低速带底面起伏条件下常规低速带静校正误差及分析

AN ANALYSIS OF STATIC CORRECTION ERROR OF THE CONVENTIONAL LOW VELOCITY ZONE UNDER THE CONDITION OF ROLLING LOW VELOCITY ZONE

通过对典型低速带起伏理论地质模型的常规静校正误差的计算和分析 ,表明在低速带起伏条件下用常规静校正方法进行低速带静校正存在较大的校正误差 ,不仅在时间剖面上产生假的同相轴特征现象 ,而且在反演速度上引起不真实的纵、横向速度变化 ;证明了低速带静校正误差主要与炮检距、目标层埋深。

Based on calculation and analysis of conventional static correction error in the theoretical model for typical low velocity zone rolling terrain, this paper points out that adopting the conventional static correction method to proceed low velocity zone static correction under the condition of low velocity zone rolling terrain would lead to rather prominent correction error, which is expressed not only in generating spurious phase axis feature phenomenon, but also in causing wrong longitudinal and latitudinal velocity change in reversion velocity. It is also demonstrated in this paper that the low velocity zone static correction error is mainly related to such factors as the shot detector separation, the depth of target strarum, the curvature and form of the bottom boundary and the velocity difference between the low velocity zone and the bodrock.