中文摘要：

山东省淄博市洪山-寨里煤矿相继闭坑后矿井停止抽排地下水,矿坑水水位上升并通过破损井管等水力联系通道造成奥灰水受到不同程度的污染,严重影响了当地居民的生产生活。文章详细分析了研究区地质及水文地质条件,应用水动力学并结合地下水的~（18）O、~2H以及硫酸盐~（34）S和~（18）O同位素方法,解析研究区奥灰水污染来源与途径,得出如下结论：（1）矿坑水特点为微酸性、高SO_4~（2-）和高TDS,部分奥灰水样表现出和矿坑水相似的水化学特征,指示奥灰水局部受到矿坑水污染;（2）矿区地下水主要接受大气降水补给;（3）奥灰水硫酸盐硫氧同位素组成大于砂岩水中硫酸盐同位素组成;（4）煤矿闭坑后停止抽排地下水使矿坑水水位上升,通过水力联系通道,矿坑水串层污染奥灰水;（5）矿区奥灰水受到一定的矿坑水串层污染作用,通过混合比计算,量化了矿坑水对矿区地下水的污染贡献。该研究可为矿区水污染治理提供科学依据。

英文摘要：

Ground water pollution in Zibo City arose from the shutting down of some coal mines in 1990,causing the coal strata water level to rise above the Ordovician limestone water,which led to the cross strata pollution that greatly affected the local residents.In this paper,on the basis of detailed investigation of the geology and hydrogeology conditions in the mining area,the method of ~2H,~（18 ）O isotope of water and ~（34） S,~（18）O isotope of sulfate was used to analyze the source and pathways of cross strata pollution.The results indicated that the mine drainage water with high concentrations of SO_4~（2-）and TDS was mild acidic,and part of the Ordovician limestone water had the similar characters,so implying it had been polluted by the mine drainage.Groundwater in the mining area was supplied by atmospheric precipitation;the component of ~（34 ）S,~（18）O of sulfate in Ordovician limestone water was higher than that in the sandstone water.In the wake of shutting-down of the mines,the level of mine water rose above the Ordovician limestone water causing cross strata pollution via the hydraulic connections;and（5）there were three sulfate sources of groundwater in the mining area：oxidation of sulfide,evaporation karsts solution and atmospheric precipitation,the cross strata pollution happened in part of the sandstone water and Ordovician limestone water.Furthermore,by calculation of mixing ratio,the pollution contribution of mine water to groundwater could be quantified in the mining area.