1887

Abstract

Summary

When acquiring and interpreting seismic data at the field scale, one aims to gain insights on the rocks travelled through as well as the saturating fluid. One interesting property for such studies is the Vp/Vs ratio that allows insights independently of the density effects. Assuming the media to be isotropic, this ratio directly relates to Poisson’s ratio, an intrinsic property of the rock. Over the last decades, dispersion and attenuation effects were shown to occur on Vp and Vs, but Poisson’s ratio is often assumed to be independent of the measuring frequency.

In this study, provided that dissipation phenomena are observed on the elastic constants, it is shown theoretically that the same is expected for Poisson’s ratio. Moreover, measurements on a viscoelastic material and a poroelastic rock confirm this observation. For the rock sample, the measured dispersion/attenuation phenomena are large when fluid pressure is high or confining pressure is low. At the field scale, Vp/Vs ratio would indeed be a clear proxy of a high fluid pressure, and the ratio in attenuations could be a very interesting asset.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201700570
2017-06-12
2024-03-28
Loading full text...

Full text loading...

References

  1. Adam, L., Batzle, M., and Brevik, I.
    , 2006, Gassmann’s fluid substitution and shear modulus variability in carbonates at laboratory seismic and ultrasonic frequencies, Geophysics, 71(6), F173–F183.
    [Google Scholar]
  2. AdelinetM., FortinJ., GuéguenY., SchubnelA. & GeoffroyL.
    , 2010, Frequency and fluid effects on elastic properties of basalt: Experimental investigations, Geophysical Research Letters, 37, L02303.
    [Google Scholar]
  3. BatzleM. L., HanD. H. & HofmannR.
    , 2006, Fluid mobility and frequency-dependent seismic velocity: Direct measurements, Geophysics, 71, N1–N9.
    [Google Scholar]
  4. Boudet, J. F., and Ciliberto, S.
    , 1998, Interaction of sound with fast crack propagation, Physical review letters, 80(2), 341.
    [Google Scholar]
  5. BourbiéT. & ZinsnerB.
    , 1985, Hydraulic and acoustic properties as a function of porosity in Fontainebleau sandstone, Journal of Geophysical Research: Solid Earth, 90, 11524–11532.
    [Google Scholar]
  6. FortinJ., PimientaL., GuéguenY., SchubnelA., DavidE. C., & AdelinetM.
    , 2014, Experimental results on the combined effects of frequency and pressure on the dispersion of elastic waves in porous rocks, The Leading Edge, 33(6), 648–654.
    [Google Scholar]
  7. MadonnaC. & TisatoN.
    , 2013, A new Seismic Wave Attenuation Module to experimentally measure low-frequency attenuation in extensional mode, Geophysical Prospecting, 61, 302–314.
    [Google Scholar]
  8. Pimienta, L., J.Fortin, and Y.Guéguen
    , 2015a, Bulk modulus dispersion and attenuation in sandstones, Geophysics, 80(2), D111–D127.
    [Google Scholar]
  9. , 2015b, Young modulus dispersion and attenuation in sandstones, Geophysics, 80(5), L57–L72.
    [Google Scholar]
  10. , 2016a, Effect of fluids and frequencies on Poisson’s ratio of fluid-saturated sandstones, Geophysics, 81(2), D35–D47.
    [Google Scholar]
  11. Pimienta, L., J.V.M.Borgomano, J.Fortin, and Y.Guéguen
    , 2016b, Modelling the drained/undrained transition: Effect of the measuring method and the boundary conditions, Geophysical Prospecting, 64 (4), 1098–1111.
    [Google Scholar]
  12. Pimienta, L., J.Fortin, J.V.M.Borgomano, and Y.Guéguen
    , 2016c, Dispersions & Attenuations in a fully saturated sandstone: Experimental evidence for fluid flows at different scales, The Leading Edge, 35(6), 495–501.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201700570
Loading
/content/papers/10.3997/2214-4609.201700570
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error