摘要
侏罗系煤田顶板复合含水层具有厚度大、富水性不均一的特点,煤层开采驱动下导水裂隙带发育至不同含水层构成的水害威胁程度不同。彬长矿区位于鄂尔多斯盆地侏罗系煤田南缘,顶板白垩系洛河组砂岩含水层富水性差异较大,对其富水性进行精确评价成为矿区防治水工作开展的重要前提。以矿区内某矿井为例,选取对含水层富水性影响较大的含水层厚度、冲洗液消耗量、岩心采取率、砂泥岩层比率、含水层埋深、矿化度6个主控因素作为评价指标,采用模糊层次分析法确定各主控因素的主观权重,利用标准差对主观权重进行修正,建立含水层富水性评价指数模型,对研究区洛河组砂岩含水层富水性进行评价,并通过勘探钻孔抽水试验成果对富水性评价结果进行验证。结果表明,研究区内洛河组强富水区集中在西北侧,中等富水区分布在研究区中部,弱富水区分布在东南侧,富水性自西北向东南逐步递减,基于标准差修正主观权重的洛河组含水层富水性评价方法提高了预测结果的可靠性和准确性,分区结果可为该区洛河组含水层防治水工作提供指导。
The composite aquifer of Jurassic coalfield roof has the characteristics of large thickness and uneven water richness.Under the driving of coal seam mining,the water-conducting fracture zone develops to different aquifers,and the degree of water damage threat is different.Binchang mining area is located in the southern margin of Jurassic coalfield in Ordos Basin.The water-rich of sandstone aquifer in roof of Cretaceous Luohe Formation varies greatly.Accurate evaluation of water-rich is an important prerequisite for water control in mining area.Taking a mine in the mining area as an example,six main control factors,such as aquifer thickness,flushing fluid consumption,core recovery rate,sand-mud rock ratio,aquifer depth and salinity,which have great influence on the water-rich of aquifer,are selected as evaluation indexes.The fuzzy analytic hierarchy process is used to determine the subjective weight of each main control factor,and the standard deviation is used to correct the subjective weight.The evaluation index model of aquifer water-rich is established to evaluate the water-rich of sandstone aquifer in Luohe Formation in the study area.The results show that the strong water-rich area of Luohe Formation in the study area is concentrated in the northwest side.The medium water-rich area is distributed in the middle of the study area,and the weak water-rich area is distributed in the southeast.The water-rich gradually decreases from northwest to southeast.The water-rich evaluation method of the Luohe Formation aquifer based on the standard deviation correction subjective weight improves the reliability and accuracy of the prediction results.The zoning results can provide guidance for the water prevention and control of the Luohe Formation aquifer in this area.
作者
李盼盼
侯恩科
姬亚东
Li Panpan;Hou Enke;Ji Yadong(College of Geology and Environment,Xi′an University of Science and Technology,Xi′an 710054,China;Xi′an Research Institute(Croup)Co.,Ltd.,China Coal Technology and Engineering Group,Xi′an 710077,China;Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology in Shaanxi Province,Xi′an 710077,China)
出处
《能源与环保》
2023年第10期25-31,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金面上项目(41472234)
陕西省联合基金项目(2021JLM-09)。
