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OALib Journal期刊
ISSN: 2333-9721
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一种带限稳定的反q滤波算法
Keywords: 反q滤波,时变带通滤波器,衰减补偿,高分辨率,gabor变换
Abstract:
？反q滤波是波传播的逆过程，可同时消除吸收和频散效应。gabor域反q滤波方法是以gabor变换谱代替向下延拓的波场，在对二维时频谱进行稳定的反q滤波处理后，再使用gabor逆变换重建时间域地震道。相对于反q滤波方法的分层实现，该算法可应用更精确的连续q模型，且不需对二维振幅补偿算子进行近似，其计算效率更高，反q滤波结果更准确。为了改善补偿效果且不放大环境噪声，在gabor域反q滤波过程中联合应用时变带通滤波器，该带通滤波器的高截频从某一时间处随旅行时沿双曲线轨迹变化，以适应衰减介质中信号带宽随旅行时的变化。理论数据测试和实际资料应用的结果均表明，联合时变带通滤波器的反q滤波算法对含噪地震数据是稳健的，可在保持信噪比的同时提高地震资料的分辨率。
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