Variants of the strain-amplitude dependence of elastic wave velocities in rocks under pressure

Машинский, Э. И.

doi:10.1088/1742-2132/1/4/008

Cited by 28 publications

(21 citation statements)

References 23 publications

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“…The presence of local inelasticity (in particular, rock microplasticity) offers a reasonable explanation of an unusual increase in wave velocity and decrease in attenuation with increasing amplitude detected in some experiments (Johnston and Toksoz ; Mashinskii, Koksharov, and Nefedkin ; Mashinskii ; Mashinskii , , 2012a; Zaitsev, Nazarov, and Talanov ). The microplasticity mechanism does not refute the well‐known mechanisms but expands availability of traditional models that show the opposite situation with amplitude dependence of seismic parameters: The wave velocity decreases, and the attenuation increases with increasing amplitude (Mavko ; Winkler, Nur, and Gladwin ; Tutuncu, Podio, and Sharma ; Ostrovsky and Johnston ).…”

Section: Introductionmentioning

confidence: 63%

Dynamic microplasticity manifestation in consolidated sandstone in the acoustical frequency range

Машинский

2016

Geophysical Prospecting

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A B S T R A C TMicroplasticity manifestations caused by acoustic wave in the frequency range of about 4.5 kHz-7.0 kHz are detected in consolidated artificial sandstone. Equipment was tested by means of comparison of data obtained for a standard material (aluminium) and sandstone. Microplasticity manifestations in acoustic records are present in the form of ladder-like changes in the amplitude course. The stress plateaus in the acoustic trace interrupt the amplitude course, transform the wavefront, and shift the arrival time along the time axis. Microplasticity contribution to the acoustic record changes with the increase in the strain amplitude value. The combined elastic-microplastic process conditions the wavefront steepness and its duration. Stress plateaus exert influence on the waveform and, accordingly, on pulse frequency response. These results confirm the earlier data obtained for weakly consolidated rock. This contribution to wave propagation physics can be useful in solving applied problems in material science, seismic prospecting, diagnostics, etc.

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Section: Introductionmentioning

confidence: 63%

Dynamic microplasticity manifestation in consolidated sandstone in the acoustical frequency range

Машинский

2016

Geophysical Prospecting

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“…Usual data show decrease of wave velocity, the increase of attenuation with increasing amplitude (Mavko, 1979;Ostrovsky and Johnson, 2001;Tutuncu et al, 1994;Winkler et al, 1979). Other data show unusual increase of wave velocity and the decrease in attenuation (Johnston and Toksoz, 1980;Mashinskii, 2004;Mashinskii, 2007a;Zaitsev et al, 1999). Indirect evidence for unusual behavior of elastic modulus is obtained in works (Mashinskii, 2005b;Mashinsky, 1994).…”

Section: Introductionmentioning

confidence: 95%

“…Wave velocity increase with increasing amplitude has been revealed in dolomites (Mashinskii, 2004;Mashinskii and D'yakov, 1999). This result was also confirmed by observations in situ Zaitsev et al, 1999).…”

Section: Introductionmentioning

confidence: 98%

Microplasticity effect in low-velocity zone induced by seismic wave

Машинский

2012

Journal of Applied Geophysics

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“…Limited experimental studies carried out on this effect on velocity dependence on strain provide ambiguous results. Winkler and Nur, (1982) show that the velocity of the waves decreases with the increase of the strain, however Mashinskii (1994Mashinskii ( , 2004Mashinskii ( and 2005 observed increasing of wave velocity with wave amplitude and related that phenomena to microplastic effects in elastic modulus. In both mentioned works the strain amplitude has been estimated and not directly measured.…”

Section: Introductionmentioning

confidence: 99%

Effect of Amplitude on Wave Propagation

Nourifard

Lebedev

2018

ASEG Extended Abstracts

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SUMMARYIt is common to use ultrasonic techniques to measure elastic properties of the porous media. However, conventional methods are unable to measure local strain in ultrasonic wave. This is not clear how the velocity of wave depends on its amplitude. In this work we, 1) measured the particle displacement in the ultrasonic wave using a Laser Doppler Interferometry (LDI) and 2) measured changes of Pwave velocities with wave amplitude for elastic (Aluminium), viscoelastic (Polymethylmethacrylate), and granular media (dried Gosford sandstone). We checked this phenomena using a conventional ultrasonic receiver and linked this changes to a local strain in wave. The study indicated that for a sandstone sample by increasing of local strain produced by an ultrasonic wave from 7*10 -6 to 2*10 -5 the P wave velocity increase by 0.7%. We also analysed the accuracy of velocity measured using LDI as a receiver and compare the results with that using conventional transducers. Moreover, the effect of proper couplant of the sample and the transducer was investigated in details.

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Variants of the strain-amplitude dependence of elastic wave velocities in rocks under pressure

Cited by 28 publications

References 23 publications

Dynamic microplasticity manifestation in consolidated sandstone in the acoustical frequency range

Dynamic microplasticity manifestation in consolidated sandstone in the acoustical frequency range

Microplasticity effect in low-velocity zone induced by seismic wave

Effect of Amplitude on Wave Propagation

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