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Marine high resolution multi-channel digital seismic streamer and its application in the ocean engineering

PEI Yan-liang;LIU Bao-hua;LIAN Yan-hong;LIU Chen-guang;XIE Qiu-hong;First Institute of Oceanography of State Oceanic Administration;Natinal Deep Sea Center;Qingdao J iaolong Deep Ocean Technology Co.,LTD;  
A type of marine shallow strata high resolution multi-channel seismic survey system has been developed recently in China.The system is suitable for the coastal research and engineering seismic survey in the sea area depth between 5~3000 m.We believe that penetration depth of strata would be 300 m,and the resolution would be 0.3~2.0m The marine high resolution multi-channel digital seismic streamer is the important part of the system.In this paper,the structure design,hydrophone selection,group interval determination of the streamer are introduced.The seismic signal digitalized module and transmission module are elaborated.The multi-protocol communication technology described optimized the transmission system and improved the efficiency.Besides the discussions,an ocean engineering example using the steamer is also provided in this paper.The survey was carried out in Liwan 3-1 gasfield,South China Sea.The high resolution seismic profiles of the investigation show that there are several geological hazards types,such as slides/slumps,faults and turbidity current deposits,can be identified on the northern continental margins of the South China Sea.The imposing effect of the streamer applications indicate that it is the perfect equipment that can be used in marine engineering surveys covered from offshore to deep sea.
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