Geophysical imaging of porosity variations in the Danish North Sea chalk
More than 80% of the present-day oil and gas production in the Danish part of the North Sea is extracted from fields with chalk reservoirs of late Cretaceous (Maastrichtian) and early Paleocene (Danian) ages (Fig. 1). Seismic reflection and inversion data play a fundamental role in mapping and chara...
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ftjgeusbullet:oai:geusjournals.org:article/5033 2023-05-15T16:29:11+02:00 Geophysical imaging of porosity variations in the Danish North Sea chalk Abramovitz, Tanni 2008-07-10 application/pdf https://geusbulletin.org/index.php/geusb/article/view/5033 https://doi.org/10.34194/geusb.v15.5033 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/5033/10718 https://geusbulletin.org/index.php/geusb/article/view/5033 doi:10.34194/geusb.v15.5033 GEUS Bulletin; Vol. 15 (2008): Review of Survey activities 2007; 17-20 2597-2154 2597-2162 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Rapid Communication. Peer-reviewed Article. 2008 ftjgeusbullet https://doi.org/10.34194/geusb.v15.5033 2022-03-15T17:22:23Z More than 80% of the present-day oil and gas production in the Danish part of the North Sea is extracted from fields with chalk reservoirs of late Cretaceous (Maastrichtian) and early Paleocene (Danian) ages (Fig. 1). Seismic reflection and inversion data play a fundamental role in mapping and characterisation of intra-chalk structures and reservoir properties of the Chalk Group in the North Sea. The aim of seismic inversion is to transform seismic reflection data into quantitative rock properties such as acoustic impedance (AI) that provides information on reservoir properties enabling identification of porosity anomalies that may constitute potential reservoir compartments. Petrophysical analyses of well log data have shown a relationship between AI and porosity. Hence, AI variations can be transformed into porosity variations and used to support detailed interpretations of porous chalk units of possible reservoir quality. This paper presents an example of how the chalk team at the Geological Survey of Denmark and Greenland (GEUS) integrates geological, geophysical and petrophysical information, such as core data, well log data, seismic 3-D reflection and AI data, when assessing the hydrocarbon prospectivity of chalk fields. Article in Journal/Newspaper Greenland GEUS Bulletin (Geological Survey of Denmark and Greenland) Greenland Geological Survey of Denmark and Greenland (GEUS) Bulletin 15 17 20 |
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GEUS Bulletin (Geological Survey of Denmark and Greenland) |
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English |
description |
More than 80% of the present-day oil and gas production in the Danish part of the North Sea is extracted from fields with chalk reservoirs of late Cretaceous (Maastrichtian) and early Paleocene (Danian) ages (Fig. 1). Seismic reflection and inversion data play a fundamental role in mapping and characterisation of intra-chalk structures and reservoir properties of the Chalk Group in the North Sea. The aim of seismic inversion is to transform seismic reflection data into quantitative rock properties such as acoustic impedance (AI) that provides information on reservoir properties enabling identification of porosity anomalies that may constitute potential reservoir compartments. Petrophysical analyses of well log data have shown a relationship between AI and porosity. Hence, AI variations can be transformed into porosity variations and used to support detailed interpretations of porous chalk units of possible reservoir quality. This paper presents an example of how the chalk team at the Geological Survey of Denmark and Greenland (GEUS) integrates geological, geophysical and petrophysical information, such as core data, well log data, seismic 3-D reflection and AI data, when assessing the hydrocarbon prospectivity of chalk fields. |
format |
Article in Journal/Newspaper |
author |
Abramovitz, Tanni |
spellingShingle |
Abramovitz, Tanni Geophysical imaging of porosity variations in the Danish North Sea chalk |
author_facet |
Abramovitz, Tanni |
author_sort |
Abramovitz, Tanni |
title |
Geophysical imaging of porosity variations in the Danish North Sea chalk |
title_short |
Geophysical imaging of porosity variations in the Danish North Sea chalk |
title_full |
Geophysical imaging of porosity variations in the Danish North Sea chalk |
title_fullStr |
Geophysical imaging of porosity variations in the Danish North Sea chalk |
title_full_unstemmed |
Geophysical imaging of porosity variations in the Danish North Sea chalk |
title_sort |
geophysical imaging of porosity variations in the danish north sea chalk |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2008 |
url |
https://geusbulletin.org/index.php/geusb/article/view/5033 https://doi.org/10.34194/geusb.v15.5033 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
GEUS Bulletin; Vol. 15 (2008): Review of Survey activities 2007; 17-20 2597-2154 2597-2162 |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/5033/10718 https://geusbulletin.org/index.php/geusb/article/view/5033 doi:10.34194/geusb.v15.5033 |
op_doi |
https://doi.org/10.34194/geusb.v15.5033 |
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Geological Survey of Denmark and Greenland (GEUS) Bulletin |
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15 |
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17 |
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20 |
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1766018880748126208 |