| Abstract: | Elastic velocities and hydraulic permeability of gas hydrate-bearing sediments strongly depend on how gas hydrate accumulates in pore spaces and various gas hydrate accumulation models are proposed to predict physical property changes due to gas hydrate concentrations. Elastic velocities and permeability predicted from a cementation model differ noticeably from those from a pore-filling model. A nuclear magnetic resonance (NMR) log provides in-situ water-filled porosity and hydraulic permeability of gas hydrate-bearing sediments. To test the two competing models, the NMR log along with conventional logs such as velocity and resistivity logs acquired at the Mallik 5L-38 well, Mackenzie Delta, Canada, were analyzed. When the clay content is less than about 12 percent, the NMR porosity is ‘accurate‘ and the gas hydrate concentrations from the NMR log are comparable to those estimated from an electrical resistivity log. The variation of elastic velocities and relative permeability with respect to the gas hydrate concentration indicates that the dominant effect of gas hydrate in the pore space is the pore-filling characteristic. |
| Genre: | USGS Numbered Series |
| ProdID: | 97128 |
| Citation Author: | Lee, Myung W. |
| Citation Contributing Office: | Central Energy Resources Team |
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| Citation Edition: | Version 1.0 |
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| Citation Language: | ENGLISH |
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| Citation No Pagination: | N |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | iii, 15 p. |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Report |
| Citation Series Code: | SIR |
| Citation Series Number: | 2008-5219 |
| Citation Search Results Text: | Models for Gas Hydrate-Bearing Sediments Inferred from Hydraulic Permeability and Elastic Velocities; 2008; SIR; 2008-5219; Lee, Myung W. |
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| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Models for Gas Hydrate-Bearing Sediments Inferred from Hydraulic Permeability and Elastic Velocities; 2008; SIR; 2008-5219; Lee, Myung W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sir/2008/5219/ |
| Date Other: | Thu, 18 Dec 2008 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
