Controls on the physical properties of gas-hydrate-bearing sediments because of the interaction between gas hydrate and porous media
Scientific Investigations Report
2005-5143
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Abstract
Physical properties of gas-hydrate-bearing sediments depend on the pore-scale interaction between gas hydrate and porous media as well as the amount of gas hydrate present. Well log measurements such as proton nuclear magnetic resonance (NMR) relaxation and electromagnetic propagation tool (EPT) techniques depend primarily on the bulk volume of gas hydrate in the pore space irrespective of the pore-scale interaction. However, elastic velocities or permeability depend on how gas hydrate is distributed in the pore space as well as the amount of gas hydrate. Gas-hydrate saturations estimated from NMR and EPT measurements are free of adjustable parameters; thus, the estimations are unbiased estimates of gas hydrate if the measurement is accurate. However, the amount of gas hydrate estimated from elastic velocities or electrical resistivities depends on many adjustable parameters and models related to the interaction of gas hydrate and porous media, so these estimates are model dependent and biased. NMR, EPT, elastic-wave velocity, electrical resistivity, and permeability measurements acquired in the Mallik 5L-38 well in the Mackenzie Delta, Canada, show that all of the well log evaluation techniques considered provide comparable gas-hydrate saturations in clean (low shale content) sandstone intervals with high gas-hydrate saturations. However, in shaly intervals, estimates from log measurement depending on the pore-scale interaction between gas hydrate and host sediments are higher than those estimates from measurements depending on the bulk volume of gas hydrate.
Suggested Citation
Lee, M.W., and Collett, T.S., 2005, Controls on the physical properties of gas-hydrate-bearing sediments because of the interaction between gas hydrate and porous media (Online only, Version 1.0): U.S. Geological Survey Scientific Investigations Report 2005-5143, 20 p., https://doi.org/10.3133/sir20055143.
ISSN: 2328-0328 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Controls on the physical properties of gas-hydrate-bearing sediments because of the interaction between gas hydrate and porous media |
| Series title | Scientific Investigations Report |
| Series number | 2005-5143 |
| DOI | 10.3133/sir20055143 |
| Edition | Online only, Version 1.0 |
| Year Published | 2005 |
| Language | ENGLISH |
| Description | 20 p. |
| Scale | 100000 |
| Online Only (Y/N) | Y |