海底电缆Z分量横波噪音特征分析及衰减方法

发布时间：2018-04-06 03:15

本文选题：海底电缆　切入点：Z分量　出处：《中国海上油气》2017年03期

【摘要】：在海底电缆(OBC)多分量地震资料的处理中,陆检Z分量中除面波干扰外,还存在一种难消除的横波侧漏干扰噪音,这种横波噪音具有矢量性、振幅强、频带窄、相速度低的特点,并且在十字交叉排列的共检波点道集上表现为三维锥形特征。针对这种横波噪音特征,结合地震采集施工特点,提出在十字交叉域共检波点道集上的三维小波变换锥形滤波去噪方法。该方法通过小波变换,采用局部模拟噪声,仅针对干绕波存在区域内进行,回避了传统方法如F-K滤波等所带来的有效信息丢失问题,而且进行自适应的减法运算消除干扰,增强了去噪的保真度,实现了真正意义上的针对性去噪处理。该方法在渤海某区块实际资料的处理应用中取得了很好的噪音衰减效果,极大地提高了资料的信噪比。
[Abstract]:In the processing of multi-component seismic data of submarine cable OBC, besides surface wave interference, there is also a kind of S-wave side leakage interference noise which is difficult to eliminate in the Z component, which is characterized by vector, strong amplitude, narrow frequency band and low phase velocity.And the cross-arranged cross-arranged common detection point gathers show three-dimensional conical features.Based on the characteristics of shear wave noise and seismic acquisition construction, a three-dimensional wavelet transform conical filtering method for de-noising in cross cross region is proposed.In this method, wavelet transform and local simulated noise are used to avoid the problem of information loss brought by traditional methods, such as F-K filter, and adaptive subtraction is used to eliminate interference.The fidelity of denoising is enhanced, and the real targeted denoising is realized.The method has achieved a good noise attenuation effect and greatly improved the signal-to-noise ratio (SNR) of a certain block in Bohai Sea.
【作者单位】：中海油田服务股份有限公司物探事业部;
【基金】：国家高技术研究发展计划(863计划)“深水高精度地震勘探系统成套化研制(编号:2012AA09A211)” 中国海洋石油总公司“十二五”科技重大项目“海上开发地震技术集成及应用研究(编号:CNOOC-KJ125 ZDXM06 LTD-10-KFSC-14)”部分研究成果
【分类号】：P631.46

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