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Diagnostics of seismic time-lapse effects of sandstones based on laboratory data

Moyano, Bernardo; Johansen, Tor Arne; Agersborg, Remy; Spikes, Kyle Thomas
Peer reviewed, Journal article
Published version
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Moyano et al_Geophysics_2014.pdf (1.555Mb)
URI
https://hdl.handle.net/1956/8702
Date
2014-09
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  • Department of Earth Science [861]
Original version
https://doi.org/10.1190/geo2013-0167.1
Abstract
We evaluated a viscoelastic modeling of P- and S-wave velocity dispersion, attenuation, pressure, and fluid effects for a set of siliciclastic rock samples. Our analysis used a published laboratory data set of 63 sandstones with a wide range of compositional heterogeneities. We observed a notable correlation between the (velocity and attenuation) pressure sensitivity and the abundance/lack of quartz in the samples. We included compliant pores (low-aspect ratio) proportionally to the content of secondary minerals to account for the differential sensitivity to pressure. The observed velocity and attenuation were well reproduced by the applied viscoelastic modeling. We found that pores of significantly different scale required pore fluid relaxation time constants of proportionally different magnitudes to reproduce the velocity and attenuation measurements. The relaxation time constant of crack-sized pores can be one order of magnitude smaller than the constant of mesopores. Moreover, the velocity dispersion and attenuation signatures revealed that a pore textural model dependent on lithological composition is critical in the prediction of time-lapse fluid and pressure responses.
Publisher
Society of Exploration Geophysicists
Journal
Geophysics
Copyright
Copyright 2012 Society of Exploration Geophysicists. All rights reserved, use is subject to SEG terms of use and conditions.

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