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《Chinese Journal of Geophysics》 2017-02
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A preliminary study of submarine cold seeps applying Seismic Oceanography techniques

CHEN Jiang-Xin;SONG Hai-Bin;GUAN Yong-Xian;YANG Sheng-Xiong;BAI Yang;GENG Ming-Hui;Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology,Ministry of Land and Resources,Qingdao Institute of Marine Geology,China Geological Survey;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology;State Key Laboratory of Marine Geology,School of Ocean and Earth Science,Tongji University;Key Laboratory of Marine Mineral Resources,Ministry of Land and Resources,Guangzhou Marine Geological Survey;  
Submarine cold seeps are widely distributed in the continental margin seas around the world. As opposed to the earlier detections of cold seep plumes using a high frequency acoustic method, a conventional multichannel seismic reflection(Seismic Oceanography) method is applied in this study to image the water column near the seafloor. Along with ananalys of the fluid escape structures, the development position, seismic reflection characteristics, and features of the cold seeps have been described and discussed here.Seismic reflection from the water column is very weak; therefore, seismic sections above and below the seafloor are processed in two different sequences as follows:(1) geometry definition,direct wave attenuation and amplitude recovery,highpass filter, common midpoint sorting,constant velocity(seawater sound velocity) stack, and post-stack FK filter in some sections; and(2) data quality control, amplitude recovery,6~100 Hz bandpass filter,multiple attenuation,deconvolution, velocity analysis, normal moveout correlation, common midpoint stack, poststack noise attenuation, 4~70 Hz bandpass filter, and FX migration. The processed sections are then assembled together along the seafloor after the color scale has been carefully adjusted.The analysis shows that active cold seeps primarily present plume,broom, or irregular geometric shapes in the water column, with weak and chaotic seismic reflections. Sometimes the seismic reflection amplitude is enhanced, likely because of the suspended mud or particles in the water column. Cold seepage activities are usually associated with the fluid escape structures of mud diapirs,pipes, faults, fissures, gas chimneys, seabed pockmarks, and mud volcanoes,reflecting fluid migration from deep to shallow strata,seep or escape at the seafloor, and formation of wide-spread cold seep activities. All the results are derived from a comprehensive interpretation of the seismic sections of the water columns and strata; however, field studies,theoretical simulations, and experiments are required for further confirmation.
【Fund】: 国家自然科学基金重大计划重点项目(91128205)与国家自然科学基金(41576047)和(41606077)资助
【CateGory Index】: P738
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