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ABSTRACT: Generation and Previous HitMigrationNext Hit of Oils in the Jeanne d'Arc Basin, Offshore Eastern Canada

Previous HitFOWLERNext Hit, MARTIN G., Geological Survey of Canada, Calgary, Alberta, Canada, and K. DONALD MCALPINE* and MARK A. WILLIAMSON, Geological Survey of Canada, Dartmouth, Nova Scotia, Canada

Previous work shows that the major source rock of oils in the Jeanne d'Arc Basin is the Kimmeridgian-aged Egret Member of the Rankin Formation. Some oils in the Ben Nevis area have a different source that is probably within the Voyager Formation. In addition, some oils may have a contribution from an interval in the Jeanne d'Arc Formation; at Beothuk M-05 this may be the predominant source, although this unit and the Egret Member show very simialar chemical characteristics making it difficult to differentiate hydrocarbons sourced from these horizons.

Oils show a wide range of maturity, resulting partly from hydrocarbon generation at lower than normal temperatures. A comparison of the maturity of oils and source rocks based on biomarker and other data provides evidence for Previous HitmigrationNext Hit pathways within the basin, especially when used with models that predict maturity of the source rocks through time. Vertical Previous HitmigrationNext Hit via faults is important, leading in some locations to oils of similar maturity in stacked reservoirs. In other cases, stacked reservoirs contain oils of widely differing maturity, indicating different pulses of oil Previous HitmigrationNext Hit. At Trave E-87, condensates are found where the Egret Member is only marginally mature, suggesting longer distance lateral Previous HitmigrationTop.


AAPG Search and Discovery Article #91012©1992 AAPG Annual Meeting, Calgary, Alberta, Canada, June 22-25, 1992 (2009)