Abstracts
Abstract
We use new and existing nannofossil, palynological, and microfossil biostratigraphic data in conjunction with lithologic and geophysical logs from four wells to establish a series of sequence-stratigraphic events in the Mesozoic–Cenozoic of the Laurentian Subbasin of offshore Newfoundland, eastern Canada. Well biostratigraphic events are integrated with reflection seismic in the area to correlate regional seismic stratigraphic surfaces. The four wells are: Bandol-1, Emerillon C-56, East Wolverine G-37, and Heron H-73. We extend the event stratigraphic scheme previously developed for the Scotian Margin, offshore Nova Scotia, into new areas to the east along the southern Grand Banks, where we recognize four new well-log sequence stratigraphic events, and we modify the definition of a previously recognized regional surface. The new and modified regional surfaces are the Early Albian Unconformity, the Late Bathonian Maximum Flooding Surface (MFS), the Late Bajocian MFS (renamed from Bathonian/Bajocian MFS), the ?Bajocian/Toarcian Unconformity, and the Late Pliensbachian MFS. We recognize the "Avalon Unconformity" and "Base-Tertiary Unconformity" of previous studies as amalgamations of multiple smaller-scale unconformities and refine their age in the studied wells. A major improvement over our earlier Scotian Margin event schemes is the extension of the event stratigraphy into the Early Jurassic using a suite of marine biostratigraphic markers. We compare the Early Jurassic event scheme to Deep Sea Drilling Project Site 547B on the conjugate Moroccan Margin to better constrain potential source rock intervals and the early history of the central Atlantic Ocean.
Résumé
Nous utilisons des données biostratigraphiques sur les microfossiles, des données palynologiques et des données sur les nanofossiles, nouvelles et existantes, conjointement avec des diagraphies lithologiques et géophysiques de quatre puits pour définir une série de phénomènes stratigraphiques séquentiels de la tranche du Mésozoïque-Cénozoïque du sous-bassin Laurentien au large des côtes de Terre-Neuve, dans l’est du Canada. Les phénomènes biostratigraphiques des puits sont intégrés à la sismique réflexion dans le secteur aux fins d’une corrélation des surfaces stratigraphiques sismiques régionales. Les quatre puits en question sont les puits Bandol-1, Emerillon C-56, East Wolverine G-37 et Heron H-73. Nous élargissons le plan stratigraphique des phénomènes précédemment créé pour la marge de Scotian, au large des côtes de la Nouvelle-Écosse, aux nouveaux secteurs à l’est le long de la zone méridionale des Grands bancs, où nous reconnaissons quatre nouveaux phénomènes stratigraphiques séquentiels dans les diagraphies des puits et nous modifions la définition d’une surface régionale antérieurement reconnue. Les nouvelles surfaces régionales modifiées sont la discordance de l’Albien précoce, la surface d’inondation maximale (SIM) du Bathonien tardif, la SIM du Bajocien tardif (SIM du Bathonien/Bajocien rebaptisée), la discordance bajocienne?/toarcienne et la SIM du Pliensbachien tardif. Nous reconnaissons la « discordance d’Avalon » et la « discordance de base-tertiaire » d’études antérieures en tant que regroupements de plusieurs discordances d’échelle plus modeste et nous déterminons leur âge de façon plus précise dans les puits étudiés. Une amélioration notable par rapport à nos plans antérieurs des phénomènes survenus dans la marge de Scotian est l’élargissement de la stratigraphie des phénomènes au cours du Jurassique précoce au moyen de repères stratigraphiques marins. Nous comparons le plan des phénomènes du Jurassique précoce au site 547B du projet de forage en eau profonde sur la marge marocaine conjuguée pour mieux limiter les intervalles éventuels de roche mère et les débuts de l’océan Atlantique central.
Appendices
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