Vertical change characteristics of Luohe Formation aquifer in Mengcun Coal Mine
Mengcun coal mine is located in the central and western part of Binchang mining area,and the thickness of Creta-ceous Luohe Group in the mine is 253.20～388.53m.During the production and research process in the past,ultra-thick Luohe Group aquifer was regarded as a homogeneous aquifer,and pumping test was carried out in the whole section,but neg-lecting the vertical non-homogeneous characteristics of the aquifer in the Luohe Group,which resulted in the large difference between the hydrogeological parameters of the pumping test and the actual one,which affected the accurate prediction of wa-ter inflow of mine,resulting in the drainage system cannot meet the requirements.In view of this issue,it is necessary to study the hydrogeological characteristics of the Luhe Group aquifer from the vertical direction.In recent years,on the basis of the fine delineation and layered pumping test,water quality analysis test and geological cataloguing of Luohe Group aqui-fer in the mine,we have found that:on the whole,the lithology of Luohe Group sandstone aquifer has a certain depositional rhythm in the vertical direction,which shows the characteristics of the lithology change of 5 segments,and in the vertical di-rection,with the increase in the buried depth of the aquifer in the Luohu Group,the water elevation is gradually reduced,and the mineralisation gradually increases,the gradual increase of Na+,SO42-,and Cl-,representing the deep cycle retention-type,and the gradual decrease of Ca2+and HCO3-,which represent shallow-cycle retention type,and the water temperature of the boreholes increases with the depth of burial.The water-richness is strongest in the middle part of the aquifer of the Luohe Formation,followed by the upper part,and the weakest in the lower part.
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