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  • 1
    Publication Date: 2017-07-18
    Description: Extract Geomechanics investigates the origin, magnitude and deformational consequences of stresses in the crust. Perhaps the earliest description of geology and mechanics was from the sandbox experiments of Willis (1891), and many of the guiding principles were developed by Anderson (1951), Hubbert & Willis (1957), Jaeger & Cook (1979) and Engelder (1992), with input from engineering disciplines (e.g. Griffith 1921). Subsequently, geomechanics has grown such that it now constitutes an important subdiscipline within the geosciences, as witnessed by the increase in SPE papers with ‘geomechanics’ in their titles ( Addis 2017 ). In recent years, awareness of geomechanical processes has been heightened by societal debates on fracking, human-induced seismicity, natural geohazards and safety issues with respect to petroleum exploration drilling, carbon sequestration and radioactive waste disposal. ... This 250-word extract was created in the absence of an abstract.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 2
    Publication Date: 2014-07-09
    Description: Porosity and permeability are notoriously difficult to predict in carbonates, especially prior to drilling when there is a lack of direct petrophysical data. The aim of this paper is to document the initial results of an integrated outcrop and laboratory study designed to investigate the relationships between pore systems and acoustic velocities in faulted Oligo-Miocene carbonates on the Mediterranean islands of Malta and Gozo. Depositional facies is shown to have a significant effect, with velocities in grain-dominated carbonates up to 1000 m s –1 higher than those in micrite-dominated carbonates. Based on outcrop structural data, the fault zones can be separated into three architectural components: a fault core; an intensely damaged zone; and a weakly damaged zone, with the last passing into undamaged protolith. Our data suggest that only the fault core component can be identified using porosity–velocity data, with P-wave velocity ( V p ) values of 5000–6500 m s –1 at helium porosities of less than 5%. Our study is novel in that the prediction of elastic properties and acoustic velocities across fault zones is anticipated by linking laboratory-scale measurements with seismic-scale predictions through quantitative rock physics modelling.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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