度,探明了地热水的补给来源和补给高程。结果表明:研究区地热水的水化学类型以Na-Ca-HCO_(3)型和Ca-Na-HCO_(3)型为主,地热水中主要阴阳离子来源于硅酸盐矿物的溶解以及深部CO_(2)组分的加入;由于地热水为不饱和水,利用石英地热温标得出浅部地热水的热储温度为100~130℃,利用硅焓方程和硅焓图解得出初始地热水的热储温度为135~240℃和117~161℃(最大蒸汽损失),浅部冷水混合比例和蒸汽损失质量百分比分别为70%~85%和5%~12%;氢氧同位素证据显示,研究区地热水的补给来源为大气降水,补给高程为4159~5325 m。
This study concentrates on the hydrochemical andδD-δ18O characteristics of eight geothermal springs exposed in the Daofu area of the Xianshuihe geothermal belt,calculates the reservior temperature of geothermal waters,and determines the recharge source and elevation.The results reveal that Na-Ca-HCO_(3) and Ca-Na-HCO_(3) are the main hydrochemical types.The dissolution of silicate minerals with involvements of deep CO_(2) are the main factors controlling hydrochemical compositions of geothermal waters.Considering the immature affinity,the reservoir temperatures of shallow geothermal waters range from 100℃to 130℃calculated by quartz geothermometer.Reservoir temperatures of initial geothermal waters have a range of 135-240℃and 117-161℃with cold water mixing ratio of 70%-85%and vapor loss ratio of 5%-12%using silica-enthalpy formula and diagram.δD-δ18O values indicate the recharge source from precipitation with the elevation of 4159-5325 m.
作者
张云辉
李晓
许模
多吉
巫锡勇
肖勇
黄珣
ZHANG Yunhui;LI Xiao;XU Mo;DUO Ji;WU Xiyong;XIAO Yong;HUANG Xun(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;State Key Laboratory of Geological Disaster Prevention and Environmental Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2021年第3期42-51,共10页
Safety and Environmental Engineering
基金
国家自然科学基金项目(42072313)
中央高校基本科研业务费专项项目(2682020CX10)。
关键词
道孚地区
鲜水河地热带
地热水
水文地球化学
氢氧同位素
热储温度
补给来源
Daofu area
Xianshuhe geothermal belt
geothermal water
hydrogeochemistry
hydrogen and oxygen isotope
reservoir temperature
recharge source
