Frequency and fluid effects on elastic properties of basalt: Experimental investigations

Frequency and fluid effects on elastic properties of basalt: Experimental investigations In order to investigate the effects of fluid and frequency on the elastic properties, we performed hydrostatic experiments on an Icelandic basalt specimen under both dry and saturated conditions. This basalt is characterized by a bimodal porosity, i.e., cracks and equant pores. The elastic properties ‐bulk moduli in our case‐ were investigated under high pressure through two experimental methods: (1) a classical one using ultrasonic P‐ and S‐waves velocities (frequency 106 Hz), (2) and a new one, using oscillation tests (frequency 10−2 Hz). In dry condition, experimental data show no significant difference between high (HF) and low (LF) frequency bulk moduli. However, in saturated conditions, two effects are highlighted: a physico‐chemical effect emphasized by a difference between drained and dry moduli, and a squirt‐flow effect evidenced by a difference between HF and LF undrained moduli. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Frequency and fluid effects on elastic properties of basalt: Experimental investigations

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Publisher
Wiley
Copyright
Copyright © 2010 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
D.O.I.
10.1029/2009GL041660
Publisher site
See Article on Publisher Site

Abstract

In order to investigate the effects of fluid and frequency on the elastic properties, we performed hydrostatic experiments on an Icelandic basalt specimen under both dry and saturated conditions. This basalt is characterized by a bimodal porosity, i.e., cracks and equant pores. The elastic properties ‐bulk moduli in our case‐ were investigated under high pressure through two experimental methods: (1) a classical one using ultrasonic P‐ and S‐waves velocities (frequency 106 Hz), (2) and a new one, using oscillation tests (frequency 10−2 Hz). In dry condition, experimental data show no significant difference between high (HF) and low (LF) frequency bulk moduli. However, in saturated conditions, two effects are highlighted: a physico‐chemical effect emphasized by a difference between drained and dry moduli, and a squirt‐flow effect evidenced by a difference between HF and LF undrained moduli.

Journal

Geophysical Research LettersWiley

Published: Jan 1, 2010

References

  • Elastic wave velocities and permeability evolution during compaction of Bleurswiller sandstone
    Fortin, Fortin; Schubnel, Schubnel; Guéguen, Guéguen
  • Deep downward fluid percolation driven by localized crust dilatation in Iceland
    Geoffroy, Geoffroy; Dorbath, Dorbath
  • Elastic wave velocities and permeability of cracked rocks
    Guéguen, Guéguen; Schubnel, Schubnel

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