| Genetic model of the hydrate system in the fine grain sediments in the northern continental slope of South China Sea | |
| Wu Shi-Guo1; Dong Dong-Dong1; Yang Sheng-Xiong2; Zhang Guang-Xue2; Wang Zhi-Jun3; Li Qing-Ping3; Liang Jin-Qiang2; Gong Yue-Hua2; Sun Yun-Bao1,4 | |
| 2009-07-01 | |
| 发表期刊 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| ISSN | 0001-5733 |
| 卷号 | 52期号:7页码:1849-1857 |
| 文章类型 | Article |
| 摘要 | Gas hydrate samples were obtained firstly in China by drilling on the northern margin of South China Sea (SCS). To understand the formation mechanism of this unique accumulation system, this paper discusses the factors controlling the formation of the system by accurate geophysical interpretation and geological analysis, based on the high precision 2-D and 3-D multichannel seismic data in the drilling area. There are three key factors controlling the accumulation of the gas hydrate system in fine grain sediment: (1) large volume of fluid bearing methane gas Joins the formation of gas hydrate. Active fluid flow in the northern South China Sea makes both thermal gas and/or biogenic gas migrate into shallow strata and form hydrate in the gas hydrate stability zone (GHSZ). The fluid flow includes mud diapir and gas chimney structure. They are commonly characterized by positive topographic relief, acoustic turbidity and push-down, and low reflection intensity on seismic profiles. The gas chimneys can reach to GHSZ, which favors the development of BSRs. It means that the active fluid flow has a close relationship with the formation and accumulation of gas hydrate. (2) The episodic process of fracture plays an important role in the generation of gas hydrate. It may provide the passage along which thermogenic or biogenic gas migrated into gas hydrate stability zone (GHSZ) upward. And it increases the pore space for the growth of hydrate crystal. (3) Submarine landslide induced the anomalous overpressure activity and development of fracture in the GHSZ. The formation model of high concentration gas hydrate in the drilling sea area was proposed on the basis of above analysis.; Gas hydrate samples were obtained firstly in China by drilling on the northern margin of South China Sea (SCS). To understand the formation mechanism of this unique accumulation system, this paper discusses the factors controlling the formation of the system by accurate geophysical interpretation and geological analysis, based on the high precision 2-D and 3-D multichannel seismic data in the drilling area. There are three key factors controlling the accumulation of the gas hydrate system in fine grain sediment: (1) large volume of fluid bearing methane gas Joins the formation of gas hydrate. Active fluid flow in the northern South China Sea makes both thermal gas and/or biogenic gas migrate into shallow strata and form hydrate in the gas hydrate stability zone (GHSZ). The fluid flow includes mud diapir and gas chimney structure. They are commonly characterized by positive topographic relief, acoustic turbidity and push-down, and low reflection intensity on seismic profiles. The gas chimneys can reach to GHSZ, which favors the development of BSRs. It means that the active fluid flow has a close relationship with the formation and accumulation of gas hydrate. (2) The episodic process of fracture plays an important role in the generation of gas hydrate. It may provide the passage along which thermogenic or biogenic gas migrated into gas hydrate stability zone (GHSZ) upward. And it increases the pore space for the growth of hydrate crystal. (3) Submarine landslide induced the anomalous overpressure activity and development of fracture in the GHSZ. The formation model of high concentration gas hydrate in the drilling sea area was proposed on the basis of above analysis. |
| 关键词 | Gas Hydrate Fine Grain Sediment Fluid Flow Genetic Modeling South China Sea |
| 学科领域 | Geochemistry & Geophysics |
| DOI | 10.3969/j.issn.0001-5733.2009.07.019 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268558500019 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/3710 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.CAS, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China 3.CNOOC, Beijing Res Ctr, Beijing 100027, Peoples R China 4.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu Shi-Guo,Dong Dong-Dong,Yang Sheng-Xiong,et al. Genetic model of the hydrate system in the fine grain sediments in the northern continental slope of South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(7):1849-1857. |
| APA | Wu Shi-Guo.,Dong Dong-Dong.,Yang Sheng-Xiong.,Zhang Guang-Xue.,Wang Zhi-Jun.,...&Sun Yun-Bao.(2009).Genetic model of the hydrate system in the fine grain sediments in the northern continental slope of South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(7),1849-1857. |
| MLA | Wu Shi-Guo,et al."Genetic model of the hydrate system in the fine grain sediments in the northern continental slope of South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.7(2009):1849-1857. |
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