The matured field is located in the Sarawak offshore, Malaysia. Discovered in 1968, the field is an anticlinal structure with vertically stacked reservoirs deposited in a shoreface environment. The brown field has been producing under active aquifer drive with a very high recovery factor. The field is currently producing with more than 85% WC and has significant levels of uncertainties with respect to oil-water contacts, flank structure, depth of spill points, production allocation, SCAL and residual oil saturation.Major challenges were observed in building fine static models for further dynamic simulation work. A coarse mega model were built covering all reservoirs to capture the STOIIP uncertainties in the field as well as to support an integrated conventional approach to locate the remaining oil and estimating the potential infill reserves. A robust workflow were developed to identify the infill opportunities by integrating material balance study, case hole logs information, water diagnostic plots, decline curve analysis and many more. The comprehensive LTRO methodologies applied has been successful in identifying the location of the remaining oil as well as estimating the potential reserve. This approach has also managed to accelerate field development plan and afforded the team efficient resource optimization by avoiding the more time consuming re-cycling the conventional static-dynamic modeling approach.

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