摘要
地下热水的地球化学特征能够揭示深部地热过程。萨嘎县如角乡嘎琼村地热资源丰富,但当前研究程度较低。为进一步查明如角地热显示区地热资源赋存状态及热源来源,揭示热循环机理,定量评估研究区热储温度,热循环深度等,利用如角地热显示区所采集水样进行水化学和氢氧同位素分析,进行定量计算,并分析如角地热显示区地下热水的演化过程。结果表明:如角地热显示区地下热水主要为HCO_(3)·Cl^(-)Na型水;地热水主要受大气降雨及冰雪融水补给,补给高度在海拔5501 m以上;利用温标计算出的热储温度为123.85℃,地热水热储循环深度约2000 m;显示区内热水中SiO_(2)、B、Na^(+)、HCO_(3)^(-)、TDS与Cl有较好的正相关关系,并且含量比较高。通过Cl含量相关图,也说明了工作区热水中可能有深部岩浆水混入,并且岩浆主要为地壳物质。通过水岩矿物平衡判断,水样基本为未成熟水,在热水上升至地表的过程中,受到大量浅层冷水的混合影响,从而导致采用地热温标法计算的热储温度存在一定偏差。
The geochemical characteristics of underground thermal water can reveal deep geothermal processes.Rujiao Town of Gaqiong Village,in Saga County is rich in geothermal resources,but the current research level is relatively low.In order to further ascertain the occurrence state of geothermal resources and heat source in the Rujiao geothermal active area,reveal the mechanism of thermal circulation,and quantitatively evaluate the geothermal reservoir temperature and the depth of thermal circulation,water samples were collected for hydrochemical and hydrogen-oxygen isotope analysis.Quantitative calculation was carried out,and the evolution process of underground thermal water in the study area was analyzed.The results show that:the underground thermal water in the Rujiao geothermal active area is mainly of the HCO_(3)·Cl^(-)Na type.The geothermal water is mainly replenished by atmospheric precipitation and ice-snow meltwater,with the replenishment altitude above 5,501.00 m.The geothermal reservoir temperature calculated by geothermometers is 123.85℃,and the circulation depth of the geothermal water in the thermal reservoir is approximately≥2,000m.There is a good positive correlation between SiO_(2),B,Na^(+),HCO_(3)^(-),TDS and Cl in the thermal water within theactive area,with relatively high content.The correlation diagram of Cl content also indicates that there may be deep magmatic water mixed into the thermal water in the study area,with the magma mainly originating from crustal materials.Judging from the water-rock mineral equilibrium,the water samples are basically immature water.During the ascent of thermal water to the surface,it is affected by the mixing of a large amount of shallow cold water,which leads to certain deviation in the geothermal reservoir temperature calculated by geothermometers.
作者
赵海华
官辉
赵小云
旦增国杰
郑亚东
格桑平措
班巴多吉
曾琪峰
张琳杰
Zhao Haihua;Guan Hui;Zhao Xiaoyun;Danzeng Guojie;Zheng Yadong;Gesang Pingcuo;Banba Duoji;Zeng Qifeng;Zhang Linjie(Geothermal and Geological Brigade,Geological and Mineral Exploration and Development Bureau,Xizang Autonomous Region,Lhasa 850032,China;School of Urban Geology and Engineering,Hebei GEO University,Shijiazhuang 050031,China;School of Water Resources and Environment,Hebei GEO University,Shijiazhuang 050031,China;School of Earth Science,Hebei GEO University,Shijiazhuang 050031,China)
出处
《西藏科技》
2025年第6期12-19,26,共9页
Xizang Science And Technology
基金
西藏自治区中央引导地方项目(XZ202201YD0029C)
西藏自治区重点研发计划项目(XZ202501ZR0146、XZ202501ZY0051、XZ202101ZY0008G、XZ202301ZY0042G、XZ202001ZR0044G)
西藏自治区自然科学基金项目(XZ2019ZRG-158)
国家自然科学基金(41502220)
自然资源部深地科学与探测技术实验室开放课题(SinoProbe Lab 202216)
关键词
萨嘎县
地热资源
水文地球化学
Saga County
Geothermal resources
Hydrogeochemistry
作者简介
第一作者:赵海华(1994-),男,青海西宁人,本科,工程师,主要研究方向为水文地质调查及地热地质调查工作。E-mail:1264893073@qq.com;通信作者:官辉(1974-),男,四川成都人,本科,高级工程师,主要研究方向为地质矿产、地热地质调查工作。E-mail:502605817@qq.com。
