弯曲测线地震资料相干噪声压制  

Attenuation of coherent noise in seismic data coith crooked line geometry

作　　者：汪铁望 于相海 胡浩 刘明乾 周夏丽 

机构地区：[1]东方地球物理公司研究院长庆分院,西安710021

出　　处：《地球物理学进展》2010年第3期946-950,共5页Progress in Geophysics

摘　　要：引鄂尔多斯盆地,地表沟谷纵横,为形态奇特的黄土塬复杂地貌.高程变化剧烈,出露地表的岩性复杂.受地表条件的限制,采集资料大多采用弯曲测线方式施工,改善了激发接收条件,以获得信噪比高的地震资料,但是在单炮上会产生曲线型的相干噪声,在常规地震资料处理中,常规去线性的方法对于曲线型的相干噪声效果不佳,为解决这一问题,提出在T-X域将曲线型的相干噪声线性化,去噪后反变回去的方法.对理论数据和实际的地震资料的处理,相干噪声得到了很好的压制,资料的信噪比得到了提高.The Ordos Basin is featured by vertical and horizontal surface valleies, and the peculiar form of the complex topography of the Loess Plateau. Dramatic changes in elevation and complex lithology of exposed suface are present. Because of the surface conditions, in order to obtain high signal-to noise ratio of seismic data, crooked lines are used to improve the excitation and receive conditions. But curved coherent noise is resulted in shot gathers. In the conventional seismic data processing , the conventional approach is ineffective to the curved coherent noise. In order to solve this problem, we propose a method to make cured coherent noise linearized in TX domain. Tests on theoretical data and the actual seismic data processing show that coherent noise suppression is well realized and signal-to-noise ratio has been improved.

关 键 词：弯曲测线 相干噪声 线性化 视速度 

分 类 号：P631[天文地球—地质矿产勘探]