地震波动方程方向行波波场分离正演数值模拟与逆时成像

为了进一步提高对地震波传播规律的认识，将波印廷矢量引入到二维地震波动方程方向行波波场分离正演数值模拟中。 根据地震波波印廷矢量的波场数值特征，实现了对全地震波场中左行波、右行波、上行波和下行波波场的自动识别与分离。以均匀介质模型、倾斜界面模型以及 Marmousi 模型为例，开展了相应的数值模拟实验与逆时成像处理。 计算结果表明，该方法准确有效，能够实现任意时刻波场快照中方向行波的波场分离，并合成分别由左行波、右行波、上行波和下行波形成的波场快照与数值模拟记录。该方法简单易行，计算量较小，对实际地震资料中方向行波波场的识别、分离、成像及验证具有一定的应用价值。

Directional one-way wave field separating numerical simulation of the seismic wave equation and reverse-time migration

In order to further improve the knowledge of seismic wave propagation law, this paper applied Poynting vector to 2D directional one-way wave field separation numerical simulation of seismic wave equation for the first time. According to the Poynting vector wave field numerical characteristics, the seismic up-way wave, down-way wave, left- way wave and right-way wave fields are automatically recognized and separated during the seismic wave numerical simulation. Taking isotropic model, tilt layer model and Marmousi model as examples, we carried out the corresponding numerical simulation experiments. The computational results show that the presented method is correct and effective. It can get the directional one-way Wave field in the snapshots of each iteration step, and finally get the numerical records with directional one-way wave field separation. The presented method is simple and easy to accomplish with small computational cost. Therefore, it has important application value in the different one-way wave identification and separation processing and in imaging stage of the practical seismic data.