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Poster communications

Finding appropriate rocks physics models to interpret seismic data in hydrogeophysics applications

Abstract : Seismic methods have been recently applied to the monitoring of spatial and temporal variations of near surface characteristics for hydrogeological purposes. The seismic signal is certainly related to mechanical properties that partly depend on porosity and saturation. The behavior of pressure (P) and shear (S) waves in the presence of water is partially decoupled, and the ratio of their propagation velocities VP/VS has been used to study water saturation changes. However, the interpretation of the mechanical properties remains complex in unconsolidated near surface materials, limiting the quantitative description of linked hydrodynamic properties. In this study, we investigate the theories behind wave propagation velocities in poorly consolidated media and how they are affected by water content, focusing our discussion on the partially saturated response. We present a field case where we used a Hertz-Mindlin based rock physics model to estimate water saturation from VP and VS from seismic data. The model is able to distinguish between dry and fully saturated areas at two distinct hydrological periods, but fails in identifying partially saturated areas in both cases. This work underlines the need for more elaborated models to infer hydrodynamic properties from seismic data.
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Poster communications
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https://hal-insu.archives-ouvertes.fr/insu-01927855
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, November 20, 2018 - 10:48:50 AM
Last modification on : Wednesday, November 4, 2020 - 7:14:03 PM

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  • HAL Id : insu-01927855, version 1

Citation

Lara Antonia Blazevic, Ludovic Bodet, Damien Jougnot, Laurent Longuevergne. Finding appropriate rocks physics models to interpret seismic data in hydrogeophysics applications. American Geophysical Union 2018, Fall Meeting, Dec 2018, Washington, United States. pp.H11I-1575, 2018. ⟨insu-01927855⟩

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