海上时移地震中潮汐校正应用研究

Tidal corrections for marine time-lapse seismic

时移地震中两次地震资料采集时间不同,记录的潮汐量不同,导致两次资料中出现一定时差,并且采集资料时基准面不统一,所以时移地震资料处理中潮汐校正成为必要环节。本文介绍一种时移地震中基于潮位值预测的潮汐校正方法,并采用水深数据快速检验该方法计算潮汐量的合理性,也引入非一致性值作为质控两次资料潮汐校正效果的定量化参数。此外,也通过对比校正前后地震剖面,验证了该潮汐校正方法的可靠性,说明该方法实用价值高。

Since base and monitor surveys for marine time-lapse seismic are always operated at different times,tidal values recorded and acquisition datum are different.So taking tidal corrections is a necessary procedure for marine time-lapse seismic to overcome these issues.We propose in this paper an approach to tidal corrections.This approach is tested by water depth data and seismic data.And we use the normalized RMS(NRMS)difference as aquantitative QC parameter to check tidal corrections.Test results demonstrate the practicability and effectiveness of the proposed approach.