The impact of common-offset migration on porosity estimation by AVO inversion
The impact of common-offset migration on porosity estimation by AVO inversion
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DOI：
10.1190/1.1444965
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发表时间：
2001-05
期刊：
影响因子：
3.3
通讯作者：
A. Buland;M. Landrø
中科院分区：
文献类型：
--
作者：
A. Buland;M. Landrø
The impact of prestack time migration on porosity estimation has been tested on a 2-D seismic line from the Valhall/Hod area in the North Sea. Porosity is estimated in the Cretaceous chalk section in a two‐step procedure. First, P-wave and S-wave velocity and density are estimated by amplitude variation with offset (AVO) inversion. These parameters are then linked to porosity through a petrophysical rock data base based on core plug analysis. The porosity is estimated both from unmigrated and prestack migrated seismic data. For the migrated data set, a standard prestack Kirchhoff time migration is used, followed by simple angle and amplitude corrections. Compared to modern high‐cost, true amplitude migration methods, this approach is faster and more practical. The test line is structurally fairly simple, with a maximum dip of 5°; but the results differ significantly, depending on whether migration is applied prior to the inversion. The maximum difference in estimated porosity is of the order of 10% (about...
