Heavy mineral sorting in downwards injected Palaeocene sandstone, Siri Canyon, Danish North Sea

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  • Afsoon Moatari Kazerouni, Danmark
  • Henrik Friis
  • Johan Byskov Svendsen, DONG Energy, Exploration and Production, Agern Allé 24-26, DK-2970 Hørsholm, Danmark
  • Rikke Weibel, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 København K, Danmark
Post-depositional remobilization and injection of sand are often seen in deep-water clastic systems and has been recently recognised as a significant modifier of deep-water sandstone geometry. Large-scale injectite complexes have been interpreted from borehole data in the Palaeocene Siri Canyon near the Danish Central Graben of the North Sea hydrocarbon province. The emplacement of
large-scale injectite complexes has been commonly attributed to seismic activity and consequent sand liquefaction. However, due to very small differences in textural and compositional properties, and the lack of depositional structures in deep-water sandstones, the distinction between "in situ" and injected or remobilised sandstones is often ambiguous. Large scale heavy mineral sorting (in 10 m thick units) is observed in several reservoir units in the Siri Canyon and has been interpreted to represent the depositional sorting. In this study we describe an example of effective shear-zone sorting of heavy minerals in a thin downward injected sandstone dyke which was encountered in one of the cores in the Cecilie Field, Siri Canyon. Differences in sorting pattern of heavy minerals are suggested as a tool for petrographic /geochemical distinction between "in situ" sandstones and their related injectites, especially where primary sedimentary structures are removed by fluidization or minor remobilization.
OriginalsprogEngelsk
TidsskriftSedimentary Geology
Vol/bind236
Nummer3-4
Sider (fra-til)279-285
Antal sider7
ISSN0037-0738
DOI
StatusUdgivet - 1 maj 2011

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