Laplace–Fourier-Domain Full Waveform Inversion of Deep-Sea Seismic Data Acquired with Limited Offsets

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• 作者：Yongchae Cho ; Wansoo Ha ; Youngseo Kim ; Changsoo Shin…
• 关键词：Full waveform inversion ; Laplace–Fourier domain ; downward continuation
• 刊名：Pure and Applied Geophysics
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：173
• 期：3
• 页码：749-773
• 全文大小：23,934 KB
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• 作者单位：Yongchae Cho (1)
  Wansoo Ha (2)
  Youngseo Kim (3)
  Changsoo Shin (4)
  Satish Singh (5)
  Eunjin Park (4)
  
  1. Schlumberger Information Solutions, 136 Sejong-daero, Jung-gu, Seoul, 100-768, Republic of Korea
  2. Pukyong National University, 45 Yongso-ro, Nam-gu, Busan, 608-737, Republic of Korea
  3. Saudi Aramco, Dhahran, Saudi Arabia
  4. Seoul National University, 1 Gwanak-ro, Gwnak-gu, Seoul, 151-744, Republic of Korea
  5. Institute de Physique du Globe de Paris, 1 Avenue Jussieu, 75238, Paris, France
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9136

文摘

Laplace–Fourier-domain full waveform inversion is considered one of the most reliable schemes to alleviate the drawbacks of conventional frequency-domain inversion, such as local minima. Using a damped wavefield, we can reduce the possibility of converging to local minima and produce an accurate long-wavelength velocity model. Then, we can obtain final inversion results using high-frequency components and low damping coefficients. However, the imaging area is limited because this scheme uses a damped wavefield that makes the magnitudes of the gradient and residual small in deep areas. Generally, the imaging depth of Laplace–Fourier-domain full waveform inversion is half the streamer length. Thus, dealing with seismic data in the deep-sea layer is difficult. The deep-sea layer reduces the amplitude of signals and acts as an obstacle for computing an exact gradient image. To reduce the water layer’s effect, we extrapolated the wavefield with a downward continuation and performed refraction tomography. Then, we performed Laplace–Fourier-domain full waveform inversion using the refraction tomography results as an initial model. After obtaining a final velocity model, we verified the inversion results using Kirchhoff migration. We presented common image gathers and a synthetic seismogram of Sumatra field data to prove the reliability of the velocity model obtained by Laplace–Fourier-domain full waveform inversion. Through the test, we concluded that Laplace–Fourier-domain full waveform inversion with refraction tomography of the downward-continued wavefield recovers the subsurface structures located at depth despite a relatively short streamer length compared to the water depth.