西部典型侏罗系富煤区地下水补径排的同位素特征

发布时间：2018-12-18 18:20

【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、静储量大等典型水文地质特征,通过野外调查,沿区域主要补给方向共采取了9个地表水及地下水样,开展了氢氧同位素及水化学分析与测试;在获取研究区水样氢氧同位素特征并首次构建哈密地区氢氧同位素降雨线的基础上,系统研究了天山东段南麓区域地下水的补径排条件;结合研究区所处的干旱区域特征及主要构造的控水作用研究,基本阐明了大南湖凹陷特殊地下水系统的形成原因及水循环条件。研究结果表明:天山东段南麓雪融水是区域地下水的惟一远程补给水源,通过深渗透方式进行补给,主径流方向为由北东向南西,补给途径长;受研究区北部沙尔湖隆起、西部及南部觉罗塔格隆起、东部边界断层等隔水构造的控制,研究区总体水文地质条件较为封闭,地下水循环交替差,进而形成了大南湖矿区上侏罗系含水层具有以静储量为主、高矿化度的特殊水文地质特征。
[Abstract]:Taking Dananhu mining area in Turpan-Hami Basin as an example, combined with typical hydrogeological characteristics of Jurassic coal-bearing strata, such as good permeability, strong water-rich and large static reserves, through field investigation, Nine surface water and groundwater samples were taken along the main recharge direction of the region. Hydrogen and oxygen isotopes and hydrochemical analysis and testing were carried out. On the basis of obtaining the hydrogen and oxygen isotopic characteristics of water samples in the study area and constructing the hydrogen and oxygen isotope rainfall lines for the first time in Hami area, the recharge and discharge conditions of groundwater in the southern foot of Tianshan Mountain are studied systematically. Based on the study of the characteristics of the arid region and the water control effect of the main structures, the formation reasons and the water cycle conditions of the special groundwater system in the Dananhu sag are explained. The results show that the snowmelt water in the southern foot of the eastern Tianshan Mountains is the only remote recharge water source for the regional groundwater. The main runoff direction is from north east to south west with a long way of recharge through the way of deep permeation. Controlled by the water-barrier structures such as the Shaer Lake uplift in the northern part of the study area, the Jolotag uplift in the west and the southern part of the study area, and the eastern boundary fault, the overall hydrogeological conditions in the study area are relatively closed, and the groundwater cycle alternate is poor. Thus, the upper Jurassic aquifer in Dananhu mining area has the special hydrogeological characteristics of static reserves and high salinity.
【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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