三维F-X域粘弹性波动方程保幅偏移方法

提出了一种利用粘弹性声波波动方程进行三维偏移的新方法, 其基本思路是: 修改成像条件, 使修改后的成像方程中考虑振幅补偿, 然后利用粘弹性单程波动方程在F2X 域对震源和接收点波场进行延拓, 进而完成散射、透射等补偿。理论数据处理表明: 该方法理论基础可靠, 处理效果明显, 具有较好的推广应用前景。

3D frequency and space domain amplitude-preserved migration with viscoelastic wave equations

The paper studied a new algorithm of 3D frequency and space domain amplitude-preserved migration with viscoelastic wave equations. This code gives an alternative method which compensates Q and transmission losses in the seismic data during scalar finite-difference migration. The geometrical spreading, Q and transmission losses and dispersion are compensated simultaneously as part of the migration. Firstly, starting from the viscoelastic wave equation, high-order finite-difference format of amplitude-preserved migration operator viscoelastic was derived. Secondly, the imaging condition was modified in order to include attenuation effecting in seismic propagating wave field. Then, 3D migration was realized by using a 3D one-way depth stepping extrapolation. Good processed results of synthetic data proved that algorithm is stable, reliable and widely applicable.