Self-consistent and squirt flow modelling of velocity dispersion and attenuation for effective-stress dependent experimental data

ABSTRACT

We evaluate acoustic scattering and Wave Induced Fluid Flow (WIFF) mechanisms as a source of velocity dispersion in experimental compressional P- and shear S- waves. The latter was carried out by implementing the Self Consistent (SC) approach and the Chapmańs squirt flow model over a data set consisting of frequency- and pressure dependent velocities obtained by Sothcott, McCann, and O'Hara (2000, The influence of two different pore fluids on the acoustic properties of reservoir sandstones at sonic and ultrasonic frequencies. 70th SEG Meeting, Expanded Abstracts, 1883–1886) on brine saturated Clashach sandstones. Modelled velocities are further used to estimate attenuation values for both P- and S- waves. Error estimation between experimental data and theoretical modelling suggest that WIFF is the main mechanism in defining dispersion and attenuation on the studied samples.

KEYWORDS:

• Attenuation
• modelling
• rock physics

Acknowledgments

Authors thank to IMP (Instituto Mexicano del Petróleo) for giving permission to publish this work.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Jaime Meléndez-Martínez http://orcid.org/0000-0002-5845-4289