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Anisotropic Frequency-dependent Characteristics of P-SV-waves in Periodically Layered Porous MediaNormal access

Authors: X. Qin, X.Y. Li, H. Dai and Z. Cao
Event name: 80th EAGE Conference and Exhibition 2018
Session: Rock Physics III - Pore Fluids and Anisotropy
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801026
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.51Mb )
Price: € 20

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.

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