WATER ABUNDANCE OF RED BEDS IN TENGXIAN-YANZHOU COALFIELD AND ITS EFFECT ON COAL MINING

Upper Jurassic red bed,covering directly on coal-measure strata of Permian and Carboniferous System in Tengxiom-Yanzhou coal bearing Basin,was regarded as a aquifuge in exploration stage.In this paper a systematicalty study of chemical and mineralogical compositions of red beds,water-storing space and distribution pattern in red bed,and effect of groundwater on coal production is made by mean of analysis of exploration and laboratory data.Then the authors reach a conclusion that the red bed can store plentiful ground water in some suitable areas with lithologic and structural conditions due to development of pores、fissures and karst cavers.Groundwater in red bed is not only water supply for many mines,but can also threaten coal production as it is an important source for filling mine shaft and often bursting from mining-induced fissures in mine workings.