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动校正是地震数据处理的重要内容之一,采用常规动校正方法会产生拉伸畸变现象,在浅层和大炮检距处尤为明显,给地震资料的后续处理造成了不利影响。为此,分析了常规动校正方法产生拉伸畸变的原因,给出了动校正量可能的修正范围,提出了无拉伸畸变的动校正方法:1将近炮检距地震道进行常规动校正并叠加,得到标准道;2对地震道中每个时间样点的动校正量在给定的范围内进行修正扫描,并将常规动校正量加上修正量作为更新动校正量;3以待校正的时间样点为中心开时窗,使用更新动校正量进行动校正,并计算校正后时窗内数据与对应标准道数据的互相关系数;4将最大互相关系数对应的更新动校正量作为该样点的最终动校正量,以此实现无拉伸畸变动校正。模型数据测试和实际资料试处理结果显示了方法的正确性和有效性。
Dynamic correction is one of the important contents of seismic data processing. The conventional dynamic correction method will produce the phenomenon of tensile distortion, which is especially obvious at the shallow layer and the gun offset, which will adversely affect the subsequent processing of seismic data. Therefore, the reasons for the tensile distortion caused by the conventional dynamic correction method are analyzed. The possible correction range of dynamic correction is given. A dynamic correction method without tension distortion is proposed: Superimposed to get the standard road; 2 for each time point in the seismic trace of the dynamic correction within a given range of correction scan, and the regular dynamic correction plus the amount of correction as updated dynamic correction; 3 to be corrected The time sampling point is the center opening time window, and the updated dynamic correction amount is used for dynamic correction, and the cross-correlation coefficient between the corrected time window data and the corresponding standard path data is calculated. 4 The updated dynamic correction value corresponding to the maximum cross- Sample final move correction, in order to achieve non-stretch distortion correction. The results of model data test and actual data test show the correctness and effectiveness of the method.