摘要
海底地震仪(OBS)广泛应用于海洋地球物理勘探,在地壳内部结构研究、海底滑坡监测、资源勘探等多个领域发挥着不可替代的作用。OBS在海面投放后,受多个因素的影响,实际落点位置与投放点通常会有较大的偏离,这种偏差会严重降低后续成像或反演的精度,因此,针对OBS进行二次定位是数据处理的关键环节。本文梳理了OBS二次定位的主要方法,并对神狐海域实际采集的OBS数据进行了二次定位。本次OBS资料在采集前对采集板电路进行了改造,开展了时钟漂移纠偏,实现了整个采集系统相对时间戳一致;在此基础上应用时间切片法完成了二次定位,得到的二次定位结果均能满足实际科研需求,且反演得到的等效水速和深度结果与拖缆地震深度域成像结果更为接近。
The ocean-bottom seismometers(OBS),a tool extensively utilized in marine geophysical exploration,hold indispensable significance for studies on the Earth's crustal structure,submarine landslide monitoring,and resource exploration.Upon OBS deployment on the ocean's surface,its final landing position typically deviates significantly from the predetermined position due to the influence of various factors.This positional deviation will severely undermine the accuracy of subsequent seismic imaging or inversion.Consequently,the OBS repositioning is necessary during data processing.This study reviewed the primary methods for OBS repositioning and applied them to the OBS data acquired in the Shenhu area,the South China Sea.Prior to data acquisition,the circuit of the data acquisition board was modified,including clock skew correction,achieving timestamp synchronization across the entire acquisition system.Building upon these enhancements,repositioning was successfully performed using the time-slice method.The repositioning results consistently satisfy the rigorous research requirements,while inverted equivalent water velocity and depth parameters demonstrate closer alignment with depth-domain imaging results derived from towed-streamer seismic surveys.
作者
陈玺
伍忠良
王祥春
王明
李福元
王猛
李建平
林江南
CHEN Xi;WU Zhong-Liang;WANG Xiang-Chun;WANG Ming;LI Fu-Yuan;WANG Meng;LI Jian-Ping;LIN Jiang-Nan(Guangzhou Marine Geological Survey,Guangzhou 511458,China;National Engineering Research Center for Gas Hydrate Exploration and Development,Guangzhou 511458,China;School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《物探与化探》
2026年第1期162-168,共7页
Geophysical and Geochemical Exploration
基金
广东省海洋经济发展专项(GDNRC[2023]40)
中国地质调查局项目(DD20201118,DD20240090)
国家重点研发计划青年科学家项目(2024YFF0509900)。
关键词
海底地震仪
海洋地球物理
二次定位
直达波走时
时钟漂移
神狐海域
ocean-bottom seismometer(OBS)
marine geophysics
repositioning
direct-wave traveltime
clock skew
Shenhu area
