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OFR 2018-01

Outcrop of the Middle Devonian Keg River Formation on the Firebag River, Northeastern Alberta (NTS 74E/11)

Abstract: This report contains the description of an outcrop of the Middle Devonian Keg River Formation along the north bank of the Firebag River west of the Fort Chipewyan winter road bridge. Field descriptions were supplemented with the results of thin-section analyses carried out on six samples from the outcrop, providing additional information on composition, textures, and porosity of the rocks. The outcrop consists of a basal unfossiliferous dolostone containing no other defining features, a series of laminated and tabular-bedded dolostone beds originating from a lagoonal to intertidal paleoenvironment and a capping stromatoporoid-biostromal to -biohermal dolostone. Post-depositional alteration processes interpreted from outcrop and thin-section observations include marine cementation, recrystallization, dolomitization, dissolution, fracturing, hydrocarbon migration, and late-stage calcite cementation. Dolomitization of the original limestone obscured, but did not completely obliterate original sedimentary structures. Observed porosity types include inter- and intraparticle, intercrystalline, and solution-enlarged porosity. Porosity values range between 10% and 46%, with the values of >20% found in dolomitized peloidal and fragmental grainstone and stromatoporoid bindstone in the biostromal to biohermal part of the outcrop.   Place Keywords 74d alberta canada firebag river fort mckay fort mcmurray Theme Keywords depositional environment devonian dolomite elk point group geology keg river formation porosity

Schneider, C.L.  Grobe, M.  Leighton, L.R.  2018-02-01

OFR 2018-11

Three-Dimensional Property Modelling of the Duvernay Formation

The skeleton of the 3D models builds on the work from the 3D Provincial Geological Framework Model of Alberta V.1 (3D PGFM v1) for the Duvernay Formation with more detailed internal architecture and modelled properties including; petrophysical ... Show Abstract

Marshall, F.H.  Corlett, H.  Lyster, S.  Berhane, H.  2019-03-28

OFR 2018-10

Three-Dimensional Property Modelling of the Montney Formation in Alberta

The model area is approximately 88,000 km2 and is bounded by the Alberta-British Columbia border in the west, the deformation edge associated with the Rocky Mountains to the southwest, and the erosional edge of the Montney Formation to the north and ... Show Abstract

Lyster, S.  Marshall, F.H.  Playter, T.L.  Berhane, H.  2019-03-28