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

Phil Rose, Grant Byerley, Owen Vaughan, John Cater, Brice R. Rea, Matteo Spagnolo and Stuart Archer
Geological Society, London, Petroleum Geology Conference series, 8, 485-505, 23 March 2017, https://doi.org/10.1144/PGC8.16
Phil Rose
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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Grant Byerley
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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Owen Vaughan
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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John Cater
2RPS Ichron, Northwich, Cheshire CW9 7TL, UK
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Brice R. Rea
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Matteo Spagnolo
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Stuart Archer
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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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.

  • © 2018 Petroleum Geology Conferences Ltd. Published by the Geological Society, London. All rights reserved
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Geological Society, London, Petroleum Geology Conference 				series: 8 (1)
Geological Society, London, Petroleum Geology Conference series
Volume 8
2018
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Aviat: a Lower Pleistocene shallow gas hazard developed as a fuel gas supply for the Forties Field

Phil Rose, Grant Byerley, Owen Vaughan, John Cater, Brice R. Rea, Matteo Spagnolo and Stuart Archer
Geological Society, London, Petroleum Geology Conference series, 8, 485-505, 23 March 2017, https://doi.org/10.1144/PGC8.16
Phil Rose
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: phil.rose@apachecorp.com
Grant Byerley
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
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Owen Vaughan
1Apache North Sea Ltd, Caledonia House, Prime Four Business Park, Kingswells, Aberdeen AB158PU, UK
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John Cater
2RPS Ichron, Northwich, Cheshire CW9 7TL, UK
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Brice R. Rea
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Matteo Spagnolo
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Stuart Archer
3School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, UK
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Aviat: a Lower Pleistocene shallow gas hazard developed as a fuel gas supply for the Forties Field

Phil Rose, Grant Byerley, Owen Vaughan, John Cater, Brice R. Rea, Matteo Spagnolo and Stuart Archer
Geological Society, London, Petroleum Geology Conference series, 8, 485-505, 23 March 2017, https://doi.org/10.1144/PGC8.16
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  • Article
    • Abstract
    • Exploration and development history
    • Aviat geophysical and geological database
    • Aviat geological context
    • The Aviat reservoir
    • Reservoir characterization
    • Hydrocarbon resource base and development decision
    • Summary and conclusions
    • Acknowledgments
    • Appendix A: Field summary parameters
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