Open AccessAMPLITUDE-DEPENDENT SPECTRA OF THE DAMPING OF A LONGITUDINAL WAVE IN DRY AND WATER-SATURATED SANDSTONE AT HYDROSTATIC PRESSURE
Author(s) -
Э. И. Машинский
Publication year - 2018
Publication title -
geofizičeskie tehnologii
Language(s) - English
Resource type - Journals
ISSN - 2619-1563
DOI - 10.18303/2619-1563-2018-1-3
Subject(s) - attenuation , amplitude , impulse (physics) , spectral line , overburden pressure , waveform , anelastic attenuation factor , hydrostatic pressure , mineralogy , geology , mechanics , optics , geotechnical engineering , physics , classical mechanics , quantum mechanics , astronomy , voltage
Data of experimental study of amplitude dependence of P-wave attenuation in the dry and watersaturatedsandstone under confining pressure of 10 MPa are presented. Measurements were conducted on samples using the reflection method at a dominant frequency of the initial impulse of 1 MHz in the amplitude range ~ (0,3 – 2,0) 10-6. P-wave attenuation spectra, 1( , ) P Q f in the frequency range of 0,52 – 1,42 MHz in a dry and saturated sample have an appearance in the form of relaxation peak which depends on the strain amplitude. In the saturated sandstone, attenuation is greater and the attenuation peak is shifted to higher frequencies compared to the dry sandstone. With increasing amplitude, wave attenuation decreases in dry sandstone by 4,5% and in saturated – by 9%. P-wave velocity practically doesn't depend on the strain amplitude. The possible mechanism of discrete (intermittent) inelasticity which determines the waveform distortion and exerts influence on wave attenuation spectra is discussed. The received results have fundamental and applied importance for seismics, acoustics and in Earth sciences.