王坡井田峰峰组顶部岩层隔水性研究

Study on Impermeability of Top Strata of Fengfeng Formation in Wangpo Well Field

为了解放王坡井田下组煤受奥陶纪灰岩水威胁的煤炭资源,在华北地层奥陶系顶部存在隔水层理论基础上,采用水文地质钻探、抽水试验、盐化测井、压水试验、钻孔窥视试验等多种手段相结合的方法,对王坡井田峰峰组顶部岩层隔水性进行分析研究。结果表明:王坡井田峰峰组顶部岩层发育有稳定的古风化壳,顶部灰岩富水性极弱、渗透性较差、裂隙不发育,可作为相对隔水层考虑。

To release the lower coal seams of Wangpo Well Field being threatened by Ordovician karst water, based on the theoretical basis that there is an aquifer at the top of the ordovician system in North China, using hydrogeological drilling,pumping water testing, salinity logging, water pressure testing, drilling and peep tests and other ways, the water permeability of top strata of Wangpo Well Field Fengfeng formation is analyzed and studied. The results show that the top strata of Fengfeng formation in Wangpo Well Field has a ancient weathering crust with weak water yield property, low permeability, less cracks, which can be considered as a relative aquifer.