Velocities and Attenuations of Gas Hydrate-Bearing Sediments
Scientific Investigations Report
2007-5264
By: Myung W. Lee
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Abstract
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.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Velocities and Attenuations of Gas Hydrate-Bearing Sediments |
| Series title | Scientific Investigations Report |
| Series number | 2007-5264 |
| DOI | 10.3133/sir20075264 |
| Edition | Version 1.0 |
| Year Published | 2007 |
| Language | ENGLISH |
| Publisher | Geological Survey (U.S.) |
| Contributing office(s) | U.S. Geological Survey |
| Description | iv, 11 p. |
| Online Only (Y/N) | Y |
| Google Analytic Metrics | Metrics page |