The integration of satellite gravity data and ground electrical resistivity methods for groundwater exploration, White Nile State, Sudan

IF 1.827 Q2 Earth and Planetary Sciences
Abdalla E. M. Elsheikh, Sami O. H. El Khidir, Azam A. Abdel Gadir
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引用次数: 0

Abstract

The study is carried out in selected vulnerable localities in terms of shortage in water supply in the White Nile State, Sudan, which include El Salam, Guli, and El Gabalain localities. These locations are either situated on basement rocks or dominated by thick clayey deposits within the NW-trending isolated sedimentary rift basins. The primary goal of this study is to explore the groundwater potential zones in the selected areas. The methods of investigations are based on the integration of the processed satellite gravity data with the ground electrical resistivity survey using winner and Schlumberger configurations. The interpretation of satellite gravity data were done through the Residual Bouguer Anomaly (RBA) and second vertical derivatives (SVD) to define the configuration of the sedimentary basins as water-bearing formations. The high-density rocks are attributed to the basement rocks, where the low-density rocks are related to the sedimentary sequences in the (RBA) maps. The faults, plains, and deep fractures are delineated as sharp boundaries between different gravity anomalies in (VSD) maps. The conducted geo-electrical surveys were done on the gravity data findings, detecting the lateral and vertical variations of sub-surface geology that help to highlight the groundwater occurrences. The high resistivity values ≥ 200 Ώ m refer to the occurrences of basement rocks; the medium resistivity values 20–200 Ώ m refer to the aquifer zones, while the low resistivity values of ≤ 20 Ώ m refer to clayey sediments or to saline water in the region.

结合卫星重力数据和地面电阻率方法进行地下水勘探,苏丹白尼罗州
本研究在苏丹白尼罗州选定的易受影响的供水短缺地区进行,其中包括El Salam、Guli和El Gabalain地区。这些位置或位于基底岩上,或以北西向孤立沉积裂谷盆地内的厚粘土矿床为主。本研究的主要目的是在选定的地区勘探地下水潜力带。调查方法基于处理后的卫星重力数据与使用winner和斯伦贝谢配置的地面电阻率测量相结合。通过残差布格异常(RBA)和二次垂向导数(SVD)对卫星重力数据进行解释,确定沉积盆地为含水构造。高密度岩属于基底岩,而低密度岩则与(RBA)图中的沉积层序有关。断层、平原和深裂缝在VSD图中被描绘成不同重力异常之间的清晰边界。对重力数据进行地电测量,探测地下地质的横向和垂直变化,有助于突出地下水的产状。≥200 Ώ m的高电阻率值为基底岩产状;中电阻率值20 ~ 200 Ώ m为含水层,低电阻率值≤20 Ώ m为该地区粘土质沉积物或咸水。
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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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