Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks

Jérôme Fortin; L. Pimienta; Y. Guéguen; A. Schubnel; E. C. David; M. Adelinet

doi:10.1190/tle33060648.1

Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks

Jérôme Fortin^*, L. Pimienta, Y. Guéguen, A. Schubnel, E. C. David, M. Adelinet

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

39 Citations (Scopus)

Abstract

Experimental results are presented on the dispersive nature of elastic waves in porous rocks. These results show the combined effects of frequency, pressure, and fluid viscosity on the bulk modulus in fluid-saturated sandstone and basalt. At low frequency (0.1 Hz), samples behave as though fully drained: The bulk modulus remains unchanged under argon-, glycerin-, and water-saturated conditions. However, the high-frequency (or unrelaxed) bulk modulus, deduced from ultrasonic velocities, is clearly modified by the nature of the fluid. In addition, the bulk dispersion between low and high frequencies is significant at low confining pressure when cracks are open and decreases as cracks are closed. Although cracks represent a small fraction of total porosity, they produce a dispersion caused by squirt-flow processes. A simple quantitative model can be used to predict the frequency effect and explain the experimental results well.

Original language	English
Pages (from-to)	648-654
Number of pages	7
Journal	Leading Edge
Volume	33
Issue number	6
DOIs	https://doi.org/10.1190/tle33060648.1
Publication status	Published - Jun 2014

Access to Document

10.1190/tle33060648.1

Cite this

@article{beb446bfe9c04e24bf048a5caf4ff6ee,

title = "Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks",

abstract = "Experimental results are presented on the dispersive nature of elastic waves in porous rocks. These results show the combined effects of frequency, pressure, and fluid viscosity on the bulk modulus in fluid-saturated sandstone and basalt. At low frequency (0.1 Hz), samples behave as though fully drained: The bulk modulus remains unchanged under argon-, glycerin-, and water-saturated conditions. However, the high-frequency (or unrelaxed) bulk modulus, deduced from ultrasonic velocities, is clearly modified by the nature of the fluid. In addition, the bulk dispersion between low and high frequencies is significant at low confining pressure when cracks are open and decreases as cracks are closed. Although cracks represent a small fraction of total porosity, they produce a dispersion caused by squirt-flow processes. A simple quantitative model can be used to predict the frequency effect and explain the experimental results well.",

author = "J{\'e}r{\^o}me Fortin and L. Pimienta and Y. Gu{\'e}guen and A. Schubnel and David, {E. C.} and M. Adelinet",

year = "2014",

month = jun,

doi = "10.1190/tle33060648.1",

language = "English",

volume = "33",

pages = "648--654",

journal = "Leading Edge",

issn = "1070-485X",

publisher = "Society of Exploration Geophysicists",

number = "6",

}

TY - JOUR

T1 - Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks

AU - Fortin, Jérôme

AU - Pimienta, L.

AU - Guéguen, Y.

AU - Schubnel, A.

AU - David, E. C.

AU - Adelinet, M.

PY - 2014/6

Y1 - 2014/6

N2 - Experimental results are presented on the dispersive nature of elastic waves in porous rocks. These results show the combined effects of frequency, pressure, and fluid viscosity on the bulk modulus in fluid-saturated sandstone and basalt. At low frequency (0.1 Hz), samples behave as though fully drained: The bulk modulus remains unchanged under argon-, glycerin-, and water-saturated conditions. However, the high-frequency (or unrelaxed) bulk modulus, deduced from ultrasonic velocities, is clearly modified by the nature of the fluid. In addition, the bulk dispersion between low and high frequencies is significant at low confining pressure when cracks are open and decreases as cracks are closed. Although cracks represent a small fraction of total porosity, they produce a dispersion caused by squirt-flow processes. A simple quantitative model can be used to predict the frequency effect and explain the experimental results well.

AB - Experimental results are presented on the dispersive nature of elastic waves in porous rocks. These results show the combined effects of frequency, pressure, and fluid viscosity on the bulk modulus in fluid-saturated sandstone and basalt. At low frequency (0.1 Hz), samples behave as though fully drained: The bulk modulus remains unchanged under argon-, glycerin-, and water-saturated conditions. However, the high-frequency (or unrelaxed) bulk modulus, deduced from ultrasonic velocities, is clearly modified by the nature of the fluid. In addition, the bulk dispersion between low and high frequencies is significant at low confining pressure when cracks are open and decreases as cracks are closed. Although cracks represent a small fraction of total porosity, they produce a dispersion caused by squirt-flow processes. A simple quantitative model can be used to predict the frequency effect and explain the experimental results well.

UR - http://www.scopus.com/inward/record.url?scp=84901938557&partnerID=8YFLogxK

U2 - 10.1190/tle33060648.1

DO - 10.1190/tle33060648.1

M3 - Article

SN - 1070-485X

VL - 33

SP - 648

EP - 654

JO - Leading Edge

JF - Leading Edge

IS - 6

ER -

Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks

Abstract

Access to Document

Other files and links

Fingerprint

Cite this