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TitreShale gas potential of Devonian shale in north Yukon: Results from a diamond drillhole study in western Richardson Mountains
AuteurFraser, T A; Allen, T L; Lane, L S; Reyes, J C
SourceYukon Geology Program, Yukon Exploration and Geology 2011, 2011 p. 45-74
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110357
Documentpublication en série
Lang.anglais
Mediapapier
ProvinceYukon
SNRC116G/09; 116G/10; 116G/11; 116G/12; 116G/13; 116G/14; 116G/15; 116G/16; 116H/09; 116H/10; 116H/11; 116H/12; 116H/13; 116H/14; 116H/15; 116H/16; 116I; 116J; 116O/01; 116O/02; 116O/03; 116O/04; 116O/05; 116O/06; 116O/07; 116O/08; 116P/01; 116P/02; 116P/03; 116P/04; 116P/05; 116P/06; 116P/07; 116P/08
Lat/Long OENS-140.0000 -136.0000 67.5000 65.5000
Sujetsroches sédimentaires; schistes; pyrolyse; hydrocarbures; capacité de production d'hydrocarbures; réflectance de la vitrinite; maturité organique; carbone organique; analyses par diffraction des rayons x; Groupe de Road River ; Formation de Canol ; Formation d'Imperial ; combustibles fossiles; Paléozoïque; Silurien; Dévonien; Carbonifère
Illustrationslocation maps; stratigraphic columns; photographs; tables; ternary diagrams
Programmebassins sédimentaires du Yukon, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Fresh diamond drill core samples from Paleozoic shale of the Road River Group and Canol and Imperial formations in the Richardson Mountains, immediately east of Eagle Plain basin, were analysed for Rock-Eval pyrolysis and total organic carbon content, organic petrology, and vitrinite reflectance to assess organic matter quantity, quality, and thermal maturity. X-ray diffraction was conducted to assess quartz, clay, and carbonate mineralogy. Samples are from three areas located along a north-trending strike length of 110 km.
All samples are overmature with respect to oil generation (1.89 to 3.86 %RoR). However, values systematically decrease southward along the mountain front through the dry gas window to the upper limit of the mixed wet/dry gas window (2.00 %RoR). Organic petrology identified abundant amorphous kerogen with lesser amounts of alginite-derived macerals, and Tasmanites alginite in both the Road River Group and Canol Formation while the Imperial Formation was organically lean. Total organic carbon values for the Canol Formation are 0.3 to 20.1 wt % with most samples containing2 to 5 wt % TOC. For the Road River Group, TOC values are 1.0 to 19.3 wt % with most less than5 wt %. The Imperial Formation TOC values are mainly below 1 wt %.
X-ray diffraction analyses indicate the succession is highly siliceous, particularly the Canol Formation with quartz values from 91 to 100%. Samples of the Imperial Formation are generally 82 to 90% quartz, while Road River Group samples are more variable with 62 to 96% quartz.
This study suggests that these strata have the potential to host unconventional hydrocarbons in the region under favourable burial conditions. Canol Formation and Road River Group strata have high TOC values and contain identifiable Type I and II organic macerals suggesting they may have been richer source rocks in the past. All strata are highly siliceous and thus good candidates for hydraulic fracture stimulation, with the Canol Formation the most mineralogically consistent of all strata examined.
A 2010 study of subsurface Canol and Imperial formation shale west of the study area indicates these formations are within the oil window, less thermally mature than in the Richardson Mountains. These results highlight the potential for natural gas and liquids in Devonian shale in Eagle Plain basin.
GEOSCAN ID289881