Geophysical and hydrogeological investigation to study the aquifer potential of northern Gafsa basin (central Tunisia)

An integrated hydrogeological and geophysical survey was carried out to determine the geometry and the lateral extent of potential hydrogeological units in Gafsa North. The layering parameters (resistivity and thickness) were obtained from the interpretations of electrical resistivity survey using t...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022-03, Vol.15 (5), Article 433
Main Authors: Gouasmia, Mouez, Mhamdi, Abdelkader, Dhahri, Ferid, Moumni, Lahmadi, Soussi, Mohamed
Format: Article
Language:English
Subjects:
3rd CAJG 2020
Agricultural development
Aquifers
Cretaceous
Cross-sections
Earth and Environmental Science
Earth science
Earth Sciences
Electrical resistivity
Exploitation
Flow mapping
Fluid flow
Gamma rays
Geoelectricity
Geological faults
Geology
Geophysical surveys
Geophysics
Groundwater
Groundwater flow
Groundwater levels
Groundwater table
Hydrodynamics
Hydrogeology
Miocene
Polls & surveys
Quaternary
Sedimentary facies
Surveying
Tectonics
Thickness
Water table
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Summary:An integrated hydrogeological and geophysical survey was carried out to determine the geometry and the lateral extent of potential hydrogeological units in Gafsa North. The layering parameters (resistivity and thickness) were obtained from the interpretations of electrical resistivity survey using the vertical electrical sounding technique and the available data; gamma ray and formation resistivity logs of the existing wells were used to establish geoelectrical cross-sections. However, seismic section permitted to delineate the subsurface geometry of the basin. The geoelectrical cross-sections indicated three main geological units: Plio-Quaternary, Miocene, and Upper Cretaceous exhibiting lateral facies and thickness variations. Piezometric map shows that groundwaters flow from north to south suggesting a general lowering of the groundwater table level toward the south, which can be attributed to the over-exploitation of groundwater to satisfy the increased demand subsequent to the development of agricultural activities. The amount of clays within the Plio-Quaternary aquifer increases from north to south and influences the groundwater flow in the basin. The hydrodynamics is also predisposed to the subsurface structural configuration of the basin controlled by inherited tectonics such folding and faulting.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-09666-3