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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
C.S.P.G. 1990 Convention, "Basin Perspectives"
Source-Rock Potential and Maturation of Jurassic-Cretaceous Sediments and their Relationships to Hydrocarbon Occurrence and Over-Pressuring, Offshore Nova Scotia [Abstract]
ABSTRACT
Organic facies and maturation studies of Jurassic-Cretaceous sediments from the various boreholes (Cohasset A-52, Cohasset D-42, Evangeline H-98, Louisbourg J-47, Sable Island E-48, Sable Island 0-47, South Venture 0-59, and Venture B-43) reveal various assemblages of macerals
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related to oxic, dysoxic, and partially anoxic organic associations. These variations in organic facies reflect source-rocks of Kerogen Type IIA-IIB, IIB, IIB-III, III, and III-IV. Liquid chromatography, isotope and gas chromatography of both low and high molecular weight hydrocarbons of the source rock extract, condensate, and crude oil show various types of organic input classifying them into different families. Fluorescence data indicate a possible extension of the oil-wet gas floor in the overmature (>1.4% Ro) zone, below 5400 m, because of overpressuring. Relationships between gas generation, vitrinite reflectance, and overpressuring are re-evaluated.
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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES
1 Global GeoEnergy Research, Dartmouth B3A 4S9
2 Geological Survey of Canada, Dartmouth B2Y 4A2
3 Geological Survey of Canada, Calgary T2L 2A7
Copyright © 2003 by The Society of Canadian Petroleum Geologists. All Rights Reserved.