S umm a ryThis paper describes a field study of a faulted, fractured, and multi-layered carbonate reservoir witti 17 years of production and pressure bistory from 59 Wells . The reservoir is supported by an extensive aquifer that bas been sweeping the hydrocarbon from bath the bottom and the edge . Early water breakthrough and rapidly increasing water cut bas been a major problem in many of the weila . The major objective of [bis study is to understand Huid movement in this complex multi-layered reservoir system, to locate the hydrocarbon that is trapped or unswept, and to recover' it in an optimum fashion . The field is currently producing at an average water cut of 84%. Three infill Wells have been drilled on locations recammended by the simulation, and veere found to be at their initial water saturation as predicted by the model .