The Reinjection Research of Dongli Lake Bedrock Reservoir in Binhai New Area, Tianjin

Abstract

Wumishan reservoir has the characteristics of better fracture, water yield and water quality and is main development and utilization reservoir in Dongli Lake Area, Tianjin. There are 11 Wumishan wells including 5 pumping wells and 6 reinjection wells. Under the impact of Shanlinzi geothermal field exploration, the static water level gradually drops and the drawdown is about 3m/a. At present, the static water level is about 110m and the deepest static water level is about 129m. In order to reduce water level dropping, concentrating reinjection location is built using treated lake water as reinjection resources in Dongli Lake Area. The reservoir parameter is set according to reinjection test and the most reinjection rate is 152 m³/h. On the basis of scientific geological model, the pressure, temperature and hydrochemistry of reservoir are simulated and predicated using TOUGH2.0 and PHREEQC software. The research results show that the 5 years, the temperature and hydrochemistry have no changes and the water level can reduce 1m/a drawdown due to the lake water reinjection.