Conversion of borehole Stoneley waves to channel waves in coal [electronic resource].

Published:: Los Alamos, N.M. : Los Alamos National Laboratory, 1987.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: 12 : digital, PDF file
Additional Creators:: Los Alamos National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Evidence for the mode conversion of borehole Stoneley waves to stratigraphically guided channel waves was discovered in data from a crosswell acoustic experiment conducted between wells penetrating thin coal strata located near Rifle, Colorado. Traveltime moveout observations show that borehole Stoneley waves, excited by a transmitter positioned at substantial distances in one well above and below a coal stratum at 2025 m depth, underwent partial conversion to a channel wave propagating away from the well through the coal. In an adjacent well the channel wave was detected at receiver locations within the coal, and borehole Stoneley waves, arising from a second partial conversion of channel waves, were detected at locations above and below the coal. The observed channel wave is inferred to be the third-higher Rayleigh mode based on comparison of the measured group velocity with theoretically derived dispersion curves. The identification of the mode conversion between borehole and stratigraphically guided waves is significant because coal penetrated by multiple wells may be detected without placing an acoustic transmitter or receiver within the waveguide. 13 refs., 6 figs., 1 tab.

Report Numbers:

E 1.99:la-ur-87-877
E 1.99: conf-871012-2
conf-871012-2
la-ur-87-877

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Note:

Published through SciTech Connect.
01/01/1987.
"la-ur-87-877"
" conf-871012-2"
"DE87007490"
57. annual international meeting and exposition of the Society of Exploration Geophysicists, New Orleans, LA, USA, 11 Oct 1987.
Johnson, P.A.; Albright, J.N.

Funding Information:

W-7405-ENG-36

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