Frequency dependent seismic wave attenuation and dispersion in fluid saturated rocks - Experimental and numerical simulation results
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Sam Chapman
Laboratoire de Géologie, Ecole Normale Supérieure
- Date & Time
- Location
- Online-only seminar via Microsoft Teams
- Host
- David Lockner
- Summary
The intrinsic attenuation of seismic waves in fluid saturated porous rocks is attributed commonly to fluid pressure diffusion (FPD) at the micro- and mesoscopic scale. FPD arises primarily from contrast in compressibility between different fluid phases or between more and less compliant constituents of the porous material, such as between fractures and the porous matrix. Better understanding the intrinsic attenuation of seismic waves can potentially improve the seismic monitoring of CO2 storage sites or enhanced geothermal operations. Numerical methods have been used to solve Biot’s dynamic and consolidation equations, making it possible to model FPD in response to complex heterogeneities and distributions of the saturating fluids as well as account for the presence of fractures. Validation through laboratory experiments is however lacking, requiring the parameterisation of both the fluid distribution and the structural heterogeneity of the samples, as well as the ability to accurately measure attenuation and dispersion in the seismic frequency range (