利用上行波进行VSP数据旅行时反演

利用双层剥层法同时对层速度和界面形态参数进行反演，并采用最小二乘法迭代求解。为了消除局部极值的影响，减少病态方程的产生，利用了 Ｍｏｎｔｅ Ｃａｒｌｏ 方法调整参数初始值。通过改变参数单位以均衡微分系数矩阵元素等措施，使这种反演方法具有较快的速度和较好的稳定性。对井底以上地层和井底以下地层均适用。

TRAVEL TIME INVERSION OF VSP USING UPWARD WAVE

In this paper, we use the double layer stripped method to perform the simultaneous inversion of velocity and interface shape parameters, using the leastsquare algorithm to solve the iterative equation. In order to avoid the infection of local extremum and to reduce the morbid equation, we use the Monte Carlo algorithm to adjust the initial model and get the equalization of Jacobi matrix elements by changing the parameter units. So the inversion process has good stability and high speed. This method will be used to invert the layers above the well bottom as well the layers below the well bottom.