一种切实可行的转换波静校正方法

由于横波的低速带厚且不均匀，转换横波速度又比较低，因此转换波静校正量大且横向变化剧烈。针对这种情况提出一种简单又易于实现的转换波静校正方法。根据多分量微测井资料求取低速层纵、横波平均速度比，利用纵波检波点静校正量和该速度比来求取转换波长波长静校正量。在动校炮集上拾取较清楚的反射层时间，再通过拟合抛物线时间与实际拾取反射层时间的差来求取转换波短波长静校正量。实际数据处理表明，该静校正技术能解决转换波静校正问题，转换波记录质量得到了明显提高。该方法已经用于川西三维三分量转换波处理，取得了较好的效果。

A Feasible Method for Converted Wave Static Correction

The thick and asymmetrical low-velocity belt of shear wave as well as low velocity of converted shear wave results in a great deal of converted wave static corrections and smart variations. This paper proposes a simple and feasible method for the converted wave static correction. The average velocity ratio of P-wave and S- wave is obtained by multi-component micro logging data. The converted wave long wavelength static correction is computed according to P-wave receiver statics and the ratio. The converted wave short wavelength static correction is gained by the difference between the fitted parabola time and the pieked up reflection time through picking up clear reflection time on the dynamic correction shot gathers. The real data processing shows that this method can he used to solve the problem of converted wave static correction, and remarkably improve the quality of the converted wave records. The method has been applied to the 3D3C data processing in western Sichuan and good results have been obtained.