阿曼36、38区块低信噪比地震资料处理技术

由于地表和地震地质条件复杂,阿曼36、38区块地震资料品质较差.针对处理中存在的静校正、提高信噪比和多次波压制等3个关键问题,提出了有效的处理方案.采用层析静校正、交互迭代静校正和反射波剩余静校正较好地解决了研究区的静校正问题.采用叠前多域去噪剔除面波,去除线性干扰,衰减随机噪声,并综合使用叠后去噪、多项式拟合等技术,有效地提高了资料的信噪比.在分析多次波成因、准确解释一次波速度之后,串联运用F-K滤波、拉东变换和内切叠加等方法压制多次波,增强了深层资料的信噪比.

Technique for Low Signal-noise Ratio Seismic Data Process in Blocks 36,38 in Oman

Because of complicated conditions of surface and seismogeology, data quality is poor in Blocks 36 and 38 in Oman. In consideration of the problems of static correction, improvement of signal-noise ratio and suppression of multiple waves, effective processing schemes are presented.Static correction problem is solved by using the methods of static correction of tomographic inversion, interactive refraction static correction and residual static correction. Surface waves, linear interference and random noises are eliminated in multiple domains before stacking. Methods of post-stack noise removal and polynomial fitting are also used to further improve the signal to noise ratio. After analyzing the genesis of multi-wave and exactly interpreting the primary wave velocity, multi-waves are attenuated by methods such as F-K, Radon domain filter and inter mute stacking. Sequentially, the signal-to-noise ratio is improved for data from deep strata.