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Velocity Dispersion of Stoneley Wave as an Insight into Permeability
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00528
- ISBN: 978-90-73834-27-9
Abstract
Permeability is a key parameter in hydrocarbon exploration and reservoir analysis. Studies indicate that a higher permeability in a porous rock results in greater P-wave velocity dispersion. We utilize full-waveform sonic data to study the relation of permeability and velocity dispersion of Stoneley waves. The sonic datasets were acquired from the Mallik gashydrate research wells in Mackenzie Delta, Northwest Territory, Canada. Velocities of Stoneley wave are measured using semblance analysis on low and high pass components, and the velocity difference is therefore velocity dispersion. Well logs from the same borehole are then investigated to produce cross plots of velocity dispersion, permeability, and porosity. The measurements show positive correlation between velocity dispersion and permeability. It is very common that Stoneley wave is much stronger and easier to identify than P or S wave in borehole sonic surveys. Our effort demonstrates that velocity dispersion of Stoneley wave is a potential indicator of in situ permeability.