GEOSCAN, résultats de la recherche


TitreBottom simulating reflectors on Canada's east coast margin: evidence for gas hydrate
AuteurMosher, D C
SourceProceedings of the 6th International Conference on Gas Hydrates (ICGH 2008); 2008, 11 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20080148
Réunion6th International Conference on Gas Hydrates (ICGH 2008); Vancouver, BC; CA; juillet 6-10, 2008
Mediapapier; CD-ROM
Formatspdf (Adobe® Reader®)
ProvinceRégion extracotière de l'est; Terre-Neuve-et-Labrador; Nouvelle-Écosse
SNRC1; 2; 3D; 10; 11
Lat/Long OENS-64.0000 -44.0000 54.0000 40.0000
Sujetshydrocarbures; hydrate; méthane; capacité de production d'hydrocarbures; levés géophysiques; levés de reflexion sismiques; marges continentales, atlantique; plate-forme continentale; talus continental; géologie du substratum rocheux; roches sédimentaires; analyses structurales; caractéristiques structurales; failles; exploration; exploration pétrolière; sédiments marins; dépôts glaciaires; dépôts postglaciaires; Bloc de Barrington ; hydrates de gaz; combustibles fossiles; géophysique; géologie marine; Phanérozoïque; Cénozoïque; Mésozoïque
Illustrationssketch maps; seismic reflection profiles; cross-plots
ProgrammeLes hydrates de gaz - carburant de l'avenir?
Résumé(disponible en anglais seulement)
The presence of gas hydrates offshore of eastern Canada has long been inferred from estimated stability zone calculations, but the physical evidence is yet to be discovered. While geophysical evidence derived from seismic and borehole logging data provides indications of hydrate occurrence in a number of areas, the results are not regionally comprehensive and, in some cases, are inconsistent. In this study, the results of systematic seismic mapping along the Scotian and Newfoundland margins are documented. An extensive set of 2-D and 3-D, single and multi-channel, seismic reflection data comprising ~45,000 line-km was analyzed for possible evidence of hydrate.
Bottom simulating reflectors (including one double BSR) were identified at five different sites, ranging between 300 and 600 m below the seafloor and in water depths of 1000 to 2900 m. The combined area of the five BSRs is 1720 km2, which comprises a small proportion of the theoretical stability zone area along the Scotian and Newfoundland margins (~635,000 km2). The apparent paucity of BSRs may relate to the rarity of gas hydrates on the margin or may be simply due to geophysical limitations in detecting hydrate.