Seismic inversion is carried out for reservoir prediction of the Jurassic carbonate. In seismic inversion there is an ambiguity seen in transforming impedance values into rock properties like porosity. At some point there is a sharp increase in porosity and low impedance observed which gives good indication of reservoir. But this picture is false as it arises from the presence of shale. Shale has excellent porosity and has low impedance like reservoir rock. The task here is to separate those points of reservoir from points which comes from non-reservoir (shale). To solve this ambiguity a technique is used in which gamma ray values are imbedded during porosity predication from impedance. This technique helps a lot in isolating the points (high porosity) which come from the shale and prevent from misleading.

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