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设地层的真速度随深度呈线性规律变化:V(Z)=V_0(1+k)Z,那未无论采用曲射线法作图,或计算均方速度V_σ以求动校正量,均需要事先求出V_0和k值。不但一个工区应有一个统一的平均V_0、k值,以便于剖面图的闭合和构造图的连接;而且一个局部构造在提供钻探井位时也需要有它特定的V_0、k值来进行速度的水平变化校正。一般地讲,每进行一口地震测井或声速测井,都需计算出该井的V_0、k值以便于相互比较和实际运用。因此,V_0和k值的计算是一项日常而重要的工作。目前介绍的V_0、k值求法一般都是先从垂直时距曲线(Z～t)利用公式V(Z)=Z/t
Assuming that the true velocity of the formation varies linearly with depth, V (Z) = V_0 (1 + k) Z, it is not necessary to plot the mean velocity V_σ Find the V_0 and k values. Not only a work area should have a uniform average V_0, k value in order to facilitate the closure of the profile and the connection of the structure diagram; and a local structure also needs to have its specific value of V_0, k for speed when providing the drilling well position Horizontal change correction. Generally speaking, for each seismic logging or sonic logging, we need to calculate the V_0, k values of the well for comparison and practical application. Therefore, the calculation of V_0 and k values is a daily and important task. Currently introduced V_0, k value method is generally first from the vertical distance curve (Z ~ t) using the formula V (Z) = Z / t