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Communication Dans Un Congrès Année : 2019

ALBION : a multi-scales 3D dynamic outcrop analogue of Barremian-Aptian peri-Tehyan carbonate platforms

Résumé

Building consistent models of carbonate reservoirs requires beforehand a realistic appreciation of their heterogeneity. Typically, the heterogeneity in carbonates originates at different scales and from multi-geological processes. Moreover, various processes related to water-rock interactions and fluids displacements affect the reservoir and enhance the heterogeneity of deposits. In some cases, karst can develop in the formation, leading to a self-organised reservoir. Conventional description of outcrops does not achieve the objective of reservoir characterization because of the variable accessibility and quality of outcrops (surface weathering), a description that rarely allows tackling geological processes, no direct assessment of the impact of reservoir heterogeneity on hydrodynamic behavior. A new concept has arised from the needs of characterizing carbonates at different scales and from an integrated point of view: the dynamic outcrop analogue. The dynamic analogue is assessed through multi-physics data acquired on outcrops but also on plugs, cores, in boreholes and between wells and in underground passageways. Coupling the hydrodynamic response of groundwater reservoir to a static description of its heterogeneity very early before the building of models provides a key knowledge on the understanding of reservoir architecture. It contributes to improve the way models are populated and to enhance the forecast of reservoir. The ALBION project focuses on Urgonian limestones from south-eastern France. The studied dynamic outcrop analogue is the Fontaine-de-Vaucluse aquifer mostly developed in the Urgonian formation. 32 field sections have been described and used to build a comprehensive geological model of this area, which covers more than 1000 km2 (Tendil , 2018). This analogue benefits also from original accesses to the reservoir via numerous caves and the so-called LSBB (www.lsbb.eu) which is an underground laboratory. In LSBB tunnels, five boreholes spaced a few meters apart enable multi-physics study of unweathered carbonate rock at fine scale. Links between facies, stratigraphic discontinuities and hydrodynamics have been investigated (Cochard, 2018). Next to these wells, three horizontal cores, respectively 240m, 110m and 70m long have been acquired in different directions and allow studying intra-horizon heterogeneity at an inter-wells scale. The center of the studied area is the Albion Plateau where few outcrops allow geological studies. On the plateau, the karstic network is well-developed with very deep vertical caves. Some of them allowed rock sampling and geological description up to a depth of about 800m, and provided results which contributed to model enhancement. Through the ALBION dynamic analogue was developed an integrated workflow coupling multiscales and multi-physics characterization. It provides new insights into karst and paleo-karst genesis processes. Relationships between the development of specific karst features and lithology are proposed and tested through numerical modelling.
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Dates et versions

hal-03751526 , version 1 (14-08-2022)

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  • HAL Id : hal-03751526 , version 1

Citer

Charles Danquigny, Gérard Massonnat, Anthony Tendil, Jean Cochard, Jean Borgomano, et al.. ALBION : a multi-scales 3D dynamic outcrop analogue of Barremian-Aptian peri-Tehyan carbonate platforms. 16th International Meeting of Carbonate Sedimentologists, Bathurst Meeting, Jul 2019, Palma de Mallorca, Spain. ⟨hal-03751526⟩
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