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SUBSIDENCE, CRUSTAL STRUCTURE, AND THERMAL EVOLUTION OF GEORGES BANK BASIN.

American Association of Petroleum Geologists Bulletin

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Abstract

A geographical study of Georges Bank basin defines a deep crustal structure that is interpreted in terms of the basin's tectonic and thermal history. Gravity models along three basin cross sections delineate two zones of crustal thinning at the basement hinge zone and oceanic crustal margins. These two zones bound rift-stage crust (about 25 km thick) which underlies the central portion of the basin. Subsidence analysis of the basin, using data from multichannel seismic reflection lines and two COST wells, suggests a rifting and (uniform) extensional origin. Two-dimensional finite difference modeling of the basin defines a crustal structure that concurs with the gravity and subsidence studies. The resulting isotherms show no major changes in the thermal structure since the Late Jurassic. In some areas of the basin, temperature sufficient for oil generation are determined from maturation studies of Jurassic sediments. Hydrocarbon generation is questionable, however, because of the probable lack of proper and sufficient kerogen in the Jurassic deposits.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
SUBSIDENCE, CRUSTAL STRUCTURE, AND THERMAL EVOLUTION OF GEORGES BANK BASIN.
Series title:
American Association of Petroleum Geologists Bulletin
Volume
71
Issue:
6
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Association of Petroleum Geologists Bulletin
First page:
702
Last page:
718
Number of Pages:
17