GEOSCAN, résultats de la recherche


TitreA synthesis of the Scott Inlet oil seep, Baffin Bay, Canada
AuteurMoir, P N; Oakey, G N; Bennet, R; Dickie, K; Budkewitsch, P; Obermajer, M; Fowler, M
Source3P Arctic, The Polar Petroleum Potential Conference & Exhibition, abstracts volume; par AAPG; 2011 p. 1
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110121
Réunion3P Arctic, The Polar Petroleum Potential Conference & Exhibition; Halifax; CA; août 30 - Septembre 2, 2011
Mediaen ligne; numérique
ProvinceRégion extracotière du nord; Nunavut
SNRC27; 28; 29; 38; 39
Lat/Long OENS-80.0000 -64.0000 80.0000 68.0000
Sujetssuintements d'huile; pétrole; pièges stratigraphiques; analyses stratigraphiques; corrélations stratigraphiques; Campanien; Crétacé supérieur; Coniacien; Santonien; Maestrichtien; Paléocène; grès; mudstones; Turonien; Albien; stratigraphie; combustibles fossiles; Cénozoïque; Crétacé
ProgrammeBassins sédimentaires de la baie de Baffin - Systèmes de pétrole dans l'Arctique canadien est (CAPSE), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Oil slicks were first recorded on the sea surface offshore Scott Inlet, Baffin Island in 1976 by a scientific team from Bedford Institute of Oceanography. In the years that followed several expeditions were completed in the area that successfully collected various geophysical and chemical data, sediment, bedrock and water samples. This included using the Pisces IV submersible in 1981 and 1985 to visually examine the seafloor and collect targeted seafloor samples. The early work confirmed that oil and gas were indeed seeping from several locations. The video footage showed areas with distinctive white Beggiatoa bacteria encrusted sediments locally solidified into a carbonate crust which was trapping oil beneath it. In addition the extensive surface slicks were mapped and observed in several locations off Scott Inlet and Buchan Gulf. While many elements of this active petroleum system remain unknown, a synthesis of recent work provides further insight.
Repeat sea surface mapping using satellite radar confirms the continued existence of extensive and persistence oil slicks to the present.
A succession of recent 2006 to 2010 multibeam seismic surveys over the area illuminate seafloor details about the Quaternary geology, petroleum escape features and the surface expression of the underlying bedrock.
Analysis of the samples and bedrock mapping provide an interpretation of Precambrian basement overlain by Cretaceous and Cenozoic sediments. Late Cretaceous mudstones and shales cored at several locations in the area were originally dated as Campanian in age. Recent palynological work provides a more precise Turonian to Campanian age for the Cretaceous mudstones of Home Bay and Buchan Gulf, and the black shales cored at Scott Inlet. These are equivalent to strata on Bylot Island and possibly marine Cenomanian-Turonian source rocks identified on Ellesmere Island, and Western Greenland.
New analysis of oil that was collected from the 1986 submersible confirms a biodegraded mature oil with biomarkers suggesting an upper Cretaceous marine source. This may be similar to oils indentified in West Greenland.
Regional mapping using 2D seismic reflection and regional refraction profiles indicate an elongated graben (200-300 km by 25-50 km wide) striking northwest to southeast named the Scott Inlet Basin. It contains up to 6 km of sediments thought to correlate with Cretaceous and Cenozoic strata on Bylot Island.
Recent geological mapping of Bylot Island, approximately 300 kilometers northwest of Scott Inlet may provide clues as to the stratigraphy of the Scott Inlet Basin. It establishes strata in the range of middle Albian to possible Turonian suggesting correlation with the Hassel Formation, widespread in the Canada Arctic. Successively younger strata contain assemblages suggestive of Coniacian, Santonian, early late Maastrichtian, late early or early late Paleocene ages. A thick (500m) coarse grained sandstone unit that is widespread on SW Bylot island that grades laterally to deep marine mudstone and may be a possible coeval equivalent for a Scott Inlet Basin reservoir rock.