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TitleDepositional environment and hydrocarbon potential of the Middle Triassic strata of the Sverdrup Basin, Canada
AuthorKondla, D; Sanei, H; Embry, A; Haeri-Ardakani, O; Clarkson, C R
SourceInternational Journal of Coal Geology vol. 147-148, 2015 p. 71-84,
Alt SeriesEarth Sciences Sector, Contribution Series 20140343
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS38; 39; 340; 48; 49; 340; 58; 59; 560; 68; 69; 78; 79; 88; 89; 98; 99
AreaSverdrup Basin; Canadian Artic
Lat/Long WENS-124.0000 -72.0000 82.0000 75.0000
Subjectsfossil fuels; geochemistry; hydrocarbons; hydrocarbon potential; depositional analyses; depositional environment; coal petrology; trace element geochemistry; Sverdrup Basin; Murray Harbour Formation; Mesozoic; Triassic
Illustrationslocation maps; histograms; plots; tables; photomicrographs
ProgramShale Reservoir Characterization, Geoscience for New Energy Supply (GNES)
AbstractThis study outlines the results from organic and inorganic geochemical and organic petrological analysis of the Middle Triassic Murray Harbour Formation. The Murray Harbour Formation is an organic-rich shale and siltstone unit located in the Sverdrup Basin in the Canadian Arctic. It has previously been identified as a major source rock in the basin and is investigated here as a potential unconventional reservoir. Core from three wells intersecting the Murray Harbour Formation is analyzed using Rock-Eval analysis, ICP-MS, and organic petrology to characterize the formation and interpret the depositional environment. Variations in organic matter abundance can be attributed mainly to amount of dilution of organic matter by clastic and allochthonous organic material, and to a lesser extent, the level of primary production of autochthonous organic material, and degree of preservation of organic material within sediments. TOC ranges between 0 and 4.8 wt.% and kerogen varies from Type I to Type III throughout the basin. The top of regressive systems tracts contain predominantly reworked, highly oxidized, allochthonous macerals and abundant coarser clastic material. The base of regressive systems tracts have the highest preservation of TOC, containing abundant labile primary kerogen and retained migrabitumen. Zr is used as a proxy for clastic input and reveals minimal dilution by mineral matter compared to adjacent low TOC intervals. The thermally mature portion of the base of the Ladinian regressive systems tract near the basin axis can be considered a prospective shale oil interval. Small-scale cyclic clastic influx episodes along the northern portion of the basin may be considered evidence for northerly-derived sediment from erosional runoff of the paleoterrane, Crockerland, during the Middle Triassic. Regionally, the variations in organic matter appear to be controlled by third-order stratigraphic sequences in the basin, resulting in changes to the factors responsible for organic matter deposition and preservation. The results and interpretations of this study can be applied to analogous fine-grained successions to determine their unconventional reservoir potential.
Summary(Plain Language Summary, not published)
This study examines the organic material in the Middle Triassic Murray Harbour Formation in the Canadian Arctic Island Archipelago. The purpose of the study is to identify the potential of the formation as an unconventional oil and gas resource.