沁水煤田奥陶纪顶部相对隔水层研究

Study on Relative Aquifuge of Top Ordovician in Qinshui Coal Area

为了解放沁水煤田受底板高承压奥陶纪灰岩水威胁煤炭资源,以龙湾井田为例,采用水文地质钻探、水文地质试验、流量测井、盐化测井、应力应变渗透性全过程试验等方法,对龙湾井田奥陶纪顶部相对隔水层发育特征进行研究。结果表明,龙湾井田奥陶纪顶部沉积发育有稳定的古风化壳,奥陶纪灰岩富水性极弱、渗透率低,相对隔水层厚大于40 m,局部达120 m以上。

To exploit the coal under high stress water,the characteristics of relative aquifuge of top Ordovician in Longwan well field of Qinshui Coal Area were discussed through hydrogeological drilling,hydrogeological test,flow logging,salt logging,complete stress-strain test. The results were as following： Longwan well field developed ancient weathering crust; the water yield property was weak;the permeability was low; the thickness of the relative aquifuge was more than 40 m,and could reach 120 m above.