摘要
陕北侏罗纪煤田榆横北区内煤炭资源丰富,但区内矿井普遍受到顶板水害影响。为了区内矿井后期水文地质和防治水工作的高效开展,以巴拉素井田先期开采地段为例,通过对矿井未来首采的2号煤顶板直接充水含水层进行沉积环境分析,以此掌握其赋存特征。结果表明:2号煤顶板的侏罗系直罗组和延安组第四段含水层主要形成于弱还原-还原沉积环境,具有平行层理、槽状交错层理、过渡性层理、冲刷面等沉积构造;直罗组沉积由河道砂坝和河漫滩构成,古河道呈北西-南东向展布;延安组第四段沉积微相以分流河道和分流间洼为主,分流河道呈北东-南西方向展布。
There are abundant coal resources in northern of Yuheng Mining Area of Jurassic coalfield in northern Shaanxi,but the coal mines in this area are generally affected by roof water hazards.In order to carry out the hydrogeology and water prevention control work efficiently in the later stage of the coal mine in this area,taking the early exploitation area of Balasu Coal Field as the example,the sedimentary environment of No.2 coal seam roof aquifers directly filled with water for the first mining in the future is analyzed to grasp its occurrence characteristics.The results show that the aquifers of Jurassic Zhiluo Formation and the fourth section of Yan’an Formation of No.2 coal roof are mainly formed in the weak reduction-reduction sedimentary environment.There are sedimentary structures such as parallel bedding,slot-like cross-bedding,transitional bedding,erosion surface,etc.The Zhiluo Formation is composed of the channel sand bank and floodplain,and the ancient channel spreads from NW to SE.The sedimentary microfacies in the fourth section of the Yan’an Formation are mainly distributary channel and distributary interval depression,and the distributary channel spreads in the direction from NE to SW.
作者
徐圣集
刘洋
方刚
XU Shengji;LIU Yang;FANG Gang(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Shaanxi Yanchang Petroleum Balasu Coal Industry Co.,Ltd.,Yulin 719000,China;China Coal Technology and Engineering Group Xi’an Research Institute,Xi'an 710077,China;Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology,Xi'an 710077,China;School of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤矿安全》
CAS
北大核心
2020年第7期221-227,共7页
Safety in Coal Mines
基金
国家重点研发计划资助项目(2017YFC0804100)
国家自然科学基金资助项目(41807221)。
关键词
侏罗纪煤田
榆横北区
巴拉素井田
沉积特征
含水层
Jurassic coalfield
northern Yuheng Mining Area
Balasu Coal Field
sedimentary characteristics
aquifers
