Accurate interval Q-factor estimation from VSP data
Accurate interval Q-factor estimation from VSP data
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DOI：
10.1190/geo2011-0270.1
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发表时间：
2012-04
期刊：
影响因子：
3.3
通讯作者：
E. Blias
中科院分区：
文献类型：
--
作者：
E. Blias
用地震品质因子Q量化的非弹性衰减对地面地震反射数据有相当大的影响。提出了一种利用近炮检距VSP资料估算层间Q值的新方法，该方法基于目标函数最小化，该目标函数最小化度量了累积Q值估算值与通过层间Q值计算值之间的差异。为了计算间隔Q，我们使用提供合理Q值的所有接收器对。为了估计两个接收器电平之间的Q，我们使用了将不同电平的幅度联系起来的等式，并且可以提供比频谱比方法更准确的Q值。为了改进依赖于走时的区间Q估计，我们在频域中使用了一种高精度方法来确定时移。应用这种方法对真实的数据表明，Q估计值与测井数据之间存在合理的对应关系。
ABSTRACTInelastic attenuation, quantified by Q, the seismic quality factor, has considerable impact on surface seismic reflection data. A new method for interval Q-factor estimation using near-offset VSP data was based on an objective function minimization measuring the difference between cumulative Q estimates and those calculated through interval Qs. To calculate interval Q, we used all receiver pairs that provided reasonable Q values. To estimate Q between two receiver levels, we used the equation that links amplitudes at different levels and could provide more accurate Q values than the spectral-ratio method. To improve interval Q estimates, which rely on traveltimes, we used a high-accuracy approach in the frequency domain to determine time shifts. Application of this method to real data demonstrated reasonable correspondence between Q estimates and log data.