Compressional and shear wave velocities in uncemented sediment containing gas hydrate

Tae Sup Yun; F. M. Francisca; J. Carlos Santamarina; C. Ruppel

doi:10.1029/2005GL022607

Compressional and shear wave velocities in uncemented sediment containing gas hydrate

Tae Sup Yun^*, F. M. Francisca, J. Carlos Santamarina, C. Ruppel

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

226 Scopus citations

Abstract

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 (V_P) and shear wave (V_S) 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, V_P, and V_S until crystals begin to interact with the granular skeleton at ∼40% hydrate concentration. V_S increases significantly more than V_P 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 (V_P/V_S) have limited capability for locating hydrate or constraining hydrate concentrations.

Original language	English (US)
Pages (from-to)	1-5
Number of pages	5
Journal	Geophysical Research Letters
Volume	32
Issue number	10
DOIs	https://doi.org/10.1029/2005GL022607
State	Published - May 28 2005
Externally published	Yes

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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title = "Compressional and shear wave velocities in uncemented sediment containing gas hydrate",

abstract = "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.",

author = "Yun, {Tae Sup} and Francisca, {F. M.} and Santamarina, {J. Carlos} and C. Ruppel",

year = "2005",

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T1 - Compressional and shear wave velocities in uncemented sediment containing gas hydrate

AU - Yun, Tae Sup

AU - Francisca, F. M.

AU - Santamarina, J. Carlos

AU - Ruppel, C.

PY - 2005/5/28

Y1 - 2005/5/28

N2 - 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.

AB - 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.

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DO - 10.1029/2005GL022607

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

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ER -

Compressional and shear wave velocities in uncemented sediment containing gas hydrate

Abstract

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