--> Abstract: Source Rock Maturity Modeling: Sable and Jeanne D'Arc Basins Offshore Eastern Canada, by M. A. Williamson and K. Desroches; #91012 (1992).

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ABSTRACT: Source Rock Maturity Modeling: Sable and Jeanne D'Arc Basins Offshore Eastern Canada

WILLIAMSON, MARK A., and KEVIN DESROCHES, Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada

Oil accumulations within the Jeanne d'Arc Basin are largely sourced by the Egret Member, a Kimmeridgian aged calcareous shale unit characterized by type II to I kerogen/amorphous organic matter. In the gas-prone Sable Basin, hydrocarbons are sourced from lean, lipid-poor type III kerogen disseminated throughout the thick pro-delta shale Verrill Canyon Formation (Jurassic). In order to understand hydrocarbon generation, expulsion, and migration within the source and reservoir systems, we have modeled source rock subsidence, compaction, and thermal and maturation histories. Our models allow mapping of the spatial and temporal development of maturity of the Egret Member and Verrill Canyon Formation. The models are based on data from some 70 exploration wells and 10 "dummy" wells (from se smic). Confidence in the accuracy of model predictions is based on calibrations with present-day observed vitrinite reflectance, corrected bottom-hole temperatures, sonic transit times (for porosity reduction), and detailed sensitivity analyses of assumptions used. Both basins show a very rapid subsidence during the Late Jurassic and Early Cretaceous as a response to rifting; large areas of the basins reached peak oil/gas maturity by 100 Ma. These maturity frameworks provide a quantitative platform for further modeling of the basins hydrocarbon charge histories.

 

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