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TitleThe Mohican Channel gas hydrate zone, Scotian Slope: geophysical structure
AuthorCullen, J; Mosher, D C; Louden, K
SourceProceedings of the 6th International Conference on Gas Hydrates (ICGH 2008); 2008, 10 pages
Alt SeriesEarth Sciences Sector, Contribution Series 20080293
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
AreaMohican Channel; Scotian Slope
Lat/Long WENS-62.5000 -62.0000 42.8333 42.3333
Subjectsfossil fuels; geophysics; marine geology; hydrocarbons; hydrate; methane; hydrocarbon potential; geophysical surveys; seismic reflection surveys; seismic data; seismic velocities; models; continental margins, atlantic; continental slope; bedrock geology; sedimentary rocks; structural analyses; structural features; faults; exploration; petroleum exploration; marine sediments; glacial deposits; postglacial deposits; debris flows; gas seeps; fluid migration; pockmarks; piston cores; ethane; carbon isotopes; C15 Torbrook Well; gas hydrates; gas hydrate stability zone (GHSZ); bottom simulating reflectors (BSR); geological hazards; chimneys; vents; ethene; carbon-13; Phanerozoic; Cenozoic; Mesozoic
Illustrationssketch maps; models; seismic reflection profiles; tables; plots
ProgramGas Hydrates - Fuel of the Future?
AbstractThe 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.