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

By
K. A. Wright
K. A. Wright
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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R. Nice
R. Nice
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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M. Tazzi
M. Tazzi
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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K. Purnell
K. Purnell
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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V. Penasse
V. Penasse
DONG Energy E&P UK Ltd, 5 Howick Place, London SW1P 1WG, UK
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Published:
January 01, 2018

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.

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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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