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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Resolution
Sequence Stratigraphy
to Northwest Hutton Field, Northern North Sea: Implications for Management
of a Mature Brent Group Field
1Manuscript received November 18, 1996; revised manuscript
received July 22, 1997; final acceptance February 25, 1998.
2Stratigraphy Research Group, University of Liverpool, Liverpool
L69 3BX, United Kingdom.
3Stratigraphy Research Group, University of Liverpool, Liverpool
L69 3BX, United Kingdom. Present address: Saga Petroleum ASA, Kjorboveien
16, P.O. Box 490, 1301 Sandvika, Norway.
4Amerada Hess Ltd., 33 Grosvenor Place, London SW1X 7NY,
United Kingdom.
We would like to acknowledge the past and present Northwest Hutton
partners, Amoco (U.K.) Exploration Company Ltd., Amerada Hess Ltd., Mobil
North Sea Ltd., Petrobras (UK), and Cieco for permission to publish this
paper. Amerada Hess and Cieco are thanked for their financial and logistical
support of the study. The views expressed herein are ours. John Howell
is thanked for his help with the ichnology and Brent Cheshire for supporting
the project from inception to completion. During manuscript review, discussions
with NWH team members Richard Benmore and Toby Read clarified several points
on the Etive. AAPG reviewers G. Bertram, C. B. Boutte, A. D. Miall, and
former Elected Editor Kevin Biddle, are thanked for improving the paper
through their comments.
ABSTRACT
The Middle Jurassic Brent Group reservoirs in Northwest Hutton comprise
shallow-marine, marginal-marine, and coastal-plain reservoir sandstones
of both channelized and sheet geometries. The connectivity and production
characteristics of these sandstones can be predicted through the application
of high-resolution
sequence stratigraphic correlation techniques. The Broom
Formation overlies a basal Brent sequence boundary and is a lowstand to
transgressive systems tract tidal-estuarine complex. The overlying Rannoch
Formation comprises shoreface sands that represent a highstand systems
tract. The overlying Etive Formation is a multilayer fluvial to estuarine
channelized system of near fieldwide development interpreted as incised
valley fills. The superjacent Ness Formation is genetically related to
the Etive and is the main oil-bearing interval over much of the field.
The Lower Ness comprises mouth-bar parasequences and is interpreted to
be a transgressive systems tract to the Etive lowstand. The Upper Ness
is a nonmarine delta plain succession, interpreted as a highstand systems
tract. Upper Ness channel sands typically correlate between several wells
and are oriented west-east. An interval of widespread, stacked channels
indicates a change in drainage orientation and is related to a high-frequency
relative sea level fall. The uppermost reservoir unit is the Tarbert Formation,
related to a further major sequence boundary. Original repeat formation
tester data support a stratigraphically well- connected reservoir model.
Compartmentalization exists and is due to stratigraphic layering (laterally
persistent mudstones creating low
vertical
permeability) and variable dimensions
of channels and valley fills.
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