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物探与化探  2015, Vol. 39 Issue (2): 322-326    DOI: 10.11720/wtyht.2015.2.18
  方法技术研究 本期目录 | 过刊浏览 | 高级检索 |
叠前逆时偏移去噪波场分离法与其他方法的比较
张书杰1,2, 薛霆虓1,3,4
1. 桂林理工大学 地球科学学院, 广西 桂林 541004;
2. 江西省地质矿产勘查开发局 赣东北大队, 江西 上饶 334000;
3. 桂林理工大学 广西矿冶与环境科学实验中心, 广西 桂林 541004;
4. 桂林理工大学 广西地质工程中心区重点实验室, 广西 桂林 541004
The wave field separation method in comparison with other methods in prestack reverse-time migration denoising
ZHANG Shu-Jie1,2, XUE Ting-Xiao1,3,4
1. College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;
2. Geological Party of Northeastern Jiangxi Province, Jiangxi Bureau of Geology and Mineral Resources, Shangrao 334000, China;
3. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, China;
4. Key Laboratory of Geological Engineering Center of Guangxi, Guilin 541004, China
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摘要 

基于双程波动方程的逆时偏移(RTM)具有原理简单、无倾角限制、具有可以适用于速度任意变化的模型,对各类波正确成像等优点,但采用互相关成像条件会产生严重的低频噪声问题。笔者分析低频噪声的产生机制后提供了一个有效的波场分离去噪方法,将震源和检波点波场分离成不同方向的单成波分量,只对有效路径上的分量进行互相关成像,从而达到去除噪声的目的。并通过模型测试对比了坡印廷矢量滤波、拉普拉斯滤波、波场分离滤波这三种方法的去噪效果,结果表明基于波场分离的去噪方法效果更好。

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Abstract

Two-way wave equation based on reverse time migration (RTM) has such advantages as simple principle,no angle restrictions,suitability for the model of arbitrary speed changes,and correct imaging for all kinds of waves.Nevertheless,the adoption of the cross-correlation imaging condition can produce low-frequency noise problems.Based on analyzing the mechanism of the low frequency noise,the authors put forward an effective wave field separation denoising method,in which the source and the receiver wave field are separated into different directions of one way wave component,and only cross-correlation imaging is conducted on the effective path of the component,so as to achieve the purpose of removing noise.The results of the model test and comparative study of the denoising effects of Poynting vector filtering,Laplasse filtering and wave field separation show that the wave field separation method is relatively effective in these three methods.

收稿日期: 2014-05-09      出版日期: 2015-04-10
:  P631.4  
基金资助:

广西自然科学基金项目 (2014GXNSFAA118306);桂林理工大学科研启动基金项目(002401003302)

通讯作者: 薛霆虓,桂林理工大学,副教授,xuetx@mail.ustc.edu.cn。
作者简介: 张书杰(1987-),男,硕士研究生,助理工程师,研究方向:地震波传播及成像。
引用本文:   
张书杰, 薛霆虓. 叠前逆时偏移去噪波场分离法与其他方法的比较[J]. 物探与化探, 2015, 39(2): 322-326.
ZHANG Shu-Jie, XUE Ting-Xiao. The wave field separation method in comparison with other methods in prestack reverse-time migration denoising. Geophysical and Geochemical Exploration, 2015, 39(2): 322-326.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2015.2.18      或      https://www.wutanyuhuatan.com/CN/Y2015/V39/I2/322

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