| 摘要: |
| 基于频率递进的多尺度方法是提高全波形反演稳定性的有效策略之，但较为依赖于地震数据的最低有效频率，在低频数据缺失或采集数据质量不高时反演结果较差。基于此，在系统分析全波形反演波数成分与数据频率和散射角关系的基础上，实现基于波数滤波的多尺度反演方法，并与传统的时间域多尺度反演相结合，提出种基于频率-波数滤波的联合多尺度全波形反演方法，并给出具体的反演策略。通过Poynting矢量对梯度中不同散射角成分进行滤波，以大散射角信息弥补地震低频数据缺失所不能恢复的低波数成分，能有效降低传统全波形反演方法对低频数据的依赖性，增强多尺度反演方法的适应性。该方法应用到SEG/EAGE推覆体模型的试算结果表明：新方法方面可以有效弥补低频信息缺失时传统多尺度反演方法不能恢复的低波数成分；另方面可以保证波数滤波反演方法能够避免周波跳跃现象。新方法能够在低频数据缺失的情况下有效恢复模型的中低波数成分，反演能力优于传统多尺度反演方法。 |
| 关键词: 多尺度全波形反演 Poynting矢量 频率-波数滤波 地震数据 |
| DOI：10.3969/j.issn.1673-5005.2018.02.006 |
| 分类号:P631.4 |
| 基金项目:山东省重大创新工程项目（2017CXGC1608，2017CXGC1602）；中国科学院战略性先导科技专项（XDA14010303）；国际合作重点项目（41720104006）；国家油气重大专项（2016ZX05006-004，2016ZX05014001，2016ZX05002） |
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| A hybrid multi-scale full waveform inversion method based on frequency-wavenumber filter and its implementation strategies |
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HUANG Jianping, CUI Chao, LIU Mengli1,2
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1. School of Geosciences in China University of Petroleum, Qingdao 266580, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
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| Abstract: |
| Multi-scale inversion proceeding sequentially from low frequency data to high frequency data is an efficient strategy to improve the stability of full waveform inversion (FWI). However the performance of multi-scale FWI strongly relies on the quality of low frequency data. In real case, limited by the data acquisition and quality, the inversion result of conventional multi-scale VWI is usually not accurate enough due to the low quality of or sometimes missing low frequency data. In order to improve the inversion stability of FWI when the low frequency data is not available, we propose a multi-scale inversion method based on the relationship between the wavenumber recovered by FWI and the scatter angle. By inverting for the low wavenumber component using the wide scatter angle component rather than the low frequency data, the proposed method is capable of mitigating the dependence of FWI on low frequency data. The hybrid multi-scale inversion strategyis suggested based on the frequency-wavenumber filter. The synthetic data test on SEG/EAGE overthrust model verifies that the proposed method not only can recover the low wavenumber component which cannot be inverted by the conventional multi-scale FWI, but also is capable of avoiding the cycle-skipping issues.The new method can invert for the model successfully without the low frequency data, which significantly outperforms the conventional method. |
| Key words: multi-scale full waveform inversion Poynting vector frequency-wavenumber filter seismic data |
