In this paper new rock physical model describing the hysteretic pressure dependence of acoustic wave velocities is presented. The model is able to consider two or more physical mechanisms responsible for the pressure dependence of the propagation characteristics (for example the closing/opening of microcracks and the change of pore volume by virtue of the change in the rock pressure). Our rock physical model was successfully used as forward modelling equations in the inversion of longitudinal velocity data measured on core samples originated from oil drilling wells and also seismic/acoustic velocity data sets published in the literature.


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