【摘要】 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。更多还原

【Abstract】 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.更多还原