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    Pockmark development in the Petrel Sub-basin, Timor Sea, Northern Australia: Seabed habitat mapping in support of CO2 storage assessments

    Access Status
    Fulltext not available
    Authors
    Nicholas, W.
    Nichol, S.
    Howard, F.
    Picard, K.
    Dulfer, H.
    Radke, L.
    Carroll, A.
    Tran, M.
    Siwabessy, Justy
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Nicholas, W. and Nichol, S. and Howard, F. and Picard, K. and Dulfer, H. and Radke, L. and Carroll, A. et al. 2014. Pockmark development in the Petrel Sub-basin, Timor Sea, Northern Australia: Seabed habitat mapping in support of CO2 storage assessments. Continental Shelf Research. 83: pp. 129-142.
    Source Title
    Continental Shelf Research
    DOI
    10.1016/j.csr.2014.02.016
    ISSN
    0278-4343
    School
    Centre for Marine Science and Technology
    URI
    http://hdl.handle.net/20.500.11937/52731
    Collection
    • Curtin Research Publications
    Abstract

    The extent to which fluids may leak from sedimentary basins to the seabed is a critical issue for assessing the potential of a basin for carbon capture and storage. The Petrel Sub-basin, located beneath central and eastern Joseph Bonaparte Gulf in tropical northern Australia, was identified as potentially suitable for the geological storage of CO2 because of its geological characteristics and proximity to offshore gas and petroleum resources. In May 2012, a multidisciplinary marine survey (SOL5463) was undertaken to collect data in two targeted areas of the Petrel Sub-basin to facilitate an assessment of its CO2 storage potential. This paper focuses on Area 1 of that survey, a 471km2 area of sediment-starved shelf (water depths of 78 to 102m), characterised by low-gradient plains, low-lying ridges, palaeo-channels and shallow pockmarks. Three pockmark types are recognised: small shallow unit pockmarks 10-20m in diameter (generally <1m, rarely to 2m deep), composite pockmarks of 150-300m diameter formed from the co-location of several cross-cutting pockmarks forming a broad shallow depression (<1m deep), and pockmark clusters comprised of shallow unit pockmarks co-located side by side (150-300m width overall, <1m deep). Pockmark distribution is non-random, focused within and adjacent to palaeo-channels, with pockmark clusters also located adjacent to ridges. Pockmark formation is constrained by AMS 14C dating of in situ mangrove deposits and shells to have begun after 15.5calkaBP when a rapid marine transgression of Bonaparte Shelf associated with meltwater pulse 1A drowned coastal mangrove environments. Pockmark development is likely an ongoing process driven by fluid seepage at the seabed, and sourced from CO2 produced in the shallow sub-surface (<2m) sediment. No evidence for direct connection to deeper features was observed. © 2014.

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