Visco-Acoustic FWI for Imaging Beneath Complex Gas Clouds
- Min Wang (CGG) | Yi Xie (CGG) | Bingmu Xiao (CGG) | Andrew Ratcliffe (CGG) | Thomas Latter (CGG)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 26-28 March, Beijing, China
- Publication Date
- Document Type
- Conference Paper
- 2019. International Petroleum Technology Conference
- 5.1.8 Seismic Modelling
- FWI, absorption, inversion
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- 85 since 2007
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The anelastic effects of the earth can cause frequency dependent energy attenuation and phase distortion, especially when gas clouds are present. To correct these unwanted effects for proper imaging, both the velocity and quality factor (Q) models need to be accurately estimated. With FWI offering the capability to obtain higher-resolution models than tomography, visco-acoustic FWI (Q-FWI) is highly desirable for inverting both Q and velocity models together.
The visco-acoustic wave propagation in an anisotropic medium and the gradient computation for model parameters can be implemented in the framework of FWI. However, the similar radiation patterns between velocity and Q make the joint inversion non-trivial (Malinowski et al., 2011; Plessix et al., 2016). Based on the observation that the absorption effects vary with frequency, we can use a range of frequencies to decouple the effects of velocity and Q anomalies. The dispersion relationship helps to reduce the cross-talk between the velocity and Q estimation and provides meaningful updates of these two parameters. The proposed Q-FWI, driven by diving-waves for jointly estimating velocity and Q, is applied on both synthetic and real data to validate its effectiveness.
|File Size||918 KB||Number of Pages||6|
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