Skip to Main Content
Book Chapter

Sedimentological evolution of Sele Formation deep-marine depositional systems of the Central North Sea

By
James Eldrett
James Eldrett
1
Shell International Exploration and Production Inc., Shell Technology Center Houston, 3333 Highway 6 South, Houston, TX 77082, USA
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Efthymios Tripsanas
Efthymios Tripsanas
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Christopher Davis
Christopher Davis
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Tom McKie
Tom McKie
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Manuel Vieira
Manuel Vieira
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Peter Osterloff
Peter Osterloff
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Tom Sandison
Tom Sandison
2
Shell UK Ltd, Altens Farm Road, Nigg, Aberdeen AB12 3FY, UK
Search for other works by this author on:
Published:
January 01, 2015

Abstract

The Paleocene–Eocene-aged Sele Formation is developed across the basinal region of the Central North Sea. The section comprises a number of deep-marine fan systems that expanded and contracted across the basin floor in response to relative sea-level changes on the basin margin and fluctuating sediment yield off the Scottish landmass modulated by climate and hinterland uplift. Persistent sediment entry points to the basin resulted in the development of discrete axial and transverse fan fairways with a geometry dictated by an irregular bathymetry sculpted by differential compaction across Mesozoic faults, halokinesis and antecedent fan systems. A high-resolution biostratigraphic framework has allowed the evolution of fan-dispersal systems in response to these effects to be tracked across the basin within four genetic sequences. The proximal parts of the fans comprised channel complexes of low sinuosity, high lateral offset, and low aggradation. The development of these systems in a bathymetrically confined corridor of the Central Graben (c. 65 km wide), combined with high sediment supply, resulted in the eventual burial of any underlying relief. The behaviour of sand-rich reservoirs in this region is dominated by the permeability contrast between high-quality channel fairways and more heterolithic overbank regions, with the potential for early water breakthrough and aquifer coning in the channel fairways, and unswept volumes in overbank locations. Compartmentalization of compensationally stacked channel bodies occurs locally, with stratigraphic trapping caused by lateral channel pinch-outs, channel-base debrites, mud-rich drapes and abandonment fines. Towards the southern part of Quadrant 22, approximately 150 km down-palaeoflow, the systems became less confined and in this region are dominated by channel–lobe complexes, which continued to interact with an irregular bathymetry controlled by antecedent fans, mass-transport complexes and halokinesis in the form of rising salt diapirs. Reservoirs in this region are inherently stratigraphically compartmentalized by their heterolithic lithology and compensational stacking of lobes, and further complicated by structuration and instability induced by the diapiric or basement structures needed to generate a trapping structure in these settings.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Tertiary Deep-Marine Reservoirs of the North Sea Region

T. McKie
T. McKie
Shell UK Ltd, UK
Search for other works by this author on:
P. T. S. Rose
P. T. S. Rose
Apache North Sea, UK
Search for other works by this author on:
A. J. Hartley
A. J. Hartley
University of Aberdeen, UK
Search for other works by this author on:
D. W. Jones
D. W. Jones
Shell UK Ltd, UK
Search for other works by this author on:
T. L. Armstrong
T. L. Armstrong
Talisman Sinopec Energy UK Ltd, UK
Search for other works by this author on:
Geological Society of London
Volume
403
ISBN electronic:
9781862396791
Publication date:
January 01, 2015

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal