论文详情
基于平坦海水表面假设的鬼波压制方法在起伏海水表面情况下鬼波压制效果不佳。为此,基于最小平方线性拉东反演去鬼波算法,反演得到海水表面处上行波场,正向和反向延拓海水表面处上行波场至检波器处,采用最小平方成像条件成像海水表面,以校正检波器实际沉放深度,消除起伏海水表面的影响,实现了基于起伏海水表面的鬼波压制。该方法考虑了起伏海水表面对鬼波压制的影响,改善了基于平坦海水表面假设的方法压制鬼波不完全的情况。数值模拟数据和海上实际拖缆数据测试结果表明,该方法能更好地压制鬼波,最大程度拓宽地震记录频带。
关键词：
Currently,the deghosting algorithms based on a flat sea surface assumption can not provide a robust deghsoing result,caused by the misestimation of sea surface reflection and ghost delay time.A new method of deghsoting has been developed by solving the least-square linear Radon equation.The up-going wavefield at the sea surface can be obtained and then extrapolate the up-going wavefield forward and backward to the receivers where a least-square imaging condition is applied so that the variation of the sea surface can be estimated.The effect of the variable sea surface on the ghosts can be taken into account by imaging the sea surface.The sea surface is then provided to the correction of the actual depth of the receiver.Finally,we compare the deghosting results using a flat sea surface and a variable sea surface.Less ghost residuals and reduced ringing artifacts are observed when deghosting was performed using a variable sea surface.Test results on synthetic and field data show that the proposed approach can better remove ghost wave and achieve the goal of broadening the bandwidth of seismic data.
国家高技术研究发展计划(863计划)项目(2014AA06A605)资助。