Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea
Zeitschrift: International Journal of Earth Sciences, 2015: -
DOI: https://doi.org/10.1007/s00531-015-1194-y
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6695
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/6695
Arfai, Jashar; Lutz, Rüdiger; Franke, Dieter; Gaedicke, Christoph; Kley, Jonas, 2015: Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea. In: International Journal of Earth Sciences, DOI: 10.1007/s00531-015-1194-y.
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The architecture of intra-chalk deposits in the
‘Entenschnabel’ area of the German North Sea is studied
based on 3D seismic data. Adapted from seismic reflection
characteristics, four types of mass-transport deposits
(MTDs) are distinguished, i.e. slumps, slides, channels and
frontal splay deposits. The development of these systems
can be linked to inversion tectonics and halotectonic movements
of Zechstein salt. Tectonic uplift is interpreted to
have caused repeated tilting of the sea floor. This triggered
large-scale slump deposition during Turonian–Santonian
times. Slump deposits are characterised by chaotic reflection
patterns interpreted to result from significant stratal
distortion. The south-eastern study area is characterised by
a large-scale frontal splay complex. This comprises a network
of shallow channel systems arranged in a distributive
pattern. Several slide complexes are observed near the Top
Chalk in Maastrichtian and Danian sediments. These slides
are commonly associated with large incisions into the sediments
below. Best reservoir properties with high producible
porosities are found in the reworked chalk strata, e.g. Danish
North Sea, therefore MTDs detected in the study area
are regarded as potential hydrocarbon reservoirs and considered
as exploration targets.
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- Geologie [930]