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本文介绍一种根据钻井中已知岩性和相应的声速测井求得的层速度,用概率论中的具叶斯公式算出不同井深各层速度值对应的泥岩比值的方法。当井的数量较多时,每一个泥岩比值所对应的层速度随深度的变化,就呈现出明显的规律性。这就是泥岩比值的层速度概率分布图。根据此图画出等间隔泥岩比值的层速度曲线,就可用作以地震勘探资料求得的层速度来计算泥岩比值的量板。
This paper presents a method to calculate the mudstone ratio corresponding to the velocity values at different depths by using the Hayes formula in probability theory, based on the layer velocities obtained from the known lithology and corresponding sound velocity logging in the well. When the number of wells is large, the layer velocity corresponding to each mudstone ratio changes obviously with the depth. This is the layer velocity probability distribution of shale ratio. Based on this plot, the layer velocity curve for equi-interval mudstone ratios can be used as a plate to calculate the mudstone ratio from the layer velocities obtained from the seismic data.