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TitreThe Paleozoic Hudson Bay Basin in northern Canada: new insights into hydrocarbon potential of a frontier intracratonic basin
AuteurLavoie, D; Pinet, N; Dietrich, J; Chen, Z
SourceAmerican Association of Petroleum Geologists Bulletin vol. 99, no. 5, 2015 p. 859-888, https://doi.org/10.1306/12161414060
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130505
ÉditeurAmerican Association of Petroleum Geologists
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1306/12161414060
Mediapapier; en ligne; numérique
Formatspdf
ProvinceManitoba; Nunavut; Ontario; Québec
Sujetsaffaissement; isostasie; bassins; analyses du bassin; Ordovicien supérieur; Dévonien inférieur; Dévonien supérieur; lithologie; capacité de production d'hydrocarbures; bassins intracratoniques; établissement de modèles; exploration pétrolière; corrélations stratigraphiques; analyses stratigraphiques; discordances; evolution du bassin; Silurien inférieur; interpretations sismiques; porosité; perméabilité; roches mères; antecedents thermiques; reservoirs; failles; combustibles fossiles; sédimentologie; stratigraphie; géologie structurale; Dévonien; Silurien; Ordovicien
Illustrationsgeological sketch maps; stratigraphic cross-sections; seismic profiles
ProgrammeBassins sédimentaires d'Hudson / Foxe Bay, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
The Hudson Bay Basin is the largest intracratonic basin in North America, although it is the only one without any proven hydrocarbon reserves. The stratigraphic succession that fills the basin consists mainly of Paleozoic strata, with a maximum preserved thickness of about 2500 m (8202 ft). The Paleozoic succession includes Ordovician to Devonian shallow marine carbonates, reefs, and shales with locally thick Devonian evaporites. The Paleozoic strata are locally unconformably overlain by a thin Mesozoic and Cenozoic cover of nonmarine and marine strata. From 1964 to 1985, over 46,000 line-km (28,600 mi) of seismic reflection data were acquired, and four onshore and five offshore exploration wells were drilled. The data acquired at that time led to pessimistic conclusions on source rocks and the thermal rank of the basin and resulted in the stoppage of exploration activities. However, hydrocarbon shows or indicators were identified in well log data and seismic reflection profiles. The likelihood of an active petroleum system has also been recently supported by recognition of pockmarks on the seafloor and possible marine oil slicks identified on satellite images.
New studies of geological, geophysical, and biostratigraphic data reveal that the Hudson Bay Basin had an irregular subsidence and uplift history. Syntectonic deposition occurred during the Late Ordovician(?) to Early Devonian and sag-basin deposition during the Middle to Late Devonian. The basin contains four unconformity-bounded sequences, with significant depocenter migration over time. Analyses of petroleum-system data indicate the Hudson Bay Basin has higher petroleum potential than previously considered. Porous platform limestones, reefs, hydrothermal dolomites, and siliciclastics form potential hydrocarbon reservoirs. Upper Ordovician organic-rich shales with type II-S organic matter are recognized at several locations in the basin. Newly acquired organic matter reflectance and Rock-Eval Tmax data indicate Ordovician-Silurian strata locally reached the oil window. Basin modeling demonstrates significant potential for oil generation and expulsion from Ordovician source rocks. Five petroleum play types are identified in the Hudson Bay Basin, including an untested fault-sag or hydrothermal dolomite play. The synthesis of the petroleum system information indicates that the Hudson Bay Basin is, at least locally, prospective for oil accumulations.
Résumé(Résumé en langage clair et simple, non publié)
Le Bassin de la Baie d'Hudson et le plus grand bassin intracratonique en Amérique du Nord et l'un des plus grands bassins sédimentaire canadien. Ces bassins intracratoniques aux USA sont des producteurs important d'huile et de gaz naturel. Une première phase d'exploration (1969-1985) n'a pas permis d'identifier des réserves commerciales d'hydrocarbures. En tant qu'un élément de la stratégie de l'énergie du programme GEM-1, une réévaluation des données historiques et des acquisitions stratégiques de nouvelles données géoscientifiques ont mené à la modernisation de notre connaissance de la géologie de ce bassin avec la proposition de nouveaux concepts d'exploration pour les hydrocarbures. La synthèse des données sur les hydrocarbures suggère que le Bassin de la Bai d'Hudson a un potentiel pétrolier.
GEOSCAN ID293798