A comparison of coherency measurement using semblance and multiple signal classification, from a seismic-while-drilling perspective
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© 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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Sun, Bai Chun; Bóna, Andrej; Zhou, B.; King, A. (2014)We use the direct wave interferometry migration with coherency measurement to image the diamond drill-bit. The success of such imaging can prove if the direct waves from the drill-bit can be detected. The drilling signals ...
Diamond Drill-bit Seismic-While-Drilling Velocity Analysis Using Semblance and MUSIC from Hillside, South AustraliaSun, Bai Chun; Bona, Andrej; King, A.; Zhou, B. (2014)In this paper, we demonstrate the resolution differences between MUSIC and semblance using synthetic examples. Both methods are applied to detect coherent move-out from the drill-bit. The coherency can be used to obtain ...
Greenwood, Andrew John (2013)Seismic imaging in hard rock environments is gaining wider acceptance as a mineral exploration technique and as a mine-planning tool. However, the seismic images generated from hard rock targets are complex due to high ...