结合地球物理方法识别构造复杂地区地下水含水层空间分布。突尼斯中部Kasserine含水层系统案例研究

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of African Earth Sciences Pub Date : 2024-11-26 DOI:10.1016/j.jafrearsci.2024.105493

Mouez Gouasmia , Hajer Azaiez , Ferid Dhahri , Karim Abidette , Hakim Gabtni , Mohamed Soussi

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引用次数: 0

摘要

许多国家都面临水资源短缺的问题。位于突尼斯中部的卡塞林地区的特点是半干旱气候，是该国受干旱影响最严重的地区之一。地下水是卡塞林地区饮用水和灌溉用水的主要来源。在这个地质复杂的地区，地下蓄水层的结构非常复杂，需要很好地描述它们的几何形状。本文旨在确定卡塞林水文地质盆地坎帕系至第四纪主要含水层的几何形态及其分布。在这项研究中，我们采用了联合地球物理方法；除了获取常规的垂直电测深外，我们还分析和解释了重力和地震现有数据。重力资料分析和填图表明，研究区为多块构造。它强调了与Megdoudech盆地和Kasserine地堑相关的两个主要负重力异常的存在。重力图显示了北西-东向卡塞林大断裂在块体构造中的作用。地震反射剖面强调了盆地的相同构造。他们揭示了导致地质构造分区的断层网，断层网在该地区含水层系统的水动力学中起着重要作用。地电学研究表明，卡塞林地堑中存在3个含水层单元：上第四纪砂质-砂质粘土层、中中新世砂岩层（在不同深度剖面上平均电阻率为75 Ω m）和坎帕尼亚石灰岩层（在卡塞林高原上具有高电阻率）。事实证明，这种综合方法对了解这种地质复杂地区的地下水分布非常有用。研究结果将有助于决策者确保地下水资源的安全管理，特别是在半干旱和干旱地区。

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Combined geophysical approach as a tool to identify spatial groundwater aquifer distribution in structurally complex area. Case study of Kasserine aquifer system (central Tunisia)

Many countries are facing water resource scarcity. The Kasserine region in central Tunisia, is characterized with semi-arid climate and it is one of the most affected areas by drought in the country. Groundwater constitutes the main resource for drinking and irrigation water in Kasserine region. The groundwater aquifer levels are very structured, in this geologically complex zone, and their geometry needs to be well characterized. The present study aims to identify the geometry and the distribution of Campanian to Quaternary main aquifers in the Kasserine hydrogeological basin.

In this study, we adopted a combined geophysical approach; we analyzed and interpreted gravity and seismic existent data in addition to acquiring conventional vertical electrical soundings. The gravity data analysis and mapping revealed that the study area is structured in numerous geological blocks. It highlighted the existence of two major negative gravity anomalies associated with the Megdoudech basin and the Kasserine graben. The gravity maps illustrated the role of the NW-SE Kasserine major Fault in the block structuring. The seismic reflection sections have emphasized the same structuring of the basins. They have exposed the fault network responsible for the compartmentalization of geological structures and which plays an important role in the hydrodynamics of the aquifer system in the region. The geoelectrical investigation highlighted the existence of three aquifer units: the sandy to sandy-clay levels of the Plio-Quaternary in the Kasserine graben, the sandstones of the middle Miocene with an average resistivity of 75 Ω m profiled at different depths, and the Campanian limestones with high resistivities in the Kasserine plateau.

This combined approach is proven to be very useful to understand groundwater distribution in such geologically complex zones. The results will help the decision makers to ensure the safe management of groundwater resources especially in semi-arid and arid regions.

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来源期刊

Journal of African Earth Sciences 地学-地球科学综合

CiteScore

4.70

自引率

4.30%

发文量

240

审稿时长

12 months

期刊介绍： The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.