ABSTRACT

The Triassic beds of northeastern British Columbia contain important reservoirs of oil and gas. At present over fifty per cent of the gas reserves, and the main oil production in northeastern British Columbia, is found in the Triassic. Triassic production is found in four main areas. These are the Fort St. John gas field, the Milligan oil area, the Boundary Lake oil field, and the Jedney-Laprise gas field. The hydrocarbon accumulations of these areas can be related to the depositional history and post-depositional deformation of the Triassic.

Oil production in the Triassic is dependent upon porosity pinchouts due to lateral facies changes. The oil pools of the Milligan area produce from discrete sands which were deposited as beach bars. The Boundary Lake oil field produces from a shell bank deposit associated with evaporitic sediments.

The main Triassic gas reservoir is a dolomitized limestone reservoir at the top of the Triassic. Closure on the reservoir is provided by Laramide anticlinal folds.

New terminology is proposed for the lower Triassic. Two new formations -- the Montney and the Doig -- are assigned to the section below the Halfway Formation of the Schooler Creek Group. The two formations are termed the Daiber Group.

1 This manuscript is published through the permission of Imperial Oil Ltd. The paper was read May 26, 1960, before the A.A.P.G.-A.S.P.G. Third Western Canada Regional Meeting.

End_Page 35-------------------------