Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf
ABSTRACT We investigated the seismic attenuation of compressional (P‐) and converted shear (S‐) waves through stacked basalt flows using short‐offset vertical seismic profile (VSP) recordings from the Brugdan (6104/21–1) and William (6005/13–1A) wells in the Faroe‐Shetland Trough. The seismic qualit...
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crwiley:10.1111/1365-2478.12087 2024-06-02T08:06:26+00:00 Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf Schuler, J. Christie, P.A.F. White, R.S. 2013 http://dx.doi.org/10.1111/1365-2478.12087 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12087 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12087 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geophysical Prospecting volume 62, issue 2, page 315-332 ISSN 0016-8025 1365-2478 journal-article 2013 crwiley https://doi.org/10.1111/1365-2478.12087 2024-05-03T11:31:04Z ABSTRACT We investigated the seismic attenuation of compressional (P‐) and converted shear (S‐) waves through stacked basalt flows using short‐offset vertical seismic profile (VSP) recordings from the Brugdan (6104/21–1) and William (6005/13–1A) wells in the Faroe‐Shetland Trough. The seismic quality factors ( Q ) were evaluated with the classical spectral ratio method and a root‐mean‐square time‐domain amplitude technique. We found the latter method showed more robust results when analysing signals within the basalt sequence. For the Brugdan well we calculated effective Q estimates of 22–26 and 13–17 for P‐ and S‐waves, respectively, and 25–33 for P‐waves in the William well. An effective Q S / Q P ratio of 0.50–0.77 was found from a depth interval in the basalt flow sequence where we expect fully saturated rocks. P‐wave quality factor estimates are consistent with results from other VSP experiments in the North Atlantic Margin, while the S‐wave quality factor is one of the first estimates from a stacked basalt formation using VSP data. Synthetic modelling demonstrates that seismic attenuation for P‐ and S‐waves in the stacked basalt flow sequence is mainly caused by one‐dimensional scattering, while intrinsic absorption is small. Article in Journal/Newspaper Faroes North Atlantic Wiley Online Library Geophysical Prospecting 62 2 315 332 |
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English |
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ABSTRACT We investigated the seismic attenuation of compressional (P‐) and converted shear (S‐) waves through stacked basalt flows using short‐offset vertical seismic profile (VSP) recordings from the Brugdan (6104/21–1) and William (6005/13–1A) wells in the Faroe‐Shetland Trough. The seismic quality factors ( Q ) were evaluated with the classical spectral ratio method and a root‐mean‐square time‐domain amplitude technique. We found the latter method showed more robust results when analysing signals within the basalt sequence. For the Brugdan well we calculated effective Q estimates of 22–26 and 13–17 for P‐ and S‐waves, respectively, and 25–33 for P‐waves in the William well. An effective Q S / Q P ratio of 0.50–0.77 was found from a depth interval in the basalt flow sequence where we expect fully saturated rocks. P‐wave quality factor estimates are consistent with results from other VSP experiments in the North Atlantic Margin, while the S‐wave quality factor is one of the first estimates from a stacked basalt formation using VSP data. Synthetic modelling demonstrates that seismic attenuation for P‐ and S‐waves in the stacked basalt flow sequence is mainly caused by one‐dimensional scattering, while intrinsic absorption is small. |
format |
Article in Journal/Newspaper |
author |
Schuler, J. Christie, P.A.F. White, R.S. |
spellingShingle |
Schuler, J. Christie, P.A.F. White, R.S. Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
author_facet |
Schuler, J. Christie, P.A.F. White, R.S. |
author_sort |
Schuler, J. |
title |
Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
title_short |
Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
title_full |
Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
title_fullStr |
Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
title_full_unstemmed |
Borehole study of compressional and shear attenuation of basalt flows penetrated by the Brugdan and William wells on the Faroes shelf |
title_sort |
borehole study of compressional and shear attenuation of basalt flows penetrated by the brugdan and william wells on the faroes shelf |
publisher |
Wiley |
publishDate |
2013 |
url |
http://dx.doi.org/10.1111/1365-2478.12087 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12087 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12087 |
genre |
Faroes North Atlantic |
genre_facet |
Faroes North Atlantic |
op_source |
Geophysical Prospecting volume 62, issue 2, page 315-332 ISSN 0016-8025 1365-2478 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2478.12087 |
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Geophysical Prospecting |
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62 |
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315 |
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332 |
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