Skip to Main Content
Book Chapter

Characterization of Lateral Heterogeneities in an Exceptionally Exposed Turbidite Sand Body, Grès d’Annot (Eocene-Oligocene), SE France

By
Simon A. Lomas
Simon A. Lomas
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Bryan T. Cronin
Bryan T. Cronin
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Adrian J. Hartley
Adrian J. Hartley
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Davide Duranti
Davide Duranti
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Andrew Hurst
Andrew Hurst
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Mackay Emma
Mackay Emma
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Stewart J. Clark
Stewart J. Clark
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Barbara Palumbo
Barbara Palumbo
Department of Geology and Petroleum Geology University of Aberdeen King’s College Aberdeen AB24 3UE UK
Search for other works by this author on:
Sean Kelly
Sean Kelly
Shell UK Exploration and Production Altens Farm Road Aberdeen AB12 3FY UK
Search for other works by this author on:
Published:
December 01, 2000

Abstract

The Trois Evêchés outcrop of the Grès d’Annot (Annot Sandstones: Eocene-Oligocene, SE France) represents one of the world’s best exposed examples of a confined sandy turbidite system and has exceptional exposures of ‘channelised lobe’ or ‘amalgamated sheet’ sand-bodies. The sand bodies have simple tabular external geometries (lobe/ sheet-like) but show complex internal organisation characterised by a combination of scouring, bypass and aggradational features (channel-like). We have targeted the best exposed, most laterally continuous sand body (termed the FB unit) for very detailed studies at a scale appropriate to reservoir modeling. The result is a west northwest-east southeast panel 35 m thick, 1700 m long parallel to palaeocurrent direction (‘downdip’), within which all zones are characterised in terms of key properties (grain-size, sorting, cementation, and primary and secondary structures) and all key surfaces are absolutely correlated (i.e., directly physically traced). This unique database allows quantification of lateral facies relationships and deterministic definition of both architectural components and stratal hierarchy. The FB body is a thick, tabular, high-net:gross unit having a simple tabular external geometry but a complex internal structure. Key observations are that: (1) the system shows considerable lateral variability; (2) the well-defined base of the FB sand body is a different genetic surface in different places; (3) a few beds and surfaces are laterally persistent but, because of erosion, many are not traceable for more than 100-200 m; (4) packages within the sand body are erosive based and vary laterally in thickness, having an element of compensation between successive packages; (5) the erosive-based packages show a back-stepping arrangement of successive points of deepest erosion (i.e., migrating towards the east-southeast, uppalaeocurrent). The FB sand body appears relatively uniform at a distance but in detail contains numerous heterogeneities at variable scales which would have a considerable impact on fluid flow through an apparently homogeneous sandstone.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GCSSEPM

Deep-Water Reservoirs of the World

Paul Weimer
Paul Weimer
Houston, Texas
Search for other works by this author on:
SEPM Society for Sedimentary Geology
Volume
20
ISBN electronic:
978-0-9836097-0-4
Publication date:
December 01, 2000

GeoRef

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

This Feature Is Available To Subscribers Only

Sign In or Create an Account

This PDF is available to Subscribers Only

View Article Abstract & Purchase Options

For full access to this pdf, sign in to an existing account, or purchase an annual subscription.

Subscribe Now