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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.
The existence of complicated structures such as buried hills and steep steep terrain in the Bohai Sea area poses a great challenge to the seismic migration imaging.Based on the basic theory of Gaussian beam migration, the threshold is set according to the energy difference between the effective signal and the interference signal in the τ-p domain And then the beamforming process is effectively controlled and a beam migration imaging method suitable for low signal-to-noise ratio (SNR) actual data is realized.By processing the actual data of a survey area in the Bohai Sea and comparing the imaging results with Kirchhoff migration results It shows that the improved beam offset can not only effectively improve the signal-to-noise ratio of the imaging profile, but also can accurately image complicated structures such as buried hills, high steepness and so on.