New method of assessing absolute permeability of natural methane hydrate sediments by microfocus X-ray computed tomography

被引：32

作者：

Jin, Yusuke ^{[1
]}

Hayashi, Junko ^{[1
]}

Nagao, Jiro ^{[1
]}

Suzuki, Kiyofumi ^{[1
]}

Minagawa, Hideki ^{[1
]}

Ebinuma, Takao ^{[1
]}

Narita, Hideo ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Methane Hydrate Res Lab, Sapporo, Hokkaido 0628517, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2007年 / 46卷 / 5A期

关键词：

permeability; X-ray computed tomography; pore network; natural gas hydrate sediment;

D O I：

10.1143/JJAP.46.3159

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页码：3159 / 3162

页数：4