基于匹配追踪时频谱计算的砂体尖灭线检测方法

The method of thin sand pinch-out boundary detection via T-F spectrum based on matching pursuit

匹配追踪算法能够实现信号的自适应分解。首先研究了快速动态匹配追踪算法,实现了匹配追踪高分辨率时频谱计算,然后通过构建楔形砂体模型深入剖析了薄砂储层的时域和频域反射特征,发展了利用时频谱分量来指示砂体尖灭点位置的方法。该方法综合了薄层调谐能量和薄层反射向高频移动的特征,采用相对高频的瞬时谱分量的异常高值识别薄砂尖灭点,相比单独使用振幅属性的尖灭点检测方法精度有所提高。模型试算验证了利用时频谱分量来指示砂体尖灭点位置的方法识别薄层砂体尖灭点的有效性,在实际资料的薄砂尖灭识别应用中,该方法取得了较好的效果,有效地证实了其实用性和可靠性。

The adaptive decomposition of seismic signal can be performed by Matching pursuit algorithm. The fast dynamic matching pursuit algorithm is studied,and the computation of high resolution spectrum of seismic study. We analyzes the reflection characteristics in time domain and frequency domain through the wedge models - based for-warding, and then develops the method of detection of pinch - out boundary of thin spectrum component. The energy of thin layers＇ reflection moves to higher frequency, which is taken into tect the thin sand pinch -out point. Compared with the conventional method that only use the amplitude of seismic, the pro-posed method improves the accuracy of pinch -out point detection. Tests on models proves the validity of the proposed method for identifying the sharp vanishing point of thin sand layers. Finally,good results of pinch -out bounapplication strengthen the practicability and reliability of our method.