Comparison Between Post-Stack and Pre-Stack Lithofacies Prediction, A Case Study from Oilfield in Southwest of Iran

In the present study, pre-stack and post-stack seismic inversion methods are performed to estimate subsurface petrophysical properties from seismic data in an oilfield of Iran. Such methods are used to estimate subsurface property but the problem arises in deciding which method will provide more efficient and detailed information of the structures. The objective is comparison of post-stack and pre-stack inversion results in Litho-SI facies. The results show that both pre-stack and post-stack inversion methods produce subsurface property in similar way with high resolution. Although the pre-stack inversion method produces more petrophysical parameters, which are sensitive towards fluid and rock property, but the resolution is relatively poor compared to the post-stack inversion method. The inverted section and facie map extracted from post and pre-stack inversion indicates that the results for calcite, sandstone, shale and shaly sandstone are almost same, but for facies dolomite the results show local difference in some parts.

کلیدواژه ها:

Seismic data ، Pre-stack inversion ، Post-stack inversion ، Lithofacies ، hydrocarbon reservoir