论文标题

局部波场倒置(LWI):用于局部FWI的多块ADMM的改编

Localized Wavefield Inversion (LWI): an Adaptation of Multi-Block ADMM for Localized FWI

论文作者

Aghamiry, Hossein S., Gholami, Ali, Operto, Stephane, Malcolm, Alison

论文摘要

全波形反演(FWI)是一种高分辨率和计算密集型成像技术,可在波浪传播的计算模型中重建未知参数。但是,某些应用需要仅需要该介质的一部分的准确模型。为了减轻此类问题的计算负担,提出了面向目标的FWI,其中使用了波动方程的介质或局部求解器部分的重新绘制数据。另一方面,FWI的经典配方遭受非线性和不良性,这使得FWI对初始模型,数据的低频含量和有限的照明敏感。在这项研究中,我们提出了基于乘数的交替方向方法(基于ADMM)的FWI方法的局部版本,该方法提议在经典FWI中解决这些问题。在我们局部的FWI或LWI中,该介质被分解为一些子域,其中一些媒介是根据多块ADMM的适应来确定的,而其他介质则保持固定,这是解决分解和块分离性和块分离性的强大算法。在Marmousi模型上进行延时应用的数值测试证实了对背景速度模型误差的计算效率和鲁棒性。

Full-waveform inversion (FWI) is a high-resolution and computationally intensive imaging technique to reconstruct unknown parameters in the computational model in which the waves propagate; however, an accurate model of only part of this medium is required for some applications. To decrease the computational burden of such problems, target-oriented FWI was proposed where the redatumed data on the part of the medium or localized solvers for the wave equation are used. On the other hand, the classical formulation of FWI suffers from non-linearity and ill-posedness, which makes FWI sensitive to the initial model, the low-frequency content of the data, and limited illumination. In this study, we propose a localized version of the alternating direction method of multipliers (ADMM)-based FWI method, which was proposed to solve these problems in classical FWI. In our localized FWI or LWI, the medium is decomposed into a few subdomains, where some of them are updated, and the others are kept fixed based on an adaptation of multi-block ADMM, which is a powerful algorithm for solving inverse problems with decomposition and block separability. Numerical tests on the Marmousi model for a time-lapse application confirm the computational efficiency and robustness against background velocity model errors.

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