One-way waveform inversion: Real marine data application

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Aimen Ben-hassine, Véronique Duprat, Reda Baina, Daniel Brito
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Abstract

The reflection waveform inversion is a powerful technique to build a large-scale velocity model of the subsurface by fitting the reflected recorded seismic waves. The reflection waveform inversion is designed based on the pillar concept of model and data-scale separation. Therefore, its success is related to the ability of its forward modelling engine to separate reflected events distinctly from other propagation modes (diving waves, multiples, etc.). However, the standard Born modelling based on the two-way wave equation may generate internal multiples in case of an insufficient smooth background model. These internal multiples may lead to a distorted sensitivity kernel, which adds more non-linearity to the inverse problem. In addition, simulating the wave equation using two-way propagators is still an overburden step of the algorithm especially in large three-dimensional real surveys. In this proposal, we introduce an alternative to the two-way wave equation by using a one-way approach for the reflection waveform inversion. The Born modelling based on one-way propagators significantly reduces the computational cost and I think it should be allows to relax the smooth background velocity model assumption by restricting the forward modelling to primary reflected waves. After a brief theoretical description of the one-way waveform inversion, we present an application of the algorithm on the real marine dataset to review its promises and pitfalls. Our approach produces an acceptable large-scale velocity model whose accuracy is confirmed by the migrated image and the offset gathers.

单向波形反演真实海洋数据应用
反射波形反演是一种功能强大的技术,通过拟合反射记录的地震波,建立地下大尺度速度模型。反射波形反演的设计基于模型和数据尺度分离的支柱概念。因此,其成功与否与其前向建模引擎能否将反射事件与其他传播模式(潜波、多重波等)区分开来有关。然而,基于双向波方程的标准博恩建模可能会在背景模型不够平滑的情况下产生内部多重波。这些内部倍数可能会导致灵敏度核失真,从而增加逆问题的非线性。此外,使用双向传播器模拟波方程仍然是算法的一个负担过重的步骤,尤其是在大型三维实际勘测中。在本建议中,我们引入了一种双向波方程的替代方法,即使用单向方法进行反射波形反演。基于单向传播者的博恩建模大大降低了计算成本,而且我认为应该可以通过将前向建模限制在主反射波上来放宽平滑背景速度模型假设。在简要介绍了单向波形反演的理论之后,我们介绍了该算法在实际海洋数据集上的应用,以回顾其前景和缺陷。我们的方法产生了一个可接受的大尺度速度模型,其准确性得到了迁移图像和偏移采集的证实。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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