On the use of observations of acoustic emission for recovery of structural characteristics of rocks
Category: 16-4UDC 539.2
V.T. Belikov, D.G. Ryvkin
Institute of Geophysics, the Ural Branch of RAS, Yekaterinburg, Russia
Abstract. A quantitative physical model describing the acoustic emission is proposed. The relations between the parameters of acoustic radiation and structural-petrophysical properties of rocks have been obtained. An algorithm is developed to solve the inverse problem of detection of structural and petrophysical characteristics of the medium with the use of the amplitude-frequency spectrum of acoustic emission. The proposed algorithm is used for quantitative interpretation of the results during the observations of dry gas and gas-liquid mixture filtration in rock samples. As a result, the distribution function of the characteristic size of fractured porous space and the corresponding distribution of the relative values of porosity and specific inner surface were calculated. The interpretation of observational data of acoustic emission during gas-liquid mixture filtration allowed us to recover the distribution function of the characteristic size of the liquid phase. It is shown that broadening of the amplitude-frequency spectrum of acoustic emission near maximum amplitudes observed in gas-liquid mixture filtering, correlates with the appearance of additional emitters – droplets of liquid suspended in gas in this size range.
Keywords: acoustic emission, rock, porosity, specific internal surface.
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