基于多源空间信息融合的含水煤层顶板复合岩层富水性分区

Multi-source spatial information fusion-based water abundance zoning of the composite layer of water-bearing seam roof

侏罗系煤田煤层开采普遍受到顶板复合含水层水影响。选取陕北榆横矿区袁大滩煤矿2煤开采顶板复合砂岩地层为研究对象,基于经验公式和实测公式,计算导水裂缝带发育高度,确定2煤至直罗组顶界为富水性分区范围;选取评价层段砂岩等效厚度、砂–泥互层特征等7个岩性结构指标,重点考虑2煤含水性特征,计算了各钻孔位置富水性综合指数,借助Arcgis软件,绘制了研究区富水性分区图,揭示区内富水性从西北向东南递减,与区域富水性背景一致。研究结果对于富水性指数法在煤层含水条件下的应用有推动作用。

Coal mining in Jurassic coalfield is generally threatened by roof water.The composite sandstone of No.2 coal seam in Yuandatan coal mine located at North Shaanxi was selected as research object,and the development height of water-conducting fracture zone was calculated using the empirical formula and measurement formula respectively,based on the calculated results,it was determined that the range for water abundance zoning was from the No.2 coal seam to the top boundary of Zhiluo Formation.According to the previous studies,we selected seven factors such as the equivalent thickness of sandstone,the property of interbed of sandstone and mudstone,the water content of the No.2 coal seam,the unit water inflow,the permeability coefficient,the core-recovery,and the thickness ratio of brittle and plastic rock to calculate the comprehensive water abundance index at borehole location.The zoning plan of water abundance in the study area was generated using the Arcgis software,and the plan indicated that the water abundance decreased gradually from the northwest to the southeast and was consistent with the regional background value.The research results have positive effect for the application of the water abundance index method in the conditions of water-bearing coal seam.