Home – Home – Jornals – Russian Geology and Geophysics 2006 number 3

The reported laboratory experiments of cycling measurements investigate strain-amplitude dependence of compressional velocity and attenuation of acoustic waves ( f ~ 1 MHz) in samples of the Nivagal sandstone. Strain-amplitude growth in a range of ε_d ~ (0,3-2) · 10^-6 causes a 0.6% velocity increase and an up to 10% decrease in attenuation. Attenuation curves show a minor hysteresis in a full cycle (A_min → A_max → A_min). Amplitude dependence of velocity and attenuation can be better resolved at higher strains. Attenuation is more sensitive to strain variations than velocity. The revealed relationships are useful as an additional criterion in imaging sandstone formations.