ZL沙坝区强噪声,低信噪比地震资料的处理方法

常规地震处理一般要求在噪声较弱、信噪比较高的资料上进行,而在 ZL 沙坝区获得的是强噪声、低信噪比资料,按照一般常规方法处理,难度大、成功率较低。经过多次试验,最终获得了可用于地震资料解释的高信噪比剖面。其主要做法是:①精确求取野外静校正量;②采用线性动校正结合f-k 滤波,消除浅层折射干扰;③作振幅补偿、动校正组合、相干和高精度叠加,提高剖面信噪比。

Processing methods for low signal/noise ratio seismic data in ZL sandbar area.

Routine seismic data processings are only for the seismic data whose signal/ noise ratio is high enough.Seismic data in ZL sandbar area have low S/N ratio,so routine data processing methods don't work well.But many experiments resulted in high S/N seismic sections which can be well used in seismic data interpretation.In data processing,we took measures in three fields:(1)estimation of field statics data, (2)shallow refraction noise removal using linear dynamic correction and f-k filter- ing,and(3)improving the S/N ratio of seismic section with the use of amplitude compensation,beam steering,coherency and high accuracy stacking.