Full text loading...
-
Seismic Attenuation in Fontainebleau Sandstone Saturated with High-viscosity Fluids
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Attenuation, corresponding to the anelastic loss caused by viscous dissipation in a rock, has been measured in the laboratory over the seismic frequency range (1–100 Hz) in a Fontainebleau sandstone sample at confining pressures of 5, 10 and 15 MPa. The sample has been completely saturated with liquids of viscosities varying from 1 cP (water) to 1414 cP (glycerine), the intermediate viscosities being obtained from a water-glycerine mixture. By increasing fluid viscosity, it has been observed that the magnitude of attenuation increases and its peak is shifted to lower frequencies. Moreover, the overall magnitude of the different attenuation curves decreases with increasing confining pressure. These results suggest that attenuation is dominated by a fluid flow mechanism, possibly, squirt flow.