消除P-SV波大静校正量的方法

由于低速带横向不均匀,横波速度很低,造成了P-SV转换波静校正量大且横向变化剧烈。一般说来,这种大的静校正量不可能通过一次校正完全消除。因此,本文采用了分步消除静校正量的方法:①基准面校正;②利用优化共接收点叠加道相干来确定短波长的静校正量;③利用"井旁参考道外推法"求取剩余静校正量。用该方法能较满意地解决P-SV波的大静校正量问题。

A method for removing high static moveouts of P-SV waves

Laterally-nonuniform weathered layer and very low velocity of shear wavescause high P-SV static moveouts which show severe lateral variation. Generally speaking, such high static moveouts can not be removed once; hence they only can the removed in the following steps: datum correction, short-wavelength statics using the values which are derived from the coherence of optimized common receivingpoint stack traces, and residual statics by extrapolation of the hole-side reference trace. This method can be applied to removal of high static moveouts of P-SV waves.