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    Stress deflections around salt diapirs in the gulf of mexico

    Access Status
    Fulltext not available
    Authors
    King, R.
    Backé, G.
    Tingay, Mark
    Hillis, R.
    Mildren, S.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    King, R. and Backé, G. and Tingay, M. and Hillis, R. and Mildren, S. 2012. Stress deflections around salt diapirs in the gulf of mexico. Geological Society Special Publication. 367 (1): pp. 141-153.
    Source Title
    Geological Society Special Publication
    DOI
    10.1144/SP367.10
    ISSN
    0305-8719
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/53625
    Collection
    • Curtin Research Publications
    Abstract

    Delta-deepwater fold-thrust belts are linked systems of extension and compression. Margin-parallel maximum horizontal stresses (extension) on the delta top are generated by gravitational collapse of accumulating sediment, and drive downdip margin-normal maximum horizontal stresses (compression) in the deepwater fold-thrust belt (or delta toe). This maximum horizontal stress rotation has been observed in a number of delta systems. Maximum horizontal stress orientations, determined from 32 petroleum wells in the Gulf of Mexico, are broadly margin-parallel on the delta top with a mean orientation of 060 and a standard deviation of 498. However, several orientations show up to 60° deflection from the regional margin-parallel orientation. Three-dimensional (3D) seismic data from the Gulf of Mexico delta top demonstrate the presence of salt diapirs piercing the overlying deltaic sediments. These salt diapirs are adjacent to wells (within 500 m) that demonstrate deflected stress orientations. The maximum horizontal stresses are deflected to become parallel to the interface between the salt and sediment. Two cases are presented that account for the alignment of maximum horizontal stresses parallel to this interface: (1) the contrast between geomechanical properties of the deltaic sediments and adjacent salt diapirs; and (2) gravitational collapse of deltaic sediments down the flanks of salt diapirs.

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