谷露地热田水文地球化学特征  

Hydrogeochemical Characteristics of Gulu Geothermal Field

作　　者：郝伟林[1] 谢迎春 周鹏 张松[1] 孙国强 刘军 蒋执俊 徐海洲 HAO Weilin;XIE Yingchun;ZHOU Peng;ZHANG Song;SUN Guoqiang;LIU Jun;JIANG Zhijun;XU Haizhou(CNNC Geothermal Exploration Technology Center,Beijing Research Institute of Uranium Geology,Beijing 100029,China;CNNC Kunhua Energy Development Co.,Ltd.,Hangzhou,Zhejiang 311113,China;Geothermal Geological Brigade,Bureau of Mineral and Resource of Tibet,Lhasa,Tibet 850032,China)

机构地区：[1]核工业北京地质研究院中核集团地热勘查技术研究中心,北京100029 [2]中核坤华能源发展有限公司,浙江杭州311113 [3]西藏自治区地质矿产勘查开发局地热地质大队,西藏拉萨850032

出　　处：《世界核地质科学》2022年第2期321-329,共9页World Nuclear Geoscience

基　　金：中核集团集中研发项目“地热勘查开发利用关键技术研究(编号:中核科发[2019]419号)”。

摘　　要：在地热田勘查阶段,地热田水化学特征分析可以提供地下水来源、热异常分布和深部热储温度等信息,为地热田勘查及选区提供水文地质依据。通过分析水文地质条件和水文地球化学特征,认为谷露地热田具有完整的地下水补-径-排体系,热水来源于西侧念青唐古拉山的雨水和冰雪融水,由西侧山前深大构造运移至深部,经加热,储集于构造破碎带和基岩风化壳中。地下热水中Cl、F、Si、Li和Cs等热流体特有组分浓度较高,表明其具有深循环的特征。热水的水化学类型为HCO_(3)·Cl-Na或Cl·HCO_(3)-Na型,矿化度介于2.2~2.9g·L^(-1)之间,氯化物型热水指示了深部热流体的主要通道。采用SiO_(2)石英温标、Na-K温标和K-Mg温标分别计算了深部热储温度,认为谷露地热田浅层热储温度介于180~206℃之间,深部热储温度介于215~228℃之间。In the exploration stage of geothermal field,the analysis of hydrochemical characteristics of geothermal fields can provide information of groundwater sources,distribution of thermal anomaly and reservoir temperature,and provide hydrogeological evidence for geothermal resources exploration and selection.Through the analysis of hydrogeological conditions and hydrogeochemical characteristics,this paper holds that Gulu geothermal field has a complete groundwater recharge,runoff and discharge system,the hot water comes from the rain and melting snow on the west side of Nyainqentanglha,it migrates to and heated in the deep through the structure,move upward and stored in the structural fracture zone and weathering crust of bedrock.The concentration of specific components in the geothermal fluid such as Cl,F,Si,Li and Cs is higher in the geothermal water,indicating that it has the characteristics of deep circulation.The hydrochemical type of hot water is HCO_(3)·Cl-Na or Cl·HCO_(3)-Na,and the total dissolved solids are 2.2~2.9 g·L^(-1),the hot water with chloride type indicates the main channel of deep thermal fluid.With the geothermometers of silica,Na-K and K-Mg,the temperature of shallow reservoir is calculated to be 180~206℃,and that of deep reservoir is 215~228℃in Gulu geothermal field.

关 键 词：谷露地热田 水文地球化学 特有组分 地热温标 

分 类 号：P641.3[天文地球—地质矿产勘探] P59[天文地球—地质学]