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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Geology of the Georges Bank Basin, Offshore New England *
By
*Adapted from a paper presented by Leslie K. Schultz and R. L. Grover at Eastern Section A.A.P.G. Symposium, Atlantic City, New Jersey, April 23-25, 1973 and now in press Bulletin, AAPG.
The Georges Bank Basin is a basement depression with the deepest area being
an arcuate trough approximately 120 miles in length. The basin is centered about
41° N. Lat., 68° W. Long. The deepest part of the basin contains approximately
26,000 feet of Mesozoic and Cenozoic sediments. This estimate is based on interpretation
of geophysical data utilizing new velocity information from wells drilled
on the western Scotian Shelf.
Overall stratigraphic similarity to rocks in the western Scotian Shelf is likely.
The Jurassic section in the Georges Bank Basin is probably thicker than the western
Scotian Shelf equivalent and is composed of predominantly marine units. Examination
of geophysical data indicates the existence of more than 14,000 feet of Lower
Cretaceous and Jurassic carbonates, marine shales, evaporites and consolidated
sands. Salt diapirs similar to those in the Scotian Shelf have not been detected.
Structural deformation is apparent in basement rocks in the Georges Bank Basin and
consists of high angle normal faulting. Sediments form a southward thickening
wedge beneath the continental shelf.
Estimates of recoverable oil and gas from sediments beneath the continental
shelf and continental slope have been made by petroleum industry groups and federal
agencies. The 30,000 cubic miles of Lower Cretaceous and Jurassic sediments
in Georges Bank Basin may contain a significant share of these hydrocarbon reserves,
assuring the basin a favorable place among eastern North America's frontier exploration
areas.
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