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Article Dans Une Revue Zeitschrift der Deutschen Gesellschaft für Geowissenschaften ZDGG Année : 2021

Modelling the 3D geometry of the Dinantian carbonate geothermal reservoir in northern France

Résumé

The current research project aims at better characterising the 3D geometry of the main deep geothermal reservoir in northern France: the Dinantian karstic and brecciated limestones (lower Carboniferous, Mississippian). The detailed 3D geometry of this buried reservoir in the region has been investigated here through the integration of a large database including 1,128 boreholes and 532 km of reprocessed and interpreted seismic reflection profiles. This geological information was then interpolated in a 3D structural model using the GeoModeller software. Despite residual uncertainties related to the time-depth conversion procedure of the seismic data as well as the interpolation process, it provides an image of the 3D geometry of the Dinantian sequence at depth with an unprecedented resolution. The 3D modelling indicates that the Dinantian reservoir is rather continuous and extends over an area of approximately 7,675 km2 in northern France-southwestern Belgium. Interestingly, we document that the Dinantian reservoir extends at least 30 to 40 km south or southwest of the coal basin area as indicated by the geometry of its cut-off line with the major frontal and lateral ramps of the Allochthon Main Basal Thrust of the Northern Variscan Front. From the Lille metropolitan area, where the Dinantian is rather shallow (depth lower than 200 m), the Dinantian reservoir strongly deepens southward as it reaches 1,000–3,000 m depth beneath the coal basin district and a maximum depth of about 7,000 m at the southern end of the study area.
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Dates et versions

hal-04252401 , version 1 (20-10-2023)

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Aurore Laurent, Laurent Beccaletto, Olivier Averbuch, Fabien Graveleau, Frédéric Lacquement, et al.. Modelling the 3D geometry of the Dinantian carbonate geothermal reservoir in northern France. Zeitschrift der Deutschen Gesellschaft für Geowissenschaften ZDGG, 2021, 172 (3), pp.293-305. ⟨10.1127/zdgg/2021/0284⟩. ⟨hal-04252401⟩
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