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TitleNatural thermogenic gas seeps at the front of the Richardson Mountains: indications for a petroleum system in Peel Plateau, Yukon, Canada
AuthorAllan, T L; Osadetz, K G
SourceBulletin of Canadian Petroleum Geology vol. 61, no. 4, 2013 p. 283-294,
Alt SeriesEarth Sciences Sector, Contribution Series 20120020
Mediapaper; on-line; digital
File formatpdf
NTS106F/15; 106F/16; 106K/03; 106K/04; 106K/05; 106K/06; 106K/11; 106K/12; 106K/13; 106K/14; 106L/01; 106L/02; 106L/07; 106L/08; 106L/09; 106L/10; 106L/15; 106L/16
AreaPeel Plateau; Richardson Mountains
Lat/Long WENS-135.0000 -133.0000 67.0000 65.8333
Subjectsfossil fuels; gas seeps; hydrocarbons; hydrocarbon potential; petroleum resources; petroleum exploration
Illustrationslocation maps; photographs; stratigraphic columns; tables; profiles
ProgramGEM: Geo-mapping for Energy and Minerals Yukon Sedimentary Basins
Released2014 02 24
AbstractPeel Plateau Yukon Territory is an under-explored potential petroleum region, where drilling during the 1960-70s identified natural gas shows in the upper Paleozoic succession. New fieldwork has identified natural gas seeps near the Trevor fault, a major structural element at the eastern Richardson Mountains front. One seep occurs where Trail River crosses the deformation front (66º28', 135º08.3') and the other, 45 km along strike of the deformation front, is associated with kushka at Turner Lake (66º10.3', 134º18.5'). Both samples contain CH4, CO2 and H2S. The Trail River sample has methane and carbon dioxide isotopic compositions (d13CCH4 = -42.8 ' and d13CCO2 = -14.9 ') generally similar to thermogenic gases and specifically like Lower Cretaceous Mannville Group gases in the Western Canadian Sedimentary Basin. The Turner Lake sample isotopic composition (d13CCH4 = -35.2 ' and d13CCO2 = -31.7 ') is inferred originally similar to the Trail River gas, but it was subsequently mildly oxidized microbially. We speculate that trace amounts of H2S are attributable to thermochemical sulphate reduction, consistent with the stratigraphic occurrence of natural gas and patterns of thermal maturity in nearby wells. This suggests both gases have a Paleozoic petroleum source rocks. The results indicate an effective thermogenic petroleum system, with probable Paleozoic petroleum source rocks for Peel Plateau. The association with Trevor Fault on the margin of the Richardson Mountains is reminiscent of petroleum seeps associated with major petroleum fields at Turner Valley, Waterton and Norman Wells. Recent work by others shows untested prospective structures in Peel Plateau, including one below the Turner Lake seep. These seeps, combined with new structural interpretations provide incentive to evaluate further the inferred petroleum potential of Peel Plateau.

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