Abstract
This paper presents the results of experiments on the effect of variable amplitude and pressure on the P-wave velocity and attenuation in cemented sandstone sample. The measurements were performed in transmitted waves at a predominant pulse frequency of 6.8 kHz in the range of strain amplitudes A ε ≈ (0.2−2.4) × 10 −6 at an axial static pressure of 0.25 MPa to 1.0 MPa. The wave velocity depends weakly on the amplitude and decreases only slightly with its increase. With increasing pressure the velocity V e nonlinearly increases (to 6%) at all amplitudes. The attenuation Q e −1 increases linearly (to 2.5%) with increasing amplitude and decreases nonlinearly with increasing pressure. There is an anomalous change in the attenuation in the pressure range (0.5–0.75) MPa, where it decreases to 30% at all amplitudes. These results may be useful for improving acoustic and seismic methods of diagnostics.
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