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

Acta Oceanologica Sinica 2011年第1期30卷 59-67页

作者： ZHANG Yi HE Lijuan WANG Jiyang XU Xing SHA Zhibing GONG Yuehua WANG Hongbing LIANG Jinqiang Institute of Geology and Geophysics Chinese Academy of Science Beijing 100029 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Guangzhou Marine Geological Survey Guangzhou Guangdong 510760 China

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： methane hydrate BSR base of methane hydrate stability zone slump heat flow

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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 a...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： ZHANG Yi~(1,2*),HE Lijuan~1,WANG Jiyang~1,XU Xing~3,SHA Zhibing~3,GONG Yuehua~3, WANG Hongbing~3,LIANG Jinqiang~3 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

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 Shcnhu Area(SA),we found that there are big differences between *** 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 *** 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 *** big disagreement may be due to the misunderstanding of *** 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 hydrate-related BSRs.

关键词： methane hydrate BSR base of methane hydrate stability zone slump heat flow

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