Heat flow pattern, base of methane hydrates stability zonesn and BSRs in Shenhu Area, northern South China Sea
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.
methane hydrate BSR base of methane hydrate stability zone slump heat flow
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 Univers Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,China Guangzhou Marine Geological Survey,Guangzhou,Guangdong 510760,China
国内会议
乌鲁木齐
英文
212-220
2011-08-11（万方平台首次上网日期，不代表论文的发表时间）