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利用叠前CMP资料估计介质品质因子

DOI: 10.6038/cjg20130727, PP. 2413-2428

Keywords: 品质因子Q,衰减,WEPIF法,叠前CMP资料

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Abstract:

本文提出了一种利用叠前CMP道集资料估计介质品质因子的方法,同时提出利用地震道间有效信号的相干性估计层位信息的方法.首先采用具有4个待定系数的函数去逼近震源子波,利用黏弹介质中单程波传播理论推导出地震子波包络峰值处的瞬时频率(EPIF)与不同偏移距处走时的关系;其次利用该关系,外推出该同相轴零偏移距处的EPIF,用小波域包络峰值处瞬时频率法(WEPIF)结合层位信息估计Q值.合成数据的结果表明,EPIFVO法(子波包络峰值瞬时频率随偏移距变化)无边界效应,计算精度相对较高;将该方法用于实际资料算例,结果表明,衰减强弱与储层的吸收有较好的对应关系.

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