scholarly journals Syn‐rift sediment gravity flow deposition on a late jurassic fault‐terraced slope, northern north sea

2021 ◽  
Author(s):  
Fabian Tillmans ◽  
Robert L. Gawthorpe ◽  
Christopher A‐L. Jackson ◽  
Atle Rotevatn
Keyword(s):  
North Sea ◽  
Late Jurassic ◽  
Gravity Flow ◽  
Sediment Gravity Flow ◽  
Northern North Sea

AN EARLY CRETACEOUS SOURCE ROCK IN THE KENDREW TERRACE, DAMPIER SUB-BASIN?

1996 ◽  
Vol 36 (1) ◽  
pp. 477 ◽  
Author(s):  
S. Ryan-Grigor ◽  
C. M. Griffiths
Keyword(s):  
Source Rock ◽  
North Sea ◽  
Early Cretaceous ◽  
Late Jurassic ◽  
Large Scale ◽  
Free Water ◽  
Organic Content ◽  
Source Rocks ◽  
The North ◽  
Northern North Sea

The Early to Middle Cretaceous is characterised worldwide by widespread distribution of dark shales with high gamma ray readings and high organic contents defined as dark coloured mudrocks having the sedimentary, palaeoecological and geochemical characteristics associated with deposition under oxygen-deficient or oxygen-free bottom waters. Factors that contributed to the formation of the Early to Middle Cretaceous 'hot shales' are: rising sea-level, a warm equable climate which promoted water stratification, and large scale palaeogeographic features that restrict free water mixing. In the northern North Sea, the main source rock is the Late Jurassic to Early Cretaceous Kimmeridge Clay/Draupne Formation 'hot shale' which occurs within the Viking Graben, a large fault-bounded graben, in a marine environment with restricted bottom circulation and often anaerobic conditions. Opening of the basin during a major trans-gressive event resulted in flushing, and deposition of normal open marine shales above the 'hot shales'. The Late Callovian to Berriasian sediments in the Dampier Sub-basin are considered to have been deposited in restricted marine conditions below a stratified water column, in a deep narrow bay. Late Jurassic to Early Cretaceous marine sequences that have been cored on the North West Shelf are generally of moderate quality, compared to the high quality source rocks of the northern North Sea, but it should be noted that the cores are from wells on structural highs. The 'hot shales' are not very organic-rich in the northern Dampier Sub-basin and are not yet within the oil window, however seismic data show a possible reduction in velocity to the southwest in the Kendrew Terrace, suggesting that further south in the basin the shales may be within the oil window and may also be richer in organic content. In this case, they may be productive source rocks, analogous to the main source rock of the North Sea.

Controls on Late Jurassic, subtle sand distribution in the Tampen Spur area, Northern North Sea

1999 ◽  
Vol 5 (1) ◽  
pp. 827-838 ◽  
Author(s):  
N. H. DAWERS ◽  
A. M. BERGE ◽  
K.-O. HÄGER ◽  
C. PUIGDEFABREGAS ◽  
J. R. UNDERHILL
Keyword(s):  
North Sea ◽  
Late Jurassic ◽  
Northern North Sea

Character and distribution of hybrid sediment gravity flow deposits from the outer Forties Fan, Palaeocene Central North Sea, UKCS

2009 ◽  
Vol 26 (10) ◽  
pp. 1919-1939 ◽  
Author(s):  
Christopher Davis ◽  
Peter Haughton ◽  
William McCaffrey ◽  
Erik Scott ◽  
Nicholas Hogg ◽  
...  
Keyword(s):  
North Sea ◽  
Gravity Flow ◽  
Sediment Gravity Flow ◽  
Central North Sea
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