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TitreIntegrated analysis of vitrinite reflectance, Rock-Eval 6, gas chromatography, and gas chromatography-mass spectrometry data for the Reindeer D-27 and Tununuk K-10 wells, Beaufort-Mackenzie Basin, northern Canada
TéléchargerTéléchargements
AuteurIssler, D R; Jiang, C; Reyes, J; Obermajer, M
SourceCommission géologique du Canada, Dossier public 8047, 2016, 94 pages, https://doi.org/10.4095/297905
Année2016
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/297905
Mediaen ligne; numérique
Formatspdf
ProvinceRégion extracotière du nord; Territoires du Nord-Ouest
SNRC107B; 107C; 107D/12; 107D/13; 107D/14; 107E/02; 107E/03; 107E/04
Lat/Long OENS-138.0000 -129.0000 71.0000 68.0000
Sujetshydrocarbures; capacité de production d'hydrocarbures; maturation des hydrocarbures; réflectance de la vitrinite; exploration pétrolière; puits d'exploration; chromatographie en phase gazeuse; chromatographie; analyse par spectromètre de masse; pyrolyse; Puit Reindeer D-27 ; Zone de faille de Tarsiut-amauligak ; Zone de faille de Taglu ; Zone de faille d'Eskimo Lakes ; combustibles fossiles; stratigraphie; Mésozoïque; Crétacé; Tertiaire
Illustrationslocation maps; plots; profiles; tables; stratigraphic columns; graphs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de programme du corridor de Mackenzie, GEM2 : La géocartographie de l'énergie et des minéraux
Diffusé2016 04 22
Résumé(disponible en anglais seulement)
Core and cuttings samples were selected from the Reindeer D-27 and Tununuk K-10 wells for detailed Rock-Eval/TOC, vitrinite reflectance, gas chromatography, and gas chromatographymass spectrometry analysis as part of a regional thermal maturity study of the Beaufort- Mackenzie Basin in Arctic Canada. These deep and extensively cored wells, located at the southern end of Richards Island in the thrusted eastern margin of the Taglu Fault Zone (Tununuk High), provide a useful reference for interpreting new and legacy Rock-Eval data for cuttings samples that are known to be susceptible to contamination. Organic petrological observations and elevated Rock-Eval Tmax values indicate that recycled organic matter is common in the Iperk, Richards and Taglu sequences of the Reindeer D-27 well, and the Iperk, Aklak, Fish River and Arctic Red successions of the Tununuk K-10 well. Samples from both wells show evidence of contamination based on anomalous Rock-Eval pyrograms (e.g. multi-modal, asymmetric) and anomalous Rock-Eval parameters such Tmax, S1 and PI. For the Reindeer D-27 well, oil staining, hydrocarbon fluid inclusions, exudatinite (early and locally generated waxy oil from terrestrial organic matter) and bitumen have been observed in samples from the Taglu, Aklak and Arctic Red successions and these are associated with elevated PI and reduced Tmax values. Oil staining and bitumen have been observed in some samples from the Tununuk K-10 well also. Tmax values are low and decrease with increasing TOC content in the abundant, immature to marginally mature coal-rich samples of the Taglu Sequence in the Reindeer D-27 well. Some post-drilling contamination of samples is indicated by the presence of the plasticizer, dibutylphthalate (from plastic sample vials), in extracts of cuttings samples from the Reindeer D- 27 well. Although such contamination can contribute to anomalous Rock-Eval parameters, the observed elevated S1 values and reduced Tmax values for cuttings samples relative to core samples for both wells suggests that drilling mud additives are the main source of contamination.
Measured mean random reflectance for indigenous vitrinite varies from 0.37 %Ro (Richards Sequence) to 0.79 %Ro (Arctic Red Formation) for the Reindeer D-27 well and 0.39 %Ro (Aklak Sequence) to 1.30 %Ro (Arctic Red Formation) for the Tununuk K-10 well. The unconformably overlying Iperk Sequence in both wells is thermally immature and dominated by recycled vitrinite. Rock-Eval, apatite fission track, and biomarker (sterane and terpane) isomer ratio data provide independent confirmation of organic maturity levels. In accordance with previous published studies, petrological, Rock-Eval and organic geochemical data indicate that the Cretaceous Smoking Hills/Boundary Creek and Arctic Red Formations are dominated by marine (Type II) organic matter whereas the overlying mainly Cenozoic, deltaic sediments contain abundant terrestrially-derived organic matter (Type III). Thermal modelling, constrained using maturity and biomarker data, suggests that marine Cretaceous rocks in both wells entered the oil window at 135°C and reached peak generation at approximately 145°C during late Eocene-Oligocene time. The distribution of n-alkanes and alkyl naphthalenes in extracts of Taglu cuttings samples suggests that oil migrated from the Arctic Red Formation into the overlying Taglu and probably Aklak sequences in the Reindeer D-27 well. Good results are achieved using the new basin%Ro kinetic model for vitrinite reflectance with constant geothermal gradients equal to present values of 25.2°C/km and 28.6°C/km, and with pre-Iperk eroded thicknesses of 2200 m and 2300 m, for the Reindeer D-27 and Tununuk K-10 wells, respectively. The popular EASY%Ro kinetic model gives poorer results that may indicate a systematic miscalibration of vitrinite reflectance with respect to temperature for this model.
Résumé(Résumé en langage clair et simple, non publié)
Les déblais de forage représentent le type d'échantillon le plus courant à partir de puits de pétrole servant aux analyses géochimiques pour la région de Beaufort-Mackenzie. Ces échantillons peuvent être contaminés par des additifs de boues de forage et par le mélange de déblais provenant de différents intervalles de profondeur. Les carottes sont des échantillons de meilleure qualité, mais elles sont rares en raison des coûts liés aux travaux de carottage. Les puits Reindeer D-27 et Tununuk K-10 ont été forés dans les parties terrestres du delta du Mackenzie au cours des années 1960, lorsque les opérations de carottage étaient plus fréquentes. De carottes prélevées dans leurs différents intervalles stratigraphiques permettent de comparer les résultats des analyses à paramètres multiples pour les deux types d'échantillons. Des différences significatives sont observées pour les paramètres Rock-Eval Tmax et S1 entre les carottes et les échantillons de déblais. Ces résultats fournissent un ensemble de données de référence pour interpréter les données Rock-Eval héritées pour les échantillons de déblais provenant d'un grand nombre de puits dans la région de Beaufort-Mackenzie.
GEOSCAN ID297905