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Volume 67 Number 4
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Fluid pressure diffusion occurring on the microscopic scale is believed to be a significant source of intrinsic attenuation of mechanical waves propagating through fully saturated porous rocks. The so‐called squirt flow arises from compressibility heterogeneities in the microstructure of the rocks. To study squirt flow experimentally at seismic frequencies the forced oscillation method is the most adequate, but such studies are still scarce. Here we present the results of forced hydrostatic and axial oscillation experiments on dry and glycerine‐saturated Berea sandstone, from which we determine the dynamic stiffness moduli and attenuation at micro‐seismic and seismic frequencies (0.004–30 Hz). We observe frequency‐dependent attenuation and the associated moduli dispersion in response to the drained–undrained transition (∼0.1 Hz) and squirt flow (>3 Hz), which are in fairly good agreement with the results of the corresponding analytical solutions. The comparison with very similar experiments performed also on Berea sandstone in addition shows that squirt flow can potentially be a source of wave attenuation across a wide range of frequencies because of its sensitivity to small variations in the rock microstructure, especially in the aspect ratio of micro‐cracks or grain contacts.

© 2019 European Association of Geoscientists & Engineers © 2018 European Association of Geoscientists & Engineers
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2018-11-08
2024-04-23

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Forced oscillation measurements of seismic wave attenuation and stiffness moduli dispersion in glycerine‐saturated Berea sandstone
Geophysical Prospecting 67, 956 (2019); https://doi.org/10.1111/1365-2478.12710
/content/journals/10.1111/1365-2478.12710
/content/journals/10.1111/1365-2478.12710
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  • Article Type: Research Article
Keyword(s): Attenuation; Rock physics

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