Abstract

Geochemical and geophysical investigations were carried out to obtain more evidence of the potential of geothermal resources in Chunxiao Town (China). Hydrochemical data indicate the possible existence of mixing process between deep geothermal water and shallow groundwater. Analysis with SiO2 geothermometer shows that the geothermal reservoir temperature was estimated around 40–60 °C. In addition, combination investigations with CSAMT, radioactive radon, and soil thermal-released mercury detection reveal the specific location of the conduction fractures for thermal water circulation. Furthermore, the drilling work shows the deep thermal water temperature of >55 °C and the thermal water yield of 300 m3/d. All these results could provide important guidance for the scientific exploration and effective utilization of geothermal resources in coastal area.

Highlights

  • IntroductionAs an important renewable clean energy, geothermal resources (including guidance and the low-to-medium temperatures) have been of extensive concern all over the world for residential and commercial purposes, such as space heating and electric power generation [1,2,3]

  • As an important renewable clean energy, geothermal resources have been of extensive concern all over the world for residential and commercial purposes, such as space heating and electric power generation [1,2,3]

  • A systematic assessment of the low-to-medium temperature geothermal resources would provide a useful guidance for the sustainable development and utilization of thermal water

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Summary

Introduction

As an important renewable clean energy, geothermal resources (including guidance and the low-to-medium temperatures) have been of extensive concern all over the world for residential and commercial purposes, such as space heating and electric power generation [1,2,3]. A systematic assessment of the low-to-medium temperature geothermal resources would provide a useful guidance for the sustainable development and utilization of thermal water. Hydrogeochemistry methods are an important way to obtain some useful information, such as geothermal fluid origin, mixing processes, water–rock interactions, reservoir rock, and reservoir temperature [5]. With isotope composition analysis (such as strontium, oxygen, and hydrogen), the sources of the thermal fluid (rainfall or seawater) and mixing processes between thermal water and shallow groundwater can be determined [3,10] and, based on the geothermometers (such as Na–K–Ca, Na/K, Na/Li, and silica), the geothermal resource temperature can be estimated, to support the assessment of thermal resource capacity

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