17 The authors analysis was conducted at this site. The analysis included core sampling and optical televiewer (OPTV) imaging from open-hole drilling. These efforts, outlined in Chapter 8 entitled “Hydro-Stratigraphic study,” made it possible to clarify the stratigraphic controls on the distribution of karstic horizons in the Le Deffend model. The Le Deffend model was subsequently integrated into a geodynamic framework. The results suggest that the distribution of karstified strata is closely tied to low stand system tracts (LST) within a broader depositional sequence affected by sealevel fluctuations. This geophysical and stratigraphic reinterpretation has significant implications for groundwater resource exploration and preservation. These findings are detailed in Chapter 9, “Hydrogeological Model of the Le Deffend site (HES).” The book aims to demonstrate that seismic attributes derived from 3D seismic blocks and other geophysical methods can effectively characterize karstic horizons within carbonate sequences through stratigraphic interpretation. Beyond advancing geophysical methods, the research conducted at the Le Deffend site over two decades provides actionable insights for preserving drinking water resources in the region. It underscores the necessity of controlling water well stratigraphy and borehole completion to optimize groundwater resource management. This collaborative effort between scientists and engineers serves as a model for how applied geophysics can support hydrogeologists, engineers, and policymakers in sustainably managing groundwater resources amidst challenges such as scarcity and pollution.
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