天然堆積物中でのメタンハイドレート形成における堆積物粒子径, 粘土鉱物等の影響 Investigations of Particle Size and Clay Mineral Effect on Gas Hydrate Formation in Natural Sediment

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 Accurately estimating natural gas hydrate resources is one of the most important issues when assessing the energy potential of natural gas hydrate, which relies largely on the precision of data on the hydrate saturation level in sediments of a reservoir.<br> The primary mode of occurrence of gas hydrate recognized in the eastern Nankai Trough area is in sediment pores. It is suggested that the distribution of coarse-grained sands is one of the most important factors controlling the occurrence of natural gas hydrates. This research aims to elucidate the particle size and clay mineral effects on hydrate saturation in sediments through an experimental approach.<br> The specimens tested include sand, silty sand, and silt, representing the main sediment types recovered from the gas hydrate distribution region of the eastern Nankai Trough. The results obtained from the experiments clearly indicate a particle size and clay content-dependent trend of low saturation in fine sediment but high saturation in coarse sediment. These results are generally consistent with NMR logging results for high-saturation samples, but are somewhat different for samples with low or medium saturation levels. To obtain a better understanding of the mechanism of these two factors, studies were carried out to investigate the saturation level of methane hydrate in a series of silica powders and clay. The results indicate that particle size and clay contents are the two key factors determining the saturation level of gas hydrate in sediments—the finer the particle size and/or the higher the clay content, the lower the hydrate saturation.

収録刊行物

  • 地學雜誌

    地學雜誌 118(5), 872-882, 2009-10-25

    Tokyo Geographical Society

参考文献:  21件中 1-21件 を表示

被引用文献:  3件中 1-3件 を表示

各種コード

  • NII論文ID(NAID)
    10030366529
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10503712
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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