The pressure dependence of quality factor of acoustic waves is an extensively explored rock physical problem. To reasonably evaluate and interpret laboratory measurements, a quantitative model of the mechanism of pressure dependence of quality factor is needed. A new petrophysical model based on simple physical assumptions was developed which describes the relationship between quality factor and pressure as well as acoustic velocity and pressure. The model is based on the idea that microcracks are opened and closed besides different pressure states. The model was applied on quality factor and acoustic velocity data set measured by Prasad and Manghnani or rather Yu et al. The material parameters of the models are determined by using joint inversion method and the laboratory measurements were compared to the theoretical data. The theoretical data matched accurately with measured data proving that the petrophysical model applies well in practice. Studying this phenomenon is relevant because we can infer to the changes in rock pressure by right of seismic/acoustic measurements.


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