甘肃石油河流域地下水补给来源与演化特征分析

发布时间：2018-05-09 18:36

本文选题：地下水 + 补给来源与演化　；参考：《干旱区地理》2017年01期

【摘要】：针对石油河流域所包含的赤金盆地与花海盆地,综合利用地下水水化学指标与稳定同位素技术系统地研究了地下水的补给来源与演化规律。其中赤金盆地地下水化学演化受控于溶滤作用,方解石、白云石、石膏等不断地溶解进入低矿化度的地下水中导致Mg2++Ca2+与HCO3-+SO42-沿1∶1等量线分布;而花海盆地高矿化度地下水中的Na+与SO42-、Na+与Cl-均有较好线性关系且多数矿物饱和指数1,表明芒硝溶解控制了地下水中主要离子成分且地下水演化过程转由蒸发浓缩作用主导。赤金、花海盆地地下水氢氧同位素沿祁连山大气降水线分布或于右下方,二者特征相似,但后者更为富集重同位素,反映研究区地下水主要补给来源为祁连山大气降水或石油河河水;此外,两盆地间水力联系紧密,前者补给后者,因此在水资源开发利用时应将两盆地作为整体进行统筹管理,避免不合理开采造成环境地质问题。
[Abstract]:Aiming at the Chijin basin and Huahai basin contained in the oil river basin, the recharge source and evolution law of groundwater were systematically studied by using the hydrochemical index of groundwater and the stable isotope technique. The chemical evolution of groundwater in Chijin basin is controlled by leachate, calcite, dolomite, gypsum, and so on, which leads to the distribution of Mg2 Ca2 and HCO3- SO42- along the 1:1 isobaric line. However, there is a good linear relationship between Na and so _ 42-N _ (Na) and Cl _ (-) in high salinity groundwater in Huahai Basin, and the saturation index of most minerals is 1, which indicates that the dissolution of glauberite controls the main ionic components in groundwater and the evolution of groundwater is dominated by evaporation and concentration. The hydrogen and oxygen isotopes of groundwater in Chijin and Huahai basins are distributed along the precipitation line of Qilian Mountains or on the lower right. The characteristics of them are similar, but the latter are more enriched in heavy isotopes. It reflects that the main source of groundwater recharge in the study area is the precipitation of Qilian Mountains or the oil river water, in addition, the hydraulic relationship between the two basins is close and the former recharge the latter. Therefore, the two basins should be managed as a whole in the development and utilization of water resources. Avoid environmental geological problems caused by unreasonable mining.
【作者单位】：中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室;中国科学院大学;
【基金】：中国博士后科学基金资助项目(2016M591247)
【分类号】：P641.6

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