中值在地震资料处理中的应用

Application of median in seismic data processing

中国石化河南石油勘探局地质调查处,河南南阳 473132

Geologic Survey Company of Henan Pe-Prospecting Bureau, SINOPEC, Nanyang 473132 china

如何提高地震资料的信噪比,一直是地震资料处理的关键。分析中值在统计意义上的“稳定性”,利用这一特性以保留处于“中间位置的数值”,去除数学信号中的极值,使输出信号的信噪比得以提高。地震资料处理时,在炮集记录时间方向上使用中值滤波,可以剔除采集过程中产生的野值,提高单炮的信噪比。叠加时使用中值叠加,可以在空间方向上去除噪音,有效地提高叠加剖面的质量。所给出的实例说明了该方法的效果明显,且保真度较高。

It is always important to improve the S/N ratioof seismic data in seismic processing. Median is sta-tistically stable. Making use of this characteristic,we can keep the numbers in the medial position andremove the extreme numbers. The S/N ratio istherefore improved. During seismic data processing,we could use median filter in the time direction of shot-records to remove the abnormal values resultedfrom acquisition, and then use median stacking tosuppress the spatial noises. The effect of this methodis illustrated by examples.