Compressional and shear wave velocities in uncemented sediment containing gas hydrate

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

Research output: Contribution to journalArticle

151 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalGeophysical Research Letters
Volume32
Issue number10
DOIs
Publication statusPublished - 2005 May 28

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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