Preliminary organic petrography of Palaeozoic rocks from the Grand Banks,Newfoundland |
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| Authors: | F Goodarzi LR Snowdon PR Gunther WAM Jenkins |
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| Institution: | Institute of Sedimentary and Petroleum Geology, 3303-33rd Street, NW, Calgary, Alberta T2L 2A7, Canada;Petro-Canada, 40 Research Place NW, P.O. Box 2844, Calgary, Alberta T2P 3E3, Canada;Associated Biostratigraphic Consultants, Box 942, Station G, Calgary, Alberta T3A 3G2, Canada |
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| Abstract: | Samples of lower Palaeozoic bedrock from the Grand Banks of Newfoundland were examined using reflected light microscopy and Rock-Eval pyrolysis. These samples contained organic material which included bitumen (structureless organic material), acritarchs, chitinozoa, scolecodonts and graptolites. The reflectance of the organic material increased from acritarchs towards graptolites with bitumen showing a wide range of reflectance. Multiple phases of oil migration through one sample were inferred by examination of the bitumens: the lowest reflecting being more recent than the highest reflecting bitumen. Combined reflectance and Rock-Eval analysis indicate that these samples are mature to overmature. The two oldest samples (Arenig-Llanvirn, Ordovician) are assessed as mature and as having potential for generation of liquid hydrocarbons, but must be considered as mainly gas prone. |
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| Keywords: | Organic geochemistry Petrology Grand Banks Canada |
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