PRESTACK AMPLITUDE ANALYSIS METHODOLOGY AND APPLICATION TO SEISMIC BRIGHT SPOTS IN THE PO VALLEY, ITALY

被引:18
作者
MAZZOTTI, A
机构
关键词
D O I
10.1190/1.1442822
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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. -from Author
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页码:157 / 166
页数:10
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