Characteristics Of Heat Reservoirs And Evaluation In K₁Q₃₊₄ To K₁Y₁ Of Geothermal Resources In Daqing City

Geothermal has the advantages of abundant reserves,wide distribution,low cost,safety and stability,clean and environmental protection.It is the most realistic and competitive energy in the new energy family and has been highly valued by the international community.Daqing is a typical resource-based city with oil as the pillar industry.Oil and natural gas are the sunset industry.At present,they are facing increasing depletion.It is an urgent task to find alternative industries and realize energy transformation.There are abundant geothermal resources underground in Daqing.The development and utilization of geothermal resources can inject new vitality into the sustainable development of Daqing,so geothermal is the most ideal energy for Daqing to replace oil.In this paper,Daqing City is taken as the research object.The study area is located in the northern part of the central uplift tectonic belt in the Songliao Basin.According to the structural unit division in the basin,it is located in the first-level structural unit in the central depression area.On the basis of fully collecting relevant literature and data,the geological structure,sedimentary characteristics and stratigraphic sequence of the study area are preliminarily identified.Based on the geothermal gradient and ground heat flow value,combined with the change trend of the buried depth of each stratum,the thermal storage temperature characteristics are determined.The samples of geothermal water in different layers were analyzed,and the trace and constant elements of water chemistry were analyzed to determine the equivalent distribution map of each ion content in different water layers.Through the quantitative calculation of porosity and permeability of thermal storage physical parameters,the distribution law of thermal physical properties in Daqing city is predicted in plane and longitudinal direction.The prediction model of natural productivity of single well in thermal storage is established.The effective porosity,permeability,effective thickness of hot water layer and other parameters are selected to calculate the productivity of single well.The volume method is used to calculate the geothermal water and heat resources,and the calculation results are analyzed and evaluated.The results show that the reservoir physical properties of Yaojia Formation in the study area are the best,the average porosity is greater than 22%,the average permeability is greater than 217×10^-3?m²,and the plane distribution of physical parameters is generally high in the west and north and low in the east.The geothermal resources in this area are 7.29×10¹⁰m³,and there are still 5.1×10¹⁰m³of geothermal resources in this area,excluding the factors of difficult exploitation of oilfield water injection and production.According to the calculation of 1 well per square kilometer and daily production of 1000m³per well in the study area,the stable production can be achieved for 40 years.It is considered that the northeastern part of Daqing City-Saertu and Dongfengxincun areas...