Rock physics modelling based on depositional and burial history of Barents Sea sandstones
ABSTRACT Understanding how physical properties and seismic signatures of present day rocks are related to ancient geological processes is important for enhanced reservoir characterization. In this paper, we have studied this relationship for the Kobbe Formation sandstone in the Barents Sea. These ro...
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crwiley:10.1111/1365-2478.12683 2023-12-03T10:20:07+01:00 Rock physics modelling based on depositional and burial history of Barents Sea sandstones Bredesen, Kenneth Avseth, Per Johansen, Tor Arne Olstad, Richard 2018 http://dx.doi.org/10.1111/1365-2478.12683 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12683 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12683 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2478.12683 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geophysical Prospecting volume 67, issue 4, page 825-842 ISSN 0016-8025 1365-2478 Geochemistry and Petrology Geophysics journal-article 2018 crwiley https://doi.org/10.1111/1365-2478.12683 2023-11-09T14:08:54Z ABSTRACT Understanding how physical properties and seismic signatures of present day rocks are related to ancient geological processes is important for enhanced reservoir characterization. In this paper, we have studied this relationship for the Kobbe Formation sandstone in the Barents Sea. These rocks show anomalous low shear velocities and high V P / V S ratios, which does not agree well with conventional rock physics models for moderately to well consolidated sandstones. These sandstones have been buried relatively deeply and subsequently uplifted 1–2 km. We compared well log data of the Kobbe sandstone with velocity–depth trends modelled by integrating basin modelling principles and rock physics. We found that more accurate velocity predictions were obtained when first honouring mechanical and chemical compaction during burial, followed by generation of micro‐cracks during uplift. We suspect that these micro‐cracks are formed as overburden is eroded, leading to changes in the subsurface stress‐field. Moreover, the Kobbe Formation is typically heterogeneous and characterized by structural clays and mica that can reduce the rigidity of grain contacts. By accounting for depositional and burial history, our velocity predictions become more consistent with geophysical observables. Our approach yields more robust velocity predictions, which are important in prospect risking and net erosion estimates. Article in Journal/Newspaper Barents Sea Wiley Online Library (via Crossref) Barents Sea Geophysical Prospecting 67 4 825 842 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Geochemistry and Petrology Geophysics |
spellingShingle |
Geochemistry and Petrology Geophysics Bredesen, Kenneth Avseth, Per Johansen, Tor Arne Olstad, Richard Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
topic_facet |
Geochemistry and Petrology Geophysics |
description |
ABSTRACT Understanding how physical properties and seismic signatures of present day rocks are related to ancient geological processes is important for enhanced reservoir characterization. In this paper, we have studied this relationship for the Kobbe Formation sandstone in the Barents Sea. These rocks show anomalous low shear velocities and high V P / V S ratios, which does not agree well with conventional rock physics models for moderately to well consolidated sandstones. These sandstones have been buried relatively deeply and subsequently uplifted 1–2 km. We compared well log data of the Kobbe sandstone with velocity–depth trends modelled by integrating basin modelling principles and rock physics. We found that more accurate velocity predictions were obtained when first honouring mechanical and chemical compaction during burial, followed by generation of micro‐cracks during uplift. We suspect that these micro‐cracks are formed as overburden is eroded, leading to changes in the subsurface stress‐field. Moreover, the Kobbe Formation is typically heterogeneous and characterized by structural clays and mica that can reduce the rigidity of grain contacts. By accounting for depositional and burial history, our velocity predictions become more consistent with geophysical observables. Our approach yields more robust velocity predictions, which are important in prospect risking and net erosion estimates. |
format |
Article in Journal/Newspaper |
author |
Bredesen, Kenneth Avseth, Per Johansen, Tor Arne Olstad, Richard |
author_facet |
Bredesen, Kenneth Avseth, Per Johansen, Tor Arne Olstad, Richard |
author_sort |
Bredesen, Kenneth |
title |
Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
title_short |
Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
title_full |
Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
title_fullStr |
Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
title_full_unstemmed |
Rock physics modelling based on depositional and burial history of Barents Sea sandstones |
title_sort |
rock physics modelling based on depositional and burial history of barents sea sandstones |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/1365-2478.12683 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12683 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12683 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1365-2478.12683 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
Geophysical Prospecting volume 67, issue 4, page 825-842 ISSN 0016-8025 1365-2478 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2478.12683 |
container_title |
Geophysical Prospecting |
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67 |
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4 |
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825 |
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842 |
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1784267531290148864 |