石油地球物理勘探2025，Vol.60Issue(6)：1429-1441,13.DOI:10.13810/j.cnki.issn.1000-7210.20240390
海洋资料全波形反演实用技术
Practical technology for full waveform inversion of marine data
摘要
Abstract
Full waveform inversion(FWI)is currently the most accurate velocity field inversion technique.FWI employs gradient-based local optimization algorithms to minimize the error between the forward data and the original data,thereby obtaining an accurate subsurface velocity field.The success of FWI on real data relies on the careful processing of original data and the prudent selection of inversion strategies.This paper discusses and experiments with the parameter control and implementation strategies of FWI,considering the characteris-tics of marine data,and proposes practical techniques for full waveform inversion of marine data.Specifically,the technology is as follows.① The fraction frequency noise suppression technology is used for turning waves,which primarily improves the signal-to-noise ratio of low-frequency turning waves while avoiding damage to the effective signal.② The wavelet adjustment techniques to enhance the accuracy of the initial wavelet are ap-plied,which allows for more precise calculation of the error between forward data and actual data and leads to a more accurate calculation of the velocity update gradient.③ The first-arrival tomography inversion velocity models for near-seafloor velocity modeling improve the accuracy of the initial velocity field,better avoid cycle skipping,and ensure that the objective function converges towards a more accurate direction and at a faster rate.④ The offset increment strategy is adopted during FWI iterations,progressively updating the velocity field from shallow to deep,reducing the solution multiplicity of FWI,and ensuring more accurate convergence of the FWI velocity field.This technology has achieved relatively good results in practical marine data projects,ob-taining more accurate velocity fields and better depth migration imaging effects.关键词
全波形反演/分频噪声压制/子波调整/近海底速度建模/炮检距递增策略Key words
full waveform inversion/fraction frequency noise suppression/wavelet adjustment/near-seafloor ve-locity modeling/offset increment strategy分类
天文与地球科学引用本文复制引用
WANG Binggang,DING Chengzhen,YANG Yang,ZHANG Dan,DONG Qingyu,GENG Hui..海洋资料全波形反演实用技术[J].石油地球物理勘探,2025,60(6):1429-1441,13.基金项目
本项研究受中国石油天然气集团有限公司重大科技专项"海外复杂领域物探处理关键技术研究"(2021DJ3401)和东方地球物理公司项目"局部角度域数据在裂缝预测中的应用"(12-02-04-2023)联合资助. （2021DJ3401）
