摘要
贵阳市地热资源丰富,在区内先后勘查和开发了10多处地热井。目前在贵阳市还未系统地开展过地热水来源以及水文地球化学特征方面的研究,存在地热水热储温度、补给区域、补给来源不清等问题。在充分了解地热地质条件的基础上,对双龙航空港经济区老街地热采集了水样进行水化学全分析和氢氧同位素测试,根据老街地热的水化学特征和同位素特征,分析出地热水的补给来源,估算了地热水的热储温度、循环深度、补给高程、补给温度以及冷水混入比例。结果表明,水化学类型主要为SO_(4)·HCO_(3)-Ca·Mg,有益元素主要有F^(-)、Sr^(2+)、偏硅酸;地热水所处的地质环境相对封闭,滞留时间较长;在未受浅部地下水混合前的深部热储温度达100℃,地热水在上升过程中冷水混入比例为60%。同位素分析结果显示,地热水补给源为非现代大气降水,补给区为高程1350 m的百花湖森林公园一带,补给时的年平均水温为3.99℃。
Guiyang is rich in geothermal resources,more than 10 geothermal wells have been explored and developed in the region.At present,there is no systematic research on geothermal water sources and hydrological geochemistry characteristics in Guiyang.There are problems such as geothermal water storage temperature,recharge region and unclear recharge sources.On the basis of a full understanding of the geothermal geological condition,water samples collected from Laojie geothermal field in Shuanglong Airport Economic Zone are subjected to complete hydrochemical analysis and hydrogen and oxygen isotope testing,the recharge source of geothermal water is analyzed,and the temperature of thermal storage,the depth of circulation,the recharge elevation,the recharge temperature and the mixing ratio of cold water are estimated.The result shows that the main hydrochemical type is SO_(4)·HCO_(3)-Ca·Mg,and the beneficial elements are F^(-),Sr^(2+)and metasilicate acid.The geological environment where geothermal water is located is relatively closed and its residence time is long.The temperature of the deep thermal reservoir reaches 100℃before mixing with the shallow groundwater,and the ratio of cold water to geothermal water is 60%during the rising process.The isotope analysis results show that the geothermal water is supplied by non-modern precipitation,and the recharge area is Baihua Lake Forest Park at an altitude of 1350 m,with an average annual water temperature of 3.99℃.
作者
田超
杜蔺
黄凯平
郑明泓
肖宪国
TIAN Chao;DU Lin;HUANG Kaiping;ZHENG Minghong;XIAO Xianguo(The Seventh Team of Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,Guizhou,China;Geological and Mineral Exploration Institute,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,Guizhou,China;Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,Guizhou,China)
出处
《矿产与地质》
2023年第3期617-625,共9页
Mineral Resources and Geology
基金
贵州省有色金属和核工业地质勘查局七总队“贵州省贵阳市双龙航空港经济区老街地热水勘查”(编号:202112-15)项目资助。
关键词
地热水
水化学特征
同位素特征
补给来源
geothermal water
hydrochemical feature
isotopic characteristics
recharge sources