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Measurements of shock-induced guided and surface acoustic waves along boreholes in poroelastic materials
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10.1063/1.2191467
/content/aip/journal/jap/99/9/10.1063/1.2191467
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/9/10.1063/1.2191467

Figures

Image of FIG. 1.
FIG. 1.

Experimental configuration: A concentrically drilled porous sample bounded by a cylindrical shell. and represents the inner and external radius of the sample (see Table I), is the inner radius of the shock tube .

Image of FIG. 2.
FIG. 2.

Experimental configuration: A concentrically drilled porous sample bounded by a cylindrical shell. and represents the inner and external radius of the sample (see Table I), is the inner radius of the shock tube .

Image of FIG. 3.
FIG. 3.

Radial dependence of the average radial displacement (a) and pore pressure (b) associated with the S1 mode in the confined reservoir at frequencies of 30, 60, and . .

Image of FIG. 4.
FIG. 4.

The vertical shock tube employed in the acoustic experiments. The measuring section is shown in detail. The drawing is schematic and not to scale.

Image of FIG. 5.
FIG. 5.

Pressure recordings at different depths (b). The position of the pressure transducer is measured in centimeter from the top of the sample. For readability, traces have been shifted upwards. Previous measurements are reported for comparison (a). The time scale is relative to each series of experiments. The arrows indicate the arrival of the high-frequency content of each wave.

Image of FIG. 6.
FIG. 6.

Frequency-dependent phase velocity of the pseudo-Stoneley wave in the Berea sample. The experimental results are shown in dots and the theoretical calculations based on Biot’s theory as solid lines. The results obtained in the modified shock tube configuration are depicted in (b). For comparison, previous measurements are shown (a).

Image of FIG. 7.
FIG. 7.

Frequency-dependent attenuation coefficients of the pseudo-Stoneley wave in the sandstone confined reservoir. The experimental results are shown in dots and the theoretical calculations based on Biot’s theory as solid lines. The results obtained in the modified shock tube configuration are depicted in (b). For comparison, previous measurements are shown (a).

Image of FIG. 8.
FIG. 8.

Frequency-dependent phase velocities for the pseudo-Stoneley wave and the L3 mode in the synthetic N1 sample. The numerical calculations based on Biot’s theory are displayed as solid lines.

Image of FIG. 9.
FIG. 9.

Experimentally obtained velocities and specific attenuation coefficients for the L2 mode (fast P wave) in the N2 reservoir. In solid lines the numerical results for the L2 mode are shown. Biot’s predictions for the velocities and attenuation coefficients of the fast compressional wave in an unbounded medium are displayed as dashed lines.

Tables

Generic image for table
Table I.

Physical properties of the porous formations. N1 and N2 are synthetic porous materials made out of sintered glass, the Berea sandstone is a natural formation. The parameters reported in this table were independently measured in laboratory tests.

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/content/aip/journal/jap/99/9/10.1063/1.2191467
2006-05-11
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurements of shock-induced guided and surface acoustic waves along boreholes in poroelastic materials
http://aip.metastore.ingenta.com/content/aip/journal/jap/99/9/10.1063/1.2191467
10.1063/1.2191467
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