Cristin-resultat-ID: 1506963
Sist endret: 30. mai 2018, 14:29
NVI-rapporteringsår: 2018
Resultat
Vitenskapelig artikkel
2018

Seismic interpretation of sill complexes in sedimentary basins: Implications for the sub-sill imaging problem

Bidragsytere:
  • Christian Haug Eide
  • Nick Schofield
  • Isabelle Lecomte
  • Simon John Buckley og
  • John Anthony Howell

Tidsskrift

Journal of the Geological Society
ISSN 0016-7649
e-ISSN 2041-479X
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2018
Publisert online: 2017
Volum: 175
Hefte: 2
Sider: 193 - 209

Importkilder

Scopus-ID: 2-s2.0-85042941877

Beskrivelse Beskrivelse

Tittel

Seismic interpretation of sill complexes in sedimentary basins: Implications for the sub-sill imaging problem

Sammendrag

Application of 3D-seismic reflection-data to igneous systems in sedimentary basins has led to a revolution in the understanding of mafic sill-complexes. However, there is considerable uncertainty on how geometries and architecture of sill-complexes within the subsurface relates to those imaged in seismic reflection-data. To provide constraints on how sill-complexes in seismic data should be interpreted, we present synthetic seismograms generated from a seismic-scale (22x0.25 km) outcrop in East Greenland constrained by abundant field-data. This study highlights how overlying igneous rocks adversely affect imaging of underlying intrusions and rocks by decreasing seismic amplitude, frequency and making steeply dipping features near-impossible to image. Furthermore, seismic modelling in this study shows that, because of the high impedance contrast between siliciclastic host-rock and dolerites, very thin (1-5 m) intrusions should in principle be imaged in reflection-seismic data at 3 km depth. However, comparison with actual seismic data with well-data shows significant amounts of un-imaged sill intrusions, and this is likely due to limited seismic resolution, overburden complexity, inadequate velocity-models, and interference between reflections from closely spaced sills and sill-splays. Significant improvements to sill imaging and interpretation could be made by better predicting occurrence and geometry of sill intrusions and including these in velocity models.

Bidragsytere

Christian Haug Eide

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

Nick Schofield

  • Tilknyttet:
    Forfatter
    ved University of Aberdeen
Aktiv cristin-person

Isabelle Christine Lecomte

Bidragsyterens navn vises på dette resultatet som Isabelle Lecomte
  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

Simon John Buckley

  • Tilknyttet:
    Forfatter
    ved NORCE Energi og teknologi ved NORCE Norwegian Research Centre AS
  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

John Anthony Howell

  • Tilknyttet:
    Forfatter
    ved University of Aberdeen
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