The Neelam field, located in Western offshore India, is a heteregeneous limestone reservoir of Middle to Late Eocene age with a lack of well defined layering, variation in lithofacies and early high water cut behaviour. Detailed characterization of the reservoir was needed to understand its complex nature in order to arrest the declining production trend.

An integrated reservoir modelling technique was used in order to shorten the E&P interpretation cycle, manage and integrate a large amount of geoscientific data and provide an inbuilt link between the static reservoir model and its dynamic activation using numerical simulation. The available data included well logs, 3D seismic, VSP's, pressure and production data, PVT analyses and core data.

All data was loaded on a common database. Seismic time-depth conversion was done. Well data was tied to seismic and markers correlated across the field. Seismic attributes were mapped and matched with log derived properties. Seismic acoustic impedance was generated. Component thicknesses and properties were mapped across the field with seismic guidance and volumetrics calculated. This resulted in a static reservoir description appropriate to the real life situation. The static description was used in creating a simulation mesh that closely followed the heteregeneities and fault patterns in the field. A complete input data file for a black oil simulator was generated. A consistent reservoir characterization was arrived at which honoured all the input data and successfully explained some of the observed field problems.

Such an integrated reservoir model is an essential building block for an integrated Asset Management system so that the inter-relationship and inter-dependence between different elements in the E&P value chain can be clearly recognized and accounted for.

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