Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea
Gas hydrates are a potential future energy resource and are widely distributed in marine sediments and permafrost areas. The physical properties and mechanical behavior of gas hydrate-bearing sediments are of great significance to seafloor stability and platform safety. In 2013, a large number of pr...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6636125 |
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| author | Jiangong Wei Tingting Wu Xiuli Feng Jinqiang Liang Wenjing Li Rui Xie Gang Wu |
| author_facet | Jiangong Wei Tingting Wu Xiuli Feng Jinqiang Liang Wenjing Li Rui Xie Gang Wu |
| author_sort | Jiangong Wei |
| collection | DOAJ |
| description | Gas hydrates are a potential future energy resource and are widely distributed in marine sediments and permafrost areas. The physical properties and mechanical behavior of gas hydrate-bearing sediments are of great significance to seafloor stability and platform safety. In 2013, a large number of pressure cores were recovered during China’s second gas hydrate drilling expedition in the South China Sea. In this study, we determined the gas hydrate distribution, saturation, physical properties, and mechanical behavior of the gas hydrate-bearing sediments by conducting Multi-Sensor Core Logger measurements and triaxial and permeability tests. Disseminated gas hydrates, gas hydrate veins, and gas hydrate slabs were observed in the sediments. The gas hydrate distribution and saturation are spatially heterogeneous, with gas hydrate saturations of 0%–55.3%. The peak deviatoric stress of the gas hydrate-bearing sediments is 0.14–1.62 MPa under a 0.15–2.3 MPa effective confining stress. The permeability is 0.006–0.095×10−3 μm2, and it decreases with increasing gas hydrate saturation and burial depth. |
| format | Article |
| id | doaj-art-16c0a5e3c3084ef4b5f3fd493dbdbc64 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-16c0a5e3c3084ef4b5f3fd493dbdbc642025-08-20T03:54:32ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66361256636125Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China SeaJiangong Wei0Tingting Wu1Xiuli Feng2Jinqiang Liang3Wenjing Li4Rui Xie5Gang Wu6Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, ChinaKey Laboratory of Submarine Geosciences and Prospecting Techniques, MOE; College of Marine Geosciences, Ocean University of China, Qingdao 266100, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, ChinaMLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, ChinaMLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, ChinaMLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, ChinaGas hydrates are a potential future energy resource and are widely distributed in marine sediments and permafrost areas. The physical properties and mechanical behavior of gas hydrate-bearing sediments are of great significance to seafloor stability and platform safety. In 2013, a large number of pressure cores were recovered during China’s second gas hydrate drilling expedition in the South China Sea. In this study, we determined the gas hydrate distribution, saturation, physical properties, and mechanical behavior of the gas hydrate-bearing sediments by conducting Multi-Sensor Core Logger measurements and triaxial and permeability tests. Disseminated gas hydrates, gas hydrate veins, and gas hydrate slabs were observed in the sediments. The gas hydrate distribution and saturation are spatially heterogeneous, with gas hydrate saturations of 0%–55.3%. The peak deviatoric stress of the gas hydrate-bearing sediments is 0.14–1.62 MPa under a 0.15–2.3 MPa effective confining stress. The permeability is 0.006–0.095×10−3 μm2, and it decreases with increasing gas hydrate saturation and burial depth.http://dx.doi.org/10.1155/2021/6636125 |
| spellingShingle | Jiangong Wei Tingting Wu Xiuli Feng Jinqiang Liang Wenjing Li Rui Xie Gang Wu Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea Geofluids |
| title | Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea |
| title_full | Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea |
| title_fullStr | Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea |
| title_full_unstemmed | Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea |
| title_short | Physical Properties of Gas Hydrate-Bearing Pressure Core Sediments in the South China Sea |
| title_sort | physical properties of gas hydrate bearing pressure core sediments in the south china sea |
| url | http://dx.doi.org/10.1155/2021/6636125 |
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