西部典型侏罗系富煤区含水介质条件与水动力学特征

发布时间：2019-02-16 07:25

【摘要】：以位于吐哈盆地的大南湖矿区为例,结合该区侏罗系含煤地层渗透性好、富水性强、静储量大等典型特征,采用现场取样、压汞实验、扫描电镜等手段,系统研究了侏罗系西山窑组含水层的沉积环境、宏观地层结构、细观孔隙结构等含水介质特征;通过现场抽水试验及室内数据处理分析,研究了该含水层的循环条件及水动力特征。结果表明:研究区侏罗系含水层具有典型的隐伏古湖床沉积环境及高孔隙度、强渗透性、"孔隙-裂隙"双重含水介质共存的特殊水文地质结构特征;区域上,侏罗系含水层补给水源充沛,结合侏罗系含水层的双重介质特征,表现出具有明显滞后效应的水动力学特征,通过Boulton模型对水文地质参数进行校正,经现场试验,更符合该区地下水运动的实际规律。研究成果初步揭示了吐哈盆地富煤区由于地质沉积环境及岩性差异所导致的侏罗系含水介质结构及地下水动力场的特殊性。
[Abstract]:Taking Dananhu mining area in Turpan-Hami Basin as an example, combined with the typical characteristics of Jurassic coal bearing strata in this area, such as good permeability, strong water enrichment and large static reserves, field sampling, mercury injection experiment and scanning electron microscope were used. The characteristics of water-bearing medium, such as sedimentary environment, macro-stratigraphic structure and meso-pore structure of the Xishanyao formation aquifer in Jurassic system, are systematically studied. The circulating conditions and hydrodynamic characteristics of the aquifer are studied by field pumping test and laboratory data processing. The results show that the Jurassic aquifer in the study area is characterized by a typical sedimentary environment of concealed paleolake bed, high porosity, strong permeability and coexistence of "pore and fissure" water bearing medium. In the region, the Jurassic aquifer has abundant recharge water sources, combined with the dual media characteristics of the Jurassic aquifer, showing the hydrodynamic characteristics with obvious hysteresis effect. The hydrogeological parameters are corrected by Boulton model and tested in the field. It also accords with the actual law of groundwater movement in this area. The research results reveal the particularity of Jurassic water-bearing medium structure and groundwater dynamic field caused by the difference of geological sedimentary environment and lithology in coal-rich area of Turpan-Hami Basin.
【作者单位】：中国矿业大学资源与地球科学学院;徐矿集团公司;
【基金】：国家重点基础研究发展计划(973)资助项目(2013CB227901) 国家自然科学基金资助项目(41502282) 江苏高校优势学科建设工程资助项目
【分类号】：P641.461

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