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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Seismic Signal Enhancement and Noise Suppression Using Structure-Adaptive Nonlinear Complex Diffusion
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Seismic Signal Enhancement and Noise Suppression Using Structure-Adaptive Nonlinear Complex Diffusion

机译：采用结构自适应非线性复杂扩散的地震信号增强和噪声抑制

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摘要

In seismic exploration, effective seismic noise attenuation along with seismic signal preservation is a key problem for seismic signal processing. The seismic data acquired from complex environments usually have a low signal-to-noise ratio (SNR) and nonstationary random noise that makes it difficult to accurately restore seismic signals. For enhancing seismic signals and filtering nonstationary random noise, we propose a structure-adaptive nonlinear complex diffusion method (ANCD) based on the regularized complex shock diffusion (CSD) by exploiting the structure-adaptive diffusion coefficients. The proposed complex diffusion method makes use of the imaginary value which is generated by a complex diffusion process as a directional structure indicator to guide the diffusion coefficients, by cooperating with spatially variant structure factors associated with the eigenvalues and eigenvectors of the structure tensor. In this way, the structural-adaptive diffusion term of ANCD allows the diffusion process along seismic structures, and the resulting imaginary part in turn enables the shock term to enhance the seismic signals with steep dips and rapidly varying slopes. The proposed method is tested on the synthetic seismic data and field seismic data acquired from the forest belt and desert area. The results show that the ANCD achieves a superior tradeoff between suppressing complicated random noise and preserving the seismic structures compared with the state-of-the-art seismic denoising methods.
机译：在地震勘探中，有效地震噪声衰减以及地震信号保存是地震信号处理的关键问题。从复杂环境获取的地震数据通常具有低信噪比（SNR）和非间断随机噪声，使得难以准确地恢复地震信号。为了增强地震信号和过滤非间断的随机噪声，我们通过利用结构自适应扩散系数来提出基于正则化的复震扩散（CSD）的结构 - 自适应非线性复杂扩散方法（ANCD）。所提出的复杂扩散方法利用由复杂的扩散过程产生的假想值作为定向结构指示器来引导扩散系数，通过与与结构张量的特征值相关联的空间变体结构因素协作。以这种方式，ANCD的结构自适应扩散项允许沿着地震结构的扩散过程，并且由此产生的假想部分依次使得冲击术语能够增强具有陡坡的地震信号和快速变化的斜坡。该方法在从森林带和沙漠地区获得的合成地震数据和场地震数据上进行测试。结果表明，与最先进的地震去噪方法相比，ANCD在抑制复杂的随机噪声和保护地震结构之间实现了卓越的权衡。

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