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Pure and Applied Geophysics

, Volume 173, Issue 3, pp 749–773 | Cite as

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

  • Yongchae Cho
  • Wansoo Ha
  • Youngseo Kim
  • Changsoo Shin
  • Satish Singh
  • Eunjin ParkEmail author
Article

Abstract

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.

Keywords

Full waveform inversion Laplace–Fourier domain downward continuation 

Notes

Acknowledgments

This research was a part of the project titled ‘The Study of Marine Geology and Geological Structure in the Korean Jurisdictional Seas’, funded by the Ministry of Oceans and Fisheries, Korea, and was supported by the Energy Efficiency and Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy (No. 20132010201760). Also, we would like to extend our gratitude to Total oil company for providing a Sumatra seismic dataset to Seoul National University.

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Copyright information

© Springer Basel 2015

Authors and Affiliations

  • Yongchae Cho
    • 1
  • Wansoo Ha
    • 2
  • Youngseo Kim
    • 3
  • Changsoo Shin
    • 4
  • Satish Singh
    • 5
  • Eunjin Park
    • 4
    Email author
  1. 1.Schlumberger Information SolutionsSeoulRepublic of Korea
  2. 2.Pukyong National UniversityBusanRepublic of Korea
  3. 3.Saudi AramcoDhahranSaudi Arabia
  4. 4.Seoul National UniversitySeoulRepublic of Korea
  5. 5.Institute de Physique du Globe de ParisParisFrance

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