Seismic interpretation of water saturation based on reflectivity transforms ///

Two rock-property transforms combined with an AVO thin-bed response allow for improved water-saturation estimation. A seismic interpretation technique is introduced that combines near- and far-angle amplitude maps to yield a map whose values are estimates of NI. The NI difference between the prospect and its equivalent down-dip wet reservoir leads to the prediction of the pore fluid and water saturation (SW). The two, new rock-property relationships are the Lithology and Pore-Fluid Transforms. The first relates the lithology of the sand reservoir and its encasing shale to the slope that is derived from Amplitude-Versus-Offset (AVO) analysis. The second transform relates the AVO-derived intercept (NI) to the pore fluid. By combining the lithology transform with the AVO thin-bed response, NIHYDRO values for the upper interface of the reservoir are predicted, regardless of the thickness, porosity, cementation, encasing shale properties, etc. The prospect is tested for different SW. Each SW test requires two maps.

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