摘要
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 paper is engaged in an exploration of the watercontented sandstone geological features of Ningtiaota Ida Nao Luo in Shenfu Mining Area. As is known,Ordos Basin is the largest coal-abundant source basin,which is also abundant in natural gas and petroleum resources,besides the coal. Ningtiaota coal mine is located in the eastern border area of the Ordos Basin,Yan＇an,Shaanxi. However,the thick layers of the sand provide a great potential of rich storage space for the underground water and makes it a great sense for safety of the coal mining in the area.What is more,Zhiluo sandstone can also serve as the main influential factor to Yan＇an coal seam at the Ningtiaota mining area and is also qualified to be distinguished in the water abundance at the pore-fracture aquifer. What is more,it can also be assumed that,if the coal mining area is located at the Zhiluo sandstone area,the roof water of the coal seam should also be permeated into the mining working face, thus, affecting the structure of the waterborne sandstone and the sedimentary aqueous features. Seeing the above said distinguished features,we have analyzed the sedimentary characteristics,the weathered sandstone features,the water-abundant sandstone evolutionary mechanism of the sandstone with the sedimentology method. Actually speaking,the evolutionary creation of such vertical strata can be divided into three surfaces,that is,the sedimentary braided river surfaces,the braided river delta surfaces,and the meandering sedimentary surfaces and lake surfaces along the river thick in sandstone. In addition,the sedimentary surfaces have been found mainly scattering in the direction from the north to the south,including the sandy river mainstream,dams and the silt sand-shale flowing flats,and the thick sand layers formed by such river course and dams,which provide good conditions for the groundwater reservoir and the biological development of the river reach. And,consequently,the sandstone of this area turns to be relatively water-abundant. Hence,the comprehensive analysis we have made can prove that there exists some certain inherent relationship between the sedimentary surface and the stratigraphic water-content abundance in Zhiluo evolution. Therefore,on the basis of hydrogeological data,the area under study can be divided into three different water-contained zones,i. e. the well-nourished water abundant zone,the medium water-contented zone and the poor watercontented zone.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第4期144-148,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(51474098)
西安科技大学青年教师培育基金项目(201607)
关键词
安全工程
地下水科学
沉积环境
砂岩含水层
富水性
safety engineering
groundwater science
sedimentary environment
sandstone aquifer
water abundance
