2021
DOI: 10.1029/2021jb021643
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Seismic Wave Attenuation and Dispersion Due to Partial Fluid Saturation: Direct Measurements and Numerical Simulations Based on X‐Ray CT

Abstract: Quantitatively assessing seismic attenuation caused by fluid pressure diffusion (FPD) in partially saturated rocks is challenging because of its sensitivity to the spatial fluid distribution. To address this challenge we performed depressurization experiments to induce the exsolution of carbon dioxide from water in a Berea sandstone sample. In a first set of experiments we used medical X‐ray computed tomography (CT) to characterize the fluid distribution. At an equilibrium pressure of approximately 1 MPa and a… Show more

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Cited by 24 publications
(35 citation statements)
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“…Waves generate fluid flow in the pores and energy losses that can be observed in field and laboratory experiments [2][3][4]. Recent laboratory experiments performed in the seismic range have shown the frequency dependence of anelasticity in sandstones with partial gas or oil saturations [5][6][7], while experiments conducted in Reference [8] show a significant attenuation in the extensional and bulk deformation modes, as well as numerical simulations in close agreement with laboratory data.…”
Section: Introductionsupporting
confidence: 65%
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“…Waves generate fluid flow in the pores and energy losses that can be observed in field and laboratory experiments [2][3][4]. Recent laboratory experiments performed in the seismic range have shown the frequency dependence of anelasticity in sandstones with partial gas or oil saturations [5][6][7], while experiments conducted in Reference [8] show a significant attenuation in the extensional and bulk deformation modes, as well as numerical simulations in close agreement with laboratory data.…”
Section: Introductionsupporting
confidence: 65%
“…where p 12 = p 11 − 2p 66 . To compute the five independent frequency dependent and complex stiffness coefficients in ( 11)-( 16), we solve Equations ( 6)- (8) in Ω imposing no change in fluid content of both fluid phases, i.e., with the boundary conditions…”
Section: The Equivalent Viscoelastic Transversely-isotropic Mediummentioning
confidence: 99%
“…The experimental data of a Berea sandstone sample (40 mm in diameter and 80 mm in length) is reported by Chapman et al. (2021), where the frequency dependent P‐wave velocity and attenuation are measured between 0.1 and 1000 Hz by using the forced oscillation method. The sample (porosity 19.6% and permeability 270 mD) is dominated by quartz (∼80%–95%) and feldspar and clays (3%–8%) (Chapman et al., 2019; Kareem et al., 2017).…”
Section: Comparisons With Laboratory Measurementsmentioning
confidence: 99%
“…It is observed that when D f = 2.78 and r = 2-20 mm, 𝐴𝐴 𝐴𝐴 = 0.04 and r = 2-20 mm, and r 0 = 6.3 mm, 𝐴𝐴 𝐴𝐴 2 𝑟𝑟 = 0.5, and r = 2-20 mm, the measured P-wave velocities are lower than the theoretical ones (Figure 12a). According to Pimienta et al (2016) and Chapman et al (2021), the difference between the measured and predicted P-wave velocities at the low frequency end may be due to the presence of CO 2 in the remaining volume of the fluid lines, which results in the sample being partially drained. The present model can provide a reasonable match with the measured P-wave attenuation (Figure 12b).…”
Section: Berea Sandstonementioning
confidence: 99%
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