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    State of stress in exhumed basins and implications for fluid flow: insights from the Illizi Basin, Algeria

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    English Finkbeiner et al State of Stress in Exhumed Basins_v_2.3_SUBMITT....pdf
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    Type
    Article
    Authors
    English, Joseph M.
    Finkbeiner, Thomas cc
    English, Kara L.
    Yahia Cherif, Rachida
    KAUST Department
    Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
    Physical Science and Engineering (PSE) Division
    Date
    2017-05-30
    Online Publication Date
    2017-05-30
    Print Publication Date
    2017
    Permanent link to this record
    http://hdl.handle.net/10754/624951
    
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    Abstract
    The petroleum prospectivity of an exhumed basin is largely dependent on the ability of pre-existing traps to retain oil and gas volumes during and after the exhumation event. Although faults may act as lateral seals in petroleum traps, they may start to become hydraulically conductive again and enable fluid flow and hydrocarbon leakage during fault reactivation. We constrain the present day in situ stresses of the exhumed Illizi Basin in Algeria and demonstrate that the primary north–south and NW–SE (vertical strike-slip) fault systems in the study area are close to critical stress (i.e. an incipient state of shear failure). By contrast, the overpressured and unexhumed Berkine Basin and Hassi Messaoud areas to the north do not appear to be characterized by critical stress conditions. We present conceptual models of stress evolution and demonstrate that a sedimentary basin with benign in situ stresses at maximum burial may change to being characterized by critical stress conditions on existing fault systems during exhumation. These models are supportive of the idea that the breaching of a closed, overpressured system during exhumation of the Illizi Basin may have been a driving mechanism for the regional updip flow of high-salinity formation water within the Ordovician reservoirs during Eocene–Miocene time. This work also has implications for petroleum exploration in exhumed basins. Fault-bounded traps with faults oriented at a high angle to the maximum principal horizontal stress direction in strike-slip or normal faulting stress regimes are more likely to have retained hydrocarbons in exhumed basins than fault-bounded traps with faults that are more optimally oriented for shear failure and therefore have a greater propensity to become critically stressed during exhumation.
    Citation
    English JM, Finkbeiner T, English KL, Yahia Cherif R (2017) State of stress in exhumed basins and implications for fluid flow: insights from the Illizi Basin, Algeria. Geological Society, London, Special Publications: SP458.6. Available: http://dx.doi.org/10.1144/sp458.6.
    Sponsors
    We thank Petroceltic, Sonatrach and Enel for sponsoring this study and granting permission for publication. We thank Jonathan Hunter, John Naismith, Ciaran Nolan, Siya Gancheva, Fabrice Toussaint and Tim Wynn for various discussions over the course of this project, and also Richard Plumb and one anonymous reviewer for constructive feedback that helped to improve the quality of this paper.
    Publisher
    Geological Society of London
    Journal
    Geological Society, London, Special Publications
    DOI
    10.1144/sp458.6
    Additional Links
    http://sp.lyellcollection.org/content/early/2017/05/26/SP458.6
    ae974a485f413a2113503eed53cd6c53
    10.1144/sp458.6
    Scopus Count
    Collections
    Articles; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Physical Science and Engineering (PSE) Division

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