Analysis Of Geothermal Distribution And Influencing Factors In The Sudong Mining Area

In order to research regularity of geothermal distribution at the Sudong Mining Area,according to ground borehole thermometric data at the mining area and tunnel borehole thermometric data,and combined with the Geothermics and Tectonic geology theory and studies of related scholars.Analyze the characteristics of geothermal distribution and the factors of main effect at the Zhuxianzhuang mine and Luling Mine of study area.Numerical simulation of the 11 exploration line profile of Zhuxianzhuang mine by COMSOL Multiphysics finite element software and prediction range of thermal region,and calculate the amount of geothermal resources at the Sudong Mining area.The main findings are as follows:(1)The study area has normal geothermal.Whole mining area geothermal gradient value between 2.06 ?/hm to 2.86?/hm,the geothermal distribution and the depth of the research area has a good linear relationship:T =-0.0234H +23.54,and its average geothermal gradient is 2.34 ?/hm.(2)The-435m horizontal of Zhuxianzhuang coal seam mining that temperature value between 25.74?and 29.19?,the average value is 27.83?,The-700m level temperature value between 31.19?and 36.77?,the average value is 34.57?,the-1000m level temperature between 37.36?and 45.34 ?,the average value is 42.20?.The depth is more than 498m as one grade high temperature zone,the depth is more than 708m as two grade high temperature zone;The-400m horizontal of Luling coal seam that temperature value between 24.9? and 27.19?,the average value is 26?,the-590m level temperature value between 28.75?and 32.14?,the average value is 30.37?.The-900m level temperature value between 35.03?and 40.22?,the average value is 37.51 ?.The depth is more than 546m as one grade high temperature zone,the depth is more than 776m as two grade high temperature zone.(3)The geothermal distribution in study area is mainly controlled by tectonic,Sudong Mining Area is located in the hanging wall of nappe of XuSu.Due to the fault property is compressive fault,so the fault has adiabatic effect,therefore,the geothermal gradient in Sudong mining area is lower than the fault footwall,it is lower than adjacent mining area;The study area deep the rock has good performance of heat conduction,geothermal conduction speed is faster,so the present geothermal gradient is relatively low,the shallow stratum is covered by]oose bed,while the conductivity of loose bed is low,thermad conductivity is poor,so near surface has high geothermal gradient;magmatic age in the study area is Yanshanian,almostly magmatic residual heat completely lost,therefore it had little effect on the geothermal distribution;the hot water rise in the extensional and compressional fracture junction place or underground hot water in the relatively closed area will cause local area geothermal anomaly.(4)On the above elevation of-800m in Zhuaxianzhuang coal mine of geothermal resources quantity:Qr1 =1.141 × 109kJ;On the above elevation of-800 m in Luling coal mine geothermal resources quantity:Qr2=1.562 × 109kJ,so on the above elevation of-800 m in Sudong Mining Area geothermal resources quantity:Qr=Qr1?Qr2=2.703×109kJ.