3D seismic imaging of lower delta-plain beach ridges

lower Brent Group, northern North Sea

Christopher A.-L. Jackson (Corresponding Author), Henrike Grunhagen, John A. Howell, Ane L. Larsen, Annika Andersson, Frede Boen, Audun Groth

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Three-dimensional seismic reflection data are used to image littoral deposits within the lower Brent Group, northern North Sea. Seismic attribute maps within the unit indicate the development of parallel, high-amplitude stripes up to 15 km in length, 50–100 m wide and spaced 150–200 m apart. In map view these features trend NE–SW to ENE–WSW and are arranged into ‘sets' that display subtly different orientations. Well data in regions where these anomalies are well developed indicate pronounced anomaly-perpendicular thickness variations in sand-rich beach-ridge facies within the Etive Formation and coals and mudstones within the overlying Ness Formation. Based on these observations, the high-amplitude anomalies are interpreted as the seismic expression of coal-filled swales, whereas the adjacent zones of low amplitude are interpreted to represent the cores of sand-rich beach ridges. The geometry of beach ridges identified in the Etive Formation compares favourably with sedimentological and geometric data from modern beach ridges. The results of this study have implications for (1) the stratigraphic context and preservation of beach ridges, (2) datum selection when attempting stratigraphic correlations within the Brent Group, and (3) the exploration and production of hydrocarbons from beach ridge-type reservoirs.
Original languageEnglish
Pages (from-to)1225-1236
Number of pages12
JournalJournal of the Geological Society
Volume167
Issue number6
DOIs
Publication statusPublished - 1 Dec 2010

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beach ridge
anomaly
coal
sand
stratigraphic correlation
seismic reflection
mudstone
plain
sea
hydrocarbon
geometry

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3D seismic imaging of lower delta-plain beach ridges : lower Brent Group, northern North Sea. / Jackson, Christopher A.-L. (Corresponding Author); Grunhagen, Henrike; Howell, John A.; Larsen, Ane L.; Andersson, Annika; Boen, Frede; Groth, Audun.

In: Journal of the Geological Society , Vol. 167, No. 6, 01.12.2010, p. 1225-1236.

Research output: Contribution to journalArticle

Jackson, Christopher A.-L. ; Grunhagen, Henrike ; Howell, John A. ; Larsen, Ane L. ; Andersson, Annika ; Boen, Frede ; Groth, Audun. / 3D seismic imaging of lower delta-plain beach ridges : lower Brent Group, northern North Sea. In: Journal of the Geological Society . 2010 ; Vol. 167, No. 6. pp. 1225-1236.
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title = "3D seismic imaging of lower delta-plain beach ridges: lower Brent Group, northern North Sea",
abstract = "Three-dimensional seismic reflection data are used to image littoral deposits within the lower Brent Group, northern North Sea. Seismic attribute maps within the unit indicate the development of parallel, high-amplitude stripes up to 15 km in length, 50–100 m wide and spaced 150–200 m apart. In map view these features trend NE–SW to ENE–WSW and are arranged into ‘sets' that display subtly different orientations. Well data in regions where these anomalies are well developed indicate pronounced anomaly-perpendicular thickness variations in sand-rich beach-ridge facies within the Etive Formation and coals and mudstones within the overlying Ness Formation. Based on these observations, the high-amplitude anomalies are interpreted as the seismic expression of coal-filled swales, whereas the adjacent zones of low amplitude are interpreted to represent the cores of sand-rich beach ridges. The geometry of beach ridges identified in the Etive Formation compares favourably with sedimentological and geometric data from modern beach ridges. The results of this study have implications for (1) the stratigraphic context and preservation of beach ridges, (2) datum selection when attempting stratigraphic correlations within the Brent Group, and (3) the exploration and production of hydrocarbons from beach ridge-type reservoirs.",
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N1 - Funding and data for this project were made available by Norsk Hydro ASA (now Statoil ASA), which is also acknowledged for permission to publish this article. The concepts and ideas presented in this paper have benefited significantly from discussion with colleagues in Norsk Hydro, Statoil and the partners in the Oseberg Øst production licence. The views presented here-in remain those of the authors. The paper has benefited from constructive reviews by Stuart Archer, an anonymous reviewer and the editorial guidance of Tim Needham. Rocksource ASA is acknowledged for financial support for the colour figures.

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N2 - Three-dimensional seismic reflection data are used to image littoral deposits within the lower Brent Group, northern North Sea. Seismic attribute maps within the unit indicate the development of parallel, high-amplitude stripes up to 15 km in length, 50–100 m wide and spaced 150–200 m apart. In map view these features trend NE–SW to ENE–WSW and are arranged into ‘sets' that display subtly different orientations. Well data in regions where these anomalies are well developed indicate pronounced anomaly-perpendicular thickness variations in sand-rich beach-ridge facies within the Etive Formation and coals and mudstones within the overlying Ness Formation. Based on these observations, the high-amplitude anomalies are interpreted as the seismic expression of coal-filled swales, whereas the adjacent zones of low amplitude are interpreted to represent the cores of sand-rich beach ridges. The geometry of beach ridges identified in the Etive Formation compares favourably with sedimentological and geometric data from modern beach ridges. The results of this study have implications for (1) the stratigraphic context and preservation of beach ridges, (2) datum selection when attempting stratigraphic correlations within the Brent Group, and (3) the exploration and production of hydrocarbons from beach ridge-type reservoirs.

AB - Three-dimensional seismic reflection data are used to image littoral deposits within the lower Brent Group, northern North Sea. Seismic attribute maps within the unit indicate the development of parallel, high-amplitude stripes up to 15 km in length, 50–100 m wide and spaced 150–200 m apart. In map view these features trend NE–SW to ENE–WSW and are arranged into ‘sets' that display subtly different orientations. Well data in regions where these anomalies are well developed indicate pronounced anomaly-perpendicular thickness variations in sand-rich beach-ridge facies within the Etive Formation and coals and mudstones within the overlying Ness Formation. Based on these observations, the high-amplitude anomalies are interpreted as the seismic expression of coal-filled swales, whereas the adjacent zones of low amplitude are interpreted to represent the cores of sand-rich beach ridges. The geometry of beach ridges identified in the Etive Formation compares favourably with sedimentological and geometric data from modern beach ridges. The results of this study have implications for (1) the stratigraphic context and preservation of beach ridges, (2) datum selection when attempting stratigraphic correlations within the Brent Group, and (3) the exploration and production of hydrocarbons from beach ridge-type reservoirs.

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