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Modelling the seismic exploration random noise based on the perturbation method and its application

机译：基于扰动方法及其应用建模地震勘探随机噪声

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摘要

The modelling technique contributes to understanding noise nature and properties. Prior work has established a primary random noise model in the homogeneous medium, however, this strict assumption of the medium may be not valid under the actual environment so that will reduce the modelling accuracy. Therefore, in this paper, a random noise model is established in the mixed heterogeneous medium to improve the modelling accuracy, so the scattered mechanism is used to describe the random noise field in the heterogeneous medium. Since the perturbation method is always applied to solve the scattering problem, the noise wave field can be regarded as the superposition of the perturbation wave field and the unperturbation wave field. Consequently, the random noise model reveals that the desert random noise is mainly caused by the wind, and it concentrates on 1-20 Hz. A detailed comparison is made between the noise model established in the homogeneous medium and the proposed noise model, the results illustrate that the proposed noise model is more similar to the actual noise. Besides, for embodying the model's practical application value, the proposed noise model is adopted as the background noise to determine the VMD (variational mode decomposition) denoising parameters. The satisfactory denoising performance supports the usefulness of the proposed noise model for the random noise attenuation.
机译：建模技术有助于了解噪声性质和属性。事先工作已经在均匀介质中建立了主要随机噪声模型，然而，这种严格的介质假设在实际环境下可能无效，以降低建模精度。因此，在本文中，在混合异构介质中建立了一种随机噪声模型，以提高建模精度，因此散射机构用于描述异构介质中的随机噪声场。由于始终应用扰动方法来解决散射问题，因此噪声波场可以被视为扰动波场和不受衰生波场的叠加。因此，随机噪声模型揭示了沙漠随机噪声主要由风引起，并且它集中在1-20Hz上。在均匀介质和所提出的噪声模型中建立的噪声模型之间进行详细的比较，结果说明所提出的噪声模型更类似于实际噪声。此外，为了体现模型的实际应用值，所提出的噪声模型被采用作为背景噪声来确定VMD（变分模式分解）去噪参数。令人满意的去噪性能支持所提出的随机噪声衰减的噪声模型的有用性。

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