海洋高分辨率多道数字地震拖缆技术研究与应用

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

研发了一套适应水深5~3000 m的海洋浅地层高分辨率多道地震探测技术，穿透深度海底以下300 m以下、分辨率0.3~2.0 m，整体达到国外同类技术水平.高分辨率多道数字地震拖缆是其重要组成部分，本文从拖缆的总体设计着手，介绍了地震拖缆的结构设计、水听器的选择和道间距的确定，重点讨论了地震信号的数字化和信号传输方式，所述多协议传输方法优化了高速传输设计，提高了传输效率.最后给出地震拖缆在南海荔湾3-1气田的工程应用实例，工程中获得的剖面清晰显示了研究区的典型滑坡面特征，说明系统可以满足近海至远海海洋研究和工程勘察的需要，具有很好的应用前景.

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 0.3~2.0 m. 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.