| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 80733 |
| Citation Author: | Lee, Myung W. |
| Citation Contributing Office: | Geological Survey (U.S.) |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iv, 11 p. |
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| Citation Publisher: | Geological Survey (U.S.) |
| Citation Series: | Scientific Investigations Report |
| Citation Series Code: | SIR |
| Citation Series Number: | 2007-5264 |
| Citation Search Results Text: | Velocities and Attenuations of Gas Hydrate-Bearing Sediments; 2007; SIR; 2007-5264; Lee, Myung W. |
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| Citation Year: | 2007 |
| Type: | citation/reference |
| Text: | Velocities and Attenuations of Gas Hydrate-Bearing Sediments; 2007; SIR; 2007-5264; Lee, Myung W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/sir_2007_5264.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sir/2007/5264/ |
| Date Other: | Fri, 21 Dec 2007 00:00 -0600 |
| Publisher: | Geological Survey (U.S.) |
