Source-independent time-domain waveform inversion using convolved wavefields: Application to the encoded multisource waveform inversion
Source-independent time-domain waveform inversion using convolved wavefields: Application to the encoded multisource waveform inversion
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DOI：
10.1190/geo2010-0210.1
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发表时间：
2011-11
期刊：
影响因子：
3.3
通讯作者：
Yunseok Choi;T. Alkhalifah
中科院分区：
文献类型：
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作者：
Yunseok Choi;T. Alkhalifah
全波形反演需要对震源子波进行良好的估计，以提高反演成功的几率。对于编码多震源时域实现来说尤其如此，传统上，它需要对单个震源进行建模以及对波场进行傅里叶变换。作为一种替代方法，我们开发了使用卷积波场的与震源无关的时域波形反演。具体来说，失配函数由观测波场与来自模拟波场的参考道的卷积，加上模拟波场与来自观测波场的参考道的卷积组成。在这种情况下，观测波场和模拟波场的震源子波在失配函数的两项中都被同等地卷积，因此，震源子波的影响被消除了。此外，由于模拟波场起到低通滤波的作用，失配函数中的观测波场、频率选择策略……
Full waveform inversion requires a good estimation of the source wavelet to improve our chances of a successful inversion. This is especially true for an encoded multisource time-domain implementation, which, conventionally, requires separate-source modeling, as well as the Fourier transform of wavefields. As an alternative, we have developed the source-independent time-domain waveform inversion using convolved wavefields. Specifically, the misfit function consists of the convolution of the observed wavefields with a reference trace from the modeled wavefield, plus the convolution of the modeled wavefields with a reference trace from the observed wavefield. In this case, the source wavelet of the observed and the modeled wavefields are equally convolved with both terms in the misfit function, and thus, the effects of the source wavelets are eliminated. Furthermore, because the modeled wavefields play a role of low-pass filtering, the observed wavefields in the misfit function, the frequency-selection stra...