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    The mounded nature of the Balder Field area

    Morris, Simon Patrick (2014) The mounded nature of the Balder Field area. MPhil thesis, Birkbeck, University of London.

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    Abstract

    The Balder, Grane and Ringhorne oil fields locate on the north-western flank of the Utsira High in the Norwegian sector of the North Sea. Reservoir sandstones deposited by gravity flows during the Palaeocene and Eocene Epochs originate from the East Shetland platform, to the West. The post-deposition effects of remobilization and injection are known to distort deposited sandstones creating irregular reservoir characteristics. It is also known that post-depositional processes are non-uniform, affecting sedimentary bodies variably. Low magnitude remobilization will cause minor geometrical distortion, whereas high magnitude deformation connects noncontemporaneous sands, destroying depositional geometries and potentially complicating hydrocarbon extraction. Cored section, wireline logs and 3D seismic data allow description of the reservoir interval. Wireline logs do not facilitate identification of post-depositional processes, as remobilized and injected sandstone posses a non-unique signature. Cored section, however, allows direct identification of remobilized and injected sandstones. Seismic data, when calibrated by cored section can identify remobilized and injected sandstones. However, injected sandstones observed in cored section in Balder and Ringhorne Fields is seismically unresolvable. Eighteen steep sided mounds are identified in the study area. Seismic geometries tentatively suggest Balder Field as having experience higher magnitude soft sediment deformation than Grane Field, which is of a higher magnitude than Ringhorne Field. Crosscutting seismic reflections emanate from crests and flanks of mounds in Balder Field and Grane Fields. Injected sandstones are identified in cored section in each of the field areas.

    Metadata

    Item Type: Thesis
    Additional Information: Date of MPhil award confirmed as 2014 by registry
    Copyright Holders: The copyright of this thesis rests with the author, who asserts his/her right to be known as such according to the Copyright Designs and Patents Act 1988. No dealing with the thesis contrary to the copyright or moral rights of the author is permitted.
    Depositing User: Acquisitions And Metadata
    Date Deposited: 17 Sep 2014 11:09
    Last Modified: 14 Jun 2021 18:54
    URI: https://eprints.bbk.ac.uk/id/eprint/40076

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