NMR measurement and analysis of porosity and permeability for hydrate-bearing sediments

Takeshi Komai, Yasuhide Sakamoto, Yoshito Nakashima, Naoya Takahara, Hideki Minagawa, Norio Tenma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In-situ observation of gas hydrate formation and dissociation in hydrate-bearing sediments, and water-permeability measurements for the sediments have been performed by the apparatus combined proton nuclear magnetic resonance (1H NMR) and permeability measurement system, which we had originally designed. As a result of NMR measurement and analysis, it was found that hydrate growth make apparent pore size gradually smaller. On the other hand, hydrate dissociation is supposed to advance from water-hydrate interfaces, where apparent pore size becomes larger gradually. All the sediments used here have the same tendency of decreasing pore-size with changing water saturation due to hydrate formation and growth. NMR measurement for gas hydrate sediments has a great possibility in understanding the structure of pore spaces and the change in porosity and permeability during exploration and production stages.

Original languageEnglish
Title of host publicationProceedings of the 8th 2009 ISOPE Ocean Mining and Gas Hydrates Symposium, ISOPE OMS-2009
Pages107-112
Number of pages6
Publication statusPublished - 2009 Dec 1
Externally publishedYes
Event8th 2009 ISOPE Ocean Mining and Gas Hydrates Symposium, ISOPE OMS-2009 - Chennai, India
Duration: 2009 Sep 202009 Sep 24

Other

Other8th 2009 ISOPE Ocean Mining and Gas Hydrates Symposium, ISOPE OMS-2009
Country/TerritoryIndia
CityChennai
Period09/9/2009/9/24

Keywords

  • Formation and dissociation
  • Gas hydrates
  • NMR
  • Permeability
  • Porosity
  • Sediment

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Ocean Engineering

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