Physics – Geophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3210609y&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 10, CiteID L10609
Physics
Geophysics
13
Exploration Geophysics: Seismic Methods (3025, 7294), Marine Geology And Geophysics: Gas And Hydrate Systems, Physical Properties Of Rocks: Acoustic Properties
Scientific paper
The competing hypotheses for gas hydrate formation at the particle scale in sediments describe processes of pore-filling, frame-building, or cementation. New measurements of compressional (VP) and shear wave (VS) velocities in fine-grained sands subjected to low confinement and monitored during formation of tetrahydrofuran hydrate indicate that hydrate nucleates in the pore space (presumably at grain boundaries) and grows with limited impact on the sediment shear stiffness, VP, and VS until crystals begin to interact with the granular skeleton at ~40% hydrate concentration. VS increases significantly more than VP at higher hydrate concentrations, reflecting larger changes in the specimen's shear stiffness than its bulk stiffness. The results indicate that seismic velocities and/or their ratio (VP/VS) have limited capability for locating hydrate or constraining hydrate concentrations.
Francisca F. M.
Ruppel Carolyn
Santamarina Carlos J.
Yun T. S.
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