叠加速度与剩余静校正量的迭代计算

The iterative computation of stacking velocity and residual statics

江汉油田物探处计算中心,潜江433100

Computer center of geophysical exploration division, Jianghan Oilfield, Qianjiang 433100

人工拾取的叠加速度对剩余静校量的计算有不利影响,同时叠加速度的调整与剩余静校量的计算也是相互影响的。文中介绍了“叠加速度与剩余静校正量的迭代计算”的基本原理、实现过程和效果分析。本方法以反射层为核心,在自动调整叠加速度的基础上精确计算叠加峰值线;以峰值线为中心运用子波加权叠加方法分步计算炮点、检波点剩余静校量,迭代计算过程中采用调整速度的异常分析和静校量控制性处理等手段;最后根据反射层的分类对叠加速度作结构性调整,从而使叠加速度的自动调整和剩余静校量的计算有机地结合在一起。

The stacking velocity picked up manually affects the computation of residual statics. There is an interaction between the modification of stacking velocity and the computation of residual statics. This paper introduces the principle and implementation of iterative computation of stacking velocity and residual statics and discusses its application effects. The method takes reflectors as the key link and computes accurately the stacking peak line based on automatic adjustment of the stacking velocity. With the stacking peak line, the residual statics of shots and receivers are calculated iteratively by weighted wavelet stacking. The abnormal analysis of velocity update and controlled processing are also used during the iterations. Finally, the stacking velocity is restructured according to the classification of reflectors. Thus the automatic update of the stacking velocity and the computation of the residual statics is combined organically.