This paper presents a field case study describing how 3-D geological data are used in reservoir simulation to improve performance forecast and help optimize the development of the Serang Field, East Kalimantan, Indonesia.

The Serang field consists of complex stacked fluvial and deltaic channel sands under a large gas cap and over a strong aquifer. Development of the field is a challenge with the reservoir heterogeneity nature of the sands and the dynamic movement of fluid flow. Reservoir management is even more difficult as the originally thick oil columns have now become thinner with long-term production as adding infill wells or planning workovers require more accuracy for target locations. The study demonstrates the workflow involved in integrating the 3D geological data for constructing a reservoir model for field management. The model constructed helps explain the reservoir fluid flow behavior, identify by-passed oil under reservoir heterogeneity, plan for infill locations and workovers and long-term development strategy of the field. It shows the key benefits include a faster work process of building a reliable model that accounts for crucial heterogeneity, flexibility in varying reservoir properties with new data, and quicker history matching of the production data. These allow for quick turn-around to evaluate multiple development plans while improving production forecast.

The paper also discusses the practical and operational use of the model results in planning, implementing and operating wells for optimizing oil and gas recoveries.

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