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中文摘要：
为探索华北石炭二叠纪煤炭资源，特别是大量受奥灰水威胁的“下组”煤的安全开采问题，根据“奥陶系顶部存在隔水层并可作为隔水关键层”的观点，通过对新驿煤田奥灰顶部岩性、裂隙岩溶充填情况及钻探漏水、测井出水段等各方面的综合研究措施，论证奥灰顶部相对隔水性。在此基础上，分析并评价煤层底板阻水能力的主要影响因素，并对影响下组煤开采的底板奥灰突水危险性进行分区评价。研究结果为新驿煤矿区下组煤开采的防治水工作提供了参考。将奥陶系顶部相对隔水层作为整个煤层底板隔水层的一部分进行底板突水危险性评价，可以使评价结果更准确。
英文摘要：
In order to explore the safety mining of Carboniferous-Permian coal resources, especially a great deal of lower coal seams being threatened by Ordovician karst water, relative impermeability of Ordovician top is demonstrated through studying lithology, filling degree of the karst fissures as well as water leakage of drilling fluid and aquifer shown in well logging based on the viewpoint that water-resisting strata exist in Ordovician top and can be considered as water-resisting key strata. Furthermore, the main influencing factors on impermeability of coal seam floor are analyzed; and divisional risk assessment of floor water-inrush from Ordovician karst is performed. Overall, accuracy of risk assessment on floor water-inrush can be improved by considering the relative water-resisting strata in Ordovician top as part of the whole ones.
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