Effects of partial liquid/gas saturation on extensional wave attenuation in Berea sandstone

Yin, Caiyun; Batzle, Michael; Smith, Bonnie J.

doi:10.1029/92gl01159

Cited by 65 publications

(59 citation statements)

References 28 publications

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“…More details on sample sealing can be found in Tisato and Quintal (2013). Dunn (1987) and Yin et al (1992) show that a layer of glue or a metal foil glued on the external surface of the sample limits the free-flow boundary effect that could bias the measurements (Gardner, 1962;Dunn, 1986). On the other hand, Tisato and Madonna (2012) discuss that, for the considered rock and conditions, this effect should be significant only at frequencies higher than 100 Hz.…”

Section: Methodsmentioning

confidence: 99%

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

Tisato

Quintal

2014

GEOPHYSICS

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In the past few decades, great attention has been focused on uncovering the physics of seismic wave attenuation in fluid-saturated rocks. However, the relationship among many variables affecting attenuation is still not completely clear. For instance, although the role of strain in enhancing friction dissipation is relatively well known for dry rocks, it remains unclear how and how much it affects attenuation in fluid-saturated rocks. We experimentally measured attenuation in the extensional mode in Berea sandstone at strains between 7.8 × 10 −7 and 1.9 × 10 −5 , and at frequencies in the seismic bandwidth (1-100 Hz). These strains were similar to those typically observed in seismic exploration (∼10 −6 ). We also measured the transient fluid pressure caused when a stepwise stress was applied resulting in such strains. For the studied strain range, our results indicated that: (1) the overall attenuation in dry Berea sandstone increased linearly with strain, (2) the frequency-dependent component of attenuation, which was associated with fluid saturation, was approximately insensitive to strain, and (3) the overall attenuation can be considered as a sum of a frequencyindependent and a frequency-dependent components.

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Section: Methodsmentioning

confidence: 99%

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

Tisato

Quintal

2014

GEOPHYSICS

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“…The fluid accumulation should have a direct effect in the attenuation because many experimental studies have demonstrated that behavior (Frisillo and Stewart 1980;Tittmann et al 1980;Yin et al 1992;Dilay and Eastwood 1995). Although not all volcanic crises require gas accumulation, we suggest that those volcanic crises associated with eruptions, ash emission, or strong swarms of LP events or hybrid events should involve some portion of gas accumulation.…”

Section: Application Of the Warning Model For Nevado Del Ruiz Volcanomentioning

confidence: 97%

“…Experimental studies demonstrated that Q -1 is very sensitive to changes in the gas content and partial saturation in rocks (Devilbiss-Muñoz 1980;Frisillio and Stewart 1980;Yin et al 1992). Dilay and Eastwood (1995) seismically monitored attenuation during a steam flood used for oil production.…”

Section: The Construction Of the Warning Modelmentioning

confidence: 99%

A warning model based on temporal changes of coda Q for volcanic activity at Nevado Del Ruiz Volcano, Colombia

Londoño

Sudo

2002

Bull Volcanol

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The coda Q has been calculated for Nevado del Ruiz Volcano, Colombia (NRV) from 1985 to 1999 by using a single scattering model. During this period, the inverse of Q (Q -1 proportional to attenuation) exhibited a long-term decrease with time, as well as shorterterm variations related to the volcanic activity. Q -1 increased prior to volcanic crises and decreased afterward. Based on these observations, a seismic warning criterion has been developed. The parameters (frequency band, size of moving average window, and threshold levels) necessary to evidence clear and significant short-term changes in Q -1 have been investigated and appropriated values are proposed. We suggest a phenomenological model with three stages for the short-term temporal changes in Q -1 at NRV. Firstly, Q -1 increases before a volcanic crises because of accumulation of gas and/or liquid, which decreases the aspect ratio of fluid pockets and increases the fractional volume of fluid in the rocks and the pore aspect ratio. Secondly, Q -1 starts to decrease during the crises by the discharging of fluids such as gas, water, etc. from the volcano. Finally, Q -1 becomes more stable after the crisis at a lower value because of the degassing and/or increasing of rigidity of the medium because of the long-term crystallization and cooling processes. Q -1 seems to be a promising monitoring tool at NRV. It is possible that the observed temporal changes of Q -1 , combined with other parameters, may help to predict with greater accuracy a volcanic crisis at NRV.Keywords Coda Q · Fluid aspect ratio · Pore aspect ratio · Seismicity · Volcanic activity Method, data, and processingThe method used to calculate coda Q in this study is based on the assumption that coda waves are single S to Editorial responsibility: J.-F. Lénat

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“…The predicted attenuation increases with increasing permeability, but the location of the peak has little change. Yin et al [31] concluded that the peak is strongly dependent on the history of saturation. During the drainage the attenuation reaches a maximum at about 90% water saturation, and for imbibition the attenuation peak shifts toward a higher water saturation around 97%.…”

Section: Comparison With Experimental Datamentioning

confidence: 98%

Acoustic response characteristics of unsaturated porous media

Zhao

Wang

Chen

et al. 2010

Sci. China Phys. Mech. Astron.

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By employing the plane wave analysis method, the dispersion equations associated with compressional and shear waves using Santos's three-phase poroelastic theory were driven. Considering the reservoir pressure, the high frequency corrections and the coupling drag of two fluids in pores, the influences of frequency and gas saturation on the phase velocities and the inverse quality factors of four body waves predicted by Santos's theory were discussed in detail. The theoretical velocities of the fast compressional and shear waves were compared with the results of the low and high frequency experiments from open publications, respectively. The results showed that they are in good agreement in the low frequency case rather than in the high frequency case. In the latter case, several popular poroelastic models were considered and compared with the experimental data. In the models, the results of White's theory fit the experimental data, but the parameter b in White's model has a significant impact on the results. Under the framework of the linear viscoelasticity theory, the attenuation mechanism of Santos's model was extended, and the comparisons between the experimental and theoretical results were also made with respect to attenuation. For the case of water saturation less than 90%, the extended model makes good predictions of the inverse quality factor of shear wave. There is a significant difference between the experimental and theoretical results for the compressional wave, but the difference can be explained by the experimental data available. unsaturated porous media, poroelastic media, phase velocity, attenuation PACS: 43.20.Jr, 43.35.Cg, 91.60.LjPores of subsurface rocks or surface soil sometimes contain two types or more than two types of fluids such as water, gas and oil. In such situations, acoustic models of porous media saturated by more than one fluid should be established so that the models under consideration are more accordant to practice. Research results relating to the dynamic response of porous media filled up with two fluids have been applied extensively in geophysics, seismology, civil engineering, and in marine engineering. For the acoustic characteristics of porous materials, wave velocity and attenuation are two important properties that provide the information about lithology, pore fluids, saturation and the in situ conditions of rocks.Because of the universality of the existence of unsaturated porous media, which is one case of porous media containing two fluids, acoustic wave phenomena in such media have received a great deal of attention in recent years. Brandt [1] reported that in a water saturated quartz sand column, compressional wave velocity linearly decreases as the degree of water saturation decreases, and levels off at the saturation of 50%. Elliott and Wiley [2] performed ultrasonic laboratory experiments (700 kHz) for Ottawa rock samples and showed that in the range of 9%-85% water saturation, the velocity of compressional wave is unrelated to the saturation. They used Wyllie e...

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Effects of partial liquid/gas saturation on extensional wave attenuation in Berea sandstone

Cited by 65 publications

References 28 publications

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

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

A warning model based on temporal changes of coda Q for volcanic activity at Nevado Del Ruiz Volcano, Colombia

Acoustic response characteristics of unsaturated porous media

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