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RM field is one of the fields located in Java Island. RM Field has great potential to be developed, In the RM field water injection has been done to increase the value of oil production. To find out the effect of heterogeneity on the RM field, dykstra parson was analyzed. The layers analyzed in the RM field were layers 22, 23 and 24. The results of the analysis for the Vdp value at layer 22 is 0.828, the Vdp value at layer 23 is 0.814, and the Vdp value in layer 24 is 0.812. With the dykstra parson analysis, it can be seen that RM field reservoirs tend to be heterogeneous, this is seen from the Vdp value which approaches the number 1, which is equal to 0.812 to 0.828 In addition, a mobility ratio analysis was carried out using rocktype 1 on the RM field and the M value on rocktype 1 was 0.3429. with a value of M <1 which means it can produce high sweeping efficiency and produce good oil recovery.