摘要
常规地震勘探中,复杂覆盖层会降低地下深处目标层的成像效果.虚震源法将下行波与对应的上行波进行互相关运算,使地表震源重建到地下检波器的位置,由此避开构建覆盖层的速度模型,改善了地震记录的质量.然而,传统的虚震源法是在时空域中进行的,受多次波、散射波及其他噪声干扰,重建的虚震源数据质量会降低.对此,本文结合小波互相关与小波阈值去噪法,将小波变换运用在虚震源法处理过程中,在小波域里进行互相关得到虚震源信号小波系数谱,然后进行小波阈值去噪.通过模拟实验证明,与传统虚震源法相比,这种做法提高了虚震源数据的质量.
In the conventional seismic exploration, the imaging effect of the target layer is reduced by complex overburden. Virtual source method cross-correlates down-going waves with the corresponding up-going waves to reconstruct the position of surface source to the position of the buried receiver location. So this approach doesn’t build the velocity model of overburden and it improves image quality. However, the traditional virtual source method, which is performed in the space-time domain, will make the quality of the reconstructed virtual source data degraded by multiple waves, scattered waves and other noise. This paper combines wavelet cross-correlation and wavelet threshold de-noising,applying wavelet transform to the process of virtual source method. The wavelet coefficients spectrums of the virtual source signal are obtained by wavelet cross-correlation. Then those spectrums are subjected to wavelet threshold de-noising. and virtual source signals are de-noised by threshold filtering in the wavelet domain. Compared with the traditional method, this method improves the quality of virtual source data.
作者
曾靖雯
韩立国
许卓
ZENG Jing-wen;HAN Li-guo;XU Zhuo(College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China)
出处
《地球物理学进展》
CSCD
北大核心
2018年第6期2507-2511,共5页
Progress in Geophysics
基金
国家自然科学基金项目(41874139)
国家重点研发计划资助(2016YFC0600301)联合资助
关键词
虚震源
小波变换
小波阈值去噪
virtual source
wavelet transform
wavelet threshold de-noising
