Deep geothermal resource assessment of the St. Lawrence Lowlands sedimentary basin (Québec) based on 3D regional geological modelling.

Bédard, Karine; Comeau, Félix-Antoine; Raymond, Jasmin ORCID: https://orcid.org/0000-0002-7486-9185; Gloaguen, Erwan ORCID: https://orcid.org/0000-0002-9400-0276; Malo, Michel et Richard, Marc-André (2020). Deep geothermal resource assessment of the St. Lawrence Lowlands sedimentary basin (Québec) based on 3D regional geological modelling. Geomechanics and Geophysics for Geo-Energy and Geo-Resources , vol. 6 , nº 3. p. 46. DOI: 10.1007/s40948-020-00170-0.

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Résumé

Geothermal resource quantification requires underground temperature and volume information, which can be challenging to accurately assess at the regional scale. The analytical solution for steady-state heat conduction with internal heat generation is often used to calculate temperature at depth, while geological models can provide volume information. Both approaches were originally combined in a single 3D geological model, in which the underground temperature is directly computed, to accurately evaluate geothermal resources suitable for power generation in the St. Lawrence Lowlands sedimentary basin covering 18,000 km2 in Quebec, Canada, and improve methods for geothermal resource quantification. This approach, used for the first time at such a large scale, allowed to determine the volume of each thermal unit providing a detail assessment of resource depth, temperature and host geological formation. Only 5% of geothermal resources at a temperature above 120 °C that is suitable for power generation were shown to be hosted in the Cambro-Ordovician sedimentary rock sequences at a depth of 4 to 6 km, while 95% of the resource is hosted by the underlying Precambrian basement.

Type de document:	Article
Mots-clés libres:	temperature; thermal; heat conduction; geothermal resource; enhance geothermal system
Centre:	Centre Eau Terre Environnement
Date de dépôt:	24 févr. 2021 16:57
Dernière modification:	15 févr. 2022 21:33
URI:	https://espace.inrs.ca/id/eprint/11352

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