scholarly journals A note on the Early Cretaceous biostratigraphy (foraminifera) of borehole 49/24-1 (Shell/Esso) in the southern North Sea

1984 ◽  
Vol 3 (1) ◽  
pp. 1-10 ◽  
Author(s):  
S. Crittenden
Keyword(s):  
North Sea ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Southern North Sea

Abstract. Borehole 49/24-1 (Shell/Esso), which is the reference borehole for the Lower Cretaceous Cromer Knoll Group in the southern North Sea, is subdivided lithostratigraphically and biostratigraphically. The resulting stratigraphy is briefly compared to onshore U.K. outcrop and borehole sections of comparable age and lithofacies. The regional stratigraphical implications for the correlation of offshore and onshore sections of Lower Cretaceous (Albian) strata are briefly discussed.

scholarly journals Structural outline and development

1982 ◽  
Vol 8 ◽  
pp. 9-26
Author(s):  
Claus Andersen ◽  
Jens Christian Olsen ◽  
Olaf Michelsen ◽  
Erik Nygaard
Keyword(s):  
North Sea ◽  
Early Cretaceous ◽  
Southern North Sea ◽  
The North ◽  
Moray Firth ◽  
History Of ◽  
The North Sea ◽  
Broad Complex ◽  
East West ◽  
German Basin

The Central Graben is a broad, complex trough with a long history of differential subsidence. It was probably initiated in the Permian and was controlled by major rifting during the Mesozoic. To the south in the Dutch sector the trough is divided into two parts. From here it passes northwards and divides the southern North Sea Basin into the Anglo-Dutch Basin and the Northwest German Basin. It also separates the Mid North Sea High from the Ringkøbing-Fyn High. These highs form broad, east-west trending, relative stable ridges. The further continuation of the Central Graben is to the northwest, towards the centre of the North Sea, where it passes into the Viking Graben and the Moray Firth Basin at about 58° N. Where the Central Graben divides the two major highs, there is an elongate central narrow horst, the Dogger High, which is the southernmost of a row of mid-Graben highs. Both sides of the Graben are clearly defined by normal rotational faults that were intermittently active from Triassic to Early Cretaceous times.

scholarly journals Two new Early Cretaceous dinocyst species from the Central North Sea Basin

2002 ◽  
Vol 21 (1) ◽  
pp. 75-80 ◽  
Author(s):  
S. Duxbury
Keyword(s):  
New Species ◽  
North Sea ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Early Miocene ◽  
Late Oligocene ◽  
Two New Species ◽  
Central North Sea

Abstract. Two new species of dinocyst, Cerbia monilis and Hapsocysta susanae are described from the Lower Cretaceous of the Central North Sea Basin. The first ranges across the Aptian/Albian boundary and the latter is restricted to the Early to Middle Albian interval; both are valuable index taxa in this area. Hapsocysta susanae is remarkably similar to cysts ‘without walls’ described from the Late Oligocene and Early Miocene, and detailed comparisons are made. The ranges of the two species described here are illustrated against regional lithostratigraphic and biostratigraphic schemes.

Exploration play statistics in the Southern North Sea region of The Netherlands and UK

2021 ◽  
pp. SP494-2020-200
Author(s):  
David G. Quirk ◽  
Stuart G. Archer
Keyword(s):  
The Netherlands ◽  
North Sea ◽  
Lower Cretaceous ◽  
Lower Jurassic ◽  
Petroleum Exploration ◽  
Upper Carboniferous ◽  
Northern Margin ◽  
Southern North Sea ◽  
Average Size ◽  
Zechstein Salt

AbstractThis paper presents the historical results of onshore and offshore petroleum exploration in the Anglo-Dutch Basin of the Southern North Sea. A total recoverable resource of 220 tcfe has been discovered within a contiguous area of 85,000km2, 73% of which occurs in The Netherlands. The resource is predominantly gas (207 tcf), sourced from Upper Carboniferous coals, although the youngest play is oil, sourced from Lower Jurassic shales.There are five plays, partitioned by late Permian-age (Zechstein) salt. In terms of discovered resource they are ranked 1) Rotliegend aeolian-fluvial sandstones (443 gas discoveries, 417 bcfe average size), 2) Triassic fluvial sandstones (101 gas discoveries, 140 bcfe average), 3) Lower Cretaceous paralic-shallow marine sandstones (61 oil discoveries, 29 MMboe average), 4) Westphalian fluvial sandstones (70 gas discoveries, 88 bcfe average), and 5) Zechstein carbonates (51 gas discoveries, 83 bcfe average). Although the main Rotliegend fairway is mature, there are probably discoveries yet to be made in the Westphalian and Zechstein plays and possibly within the Triassic and Lower Cretaceous plays. There is also potential to extend the Rotliegend play beyond where it is proven, for example along the northern margin of the basin and towards its centre

scholarly journals Upper Jurassic – Lower Cretaceous of the Danish Central Graben: structural framework and nomenclature

2003 ◽  
Vol 1 ◽  
pp. 231-246 ◽  
Author(s):  
Peter Japsen ◽  
Peter Britze ◽  
Claus Andersen
Keyword(s):  
North Sea ◽  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Late Jurassic ◽  
Upper Jurassic ◽  
The South ◽  
Structural Element ◽  
Maximum Thickness ◽  
The North ◽  
Half Graben

The Danish Central Graben is part of the mainly Late Jurassic complex of grabens in the central and southern North Sea which form the Central Graben. The tectonic elements of the Danish Central Graben in the Late Jurassic are outlined and compared to those in the Early Cretaceous based on reduced versions of published maps (1:200 000), compiled on the basis of all 1994 public domain seismic and well data. The Tail End Graben, a half-graben which stretches for about 90 km along the East North Sea High, is the dominant Late Jurassic structural feature. The Rosa Basin (new name) is a narrow, north–south-trending basin extending from the south-western part of the Tail End Graben. The Tail End Graben ceased to exist as a coherent structural element during the Early Cretaceous and developed into three separate depocentres: the Iris and Gulnare Basins to the north and the Roar Basin to the south (new names). The Early Cretaceous saw a shift from subsidence focused along the East North Sea High during the Late Jurassic to a more even distribution of minor basins within the Danish Central Graben. The depth to the top of the Upper Jurassic – lowermost Cretaceous Farsund Formation reaches a maximum of 4800 m in the northern part of the study area, while the depth to the base of the Upper Jurassic reaches 7500 m in the Tail End Graben, where the Upper Jurassic attains a maximum thickness of 3600 m. The Lower Cretaceous Cromer Knoll Group attains a maximum thickness of 1100 m in the Outer Rough Basin.

Detrital zircon geochronology and heavy mineral analysis as complementary provenance tools in the presence of extensive weathering, reworking and recycling: the Neogene of the southern North Sea Basin

2021 ◽  
pp. 1-13
Author(s):  
Jasper Verhaegen ◽  
Hilmar von Eynatten ◽  
István Dunkl ◽  
Gert Jan Weltje
Keyword(s):  
North Sea ◽  
Chemical Weathering ◽  
Heavy Mineral ◽  
Mineral Analysis ◽  
Provenance Analysis ◽  
Detrital Zircon Geochronology ◽  
Southern North Sea ◽  
Variable Heavy ◽  
Mineral Data ◽  
Heavy Mineral Analysis

Abstract Heavy mineral analysis is a long-standing and valuable tool for sedimentary provenance analysis. Many studies have indicated that heavy mineral data can also be significantly affected by hydraulic sorting, weathering and reworking or recycling, leading to incomplete or erroneous provenance interpretations if they are used in isolation. By combining zircon U–Pb geochronology with heavy mineral data for the southern North Sea Basin, this study shows that the classic model of sediment mixing between a northern and a southern source throughout the Neogene is more complex. In contrast to the strongly variable heavy mineral composition, the zircon U–Pb age spectra are mostly constant for the studied samples. This provides a strong indication that most zircons had an initial similar northern source, yet the sediment has undergone intense chemical weathering on top of the Brabant Massif and Ardennes in the south. This weathered sediment was later recycled into the southern North Sea Basin through local rivers and the Meuse, leading to a weathered southern heavy mineral signature and a fresh northern heavy mineral signature, yet exhibiting a constant zircon U–Pb age signature. Thus, this study highlights the necessity of combining multiple provenance proxies to correctly account for weathering, reworking and recycling.

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