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反射地震资料的速度分析在石油勘探中已经流行到这种程度,以致它现在成了一般数字处理程序的一种重要方法。这种分析的缺点是其计算费用高(时间长),这是由于需要一台数字计算机进行许多数学计算以提取广泛的速度信息而造成的。提出的算法对简单的相加型速度分析能确保计算费用(时间)降低到原有的十分之一左右,而对精度只有些微损失。算法的效用被一些路易斯安纳的岸外地震资料所证明,成果的对比表明它们与普通的速度分析方法几乎是一致的。算法基于下述慨念:正常时差的时间移动可以在零炮检距时间的一个相当宽范围精确地应用于共反射点道集合,而不仅仅在一个零炮检距时间上。但是均方根速度与时差型式的关系对每个应用是不同的。把一种均方根速度与某一零炮检距时间相联系的特殊关系,将在数字计算机上对同样的时差时间延迟型式以数值模拟研究来近似。
The speed analysis of reflected seismic data has become so popular in petroleum exploration that it is now an important method of general digital processing. The disadvantage of this analysis is that it is computationally expensive (for a long time) due to the need for a digital computer to perform many mathematical calculations to extract a wide range of velocity information. The proposed algorithm reduces the computational cost (time) for a simple additive velocity analysis to about one-tenth of the original, with only a slight loss of accuracy. The utility of the algorithm is corroborated by some of Louisiana’s offshore seismic data and the comparison of the results shows that they are almost identical to the common velocity analysis method. The algorithm is based on the idea that the temporal shift of normal time difference can be accurately applied to the set of reflection points at a fairly wide range of zero offset times, not just at a zero offset time. However, the relationship between rms speed and time difference pattern is different for each application. The special relationship that relates a root-mean-square velocity to a fixed zero offset time will be approximated by a numerical simulation on a digital computer for the same type of delay time delay.