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The edges of the wedges: a systematic approach to trap definition and risking for stratigraphic, combination and sub-unconformity traps

Eleanor J. Stirling, Edith M. G. Fugelli and Mark Thompson
Geological Society, London, Petroleum Geology Conference series, 8, 273-286, 3 February 2017, https://doi.org/10.1144/PGC8.19
Eleanor J. Stirling
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
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  • For correspondence: eleanor.stirling@uk.bp.com
Edith M. G. Fugelli
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
2Present address: Olav Nilssongst 47, 4009 Stavanger, Norway
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Mark Thompson
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
3Present address: Lurch Oil Consultancy Ltd, 14 Priory Road, Chalfont St. Peter, UK
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Abstract

In recent years, stratigraphic and combination traps such as Buzzard (UK North Sea) and Jubilee (Ghana) have attracted much industry attention. Such trap types are generally considered higher risk than structural traps, and understanding them represents a challenge for explorers, as numerous less successful (often amplitude-driven) attempts have demonstrated. Owing to their perceived high risk, stratigraphic traps are often drilled late in a basin's exploration history; however, we assert that consideration of stratigraphic traps should be part of any frontier exploration programme because they occur in all basin types and depositional settings, and allow new plays to be opened up. Additionally, stratigraphic, combination and sub-unconformity traps offer the chance to rejuvenate exploration in mature basins, as recent discoveries like the Edvard Grieg Field (Norwegian North Sea) have shown.

Focusing on clastic systems, and using a combination of seismic examples and models, we present two aspects of stratigraphic trap exploration: (1) the regional and local factors that favour the development of stratigraphic trap edges; and (2) a systematic method for defining and risking the trap edges, avoiding the common problem of over-risking. These two methods, used together and applied consistently, allow explorers to focus on the right area of a basin and to risk stratigraphic traps appropriately, for a fair comparison with structural traps.

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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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The edges of the wedges: a systematic approach to trap definition and risking for stratigraphic, combination and sub-unconformity traps

Eleanor J. Stirling, Edith M. G. Fugelli and Mark Thompson
Geological Society, London, Petroleum Geology Conference series, 8, 273-286, 3 February 2017, https://doi.org/10.1144/PGC8.19
Eleanor J. Stirling
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: eleanor.stirling@uk.bp.com
Edith M. G. Fugelli
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
2Present address: Olav Nilssongst 47, 4009 Stavanger, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Mark Thompson
1BP Exploration Operating Company Ltd, 8 Novinsky Boulevard, Moscow, Russian Federation
3Present address: Lurch Oil Consultancy Ltd, 14 Priory Road, Chalfont St. Peter, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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The edges of the wedges: a systematic approach to trap definition and risking for stratigraphic, combination and sub-unconformity traps

Eleanor J. Stirling, Edith M. G. Fugelli and Mark Thompson
Geological Society, London, Petroleum Geology Conference series, 8, 273-286, 3 February 2017, https://doi.org/10.1144/PGC8.19
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  • Article
    • Abstract
    • Definitions
    • Predicting missing (undiscovered) stratigraphic or subtle fields
    • Regional setting and megasequence framework
    • Risking stratigraphic traps
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