| The Tanlu fault zone is an important fault affecting the tectonic structure of China,which is great significance to the occurrence of oil and gas resources and geothermal resources.The branches of the fault in the northeast are Yishu fault and Dunmi fault.In particular,the Yishudi Formation thus formed is located in the eastern part of Heilongjiang Province and is a Cenozoic basin.The main filling stratum is the Paleo-Neogene river-lake sediment,which is rich in underground hot water resources.The predecessors carried out a series of researches on oil and gas resources in the mantle,and successfully discovered oil and gas resources in Tangyuan fault depression and Fangzheng fault depression.The research on geothermal resources is relatively rare.Geothermal and petroleum are two resources that coexist in sedimentary basins.It is of great practical significance to carry out research and exploration of geothermal resources in Yishu,and to clarify the characteristics of geothermal resources reserves and time-space distribution.In this study,we selected the geothermal field of Zhaoxing Town,Luobei County,in the Mingshan fault depression in the northern part of the Yishudi Formation.Based on the analysis of the existing data,we conducted geothermal geological survey and used geophysical exploration methods to find thermal storage.In the favorable section of the layer,the geothermal exploration target area is screened out,and the exploration well position is preferably selected,and the construction exploration and production combined with the well.At the same time,comprehensive research on decompression test,hydrogeochemical analysis,geothermal fluid quality analysis and dynamic monitoring was carried out,and its distribution,resource quantity,quality and development and utilization conditions were analyzed.Underground thermal storage conditions and underground heat in the area of Zhaoxing Town,Luobei County.The law of water occurrence and development prospects were evaluated and predicted.The reserves of geothermal resources were explored to evaluate the prospects for geothermal development and utilization in the area of Zhaoxing Town,Luobei County.The study on the genesis of geothermal resources and the formation of geotectonic conditions indicate that there are three main types of geothermal sources that are important to the formation of geothermal resources in the geothermal field of Zhaoxing Town,Luobei County,namely,the heat of the upper mantle and the heat generated by the decay of radioactive elements in the crustal rocks.The frictional heat is constructed,and the main heat source comes from the normal heat conduction in the deep crust.The geothermal resource gathering zone is formed in the rift tectonic environment.The shells in this rift tectonic environment have high connectivity and openness,and havegood conditions for the deep heat source to transmit heat upwards.A good passage for geothermal transport to the upper formation.In the study area,the mantle formed by the Yishu fault zone is a medium-low temperature layered thermal reservoir,which is the main structure for the formation of geothermal resources.In this paper,the geothermal geological conditions and geothermal fluid chemical characteristics of the geothermal field in Zhaoxing Town,Luobei County are analyzed in detail.The geothermal gradient in this area is2.5?/100 m,and the geothermal flow value is 41.8-57.5m W/m2.Geothermal fluid water chemistry The type is HCO3-Na,the salinity value is 2628.30mg/L,the geothermal resource exploration type in this area is type II-1,and the geothermal resource reserves and the recoverable hot water amount are calculated in the study area of 66.6km2.The thermal storage method is used to calculate the basic heat of the thermal reservoir,and then the geothermal fluid recoverable amount is calculated by the analytical method:The total heat storage energy(Q)of the study area calculated by the thermal storage method is 8.34457×1017J,and the recoverable heat energy is 5.9×109MJ.The average well placement method is used to lay out the production well according to the thermal storage boundary conditions,and the geothermal well can be laid 2 in the study area,the output of single well is 968.22m3/d,the amount of geothermal water that can be mined in geothermal field is 1934.44m3/d,and the annual heating area is 18,700m2.The geothermal field in the study area has an annual production capacity of 3.115 MW,which is a small low-temperature geothermal field.Based on the sampling,indoor analysis and test,on the basis of ascertaining the physical properties,chemical composition and changing laws of geothermal fluids,comprehensive evaluation is carried out according to the current relevant evaluation standards in China.The geothermal water in the study area is rich in metaboric acid.Medical value of hot mineral water chemical components,and contains a variety of trace elements.The metaboic acid of geothermal fluid reaches the concentration of medical value,suitable for medical hot mineral water development,suitable for bathing.It can be used for geothermal heating through anti-fouling and anti-corrosion treatment.The geothermal field in Zhaoxing Town of Luobei County is an economical and suitable mining area.According to the temperature of geothermal fluid,it can be used in the direction of heating,medical treatment,bathing and breeding.In the development and utilization of geothermal resources,due to the large pressure of the formation in the early stage,it is necessary to carry out harmless treatment of the directly used geothermal water,and to achieve the discharge of the standard;and through the dynamic monitoring work,the geothermal tail water in the middle and late stages should be tailed in time.Water recharge,effectively protecting the thermal reservoir. |
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