天津宝坻地区地下水水文地球化学特征

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中文摘要：天津宝坻地区地震观测井是京津冀地区的前兆敏感井,但其水文地球化学特征研究程度比较薄弱.本文选取宝坻断裂南北两侧的3个地震观测井,分析离子组分浓度、氢氧同位素组成、二氧化硅及碳同位素含量,开展水文地球化学特征研究.结果表明:①宝坻断裂北部的宝坻新井及周边冷水井的水化学类型以Na-SO4·HCO3型为主,宝坻断裂南部的王3井、王4井及周边地热井的水化学类型以Na-HCO3型为主.②地下水来源皆为大气降水,补给区为北部燕山山地.宝坻断裂两侧的冷水和地热水位于未成熟水区,表明两者在向上运移过程中皆受到浅表冷水的混合作用.断裂南侧的地热水循环深度明显高于北侧冷水,且地热水Cl-具有深部来源成因.③冷水和地热水的无机碳同位素表现出分区特征,断裂北侧冷水中碳酸盐矿物不饱和,断裂南侧地热水的碳来源为补给区碳酸盐矿物的淋滤作用及碳酸盐岩含水层的溶解作用.④宝坻断裂两侧冷水和地热水的补给区虽然同为北部燕山山地,但由于观测井所在地水文地质条件、循环路径、循环深度等差异,以及宝坻断裂对两侧地下水水文地球化学演化的控制作用,形成了断裂两侧不同类型的地下水.本文研究结果丰富了京津冀地区地球化学背景场数据,为分析区域地下流体地球化学特征提供了科学依据.

外文标题：Hydrogeochemical Characteristics of Groundwater in Baodi Area,Tianjin,China

外文摘要：The seismic observation wells in Baodi area,Tianjin,have been the precursor sensitive wells in the Beijing-Tianjin-Hebei region,but their hydrogeochemical characteris-tics is less studied.In this paper,three seismic observation wells on the north and south sides of the Baodi Fracture were selected to analyze the ionic component concentrations,hydrogen and oxygen isotope compositions,silica and carbon isotope contents,and to car-ry out hydrogeochemical characteristics,and the results show that:① The hydrochemical types of Baodi Xin well and the surrounding cold-water wells in the northern part of the Baodi Fracture were dominated by Na-SO4-HCO3 types,and the hydrochemical types of Wang 3 well,Wang 4 well and the surrounding geothermal wells in the southern part of the Baodi Fracture were dominated by NaHCO3 types.Wang 3 and Wang 4 wells in the southern part of Baodi Fracture and the surrounding geothermal wells are dominated by Na-HCO3 type of water chemistry.The source of groundwater is atmospheric precipitati-on,and the recharge area is the northern Yanshan Mountains.The cold water and geo-thermal water on both sides of the Baodi Fracture are located in the immature water zone,indicating that both of them are mixed by shallow cold water in the upward transportation process.The depth of geothermal water circulation on the south side of the fracture is sig-nificantly higher than that of the cold water on the north side,and the Cl-of geothermal water has a deep origin.The inorganic carbon isotopes of the cold water and the geother-mal water show zoning characteristics.The carbonate minerals in the cold water on the north side of the fracture are not saturated,and the carbon source of the geothermal water on the south side of the fracture is the leaching of carbonate minerals from the recharge zone and the dissolution of the carbonate aquifer.④ Although the recharge zones of cold water and geothermal water on both sides of the Baodi Fracture are the same in the north-ern Yanshan Mountains,different types of groundwater on both sides of the fracture are formed due to the differences in hydrogeological conditions,circulation paths,and circula-tion depths at the locations of the observation wells,as well as the controlling effect of the Baodi Fracture on the hydrological and geochemical evolution of the groundwater on both sides of the fracture.The results of this paper enrich the geochemical background field da-ta in the Beijing-Tianjin-Hebei region,and provide a scientific basis for exploring the geo-chemical characteristics of regional subsurface fluids.

外文关键词：

HydrogeochemistryIonic fractionsThermal storage temperature scaleCarbon isotopesGenesis models

作者：

王熠熙、周志华、李悦、邵永新、李赫、李笑博、龚永俭

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作者单位：

天津市地震局,天津 300201

中国地震台网中心,北京 100045

天津大学地球系统科学学院,天津 300072

关键词：

水文地球化学离子组分热储温标碳同位素成因模式

基金：

中国地震局星火攻关项目国家自然基金面上项目中国地震局震情跟踪任务天津市地震局重点科研项目天津市巨灾防范工程项目天津市巨灾防范工程项目

项目编号：

XH23048C423730672024010301Zd0202401JZFF-1-1JZFF-1-2

出版年：

2024

DOI：

10.12196/j.issn.1000-3274.2024.03.003

地震

中国地震局地震预测研究所中国地震学会地震预报专业委员会中国地震学会地震流体专业委员会中国地震学会地震电磁学专业委员会

地震

CSTPCD北大核心

影响因子：0.733

ISSN：1000-3274

年,卷(期)：2024.44(3)