| ZHANG Yi,HE Lijuan,WANG Jiyang,XU Xing,SHA Zhibing,GONG Yuehua,WANG Hongbing,LIANG Jinqiang. 2011. Heat flow pattern, base of methane hydrates stability zones and BSRs in Shenhu Area, northern South China Sea. Acta Oceanologica Sinica, (1):59－67 |
| Heat flow pattern, base of methane hydrates stability zones and BSRs in Shenhu Area, northern South China Sea |
| Heat flow pattern, base of methane hydrates stability zones and BSRs in Shenhu Area, northern South China Sea |
| Received:January 18, 2010 Revised:September 27, 2010 |
| DOI：10.1007/s13131-011-0091-x |
| Key words:methane hydrate BSR base of methane hydrate stability zone slump heat flow |
| 中文关键词: methane hydrate BSR base of methane hydrate stability zone slump heat flow |
| 基金项目:The National Natural Science Foundation of China under contract No. 40774033; 863 Program under contract No. 2006AA09A203-05; 973 Program under contract No. 2009CB219503. |
| Author Name | Affiliation | E-mail | | ZHANG Yi | Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
Graduate University of the Chinese Academy of Sciences, Beijing 100049, China | zhangyi@mail.iggcas.ac.cn | | HE Lijuan | Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China | | | WANG Jiyang | Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China | | | XU Xing | Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China | | | SHA Zhibing | Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China | | | GONG Yuehua | Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China | | | WANG Hongbing | Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China | | | LIANG Jinqiang | Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China | |
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| Abstract: |
| Using the collected 433 heat flow values, we estimated the bases of methane hydrate stability zone (BHSZ), in northern South China Sea (NSCS). Through comparing BHSZs with the depths of bottom simulating reflectors (BSRs), in Shenhu Area (SA), we found that there are big differences between them. In the north of SA, where the water depth is shallow, many slumps developed and the sedimentation rate is high, it appears great negative difference (as large as -192%). However, to the southeast of SA, where the water depth is deeper, sedimentation rate is relatively low and uplift basement topography exists, it changes to positive difference (as large as +45%). The differences change so great, which haven't been observed in other places of the world. After considering the errors from the process of heat flow measurement, the BSR depth, the relationship of thermal conductivity with the sediments depth, and the fluid flow activities, we conclude that the difference should be not caused by these errors. Such big disagreement may be due to the misunderstanding of BSR. The deviant "BSRs" could represent the paleo-BSRs or just gas-bearing sediment layers, such as unconformities or the specific strata where have different permeability, which are not hydraterelated BSRs. |
| 中文摘要: |
| Using the collected 433 heat flow values, we estimated the bases of methane hydrate stability zone (BHSZ), in northern South China Sea (NSCS). Through comparing BHSZs with the depths of bottom simulating reflectors (BSRs), in Shenhu Area (SA), we found that there are big differences between them. In the north of SA, where the water depth is shallow, many slumps developed and the sedimentation rate is high, it appears great negative difference (as large as -192%). However, to the southeast of SA, where the water depth is deeper, sedimentation rate is relatively low and uplift basement topography exists, it changes to positive difference (as large as +45%). The differences change so great, which haven't been observed in other places of the world. After considering the errors from the process of heat flow measurement, the BSR depth, the relationship of thermal conductivity with the sediments depth, and the fluid flow activities, we conclude that the difference should be not caused by these errors. Such big disagreement may be due to the misunderstanding of BSR. The deviant "BSRs" could represent the paleo-BSRs or just gas-bearing sediment layers, such as unconformities or the specific strata where have different permeability, which are not hydraterelated BSRs. |
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