New Method of Assessing Absolute Permeability of Natural Methane Hydrate Sediments by Microfocus X-ray Computed Tomography
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概要
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The structure of natural-gas hydrate sediments was studied using a microfocus X-ray computed-tomography (CT) system. The free-gas spaces, sand particles, and hydrates or ices were identified from the obtained three-dimensional (3-D) images. We used CT data to analyze a continuous pore, which allows gas and water flow. The absolute permeability of sediment samples correlated well with horizontal-channel density in terms of direction. The grain-size distribution in sediment samples depended on the spread of flow channels. The average area and length of a channel evidently have little effect on absolute permeability. We determined that absolute permeability increased with the ratio of horizontal- to vertical-channel numbers. It was clear that the number ratio of the horizontal to vertical channels is a predominant factor that determines absolute permeability in similar porosity ranges. These results indicate that the pore network in sediments can be useful for assessing permeability.
- 2007-05-15
著者
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NAGAO Jiro
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technolog
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JIN Yusuke
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technolog
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EBINUMA Takao
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technolog
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Narita Hideo
Methane Hydrate Research Laboratory National Institute Of Advanced Industrial Science And Technology
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Hayashi Junko
Methane Hydrate Research Laboratory National Institute Of Advanced Industrial Science And Technology
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Nagao Jiro
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Sapporo 062-8517, Japan
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Suzuki Kiyofumi
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Sapporo 062-8517, Japan
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Minagawa Hideki
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Sapporo 062-8517, Japan
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Ebinuma Takao
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Sapporo 062-8517, Japan
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Hayashi Junko
Methane Hydrate Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Sapporo 062-8517, Japan
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Jin Yusuke
Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
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Nagao Jiro
Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
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- New Method of Assessing Absolute Permeability of Natural Methane Hydrate Sediments by Microfocus X-ray Computed Tomography
- Structural Investigation of Methane Hydrate Sediments by Microfocus X-ray Computed Tomography Technique under High-Pressure Conditions
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