Modelling the 3-D geometry of the Dinantian carbonates reservoir in the Nord-Pas-de-Calais coal district area: towards a better characterization of the deep geothermal potential in Northern France - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2021

Modelling the 3-D geometry of the Dinantian carbonates reservoir in the Nord-Pas-de-Calais coal district area: towards a better characterization of the deep geothermal potential in Northern France

Résumé

Within the Act of 17.08.2015 on energy transition voted by the French government, the Hauts-de-France region (Northern France) is committed to invest and develop massively renewable energies in the coming decades, especially low-temperature geothermal energy. The current research project aims at better characterizing the geometry of the main deep geothermal reservoir in the area of the Nord-Pas-de-Calais (NPC) coal basin: the Dinantian karstic and brecciated limestones (Lower Carboniferous, 360-330 Ma). The occurrence of a Dinantian regional geothermal resource has already been proven in Belgium in the Hainaut coal basin area where the temperature in three geothermal wells reaches about 70°C. The Dinantian reservoir forms part of a large-scale transgressive carbonate platform developed onto the slowly subsiding southern Avalonian margin during the Mid-Upper Devonian to Lower Carboniferous. The Upper Carboniferous Variscan collision between Avalonia and Armorica-Gondwana led to the tectonic inversion of the Avalonian margin and the development of a north-vergent thrust system, whose front crosses northern France. The Dinantian platform was progressively buried under the NPC synorogenic molassic foreland basin developed along the Northern Variscan front. Prior to our study, very little information was known on the structure of this reservoir under the coal basin. Its 3D-geometry has been investigated through the integration in a 3D model of a large database including 590 boreholes and 532 km of reprocessed and interpreted seismic reflexion profiles. First results of the 3D-modelling indicate that the Dinantian reservoir is continuous and extends over an area of at least 10750 km². It is present at 100-200 m depth in the Brabant foreland near Lille metropole. It strongly deepens southward and reaches approximately 7.5 km depth under the coal basin to the south of Cambrai. Major thickness variations (250-1000 m), often related to a complex structure involving deep variscan thrusts, have also been observed.
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Dates et versions

hal-04386068 , version 1 (10-01-2024)

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  • HAL Id : hal-04386068 , version 1

Citer

Aurore Laurent, Olivier Averbuch, Laurent Beccaletto, Fabien Graveleau, Frédéric Lacquement, et al.. Modelling the 3-D geometry of the Dinantian carbonates reservoir in the Nord-Pas-de-Calais coal district area: towards a better characterization of the deep geothermal potential in Northern France. 12th European Geothermal PhD Days, Feb 2021, Cergy Pontoise, France. ⟨hal-04386068⟩
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