P roduction optimizationstudy of “M” field Zone J71 block 3 is using blackoil simulator. The model that was created for this study was using single porosity grid model. This grid model used corner point system. Reservoir model dimension that was used has 111 x 38 x 53 block, with a total of 223.554 block, and 11.741 active block. The initialization step is the first step on reservoir simulation, we input the data required in this step, initialization step also matching the OOIP. The next step, history matching, was done by matching the performance of the model with the history data of the field, so that the model can represent the real condition of the reservoir. The next step after history matching is prediction scenario. There areseven prediction scenarios that was done for “M” field zone J71- 3. The first scenario is to open 1 old well which is B-075, the second scenario is to open 2 old wells which are B-075 and B-140, the third scenario is the second scenario + 1 additional well (E-1), the fourth scenario is the second scenario + 1 additional well (E-2), the five scenario is the second scenario + 1 additional well (E-3), the six scenario is the second scenario + 2 additional wells (E-2) and (E-3), and the seven scenario is the second scenario + 3 additional wells (E-1), (E-2), and (E-3). The cumulative production from “M” field zone J71-3 for the first scenario until seven scenario in a sequents are565.45 MSTB, 579.38 MSTB, 573.51 MSTB, 612.12 MSTB, 625.81 MSTB, 650.51 MSTB with RF22.40 %, 22.95 %, 22.72 %, 24.25 %, 24.79 %, 25.77 %, and 25.57 %. From the results, the sixscenario is considered to be the best.From these results, the selected scenario 6 as the best scenario , as in Scenario 6 provides higher recovery factor in comparison with other scenarios .