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4.2 偏移原理针对图4—14a 中地质(深度)剖面的倾斜反射面 CD。我们想要得到沿 ox 剖面的零炮检距剖面。当我们沿 ox 移动震源一检波器对(s,g)时,在位置 A 处记录倾斜反射面的第一个垂直入射波至。在本节的讨论中,我们假定恒定速度介质 v=1,因此时间和深度坐标可以互换。位置 A 处的反射波至在图4—14b 的零炮检距剖面上用点 C′来表示,当我们从 A 处向右移动震源一检波器对时,就相继记录来自倾斜反射面 CD 的垂直入射波至。在位置 B 记录到最后到达的波至,该位置在图4—14b 中用点 D′表示。
4.2 Offset Principle The oblique reflection plane CD for the geologic (depth) profile in Figure 4-14a. We want to get a zero offset profile along the ox profile. When we move the source-detector pair (s, g) along ox, record the first vertical incident wave at the inclined reflector at position A. In the discussion in this section, we assume a constant velocity medium v = 1, so time and depth coordinates are interchangeable. The reflected wave at position A is represented by the point C ’at the zero offset section of Figure 4-14b. When we move the source-detector pair from right to right, we record the signal from the tilted reflecting surface CD Vertical incident wave to. The last arriving wave arrives at position B, which is indicated by point D ’in Figure 4-14b.