复杂区初至层析反演静校正

Static corrections by first breaks tomographic inversion in complex area

复杂区的静校正问题一直是地震勘探的“瓶颈”。而基于折射波理论的折射静校正方法,无论是假设前提还是实际应用效果,都不适用于地表剧烈起伏,速度纵、横向变化大的复杂区。为此本文推荐初至层析反演静校正方法,并将该法应用于野外采集和室内处理中,即利用地震记录中的初至旅行时求出介质的速度分布,提高了近地表建模的精度,在实际生产中取得了较好的效果。

The static corrections in complex area have been always the 'bottleneck' in seismic exploration. The refraction static correction based on refraction theory is not suitable for the complex area characterized by severely relief surface and rapid changed velocity both laterally and vertically in neither the hypothetic precondition nor the practical application effects. For that reason, the paper recommended the static correlations by first breaks tomographic inversion,and used the method for field acquisition and indoor processing.By using travel times of first breaks on seismic records to compute the distribution of velocities in the media, that improved the precision of near surface model building and achieved good effects in practical production.