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柠条塔井田内的直罗组砂岩层属于孔隙裂隙含水层且富水性差异较大,若煤层采动区域位于直罗组砂岩富水性强的区域,顶板水害直接威胁矿井安全生产。采用沉积学方法分析了柠条塔井田直罗组砂岩的沉积特征、直罗组顶部风化砂岩特征、直罗组砂岩的富水规律,并对柠条塔井田内的直罗组砂岩富水性进行了分区。结果表明,直罗组地层在垂向上分为3段,为辫状河沉积相、辫状河三角洲沉积相、曲流河沉积相和滨浅湖沉积相;直罗组沉积相以砂坝和粉砂-泥质河漫、砂质河道骨架为主,表现为南北向分布。其中,能够为地下水提供较好储存空间的主要是砂质河道及砂坝发育的厚度较大的砂岩层,此地段的砂岩富水性相对较强。直罗组砂岩厚度越大,富水性越强。研究表明直罗组沉积相与地层的富水性之间存在一定的内在联系。根据砂体的展布规律将研究区划分为富水性不同的3个区(强、中等和弱)。
The Zhiluo Formation sandstone in the limestone tower minefield belongs to pore-fissured aquifer and has great difference in water-richness. If the mining area of coal seam is located in a strong water-rich sandstone area of Zhiluo Formation, water hazard directly affects the mine safety production. Sedimentology was used to analyze the sedimentary characteristics of the Zhiluo Formation sandstone in Zhitongtai Mine, the characteristics of the weathered sandstone at the top of Zhiluo Formation and the water-rich regularity of sandstone in Zhiluo Formation, and the water-richness of sandstone in Zhiluo Formation Partition. The results show that the strata of Zhiluo Formation are vertically divided into three sections, that is, braided river sedimentary facies, braided river delta sedimentary facies, meandering river sedimentary facies and shore-shallow lake sedimentary facies. The sedimentary facies of Zhiluo Formation are sand bar and Silt - muddy river, sandy channel skeleton, showing the distribution of north-south. Among them, the sandstone reservoirs, which are capable of providing better storage space for groundwater, are mainly sandy river courses and sand bars, and the sandstone in this area is relatively water-rich. Zhiluo sandstone the greater the thickness, the more water-rich. The research shows that there is a certain intrinsic relationship between the sedimentary facies of Zhiluo Formation and the water-richness of the strata. According to the distribution law of sand body, the study area is divided into three areas (strong, medium and weak) with different water-richness.