Velocity Dispersion And Attenuation In Brazilian Sandstones

It is well known that attenuation data should<br>be a very powerful tool to rock and fluid type determination.<br>Attenuation properties are sensitive to rock<br>and fluid type, partial saturation, presence of cracks<br>and other parameters which are difficult to obtin by<br>the conventional seismic method. Nevertheless, seismic<br>wave attenuation studies are very rare compared<br>to seismic wave velocities and its relationships to<br>rock properties, in part due to the theoretical and<br>experimental difficulties involved. Laboratory measurements<br>of attenuation under well-controlled conditions<br>are useful to gain qualitative insights on the<br>wave propagation process and its relationships with<br>rock and fluid properties. In this paper we present<br>some results on the study of seismic attenuation of<br>Brazilian rocks.