叠前去噪技术在鄂尔多斯黄土塬区地震资料的应用

The application of pre-stack noise attenuation technology for seismic data of Soil Yuan area in Ordos basin

黄土塬地区特殊的地形、地貌条件对地震资料的激发和接收产生一些不利的影响,其表层被巨厚的黄土覆盖,对有效波的吸收衰减严重,信号主频低、分辨率不高,噪声干扰严重,信噪比低。这里针对黄土塬地震资料的特殊性,对该区某地震资料进行了分析,了解了原始资料有效波和噪音的主频、频带和分布规律,制定了针对性的去噪流程,选择合理的方法搭配,通过迭代和多域去噪,达到净化叠前数据的目的,提高了资料的信噪比。

The unusual geological conditions in the Soil Yuan area make the excitation and reception of seismic wave difficult and the Soil Yuan area is covered with thick soil which causes seismic wave to be seriously absorbed and attenuated which causes low main frequency and resolution.So seismic data in the Soil Yuan mix with large amounts of noise and s/n is low.This article analyses the main frequency and frequency band of seismic wave and noise as well as distribution and then makes specific flow chart of noise attenuation,choose reasonable methods to suppress noise through multi-domain and iterative ways so that we can purify seismic data and improve the s/n.