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Geoscience ›› 2022, Vol. 36 ›› Issue (02): 474-483.DOI: 10.19657/j.geoscience.1000-8527.2022.017

• Water Resources and Environmental Research • Previous Articles     Next Articles

Genesis Model of Geothermal Water in Dandong Area of Liaoning Province Based on Hydrogeochemical Characteristics

YANG Fengtian1,2(), SHI Yujia1,2, LI Wenqing3,4()   

  1. 1. College of New Energy and Environment, Jilin University, Changchun, Jilin 130021, China
    2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, Jilin 130021, China
    3. College of Earth Sciences, Jilin University, Changchun, Jilin 130021, China
    4. Key Laboratory of Northeast Asia Mineral Resources Evaluation, Ministry of Natural Resources, Changchun, Jilin 130021, China
  • Received:2021-08-06 Revised:2022-03-02 Online:2022-05-10 Published:2022-06-14
  • Contact: LI Wenqing

Abstract:

Geothermal resources are abundant in Dandong. It is of great significance to establish the genesis model of the geothermal fields for sustainable utilization and further development. The geothermal fields of Bei-tang, Dongtang and Wulongbei were investigated for hydrochemical and isotopic analysis. The results show that the hydrochemical types of Beitang, Dongtang and Wulongbei geothermal water are SO4·Cl-Na·Ca, HCO3·SO4-Na and HCO3-Na·Ca, HCO3·SO4-Na and HCO3·Cl-Na, respectively. The source of the thermal water is atmospheric precipitation. The recharge elevations of Beitang and Dongtang geothermal fields are 678 and 376 m, respectively. According to 14C dating methods, the ages of the thermal waters in Beitang, Dongtang and Wulongbei geothermal fields are 2,000-3,300 and 2,200-7,200 and 700-2,900 a B.P., respectively. The reservoir temperatures of Beitang, Dongtang and Wulongbei geothermal fields are predicted to be 92, 120, and 100-101 ℃, respectively according to the silica and lg(Q/K) geothermometer. The thermal water circulation depth of Beitang, Dongtang and Wulongbei geothermal fields are ca. 1,900, 3,000 and 800-1,800 m, respectively. The thermal water is heated up during deep circulation through the fault zone, and then upwelled into shallow aquifers or outcrops as springs at the intersection of NNE and NW trending faults, which belong to low to medium temperature geothermal system of convective type.

Key words: Dandong, geothermal field, genesis model, low to medium temperature geothermal system of convective type

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