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Aviat: a Lower Pleistocene shallow gas hazard developed as a fuel gas supply for the Forties Field

By
Phil Rose
Phil Rose
1
Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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Grant Byerley
Grant Byerley
1
Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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Owen Vaughan
Owen Vaughan
1
Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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John Cater
John Cater
2
RPS Ichron, Northwich, Cheshire CW9 7TL, UK
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Brice R. Rea
Brice R. Rea
3
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Matteo Spagnolo
Matteo Spagnolo
3
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Stuart Archer
Stuart Archer
3
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Published:
January 01, 2018

Abstract

The search for a gas source near to Apache's Forties Field in the North Sea was motivated by the prediction of an ever-increasing fuel gas shortfall as the field oil rate declined. The Central North Sea is well known for a large number of shallow gas hazards in the Pleistocene section that have historically caused blowouts during exploration and development. These gas accumulations typically show up as small bright anomalies on seismic data. In 2009, a large gas anomaly was identified to the east of Forties, and the Aviat Field was discovered in 2010 when exploration well 22/7-5 was drilled.

The Aviat Field reservoir is interpreted to be a subaqueous glacial outwash fan, consisting of silt-grade, rock flour material, deposited in front of a grounded ice sheet in some 400 m of water. Aviat sits on an overcompacted silty mudstone that was deformed by this ice sheet – the Crenulate Marker. The distribution of this horizon implies that the Early Pleistocene ice sheet covered at least the northern half of the UK North Sea.

Although the Aviat reservoir is thin (2–9 m thick), the well tests, pressure profiles and geophysical response demonstrate that the reservoir is well connected, extensive (over 35 km2) with high deliverability (up to 18 MMscfd achieved). Aviat was sanctioned in 2014 for development as a fuel gas supply for the Forties Field, with first gas achieved in July 2016.

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Contents

Geological Society, London, Special Publications

Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference

M. Bowman
M. Bowman
University of Manchester, UK
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B. Levell
B. Levell
University of Oxford, UK
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The Geological Society of London
Volume
8
ISBN electronic:
9781786203151
Publication date:
January 01, 2018

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