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TitleLandry Formation of Kugaluk N-02 well (Devonian, northern mainland NWT): insight into formation's boundaries, lithofacies, and stratal stacking patterns
 
AuthorKabanov, P BORCID logo
SourceBulletin of Canadian Petroleum Geology vol. 62, no. 2, 2014 p. 105-124, https://doi.org/10.2113/gscpgbull.62.2.105
Image
Year2014
Alt SeriesEarth Sciences Sector, Contribution Series 20130202
PublisherGeoScienceWorld
Documentserial
Lang.English
Mediaon-line; digital; paper
File formathtml; pdf
ProvinceNorthwest Territories
NTS107A
Lat/Long WENS-132.0000 -130.0000 69.0000 68.0000
Subjectsstratigraphy; geophysics; lithofacies; stratigraphic correlations; stratigraphic analyses; depositional environment; disconformities; sedimentary rocks; paleosols; tectonic setting; seismic interpretations; unconformities; cores; fossils; lithology; Kugaluk N-02 well; Landry Formation; Headless Member; Devonian
Illustrationsgeological sketch maps; photographs
ProgramGEM: Geo-mapping for Energy and Minerals Mackenzie Delta and Corridor
Released2014 07 07
AbstractThe CPOG Kugaluk N-02 well drilled east of Inuvik (the northern Mackenzie River valley) preserves an essentially complete stratigraphic record of the Devonian Landry Formation. Detailed examination of the core demonstrates that the contact between the Landry Formation and the overlying Headless Formation is gradational and conformable, recording upward deepening. The Landry Formation is 216 m thick and composed of characteristic metre-scale peritidal T-R sequences. The highstand end of the facies spectrum is composed of shallow-subtidal fossiliferous packstones, grainstones, and minor tabulate-coral boundstones. The shallowest marine parts of sequences are notably thick (30% of the total succession) and represented by laminated tidal-flat calcimudstones, calcisiltites, and birds-eye dismicrites with occasional supratidal brecciation. Rooted and synsedimentary pedogenized palustrine calcimudstones are recognized in initial-transgressive parts of sequences. The sequences are bounded by disconformities with paleokarst profiles of different depths and degree of host-rock weathering. The log combining lithofacies and subaerial exposure profiles reveals hierarchical 4th to 5th order cyclicity with inferred amplitudes of sea-level fluctuations ranging between 10 and 20 metres. This high-frequency cyclicity may have glacioeustatic origin, which is consistent with the relatively cool (22°C in average) surface tropical waters of the late Emsian-Givetian Ocean. The base of the Landry Formation is gradational and spatially diachronous, defined by a downward increase in dolomite content and limestone-dolostone interbedding. A thick paleosol near the base of Landy Formation may have potential for regional allostratigraphic correlations.
Summary(Plain Language Summary, not published)
The Kugaluk N-02 well from northern Mackenzie River Corridor with nominally 100% core coverage of the Devonian reveals the conformable and gradational Landry/Headless contact. The Landry Limestone is 216 m thick and composed of meter-scale peritidal cycles/sequences. These sequences are bounded by paleokarst disconformities and show facies spectrum ranging from shallow subtidal packstones to tidal-flat laminites and palustrine limestones. A reasonable allostratigraphic boundary close to the Landry base is seen in the major disconformity at 1166 m TVD and represented by a thick paleosol breccia and karstified bedrock.
GEOSCAN ID293013

 
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