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Regional study of controls on reservoir quality in the Triassic Skagerrak Formation of the Central North Sea

M. Akpokodje, A. Melvin, J. Churchill, S. Burns, J. Morris, S. Kape, M. Wakefield and R. Ameerali
Geological Society, London, Petroleum Geology Conference series, 8, 125-146, 23 June 2017, https://doi.org/10.1144/PGC8.29
M. Akpokodje
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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  • For correspondence: Michael.Akpokodje@shell.com
A. Melvin
2AM Geos Ltd, 46 Culter House Road, Milltimber, Aberdeen AB13 0EN, UK
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J. Churchill
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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S. Burns
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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J. Morris
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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S. Kape
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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M. Wakefield
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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R. Ameerali
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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Abstract

An improved understanding of the controls on reservoir quality is key to ongoing and future exploration of the Central North Sea Triassic play. This paper presents a regional integrated study of 50 000 ft of wireline log data, 10 000 ft of core, 4431 routine core analyses measurements and 377 thin sections from 86 cored wells.

Triassic Skagerrak Formation sandstones represent thin-bedded heterogeneous reservoirs deposited in a dryland fluvial–lacustrine setting. Fluvial-channel facies are typically fine–medium grained and characterized by a low clay content, whilst lake-margin terminal splay facies are finer grained, more argillaceous and micaceous. Lacustrine intervals are mud-dominated. Primary depositional textures retain a primary control on porosity evolution through burial. Optimal reservoir quality occurs in aerially and stratigraphically restricted fluvial-channel tracts on the Drake, Greater Marnock, Puffin and Gannet terraces, and the J-Ridge area. These primary textural and compositional controls are overprinted by mechanical compaction, the development of early overpressure and diagenesis. Anomalously high porosities are retained at depth in fluvial sandstones that have a low degree of compaction and cementation, including chlorite. Forward modelling of reservoir quality using Touchstone™ software has been validated using well UK 30/8-3 where reservoir depths are >16 000 ft TVDSS (true vertical depth subsea).

  • © 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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Regional study of controls on reservoir quality in the Triassic Skagerrak Formation of the Central North Sea

M. Akpokodje, A. Melvin, J. Churchill, S. Burns, J. Morris, S. Kape, M. Wakefield and R. Ameerali
Geological Society, London, Petroleum Geology Conference series, 8, 125-146, 23 June 2017, https://doi.org/10.1144/PGC8.29
M. Akpokodje
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: Michael.Akpokodje@shell.com
A. Melvin
2AM Geos Ltd, 46 Culter House Road, Milltimber, Aberdeen AB13 0EN, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. Churchill
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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S. Burns
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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J. Morris
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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S. Kape
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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M. Wakefield
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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R. Ameerali
1BG Group, 100 Thames Valley Park Drive, Reading, Berkshire RG6 1PT, UK
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Regional study of controls on reservoir quality in the Triassic Skagerrak Formation of the Central North Sea

M. Akpokodje, A. Melvin, J. Churchill, S. Burns, J. Morris, S. Kape, M. Wakefield and R. Ameerali
Geological Society, London, Petroleum Geology Conference series, 8, 125-146, 23 June 2017, https://doi.org/10.1144/PGC8.29
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  • Article
    • Abstract
    • Geological setting
    • Methodology
    • Facies, depositional elements and reservoir quality
    • Detrital mineralogy, grain alteration and reservoir quality
    • Subsurface porosity evolution and reservoir quality
    • Reservoir quality prediction: Touchstone™ prediction at the 30/8-3 well using J-Ridge well data
    • Discussion
    • Conclusions
    • Acknowledgments
    • References
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