The shallow gas cloud’s presence will bring severe travel time distortion and energy absorption to seismic data. For compensating the amplitude and frequency attenuation, Q tomography is the proposed approach. And Bohai Bay is known as its large gas cloud size and complex faults system. It has been a difficulty to recover the energy and image below gas zone for decades in this area. In this paper, we illustrated the application of Q compensation in Bohai Bay for the first time. With careful parameterization of serial preprocessing such as multiple attenuation, depth velocity building and Q field tomography. Final results show that vague zone caused by gas cloud has been reduced obviously. We demonstrated that Q tomography is an effective solution for gas cloud problem in Bohai Bay region.


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  1. Quan, Y. and J. M.Harris
    , [1997] Seismic attenuation tomography using the frequency shift method: Geophysics, 62, 895–905.
    [Google Scholar]
  2. Mittet, R.
    , 2007, A simple design procedure for depth extrapolation operators that compensate for absorption and dispersion: Geophysics, 72(2), S105–S112.
    [Google Scholar]
  3. Cavalca, M., Moore, I., Zhang, L., Ng, S.L., Fletcher, R. and Bayly, M.
    [2011] Ray-based Tomography For Q Estimation And Q Compensation In Complex Media. Society of Exploration Geophysicists.
    [Google Scholar]
  4. Traynin, P., J.Liu, and J. M.Reilly
    , [2008] Amplitude and bandwidth recovery beneath gas zones using Kirchhoff prestack depth Q-migration: 78th Annual International Meeting, SEG, Expanded Abstracts, 2412–2416.
    [Google Scholar]
  5. Heggland, R.
    [2005] Using gas chimneys in seal integrity analysis: A discussion based on case histories. In: P. Boult and J. Kaldi, (Eds) Evaluating fault and cap rock seals. AAPG Hedberg Series, 2, 237–245.
    [Google Scholar]

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