Abstract：Towed streamer is the main tool of offshore seismic explorations. We firstly introduce in this paper the distribution of compasses and their role in towed streamer seismic exploration, and then explain how to use the compass data to determine streamer shape by fitting and integral methods, and discuss the influences of the declination corrections and meridian convergence corrections on the streamer spatial position. Based on the field data analysis, the following observation are obtained: Accurate corrections of the magnetic declination and meridian convergence angle are very important for the streamer positioning; the magnetic declination corrections and meridian convergence must be add to every compass data in network computing in order to improve the accuracy streamer positioning and meet the needs of field operation.
Yi Changhua,Cao Guofa,Fang Shouchuan et al. Fitting of offshore towed streamer shapes. Geomatics and Information Science of Wuhan University,2010,35(6):702-704.
[2]
Maus S,Macmillan S,McLean S et al. The US/UK World Magnetic Model for 2010-2015. NOAA Technical Report NESDIS/NGDC,2010.
Zhou Weijing,Shen Huairong. A method of automatically computing magnetic declination via the geomagnetic declination map. Engineering of Surveying and Mapping,2007,16(1):51-54.
[4]
杨明.磁偏角仪在海洋地震中的应用.海洋石油,2013,33(3):122-126.
Yang Ming. Application of declinometer in offshore seismic survey. Offshore Oil,2013,33(3):122-126.
[5]
王民,冉莉. 便携卫星天线精确定位研究. 中国科技信息,2013,(7):94-94.
Wang Min,Ran Li. Research on accurate positioning using portable satellite antenna. China Science and Technology Information,2013,(7):94-94.
