Study On The Evaluation,development And Utilization Of Geothermal Resources In Zhalong Township,qiqihaer City

Zhalong Township Located in the west of the Songnen Basin.Which has high heat flow and high geothermal gradient features.The geothermal system consists of the upper cap,the central thermal reservoir and the lower heat conduction layer.According to the main geological conditions of geothermal formation,the thermal reservoir in this area is a sedimentary basin type?conducting type?,which has wide distribution area,little change in lithology and thickness,stable distribution and relatively simple structural conditions.This paper selects the geothermal field in Zhalong Township as the research object.According to collecting,sorting and analyzing the existing data,it conducts geothermal geological surveys,uses geophysical exploration methods to explore favorable enrichment areas of geothermal resources,and constructs exploration and mining combined wells.With geophysical logging,pumping test,geothermal fluid quality evaluation,etc.,comprehensively identify the geothermal resource characteristics and heat storage distribution in the study area,and then carry out resource potential analysis,propose a rational development and utilization plan,and evaluate the geothermal development and utilization prospects in Zhalong Township.The paper analyzes geothermal geological conditions and geothermal fluid chemical quality characteristics in Zhalong Township.Geothermal field type is?II?type II-1?type of layered heat storage geothermal field?.The geothermal field is a medium-and low-temperature geothermal field,and the geothermal field is small in scale.Boundary conditions are infinite boundary conditions for the distribution of thermal reservoirs.According to the well of Zhalong-1,the geothermal resource caprock of geothermal resources is loose sediments and sedimentary rocks with burial depth less than 800m;the thermal reservoirs are mainly distributed in the Cretaceous Nenjiang Formation,Yaojia Formation and Qingshankou Formation with burial depth greater than 800 m.In the Quantou Formation and the Jurassic sandstone and siltstone.Among them,the distribution of thermal reservoirs in Quantou Formation is the most concentrated.The heat source is the source heat.The self-flow flow of Zhalong-1 is 64.11m³/h,the outlet water temperature is 45°C,the thermal reservoir thickness is 94.3m,and the geothermal fluid of Zhalong-1 is Cl?HCO₃-Na weak alkaline water and salt water.The geothermal fluid temperature reaches the physiotherapy hot mineral water standard,and the geothermal well water can be named warm water.Geothermal fluid is not suitable for direct drinking mineral water.Groundwater is not suitable for direct drinking water or direct irrigation.The temperature is suitable for physiotherapy,bathing and heating.The heat storage method calculates the thermal energy stored in the geothermal field thermal reservoir is 2.41×10¹⁷J,wherein the heat stored in the rock is 1.76×10¹⁷J,and the heat stored in the water is 6.43×10¹⁶J.The geothermal fluid calculated by the analytical method is 1484.24m³/d,and the sustainable mining is 100 years.After 100 years,the groundwater level drops by 106.53 m.The geothermal fluid can be used thermal energy is 1.95×108MJ per year,and the thermal power is 3709.90 kW.The extent of geothermal reserves is determined to be controlled.After calculation,the economic value in the work area for one year is 3,358,900 yuan.The geothermal resources can save the cost of treating waste gas and solid waste by 1,868,100 yuan.According to the depth of basement burial,combined with the location of heat storage in Zhalong-1 well,it is recommended that the well depth in the study area is 1000¹600m,and geothermal resource development is economical.The production capacity of geothermal fluid in the completion capacity of the Zhalong-1 well is more than 5 and less than 50,which is a suitable mining area.The utilization direction of geothermal water in Zhalong-1 well is physiotherapy bathing and heating.The geothermal fluid of Zhalong-1 well is based on the discharge water quality evaluation standard,and its water quality is very poor.After development and utilization,the geothermal fluid cannot be directly discharged.The development of geothermal resources should adhere to the sustainable development strategy.Align the effective management of geothermal resources and surrounding environmental protection in Qiqihaer City.