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Reservoir quality of fluvial sandstone reservoirs in salt-walled mini-basins: an example from the Seagull field, Central Graben, North Sea, UK

Stricker, Stephan; Jones, Stuart J.; Meadows, Neil; Bowen, Leon

Reservoir quality of fluvial sandstone reservoirs in salt-walled mini-basins: an example from the Seagull field, Central Graben, North Sea, UK Thumbnail


Authors

Stephan Stricker

Neil Meadows

Leon Bowen leon.bowen@durham.ac.uk
Senior Manager (Electron Microscopy)



Abstract

The Triassic fluvial sandstones of the Skagerrak Formation were deposited in a series of salt-walled mini-basins and act as important hydrocarbon reservoirs for several high-pressure, high-temperature (HPHT) fields in the Central Graben, North Sea. The HPHT reservoirs exhibit excellent reservoir quality considering their depth of burial and hence have been of high interest for hydrocarbon exploration. This research uses a multidisciplinary approach to assess the Skagerrak Formation fluvial reservoir quality from the Seagull field incorporating core analysis, petrography, electron microscopy, XRD analysis, fluid inclusion appraisal and burial history modelling. Halokinesis and salt withdrawal at the margin of the salt-walled mini-basin induced early disaggregation bands and fractures at shallow burial and led to increased influx of meteoric water and clay mineral infiltration from overlying sedimentation. The density of disaggregation bands correlates with the occurrence and magnitude of pore-filling authigenic clay minerals, concentrated along the margin of the salt-walled mini-basin. The fluvial channel sandstones of the Skagerrak Formation are subject to strong intra-basinal spatial reservoir quality variations despite diagenesis and low vertical effective stress having played a favourable role in arresting porosity loss.

Journal Article Type Article
Acceptance Date Jan 4, 2018
Online Publication Date Jan 4, 2018
Publication Date Feb 1, 2018
Deposit Date Jan 30, 2018
Publicly Available Date Jan 30, 2018
Journal Petroleum Science
Print ISSN 1672-5107
Electronic ISSN 1995-8226
Publisher KeAi Communications
Peer Reviewed Peer Reviewed
Volume 15
Issue 1
Pages 1-27
DOI https://doi.org/10.1007/s12182-017-0206-x
Public URL https://durham-repository.worktribe.com/output/1335783

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Advance online version © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.






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