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    The properties of the near surface layers at Naylor Field, Otway, Australia

    Access Status
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    Authors
    Al-Jabri, Yousuf
    Urosevic, Milovan
    Dupuis, Christian
    Date
    2010
    Type
    Conference Paper
    
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    Citation
    Al-Jabri, Yousuf and Urosevic, Milovan and Dupuis, Christian. 2010. The properties of the near surface layers at Naylor Field, Otway, Australia, in Anderson-Mayes, A. (ed), 21st International Geophysical Conference and Exhibition, Aug 22 2010, pp. 52. Darling Harbour, MSW: CSIRO Publishing.
    Source Title
    Preview
    Source Conference
    21st International Geophysical Conference and Exhibition
    ISSN
    1443-2471
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/7162
    Collection
    • Curtin Research Publications
    Abstract

    A feature of the injection test site of Naylor Field is the near-surface karst topography. In such geological terrain, a change in water table level can influence the seismic response and cause changes in the seismic wave scattering pattern. High seismic repeatability is critical to the monitoring program of the Naylor Field because of the small time-lapse effect related to CO2 injection into a depleted gas reservoir (Naylor). To understand the effect of changing ground conditions on repeatability, we conducted so-called “micro-array” investigation of the near-surface layers at this site. Hence the aim of micro-array measurements was to determine the properties of the near surface layers during the wet and dry seasons. This could help us to understand and ultimately predict the seismic response and hence survey repeatability at a given site.Measurements of seismic response due to near surface property changes (seasonal) could help optimise the design of time lapse surveys which ultimately yields improved survey differencing. Measured elastic properties of the near surface are used to produce seismic response and predict repeatability as a function of the variable soil conditions. In this study we investigated the variation of elastic properties of both top soil and the deeper rugose clay-limestone interface as a function of water depth level. Such tests in fact simulate the measurements conducted in dry and wet seasons and help evaluate the effect of these seasonal variations on the seismic signature, which is then analysed in terms of non-repeatability. In this study, we use both micro-borehole (micro VSP) and micro-refraction arrays to analyse directional properties of the near-surface.

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      High seismic repeatability is critical to the monitoring program of the Naylor Field because of the small time-lapse effect related to CO2 injection into a depleted gas reservoir (Naylor). To understand the effect of ...
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      This study utilises repeated numerical tests to understand the effects of variable near-surface conditions on time-lapse seismic surveys. The numerical tests were aimed at reproducing the significant scattering observed ...
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