一种新静校正方法及其在黄土塬地震资料的应用

New seismic static method and its application to seismic data of loess tableland area

针对鄂尔多斯盆地西南部黄土塬地震资料严重的静校正问题,本文提出利用层析反演静校正,折射波静校正方法分别计算静校正量,按照地表一致性原则,将两种方法计算的炮点,检波点校正量各自分解为高频校正量和低频校正量,然后进行最优化组合,从而获得全新的炮点和检波点静校正量.鄂尔多斯盆地西南部黄土塬地区地震资料实际应用表明,应用本文方法计算的静校正量的地震剖面与单独应用层析静校正量或折射静校正量的地震剖面相比,其层位同相轴连续性和信噪比得到了很大的改善,从而证明本方法的正确可靠性.同时表明,本方法能够很好的解决本区静校正问题.

A new static correction method is proposed for the seriously static correction problem of seismic data of loess tableland area of southern Ordos basin. Firstly,statics are calculated based on tomographic inversion and refraction wave methods respectively.According to surface consistent rule,short wavelength and long wavelength statics are decomposed from shot and receiver statics respectively. And then shot and receiver statics are got from combination of better long wavelength static calculated by one method（ for instance,tomographic inversion method） and better short wavelength static calculated by the other method（ refraction wave method）. The real application of seismic data of loess tableland shows that the result obtained by the new method are better than those obtained by the method of tomography or refraction method alone. The continuity and signal to ratio of layers have been greatly improved by the new method which can solve the static correction problem of seismic data of loess tableland. The validity of this method is testified by comparison of the results.