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迭加或零偏移距剖面的偏移是以由地表观测到的波场值求取空间中的波振幅为依据的。通常,这种计算是由深度延拓来实现。我们介绍另一种偏移法。它是通过反时延拓完成偏移处理的。这种方法比现行的偏移方法优越,对速度变化很大的陡倾角构造特别有利。本方法已用适当的合成资料作了验证。
The offset of the superimposed or zero-offset profile is based on the wave amplitude in the space obtained from the observed wave field at the surface. Usually, this calculation is done by deep extension. We introduce another offset method. It completes the offset processing by inverse time extension. This method is superior to current offset methods and is particularly advantageous for steep-dip configurations that vary greatly in speed. This method has been validated using the appropriate synthetic data.