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《Chinese Journal of Geophysics》 2015-01
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Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data

LIU Bo-Ran;SONG Hai-Bin;GUAN Yong-Xian;BAI Yang;CHEN Jiang-Xin;GENG Ming-Hui;Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Marine Geology,Tongji University;Guangzhou Marine Geology Survey;  
Gas Hydrate reservoir in the northeastern continental slope of South China Sea(SCS)have been confirmed by investigations and well drillings.Also,large amounts of methane-derived authigenic carbonates(MADC)were discovered in 2004 among this area.Based on sub-bottom profiles and seismic profiles,attributes and features associated with cold seepage system in the northeastern continental slope of SCS were analyzed.A seismic line cross the northeasterncontinental slope of SCS was used to show local sedimentary environment.Sub-bottom data were pieced together and denoised.Shallow gas,fluid migration and morphology features associated with cold seepage in processed sub-bottom profile were identified and discussed,with assistance of corresponding seismic lines and bathymetric charts.From observation of sub-bottom profiles and comparison with seismic and bathymetry data,cold seepage related features were listed as follow:(1)Acoustic plume(suspected of being cold seep)was found in a sub-bottom profile,with height of about 30 meters and width of 50 meters.(2)Mud volcanoes were found in this area,and caused discontinuity of Bottom Simulating Reflectors in seismic profiles.(3)Acoustic voids,the most frequent features in this region,had two types:"narrow"acoustic void and"broad"acoustic void."narrow"acoustic void had width of 80~400mand no layers information,"broad"acoustic void had width over 1000 m and weak layers information.(4)The area of"narrow"acoustic void overlaid with mud volcanoes concentrated area,and the acoustic plume was located around "broad"acoustic voids.Cold seepage activities exist on the northeastern continental slope of SCS,both in history and in present.The results suggest that "narrow"acoustic voids on sub-bottom profiler correspond to fluid migration path,while"broad"acoustic voids possibly related with shallow gas accumulation along rock layers.The relationship between cold seepage system and gas hydrate in the northeastern continental slope of SCS worth further investigation.
【Fund】: 国家自然科学基金重大计划重点项目(91128205);; 国家基础研究发展规划项目(2011CB403505)资助
【CateGory Index】: P631.4
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