Quantifying uncertainties in attenuation estimation at methane-hydrate-bearing zones using sonic waveform logs
Quantifying uncertainties in attenuation estimation at methane-hydrate-bearing zones using sonic waveform logs
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DOI：
10.1190/geo2012-0495.1
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发表时间：
2013-09
期刊：
影响因子：
3.3
通讯作者：
Hiroyuki Suzuki;J. Matsushima
中科院分区：
文献类型：
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作者：
Hiroyuki Suzuki;J. Matsushima
由于声波波形资料地震波衰减估计方法尚未完全成熟，使声波波形资料地震波衰减估计的应用受到限制。虽然中值频移方法被认为是有效的和强大的传统的谱比方法相比，我们证明了中值频移方法强烈依赖于参考数据下的较低的信噪比。我们修改了现有的中值频移方法，不依赖于任意选择一个参考值，并量化衰减估计的不确定性。此外，我们暗示了用于更稳定的衰减分析的接收器对的最佳选择。我们的数值实验支持所提出的方法的优点。虽然我们的主要发现，通过应用所提出的方法在甲烷水合物含沉积物几乎是一致的，与过去的现场声波测井测量，我们发现一些差异的幅度衰减值相比，现有的S…
ABSTRACTApplication of seismic attenuation estimation using sonic waveform data is limited because the estimation methods have not yet been fully developed. Although the median frequency shift method is considered to be effective and robust compared to the conventional spectral ratio method, we demonstrated that the median frequency shift methods strongly depend on reference data under lower signal-to-noise ratios. We modified an existing median frequency shift method not to depend on arbitrarily choosing a reference value and to quantify the uncertainties in attenuation estimation. Furthermore, we implied the optimum selection of receiver pairs used for more stable attenuation analysis. Our numerical experiments supported the advantage of the proposed method. Although our main findings by applying the proposed methods in methane hydrate-bearing sediments are almost consistent with past field sonic logging measurements, we find some differences in the magnitude of attenuation values compared to existing s...