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    Variation in vertical stress in the Baram Basin, Brunei: tectonic and geomechanical implications

    135306_135306.pdf (2.609Mb)
    Access Status
    Open access
    Authors
    Tingay, Mark
    Hillis, R.
    Morley, C.
    Swarbrick, R.
    Okpere, E.
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tingay, M.R.P. and Hillis, R.R. and Morley, C.K. and Swarbrick, R.E. and Okpere, E.C. 2003. Variation in vertical stress in the Baram Basin, Brunei: tectonic and geomechanical implications. Marine and Petroleum Geology. 20 (10): pp. 1201-1212.
    Source Title
    Marine and Petroleum Geology
    DOI
    10.1016/j.marpetgeo.2003.10.003
    ISSN
    02648172
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/30452/description#description. Copyright © 2003 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/14155
    Collection
    • Curtin Research Publications
    Abstract

    The vertical or lithostatic stress is an important factor in tectonic and geomechanical studies and is commonly used in the prediction of pore pressures and fracture gradients. However, the vertical stress is not always calculated in situ and the approximation of 1.0 psi/ft (22.63 MPa/km) is often used for the vertical stress gradient. Vertical stress has been determined in 24 fields in the Baram Basin, Brunei, using density log and checkshot velocity survey data. The Baram Basin shows a variation in vertical stress gradient between 18.3 and 24.3 MPa/km at 1500 m depth below the surface. This variation has a significant effect on in situ stress related issues in field development such as wellbore stability and fracture stimulation. The variation is caused by a bulk rock density change of 2.48-2.07 g/cm3 from the hinterland of the delta to its front. Differential uplift and erosion of the delta hinterland and undercompaction associated with overpressure are the interpreted causes of the density and hence vertical stress variation.

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