Research On Occurrence And Influencing Factors Of Radon In Cambrian Limestone Geothermal Water

In order to study the occurrence and influence factors of radioactive element radon in Cambrian limestone geothermal water of thirteen mine in Pingdingshan coalfield,the geothermal water temperature,radon content,pH value,TDS,electrical conductivity and conventional ion concentration were measured in typical locations.The data are analyzed by trigonometric graph,correlation analysis and fractal theory,and the following research results are obtained.?1?The underground hot water in the study area may come from a hotter environment,which is diluted by shallow water in the process of rising from hot water to the surface.The geothermal water in this area belongs to the peripheral water.The TDS content of the water samples is not very different.Basically,they belong to class III water.The main types are Na-Ca-Mg-SO₄-HCO₃ type and Na-Ca-HCO₃-SO₄ type.They belong to the micro mineralized hot water.The quartz-no steam loss geothermometer to calculate the temperature of the reservoir,between the temperature between 65.57⁷0.97 DEG C.Pingdingshan Coal Mine thirteen Cambrian limestone water cycle depth is between 1368m¹518m,the average depth is 1436m.?2?The study area of geothermal water recharge elevation is-156m²99m,the supply source is flat thirteen coal mine in the northwest of the Cambrian limestone shallow buried area,river and Ru precipitation through the overlying four loose layer of vertical infiltration.The average temperature of the geothermal water supply area is 7.72.The velocity of groundwater runoff is relatively fast,and the time of detention in the aquifer is relatively short,which is stronger with the new alternation effect.?3?In addition,the distribution characteristics of radon and the relationship between radon and its influencing factors are analyzed.The results show that the radon content has three mining area of Cambrian limestone water in four mining area has a mean 89.34Bq/L,mean 13.90Bq/L,has three mining area radon content is higher than four mining area;geothermal water radon content positively associated with Cl^-,SO₄^2-and Ca²⁺and the content of pH was negatively related with radon content;temperature high zone,radon and radium in the rock leaching rate is high,radon and radium in water transfer more quickly,the radon content in geothermal water is higher;the vertical migration of radon radioactive decay process and control the aquifer under pressure,the greater the depth of geothermal water,radon content is higher;the fractal the theoretical evaluation results show that the complexity of the fault,the fault is more complex,more broken rock,the more content of radon and radium in groundwater in strata,the radon content is greater.