The Dulang Unit Area covers the central part of the highly heterogeneous Dulang Field which is located offshore Peninsular Malaysia. The Unit Area consists of 19 stacked shaly sandstone reservoirs which are divided into about 90 fault blocks containing multiple fluid contacts. The estimated Original-Oil-In-Place (OOIP) is in the vicinity of 700 million stock tank barrels (MMSTB). Production commenced in March 1991 and is currently maintained at more than 50,000 barrels of oil per day (BOPD). Reservoir simulation is one of the vital tools which has been employed from the very beginning to develop as well as manage this challenging field. This paper documents a case history dealing with the construction of numerical models of two distinct fruit blocks in one of the major reservoirs (E14). The simulation studies led to the consolidation of the development plan as well as reservoir management strategies. They also greatly aided in improving the reservoir characterization.