Model recovery below reflectors by optimal-transport FWI
Model recovery below reflectors by optimal-transport FWI
复制标题
通过最佳传输 FWI 进行反射器下方的模型恢复
DOI：
10.1190/segam2018-2998611.1
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Bjorn Engquist
中科院分区：
文献类型：
--
作者：
Yunan Yang;Bjorn Engquist
分析了全波形反演的不同速度恢复机制，并比较了基于最小二乘范数和最优传输的失配函数。重点将放在恢复甚至低于反射界面的速度上。L2模失配时固有的非凸性导致通过首先更新高波数分量而产生许多局部极小值，这对偏移有利，但对反演是有问题的。另一方面，基于最优传输的失配函数背后的“传输”属性自然产生低波数更新，这对于恢复模型运动学是理想的。我们将分析潜水波和反射层以上区域的速度恢复机制，以了解使用最优传输类型失配的优势。多个简单分层模式的数值算例和一个含有盐分的实际基准表明，最优传输FWI能够更新低波数分量。
We analyze different velocity recovery mechanisms of full waveform inversion (FWI) and compare misfit functions based on the least-squares (L2) norm and optimal transport. The focus will be on recovering velocity even below reflecting interfaces. The inherent nonconvexity of the L2 norm as misfit leads to many local minima by updating the high-wavenumber components first, which is good for migration but problematic for inversion. On the other hand, the “transport” property behind the optimal transport based misfit functions naturally generates low-wavenumber updates which are ideal for recovering the model kinematics. We will analyze the velocity recovery mechanisms of diving waves and for domains above reflecting layers to see the advantages of using optimal transport type of misfit. Multiple numerical examples with simple layered models as well as a realistic benchmark with salt inclusion demonstrate that optimal-transport FWI is able to update the low-wavenumber components.
影响因子：
3.3
作者：
Yunan Yang;Bjorn Engquist;Junzhe Sun;Brittany D. Froese
通讯作者：
Yunan Yang;Bjorn Engquist;Junzhe Sun;Brittany D. Froese