Evaluation Of Geothermal Resources In Beier-Wuerxun Depression

Since the beginning of the 20 th century,the energy crisis has gradually become prominent,and people have not stopped their efforts to find alternative energy sources.As a renewable resource,geothermal resources are characterized by large reserves and little pollution to the environment,and can be seen as new upstarts in new energy sources.At present,some geothermal resources have only been studied in the Songliao Basin in the Northeast,and the study of geothermal resources in the entire Hailaer oil region and basin is still in its infancy.In this paper,we evaluate the geothermal resources of two high-exploration depressions in the Hailar Basin,ie,the Baer depression and the Wuerxun depression,and provide basic data and references for the development and utilization of geothermal resources in the entire oil region and basin.In this study,we mainly used the test data of oil exploration wells,logging data,and exploration and research results of the Hailaer oil field.We studied the underground heat sources and control factors of geothermal resources in the Beier-Wuerxun Depression.Through the study of the geothermal field and temperature characteristics of different horizons in the study area and the deposition conditions of different strata,the existing data were used to divide the horizon of the geothermal reservoir.Analyze the hydrogeological conditions of geothermal water for geothermal energy.Through the above studies,a comprehensive evaluation of geothermal resources using the “thermal storage method” was conducted in the study area.Based on this,the single well production capacity was calculated and the favorable area for exploration in the research area was selected.The study shows that the geothermal gradient of the Beier-Wuerxun depression is between3.4-4.3°C/100 m and the geothermal flow is 61 m W/m2 on average,indicating that the Beier-Wuerxun depression has good geothermal field characteristics.The deep faults in the basement of the Beier-Wuersun depression are a good channel for underground heat sources to conduct into the thermal reservoir.The large-scale distribution of granite in the basement becomes a unified underground deep heat source for thermal reservoirs.The main heat reservoirs in the study area are Daimoguahe Formation,Nantun Formation and Tongbomiao Formation.The groundwater type in the Beier-Wuerxun depression is Na HCO3,and the groundwater is alkaline.Combined with the above analysis,the total amount of the Beier-Wuerxun geothermal resources is 3.539×1020J,and the geothermal energy recoverable resource is 5.531×1018J,which is equivalent to 1.8899×108 tons of standard coal.Judging from the geothermal water recoverable resources,the thermal resources of the Nantun Formation are relatively high.The amount of hot water resources of the Nantun Formation has been calculated to be 2.703×1010m3,and the geothermal energy recoverable resource is 2.022×1018J.equivalent to 6.908×107 tons of standard coal.The eastern part of Wuerxun Depression has high temperature and high single well output.It is a type I favorable area for future geothermal exploration and development.