DAS seismic signal recovery with non-uniform noise based on high-low level feature fusion model

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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Abstract

Distributed Acoustic Sensing (DAS) is an effective exploration technology for acquiring Vertical Seismic Profile (VSP) data due to its characteristics of high-density collection and strong environmental adaptability. However, DAS-VSP is susceptible to various noises that distribute non-uniformly in both t-x and frequency domains. Existing denoising methods generally adopt single feature-extraction mechanisms (e.g. local convolutional operation or long-distance attention calculation), which are not sufficient for non-uniform feature extraction. Therefore, leveraging the advantages of Convolution (Conv) and Transformer, we propose a high-low level feature fusion model for DAS signal recovery. This model comprises three modules: low-level feature extraction (LFE), high-level feature extraction (HFE), and signal recovery (SR). First, LFE utilizes a Conv layer to extract the basic features, including energy, attributes, and fuzzy contours. The Conv utilizes small kernels to fitter the effective signal feature and introduce spatial information for the following layers. Second, HFE is the core module of the network to extract rich high-level features, such as sharper waveform features and high-dimension representation features. HFE consists of the Swin-Transformer blocks and the Conv blocks. The Swin-Transformer blocks utilize cross-window attention to extract the features between the windows and shift the window to continue recognizing the global features. Then, the Conv blocks further filter and enhance the high-attention features. The cross-use of these two blocks realizes the extract-enhance-extract-enhance process. Finally, the SR module employs a residual connection to create a direct mapping to add the low-level features to the last layer, achieving the fusion of the low-level and high-level features. Through the fusion, more complete and detailed features can be used to improve the accuracy of the recovering weak signals. The design of our model can combine long-distance and local detailed information to extract rich high-low level features, facilitating the recognition of weak signals and non-uniform noise in complex geological structures.

基于高低电平特征融合模型的非均匀噪声 DAS 地震信号恢复
分布式声学传感(DAS)具有高密度采集、环境适应性强等特点,是获取垂直地震剖面(VSP)数据的有效勘探技术。然而,DAS-VSP 易受 t-x 和频率域非均匀分布的各种噪声的影响。现有的去噪方法一般采用单一的特征提取机制(如局部卷积运算或远距离注意力计算),不足以满足非均匀特征提取的要求。因此,我们利用卷积(Convolution)和变换器(Transformer)的优势,提出了一种用于 DAS 信号恢复的高低级特征融合模型。该模型包括三个模块:低层特征提取(LFE)、高层特征提取(HFE)和信号恢复(SR)。首先,LFE 利用 Conv 层提取基本特征,包括能量、属性和模糊轮廓。Conv 利用小核来拟合有效的信号特征,并为后续层引入空间信息。其次,HFE 是网络的核心模块,用于提取丰富的高级特征,如更清晰的波形特征和高维表示特征。HFE 由 Swin-Transformer 模块和 Conv 模块组成。Swin-Transformer 模块利用跨窗口关注来提取窗口之间的特征,并移动窗口以继续识别全局特征。然后,Conv 模块进一步过滤和增强高关注度特征。这两个模块的交叉使用实现了提取-增强-提取-增强的过程。最后,SR 模块利用残差连接创建直接映射,将低层次特征添加到最后一层,实现低层次特征和高层次特征的融合。通过融合,可以使用更完整、更详细的特征来提高恢复微弱信号的准确性。我们设计的模型可以将长距离信息和局部细节信息结合起来,提取丰富的高低层次特征,便于识别复杂地质结构中的微弱信号和非均匀噪声。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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