Chemical field of geothermal water in Xiong'an New Area and analysis of influencing factors

This paper is the result of geothermal geological survey engineering.

Objective The hydrochemical formation and evolution of the geothermal water in the Xiong'an New Area have great significant implications to understand the formation mechanism of geothermal resource.

Methods Geothermal water and cold groundwater in the Rongcheng uplift, Niutuozhen uplift, Baxian depression, Baoding depression, and Gaoyang low uplift were sampled for hydrochemical analyses.

Results There are two thermal reservoirs: Sandstone and karst thermal reservoirs. The main hydrochemical types were Cl·HCO₃-Na and Cl-Na. The TDS values of geothermal water increased with well depths. Mixing of the geothermal water of the Wumishan Formation and the Guantao Formation was observed in the fault zone. The metamorphic coefficients and desulfurization coefficients of geothermal water in the Wumishan Formation were low, indicating a relatively closed thermal reservoir and reduced state, while the sealing of the reservoirs in the Guantao Formation and Minghuazhen Formation was relatively poor.

Conclusions The chemical field of geothermal water in the study area is controlled by the extent of water-rock interaction, faults, the sealing of the reservoirs, and so on. Our result is of great significance for understanding the geothermal resources in Xiong'an New Area and promoting clean heating in winter in northern China.