一种叠加速度分析新方法

A new approach for stack velocity analysis

1. 中国地质大学,北京100083;2. 大庆石油管理局物探公司研究所,大庆163357

The research institute of Geophysical Corporation under Daqing Petroleum Administration Daqing 163357

本文依据速度分析原理及L₁和L₂ 范数的滤波特性,假设经过动校正的中心点道集中,任何一个时刻地震信号的采样值与炮检距平方满足一阶线性方程,提出了一种叠加速度分析新方法。该方法通过对沿着由t0 时间和叠加速度决定的双曲线延迟数据中提取的地震信号进行L₁和L₂ 范数混合滤波,来实现噪声和信号的分离。由此,我们可以估计信噪比和设计合适的速度检测因子,从而提高速度分析的精度。我们用实例验证了该方法的可靠性和实用性。

This paper presents a new velocity analysis method. On the basis of velocity analysis principle and filtering character of norm L₁ and L₂, the method assumes that seismic signals and square offsets comply with a certain one order equation at each time for gathers with moveout corrections. Signals and noises are decomposed by hybrid filtering of norm L₁ and L₂ from seismic data obtained along the hyperbolic curve determined by t0 times and stack velocity. Furthermore, both signal to noise ratio and velocity detection factors can be estimated. Thus the precision of velocity can be improved. The real data results show that the method is practical and feasible.