Abstract
Summary Intrinsic attenuation in seismic wave propagation leads to amplitude loss and phase dispersion in seismic data. The attenuation effects are a common cause for inaccurate image location and dimmed energy in reverse time migration (RTM). Conventional viscoacoustic RTM (Q-RTM) methods implement attenuation compensation by reversing the sign of the amplitude loss term and keeping the dispersion term unchanged for both forward and backward wavefield extrapolation, which require decoupled viscoacoustic wave equation and give rise to numerical instability issue. To address these problems, we have developed a stable and effective attenuation compensated viscoacousitc RTM method. The proposed method uses an attenuated source and receiver wavefield energy to normalize the crosscorrelation imaging condition to compensate the attenuation effect. Due to the use of attenuated wavefield in the new imaging condition, the instability issue is avoided. Numerical tests prove the validation and effectiveness of the proposed method.
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