Hydrochemical Characterization And Water-rock Interaction Of Thermal Spring Waters In The Deep Fault Region In Western Guangdong And Southeastern Guangxi

The shortage of traditional energy and the environmental problems caused by its use promote the development and utilization of clean energy.As clean energy,geothermal resources are widely used,which can produce significant social and environmental benefits.In addition,the current theoretical research is not deep enough,lacking comprehensive development and utilization,which has great potential for development and utilization.With the rapid development of economy,continuous improvement of urbanization level,improvement of quality of life and enhancement of environmental awareness,the demand of people for geothermal energy has increased.Therefore,the exploitation and utilization of geothermal resources will become the development trend of new energy utilization and an important direction of energy strategy.On the basis of the geological and hydrogeological conditions,we will use the multivariate statistical analysis method to explore the hydrogeochemical characteristics,isotope characteristics and water-rock interaction of hot springs in the area of XinYi-lianjiang deep fault?westeren Guangdong?and LuChuan-CenXi deep fault?southeastern Guangxi?and reveal the spring chemical causes.The methods used in this study include multicariate statistical analysis,as well as the characteristics,difference,correlation,ratio,proportional coefficient and strontium isotope of the hydrochemical components.The results show that the spatial distribution of the hydrochemical components was uneven,and the hydrochemical types were diverse,bicarbonate is the main type.The mineral saturation index of geothermal water in the study area shows that the minerals of anhydrite,gypsum and salt rock are unsaturated,and the minerals of calcite,dolomite,quartz and fluorite are basically saturated.Na-K-Mg diagram shows that the hot spring rock action in study area is in an unbalanced state.At the same time,the heat storage temperature and circulation depth of geothermal water are estimated,Na-K geothermometer results were higher than K-Mg geothermometer,it can be seen that the study area water to lower the temperature at which the reaction balance of water and rock,about 180?,the highest point of geothermal water in the study area in west of guangdong province the maturity of the southeast in the study area is high,and the southeast hot point in the study area more concentrated in the Mg,reach a balance of heat reservoir temperature is low.It is speculated that the geothermal system in the study area is a medium-low temperature geothermal system.This type of geothermal system is widely distributed,widely exploited and often occurs in fracture media with high thermal background value,and the geothermal water has a large circulation depth.According to the characteristics of ion ratio,the geothermal water distributed in Gaozhou City and Bobai County of Yulin City may be in a relatively open thermal storage environment with short storage time or low degree of deterioration.Most of the geothermal water in western Guangdong and the geothermal water in Rongxian and Luchan in Guangxi are in relatively closed thermal storage environment with a long occurrence time and high degree of metamorphism.The analysis results of ion concentration ratio and its proportional coefficient indicate that the water chemical components of most water samples in western Guangdong and southeastern Guangxi are mainly the dissolution control of silicate and carbonate minerals.The ion source is mainly related to the dissolution of granite minerals.Sr and its isotope results show that the ⁸⁷Sr/⁸⁶Sr values of the same type or geothermal water in the study area vary greatly,reflecting the different thermal reservoir rocks,some of which are granitic magmatic rocks,some of which are sandstone,shale or carbonic acid.Sedimentary rocks of salt rock type.Combined with the differences in hydrogeology and water chemistry characteristics of geothermal water,it reveals that the hydraulic connection between sampling points in the study area is weak.This paper analyzes and expounds the hydrogeological genesis,circulation rules and geochemical characteristics of geothermal water in the study area,and further recognizes the geothermal flow system in the study area,which has important guiding significance and reference value for sustainable utilization and rational exploration and development of geothermal water.The study on its hydrochemical composition,evolution characteristics and water-rock interaction can provide theoretical basis for the integrated utilization of this type of geothermal resources.