基于分数阶最优控制网络的复杂勘探随机噪声消减方法

杨文博; 盖永浩; 张文祥; 邓聪

doi:10.19509/j.cnki.dzkq.2022.0163

基于分数阶最优控制网络的复杂勘探随机噪声消减方法

doi: 10.19509/j.cnki.dzkq.2022.0163

中国海洋石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目:

广东省促进经济高质量发展专项（海洋经济发展）重点项目 GDNRC[2022]29

详细信息

作者简介:
杨文博(1983— ), 男, 工程师, 主要从事海洋地震资料采集和处理研究工作。E-mail: yangwb2@cnooc.com.cn

中图分类号: P618.13
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- 文章访问数: 415
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-28

Random noise reduction method of complex exploration based on a fractional optimal control network

CNOOC Zhanjiang Branch Company, Zhanjiang Guangdong 524057, China

摘要

摘要:
在实际勘探记录处理过程中，复杂随机噪声的出现严重影响了有效反射信息的提取，并对资料后续处理带来了不利影响。随着非常规油气资源开发，对勘探记录质量提出了更高的要求，常规方法在处理能力方面需要持续提升。为了解决复杂噪声消减问题，笔者将最优控制网络引入随机噪声消减领域。与传统的单一尺度消噪网络不同，FOC-NET具有分层结构，能够利用不同尺度信息并结合信息融合处理实现地震勘探数据潜在特征的高精度提取，克服了传统去噪网络单一尺度信息提取造成的有效特征损失问题。同时，在面对低信噪比勘探记录和弱反射同相轴时，多尺度特征交互方式同样可以有效提高噪声压制和信号恢复能力。合成记录和实际数据处理结果均表明，即使在低信噪比条件下，FOC-NET仍能有效地抑制随机噪声并准确重构出有效反射信息，极大提升勘探资料的质量。
- 地震勘探 /
- 随机噪声消减 /
- 低信噪比 /
- 卷积神经网络 /
- 最优控制网络 /
- 分数阶
Abstract:
In field seismic prospecting, the existence of complex random noise strongly influences the detection of effective reflected signals and imposes adverse effects on the subsequent process of the data. With the exploration of unconventional petroleum resources, high-quality seismic records are needed, and the performance of conventional methods in processing needs to be further improved. To solve this problem, a fractional optimal control network (FOC-NET) is utilized to cope with complex noise reduction. Unlike conventional DnCNN, FOC-NET has a hierarchical architecture. It can cope with the feature loss caused by a single-scale feature extraction strategy. Then, the potential feature of the analyzed data can be accurately captured in combination with the different-scale information. Notably, the multi-scale fusion capability can also improve the recovery of weak reflection events and complex noise attenuation. Both synthetic and field experimental results demonstrate that FOC-NET can effectively suppress random noise and restore the desired signals, even under low-SNR conditions.
- seismic exploration /
- random noise reduction /
- low-SNR /
- convolutional neural networks /
- fractional optimal control network /
- fractional

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图 1 FOC-NET网络结构

Figure 1. Network structure of the FOC-NET

下载: 全尺寸图片幻灯片

图 2 不同算法去噪结果及滤除噪声比较

a.合成含噪记录及叠加实际噪声; b~f.小波、带通、TFPF、EEMD、ED-NET、DnCNN和FOC-Net去噪结果

Figure 2. Comparison of denoising results and noise filtering ratios of different algorithms

下载: 全尺寸图片幻灯片

图 3 正演模型建模及含噪模拟记录构建

a.地层模型; b.纯净记录; c.叠加噪声; d.含噪记录

Figure 3. Forward modeling and noise simulation record establishment

下载: 全尺寸图片幻灯片

图 4 不同算法去噪结果及滤除噪声比较

a.合成含噪记录及叠加实际噪声; b~d.ED-NET、DnCNN和FOC-Net去噪结果

Figure 4. Comparison of denoising results and filtered noise of different algorithms

下载: 全尺寸图片幻灯片

图 5 实际记录1处理结果

a.实际含噪记录; b~d.ED-NET, DnCNN和FOC-NET处理结果和滤除噪声

Figure 5. Processing results of field data 1

下载: 全尺寸图片幻灯片

图 6 实际记录2处理结果

a.实际含噪记录; b~d.ED-NET, DnCNN和FOC-NET处理结果和滤除噪声

Figure 6. Processing results of field data 2

下载: 全尺寸图片幻灯片

表 1 正演建模参数

Table 1. Parameters of forward modeling

参数	设置
子波模型	Ricker子波, 零相位小波和混合相位小波
主频/Hz	15~30
速度/(m·s^-1)	500~7 000
道间距/m	20
采样间隔/ms	2

下载: 导出CSV

表 2 不同去噪方法SNR和RMSE比较结果

Table 2. Comparison of SNR and RMSE based on different denoising methods

处理前记录/dB	小波		带通		ED-NET		DnCNN		FOC-Net
处理前记录/dB	SNR/dB	RMSE	SNR/dB	RMSE	SNR/dB	RMSE	SNR/dB	RMSE	SNR/dB	RMSE
0	4.82	0.167	5.34	0.161	12.61	0.031	12.77	0.029	14.51	0.024
-2	3.30	0.204	4.70	0.171	12.05	0.032	12.16	0.032	13.97	0.026
-4	1.51	0.252	4.17	0.182	10.88	0.038	11.33	0.035	13.36	0.027
-6	-0.93	0.335	4.65	0.172	10.43	0.039	10.88	0.038	12.88	0.028
-8	-2.33	0.411	3.51	0.211	9.29	0.044	10.02	0.041	12.16	0.032
-10	-4.22	0.481	0.73	0.283	7.91	0.053	9.67	0.043	11.43	0.034

下载: 导出CSV

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