Tectonic influences on karstic limestone formations due to tebessa basin collapse, Tezbent-Cheria region, S-W of Tebessa (Algeria)

Abstract

Tectonics plays an important role in the development of karst systems in originally
porous or fissured reservoir rocks. The hydrogeological behavior of the Cretaceous
limestones of the Tazbent-Cheria basin is greatly influenced by the discontinuities
related to the collapse of the Tebessa basin. The objective of our research is
to characterize the structure and functioning of the karst environment in the
Maastrichtian limestones in abnormal contact with the Eocene carbonate formations.
To properly characterize the deformation context and the fault systems that
characterize this area; we combined geophysical data, stratigraphic sections and
pumping tests. The results of the interpretation of geoelectric profiles (NE-SW) and
their correlation with drilling logs distributed over the study area show a horizontal
overturning of the formations of the Maastrichtian layers with abnormal contacts
between the Cretaceous and the Eocene. They also indicate that fault networks tend
to attenuate and formations to harden away from the edges of the collapse basin.
By its structural scope; our study contributes to the governance of water resources in
fractured aquifers of the region showing indicators of water stress.
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