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Anisotropic Frequency-dependent Characteristics of P-SV-waves in Periodically Layered Porous Media
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Periodically layered porous media have been widely used in studying velocity dispersion and attenuation. In this paper, we have developed a model for studying the anisotropic frequency-dependent characteristics of P and SV waves in periodically layered porous media. Firstly, we use a double porosity model to obtain the P wave modulus with a normally-incident P-wave. Then we extend the incidence to any propagation angle by an elastic upscaling method. Finally, we use a numerical example to investigate the effect of incident angles and fluid saturation. The numerical results show that velocity dispersion and attenuation of P-waves appears at any incident angle, while for the SV-wave they occur only in a narrow range of incidence angles from 30o to 60o. The maximum of peak attenuation of the P-wave and SV-wave occurs at different gas saturations, 0.1 and 0.4, respectively.