寿阳段王煤矿奥灰岩溶水富水性研究

A Study on Ordovician Limestone Karstic Water Yield Property in Duanwang Coalmine,Shouyang County,Shanxi Province

段王煤矿位于沁水煤田北部边缘,多年的开采已使第四系松散孔隙潜水和石炭—二叠系碎屑岩裂隙水基本疏干,区内有供水意义的含水层为奥陶系岩溶裂隙水。通过对区内奥灰岩地层岩性及富水性的分析研究,说明上马家沟组中、上段(O2s2+3)为区内的富水层段。奥灰岩水位在区内埋藏较深,静止水位为575～655m。奥灰岩溶水在垂向上表现为随着埋深的增大,岩溶发育程度减弱,富水性变弱,在水平方向上表现为北部富水性弱,南部较强的特点。奥灰水在本区西北奥灰裸露处得到降水补给后,向东南径流,途经矿区,至娘子关排泄,其水位具有逐年下降的趋势。奥灰水的变化规律通过区内两水井的抽水试验结果对比也得到了佐证。

The Duanwang coalmine is situated at north margin of the Qinshui coalfield. After many years coal mining has basically drained off Quaternary loose bed pore phreatic water and Permo-Carboniferous clastic rock fissure water, only the Ordovician karstic fissure water has water supply significance in the area. Through analytical research of Ordovician limestone lithology and water yield property, summed up its hosting pattern： middle and upper members of Upper Majiagou Formation are water rich zones in the area. Ordovician limestone water level is rather deep in the area, static level elevation is 570-571.40m. Vertically, along with buried depth increasing, karstic development extent and water yield property are weakening; horizontally, appears as weaker water yield property in the north, stronger in the south. After the Ordovieian water is precipitation recharged in the limestone outcropped area in the northwest, the runoff is toward southeast by the way of mining area and discharged into the Niangziguan area. Its water level has a descending trend year after year, the changing regularity has proofed by two wells＇ pumping tests in the area.