Local vertical seismic profiling (VSP) elastic reverse-time migration and migration resolution: Salt-flank imaging with transmitted P-to-S waves
Local vertical seismic profiling (VSP) elastic reverse-time migration and migration resolution: Salt-flank imaging with transmitted P-to-S waves
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DOI：
10.1190/1.3309460
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发表时间：
2010-03
期刊：
影响因子：
3.3
通讯作者：
Xiang Xiao;W. Leaney
中科院分区：
文献类型：
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作者：
Xiang Xiao;W. Leaney
为了避免通过盐和过度覆盖的散发波的散落作用，并以不准确的覆盖速度模型，我们引入了一种垂直的地震概况（VSP）局部弹性反向迁移（RTM）方法，用于通过Transmitted P-to-to-to-to-P-to波浪。此方法将使用局部局部速度模型围绕孔进行反射的PS波反射，直到它们与盐边界处的后射击PP波相同。该方法的优点是它不需要复杂的过覆和盐体速度，并且会自动说明源端静态。此外，该方法解释了运动和动态效应，包括各向异性，吸收以及此LO-Cal subsalt速度模型之外的所有其他未知岩石效应。使用有限差分时域交错的网格RTM方案，对墨西哥湾的弹性盐模型和Offset 2D VSP数据进行数值测试，部分证明了该方法对干涉的有效性...
To avoid the defocusing effects of propagating waves through salt and overburden with an inaccurate overburden velocity model, we introduce a vertical seismic profiling (VSP) local elastic reverse-time-migration (RTM) method for salt-flank imaging by transmitted P-to-S waves. This method back-projects the transmitted PS waves using a local velocity model around the well until they are in phase with the back-projected PP waves at the salt boundaries. The merits of this method are that it does not require the complex overburden and salt-body velocities and it automatically accounts for source-side statics. In addition, the method accounts for kinematic and dynamic effects, including anisotropy, absorption, and all other unknown rock effects outside of this lo-cal subsalt velocity model. Numerical tests on an elastic salt model and offset 2D VSP data in the Gulf of Mexico, using a finite-difference time-domain staggered-grid RTM scheme, partly demonstrate the effectiveness of this method over interferometry ...