Robust incident-angle field estimation: a one-way wave propagator approach
Robust incident-angle field estimation: a one-way wave propagator approach
复制标题
DOI：
10.1071/eg13002
复制
发表时间：
2013-12
影响因子：
0.9
通讯作者：
Jiangjie Zhang;Hui Zhang
中科院分区：
文献类型：
--
作者：
Jiangjie Zhang;Hui Zhang
在地震资料的许多处理步骤中，入射角是一个非常重要的信息，但在许多典型的、常见的偏移方法中，如炮点剖面波动方程偏移、逆时偏移等，入射角是不能直接估计的。在本文中，我们首先回顾和分析了一些流行的方案估计入射角场。然后，我们提出了一个鲁棒的方法来估计入射角场在二维/三维非均匀各向同性介质的基础上的单程波传播。与带限波场不同的是，入射角场的估计是由单色波场的两个脉冲响应的划分，以减少计算。脉冲响应是通过将常规偏移过程中的额外成像权重与常规图像相乘而提取的角度加权图像的导数。该方法采用倾斜坐标系，避免了单向波传播子的陡角限制。与其他方法相比，该方法具有计算效率高、存储量少、计算精度高的特点。二维分层模型的入射角场计算和三维场数据实例表明了该方法的通用性和灵活性。
The incident angle is a very important piece of information in many processing steps for seismic data, but it cannot be easily and directly estimated in many typical and familiar migration processes, such as shot-profile wave equation migration and reverse time migration. In this paper, we first revisit and analyse some popular schemes of estimating the incident-angle field. Then we present a robust method to estimate the incident-angle field in a 2D/3D heterogeneous isotropic media based on a one-way wave propagator. Unlike the band-limited wavefield, the incident-angle field is estimated by the division of two impulse responses of the monochromatic wavefield in order to reduce computation. The impulse responses are the derivative of the angle-weighted image extracted by multiplying an extra imaging weight in the conventional migration process and conventional image. The tilted coordinate system is adopted in our method to avoid the steep-angle limitation of one-way wave propagators. By comparison with other methods, our method can estimate the incident-angle field more accurately with higher efficiency and less memory cost. Computed incident-angle fields of a 2D layered model and 3D field data example demonstrate the generality and flexibility of the method.