非纵测线地震资料相干噪声压制

Coherent noise attenuation in broadside seismic data

(CNPC东方地球物理公司研究院长庆分院,陕西西安710021)

Liu Mingqian,Changqing Branch,BGP,CNPC,Xi’an 710021,China

在鄂尔多斯盆地黄土塬区采用非纵测线法采集的地震资料中存在很强的相干噪声，其同相轴表现为双曲线特性，应用常规噪声压制方法无法达到预期效果。为此，采用T-X域时差变换滤波技术，即在T-X域内将曲线型相干噪声线性化，通过视速度差异去除噪声，从而达到压噪目的。实际资料处理结果表明，该方法能有效压制噪声，增强地震反射同相轴的连续性，提高地震资料的信噪比，改善地震资料品质。理论模型和实际资料的处理结果均显示了这种方法的可行性和有效性。

In the loess area of Ordos Basin,strong coherent noise exists in the broadside seismic data,its event shows hyperbola feature,which cannot ideally processed by conventional noise suppressing method.Therefore,moveout transform filtering method in T-X domain was adopted,which linearized the curved coherent noise in T-X domain,and remove noise by the contrast of apparent velocity.Actual data processing result shows that the method can effectively suppresses noise,enhances the continuity of reflection events,and improves the S/N of seismic data.Model testing and actual data application both indicates the flexible and effectiveness of the method.