Physical properties of hydrate‐bearing sediments

Reviews of Geophysics - Tập 47 Số 4 - 2009
William F. Waite1, J. Carlos Santamarina2, Douglas D. Cortes2, Brandon Dugan3, D. Nicolás Espinoza2, John T. Germaine4, Jaewon Jang2, Jongwon Jung2, Timothy J. Kneafsey5, Hosung Shin2, Kenichi Soga6, William J. Winters1, Tae Sup Yun7
1U.S. Geological Survey Woods Hole Massachusetts USA
2School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia USA
3Department of Earth Science Rice University Houston Texas USA
4Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
5Lawrence Berkeley National Laboratory, Berkeley, California USA
6Department of Engineering, University of Cambridge, Cambridge, UK
7School of Civil and Environmental Engineering, Yonsei University, Seoul, South Korea

Tóm tắt

Methane gas hydrates, crystalline inclusion compounds formed from methane and water, are found in marine continental margin and permafrost sediments worldwide. This article reviews the current understanding of phenomena involved in gas hydrate formation and the physical properties of hydrate‐bearing sediments. Formation phenomena include pore‐scale habit, solubility, spatial variability, and host sediment aggregate properties. Physical properties include thermal properties, permeability, electrical conductivity and permittivity, small‐strain elastic P and S wave velocities, shear strength, and volume changes resulting from hydrate dissociation. The magnitudes and interdependencies of these properties are critically important for predicting and quantifying macroscale responses of hydrate‐bearing sediments to changes in mechanical, thermal, or chemical boundary conditions. These predictions are vital for mitigating borehole, local, and regional slope stability hazards; optimizing recovery techniques for extracting methane from hydrate‐bearing sediments or sequestering carbon dioxide in gas hydrate; and evaluating the role of gas hydrate in the global carbon cycle.

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