射线追踪算法在提高OBN定位精度中的应用  

Application of ray-tracing method in improving OBN positioning accuracy

作　　者：曹明强 丁冠东 霍立锋 李晓亮 李灏 Cao Mingqiang;Ding GuANDong;Huo Lifeng;Li Xiaoliang;Li Hao

机构地区：[1]东方地球物理公司海洋物探处,天津塘沽300457

出　　处：《物探装备》2020年第3期170-172,179,共4页Equipment for Geophysical Prospecting

摘　　要：在海洋地震勘探中,海水速度分层影响节点采集单元初至波定位精度。在野外施工中,采用盐温仪,获得准确的海水速度,为海水速度模型的建立和定量分析提供了支持。本文基于野外实测的海水速度数据,利用射线追踪方法,定量分析了海水速度分层对节点采集单元定位精度的影响。研究结果表明,在近偏移位置,分层速度的影响较大;在建立整工区海水速度模型的基础上,取海水平均速度应用于初至波定位,能够最大限度地降低海水分层所带来的影响。In marine seismic exploration,the node position obtained by FBP method is affected by water velocity which is not a constant.The accurate water velocity can be acquired by conducted TSD production,and this set the basis for water velocity model building and qualified analyze the affection on node position.In this paper,ray tracing method is utilized for analyzing the affection of layer water velocity based on the real field TSD data.The research result shows that the affection is relatively great while considering the near offset traces.The average water velocity is preferred to be used in FBP method once the water velocity model is available throughout the survey area,and this can greatly reduce the affection of layer water velocity on node position.

关 键 词：海水速度 分层 射线路径 初至波定位 

分 类 号：P631.46[天文地球—地质矿产勘探]