Unknown
NRC Research Press
In:
Canadian Journal of Physics, 81 (1-2). pp. 373-380.
Publication Date:
2018-04-11
Description:
Abstract: Compressional creep tests (i.e., constant applied stress) conducted on pure,
polycrystalline methane hydrate over the temperature range 260–287 K and confining
pressures of 50–100 MPa show this material to be extraordinarily strong compared to
other icy compounds. The contrast with hexagonal water ice, sometimes used as a proxy
for gas hydrate properties, is impressive: over the thermal range where both are solid,
methane hydrate is as much as 40 times stronger than ice at a given strain rate. The specific
mechanical response of naturally occurring methane hydrate in sediments to environmental
changes is expected to be dependent on the distribution of the hydrate phase within the
formation — whether arranged structurally between and (or) cementing sediment grains
versus passively in pore space within a sediment framework. If hydrate is in the former
mode, the very high strength of methane hydrate implies a significantly greater strain-energy
release upon decomposition and subsequent failure of hydrate-cemented formations than
previously expected.
Type:
Article
,
PeerReviewed
Format:
text
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