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TitreForward stratigraphic modelling of sediment pathways and depocentres in salt-influenced passive-margin basins: Lower Cretaceous, central Scotian Basin
AuteurSangster, C; Piper, D J W; Hawie, N; Pe-Piper, G; Saint-Ange, F
SourceBasin Research 2019 p. 1-26, https://doi.org/10.1111/bre.12342
Année2019
Séries alt.Ressources naturelles Canada, Contribution externe 20180262
ÉditeurWiley
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1111/bre.12342
Mediapapier; en ligne; numérique
Formatspdf (Adobe® Reader®); html
ProvinceNouvelle-Écosse; Région extracotière de l'est
SNRC10; 11B; 11C
Lat/Long OENS -61.5000 -57.7500 44.7500 42.1667
SujetsCrétacé inférieur; analyses stratigraphiques; modèles sédimentaires; milieu sédimentaire; antecedents de sedimentation; dispersion des sédiments; distribution des sédiments; transport des sediments; origine; régions émettrices; géologie du substratum rocheux; lithologie; roches sédimentaires; grès; dépôts de sel; schistes; bassins sédimentaires; établissement de modèles; simulations par ordinateur; analyses statistiques; puits; données sismiques; antécédents tectoniques; tectonique du sel; affaissement; soulèvement de la croûte; orogénies; contrôles structuraux; courants de turbidite; analyses granulométriques; sables; argiles; dépôts fluviaux; deltas; paléodrainage; paléohydrologie; lithofaciès; Bassin Néo-Écossais; Formation de Logan Canyon ; Membre de Naskapi ; Membre de Cree ; Formation de Missisauga ; Puit Alma F-67 ; Puit Chebucto K-90 ; Puit Cohasset L-97 ; Puit Thebaud I-93 ; Puit Venture B-52 ; Terrane de Meguma ; méthodologie; géologie marine; stratigraphie; géologie structurale; tectonique; Phanérozoïque; Mésozoïque; Crétacé
Illustrationslocation maps; stratigraphic columns; geoscientific sketch maps; tables; plots; bar graphs; frequency distribution diagrams
ProgrammeAnalyse des bassins frontaliers, Les géosciences pour les nouvelles sources d'énergie
Diffusé2019 02 03
Résumé(disponible en anglais seulement)
Source-to-sink studies and numerical modelling software are increasingly used to better understand sedimentary basins, and to predict sediment distributions. However, predictive modelling remains problematic in basins dominated by salt tectonics. The Lower Cretaceous delta system of the Scotian Basin is well suited for source-to-sink studies and provides an opportunity to apply this approach to a region experiencing active salt tectonism. This study uses forward stratigraphic modelling software and statistical analysis software to produce predictive stratigraphic models of the central Scotian Basin, test their sensitivity to different input parameters, assess proposed provenance pathways, and determine the distribution of sand and factors that control sedimentation in the basin. Models have been calibrated against reference wells and seismic surfaces, and implement a multidisciplinary approach to define simulation parameters. Simulation results show that previously proposed provenance pathways for the Early Cretaceous can be used to generate predictive stratigraphic models, which simulate the overall sediment distribution for the central Scotian Basin. Modelling confirms that the shaly nature of the Naskapi Member is the result of tectonic diversion of the Sable and Banquereau rivers and suggests additional episodic diversion during the deposition of the Cree Member. Sand is dominantly trapped on the shelf in all units, with transport into the basin along salt corridors and as a result of turbidity current flows occurring in the Upper Missisauga Formation and Cree Member. This led to sand accumulation in minibasins with a large deposit seawards of the Tantallon M-41 well. Sand also appears to bypass the basin via salt corridors which lead to the down-slope edge of the study area. Sensitivity analysis suggests that the grain size of source sediments to the system is the controlling factor of sand distribution. The methodology applied to this basin has applications to other regions complicated by salt tectonics, and where sediment distribution and transport from source-to-sink remain unclear.
Résumé(Résumé en langage clair et simple, non publié)
Cette étude consistait en la modélisation de la distribution du sable dans l'intervalle supérieur du réservoir de pétrole du bassin Scotian afin d'atténuer les risques d'une exploration pétrolière à venir.
GEOSCAN ID313019