基于正交子集的锥形滤波去噪技术研究
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摘要
三维地震数据体中的面波、声波、折射波等噪音,在三维空间上形成以震源为顶点的锥形体,在水平切片上显示为圆形,在纵向切片上显示为线性。三维★K★Ky锥形滤波器的频率响应特征呈圆锥形,与噪音在正交子集道集上的分布形状吻合,三维F-Kx-Ky锥形滤波可以很好压制这类特征的噪音。根据面波在正交子集中表现特征稳定特征,研究了一种基于正交子集的锥形滤波去噪技术。实际应用表明,在正交子集上利用锥形滤波压制面波噪音,比传统的压制面波方法有更好的效果,且更大程度的保留了有效信号的原貌。
Surface waves,sound waves,refraction noise in 3D seismic data exist on the three-dimensional space for the vertex of the cone.They display as a circle on a horizontal slices,in the vertical slice it is displayed as linear.Threedimensional F-K_x-K_y,conical filter frequency response characteristics are consistent with the shape of the distribution of noise in the orthogonal subset of gathers,three-dimensional F-K_x-K_y,conical filter can be very good to suppress such characteristics.Performance characteristics of surface wave concentrated in the orthogonal subset is stable,and denoising technique based on orthogonal subset of the cone filter is studied.Practical applications shows that using a cone filter to suppress the surface wave noise in the orthogonal subset obtains better results than the traditional suppression of surface wave method,retains the original appearance of the effective signal.
Surface waves,sound waves,refraction noise in 3D seismic data exist on the three-dimensional space for the vertex of the cone.They display as a circle on a horizontal slices,in the vertical slice it is displayed as linear.Threedimensional F-K_x-K_y,conical filter frequency response characteristics are consistent with the shape of the distribution of noise in the orthogonal subset of gathers,three-dimensional F-K_x-K_y,conical filter can be very good to suppress such characteristics.Performance characteristics of surface wave concentrated in the orthogonal subset is stable,and denoising technique based on orthogonal subset of the cone filter is studied.Practical applications shows that using a cone filter to suppress the surface wave noise in the orthogonal subset obtains better results than the traditional suppression of surface wave method,retains the original appearance of the effective signal.
引文
[1]张昌君,曲良河,吕功训,等.多频带消除地滚波的方法[J].石油大学学报.1997.21(5):13-15.
[2]钱荣钧.地震波的特性及相关技术分析[M].北京:石油工业出版社,2008:104-106.
[2]钱荣钧.地震波的特性及相关技术分析[M].北京:石油工业出版社,2008:104-106.
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