Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea
ABSTRACT The seismic imaging of salt diapirs in the Nordkapp Basin gave rise to considerable problems in defining their shape and volume. Independent information was added by integrating the interpretation with high resolution gravity and magnetic data. We developed a novel, iterative workflow, sepa...
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crwiley:10.1111/1365-2478.12101 2024-09-15T17:57:59+00:00 Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea Stadtler, Christopher Fichler, Christine Hokstad, Ketil Myrlund, Eva Andrea Wienecke, Susann Fotland, Bente 2014 http://dx.doi.org/10.1111/1365-2478.12101 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12101 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12101 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geophysical Prospecting volume 62, issue 3, page 615-630 ISSN 0016-8025 1365-2478 journal-article 2014 crwiley https://doi.org/10.1111/1365-2478.12101 2024-08-27T04:30:47Z ABSTRACT The seismic imaging of salt diapirs in the Nordkapp Basin gave rise to considerable problems in defining their shape and volume. Independent information was added by integrating the interpretation with high resolution gravity and magnetic data. We developed a novel, iterative workflow, separated into sub‐categories: sediments, salt structures, basement and Moho. Distinctions between the sources of the anomalies from different depths was achieved by utilizing the different decay characteristics of gravity, gravity gradiometry and high resolution magnetic anomalies. The workflow was applied to the southern part of the Nordkapp Basin. It started with the sedimentary model derived from seismics, populated with measured densities and magnetic susceptibilities and a starting model for the base salt. The residual after the removal of this model was interpreted in terms of a crustal model, including flexural isostatic calculations for the Moho with the sedimentary load. The residual after the removal of crustal and early sedimentary model was used to tune the salt model. As these major and minor modelling steps depend on each other, an iterative process was applied to stepwise improve the density and magnetic susceptibility model. The first vertical gradient of gravity and the magnetic field were found to give most information about the cap rock of the diapirs. The improvement in salt imaging, integrated with results from controlled‐source electromagnetic and magneto‐telluric modelling is shown for the salt diapir Uranus, where a well, terminated in the salt, constrains the minimum of the depth to base salt. Article in Journal/Newspaper Barents Sea Nordkapp Nordkapp Basin Wiley Online Library Geophysical Prospecting 62 3 615 630 |
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English |
description |
ABSTRACT The seismic imaging of salt diapirs in the Nordkapp Basin gave rise to considerable problems in defining their shape and volume. Independent information was added by integrating the interpretation with high resolution gravity and magnetic data. We developed a novel, iterative workflow, separated into sub‐categories: sediments, salt structures, basement and Moho. Distinctions between the sources of the anomalies from different depths was achieved by utilizing the different decay characteristics of gravity, gravity gradiometry and high resolution magnetic anomalies. The workflow was applied to the southern part of the Nordkapp Basin. It started with the sedimentary model derived from seismics, populated with measured densities and magnetic susceptibilities and a starting model for the base salt. The residual after the removal of this model was interpreted in terms of a crustal model, including flexural isostatic calculations for the Moho with the sedimentary load. The residual after the removal of crustal and early sedimentary model was used to tune the salt model. As these major and minor modelling steps depend on each other, an iterative process was applied to stepwise improve the density and magnetic susceptibility model. The first vertical gradient of gravity and the magnetic field were found to give most information about the cap rock of the diapirs. The improvement in salt imaging, integrated with results from controlled‐source electromagnetic and magneto‐telluric modelling is shown for the salt diapir Uranus, where a well, terminated in the salt, constrains the minimum of the depth to base salt. |
format |
Article in Journal/Newspaper |
author |
Stadtler, Christopher Fichler, Christine Hokstad, Ketil Myrlund, Eva Andrea Wienecke, Susann Fotland, Bente |
spellingShingle |
Stadtler, Christopher Fichler, Christine Hokstad, Ketil Myrlund, Eva Andrea Wienecke, Susann Fotland, Bente Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
author_facet |
Stadtler, Christopher Fichler, Christine Hokstad, Ketil Myrlund, Eva Andrea Wienecke, Susann Fotland, Bente |
author_sort |
Stadtler, Christopher |
title |
Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
title_short |
Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
title_full |
Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
title_fullStr |
Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
title_full_unstemmed |
Improved salt imaging in a basin context by high resolution potential field data: Nordkapp Basin, Barents Sea |
title_sort |
improved salt imaging in a basin context by high resolution potential field data: nordkapp basin, barents sea |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/1365-2478.12101 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2478.12101 https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12101 |
genre |
Barents Sea Nordkapp Nordkapp Basin |
genre_facet |
Barents Sea Nordkapp Nordkapp Basin |
op_source |
Geophysical Prospecting volume 62, issue 3, page 615-630 ISSN 0016-8025 1365-2478 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2478.12101 |
container_title |
Geophysical Prospecting |
container_volume |
62 |
container_issue |
3 |
container_start_page |
615 |
op_container_end_page |
630 |
_version_ |
1810434194993577984 |