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Structural and Stratigraphic Evolution of the Barents Sea
Seismic interpretation and recent drilling results have led to the recognition of nine sequences in the Barents Sea: 1. Upper Devonian-Lower Carboniferous; 2. Middle-Upper Carboniferous; 3. Lower Permian; 4. Upper Permian; 5. Triassic-Lower Jurassic; 6. Middle Jurassic; 7. Upper Jurassic-Lower Cretaceous; 8. Upper Cretaceous-Paleocene; 9. Eocene-Oligocene.
Upper Devonian-Lower Carboniferous strata were deposited in northeast trending grabens. From Middle Carboniferous to Early Permian platform carbonates were deposited in a tectonically quiet basin. During Late Permian clastic sediments derived from the southeast prograded into the basin.
Stable tectonic conditions continued throughout the Triassic and Early Jurassic and clastic sediments were deposited during this time. Lower Triassic sediments were derived from the southeast whereas Upper Triassic-Lower Jurassic sediments were derived from both the southwest and northeast. Basinward progradation of the clastic strata is clearly seen on the seismic records.
In Middle and Late Jurassic Kimmerian wrench fault tectonics resulted in widespread faulting in the northwestern portion of the Barents Sea. Several basins, separated by ridges, were formed and both normal and strike-slip faulting occurred along the basin flanks. The faults were reactivated in Early Cretaceous and earliest Tertiary.
Upper Triassic to Middle Jurassic sandstones contain oil and gas trapped in block fault structures. Middle-Upper Jurassic shales and marls form the cap rocks. Probable source rocks for the hydrocarbons include Upper Jurassic shale for oil and gas and Triassic-Lower Jurassic shale for gas.
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