基于粘声介质的反Q滤波叠前深度偏移方法研究
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摘要
地层非弹性吸收衰减效应使得地震资料的中深层信号频带窄、能量弱,成像困难,因此需要对介质的非弹性吸收衰减进行补偿。在已有的非弹性吸收衰减补偿方法基础上,基于单程波方程,采用与品质因子和频率相关的复速度代替介质真实速度,在频率-波数域进行波场延拓算子推导,并对传播算子中的复根式进行精确展开,来提高延拓算子的精度,从而实现了双域叠前深度反Q滤波偏移,提高了偏移的精确度,有效补偿了由于地层非弹性吸收造成的振幅和频率损失。模型试算和实际资料处理表明,该方法具有一定的适应性和实用性。
引文
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