Visual observation of gas-hydrate formation and dissociation in synthetic porous media by means of glass micromodels

Bahman Tohidi, Ross Anderson, M. Ben Clennell, Rod W. Burgass, Ali B. Biderkab

Research output: Contribution to journalArticle

230 Citations (Scopus)

Abstract

Visual observation of gas hydrates at the microscopic scale in synthetic porous media provides unequivocal visual evidence that clathrates can form in systems without the presence of a free-gas phase. Hydrates were formed from a soluble liquid hydrate former (tetrahydrofuran, C4H8O), from free gas (CH4), and from dissolved gas (CO2). Clathrates were found to form within the center of pore spaces, rather than on grain surfaces. Cementation of grains only occurred in regions of a small grain size, or where a large proportion of pore space was filled with hydrate. However, even at high clathrate saturations, a thin film of free water persisted on grain surfaces. The results have important implications for the potential cementing effect of hydrates on sediments, and thus for sediment permeability, slope stability, and seismic interpretation of hydrate-bearing sediments.

Original languageEnglish
Pages (from-to)867-870
Number of pages4
JournalGeology
Volume29
Issue number9
DOIs
Publication statusPublished - Sep 2002

Keywords

  • Carbon dioxide
  • Cementation
  • Gas hydrates
  • Methane
  • Porous media
  • Sediments

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