基于高斯束偏移的鬼波压制

Deghosting with Gauss beam migration

对于海洋地震数据,鬼波严重干扰了一次波,导致分辨率下降,甚至会产生虚假同相轴。本文首先给出共炮点道集高斯束偏移算法;然后在偏移公式中加入炮点和接收点的鬼波补偿算子,并研究稳定求解的方法,以达到消除鬼波影响的目的;最后通过数值试验验证了方法的可行性和准确性。结果表明,鬼波压制后的一次波偏移剖面同相轴连续性增强,分辨率提高,有利于后续的解释和反演。

In marine seismic data,the ghost contaminates primary waves,reduces data resolution,and sometimes even produces false events.Ghost removal during migration for better geological interpretation is one of the challenges in marine seismic exploration at present.In this paper we propose a deghosting approach with Gauss beam migration.Firstly,the Gaussian beam migration algorithm of common shot gathers is put forward.Then compensation terms for source and receiver ghosts are added to the migration formula.At the same time,an appropriate algorithm is given to ensure the stability in order to compensate ghost effects.Finally,numerical experiments demonstrate the feasibility and effectiveness of the proposed approach.After deghosting,the primary wave migration is achieved and data resolution is improved,which is favorable for subsequent interpretation and inversion.