Time domain full waveform inversion with low frequency wavefield decompression
作者: Liang ZhanyuanWu GuochenZhang Xiaoyu
作者单位: 1China University of Petroleum Huadong—Qingdao Campus. Qingdao, CN 266555, People’s Republic of China
刊名: Journal of Geophysics and Engineering, 2018, Vol.15 (6)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1742-2140/aac62f
原始语种摘要: Full waveform inversion (FWI) aims to recover the most accurate velocity components with full wave information. FWI produces nearly perfect results when the input seismic data contains enough low-frequency information. We first analyze the relationship between the gradient and the velocity perturbation based on the Born approximation. Compared with the frequency domain, the wavefield in the time domain contains a second-order time-derivative operator. For this reason, time-domain schemes are not very effective at recovering the very low wavenumbers, which are suppressed by the derivative operators. Accordingly, we propose a new method introducing a low-frequency decompression operator into the objective function to compensate for the high-passed filter effects in the time domain FWI. The...
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  • decompression 减压
  • domain 领域
  • recover 挽回
  • inversion 倒转
  • operator 话务员
  • frequency 频率
  • derivative 衍生物
  • objective 接物镜
  • determination 测定
  • suppressed 被抑制的