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摘要
Full waveform inversion (FWI) which is an advanced seismic imaging technique based on the data fitting of full wavefield simulation has become extremely important in both academic research and commercial application in recent years. During the implementation of FWI, seismic velocities of deeper and complex parts of the model cannot be well updated due to the weak energy of seismic wavefields where they have less contributions to the mismatch between observed and calculated data in the objective function, even though the large velocity contrasts do. The uneven distribution of energy may have a significantly negative effect on reconstructing velocity structures of deep and complex zones. Therefore, an adaptive energy compensation method based on seismic illumination analysis is proposed to improve the imaging quality for FWI. We discuss the effects of limited maximum offset and complex velocity structures on the inhomogeneous energy distribution of seismic wavefields in terms of 2D acoustic wave equation. Two-way seismic illumination analysis is applied to calculate wavefield energy, adaptively compensate and balance the gradients according to the reflection and transmission coefficients which represent the partitioning of seismic waves energy at an interface. Numerical examples demonstrate the improved imaging accuracy without sacrificing too much computational efficiency of FWI when the maximum is limited.
- 出版日期2016-6
- 单位吉林大学
