三维速度分析

本文依根象限速度分析原理提出一种新的求取速度参数公式。由于速度椭圆公式中包含有速度、方位角和倾角等三个参数，故至少需将三维ＣＤＰ面元分成三个以上的象限，再利用三个象限速度才能求出ｖ，ψ、α参数。

3-D velocity analysis

A new formula for estimating velocity parameters is advanced in the ligth of velocity analysis principle in quadrants. Velocity elliptic formula involves three pa-rameters :velocity v,azimuth and dip angle a;therefore,we need to divide one 3-DCDP bin into more than three quadrants then use three quadrant velocities to solve for v, and a. To improve velocity accuracy,we use the velocities in each quadrant to respectively estimate the fitting errors between theoretical and real time-distance curves in a certain perturbation scope. The velocity corresponding to the minimum fitting error serves as the central velocity in a quadrant that is then used to get final 3-D velocity parameters. The method produces accurate velocity efficiently.