摘要
渤海地区广泛存在潜山、高陡等复杂构造,给地震偏移成像带来巨大的挑战.本文基于高斯束偏移基本理论,根据有效信号和干扰信号在τ-p域的能量差异设定阈值进行滤波,从而对束形成过程进行有效控制,实现了一种适用于低信噪比实际资料的束偏移成像方法.通过处理渤海某探区实际资料,并将成像结果与Kirchhoff偏移结果对比表明:改进的束偏移不仅能够有效地提高成像剖面信噪比,而且能够较精确地成像潜山、高陡等复杂构造.
Complex subsurface structures such as buried hills and steep dips in the Bohai sea bring great challenges to seismic migrated imaging. Based on the basic theory of Gaussian beam migration（ GBM）, we have realized a beam migration method appropriate for real data with low signal-to-noise ratio（ S / N） by setting a filter to remove incoherent seismic events in τ-p domain.We have tested real data in the Bohai sea, and compared our imaging results with those produced by Kirchhoff migration.Numerical results show that this improved beam migration method not only enhances the S / N,but also accurately images complex structures such as buried hills and steep dips.
出处
《地球物理学进展》
CSCD
北大核心
2016年第3期1181-1186,共6页
Progress in Geophysics
基金
SWPI(Seismic Wave Propagation and Imaging)课题组对本项研究的支持
关键词
束偏移
海洋地震资料
潜山
高陡构造
Τ-P域
beam migration
marine seismic data
buried hills
steep dips
τ-p domain
