Characteristics And Resource Evaluation Of Haigeng Block Of Kunming Geothermal Field

China is a country rich in geothermal resources,especially low-temperature geothermal resources all over the country.Underground hot water is both a valuable water resource and a promising“clean”alternative energy source for new energy sources,with environmental and economic advantages.However,the lack of effective management of the exploitation and utilization of geothermal resources has led to the depletion of many geothermal resources or the shortened service life.Therefore,it is necessary to effectively evaluate geothermal heat and rationally develop and utilize geothermal resources.The Kunming geothermal field Haigeng block is located in Kunming City,which belongs to the Kunming Basin and has a high degree of hydrogeological conditions.This paper systematically analyzes the geothermal structure of the Haigeng block,and provides a theoretical basis for the exploitation and utilization of geothermal resources by calculating the storage of geothermal resources and predicting the geothermal flow field.Based on the data collection and field investigation,this paper analyzes the hydrogeological conditions of the study area and explains the conditions for the formation of heat storage.By analyzing the detection data of water samples,the water chemistry characteristics of geothermal water in the study area are obtained.Based on Surfer software research the spatial distribution characteristics of geothermal water chemical field and the influence of fracture structure and mining well on chemical elements;the geochemical type of geothermal water is determined by Spss and Origin software;the deep heat is calculated by chemical temperature scale method through the detected element content Storage temperature,this study mainly uses SiO₂,K/Mg temperature scale to estimate the heat storage temperature of the study area.The temperature scale calculation results show that:K-Mg temperature scale,except for individual values,most of the temperature scale calculation values are reasonable,relatively close to being developed and utilized.The measured temperature of the thermal reservoir;likewise,the quartz conduction temperature?except ZK11,ZK1?can also be used as the basis for inferring the heat storage temperature.Through the calculation of the geothermal field temperature scale,the K-Mg and SiO₂ temperature scales are all applicable to the estimation of the heat storage temperature in the study area.A generalized description of the geometry and physical form of geothermal fields including caprocks,channels,heat reservoirs,and heat sources.The research and analysis of geothermal conditions,geothermal field characteristics,geothermal fluid dynamic field characteristics and geothermal formation mechanism in the study area,the corresponding geothermal geological model is established,and the heat source,thermal reservoir,heat conduction form and thermal fluid source of the geothermal system are described and determined.The parameters of thermal storage and thermal reservoir fissure rate and thickness are calculated by thermal storage method combined with grid division.The total geothermal resource of thermal reservoir is2.84×10¹⁸J,and the recoverable geothermal resource is 0.426×10¹⁸J.The geothermal hydrostatic reserve of the thermal reservoir is 7.6704×10⁸ m³,and the remaining hot water resources in the geothermal block are 16423.9476 million m³.Based on the existing geothermal well data,geophysical and geochemical exploration and geothermal fluid development and utilization dynamic data,the three-dimensional visualization model of the Haitang block is established based on the regional geothermal geological conditions using the GMS stratum solid model module.Showcase the heat storage structure.Through the statistical analysis of a large number of thermal storage parameters in the study area,the parameters of the Dengying Formation thermal reservoir were partitioned,and the three-dimensional unsteady flow mathematical model and numerical model of the Dengying Formation thermal reservoir were established.The flow field and observation hole fitting verification and error were used.The model was simulated and identified by the analysis,and the numerical model constructed was objectively in line with reality.The model is used to predict the water level of the thermal reservoir after 10,30,and 50 years and the groundwater flow field.Optimization suggestions for the future production well layout and production volume of the geothermal field are given.