近海高分辨率多道地震拖缆系统及其在海洋工程中的应用

目前我国近海工程地震勘探主要使用单道地震拖缆接收,地层分辨率较低,无法进行速度分析、覆盖叠加等精细处理.为了解决此问题,本文提出近海高分辨率多道地震拖缆技术,并结合该技术的研究成果,简要介绍了多道地震勘探系统组成和地震拖缆的结构设计,讨论了拖缆水听器的选择,组内距、道间距的确定,并给出了一个工程应用实例.该系统可以满足今后海洋研究和工程勘探的需要,在试验和应用中取得了很好的探测效果,具有很好的应用前景.

The offshore high-resolution multi-channel seismicstreamer and its application to the ocean engineering

The main equipment of offshore seismic exploration of China is the single channel seismic explore system. It is difficult to enhance the resolution in shallow strata. Pointing to the problem, the offshore high resolution multi-channel seismic streamer system is proposed. The system redounds to coastal research and ocean engineering. The quality of seismic profiles would enhance after onboard processings, such as velocity analysis, stacking and migration. The streamer has four sections. They are the deck segment, the leading vibration isolation segment, working segment, and tail segment. The hydrophones made by the Institute of Acoustics of Chinese Academy of Sciences are used. By means of calculation, the individual hydrophone element spacing in a group is determined as 0.15 m. The streamer group interval is determined as 3.125 m. Besides the structure discussion and an ocean engineering example are also presented in this paper.