Deep water reservoirs, in general, exhibit wide variation in facies characteristics because of their complex depositional processes and sedimentation pattern. Characterization of these reservoir facies with respect to their spatial extension and property distribution, during the appraisal phase particularly when the well control is sparse, is quite challenging and difficult.

This paper, through a case study, discusses about an approach where amplitude inversion and the inverted data volumes are used in the characterization and appraisal of a gas discovery in the lower slope deep-water Miocene channel-lobe complex in the east-coast of India that has only four drilled wells in 150 area. A combined inversion of three seismic angle stacks into P-impedance, S-impedance and Vp/Vs is performed and a Gas Indicator Index (GII) volume is generated which proves to be a reliable attribute for identification and mapping of reservoir facies. Using the GII and S-Impedance volumes in combination, the reservoir facies geometry and quality are mapped, that are observed to be consistent with the geological interpretation.

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