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TitreGeological and geochemical data from the Canadian Arctic Islands. Part XII: descriptions and lithologs of Upper Paleozoic core
TéléchargerTéléchargements
AuteurKabanov, P B; Dewing, K E
SourceCommission géologique du Canada, Dossier public 7569, 2014, 121 pages, https://doi.org/10.4095/293754
Année2014
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/293754
Medianumérique; en ligne
Référence reliéeCette publication est reliée à les publications suivantes
Liensreadme
Formatspdf
ProvinceNunavut
SNRC47G; 47H; 48A; 48B; 48C; 48D; 49G; 49H; 57H; 58; 68D; 68E; 68G; 68H; 69A; 69B; 69C; 69F; 69G; 78F; 78G; 78H; 79; 88B; 88C; 88F; 88G; 88H; 89; 98
Lat/Long OENS-124.0000 -82.0000 80.0000 72.0000
Sujetslithologie; échantillons carrotés; descriptions de carottes; pétrophysique; analyses du pétrole; hydrocarbures; exploration pétrolière; puits d'exploration; trous de mine; bassins sédimentaires; roches sédimentaires; Puit Chads Creek B-64 ; Puit Jameson Bay C-31 ; Puit Satellite F-68 ; Puit Graham C-52 ; Puit Brock C-50 ; Puit Pollux G-60 ; Puit Isachsen J-37 ; Bassin de Sverdrup ; Formation de Kanguk ; Formation d'Hassel ; Formation de Christopher ; Formation d'Isachsen ; Formation de Mcconnell Island ; Formation de Ringnes ; Formation de Deer Bay ; Formation de Jameson Bay ; Formation de Barrow ; Formation d'Heiberg ; Groupe de Schei Point ; Formation de Blind Fiord ; Formation de Bjorne ; combustibles fossiles; géochimie; Phanérozoïque; Mésozoïque; Paléozoïque
Illustrationslocation maps; tables; stratigraphic sections; stratigraphic columns; stratigraphic correlations; logs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeBassin sédimentaire Sverdrup, GEM : La géocartographie de l'énergie et des minéraux
Diffusé2014 05 12 (13:00)
Résumé(Sommaire disponible en anglais seulement)
The core, mostly from Pennsylvanian - Permian strata, and 415 m in total reported thickness, contains sandstone, limestone, dolostone, shale, chertstone, conglomerate, anhydrite, salt, and diabase. Table 1 is a list of the examined core and their stratigraphic range. Pollux G-60 penetrated deep into the folded and metamorphosed pre-Ellesmerian basement (cores from 3368-3373.2 m and 3423.8-3428.7 m). Core 4681.7-4690.6 m from Drake Point D-68 intersects the Cretaceous(?) diabase sill, and core from Hoodoo L-41 recovered diabase from 2836.8-2839.8 m MD. Measured cores mostly represent short sections not exceeding 18.5 m in thickness (one core run or two short core runs). Most cores are visually tight. Out of 52 cores, porosity was observed in 11 (Table 1), and mostly it is patches of low to moderate matrix porosity in sandstone. Low to moderate matrix porosity is also present in two limestones from Marryatt K-71: in top of the bryozoan boundstone of the core 4707- 4725.5 m (Van Hauen Formation) and at 4943.0-4945.50 m (Belcher Channel Formation). Of the 11 occurrences of porous rocks, oil impregnation was observed in five: sandstones from 4677.2-4681.7 m and 4681.7-4690.6 m in the Drake Point D-68 well, limestones from 4943.0-4945.5 m and 4707- 4725.5 m in the Marryatt K-71 well, and interbeds of microporous dolomite in the dolomite-anhydrite unit from 2239-2255.8 m in the Buckingham O-68 well. There are 20 occurrences of relatively thick (over 2 m) shale or shale-dominated intervals in the 52 measured cores (Table 1). The slaty rocks from the pre-Ellesmerian basement at Pollux G-60, although being originally shales, are not included in this number. Three gradational classes of shales are recognized: (1) dark gray or black laminated shales with a bioturbation index (BI) not exceeding 2; (2) dark gray shales with more intense bioturbation patterns (BI over 2) and commonly containing benthic fossils; and (3) mottled, commonly reddened shales with visually degraded coaly detritus. The first group, deposited in a dysoxic to anoxic setting, is the most interesting target for shale hydrocarbon exploration. The second group has slightly lower values of organic carbon because of higher degree of syndepositional decomposition of organic matter. The third group was likely exposed to vadose processes during sea level lowstands resulting in the loss of most of its organic matter through aerobic degradation. Only two laminated black shales with BI 2 and below have been encountered: core 5449.00-5453.20 m in Marryatt K-71 and core 3743.6-3753.3 m in Depot Point L-24 (Table 1). Several subaerial unconformities were intersected by core. In the overlying Pennsylvanian-Permian succession, the most mature weathering profiles were encountered close to 3061.7 m in the Graham C- 52 well and at 2460.8 m in the Depot Island C-44 well. In Graham C-52, the top of the weathering profile must occur several centimeters above the core top. The thickness of dolomitized breccia, claystone, and calcrete in this profile approaches 3.5 m. At 2460.8 m in Depot Island C-44, the unconformity has an angular aspect. The core from 4945.50-4948.03 m of Marryatt K-71 is rich in Microcodium up to complete replacement of original texture indicating subaerial surface somewhere above this level. Position of this unconformity remains unclear because of the obliterating burial diagenetic imprint in the overlying microporous part of this core (“chalky” porosity at 4943.0-4945.50 m). Less developed paleosol is identified at 2170.2-2173.5m in Satellite F-68. Features indicating possible development of paleosols are also found at 1657 m in Depot Island C-44, 1985.2 m in Sandy Point L-46, and probably at 1790.45 m in the latter well.
Résumé(Résumé en langage clair et simple, non publié)
L'inventaire des carottes traversant le Paléozoïque supérieur (sur une longueur totale de 415 m) montre du grès, du calcaire, de la dolomie, du schiste, de la chaille, du conglomérat, de l'anhydrite, du sel et de la diabase. Les carottes mesurées présentent surtout de courtes sections n'excédant pas 18,5 m. Dans 11 des 52 carottes, nous avons observé des sections poreuses surtout constituées de grès dont la matrice avait une porosité de basse à modérée. Nous avons trouvé des imprégnations de pétrole dans cinq grès et carbonates poreux. Nous avons trouvé vingt occurrences de schistes ou d'intervalles dominés par les schistes relativement épais (plus de deux mètres). Trois classes progressives de schistes sont reconnues : (1) des schistes laminés gris foncé ou noirs dont l'indice de bioturbation (IB) ne dépasse pas 2; (2) des schistes gris foncé montrant un schéma de bioturbation plus intense (IB supérieur à 2) et contenant fréquemment des fossiles d'organismes benthiques; (3) des schistes bigarrés habituellement rouges montrant des détritus charbonneux visiblement dégradés. Le premier groupe, déposé dans un milieu hypoxique ou anoxique, est la cible la plus intéressante pour la prospection d'hydrocarbures de schiste.
GEOSCAN ID293754