Study on the Characteristics of Geothermal System in Yanqing Geothermal Field

Abstract

Geothermal resource is a sort of renewable clean energy. The development and utilization of geothermal resource in Beijing plain for nearly 50 years. Geothermal resource become an important part of energy structure and has made outstanding contributions to economic development and environmental improvement in Beijing. According to geological structure, geothermal geological conditions, economic and technological conditions, 10 relatively independent and certain connections geothermal field are divided. Yanqing geothermal field is one of them which exists more than 20 geothermal wells. On the basis of collecting the geological information and exploration achievements, the Yanqing geothermal system is discusses and studied in this paper. The reservoir cap-rock of Yanqing geothermal field are Quaternary and Cretaceous-Jurassic strata, the average geothermal gradient are 3.37℃/100m and 2.14℃/100m respectively. The geothermal reservoir is Wumishan formation of Jixian system, the average geothermal gradient is 1.36℃/100m. The grid connection formed by the NE-trending and nearly NS-trending structure is conducive to supply the uplift fracture zone from deep geothermal reservoir, furthermore, the deep heat flow is conductive and diffused in the whole Yanqing basin. The gird connection forms a better heat conduction and water channel. The characteristics of geotemperature field indicate that the formation temperature is mainly related to bedrock relief.