Laboratory measurements of stress-induced velocity anisotropy in unconsolidated sands

Don Sherlock; Kurt Nihei; Seiji Nakagawa; Luca Duranti

doi:10.1071/ASEG2007ab130

ISSN: 2202-0586
E-ISSN:

oa Laboratory measurements of stress-induced velocity anisotropy in unconsolidated sands
Authors Don Sherlock^a, Kurt Nihei^b, Seiji Nakagawa^c and Luca Duranti^d
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^a CSIRO Petroleum, 26 Dick Perry Ave Kensington, WA, 6151, [email protected] ^b Chevron ETC, 6001 Bollinger Canyon Rd San Ramon, CA, 94583, [email protected] ^c Lawrence Berkeley National Lab., 1 Cyclotron Rd Berkeley, CA, [email protected] ^d Chevron ETC, 1 Westferry Circus, Canary Wharf London, E144HA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab130
- Published online: 01 Dec 2007

Abstract

Summary

An experimental device for measuring the transverse isotropic (TI) elastic properties of sediments under uniaxial strain conditions has been developed. The phased array compaction cell utilizes matched sets of Pand S-wave ultrasonic transducers located along the sides of the sample and an ultrasonic P-wave phased array source with pinducer receiver on the ends of the sample. The phased array provides plane P-waves that are used to measure phase velocities over a range of angles. From these measurements, the five elastic constants for TI media can be recovered as the sediment is compacted, without the need for sample unloading or reorienting. Descriptions of the apparatus and data processing and an application to an unconsolidated sand sample are provided in this paper. P-wave anisotropy of 20% has been observed in dry sand under an axial stress of 5 MPa.

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2007-12-01

2026-01-24

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References

Chen, G., Yale, D., Huang, X., Xu, S., Finn, C., and Boitnott, G., 2006, Stress-induced velocity anisotropy of unconsolidated sand under realistic reservoir stress conditions: 76th Annual International Meeting, SEG, Expanded Abstracts, 1879-1882.
Dewhurst, D. N., and Siggins, A. F., 2004, Impact of stress and sedimentary anisotropies on velocity anisotropy in shale: 74th Annual International Meeting, SEG, Expanded Abstracts, 1650-1653
Ismail, M. A., Sharma, S. S., and Fahey, M., 2005, A small true triaxial apparatus with wave velocity measurement: Geotechnical Testing Journal, 28 (2), 1-10.
Kebaili, A., and Schmitt, D. R., 1997, Ultrasonic anisotropic phase velocity determination with the Radon transformation: Journal of the Acoustical Society of America, 101 (6), 3278-3286.
Miller, D.E., and Spencer, C., 1994. An exact inversion for anisotropic moduli from phase slowness data, J. Geophys. Res., 99 (B11), 21651-21657.
Nihei, K. T., Reverdy, F., Nakagawa, S., Myer, L.R., Ball, G. A., and Duranti, L., Phased array compaction cell for measurement of the anisotropic elastic properties of compacting clay-rich sediments (unpublished)
Thomsen, L.,1986. Weak elastic anisotropy: Geophysics, 51, 1954-1966.
Vega, S., Mavko, G., Nur, A., and Prasad, M., 2006, Detection of stress-induced velocity anisotropy in unconsolidated sands: The Leading Edge, 25 (3),252-256.
Xu, S., 2002, Stress-induced anisotropy in unconsolidated sands and its affect on AVO analysis: 72nd Annual International Meeting, SEG, Expanded Abstracts, 105-108.

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Article Type: Research Article

Keyword(s): Anisotropy; multicomponent seismic.; unconsolidated sand

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oa Laboratory measurements of stress-induced velocity anisotropy in unconsolidated sands

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