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TitleThermal maturity and hydrocarbon potential of the sedimentary succession from the Hecla field in Sverdrup Basin, Arctic Canada
AuthorGentzis, T; Goodarzi, F
SourceRecent advances in organic petrology and geochemistry, a symposium honoring Dr. P. Hacquebard: proceedings; by Kalkreuth, W D (ed.); Bustin, R M (ed.); Cameron, A R (ed.); International Journal of Coal Geology vol. 19, issue 1-4, 1991 p. 483-517,
Alt SeriesGeological Survey of Canada, Contribution Series 50090
Alt SeriesAlberta Research Council Contribution Series 2044
PublisherElsevier BV
MeetingRecent advances in organic petrology and geochemistry, a symposium honoring Dr. P. Hacquebard, Joint Meeting of the Society for Organic Petrology and the Canadian Coal Petrographers Group; Calgary, Alberta; CA; September 9-14, 1990
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northwest Territories
NTS99; 89; 79; 69; 59; 49; 39; 120; 340; 560
AreaAxel Heiberg Island; Ellesmere Island; Melville Island; Prince Patrick Island
Lat/Long WENS-124.0000 -60.0000 84.0000 75.0000
Subjectsgeneral geology; fossil fuels; source rocks; thermal history; pyrolysis; organic deposits; organic carbon; coal petrology; Sverdrup Basin; Hecla field; Schei Point Group; Deer Bay formation; Jameson Bay formation; Murray Harbour Formation; Cape Richards member; Eden Bay member; Jurassic; Cretaceous
Illustrationslocation maps; stratigraphic charts; graphs; schematic diagrams
AbstractThe thermal maturity and source-rock potential of the Upper Palaeozoic and Mesozoic sediments in the Hecla field, Melville Island, Arctic Canada, have been studied using reflected-light microscopy and Rock-Eval pyrolysis. Approximately 250 polished whole-rock samples were examined and their retlectance (% Ro, random) measured. In addition, approximately 100 samples were subjected to Rock-Eval/TOC analyses. Hydrogen-rich organic matter in the Schei Point Group sediments is dominated by alginite ( Tasmanales), dinoflagellate cysts with minor amounts of sporinite, cutinite, resinite and liptodetrinite in an amorphous fluorescing matrix. Vitrinite reflectance in Cretaceous sediments ranges from 0.41 to 0.54%; in Jurassic sediments it ranges from 0.43 to 0.64% and in Triassic sediments from 0.50 to 0.65%. The Triassic Schei Point Group calcareous shales and marlstones contain organic matter mainly
of marine origin, whereas the predominantly terrestrially-derived organic matter present in the Jameson Bay ( Lower Jurassic ) and in the Upper Jurassic to Lower Cretaceous Deer Bay formations have lower TOC. Only the Ringnes Formation has a TOC content of equivalent to or greater than Schei Point source rocks. Within the Schei Point Group, the Cape Richards and Eden Bay members of the Hoyle Bay Formation are slightly richer in TOC than the Murray Harbour Formation (Cape Caledonia Member). Higher average TOC contents ( > 3.0%) have been reported in the Cape Richards and Eden Bay members in almost all Hecla drillholes. Variations in the level of thermal maturity of Mesozoic sediments in the Hecla field are a function of burial depth. The stratigraphic succession thickens towards the main Sverdrup Basin depocentre located in a N-NE direction. The pattern of the isoreflectance contours at the top of the Triassic (Barrow Formation) is similar to that of formation boundary lines of the same formations, an indication that present-day maturation levels are largely controlled by basin subsidence.

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