| Hydrogeochemistry and Origin of Thermal Groundwater in Bedrock Aquifers in Tianjin, China |
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| 作者姓名： | Zhou Xun Fang Bin Shen Ye Zhang Hua School of Water Resources and Environment China University of Geosciences Beijing China Lin Li Lin Jianwang Tianjin Institute of Geothermal Exploration Development and Design Tianjin China |
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| 作者单位： | Zhou Xun Fang Bin Shen Ye Zhang Hua School of Water Resources and Environment，China University of Geosciences，Beijing 100083，China Lin Li Lin Jianwang Tianjin Institute of Geothermal Exploration Development and Design，Tianjin 300250，China |
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| 基金项目： | ThisworkisfundedbytheMinistryofEducationofChinafortheKeyProjectsofScienceandTechnologyResearch (No .0 2 0 2 6) |
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| 摘 要： | INTRODUCTIONThermalgroundwaterisfoundtohaveoccurredinthebedrockcarbonateaquifersofLowerPaleozoicandMeso toNeo ProterozoicErathemsnearTianjin ,China .Thebedrockaquifersexistinthelayersbetweenabout 10 0 0mandmorethan 4 0 0 0mbelowthelandsurface .Thethermalwaterhasbeensuccessfullydevelopedoverthepast2 0yearstoprovideasourceofhotwaterforavarietyofresidentialandindustri alpurposes.Geothermalwellstappingtheaquifersarecapa bleofproducingcommercialquantitiesofhotwaterwiththetemperaturesranging…
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| 关 键 词： | 水文地球化学 地下水 矿床 蓄水层 |
Hydrogeochemistry and Origin of Thermal Groundwater in Bedrock Aquifers in Tianjin, China |
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| Zhou Xun Fang Bin Shen Ye Zhang Hua School of Water Resources and Environment,China University of Geosciences,Beijing ,China Lin Li Lin Jianwang Tianjin Institute of Geothermal Exploration Development and Design,Tianjin ,China.Hydrogeochemistry and Origin of Thermal Groundwater in Bedrock Aquifers in Tianjin, China[J].Journal of China University of Geosciences,2004,15(1):110-114. |
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| Authors: | Zhou Xun FANG Bin Shen Ye Zhang Hua Lin Li Lin Jianwang |
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| Abstract: | Thermal groundwater resources were found to have occurred in deep-seated bedrock aquifers in the northeastern North China plain near Tianjin, China. Meso- to Neo-Proterozoic and Paleozoic carbonate rocks on the Cangxian uplift are capable of yielding 960-4 200 m3/d of 60 to 96 ℃ water from the wells ranging in depth between 1 000 and 4 000 m. Conductive heat flow of 0.063 to 0.144 2 W/m2 from the deep crust is responsible for this anomalous geothermal field. The water in the Ordovician aquifer is characterized by relatively high TDS, high concentrations of SO4 and SO4*Cl-Na*Ca type, but the waters from the Meso- to Neo-Proterozoic and Cambrian aquifers, by relatively low TDS, low concentrations of SO4 and predominantly Cl*SO4-Na type. It is noted that when the temperature of the waters increases at a rate of 10 ℃ in the range of 30-100 ℃, the content of SiO2 increases at a rate of 12 to 15 mg/L, and fluoride concentration increases at a rate of 2.3 to 2.5 mg/L. Hydrochemical and isotopic data suggest that the thermal water in the bedrock aquifers is of meteoric origin and recharged in the northern mountain area to the north of the Baodi-Ninghe fault, and then flows laterally for a long distance from the north to the south to the city of Tianjin. Temperature of the waters increases because of heat exchange with the rocks and recharge by conductive heat flow from beneath. |
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| Keywords: | thermal groundwater hydrogeochemistry isotope geothermal field geothermal resources |
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