2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 54-4
Presentation Time: 9:45 AM

STRATIGRAPHIC ARCHITECTURE OF THE MIDDLE TRIASSIC UPPER DOIG, HALFWAY AND LOWER CHARLIE LAKE FORMATIONS


GEGOLICK, Aimee1, HUBBARD, Stephen M.2, MOSLOW, Thomas F.2 and ZONNEVELD, John-Paul3, (1)Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada, (2)Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, Canada, (3)Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada

Tommy Lakes Field is located in northeastern British Columbia is the northernmost, and one of the largest Middle Triassic gas field in the Western Canada Sedimentary Basin. Hydrocarbons at Tommy Lakes are produced primarily from the Halfway Formation although some hydrocarbons are also produced from the Doig and Charlie Lake formations. The Tommy Lakes Field, and adjacent areas, is penetrated by approximately 250 wells, with 90 of these characterized by core.

The upper Doig Formation, Halfway Formation and lower Charlie Lake formations comprise components of a mixed clastic-carbonate proximal offshore, shoreface and marginal marine succession deposited on the northwestern margin of Pangaea.

The upper Doig Formation is characterized by sandy bioclastic grainstone that incises into bioturbated siltstone and shale. Local fault scarps acted as sediment traps in the western part of Tommy Lakes Field. The basal contact of the Halfway formation comprises a regional unconformity that is correlatable from the study area into the outcrop belt to the west. The basal beds of the Halfway Formation comprise a thin transgressive systems tract. The beds comprise the base of a thick regressive succession interpreted as a highstand systems tract. The Lower Charlie Lake Formation comprises the upper component of this highstand systems tract. A thin bioclastic limestone succession, referred to informally as the ‘A-marker’ horizon comprises a coplanar lowstand surface of erosion/transgressive surface of erosion and caps the study interval.

Sequence architecture is strongly influenced by regional tectonics. Reservoir units within the upper Doig Formation are partially constrained within asymmetrical fault scarp basins. The Halfway Formation thins rapidly to the east and is dramatically overthickened to the west where anomalous thickness changes denote the occurrence of north-south trending grabens that are interpreted to have been active from the Lower Triassic through the Upper Triassic in the study area.

Session No. 54

Sediments, Carbonates (Posters)
Sunday, 19 October 2014: 9:00 AM-5:00 PM
Exhibition Hall C (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.148
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