Carbonate Sequence Stratigraphy and Petroleum Geology of the Jurassic Deep Panuke Field, Offshore Nova Scotia, Canada
John A. W. Weissenberger, Richard A. Wierzbicki, Nancy J. Harland, 2006. "Carbonate Sequence Stratigraphy and Petroleum Geology of the Jurassic Deep Panuke Field, Offshore Nova Scotia, Canada", Giant Hydrocarbon Reservoirs of the World: From Rocks to Reservoir Characterization and Modeling, P. M. (Mitch) Harris, L. J. (Jim) Weber
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PanCanadian Petroleum (now EnCana Corporation) discovered the deep Panuke field in 1998 with the drilling of the PP-3C well. The well was drilled in 90 m (295 ft) of water, 250 km (155 mi) southeast of Halifax, Canada. Subsequent delineation and development drilling has proven a significant gas accumulation.
The gas is trapped, by a combined structural-stratigraphic configuration, in the Upper Jurassic reefal and oolitic limestones and dolomites of the Abenaki Formation. The Jurassic carbonate platform on the Scotian Shelf was attached to a metamorphic hinterland, so that the sediments contain varying amounts of silic-iclastics. Abundant secondary porosity was encountered, ranging from leached matrix and intercrystalline to vuggy and/or cavernous. Textural, petrographic, and isotopic evidences suggest that deep burial and hydrothermal diagenetic processes caused the porosity. The gas is believed to have been sourced from adjacent Verrill Canyon Formation shales, whereas small amounts of hydrogen sulfide have been isotopically linked to synrift evaporites underlying the Abenaki.
The Abenaki is divided into seven third-order depositional sequences, the Abenaki V being the primary gas zone. These sequences have been regionally correlated using geology and a grid of two-dimensional seismic data. Three-dimensional seismic data was used in delineation drilling and reservoir characterization. Deep Panuke is the first, and remains at writing, the only significant hydrocarbon discovery in the Mesozoic carbonates of the continental shelf of eastern North America.