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  • 1
    Publication Date: 1992-01-01
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 2
    Publication Date: 2016-04-08
    Description: Acoustic basement lies at an average of between 6.0 and 6.5 sec two-way time below sea level in the southern Rockall Trough and northern Porcupine Abyssal Plain. The overlying sedimentary succession reaches maximum thicknesses of at least 4.0 sec, and can be divided by 3 regionally-developed seismic reflecting horizons, which are used as a framework to establish an acoustic stratigraphy for the area by selecting three “type” seismic sections. These reflectors are named, in ascending order, Shackleton, Charcot and Challenger. The area is crossed by E—W basement high structures, the Clare Lineament (which may be an easterly extension of the Charlie Gibbs Fracture Zone), that separates the Porcupine Abyssal Plain from the eastern part of southern Rockall Trough. Under the latter, the post-Shackleton acoustic sequence is thickened, as if dammed to the north of the Clare Lineament, whilst a further thickening, above reflector Charcot, occurs along a NE—SW line somewhat farther north into the southern Rockall Trough. This can also be related to shallow-lying acoustic basement features. Pre-Shackleton sediments overlie a very irregular basement topography. The acoustic characters of the various sediment packages are described and it is speculated that major changes in the sedimentary environments took place across reflectors Shackleton and Challenger, the latter probably establishing the modern bottom current circulation patterns. No ages can be unequivocally assigned to the main reflectors, but previously published data suggest a late Eocene—Oligocene age for Challenger. Possible lavas or sills are identified in the succession between reflectors Shackleton and Charcot.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 1993-01-01
    Description: In recent years a substantial part of the Danish Central Graben has been covered by high-resolution 3D and 2D seismic data, and a detailed study of the various tectonic elements, their evolution through time and their importance for hydrocarbon trapping has been made possible. This has revealed that in many instances important structural trends affecting reservoir distribution or production characteristics can only be detected using high-resolution 3D seismic. The evidence is that the Triassic, Middle Jurassic, and basal Upper Jurassic graben trends were predominantly north-south. The area which is now the deepest part of the Tail End Graben was relatively high at these times. The NW trends of the Danish Central Graben are not, on the whole, an accentuation of an older (Triassic/Middle Jurassic) rift along the same direction, but are new trends coming into effect in the Kimmeridgian. These NW-SE trends controlled rifting, with peak activity in the Volgian. In conclusion, the structures of most Danish fields exhibit the superposition of several distinct structural episodes. A detailed understanding of the nature of the individual tectonic events is necessary for unravelling the deformation history, which is important knowledge both in exploration and production phases. The various examples from the Danish Central Graben demonstrate that this requires a degree of seismic resolution that has only recently become achievable.
    Electronic ISSN: 2047-9921
    Topics: Geosciences
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