Genetic Mechanism Of Underground Thermal Water In Triassic And Prediction Of Geothermal Favorable Area In Suijiang,South Sichuan

In recent years,with the rapid economic and social development of our country,problems such as the irrational development and utilization of resources and environmental pollution have become increasingly prominent.In order to ease the situation of resource shortages and to build an environment-friendly society,we need to gradually change the current use of national resources.Geothermal resources have become a new type of energy that promotes the development of production and living because of its environmental characteristics and reproducibility.Geotherm c al resources play an important role in promoting the coordinated development of the economic environment and adjusting the energy structure.The economic benefits of geothermal resources are studied to promote geothermal resources,The rational and effective development and the drive for economic growth have important implications.This paper based on the hydrogeological investigation,hydrochemical analysis,and information revealed by drilling,this paper studies the formation conditions and the law of occurrence of geothermal resources in the study area;Based on this,the underground hot water favorable area in the study area is predicted.Thesis mainly obtained the following research conclusions and results:?1?Through the distribution characteristics of underground hot water in the south of Sichuan,most of the underground hot water naturally exposed in the area is located in the fault zone or the intersection of two groups of faults.The northeast and northwest,east west and north east directions Hot springs at the intersections are often exposed in groups,and the hot spring spots directly exposed in the fault zone tend to be distributed linearly;in the north of the area,due to the large surface area covered by sediments,abundant low-temperature underground geothermal water resources and geothermal resources are reserved.Mainly through deep drilling,the underground hot water in the study area belongs to this type.In the southern part of the area,the cover is thin,and the underground hot water is exposed through the water channel;the regional underground hot water quality is obviously different due to the difference of the thermal storage layer.In the area,the thermal storage layer is Yangxin limestone.At the time,the main hydrothermal types of underground hot water were HCO₃·Cl-Na·Ca and Cl-Na type water;the underground hot water chemical type of the Cambrian strata was Cl-Na type water;For the Jialingjiang Formation,the underground hot water chemical type is SO₄-Ca water.?2?By analyzing the geothermal characteristics of the area,the underground hot water mainly uses the geothermothermic heating to heat the underground hot water in the area;the borehole temperature of the Suijiang-1 well is calculated to calculate the borehole of the Suijiang-1 well.The geothermal gradient is 33.8°C/km,and it is obtained through the relationship between the water temperature in the western Grand Canyon and the depth of the well.The geothermal gradient of the borehole in the Grand Canyon hot spring is 36.5°C/km.Geothermal gradients in the study area are in the form of west-low east high,and the geothermal heat mainly comes from the underground heat source of the Huayinshan large fault and the geothermal effect of the Luzhou paleo-uplift on the uplifted edge.?3?According to the situation of the inrush water in the formation and borehole drilled this time,it is concluded that the depth of the drilled fault is 613m.The Leikoupo Formation in the study area can be divided into three sub-sections:T₂l^3-3,T₂l^3-1,and T₂l¹ are aquifers,and the rest of the sub-segments are impermeablelayer.The Jialingjiang Formation can be divided into four sub-segments where the T₂j⁴segment is the relative aquifer and the remaining sub-segments are impermeablelayer.?4?By analyzing the chemical characteristics of the Suijiang-1 well,it is known that it belongs to the mineral barium silicate mineral water.Studying the hydrogeochemical characteristics and borehole lithology of the borehole of the Minjiang-1 well,it can be seen that the underground hot water of the borehole is gypsum layer,and the water quality is affected by the leaching effect of the gypsum layer.The underground hot water is mainly supplied by atmospheric rainfall,and the recharge elevation is 1381-1646m.Combined with the geological background and hydrogeological conditions of the study area,it is inferred that the recharge formation of the hot spring water is the Liukupo Formation limestone strata of the Middle Triassic System.The karst developed in the stratum,and the karst caves,karst depressions,and sinkholes are widely distributed.The atmospheric precipitation enters the groundwater circulatory system through the surface karst pattern of the Longqiao anticline,tensile fractures,cracks,and karst depressions in the south-north region.The temperature of the deep circulation water increases.High,then blocked by the Shuanghe fault zone,translated along the fault plane to the lower part of the drill hole,and later exposed to geothermal water.?5?Using GOCAD to construct a three-dimensional geological model of the study area,analyze and study the structural characteristics,geothermal field,and Triassic burial depth characteristics in the study area,and finally predict that there are three favorable areas of underground hot water in the study area.Two of them are located around Pingshan County and Suijiang County.Underground hot water resources are abundant.If we can detect geothermal resources,develop and use the advantages of external conditions,it is easy to get better use.?6?According to different compensation conditions,the favorable area of underground hot water in the study area is partitioned.The volumetric method and the pressure storage method are used to calculate the amount of thermal storage resources and hot water storage in the study area;The total internal heat storage area is755.6km²,the exploitable heat resource amount is 188.56×10¹⁶J,which is converted into standard coal 64.33t;the underground hot water resource amount is 84.41×10⁸m³;the research area is rich in geothermal resources and has great development potential,so the research area is The rational development and utilization of geothermal resources will bring great economic benefits to the study area.