Skip to Main Content
Book Chapter

The character and origin of thick base-of-slope sandstone units of the Peïra Cava outlier, SE France

By
Simon E. Lee
Simon E. Lee
1
Department of Earth Sciences, University of Bristol
Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK
Simon.Lee@bristol.ac.uk
Search for other works by this author on:
;
L. A. Amy
L. A. Amy
1
Department of Earth Sciences, University of Bristol
Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK
Simon.Lee@bristol.ac.uk
2
School of Earth Sciences, University of Leeds
Leeds LS2 9JT, UK
Search for other works by this author on:
;
P. J. Talling
P. J. Talling
1
Department of Earth Sciences, University of Bristol
Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK
Simon.Lee@bristol.ac.uk
Search for other works by this author on:
Published:
January 01, 2004

Abstract

Many hydrocarbon reservoirs occur within confined turbidite systems in which the depositional pattern of turbidity currents has been strongly influenced by basin-floor topography. In certain settings basin-floor topography may cause the development of anomalously thick (tens of metres) sandstones that are potentially excellent reservoir units. Southern exposures of the Peïra Cava outlier (Eocene-Oligocene; Annot Sandstones) provide well-exposed outcrops of such decametre-thick sandstone bodies. These units are located close to basin margins and downstream from an inferred topographic break-in-slope. Several base-of-slope sandstone bodies are examined that illustrate a common sedimentary theme of a complex basal unit, comprising laterally pinching or inter-fingering debrite and turbidite, abruptly overlain by a single, thick normally graded turbidite deposit. One of these sandstone bodies pinches out laterally over less than several hundred metres and sits within a deep (>20 m) ‘spoon shaped’ erosional scour. The scour is similar to morphological features observed in modern base-of-slope settings recently imaged using high-resolution submarine bathymetric surveys. Several different process interpretations may explain the occurrence of such sandstone bodies including remobilization of newly deposited sediment off basinmargins and enhanced deposition due to flow across a break-in-slope. A submarine channel interpretation is not consistent with the field observations. However, these units do share a number of similar features to channels that could lead to the misinterpretation of reservoir geometry.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems

P. Joseph
P. Joseph
Institut Français du Pétrole, France
Search for other works by this author on:
;
S. A. Lomas
S. A. Lomas
Baker Atlas Geoscience, UK
Search for other works by this author on:
Geological Society of London
Volume
221
ISBN electronic:
9781862394698
Publication date:
January 01, 2004

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal