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瞬时速度的引用要比利用层速度有更多的益处和更高的精度,它是分析岩性、预测油气层的重要手段之一。因此,研究瞬时速度剖面的实现方法是有实际意义的。我们利用1704型计算机,实现了瞬时速度剖面的计算和显示,具体做法如下: 1.精细处理速度谱。首先按事先给定的预测速度和扫描宽度进行扫描,尽可能排除多次反射和高速绕射的干扰。其次,要把根据本区已知速度变化规律求出的速度平均变化梯度,作为判断每两层之间所求的速度变化梯度是否合理的标准。例如,两层之间
The reference of instantaneous velocity has more benefits and higher precision than the use of layer velocity. It is one of the important means to analyze lithology and predict hydrocarbon reservoir. Therefore, it is meaningful to study the method of instantaneous velocity profile. We use the 1704 computer to achieve the instantaneous velocity profile calculation and display, as follows: 1. Fine processing speed spectrum. First of all, according to the given prediction speed and scan width to scan, to exclude as much as possible the interference of multiple reflections and high-speed diffraction. Secondly, we should take the average velocity gradient obtained from the known variation of velocity in this zone as a criterion to judge whether the gradient of velocity change between every two layers is reasonable. For example, between two floors