短时窗地震信号谱分析方法

Seismic spectral analysis in short time windows

1. 西安石油学院信息中心, 西安710061;2. 西北工业大学

Information Center, Xian Petrolcum Institute, Xian City, Intercode: 710061

为适应短时窗地震信号处理, 原有的典谱估计方法已不能满足要求, 所以必须选择一种分辨率高、截断误差小的谱分析方法。经过用周期固法和Marple最大熵法对理论构造的地震信号和油田的实际地震信号进行处理, 发现Marple法的效果较好。用此法求得的功率谱, 高频失真少, 在短时窗下, 频谱具有使用价值。

The fact that classic spectral estimations are helpless in processing seismic signals within a short time window turns to a high resolution and less truncated error spectral estimation method.The comparison between the outcomes resultcd respectively form pcriodogram analysis and Marple maximum entropy spectral estimation which are applied to signal both from theoretical structures and oil fields reveals that Marple estimation is superior in less high-frequeney distortion for power spectrum. The Marple estimation therefore is of practical importance for short time windows.