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TitleBottom simulating reflectors on Canada's east coast margin: evidence for gas hydrate
AuthorMosher, D C
SourceProceedings of the 6th International Conference on Gas Hydrates (ICGH 2008); 2008, 11 pages
Alt SeriesEarth Sciences Sector, Contribution Series 20080148
Meeting6th International Conference on Gas Hydrates (ICGH 2008); Vancouver, BC; CA; July 6-10, 2008
Mediapaper; CD-ROM
File formatpdf (Adobe® Reader®)
ProvinceEastern offshore region; Newfoundland and Labrador; Nova Scotia
NTS1; 2; 3D; 10; 11
AreaGrand Banks; Flemish Pass; Haddock Channel; Scotian Shelf; Mohican Channel; Scotian Slope
Lat/Long WENS-64.0000 -44.0000 54.0000 40.0000
Subjectsfossil fuels; geophysics; marine geology; hydrocarbons; hydrate; methane; hydrocarbon potential; geophysical surveys; seismic reflection surveys; continental margins, atlantic; continental shelf; continental slope; bedrock geology; sedimentary rocks; structural analyses; structural features; faults; exploration; petroleum exploration; marine sediments; glacial deposits; postglacial deposits; Orphan Spur; Sackville Spur; Barrington Block; gas hydrates; bottom simulating reflectors (BSR); hydrate stability; geological hazards; mounds; chimneys; Phanerozoic; Cenozoic; Mesozoic
Illustrationssketch maps; seismic reflection profiles; cross-plots
ProgramGas Hydrates - Fuel of the Future?
AbstractThe 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.