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TitreThe Mohican Channel gas hydrate zone, Scotian Slope: geophysical structure
AuteurCullen, J; Mosher, D C; Louden, K
SourceProceedings of the 6th International Conference on Gas Hydrates (ICGH 2008); 2008, 10 pages
Année2008
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080293
Réunion6th International Conference on Gas Hydrates (ICGH 2008); Vancouver, BC; CA; juillet 6-10, 2008
Documentlivre
Lang.anglais
Mediapapier; CD-ROM
Formatspdf (Adobe® Reader®)
ProvinceRégion extracotière de l'est; Terre-Neuve-et-Labrador; Nouvelle-Écosse
SNRC10
Lat/Long OENS-62.5000 -62.0000 42.8333 42.3333
Sujetshydrocarbures; hydrate; méthane; capacité de production d'hydrocarbures; levés géophysiques; levés de reflexion sismiques; données sismiques; vitesse des ondes sismiques; modèles; marges continentales, atlantique; talus continental; géologie du substratum rocheux; roches sédimentaires; analyses structurales; caractéristiques structurales; failles; exploration; exploration pétrolière; sédiments marins; dépôts glaciaires; dépôts postglaciaires; coulées de débris; dégagements gazeux; migration des fluides; trous; carottages par piston; ethane; isotopes de carbone; Puit C15 Torbrook ; hydrates de gaz; combustibles fossiles; géophysique; géologie marine; Phanérozoïque; Cénozoïque; Mésozoïque
Illustrationssketch maps; models; seismic reflection profiles; tables; plots
ProgrammeLes hydrates de gaz - carburant de l'avenir?
Résumé(disponible en anglais seulement)
The Scotian margin of the east coast of Canada has a large theoretical gas hydrate stability zone (GHSZ) yet review of extensive industry seismic data reveals a prominent BSR at only one location. 3D seismic reflection and long offset (9 km) pre-stack 2D multichannel seismic data were used to study the velocity structure and geophysical characteristics of the hydrate zone and surrounding regions. The Mohican Channel study area shows a unique double BSR at 300 to 450 m below the seafloor in the western section of the study area immediately adjacent to the Mohican Channel in a water depth range of 1500-1930m. The topmost BSR (BSR 1) is the more extensive of the two covering an area of 150 km2 in the 3D volume and a calculated area of 280 km2 using 2D industry and single-channel seismic profiles outside of the study area. BSR 2 covers an area of ~50 km2 and occurs approximately 80m below BSR 1. A system of polygonal faults is prominent in the area and some faults appear as conduits for gas leakage into the GHSZ. Fluid escape features are common on the surface of BSR 1 but rare on the seafloor suggesting that fluid flux is at lower levels than in the past.
GEOSCAN ID225600