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    Numerical and field experiments for virtual source tomography, Perth Basin, Western Australia

    Access Status
    Open access via publisher
    Authors
    AlMalki, Majed
    Harris, Brett
    Dupuis, Christian
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    AlMalki, Majed and Harris, Brett and Dupuis, Christian. 2012. Numerical and field experiments for virtual source tomography, Perth Basin, Western Australia, in CSIRO (ed), 22nd International Geophysical Conference and Exhibition, Feb 26 2012. Brisbane, Australia: CSIRO.
    Source Title
    Numerical and field experiments for virtual source tomography, Perth Basin, Western Australia
    Source Conference
    22nd International Geophysical Conference and Exhibition
    DOI
    10.1071/ASEG2012ab288
    ISSN
    0160-4619
    URI
    http://hdl.handle.net/20.500.11937/18161
    Collection
    • Curtin Research Publications
    Abstract

    A virtual source method (VSM) field experiment was performed at the Mirrabooka Trial Aquifer Storage and Recovery Site in Perth Basin, Western Australia. The experiment used hydrophones deployed simultaneously in two adjacent vertical fibreglass-reinforced plastic monitoring wells. The objective was to provide detailed P-wave velocities between two wells using conventional vertical seismic profiling equipment. It was hoped that the recovery of detailed velocity distribution would provide insight into the distribution of sand and clay above and within a highly heterogeneous injection interval. For the purpose of validating the processing methods used and to gain insight into the radiation pattern of the virtual source, the field experiment was duplicated with finite element numerical modelling. For both numerical and field experiments the seismic energy was propagated using 150 surface source positions with 2 m source point spacing. The seismic energy was recorded simultaneously at two vertical boreholes with 23 hydrophones.The hydrophones on each string were spaced at 10 m intervals. For the numerical model, near-surface velocities were obtained from a refraction seismic survey. All other velocities were derived from acoustic wire-line logging and zero-offset VSP. The thickness of the unsaturated zone in the near-surface layer was approximately 5 m, with P-wave velocities ranging from 60 to 800 m/s. Beyond this was saturated sand/sandstone in which the P-wave velocity was close to 1600 m/s. We directly compare the velocity distributions derived from field and numerical modelling experiments and demonstrate that the virtual source method applied to dual vertical wells has considerable potential. Further analysis with numerical modelling indicates that detail in the crosswell velocity tomogram can potential be pushed to an even higher level of resolution by using dense receiver arrays.

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