| 河北牛驼镇与天津地热田水化学和氢氧同位素特征及其环境指示意义 |
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| 关键词:Niutuozhen geothermal field Tianjin geothermal field hydrochemical differences hydrogen and oxygen stable isotope environmental significance |
| 基金项目:中国地质调查局地质调查项目(编号: 121201006000150009) |
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| The Hydrochemical and δ2H-δ18O Characteristics of Two Geothermal Fields in Niutuozhen of Hebei Province and Tianjin and Their Environmental Significance |
| Based on hydrochemical characteristics and existing environments of low to medium temperature geothermal fields, the authors revealed an obvious difference of the mixing lines from Quaternary groundwater to Wumishanian geothermal water between Niutuozhen and Tianjin geothermal fields. The water-rock interaction between high temperature geothermal fluid and carbonate rock from the Ordovician and Wumishanian Formation (OAWF) geothermal reservoir may cause δ18O shift. The geothermal water from the Minghuazhen and Guantao Formation is formed by mixing with Quaternary groundwater and geothermal water from the OAWF in Niutuozhen. Cl– and HCO– 3 of the geothermal water from the OAWF in Niutuozhen increase with decreasing SO2– 4 (0.20~1.30 mg/L), which is obviously lower than SO2– 4 (273~394 mg/L) in the geothermal water from the OAWF in Tianjin, indicating that the sulfate reduction has occurred in the geothermal water from the OAWF in Niutuozhen. The process of sulfate reduction could enrich the δ2H of the geothermal fluid from the OAWF in Niutuozhen by releasing H2S. The hydrochemical and δ2H-δ18O characteristics prove the relatively reducing environments and weak hydraulic connection with Quaternary groundwater for geothermal water from the OAWF in Niutuozhen. The geothermal water from the OAWF in Niutuozhen has also been mainly recharged by lateral infiltration of precipitation, whereas the geothermal water from the OAWF in Tianjin has strong hydraulic connection with Quaternary groundwater and has been recharged by vertical and lateral infiltration of precipitation. The geothermal water development in Xiongan New Area and Tianjin has great potential. However, researchers must adhere to the principle of paying equal attention to resources and environment in the development of geothermal water and ensure the sustainable development and utilization of geothermal resources. |
| YANG Ji-long,LIU Fu-tian,JIA Zhi,YUAN Hai-fan,XU Qin-mian,HU Yun-zhuang.2018.The Hydrochemical and δ2H-δ18O Characteristics of Two Geothermal Fields in Niutuozhen of Hebei Province and Tianjin and Their Environmental Significance[J].Acta Geoscientica Sinica,39(1):71-78. |
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