Seismic investigations of buried tunnel valleys on- and offshore Denmark

Theis Raaschou Andersen, Mads Huuse, Flemming Jørgensen, Steen Christensen

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    16 Citations (Scopus)

    Abstract

    Tunnel valleys on- and offshore Denmark have been investigated based on a database of 1000 km two-dimensional (2D) onshore seismic data, 5600 km 2D offshore seismic data and 1200 km 2 three-dimensional (3D) offshore seismic data. From the 2D data we identified 216 onshore and 674 offshore seismic tunnel valley intersections, and 55 individual valleys were identified from three 3D surveys. The majority of the valleys have depths ranging from 50 to 200 m and widths between 500 and 1500 m. Up to seven generations of tunnel valleys were identified, indicating repeated erosion and deposition within the study area. The valleys were most likely formed by subglacial meltwater erosion during the last three glaciations. Statistical analyses conducted on the data show that there are no significant differences between the onshore and offshore valleys with respect to their depth and shape; they share morphological and structural characteristics. The onshore seismic data have been analysed in conjunction with lithological information from boreholes. The analyses show that tunnel valley bottoms terminate equally commonly in substrates dominated by clay and sand, and that the valley shapes are similar for the two substrates.

    Original languageEnglish
    Title of host publicationGlaciogenic reservoirs and hydrocarbon systems
    EditorsM. Huuse, J. Redfern, D.P. le Heron, R.J. Dixon, A. Moscariello, J. Craig
    Place of PublicationLondon
    PublisherGeological Society of London
    Pages129-144
    Number of pages16
    ISBN (Electronic)978-1-86239-348-6
    DOIs
    Publication statusPublished - 2012

    Publication series

    SeriesGeological Society, London, Special Publications
    Volume368

    Programme Area

    • Programme Area 2: Water Resources

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