Analysis of geothermal storage reinjection test in Minghua Formation of Neogene in Luohe area
Geothermal reinjection is an important way to maintain the sustainable exploitation of geothermal resources and an effective measure to prevent the geological environment problems such as land subsidence.In order to improve the utilization rate of geothermal resources in the Luohe area of Henan Province,reinjection tests and numerical simulation researches were carried out,and the main fac-tors affecting reinjection were analyzed.Research results indicated that the Neogene system Minghuazhen Formation had good geothermal storage reinjection effect and great reinjection potential,and the maximum allowable reinjection volume for heterogeneous water sources was 26.761 m3/h,and the maximum allowable reinjection rate for same layer water sources was 33.060 m3/h.It was recommended to use a well layout of one extraction and two reinjections for the reinjections of heterogeneous water sources in the Luohe area,and a well layout of two extraction and three reinjections for the reinjection of same layer water sources.It was suggested to use a well spacing of 300 m for the reinjection.The reinjection amount increased with the increase of reinjection pressure,but the unit reinjection amount and permeability coefficient decreased with the increase of pressure,indicating that pressurized reinjection can affect the reinjection amount by affecting the permeability performance of geothermal storage.The lower the temperature and density of the geothermal water for rein-jection,the greater the pressure at the bottom of the well,and the better the reinjection effect.
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