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TitleIntegrated 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
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AuthorIssler, D R; Jiang, C; Reyes, J; Obermajer, M
SourceGeological Survey of Canada, Open File 8047, 2016, 94 pages, https://doi.org/10.4095/297905
Year2016
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNorthern offshore region; Northwest Territories
NTS107B; 107C; 107D/12; 107D/13; 107D/14; 107E/02; 107E/03; 107E/04
AreaBeaufort-Mackenzie Basin; Beaufort Sea; Mackenzie Delta; Tuktoyaktuk Peninsula
Lat/Long WENS-138.0000 -129.0000 71.0000 68.0000
Subjectsfossil fuels; stratigraphy; hydrocarbons; hydrocarbon potential; hydrocarbon maturation; vitrinite reflectance; petroleum exploration; exploration wells; gas chromatography; chromatography; mass spectrometer analysis; pyrolysis; Reindeer D-27 well; Tununuk K-10 well; Tarsiut-Amauligak fault zone; Taglu fault zone; Eskimo Lakes fault zone; Mesozoic; Cretaceous; Tertiary
Illustrationslocation maps; plots; profiles; tables; stratigraphic columns; graphs
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramMackenzie Corridor Project Management, GEM2: Geo-mapping for Energy and Minerals
Released2016 04 22
AbstractCore 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.
Summary(Plain Language Summary, not published)
Drill cuttings are the most common type of sample from petroleum wells and are used routinely for geochemical analyses for the Beaufort-Mackenzie region. These samples can be contaminated by drilling mud additives and mixing of cuttings from different depth intervals. Cores are higher quality samples but they are rare due to the expense of coring. The Reindeer D-27 and Tununuk K-10 wells were drilled in the onshore Mackenzie Delta during the 1960s when coring was more common. They have numerous cores from different stratigraphic intervals which allow for a comparison of the results of multi-parameter analyses for both sample types. Rock-Eval Tmax and S1 parameters are significantly different between cores and cuttings samples and these results provide a reference data set for interpreting legacy Rock-Eval data for cuttings samples from a large number of Beaufort-Mackenzie.
GEOSCAN ID297905