利用共聚焦点方法消除复杂的近地表效应

复杂的近地表效应会降低地震数据的质量,通常假设射线垂直地穿过近地表来消除其影响。共聚焦点方法把近地表效应当作成像问题的一部分来处理。依据等旅行时原理估算出波场的传播算子，在差异时移模板中进行算子更新，再用这些算子重建基准面。利用修正后的层析反演，把重建基准面后的数据校正到合适深度，得到近地表速度模型。对复杂的合成数据集进行处理，可消除复杂地表的影响，得到令人满意的叠加剖面。

Common focus point method for elimination of complex near surface effect

Complex near surface effect degrades the quality of seismic data Conventionally the effect is handled by assuming that raypaths travel vertically through the near surface. With common focus-point method, we treated the effect as part of imaging problem. Operators of wavefield propagation estimated by the principle of equal trav-eltime, which would be used for redatuming, were updated in differential time shift (DTS) panels. The reda-tumed data were then corrected to the proper depths. The correctness of the method was tested on synthetic data-set.