HYDROGEOCHEMICAL CHARACTERISTICS OF MAIN WATER FILLED AQUIFERS AND SOURCE INDICATORS OF MINE WATER IN TYPICAL JURASSIC MINE AREA OF WESTERN CHINA

Based on the theory of the hydrogeochemistry,the hydrochemistry and environmental isotope basic eigenvalues of different aquifers overlying the coal seam in the Yushen mining areas were established. On this basis,the mine water sources of shallow buried mines,mid-deep buried mines,and deep buried mines were identified combined with the hydrogeological structures and heights of water conducting fracture zone of typical mines. Results showed that,the hydrochemical types and environmental isotope values of different aquifers overlying the coal seam were obviously different affected by the water-rock reactions and hydrodynamic condition. With the increase of the buried depth of coal seam,the salinity of mine water showed a significant increasing trend,while the δD and δ¹⁸ O of mine water showed a decreasing trend. And then the source of mine water for coal mines of different buried depth coal seam was identified by applying comprehensive hydrochemistry and stable isotope. It was considered that the mine water for shallow buried coal mines was a mixture of the groundwater for the Jurassic sandstone aquifer and the Quaternary loose aquifer. And the mine water for deep and mid-deep buried coal mines mainly came from the Jurassic sandstone aquifer.