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TitleGeochemistry of the Cretaceous Chinkeh oil from Maxhamish field and Garbutt black shale in the Liard Basin, Canada: implications for a liquid-rich shale hydrocarbon resource
AuthorJiang, CORCID logo; Bennet, B; Ferri, F; Chen, ZORCID logo; Ardakani, O HORCID logo; McMechan, MORCID logo
SourceInternational Journal of Coal Geology vol. 238, 103716, 2021 p. 1-19,
Alt SeriesNatural Resources Canada, Contribution Series 20200749
Mediapaper; on-line; digital
File formatpdf; html
ProvinceBritish Columbia; Northwest Territories
NTS94O; 94P/03; 94P/04; 94P/05; 94P/06; 94P/11; 94P/12; 94P/13; 94P/14; 95B/03; 95B/04
Lat/Long WENS-124.0000 -121.0000 60.1667 59.0000
Subjectsfossil fuels; geochemistry; Science and Technology; Nature and Environment; petroleum resources; hydrocarbon potential; hydrocarbons; oil; oil shales; bedrock geology; lithology; sedimentary rocks; black shales; sandstones; hydrocarbon maturation; source rocks; thermal maturation; exploration wells; Western Canada Sedimentary Basin; Liard Basin; Maxhamish Field; Chinkeh Formation; Garbutt Formation; Horn River Basin; Phanerozoic; Mesozoic; Cretaceous
Illustrationslocation maps; geoscientific sketch maps; stratigraphic cross-sections; tables; spectra; plots; ternary diagrams
ProgramGeoscience for New Energy Supply (GNES) Canadian Energy Geoscience Innovation Cluster (CEGIC)
Released2021 03 04
AbstractThe Cretaceous Garbutt Formation shale and crude oils from the Cretaceous Chinkeh Formation in Liard Basin were subjected to geochemical analysis including biomarker fingerprinting. The Chinkeh oils are sweet light oils with API gravity and geochemical markers typical for the late stage oil window maturity. The oils show good correlation to the Garbutt shale extracts for their sterane compositions, while there are some minor discrepancies amongst their terpane distributions. These differences include enhanced contribution of tricyclic terpanes, high C23 tricyclic terpanes versus C30 hopane and low C24 tetracyclic terpane versus C26 tricyclic terpanes for the Chinkeh oil compared with the Garbutt shale extracts. Although not analyzed during this study, the Triassic Toad/Grayling interval, as stratigraphic equivalents of the Montney and Doig formations in Western Canada Sedimentary Basin may account for the terpane compositional features. Therefore, it is likely that the Chinkeh oils are mainly sourced from the Cretaceous Garbutt shale with minor additional contributions from a Triassic source. The Garbutt Shale is immature in the Horn River Basin, while in the Liard Basin in a north to south transect the unit's thermal maturity ranges from early mature oil window to wet gas/condensate window, and thus may be prospective for unconventional liquid hydrocarbon resource recovery.
Summary(Plain Language Summary, not published)
Gas chromatographic instrumental analyses were carried out the solvent extracts of the Cretaceous Garbutt Formation shale and the Cretaceous Chinkeh light oils from the Liard Basin for their molecular compositions. The results indicate that Chinkeh oils show good correspondence to the Garbutt shale extracts in terms of their steroid compositions, suggesting that Garbutt shale made significant source contribution to the Chinkeh oil accumulation. There are minor discrepancies between Chinkeh oils and Garbutt shale extracts in their terpane distributions, and this is likely due to a secondary source contribution from the Triassic Toad/Grayling, stratigraphic equivalents of the Montney and Doig that have been know as a major source rock interval in the Western Canada Sedimentary Basin.

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