Prestack scalar reverse-time depth migration of 3D elastic seismic data
Prestack scalar reverse-time depth migration of 3D elastic seismic data
复制标题
DOI：
10.1190/1.2227519
复制
发表时间：
2006-09
期刊：
影响因子：
3.3
通讯作者：
R. Sun;G. McMechan;Chen-Shao Lee;J. Chow;Chen-Hong Chen-Chen-Hong-Chen-2110184121
中科院分区：
文献类型：
--
作者：
R. Sun;G. McMechan;Chen-Shao Lee;J. Chow;Chen-Hong Chen-Chen-Hong-Chen-2110184121
利用两个独立的三维标量逆时深度偏移，我们在三维模型中由纵波源生成并记录在模型顶部的叠前三维三分量（3-C）弹性地震数据体中偏移反射的P波和s波。在弹性地震资料的浅层向下外推过程中，分别通过散度（标量）和旋度（3-C向量）计算提取反射的P波和s波。反射P-波和P- s转换波在每一点的偏移成像时间为从震源到该点的单向P波传播时间。散度（提取的纵波）在三维p -速度模型中使用三维标量波动方程的有限差分解进行逆时外推，并成像以获得偏移的p -图像。旋度（提取的s波）首先转换为标量s波场，取旋度的绝对值作为标量s波场的绝对值，如果旋度是反数，则赋正号。
Using two independent, 3D scalar reverse-time depth migrations, we migrate the reflected P- and S-waves in a prestack 3D, three-component (3-C), elastic seismic data volume generated with a P-wave source in a 3D model and recorded at the top of the model. Reflected P- and S-waves are extracted by divergence (a scalar) and curl (a 3-C vector) calculations, respectively, during shallow downward extrapolation of the elastic seismic data. The imaging time for the migrations of both the reflected P- and P-S converted waves at each point is the one-way P-wave traveltime from the source to that point.The divergence (the extracted P-waves) is reverse-time extrapolated using a finite-difference solution of the 3D scalar wave equation in a 3D P-velocity modeland is imaged to obtain the migrated P-image. The curl (the extracted S-waves) is first converted into a scalar S-wavefield by taking the curl’s absolute value as the absolute value of the scalar S-wavefield and assigning a positive sign if the curl is counterc...