Heat flow pattern,base of methane hydrates stability zones and BSRs in Shenhu Area,northern South China Sea

查看全文 作　　者：ZHANG [1,2]Yi;HE [1]Lijuan;WANG [1]Jiyang;XU [3]Xing;SHA [3]Zhibing;GONG [3]Yuehua;WANG [3]Hongbing;LIANG [3]Jinqiang

机构地区：[1]Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China;[2]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;[3]Guangzhou Marine Geological Survey, Guangzhou, Guangdong 510760, China

出　　处：《Acta Oceanologica Sinica》索引2011年第30卷第1期,共9页

基　　金：The National Natural Science Foundation of China under contract No. 40774033;863 Program under contract No. 2006AA09A203-05;973 Program under contract No. 2009CB219503 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. 关键词：甲烷水合物南海北部 BSR 中国流模式稳定区水合物稳定带沉积速率

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Heat flow pattern,base of methane hydrates stability zones and BSRs in Shenhu Area,northern South China Sea

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