华北型煤田中奥陶统碳酸盐岩古风化壳天然隔水性能评价方法与应用

随着开采深度逐渐加大和下组煤逐步回采,华北型煤田的中奥陶统碳酸盐岩(局部寒武系)底板突水问题和浅部上组煤大批关闭煤矿老空水对下伏岩溶水的越流(串层)污染问题日趋严重。通过对山东兖州煤田中部矿区大量地质勘探资料的系统整理、统计与分析,从中奥陶统灰岩顶部古风化壳厚度、岩性特征、钻孔岩芯采取率、冲洗液消耗量、裂隙发育情况和充填压实程度、构造发育等多方面开展了其隔水性能的综合研究,建立了刻画其隔水性能的指标体系,运用GIS强大的数据管理与空间分析功能和信息融合技术,创建了面向GIS的信息融合型隔水性能评价方法——隔水性指数法,提出了古风化壳隔水性能评价的技术路线和具体工作程序,并进行了示范工程的实际应用。

Impermeability evaluation method and its application on the ancient weathering crust of carbonatite in Middle Ordovician system in North China coalfield

With the gradual increase in mining depth and the lower coal seam group mining in North China coalfield，the problems of water inrush into coal mine from the Ordovician carbonatite aquifer underlying the coal seam group and the goaf water flow pollution to the Ordovician carbonatite aquifer are growing seriously.According to systematic statistics and analysis of a large number of geological exploration data in the central coalfield of Yanzhou Shandong Province，author carried out a comprehensive study of the ancient weathering crust impermeability from the weathering crust thickness，drilling core recovery rate，drilling fluid consumption，weathering fracture development and filling degree，geological tectonic development and other aspects of the Middle Ordovician limestone，and established the indicator system to characterize its impermeability，and applied the powerful data management and spatial analysis functions of GIS and information fusion technology to create a GIS-oriented information fusion impermeability evaluation method—aquifuge index method，and put forward technology roadmap and specific work procedures of the aquifuge index method，and has applied the method to a real project.