【摘要】 三维地震数据中一条检波线和与之垂直的炮线的所有地震道组成了三维地震数据的一个正交子集。一个正交子集就是一个三维单次覆盖数据体。在正交子集中,各种规则干扰,如面波、声波、折射以及由地面不均匀体产生的散射,在三维空间上,形成以震源或散射点为顶点的锥形体,线性噪音为从圆锥顶点辐射出的直线,具有恒定的视速度。三维F-Kx-Ky锥形滤波器的频率响应特征呈圆锥形,与线性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线性噪音和次生干扰。在正交子集里,共中心点距离缩减为炮点距和检波点距的一半,将三维叠后随机噪音压制技术应用到正交子集上,可有效缓解基于传统道集的叠前噪音压制因空间采样不足而引起的假频问题。实际资料的应用表明,正交子集压制噪音,比传统的炮检域有更好的去噪效果。更多还原

【Abstract】 Orthogonal subset is extracted from orthogonal geometry by collecting all traces that have a shot line (y direction) and a receiver line (x direction) in common,therefore the two lines are vertical bisectors. An orthogonal subset is single-fold coverage of a 3-D dataset. Orthogonal subset is extracted from orthogonal geometry by collecting all traces that have a shot line (y direction) and a receiver line (x direction) in common,therefore the two lines are vertical bisectors. An orthogonal subset is single-fold coverage of a 3-D dataset. The frequency-response charateristic of a 3D frequency-wavenumber velocity filter presents as a cone ,that dovetail nicely to the shap of the linear noise in the Orthogonal subset. In an orthogonal subset,the CMP intervals in both directions are half of the source spacing and the detector spacing. The random noise attenuation technology be can applied to orthogonal subset data ,that it can avoid the artificial effects of F-K filter method caused by the scarce of spatial sampling in pre-stack noise attenuation based on traditional trace gather. Real data results show that it has a good result in noise attenuation based on orthogonal subset.更多还原