Wave-equation reflection traveltime inversion with dynamic warping and full-waveform inversion
Wave-equation reflection traveltime inversion with dynamic warping and full-waveform inversion
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DOI：
10.1190/geo2013-0004.1
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发表时间：
2013-10
期刊：
影响因子：
3.3
通讯作者：
Yong Ma;D. Hale
中科院分区：
文献类型：
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作者：
Yong Ma;D. Hale
在反射地震学中，全波形反演（FWI）可以生成高波数的地下速度模型，但由于地震图中缺少低频，其目标函数往往存在局部极小值。当FWI初速度模型中的低波数分量与真实模型相差甚远时，这些局部极小值会导致周期跳变。为了避免周期跳变，我们发现了一种新的波方程反射走时反演（WERTI）来更新速度模型的低波数分量，而使用FWI只更新模型的高波数细节。我们以交替的方式实现了低波数反转和高波数反转。在WERTI中，我们使用动态图像翘曲（DIW）来估计记录数据和合成数据之间的时间偏移。与通常用于行时估计的基于相关的技术相比，DIW可以避免周期跳变并准确地估计时移，即使时移变化很快。因此，通过最小化tr…
ABSTRACTIn reflection seismology, full-waveform inversion (FWI) can generate high-wavenumber subsurface velocity models but often suffers from an objective function with local minima caused mainly by the absence of low frequencies in seismograms. These local minima cause cycle skipping when the low-wavenumber component in the initial velocity model for FWI is far from the true model. To avoid cycle skipping, we discovered a new wave-equation reflection traveltime inversion (WERTI) to update the low-wavenumber component of the velocity model, while using FWI to only update high-wavenumber details of the model. We implemented the low- and high-wavenumber inversions in an alternating way. In WERTI, we used dynamic image warping (DIW) to estimate the time shifts between recorded data and synthetic data. When compared with correlation-based techniques often used in traveltime estimation, DIW can avoid cycle skipping and estimate the time shifts accurately, even when shifts vary rapidly. Hence, by minimizing tr...