在频率域中求取薄地层的厚度

在表层地震地质条件单一和激发、接收条件稳定时,利用地震振幅信息可定量地计算薄地层的厚度。但是,实际上地震波很难满足这些条件。因此,本文根据地层模型研究结果,提出了利用频率信息计算薄地层厚度的方法。该方法是采用地震波频谱低频部分的振幅谱值来度量地层厚度,对地震波振幅并没有严格要求。文中还详细讨论了薄互层及不同子波对薄地层厚度计算可能引起的误差问题,讨论结果证明,该方法是可行的。

Calculating thin-bed thickness in frequency domain

Thin-bed thickness can be quantitatively calculated by using amp- litude information when the seismic waves were recorded in simple sur- face seismic-geological condition and stable shot-receiving condition. Howevr,Seismic waves are rarely recorded on such ideal conditions. A new method for calculating thin-bed thickness with the use of fre- quency information is proposed as a result of thih-bed model research This method uses amplitude spectrum values of low frequency contents in seismic frequency spectrum to determine bed thickness,and needs no special requirement for seismic amplitude.The thin-bed thickness error is minutely analysed which may be caused by thin interbedding and different wavelets.This method is proved feasible.