地形大起伏地区静校正

The static correction in large topographic undulation area

常规野外静校正方法总是在地表和基准面之间接垂直传播路径计算静校正量，在地表高差较大时这种做法会产生严重的误差。为有效消除这种误差，本文提出了一种静校正方法。它不仅在每一个CDP道集内考虑炮检距的变化，而且在每一道内实施动态的静校正。经理论模型验证，该方法所得到的静校正结果与在基准面上通过射线追踪方法所得到的理论结果相当吻合，两者的速度分析结果也非常接近。

In the ordinary field static correction method, the static values are always calculated on the basis ofthe vertical propatation path between the surface and the datum plane, which wtll cause serious errorswhen the surface elevation difference is large. In order to eliminate this kind of errors effectively, wepropose a static correction method in the paper. We not only take account of the offset variation in eachCDP gather, but also perform dynamic static correction for each trace. Thaoretical models verify that thestatic correction result obtained by the method coincides coasiderably with the theoretical result obtainedby ray tracing on the datum plane. Their velocity analysis results are also very close to each other.