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2020-03-15 - Article/Dans un journal avec peer-review - Anglais - page(s)

Licour Luciane, Goderniaux Pascal , Dupont Nicolas , Hennebert Michel , Swennen Rudy, Steemans Philippe, Boulvain Frédéric, Petitclerc Estelle, Rorive Alain , Baele Jean-Marc , "Stratigraphical reinterpret ion of Devonian strata underlying the Mons Basin based on cuttings from the Saint-Ghislain borehole, Hainaut, Belgium" in Geologica Belgica, Accepted (In Press)

  • Edition : Geologica Belgica, Liège (Belgium)
  • Codes CREF : Hydrogéologie (DI1426)
  • Unités de recherche UMONS : Géologie fondamentale et appliquée (F401)
  • Instituts UMONS : Institut des Sciences et du Management des Risques (Risques), Institut de Recherche en Energétique (Energie)
Texte intégral :

Abstract(s) :

(Anglais) It is revealed that the lowest 1010 m of the Saint-Ghislain borehole (-4393 to -5403 m), of which cuttings are available, constitutes a crucial source of information to investigate, amongst others, the deep geothermal potential within the Brabant Parautochthon, underlying the Mons Basin, Hainaut. The lithological succession of this interval was reconstructed based mainly on visual analysis and calcimetry of 852 cutting samples as well as four core samples. Additionally, palynological, magnetic susceptibility and X-ray diffraction analyses were conducted in order to complement the dataset. The lower section of the investigated borehole sequence mainly consists of grey calcareous shale while the middle section is dominated by blue-grey shaly limestone and the upper section is mainly composed of green shale. Palynomorphs found at -5261 m suggest an uppermost Givetian – Lower Frasnian age. A new lithostratigraphical interpretation of the deepest part of the Saint-Ghislain borehole is proposed. The lower calcareous shale from 5403 m to 5100 m is interpreted as the Bovesse Formation (Lower Frasnian) and at its base possibly uppermost Givetian . The overlying limestones from -5100 to -4790 m can be attributed to the Rhisnes Formation (Upper Frasnian), and the green shale between ca. -4393 and -4790 m, to the Bois de la Rocq Member (Famennian). These results open new insights regarding the geological interpretation of the basement underlying the Mons Basin. They also present a promising approach and example regarding interpretations based on cuttings.