摘要
鄂尔多斯盆地呼吉尔特矿区属于"水压高、水量大、富水性不均一"的深埋侏罗纪煤田区,各矿井面临较严重的水害防治压力,为了弄清该地区矿井涌水特征及其沉积控制条件,开展了沉积相与顶板钻孔出水层位、钻孔涌水量、工作面涌水量等方面的相关性研究,结果表明:呼吉尔特矿区导水裂缝带范围内,主要发育曲流河沉积相的延安组真武洞砂岩段和直罗组七里镇砂岩段,岩性为细粒–中粗粒砂岩。直罗组早期发育了一套河流相沉积,对延安组顶部的强烈冲刷侵蚀,导致矿区中部的门克庆、母杜柴登井田范围内2^-1煤层缺失,并形成了较厚的七里镇砂岩段;矿区两侧的2^-1煤层较完整,其上覆七里镇砂岩较薄。七里镇砂岩含水层是工作面回采过程中的最主要充水含水层,各矿井的工作面顶板疏放水钻孔涌水量差异显著,古河床冲刷带中部的矿井钻孔涌水量普遍大于古河床冲刷带两侧,与顶板地质沉积相有较好的对应关系。煤层顶板地质条件(沉积相)的差异性,控制了各矿井工作面回采过程中涌水量大小;直罗组古河流冲刷带两侧广泛发育的富水条带,则影响工作面涌水量的变化规律。
Hujirt mining area in Ordos basin is a deep-buried Jurassic coalfield with high water pressure,large water volume and uneven water abundance.Each mine is facing serious pressure of mine water hazard prevention and control.In order to clarify the water outflow conditions and main controlling factors of the coal seam roof of the mine in this area,the research on geological deposit and water-producing horizon of roof boreholes,water-inrush from boreholes and water-inrush from working face was carried out.The results showed that within the water conducting fractured zone of Hujirt mining area,there are mainly meandering river sedimentary facies in Zhenwudong sandstone section of the third Member of Yan’an Formation and Qilizhen sandstone section of the first Member of Zhiluo Formation.The lithology of these two sections is fine-medium-coarse sandstone.In the early stage of the Zhiluo Formation,a set of fluvial facies deposits developed,which resulted in erosion of Yan’an Formation.coal seam 2^-1 was missing in the Menkeqing and Muduchaideng minefields in the middle of the mining area,and the thickness of Qilizhen sandstone section is large.However,the coal seam 2^-1 on both sides of the mining area is relatively preserved,and the sandstone thickness in Qilizhen is relatively thin.The water inflow from pre-drainage boreholes in coal working face roof mainly came from Qilizhen sandstone aquifer,and there are significant differences in water inrush from bore holes in different mines.The water inflow from boreholes in the middle of the scouring zone of paleao river bed is larger than that from boreholes on both sides of the scouring zone of paleao river bad,which corresponds well to the geological sedimentary facies of the roof.The difference of geological conditions(sedimentary facies)of coal seam roof not only controlled the amount of water inflow in the mining process,but also affected the variation law of water inflow in the working face.
作者
梁向阳
杨建
曹志国
LIANG Xiangyang;YANG Jian;CAO Zhiguo(Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China;Shaanxi Key Laboratory of Preventing and Controlling Coal Mine Water Hazard,Xi’an 710077,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 102211,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2020年第1期138-144,共7页
Coal Geology & Exploration
基金
国家自然科学基金项目(41302214)
煤炭开采水资源保护与利用国家重点实验室开放基金项目(SHJT-16-30.10)
中煤科工集团西安研究院有限公司科技创新基金项目(2018XAYMS03)。
关键词
富水性
七里镇砂岩含水层
涌水量
主控因素
沉积相
呼吉尔特矿区
aquifer water richness
Qilizhen sandstone aquifer
water inflow
main controlling factors
sedimentary facies
Hujirt mining area
