The attenuation of seismic waves when traveling through viscous fluid-saturated rocks is generally higher than in dry rocks in most of the freqeuncy bandwidth. Futhermore, changes in the spectral and amplitude characteristics of the seismic signal could be associated with the presence of fluids and fractures.

For that reason laboratory measurements of wave attenuation have been performed on sedimentary rocks at several frequency levels These measurements generally show that lithological factors—such as porosity, permeability, and clay content—are responsible for the wave attenuation.

Some efforts have been made to use the physics of seismic attenuation for reservoir monitoring of an EOR...

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