New rock physical models describing the pressure dependence of seismic/acoustic dispersion characteristics

Marashly, Omar Al and Turainé Vurom, Brigitta and Kiss, Anett and Dobróka, Mihály and Szabó, Norbert Péter (2023) New rock physical models describing the pressure dependence of seismic/acoustic dispersion characteristics. In: 84 th EAGE Annual Conference & Exhibition.

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Abstract

In this paper, new rock physical models describing the pressure dependence of acoustic wave velocities and quality factors are presented. They are based on the consideration that the cause of changing velocities/quality factors under varying pressure is due to the changes in pore volume. After determining the model parameters by jointly inverting P and S wave velocity/quality factor data, they can be calculated for any pressure. Based on these results the pressure-dependent Lamé parameters and loss angles can be derived as well. To prove the applicability of the methods, literature data (velocities and quality factors) measured on coal samples were inverted. The results show that the misfits between measured and calculated data are small, and the model can be applied well in practice.

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