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    State and origin of present-day stress fields in sedimentary basins

    133008_14640_Tingay_Stress_in_Sedimentary_Basins_ASEG_2009.pdf (772.7Kb)
    Access Status
    Open access
    Authors
    Tingay, Mark
    Date
    2009
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Tingay, Mark. 2009. State and origin of present-day stress fields in sedimentary basins, in Rod Lovibond (ed), Australian Society of Exploration Geophysicists 20th International Conference and Exhibition, Feb 22 2009. Adelaide: CSIRO Publishing.
    Source Title
    Australian Society of Exploration Geophysicists Extended Abstracts
    Source Conference
    Australian Society of Exploration Geophysicists 20th International Conference and Exhibition
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/8973
    Collection
    • Curtin Research Publications
    Abstract

    The present-day stress field provides fundamental insight into the forces driving plate tectonics and intra-plate deformation. Furthermore, knowledge of the present-day stress field is essential in petroleum, geothermal and mining geomechanics applications such as the stability of boreholes and tunnels, and improving production through natural and induced fractures. The World Stress Map (WSM) Project has, for over 20 years, compiled a public global database of present-day tectonic stress information to determine and understand the state of stress in the Earth's lithosphere. The WSM database has revealed that plate-scale stress fields are controlled by forces exerted at plate boundaries (e.g. mid-ocean ridges, continental collision zones), commonly resulting in regional stress orientations sub-parallel to plate motion. However, the state and origin of present-day stress fields at smaller scales, such as within sedimentary basins, remains poorly understood in comparison. Detailed analysis of present-day stresses from within 70 sedimentary basins commonly reveals significant and complex variations in the present-day stress orientation, both across basins and within fields. For example, borehole breakouts in the North German Basin, Nile Delta and the Baram Delta province of northwest Borneo indicate broad regional rotations in the horizontal stress orientation. The present-day maximum horizontal stress orientations in the Gulf of Thailand are approximately north-south at the basin-scale (perpendicular to plate motion) and are perturbed locally to be sub-parallel to fault strike. The North Sea and Permian Basin of Texas display widely varying stress orientations between fields, with some neighbouring fields exhibiting perpendicular stress orientations. Basin- and field-scale stress fields result from the complex combination of numerous factors acting at different scales, including far-field forces (e.g. plate boundary forces), basin geometry (e.g. the shape of deltaic wedges), geological structures (e.g. diapirs, faults), mechanical contrasts (e.g. evaporites, overpressured shales, detachment zones), topography and deglaciation.

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