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倾角时差校正实际上是一种偏移技术。与常规偏移一样,它可以用多种方法来实现。本文基于τ-p变换原理,“爆炸反射面”假说,以及σ函数的性质,提出一种扩展τ-p变换。在这种变换中,信号并非按倾斜直线叠加,而是沿着曲线进行叠加。其优点在于等炮检距剖面可作任意分割,独立地进行扩展(τ,p)变换的计算。对几种模型试算的结果表明,地震记录在经过与倾角无关的正常时差校正之后,再进行一次与倾角有关的倾角时差校正,可以得到可靠的自激自收道,实现同相叠加。从而提高了叠加效果,满足偏移的要求。
Tilt time difference correction is actually a shift technique. As with regular offsets, it can be done in a number of ways. Based on the theory of τ-p transformation, the hypothesis of “explosive reflection surface” and the properties of σ function, this paper proposes an extended τ-p transform. In this transformation, the signals are not superimposed on a slanted straight line but superimposed along a curve. The advantage is that the iso-offset section can be divided arbitrarily and the expansion (τ, p) transformation can be calculated independently. The results of trial calculation on several models show that after the seismic record corrects the normal time difference unrelated to inclination, a tilt-angle-dependent time difference correction can be performed to obtain a reliable self-excitation and self-absorption, achieving the same-phase superposition. Thus increasing the superimposed effect to meet the requirements of offset.