Prestack amplitude analysis methodology and application to seismic bright spots in the Po Valley, Italy
Prestack amplitude analysis methodology and application to seismic bright spots in the Po Valley, Italy
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叠前振幅分析方法及其在意大利波河谷地震亮点中的应用
DOI：
10.1190/1.1442822
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发表时间：
1990
期刊：
影响因子：
3.3
通讯作者：
A. Mazzotti
中科院分区：
文献类型：
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作者：
A. Mazzotti
分析了同一地震剖面上三个独立亮点的振幅随炮检距变化（AVO）特征。其中一个亮点来自含水砾石层，其他亮点对应于气体饱和的桑迪层。振幅分析包括从勘测中获得的整个入射角范围的反射;对于较浅的振幅异常，这些角度达到66°的值。将分析扩展到更长的炮检距旨在检测可能的临界角现象，以便在零炮检距反射的极性未知时减少不确定性。砾石层的反射具有这种特性。由于临界反射和首波的作用，其振幅呈现出先减小后突然增大的AVO趋势。与气体有关的异常具有非常不同的AVO特征，其中振幅随偏移距增加而增加。位于亮点上方的两个地震事件也被调查，以进一步...
The amplitude‐versus‐offset (AVO) characteristics of three separate bright spots on the same seismic section are analyzed. One of the bright spots results from a water‐bearing gravel layer, and the others correspond to gas‐saturated sandy beds. The amplitude analysis includes reflections from the entire range of incidence angles available from the survey; for the shallower amplitude anomaly, these angles reached values up to 66°. Extension of the analysis to longer offsets is aimed at detecting possible critical‐angle phenomena in order to reduce the uncertainty when the zero‐offset reflection’s polarity is unknown. The reflection from the gravel layer has this property. Its amplitude exhibits an initial decrease followed by a sudden rise in the AVO trend due to critical reflection and head waves. The gas‐related anomalies have a much different AVO characteristic, one in which the amplitude increases with offset distance. Two seismic events located above the bright spots were also investigated to further ...