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Thermal maturity of the Sverdrup Basin, Arctic Canada and its bearing on hydrocarbon potential

By
Keith Dewing
Keith Dewing
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Mark Obermajer
Mark Obermajer
Geological Survey of Canada, 3303 33rd St NW, Calgary AB T2L 2A7, Canada
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Published:
January 01, 2011

Abstract

Analysis of a large thermal maturity dataset indicates that the Carboniferous to Eocene Sverdrup Basin in the Canadian Arctic had a uniform response to thermal stress with depth for Mesozoic strata. Thermal maturity was established at the level of the widespread Upper Triassic Gore Point Member; a good seismic reflector, occurring in close vertical proximity to the two main oil-prone source rocks in the basin. The Gore Point Member is in the gas window (Ro>1.35%) in the northeastern part of the Sverdrup Basin, whereas in the western Sverdrup Basin its maturity does not exceed 1.2% Ro. This would support the hypothesis that large quantities of gas found at the Drake, Hecla and Whitefish fields have derived from a deeper source, probably in Permian or lower Palaeozoic strata. A normal burial curve is established using boreholes drilled in areas with no structural complexity at time of maximum burial. Low-amplitude structures, including the Drake, Hecla and Whitefish fields, show little or no uplift following maximum burial in the Paleocene, indicating that these structures formed prior to the Eocene folding related to the Eurekan Orogeny. Because they were present at the time of maximum burial, they were available to be charged during hydrocarbon migration. In contrast, high-amplitude structures show evidence of large uplifts following maximum burial. They formed in the Eocene and hence post-date most hydrocarbon migration.

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Contents

Geological Society, London, Memoirs

Arctic Petroleum Geology

Anthony M. Spencer
Anthony M. Spencer
Statoil, Norway
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Ashton F. Embry
Ashton F. Embry
Geological Survey of Canada, Canada
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Donald L. Gautier
Donald L. Gautier
United States Geological Survey, USA
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Antonina V. Stoupakova
Antonina V. Stoupakova
Moscow State University, Russia
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Kai Sørensen
Kai Sørensen
Geological Survey of Denmark and Greenland
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Geological Society of London
Volume
35
ISBN electronic:
9781862394100
Publication date:
January 01, 2011

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