Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin

Tobias Schmiedel, Sigurd Kjoberg, Sverre Planke, Craig Magee, Olivier Galland, Nick Schofield, Christopher A.-L. Jackson, Dougal A Jerram

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Abstract

The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models of host-rock deformation are investigated using high-quality 3D seismic and industry well data in the western Møre Basin offshore mid-Norway. The models include synemplacement (e.g., elastic bending-related active uplift and volume reduction of metamorphic aureoles) and postemplacement (e.g., differential compaction) mechanisms. We use the seismic interpretations of five horizons in the Cretaceous-Paleogene sequence (Springar, Tang, and Tare Formations) to analyze the host rock deformation induced by the emplacement of the underlying saucer-shaped Tulipan sill. The results show that the sill, emplaced between 55.8 and 54.9 Ma, is responsible for the overlying dome structure observed in the seismic data. Isochron maps of the deformed sediments, as well as deformation of the younger postemplacement sediments, document a good match between the spatial distribution of the dome and the periphery of the sill. The thickness tt of the Tulipan is less than 100 m, whereas the amplitude ff of the overlying dome ranges between 30 and 70 m. Spectral decomposition maps highlight the distribution of fractures in the upper part of the dome. These fractures are observed in between hydrothermal vent complexes in the outer parts of the dome structure. The 3D seismic horizon interpretation and volume rendering visualization of the Tulipan sill reveal fingers and an overall saucer-shaped geometry. We conclude that a combination of different mechanisms of overburden deformation, including (1) elastic bending, (2) shear failure, and (3) differential compaction, is responsible for the synemplacement formation and the postemplacement modification of the observed dome structure in the Tulipan area.
Original languageEnglish
Pages (from-to)SK23-SK38
Number of pages16
JournalInterpretation
Volume5
Issue number3
Early online date3 Apr 2017
DOIs
Publication statusPublished - Aug 2017

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domes
overburden
sill
dome
margins
emplacement
elastic bending
host rock
rocks
horizon
compaction
sediments
Norway
vents
hydrothermal vent
intrusion
Paleogene
sedimentary basin
sediment
visualization

Keywords

  • 3D
  • interpretation
  • volcanics
  • Europe

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Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. / Schmiedel, Tobias; Kjoberg, Sigurd; Planke, Sverre; Magee, Craig; Galland, Olivier ; Schofield, Nick; Jackson, Christopher A.-L.; Jerram, Dougal A.

In: Interpretation, Vol. 5, No. 3, 08.2017, p. SK23-SK38.

Research output: Contribution to journalArticle

Schmiedel, T, Kjoberg, S, Planke, S, Magee, C, Galland, O, Schofield, N, Jackson, CA-L & Jerram, DA 2017, 'Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin', Interpretation, vol. 5, no. 3, pp. SK23-SK38. https://doi.org/10.1190/INT-2016-0155.1
Schmiedel, Tobias ; Kjoberg, Sigurd ; Planke, Sverre ; Magee, Craig ; Galland, Olivier ; Schofield, Nick ; Jackson, Christopher A.-L. ; Jerram, Dougal A. / Mechanisms of overburden deformation associated with the emplacement of the Tulipan sill, mid-Norwegian margin. In: Interpretation. 2017 ; Vol. 5, No. 3. pp. SK23-SK38.
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abstract = "The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models of host-rock deformation are investigated using high-quality 3D seismic and industry well data in the western M{\o}re Basin offshore mid-Norway. The models include synemplacement (e.g., elastic bending-related active uplift and volume reduction of metamorphic aureoles) and postemplacement (e.g., differential compaction) mechanisms. We use the seismic interpretations of five horizons in the Cretaceous-Paleogene sequence (Springar, Tang, and Tare Formations) to analyze the host rock deformation induced by the emplacement of the underlying saucer-shaped Tulipan sill. The results show that the sill, emplaced between 55.8 and 54.9 Ma, is responsible for the overlying dome structure observed in the seismic data. Isochron maps of the deformed sediments, as well as deformation of the younger postemplacement sediments, document a good match between the spatial distribution of the dome and the periphery of the sill. The thickness tt of the Tulipan is less than 100 m, whereas the amplitude ff of the overlying dome ranges between 30 and 70 m. Spectral decomposition maps highlight the distribution of fractures in the upper part of the dome. These fractures are observed in between hydrothermal vent complexes in the outer parts of the dome structure. The 3D seismic horizon interpretation and volume rendering visualization of the Tulipan sill reveal fingers and an overall saucer-shaped geometry. We conclude that a combination of different mechanisms of overburden deformation, including (1) elastic bending, (2) shear failure, and (3) differential compaction, is responsible for the synemplacement formation and the postemplacement modification of the observed dome structure in the Tulipan area.",
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note = "We thank Statoil for providing us with the PL251 (Tulipan) geophysical and geologic reports for well 6302/6-1. Thanks to GeoTerric and Schlumberger (Petrel) for the free academic use of seismic software. We further acknowledge the support by the Faculty of Mathematics and Natural Sciences of the University of Oslo and the MIMES project (grant no. 244155) funded by the Petromaks2 program of the Norwegian Research Council. We thank the editor, S. Holford, and the three reviewers (K. Senger and two anonymous) for their constructive comments. Finally, thanks to F. Guldstrand, {\O}. T. Haug, and A. Souche for the inspiring discussions.",
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AU - Magee, Craig

AU - Galland, Olivier

AU - Schofield, Nick

AU - Jackson, Christopher A.-L.

AU - Jerram, Dougal A

N1 - We thank Statoil for providing us with the PL251 (Tulipan) geophysical and geologic reports for well 6302/6-1. Thanks to GeoTerric and Schlumberger (Petrel) for the free academic use of seismic software. We further acknowledge the support by the Faculty of Mathematics and Natural Sciences of the University of Oslo and the MIMES project (grant no. 244155) funded by the Petromaks2 program of the Norwegian Research Council. We thank the editor, S. Holford, and the three reviewers (K. Senger and two anonymous) for their constructive comments. Finally, thanks to F. Guldstrand, Ø. T. Haug, and A. Souche for the inspiring discussions.

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N2 - The emplacement of igneous intrusions into sedimentary basins mechanically deforms the host rocks and causes hydrocarbon maturation. Existing models of host-rock deformation are investigated using high-quality 3D seismic and industry well data in the western Møre Basin offshore mid-Norway. The models include synemplacement (e.g., elastic bending-related active uplift and volume reduction of metamorphic aureoles) and postemplacement (e.g., differential compaction) mechanisms. We use the seismic interpretations of five horizons in the Cretaceous-Paleogene sequence (Springar, Tang, and Tare Formations) to analyze the host rock deformation induced by the emplacement of the underlying saucer-shaped Tulipan sill. The results show that the sill, emplaced between 55.8 and 54.9 Ma, is responsible for the overlying dome structure observed in the seismic data. Isochron maps of the deformed sediments, as well as deformation of the younger postemplacement sediments, document a good match between the spatial distribution of the dome and the periphery of the sill. The thickness tt of the Tulipan is less than 100 m, whereas the amplitude ff of the overlying dome ranges between 30 and 70 m. Spectral decomposition maps highlight the distribution of fractures in the upper part of the dome. These fractures are observed in between hydrothermal vent complexes in the outer parts of the dome structure. The 3D seismic horizon interpretation and volume rendering visualization of the Tulipan sill reveal fingers and an overall saucer-shaped geometry. We conclude that a combination of different mechanisms of overburden deformation, including (1) elastic bending, (2) shear failure, and (3) differential compaction, is responsible for the synemplacement formation and the postemplacement modification of the observed dome structure in the Tulipan area.

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