Velocities and Attenuations of Gas Hydrate-Bearing Sediments
Monopole and dipole logging data at the Mallik 5L-38, Mackenzie Delta, Canada, provide a challenge for sonic velocity and attenuation models used to remotely estimate pore-space gas hydrate content. Velocity and attenuation are linked, with velocity dispersion causing increased attenuation. Sonic waveforms for Mallik 5L-38, however, show no velocity dispersion in gas hydrate-bearing layers, yet are highly attenuated. Attenuation models applied to Mallik 5L-38 data are shown to be inconsistent with the observed velocity measurements, and therefore are suspect in their ability to predict gas hydrate content. A model explicitly linking velocity and attenuation data is presented, accurately predicting gas hydrate content from velocity data alone while demonstrating that the attenuation mechanisms at the Mallik 5L-38 site have not yet been identified.
Citation Information
Publication Year | 2007 |
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Title | Velocities and Attenuations of Gas Hydrate-Bearing Sediments |
DOI | 10.3133/sir20075264 |
Authors | Myung W. Lee |
Publication Type | Report |
Publication Subtype | USGS Numbered Series |
Series Title | Scientific Investigations Report |
Series Number | 2007-5264 |
Index ID | sir20075264 |
Record Source | USGS Publications Warehouse |
USGS Organization | U.S. Geological Survey |