Laboratory measurements of seismic attenuation in sandstone: Strain versus fluid saturation effects

Tisato, Nicola; Quintal, Beatriz

doi:10.1190/geo2013-0419.1

Cited by 61 publications

(45 citation statements)

References 21 publications

(45 reference statements)

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“…Furthermore, neither model accounts for the intrinsic attenuation observed in the dry sample. Then, also assuming it to be independent of the other two attenuation mechanisms, we add the mean attenuation measured in the dry sample to the model result (Tisato and Quintal , ). Young's modulus (Fig.…”

Section: Resultsmentioning

confidence: 99%

Forced oscillation measurements of seismic wave attenuation and stiffness moduli dispersion in glycerine‐saturated Berea sandstone

Chapman

Borgomano

Yin

et al. 2018

Geophysical Prospecting

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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.

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Section: Resultsmentioning

confidence: 99%

Forced oscillation measurements of seismic wave attenuation and stiffness moduli dispersion in glycerine‐saturated Berea sandstone

Chapman

Borgomano

Yin

et al. 2018

Geophysical Prospecting

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“…It is in consistent with the conclusion of Tisato and Quintal. 25 It can be clearly seen from Figure 13 that wave damping increases with an increasing nonlinearity parameter (e = H s1 /d) but only up to a value of e = 0.2. A further increase in e leads to a smaller wave damping.…”

Section: Effects Of Wave Heightmentioning

confidence: 90%

Experimental investigation of wave-driven pore-water pressure and wave attenuation in a sandy seabed

Zhang

Ding

et al. 2016

Advances in Mechanical Engineering

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Wave-seabed interaction has become a big concern of coastal researchers and engineers in the past decades as it may largely contribute to the seabed instability and failure of marine foundations. A series of laboratory experiments are carried out in a wave flume to study the wave-driven pore-water pressure in a sandy seabed and the attenuation of wave height. Waves propagating over a sandy seabed lead to oscillatory excess pore-water pressures within the porous seabed. Amplitude of pore-water pressure within the seabed decreases toward the bottom. A phase lag of pore-water pressure is clearly observed, and it contributes to net upward pressure related to seabed instability. Height of the incident wave is reduced as part of wave energy is dissipated by bottom friction, and a maximum attenuation of the incident wave height is up to 7.23% in the experiments. The influences of wave period and height of the incident wave on porewater pressure and wave attenuation are also analyzed and discussed.

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“…The measured attenuation in the partially saturated sample could be composed of the sum of the frequency‐dependent and frequency‐independent attenuation mechanisms. Tisato and Quintal () provided further experimental support for this hypothesis.…”

Section: Discussionmentioning

confidence: 79%

Laboratory measurements of seismic attenuation and Young's modulus dispersion in a partially and fully water‐saturated porous sample made of sintered borosilicate glass

Chapman

Quintal

Holliger

et al. 2018

Geophysical Prospecting

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We measured the extensional‐mode attenuation and Young's modulus in a porous sample made of sintered borosilicate glass at microseismic to seismic frequencies (0.05–50 Hz) using the forced oscillation method. Partial saturation was achieved by water imbibition, varying the water saturation from an initial dry state up to ∼99%, and by gas exsolution from an initially fully water‐saturated state down to ∼99%. During forced oscillations of the sample effective stresses up to 10 MPa were applied. We observe frequency‐dependent attenuation, with a peak at 1–5 Hz, for ∼99% water saturation achieved both by imbibition and by gas exsolution. The magnitude of this attenuation peak is consistently reduced with increasing fluid pressure and is largely insensitive to changes in effective stress. Similar observations have recently been attributed to wave‐induced gas exsolution–dissolution. At full water saturation, the left‐hand side of an attenuation curve, with a peak beyond the highest measured frequency, is observed at 3 MPa effective stress, while at 10 MPa effective stress the measured attenuation is negligible. This observation is consistent with wave‐induced fluid flow associated with mesoscopic compressibility contrasts in the sample's frame. These variations in compressibility could be due to fractures and/or compaction bands that formed between separate sets of forced‐oscillation experiments in response to the applied stresses. The agreement of the measured frequency‐dependent attenuation and Young's modulus with the Kramers–Kronig relations and additional data analyses indicate the good quality of the measurements. Our observations point to the complex interplay between structural and fluid heterogeneities on the measured seismic attenuation and they illustrate how these heterogeneities can facilitate the dominance of one attenuation mechanism over another.

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Laboratory measurements of seismic attenuation in sandstone: Strain versus fluid saturation effects

Cited by 61 publications

References 21 publications

Forced oscillation measurements of seismic wave attenuation and stiffness moduli dispersion in glycerine‐saturated Berea sandstone

Forced oscillation measurements of seismic wave attenuation and stiffness moduli dispersion in glycerine‐saturated Berea sandstone

Experimental investigation of wave-driven pore-water pressure and wave attenuation in a sandy seabed

Laboratory measurements of seismic attenuation and Young's modulus dispersion in a partially and fully water‐saturated porous sample made of sintered borosilicate glass

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