一种由叠加速度转换为平均速度的方法

根据地震勘探原理，以二层楔型模型和近似叠加速度求值公式为基础，提出了一种由速度谱求取平均速度或层速度的具体方法，并以二层楔形及五层楔形模型为例，计算其层速度、平均速度与正常时差速度的误差，结果表明其误差较小，完全可以满足地震资料解释的要求。通过实际应用以及与钻孔标定的平均速度的对比验证，表明该方法对于煤田地震勘探是适用的，特别是该方法可以直接求出沿界面法线方向的平均速度，提高时深转换的精度。

A Method for Transforming Stacking Velocity into Average Velocity

Based on the two-layered wedge model and approximate stacking velocity evaluation formula, a concrete method for calculating the average velocity or interval velocity from the velocity spectrum is presented on the basis of seismic exploration principle. To take two- and five-layered wedge models as examples, calculated interval velocity, average velocity and normal moveout velocity errors, results demonstrated that they are rather small, can fully satisfy seismic data interpretation requirements. The contrast of practical application and drilling calibrated average velocity has validated that the method is applicable to the coalfield seismic exploration. Especially, this method can calculate average velocity directly along the interface normal direction, and it is beneficial to enhance the precision of time-depth conversion.