GEOSCAN Search Results: Fastlink


TitleStratigraphy and structure of the Drake Point Anticline, Sabine Peninsula, Canadian Arctic Islands
AuthorDewing, K; Brake, V; Duchesne, M J; Brent, T A; Joyce, N
SourceCanadian Journal of Earth Sciences 2016, 17 pages,
Alt SeriesEarth Sciences Sector, Contribution Series 20160004
PublisherNRC Press
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNunavut; Northwest Territories
NTS78G/09; 78G/10; 78G/11; 78G/14; 78G/15; 78G/16; 78H/12; 78H/13; 79A/04; 79A/05; 79A/12; 79B/01; 79B/02; 79B/03; 79B/04; 79B/05; 79B/06; 79B/07; 79B/08; 79B/09; 79B/10; 79B/11; 79B/15; 79B/16
AreaCanadian Arctic Islands; Melville Island; Sabine Peninsula
Lat/Long WENS-107.7500 -76.8667 75.6167 11.0000
Subjectsfossil fuels; stratigraphy; structural geology; geophysics; geophysical surveys; seismic surveys; seismic reflection surveys; continental margins; basin analysis; structural features; folds; anticlines; grabens; faults; diapirs; domes; reefs; petroleum resources; hydrocarbons; gas; source rocks; reservoir rocks; gas fields; geological history; tectonic history; crustal uplift; bedrock geology; lithology; sedimentary rocks; clastics; sandstones; mudstones; siltstones; carbonates; olistostromes; evaporites; diamictites; alluvial fans; limestones; shales; cherts; igneous rocks; intrusive rocks; intrusions; sills; dykes; Drake Point Anticline; Sverdrup Basin; Drake Point gas field; Hecla gas field; Christopher Formation; Marryatt Point Syncline; Franklinian Basin; Franklinian Margin; data processing; Phanerozoic; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Devonian; Silurian
Illustrationsgeological sketch maps; stratigraphic charts; stratigraphic correlations; seismic reflection profiles; gamma ray logs; cross-sections, structural; graphs; geochronological charts
ProgramWestern Arctic Project Management, GEM2: Geo-mapping for Energy and Minerals
AbstractModern processing methods were applied to 3400 line-kilometres of legacy seismic data from Sabine Peninsula of Melville Island in the Canadian Arctic Islands. Post-stack reprocessing improved the imaging, allowing new insight into the following issues: the northern extent of lower Paleozoic source rocks, extensional structures and rock types in the upper Paleozoic succession, the timing of the gentle Drake Point Anticline; and the age and extent of igneous sills. The central part of Sabine Peninsula is underlain by a half-graben containing upper Paleozoic strata. The half-graben fill is intersected by just one well, but it likely contains Upper Carboniferous to Lower Permian strata. The two largest conventional gas fields in Canada (Drake Point and Hecla) are hosted in Mesozoic strata within a gentle anticline that partially overlies the half-graben. Previously, the Drake Point Anticline was interpreted to have been formed during Eocene time. We propose that 280 m of the 430 m of structural relief on the Drake Anticline formed in response to uplift at the axis of the anticline in the Early Cretaceous, as shown by thinning of the Lower Cretaceous Christopher Formation over the Drake Anticline. The remaining 150 m of structural relief formed by differential movement between the Marryatt Point Syncline and Drake Point Anticline after the Early Cretaceous. Early Cretaceous relief on the Drake Point Anticline means it was at least partially present at the time of maximum hydrocarbon generation in the Late Cretaceous.
Summary(Plain Language Summary, not published)
This paper is based on seismic collected in the 1970s and 1980s. Using modern computer technology, the seismic was reprocessed and re-interpreted. The reprocessing creates clearer images, especially in the deep (4-6 km) part of the Earth. The geological history of the fold that hosts the giant Drake Point gas field is reinterpreted as having formed earlier than previously thought. This has implications for the timing and extent of folding events in the Canadian Arctic.