Measurements of sound speed, attenuation, and normal-incidence reflection coefficient in water-saturated glass beads as a function of porosity.

2009 ◽  
Vol 126 (4) ◽  
pp. 2168
Author(s):  
Theodore F. Argo ◽  
Matthew D. Guild ◽  
Preston S. Wilson ◽  
Matthias Schröter ◽  
Charles Radin ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Sound Speed ◽  
Normal Incidence ◽  
Glass Beads ◽  
Water Saturated

scholarly journals Sound speed in water-saturated glass beads as a function of frequency and porosity

2011 ◽  
Vol 129 (4) ◽  
pp. EL101-EL107 ◽  
Author(s):  
Theodore F. Argo ◽  
Matthew D. Guild ◽  
Preston S. Wilson ◽  
Matthias Schröter ◽  
Charles Radin ◽  
...  
Keyword(s):  
Sound Speed ◽  
Glass Beads ◽  
Water Saturated

Laboratory measurements of sound speed and attenuation in water‐saturated artificial sediments as a function of porosity.

2008 ◽  
Vol 124 (4) ◽  
pp. 2469-2469
Author(s):  
Theodore F. Argo ◽  
Matthew D. Guild ◽  
Preston S. Wilson ◽  
Charles Radin ◽  
Matthias Schröter ◽  
...  
Keyword(s):  
Sound Speed ◽  
Laboratory Measurements ◽  
Water Saturated ◽  
Artificial Sediments

Sediment sound speed dispersion inferences from broadband reflection coefficient measurements

2017 ◽  
Vol 141 (5) ◽  
pp. 3950-3950
Author(s):  
Charles W. Holland ◽  
Samuel Pinson ◽  
Derek R. Olson
Keyword(s):  
Reflection Coefficient ◽  
Sound Speed

Dynamic acoustoelastic testing of weakly pre-loaded unconsolidated water-saturated glass beads

2010 ◽  
Vol 128 (6) ◽  
pp. 3344-3354 ◽  
Author(s):  
Guillaume Renaud ◽  
Samuel Callé ◽  
Marielle Defontaine
Keyword(s):  
Glass Beads ◽  
Water Saturated

Impact of fluid saturation on the reflection coefficient of a poroelastic layer

Geophysics ◽  
2011 ◽  
Vol 76 (2) ◽  
pp. N1-N12 ◽  
Author(s):  
Beatriz Quintal ◽  
Stefan M. Schmalholz ◽  
Yuri Y. Podladchikov
Keyword(s):  
Fluid Flow ◽  
Reflection Coefficient ◽  
Analytical Solution ◽  
Quality Factor ◽  
Velocity Dispersion ◽  
Normal Incidence ◽  
Sand Layer ◽  
Partially Saturated ◽  
Fluid Saturation ◽  
Wave Induced

The impact of changes in saturation on the frequency-dependent reflection coefficient of a partially saturated layer was studied. Seismic attenuation and velocity dispersion in partially saturated (i.e., patchy saturated) poroelastic media were accounted for by using the analytical solution of the 1D White’s model for wave-induced fluid flow. White’s solution was applied in combination with an analytical solution for the normal-incidence reflection coefficient of an attenuating layer embedded in an elastic or attenuating background medium to investigate the effects of attenuation, velocity dispersion, and tuning on the reflection coefficient. Approximations for the frequency-dependent quality factor, its minimum value, and the frequency at which the minimum value of the quality factor occurs were derived. The approximations are valid for any two alternating sets of petrophysical parameters. An approximation for the normal-incidence reflection coefficient of an attenuating thin (compared to the wavelength) layer was also derived. This approximation gives insight into the influence of contrasts in acoustic impedance and/or attenuation on the reflectivity of a thin layer. Laboratory data for reflections from a water-saturated sand layer and from a dry sand layer were further fit with petrophysical parameters for unconsolidated sand partially saturated with water and air. The results showed that wave-induced fluid flow can explain low-frequency reflection anomalies, which are related to fluid saturation and can be observed in seismic field data. The results further indicate that reflection coefficients of partially saturated layers (e.g., hydrocarbon reservoirs) can vary significantly with frequency, especially at low seismic frequencies where partial saturation may often cause high attenuation.

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