The Research On Artificial Recharge Of Super-deep Geothermic Water In Kaifeng City

Geothermal water resources are rich in kaifeng city, but with the increasing of geothermal development density and intensity, underground water level was declining and groundwater depression cones areas have already been constantly expanded. Super-deep underground hot water in natural recharges slower, long-time pumps with never being added will result in resource exhausting, ground subsidence and a series of geological environment problems.On the basis of collecting the geothermal well logging materials and the researching achievements, the formation, supply, migration and drain conditions of super-deep geothermal water resources in Kaifeng city are discussed, and the distribution characteristics of super-deep geothermal temperature, chemical and rich water are studied, and the results can be presented that the underground water level depression cones areas that have been formed in Kaifeng city. To improve the current states, the recharge test is carried out, and the water temperature, water quality change, etc are discussed. According to the parameters from the relative materials and the test results, the mathematical model of groundwater in the researching area is built, and then the layout scheme for the reinjection well is designed according to the assigned recharging target. Finally, based on the hydrogeological conditions and the results of the recharging test of Kaifeng city, the recharging feasibility problems are discussed.The research results show that the super-deep geothermal aquifer is thick with better storage conditions in Kaifeng district and shows the type of static storage consumption under the mining states; the chemical constituents of every geothermal reservoirs are mainly from surrounding rock and lon composition are steady, and the water-rock balance is kept; the groundwater depression cones areas are formed in the three sub-reservoir with 800~1400m depth, and extended to the west area in the center of Daliangmen; In the reinjection test, the injection approaches 35m3/h, and the water temperature and quality doesn't obviously change. The layout scheme of the reinjection well for overexploitation area is designed based on The formula, and the groundwater in 70~170m is selected as the reinjection water source. In summary, the geological conditions shows good in Kaifeng City area, the project of the artificial reinjection and recharging water source for super-deep geothermal is feasible which can complement geothermal reserves, and promote the sustainable development of geothermal resources.