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A full offset elastic seismic inversion was conducted over the Abu Sir Field, Offshore Nile Delta, Egypt in an effort to resolve lithological and gas saturation uncertainties in a Pliocene gas accumulation prior to the drilling of an appraisal well. A significant risk in Pliocene clastic exploration and exploitation in the Nile Delta is the risk of residual gas yielding false "DHI's."Complicated hydrocarbon fill and leak models make it difficult to predict with confidence when an observed DHI will be the result of residual gas or commercial saturations of gas. A second risk in Pliocene accumulations is the impact of low net-togross thin bed intervals within an overall slope channel levee complex. An accurate assessment of the relative proportion of channel sand vs. thin bed reservoir is important as is an assessment of the net-to-gross of the thin bed package. The inversion project set out to differentiate not only channel sand vs. thin bed reservoir, but also to differentiate varying net-to-gross within the thin bed packages.The resulting inversion was unable to resolve the question of residual gas saturation, nor to differentiate net-to-gross within thin bed packages, but a simplified lithology classification system based on a "shale," "thin beds" and "sand" classification was employed and proved highly successful at predicting actually drilled lithologies in the AS-3 appraisal well. This resulting inversion volume was then used as the basis of the geocelluar model of the field used for resource estimation.

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