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    A comparison of coherency measurement using semblance and multiple signal classification, from a seismic-while-drilling perspective

    Access Status
    Fulltext not available
    Authors
    Sun, B.
    Bona, Andrej
    King, A.
    Zhou, B.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Sun, B. and Bona, A. and King, A. and Zhou, B. 2014. A comparison of coherency measurement using semblance and multiple signal classification, from a seismic-while-drilling perspective. Geophysics. 80 (3): pp. KS27-KS39.
    Source Title
    Geophysics
    DOI
    10.1190/GEO2014-0079.1
    ISSN
    0016-8033
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/51099
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Society of Exploration Geophysicists.A diamond drill bit is usually considered to be an inadequate seismic vibration source. To detect and use weak drillbit-generated seismic wavefields in hard-rock drilling, we compared different coherency measures between a conventional method of semblance and a generalized multiple signal classification (MUSIC) algorithm. We tested the detectability and resolution differences between semblance and MUSIC with synthetic examples. MUSIC coherency has the advantage of higher resolution over semblance measurement when the source wavefronts are accurately predicted. In addition, we applied both methods to detect the coherent moveout of a diamond drill-bit signal from a hard rock seismic-whiledrilling experiment at Hillside, South Australia. We used the coherent moveout to estimate the overburden velocity around the borehole. We also performed interferometry migration using the coherency measurements to image the drillit position. Our analysis determined that the direct waves generated from a diamond drill bit at shallow depths can be successfully detected, allowing drill-bit imaging and the determination of formation velocity around the borehole.

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