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NISKU (D-2) OVERVIEW
NISKU FORMATION OVERVIEW
The Nisku Formation or “D-2” occurs as a regional, shallow water ramp carbonate in the Leduc-Woodbend area at depths of approximately 1,500 m. Cyclic shoaling events are observed over the Leduc-Woodbend field, with depositional facies probably somewhat controlled by the underlying Leduc reef topography. The reservoir is dolomitized with variable quality occurring throughout the field.
The majority of Nisku wells overlying the Leduc build-up are designated as Nisku A Pool, which has produced 91 MMbbl of light (38° API) oil to date. The A Pool encompasses an area spanning portions of three Townships and at one time listed several hundred wells as active producers. Much of the Pool is unitized (Leduc-Woodbend D-2 Unit) and was water flooded until 1994. The Company has an 81.234575% working interest in the Unit and is the operator. The Unit has produced over 80 MMbbl and 100 Bcf to date. To the south of the A Pool, the Company also has lesser interests in the Nisku B Pool.
Due to its large areal extent and thickness (45-60 m), the Nisku Formation still has substantial remaining recoverable oil. There are currently only four Company interest wells producing from the zone including one recently re-completed well; recent development activities will add two more producers. Very little development occurred in the Nisku from 1986, when Imperial Oil conducted a successful five well stimulation program, until 2010 when the Company initiated a number of activities.
The Company has completed a comprehensive review of the Nisku zone to identify opportunity areas and develop a depletion plan for the remaining oil and gas in place. To identify areas of greatest potential the Company updated a historical study that sub-divided areas of Nisku production on the basis of reservoir quality and production performance (shown opposite). Several areas exhibit lower recovery to date and are the focus of the Company’s planned activities. The Company’s 3-D seismic coverage was also used to high grade opportunities. A robust inventory of opportunities includes an extensive infill drilling program, re-entry of abandoned D-3 wellbores and recompleting the D-2, and reentry of abandoned D-2 wells for recompletion and stimulation. The Company’s future capital program in the Nisku will add over 4,500 bbl/d (gross) of light oil production.
