【摘要】 位于郯庐走滑断层下降盘的旅大A构造由于受到多种构造运动影响,导致断面附近地层偏移归位困难,普通叠前时间偏移处理及叠前深度偏移处理结果不能满足勘探工作的需要,因此选用高斯射线束(GBM)叠前深度偏移方法对本构造进行叠前深度偏移处理。本文在确定了射线束偏移原理在高陡地层处理方面优势基础上,从去噪声,去多次波,各向异性速度场建模等三个主要步骤说明了该方法针对本构造的有效性。通过处理结果与叠前时间偏移、克希霍夫叠前深度偏移处理结果剖面对比,GBM法叠前深度偏移使大断层断面归位清晰,地震轴连续性提高,多次波得到有效抑制。验证了GBM法叠前深度偏移在偏移成像处理方法中的优势,为采用该方法处理具有相似特征的构造提供了参考依据。更多还原

【Abstract】 Located at thrownside of Tan-lu strike slip fault,the imaging of Lyuda A structure’s stratum is always the hard work as multiple impacts of tectonic movement,traditional PSTM and PSDM can’t satisfy the exploration need as the structure joining with liao dong salient of high-steep which makes the seismic data migration more complex,so GBM(Gaussian beam migration),a new method of beam migration,for its high quality on the seismic imaging aspect is imported to processing this block.As a new migration method,it has the advantage on processing high-steep horizon;this article elaborates three key steps of GBM migration flow:multi-time waves removed,anisotropy velocity field model established,amplitude-preserved etc.With the contrast of the profiles of the traditional PSTM&PSDM,GBM migration method performances better on improving S/N of seismic profile,enhancing seismic axis continuity,making cross section more clearly,and pressing the multi-time waves etc,also the result can be a proof of the good performance on the similar structures sharing the same feature by using the method in this structure.更多还原