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Spectral decomposition: an aid in characterizing field architectures of the Laggan and Tormore fields, Faroe–Shetland Basin

K. A. Wright, R. Nice, M. Tazzi, K. Purnell and V. Penasse
Geological Society, London, Petroleum Geology Conference series, 8, 525-535, 17 March 2017, https://doi.org/10.1144/PGC8.10
K. A. Wright
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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  • For correspondence: kirwr@dongenergy.co.uk
R. Nice
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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M. Tazzi
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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K. Purnell
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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V. Penasse
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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Abstract

Spectral decomposition analyses seismic reflectivity data in the frequency domain, providing images of the subsurface that complement conventional seismic interpretation. It is a highly visual tool that allows additional value to be extracted from seismic data, to aid in the identification of geological information and to be used in conjunction with more traditional methods such as amplitude extraction and attribute analysis. The methods of spectral decomposition chosen utilized a top reservoir seismic reflection surface, with the selected dominant frequency volumes coloured and recombined in a spatial context to produce various red–green–blue (RGB) blends. Application of spectral decomposition to the Laggan and Tormore fields revealed the varied distribution of turbiditic sands, as well as extensive east–west faults that have previously been inferred from seismic reflection data. These enhanced images of the reservoir provide a more detailed interpretation of the field architecture and have been captured in DONG E&P UK Ltd's own fault and reservoir models, leading to a greater understanding of potential field development outcomes and future well placement decisions. Attempts to distinguish hydrocarbon effects using spectral decomposition proved difficult, although interesting frequency variations around a known gas–oil contact (GOC) were noted.

  • © DONG E&P UK Ltd, 2018. 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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Spectral decomposition: an aid in characterizing field architectures of the Laggan and Tormore fields, Faroe–Shetland Basin

K. A. Wright, R. Nice, M. Tazzi, K. Purnell and V. Penasse
Geological Society, London, Petroleum Geology Conference series, 8, 525-535, 17 March 2017, https://doi.org/10.1144/PGC8.10
K. A. Wright
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: kirwr@dongenergy.co.uk
R. Nice
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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M. Tazzi
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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K. Purnell
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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V. Penasse
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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Spectral decomposition: an aid in characterizing field architectures of the Laggan and Tormore fields, Faroe–Shetland Basin

K. A. Wright, R. Nice, M. Tazzi, K. Purnell and V. Penasse
Geological Society, London, Petroleum Geology Conference series, 8, 525-535, 17 March 2017, https://doi.org/10.1144/PGC8.10
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