Interpretation of Geometric Elements of the Fahs Aquifer System, Northeast Tunisia: Joint Use of Vertical Electrical Sounding Data, Well Logs and Satellite Imagery

Hezzi, M. F.; Guellala, Rihab; Ferjani, Asma; Ferchichi, Y.; Merzoughi, A.; Inoubli, Mohamed Hédi

doi:10.1007/s11053-020-09737-w

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…(Ebong et al, 2014;Madun et al, 2018;Oudeika et al, 2021;Alao et al, 2022;Mohamed et al, 2023a;Taha et al, 2021). These methods are typically implemented in exploratory studies to install groundwater wells (Hezzi et al, 2021). VES is the most popular resistivity technique for defining potential groundwater zones and calculating hydraulic parameters such as transmissivity and hydraulic conductivity (Arétouyap et al, 2019;Mohammed et al, 2023e;Omeiza et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian Aquifer system using geophysical methods

Mohammed,

Mohamed,

Szabó

et al. 2024

Front. Earth Sci.

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The recent research aims to investigate the petrophysical and hydrogeological parameters of the Nubian aquifer system (NAS) in Northern Khartoum State, Sudan, using integrated geophysical methods, including surface electrical resistivity and geophysical well-logging. The Nubian aquifer is a transboundary regional aquifer that covers vast areas in Sudan, Egypt, Libya and Chad. The well-logs, including self-potential (SP), natural gamma ray (GR), and long normal resistivity (RS), are integrated with Vertical Electrical Sounding (VES) measurements to delineate the hydrostratigraphical units. As a result, two aquifers are detected. An upper aquifer comprises coarse sand with an average thickness of 50 m and a lower aquifer of sandstone with more than 200 m thickness. For a thorough evaluation of the aquifers, in the first stage, the petrophysical and hydrogeological parameters, including formation factor, total and effective porosity, shale volume, hydraulic conductivity, and transmissivity, are measured solely from geophysical well-logs. In the second step, the results of geophysical well logs are combined with VES and pumping test data to detect the spatial variation of the measured parameters over the study area. As a result, the hydraulic conductivity of the Nubian aquifers ranged from 1.9 to 7.8 m/day, while the transmissivity varied between 120 and 733 m2/day. These results indicated that the potentiality of the Nubian formation is high; however, in some regions, due to the sediment heterogeneity, the aquifers have intermediate to high potential. According to the obtained results, it can be concluded that the Nubian Aquifer in Khartoum state is ideal for groundwater development. This research discovered that geophysical approaches can be used to characterize moderately heterogeneous groundwater systems by comparing the Nubian aquifer with similar aquifer systems that have similar hydrogeological settings. This study emphasized the application of universal principles in extrapolating hydraulic parameters in hydrogeophysical surveys. This approach aims to reduce the costs and efforts associated with traditional hydrogeological approaches.

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Section: Introductionmentioning

confidence: 99%

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian Aquifer system using geophysical methods

Mohammed,

Mohamed,

Szabó

et al. 2024

Front. Earth Sci.

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“…Hydrogeological investigations frequently use non-invasive methods of surface electrical resistivity. These methods are typically implemented in exploratory investigations to install groundwater wells to prevent breakdowns, typical for wells constructed using geological data or nearby existing boreholes (Hezzi et al 2021). Vertical electrical sounding is the most popular resistivity pro ling approach for de ning potential groundwater zones and calculating hydraulic parameters (Arétouyap et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian aquifer by combining geophysical and hydrogeological methods: a case study of Khartoum state, Sudan

Mohammed

Szabó

Szűcs

2023

Preprint

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This research follows an integrated approach for delineating subsurface lithology and estimating petrophysical and hydrogeological parameters of the Cretaceous Nubian formation aquifer in Khartoum state, Sudan. The Nubian aquifer is a fossilized transboundary regional aquifer that covers more than a quarter of the Sudan’s area. The integrated approach includes geophysical well-logging, surface geophysical electrical methods, and pumping data analysis. Geophysical well-logs, including self-potential (SP), natural gamma ray (GR), and long normal resistivity (RS) for with the aid of described lithological logs are employed to delineate the transboundary Nubian aquifer, and the obtained results are extrapolated by vertical electrical sounding (VES) and boreholes lithological logs. As a result, two aquifers are detected. An upper aquifer of an average thickness of 50 m and a lower aquifer of more than 200 m. These two aquifers are hydraulically connected under semi-confined to confined conditions. Consequently, areal variation maps of depth to aquifers and resistivity are prepared to avoid wells constructions failures. For a thorough evaluation of the aquifers, in the first stage, the petrophysical and hydrogeological parameters, including formation factor, total and effective porosity, shale volume, and hydraulic conductivity, are measured solely from geophysical well-logs with the aid of hydrochemical data. In the second step, the results of geophysical well-logs are interpolated and generalized to detect the spatial variation of the measured petrophysical and hydrogeological parameters over the study area. This was achieved by combining VES measurements and pumping test data with the geophysical well logs. The applied scheme minimized the expenses and effort of the global hydrogeological survey by improving the spatial coverage of the detected parameters. The measured petrophysical and hydrogeological parameters revealed that this formation is highly productive and ideal for groundwater development. However, optimizing groundwater discharge rates is recommended for sustainable water supply in Khartoum state.

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Contribution to Groundwater Research in the World’s Largest Hot Desert: Hydrogeophysical Study for the Apprehension of the Jurassic Aquifer in the Tunisian “Sahara”

Makhlouf,

Guellala,

Ben Lasmar

et al. 2024

Nat Resour Res

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Interpretation of Geometric Elements of the Fahs Aquifer System, Northeast Tunisia: Joint Use of Vertical Electrical Sounding Data, Well Logs and Satellite Imagery

Cited by 8 publications

References 23 publications

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian Aquifer system using geophysical methods

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian Aquifer system using geophysical methods

Investigation of petrophysical and hydrogeological parameters of the transboundary Nubian aquifer by combining geophysical and hydrogeological methods: a case study of Khartoum state, Sudan

Contribution to Groundwater Research in the World’s Largest Hot Desert: Hydrogeophysical Study for the Apprehension of the Jurassic Aquifer in the Tunisian “Sahara”

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