scholarly journals Lower Cretaceous reservoir development in the North Sea Central Graben, and potential analogue settings in the Southern Permian Basin and South Viking Graben

2018 ◽  
Vol 469 (1) ◽  
pp. 479-504 ◽  
Author(s):  
Frank Zwaan
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Permian Basin ◽  
The North ◽  
Reservoir Development ◽  
The North Sea

Late Palaeozoic to Early Cenozoic geological evolution of the northwestern German North Sea (Entenschnabel): New results and insights

2014 ◽  
Vol 93 (4) ◽  
pp. 147-174 ◽  
Author(s):  
Jashar Arfai ◽  
Fabian Jähne ◽  
Rüdiger Lutz ◽  
Dieter Franke ◽  
Christoph Gaedicke ◽  
...  
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Late Jurassic ◽  
Structural Element ◽  
The North ◽  
Sedimentary Evolution ◽  
Basin Subsidence ◽  
The North Sea ◽  
Thickness Variations ◽  
Zechstein Salt

AbstractThe results of a detailed seismic mapping campaign of 13 horizons in the northwestern German North Sea, covering Late Permian to Palaeogene sedimentary successions, are presented. Based on the interpretation of four 3D and two 2D seismic surveys, thickness and depth maps of prominent stratigraphic units were constructed. These maps provide an overview of key structural elements, the sedimentation and erosion, and give insights into the evolution of the German Central Graben. The base of the Zechstein Group reaches a maximum depth of 7800 m within the German Central Graben. Lateral thickness variations in the Zechstein reflect the extensive mobilisation of Zechstein salt. Complex rift-related structures, with the Central Graben as the main structural element, were found not later than the Early Triassic. Up to 3000-m thick Triassic sediments are preserved in the eastern German Central Graben of which 1800 m consist of Keuper sediments. The Lower Buntsandstein unit shows increasing thicknesses towards the southeastern study area, likely related to distinct lateral subsidence. As a consequence of uplift of the North Sea Dome, Middle Jurassic sediments were eroded in large parts of the northwestern German North Sea and are only preserved in the German Central Graben. The NNW–SSE oriented John Basin is another important structural element, which shows maximum subsidence during the Late Jurassic. In most parts of the study area Lower Cretaceous sediments are absent due to either erosion or non-deposition. Lower Cretaceous deposits are preserved in the Outer Rough Basin in the northwest and within the German Central Graben. Upper Cretaceous sediments are found at depths between 1500 and 3600 m, reaching a maximum thickness of approximately 1600 m on the Schillgrund High. Contraction and inversion of pre-existing Mesozoic faults during the Late Cretaceous is distinct at the Schillgrund Fault, i.e. the eastern border fault of the Central Graben. The Palaeogene is predominantly a period of strong basin subsidence. Within 37 Myrs, up to 1400 m of Palaeogene sediments were deposited in the northwesternmost part of the study area. Detailed mapping of salt structures enables a reconstruction of halokinetic movements over time and a deciphering of the influence of the Zechstein salt on the sedimentary evolution during the Mesozoic and Cenozoic. Increasing sediment thicknesses in rim-synclines indicate that most of the salt structures in the German Central Graben had their main growth phase during the Late Jurassic.

scholarly journals Lower Cretaceous calcareous nannofossil biostratigraphy in the Danish Central Trough

1987 ◽  
Vol 20 ◽  
pp. 1-89
Author(s):  
Erik Thomsen
Keyword(s):  
North Sea ◽  
Lower Cretaceous ◽  
Calcareous Nannofossils ◽  
Northern Germany ◽  
The North ◽  
Lower Aptian ◽  
Upper Hauterivian ◽  
Central Trough ◽  
The North Sea ◽  
Calcareous Nannofossil Biostratigraphy

Calcareous nannofossils are described from Lower Cretaceous strata of four borings in the Central Trough of the Danish North Sea sector, and from three Aptian units on Helgoland and at Sarstedt, northern Germany. The assemblages range in age from Upper Hauterivian to Albian-?Cenomanian. Abundances of calcareous nannofossils varied considerably throughout the investigated sequences. They were rock-forming in several Lower Barremian - Aptian sediments, but rare or lacking in many of the Hauterivian and Albian strata. The Middle Barremian - Lower Aptian assemblages were often dominated by nannoconids. Preservation was generally bad in chalk and good in marl deposits. Some finely laminated black sediments yielded extremely well-preserved assemblages. One hundred and sixteen species were recognized. Eighteen species were selected as biostratigraphically particularly useful and their chronostratigraphic ranges are shown and discussed. The ages of the investigated sequences were determined on the basis of the selected nannofossil events. Some distinct sedimentary units in the North Sea could be correlated with time-equivalent formations in eastern England and northern Germany.

scholarly journals A Lower Cretaceous nannofossil zonation for the North Sea Basin

2001 ◽  
Vol 20 (1) ◽  
pp. 45-80 ◽  
Author(s):  
Jason Jeremiah
Keyword(s):  
New Species ◽  
North Sea ◽  
Lower Cretaceous ◽  
The North ◽  
The North Sea ◽  
The Uk ◽  
Central North Sea

Abstract. Analysis of cored sections from the Central North Sea Basin, boreholes from the onshore Netherlands and onshore sections from the UK and Germany has enabled a major reappraisal of Lower Cretaceous nannofossil datums. The Lower Albian to Upper Barremian interval has, in particular, been comprehensively amended. Five new species, Crucibiscutum bosunensis sp. nov., Crucibiscutum ryazanicum sp. nov., Lithraphidites houghtonii sp. nov., Seribiscutum dentatum sp. nov., Staurolithites palmula sp. nov. and one new sub-species, Biscutum constans cavum ssp. nov. are described.

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