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引用本文:章旭,郝红兵,刘康林,毛武林,肖尧,张文. 西藏沃卡地堑地下热水水文地球化学特征及其形成机制[J]. 中国地质, 2020, 47(6): 1702-1714.
ZHANG Xu,HAO Hongbing,LIU Kanglin,MAO Wulin,XIAO Yao,ZHANG Wen. Hydrogeochemical characteristics and genetic model of Oiga Graben geothermal waters system in Tibet[J]. Geology in China, 2020, 47(6): 1702-1714(in Chinese with English abstract).
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西藏沃卡地堑地下热水水文地球化学特征及其形成机制
章旭1, 郝红兵1, 刘康林1, 毛武林1, 肖尧1, 张文2
1.四川省地质矿产勘查开发局成都水文地质工程地质中心, 四川 成都 610081;2.中国地质科学院探矿工艺研究所, 四川 成都 611734
摘要:
通过沃卡地堑盆地地下热水水文地球化学特征研究,进行热储温度、补给高程计算,建立沃卡地堑地下热水系统中-高温地热概念模型。结果表明,沃卡温泉为中偏碱性水,溶解性总固体较低,水化学类型主要为SO4-Na型、SO4·Cl-Na型、HCO3·SO4-Na型。热水水文地球化学特征表明,沃卡盆地地下热水系统具有大气降水补给、浅循环地下水的特征,热水以深部熔融体为热源,受控于沃卡半隐伏控热断裂构造,但受裂隙潜水或地表冷水的混合作用,其Na-K-Mg平衡图表现为部分平衡或混合水。利用混合模型对热储真实温度进行估算,得到热储的温度范围为120~200℃,冷水混入比例为70%~83%。
关键词:  沃卡温泉  水文地球化学  形成机制  错那—沃卡裂谷  沃卡地堑  水文地质调查工程  西藏
DOI:10.12029/gc20200608
分类号:P314.1;P641.1
基金项目:中国地质调查局地质调查专项(121201019000161305)资助。
Hydrogeochemical characteristics and genetic model of Oiga Graben geothermal waters system in Tibet
ZHANG Xu1, HAO Hongbing1, LIU Kanglin1, MAO Wulin1, XIAO Yao1, ZHANG Wen2
1.Chengdu Center of Hydrogeology&Engineering Geology, Sichuan Bureau of Geology&Mineral Exploration&Development, Chengdu 610081, Sichuan, China;2.Institute of Exploration Technology, CAGS, Chengdu 611734, Sichuan, China
Abstract:
Based on the study of hot water hydrogeochemical characteristics of the Oiga Graben Geothermal Waters, the authors carried out hot water heat storage temperature and recharge elevation calculation, and established the Oiga Thermal Spring mediumhigh temperature geothermal concept model. The results show that the Oiga hot spring is of medium-alkaline water with low TDS, and the water chemical types are mainly SO4-Na type, SO4-Cl-Na type and HCO3- SO4-Na type. The hydrogeochemical characteristics of hot water indicate that the Oiga Springs are characterized by atmospheric rainfall recharge and shallow circulation groundwater in shallow geothermal systems. The hot water is heated by deep melting body and controlled by the Oiga semiinvisible controlled thermal fracture structure. but it is partially balanced or mixed with water in the Na-K-Mg triangle diagram due to the mixing effect by fissure diving or surface cold water. The mixed model is used to estimate the temperature before the influence of hot water and cold water mixing, the temperature range of the heat storage is 120-200℃, and the cold water mixing ratio is 70%-83%.
Key words:  Oiga hot spring  hydrogeochemistry  formation mechanism  Cona-Oiga rift  Oiga Graben  hydrogeological survey engineering  Tibet