Geothermal field in Tongzhou District of Beijing and its influencing factors

Based on a large number of geothermal well temperature data, the distribution of the current geothermal field in Tongzhou District of Beijing is systematically analyzed, the geothermal anomaly area is divided, and the formation temperature at the depth of 1000~3000 m is further estimated. The results show that the current geothermal gradient ranges from 1.34 ℃/100 m to 3.12 ℃/100 m with an average of 1.88 ℃/100 m. Terrestrial heat flow values range from 47.1 mW/m² to 75.9 mW/m² with an average of 63.2 mW/m². Vertically, the estimated temperature in the study area is over 30 ℃ at depth of 1000 m, the temperature of the high temperature abnormal area is over 60 ℃ at 2000 m, and over 80 ℃ at 3000 m. According to the estimation of deep formation temperature, there exist two high temperature anomaly areas in its south and southeast. Controlled by regional geological structure, the distribution pattern of geothermal field is basically consistent with the strike of regional main faults. In addition, the lithology is also one of the important influencing factors.