Abstract:

Tangquan is located in the northwest of Zunhua city, Hebei Province. The region is of hilly landscape, and rich in geothermal resources. It is of great importance to elucidate the genesis mechanism of the geothermal field for sustainable development of the geothermal resources. In this paper, we conducted a systematic study to explore into the genesis mechanism through well temperature logging and hydrogeochemical investigation. Results show that the geothermal field belongs to a low to medium temperature geothermal system of convective type. The geothermal fluid origins from the rainfall recharged in the mountainous area located to the north of geothermal field, with a recharge elevation of more than 935 m. The geothermal fluid is gradually heated by the surrounding rock under a normal heat flow background during a deep cycling of ca. 4,800 m, with a reservoir temperature of ca.130  ℃. In the zone of Fuquan palace to sanatorium in Tangquan area where several faults cut through the monzonitic granite body, the geothermal fluid up flow along the faults and mix with the fissure water stored in the gneisses, forming the Tangquan geothermal field.

Key words: Tangquan, geothermal field, genesis model, low-medium temperature geothermal system of convective type