F inal project titled "Surveillance, Monitoring, and Production Analysis toEstimate Waterflood Performance of Zone 600 Block Y at Field X" discusses thesuccess of waterflood. The analysis is expected to provide idea for the upcomingwaterflood project.Analysis using DSS software shows that the production performance ofZone "Y" Block 600 has an incremental production of 531.941 BBL. The DSSanalysis on the response and connectivity among the injection and the productionwell shows that ten pair of injection wells and production wells are connectedproperly. The DSS analysis of Voidage Replacement Ratio (VRR) is 0.65, whichmeans the waterflood of Zone 600 Block "Y" is not optimal yet. The DSS analysisof the bubble map shows that the drainage radius of more than 150 meters are foundin two production wells, namely R029 and R032HZ. The DSS analysis of the scatterplot shows that the water cuts of four production wells are above 70% and the restof the wells are still below 70%. The analysis of DSS on Hall plot shows that oneinjection well experiences plugging, two wells are indicated the presence offracture, and the other two wells are considered normal or stable water injection.Diagnostic plot shows that six of nine production wells have channeling waterinjection.The analysis of modification Buckley-Leverett of Welge shows that thewater breakthrough time of 601 days or 1.6 years and the cumulative oil productionof 1,746,524 STB which means waterflood recovery factor is 43%.