Middle Triassic strata of the Peejay field in northeastern British Columbia are composed of four regressive shorefaces, the youngest having been reworked by tidal inlets. Tidal-inlet sublitharenites and bioclastic grainstones form the best reservoir facies. These deposits form a series of shoreline-parallel, narrow, sharp-based, linear sand bodies that eroded the paleoshoreface. The orientation, geometry, and internal sedimentology of these tidal-inlet facies suggest that the paleoshoreline was subjected to a wave-dominated paleohydrographic regime. Determining the processes responsible for forming a specific tidal inlet can provide information regarding waves, tides, and storms characteristic of the depositional setting. Knowledge of this paleohydrographic regime can aid in predicting the orientation and internal characteristics of tidal-inlet reservoir facies. Improved predictability of reservoir facies geometry and quality can have direct implications on hydrocarbon exploration and development strategies of these and similarly formed hydrocarbon plays of the Triassic in the Western Canada sedimentary basin and elsewhere.

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