Influence of fluid chemistry on shear-wave attenuation and velocity in sedimentary rocks

Abstract

Measurements of shear-wave attenuation Q,:' and velocity V , were made in a sample of Massilon sandstone and a sample of Brauvilliers oolitic limestone in the kilohertz frequency range using a resonant bar technique. The major structural difference between these two rocks is the presence of grain contact microcracks (thin gaps) in the first and their absence in the second. Measurements were made as a function of fluid saturation S, using a drying technique; the first and second samples were saturated successively with nine and four low-viscosity fluids, respectively, at room pressure and temperature.