Separating P- and S-waves in prestack 3D elastic seismograms using divergence and curl
Separating P- and S-waves in prestack 3D elastic seismograms using divergence and curl
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DOI：
10.1190/1.1649396
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发表时间：
2004
期刊：
影响因子：
3.3
通讯作者：
R. Sun;G. McMechan;H. Hsiao;J. Chow
中科院分区：
文献类型：
--
作者：
R. Sun;G. McMechan;H. Hsiao;J. Chow
在有限差分外推过程中，利用散度和旋度可以将叠前三维三分量弹性地震剖面中的反射P波和S波分离开来。利用三维弹性波动方程将弹性地震数据从接收位置向下外推为均匀弹性计算模型。在向下外推期间，波场的散度（标量）和旋度（三分量矢量）在固定深度分别作为单分量地震记录和三分量地震记录独立计算和记录。然后将弹性计算模型中的P -和S -速度分成两个独立的模型。发散地震图（只包含P波）然后通过P速度模型向上外推（使用标量波动方程）到地面的原始接收器位置，以获得分离的P波。旋度的x分量、y分量和z分量地震图（仅包含S波）向上。
The reflected P‐ and S‐waves in a prestack 3D, three‐component elastic seismic section can be separated by taking the divergence and curl during finite‐difference extrapolation. The elastic seismic data are downward extrapolated from the receiver locations into a homogeneous elastic computational model using the 3D elastic wave equation. During downward extrapolation, divergence (a scalar) and curl (a three‐component vector) of the wavefield are computed and recorded independently, at a fixed depth, as a one‐component seismogram and a three‐component seismogram, respectively. The P‐ and S‐velocities in the elastic computational model are then split into two independent models. The divergence seismogram (containing P‐waves only) is then upward extrapolated (using the scalar wave equation) through the P‐velocity model to the original receiver locations at the surface to obtain the separated P‐waves. The x‐component, y‐component, and z‐component seismograms of the curl (containing S‐waves only) are upward ex...