基于沉积规律的煤层顶板含水层富水性研究

Study on Water Abundance of Roof Aquifer of Coal Seam Based on Deposition Law of Formations

为了研究红庆河煤矿3-1煤顶板砂岩含水层富水性,采用沉积学原理,对矿区地层的沉积相和砂体展布规律进行了分析。在此基础上,选取地层砂地比和砂岩厚度为主控因素,运用AHP和GIS方法,对其顶板砂岩含水层富水性进行了划分。结果表明:红庆河煤矿3-1煤顶板综合富水性相对较强的区域位于井田直罗组一段古河流水动力条件较好的西北局部范围;富水性相对中等区域广泛发育于直罗组一段古河流的河漫滩及下游水动力条件较差的位置;其余区域富水性相对较弱,基本位于非古河流地区。

In order to study the water abundance of the roof sandstone aquifer of the 3-1 coal seam in the Hongqinghe Coal Mine,the sedimentary facies and the distribution of sand bodies in the mining area are analyzed by using the principle of sedimentology.On this basis,the ratio of sandstone thickness to formation thickness and the sandstone thickness were selected as the main control factors,and the water abundance of the roof sandstone aquifer was divided by using AHP and GIS methods.The results showed that the relatively richer water abundance area was located in northwest where the hydrodynamic conditions of the ancient river at the bottom of Zhiluo formation was better and the relatively medium water abundance area was widely distributed in flood plain and downstream of the ancient river with bad hydrodynamic conditions,as well as the remaining area was relatively weak,basically in the non-ancient river area.