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Abstract
Weissenberger, J. A. W., R. A. Wierzbicki, and N. J. Harland,
DOI:10.1306/1215883M883275
2006 by The American Association of Petroleum Geologists.
Carbonate Sequence Stratigraphy and Petroleum Geology of the Jurassic Deep Panuke Field, Offshore Nova Scotia, Canada
John A. W. Weissenberger,1 Richard A. Wierzbicki,2 Nancy J. Harland3
1Husky Energy Inc., Calgary, Alberta, Canada
2EnCana Corporation, Calgary, Alberta, Canada
3EnCana Corporation, Calgary, Alberta, Canada
ACKNOWLEDGMENTS
We thank EnCana Ltd. for giving permission to publish our work on deep Panuke and Husky Energy for additional support in completion of this publication. This paper would not have been written without the contribution of our many colleagues and associates who worked on various aspects of the project, and we beg the pardon of those we do not mention. J. A. W. Weissenberger thanks John Hogg and Ian DeLong for the opportunity to work with them on the project from the beginning. We must single out the contributions of our geophysicists, Garth Syhlonyk, Robert Riddy, and Rainer Tonn, who worked through the delineation and development phases, as well as engineers Tom Craig and John Slade. We must also acknowledge several colleagues who supported this project through their specialized work: Ihsan Al-Aasm (isotopes and fluid inclusions), Jeff Dravis (petrography and diagenesis), Les Eliuk and Bev Harris (drill-cuttings description), Bert van Helden (micropaleontology), and Ian Hutcheon (sulfur isotopes). Thanks again to John Hogg for critically reading the manuscript and to Phil Argatoff of Penta Graphix Ltd., who prepared many of the diagrams. The authors also appreciate the helpful comments of reviewers Sherry Becker, Niall Toomey, and Mitch Harris, which greatly improved the manuscript. Please note that the reference to proven reserves in the AAPG 2006 conference abstracts is withdrawn because it was included in error.
ABSTRACT
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 siliciclastics. 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.
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