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Impact of Lithofacies and Structures on the Hydrogeochemistry of the Lower Miocene Aquifer at Moghra Oasis, North Western Desert, Egypt
Natural Resources Research ( IF 5.4 ) Pub Date : 2020-05-14 , DOI: 10.1007/s11053-020-09679-3
Maha Abdelazeem , Zenhom E. Salem , Mohamed S. Fathy , Maha Saleh

The Moghra Oasis is one of the major Egyptian desert-reclamation projects. Understanding the hydrochemistry of the Moghra aquifer is an onus to properly plan and manage the agricultural activities in the North Western desert of Egypt. The basic geologic structure of the area under study was deduced from a detailed land magnetic survey. The resulted magnetic field map was analyzed using different filtering techniques and tomographic inversion. Field observation, stratigraphic setting, sedimentological studies, microfacies analyses and lithologic log of the studied wells were integrated to detect the lithofacies characteristics of the Moghra aquifer. Strong vertical and lateral variations of channel-fill and flat-laminated lithofacies beside several types of diagenetic processes caused the heterogeneity of the Moghra aquifer. The direction of groundwater flow in the heterogeneous Moghra aquifer is controlled by a fault system deduced from the magnetic study. Twenty groundwater samples from around Moghra Lake were collected and were analyzed hydrochemically for major ions and trace elements. The microfacies analysis (primary components and diagenetic processes), spatial variance in pH and ions concentrations, statistical and hydrogeochemical classifications, ionic ratios and relationships and saturation indices were helpful to understand the groundwater hydrogeochemical processes. The main hydrochemical type was Na–Cl. Ion-exchange due to seawater intrusion, sulfate ion reduction, iron-oxides reduction and mineral dissolution were the detected water–rock interaction processes. Dolomite precipitation was also proven. Iron oxides, quartz and carbonate minerals precipitation in the upper saline groundwater were expected. More mineral dissolution for evaporate minerals, silicate minerals and carbonate minerals in the lower saline groundwater is expected to occur.



中文翻译:

岩相和结构对埃及西北沙漠莫格绿洲下中新世含水层水文地球化学的影响

Moghra绿洲是埃及主要的荒漠化项目之一。了解Moghra含水层的水化学是正确计划和管理埃及西北沙漠中农业活动的责任。该研究区域的基本地质结构是根据详细的陆地磁测推论得出的。使用不同的滤波技术和断层扫描反演分析了产生的磁场图。结合现场观察,地层环境,沉积学研究,微相分析和所研究井的岩性测井资料,以检测莫格拉含水层的岩相特征。除了几种成岩过程外,河道填充和扁平层状岩相的强烈的垂直和横向变化引起了莫格拉含水层的非均质性。非均质Moghra含水层中地下水的流动方向受磁研究推导的断层系统控制。收集了Moghra湖周围的20个地下水样品,并对其中的主要离子和微量元素进行了水化学分析。微相分析(主要成分和成岩作用),pH和离子浓度的空间变化,统计和水文地球化学分类,离子比率以及关系和饱和度指数有助于理解地下水水文地球化学过程。主要的水化学类型是Na–Cl。检测到的水-岩相互作用过程是由于海水入侵,离子交换减少,硫酸根离子减少,铁氧化物减少和矿物溶解引起的离子交换。白云石的沉淀也被证实。氧化铁 预计在上层盐水地下水中会有石英和碳酸盐矿物沉淀。预计在较低盐含量的地下水中会发生更多的矿物溶解,以蒸发矿物,硅酸盐矿物和碳酸盐矿物。

更新日期:2020-05-14
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