The project aims to characterize the diagenetic sequence of Jurassic formations located in the northern part of the Aquitaine Basin. These formations, whose diagenetic history is poorly understood, appear to be potential sites for geothermal energy or CO2 storage applications in a rapidly growing region. This project was selected by the PEPR Sous-Sol / Aquitaine Basin project, which funded a two-year post-doctoral fellowship that began at the end of 2025.
Several fluid events are known regionally and may have affected the porosity/permeability properties of the Jurassic formations through dissolution or cementation processes: early dolomitization (Mano Dolomite), basin fluids during Jurassic burial, an episode of karstification and meteoric fluid circulation associated with the Lower Cretaceous event, late episodes of dolomitization, etc. The objective of this study will be to provide temperature constraints for the different cementation phases, in particular through microthermometry of fluid inclusions and clump isotope thermometry, and thus to reconstruct the history of their burial. These data will also make it possible to place the evolution of Jurassic formations within the geodynamics of Western Europe.
The researchers involved in this project are from the GEOPS, LSCE, Géosciences Rennes, and BRGM laboratories.
Project leader: Jocelyn Barbarand
Funding source: PROJECT TARGET No. 12: Aquitaine Basin (AquiBEAT) of the PEPR Sous-Sol https://www.soussol-bien-commun.fr/fr/aquibeat-geologie-du-bassin-aquitain-pour-transition-energetique
GEOPS personnel involved: Tarik Kernif (postdoctoral researcher), Jocelyn Barbarand, Thomas Blaise, Benjamin Brigaud
Collaboration with: LSCE, Géosciences Rennes, and BRGM