Lows and highs: using low frequencies and improved velocity tools to image complex ridges and basement highs in the Faroe-Shetland Basin

Hardwick, Anthony; Travis, T.; Stokes, S.; Hart, M.K.W.

doi:10.3997/1365-2397.28.9.41392

Cited by 11 publications

(2 citation statements)

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“…It has also been suggested that the north-south structural trends seen across the NE Atlantic margin may reflect the reactivation of pre-Caledonian or Caledonian suture zones, although direct evidence for this is sparse (Schiffer et al 2020). Assessing the origins of oblique faults mapped here (red faults in Figs 5, 14 and 15a) and any further extent of north-south-striking faulting across the FSB is challenging, as the imaging of basement structures are often obscured by overlying Paleogene lava flows and the Faroe-Shetland Sill Complex (Hardwick et al 2010). However, the identification of north-south structuration within the crystalline basement of the central-northern Corona Ridge suggests that such features could be more extensive than previously realized within the basin.…”

Section: Oblique Faults and Downflank Terraces Of The Corona Ridgementioning

confidence: 95%

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New insights into the structure, geology and hydrocarbon prospectivity along the central-northern Corona Ridge, Faroe–Shetland Basin.

Layfield

Schofield

Jolley

et al. 2023

84th EAGE Annual Conference &Amp; Exhibition

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The Faroe-Shetland Basin (FSB) is one of the only significant exploration frontiers remaining on the UK Continental Shelf. Over half of the basin's discovered reserves and resources lie along two intra-basinal highs, the Corona Ridge and the Rona Ridge. In contrast to the Rona Ridge, the central-northern Corona Ridge has received much less attention.To reveal new insights into the geology, structural configuration and hydrocarbon prospectivity of the central-northern Corona Ridge, we analyse 3D seismic data and data from the exploration wells 213/23-1 (Eriboll), 214/21a-2 (South Uist) and 213/25c-1V (North Uist). This study extends the Colsay T40-T45 sub-and intra-basaltic play concept from the Rosebank Field NE along the Corona Ridge, at least into well 213/23-1. Analysis also suggests that no Triassic strata are present within well 213/23-1, challenging the previous understanding of Triassic distribution within the central FSB. Our findings show that the centralnorthern Corona Ridge is structurally complex, comprising a series of discrete basement-bounding faults, downflank fault terraces and faults that are oblique to the dominant NE-SW-striking structural fabric of the FSB.

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Section: Oblique Faults and Downflank Terraces Of The Corona Ridgementioning

confidence: 95%

“…Publications that are focused on the Corona Ridge itself (e.g. Hardwick et al 2010) describe reprocessing methods to improve seismic imaging of the complex Corona Ridge. However, at the time of publication, no detailed maps showing the structural complexity of the Corona Ridge have been published.…”

Section: Previous Structural Interpretation Of the Corona Ridgementioning

confidence: 99%

New insights into the structure, geology and hydrocarbon prospectivity along the central-northern Corona Ridge, Faroe–Shetland Basin.

Layfield

Schofield

Jolley

et al. 2023

84th EAGE Annual Conference &Amp; Exhibition

View full text Add to dashboard Cite

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WITHDRAWN: References

Onajite¹

2017

Practical Solutions to Integrated Oil and Gas Reservoir Analysis

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3D Seismic reflection evidence for lower crustal intrusions beneath the Faroe–Shetland Basin, NE Atlantic Margin

Layfield

Schofield

Watson

et al. 2023

JGS

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Lower crustal intrusion is considered a common process along volcanic or magma-rich passive margins, including the NE Atlantic Margin, where it is considered to have occurred during phases of Paleogene magmatism, prior to and during continental break-up between NW Europe and Greenland. Evidence of Paleogene magmatism is prevalent throughout the sub-basins of the Faroe-Shetland Basin (FSB) as extensive lava flows and pervasive suites of igneous intrusions. However, in contrast to other areas located along the NE Atlantic Margin, no lower crustal reflectivity indicative of lower crustal intrusions has been documented beneath the FSB. The nearest documentation of lower crustal reflectivity and interpretation of lower crustal intrusions to the FSB is NW of the Fugloy Ridge, beneath the Norwegian Basin of the Faroese sector. Despite this, the addition of magma within the lower crust and/or at the Mohorovičić discontinuity is thought to have played a role regarding Paleogene uplift and the subsequent deposition of Paleocene-Eocene sequences. Advances in sub-basalt seismic acquisition and processing have made significant improvements in facilitating the imaging of deep crustal structures along the NE Atlantic Margin. This study uses broadband 3D seismic reflection data to map a series of deep ( c. 14 to 20 km depth) high-amplitude reflections which may represent igneous intrusions within the lower crust beneath the central-northern Corona Ridge. We estimate that the cumulative thicknesses of the reflections may be over 5 km in places, which is consistent with published values of magmatic underplating within the region based on geochemical and petrological data. We also estimate that the total volume of lower crustal high-amplitude reflections within the 3D dataset may be over 2000 km 3 . 2D gravity modelling of a seismic line located along the central-northern Corona Ridge supports the interpretation of lower crustal intrusions beneath the central-northern Corona Ridge. This study provides evidence of a potential mechanism for Paleogene uplift within the region. If uplift occurred as a result of lower crustal intrusions emplaced within the crust during the Paleogene, based on previous work, we estimate that around 300 m of uplift may have been generated within the Corona Ridge area.

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Lows and highs: using low frequencies and improved velocity tools to image complex ridges and basement highs in the Faroe-Shetland Basin

Cited by 11 publications

References 0 publications

New insights into the structure, geology and hydrocarbon prospectivity along the central-northern Corona Ridge, Faroe–Shetland Basin.

New insights into the structure, geology and hydrocarbon prospectivity along the central-northern Corona Ridge, Faroe–Shetland Basin.

WITHDRAWN: References

3D Seismic reflection evidence for lower crustal intrusions beneath the Faroe–Shetland Basin, NE Atlantic Margin

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