The Material Balance method is a good analytical tool for assessing and understanding energy balance and connectivity of reservoirs. This method was used to investigate the effect of water injection in a target reservoir and pressure response in the target reservoir and an adjacent reservoir in Okan field.Water injection was initiated in two adjacent reservoirs (Reservoir "A" and Reservoir "B") in Okan Field in year 2002 with wells A1_Inj and B1_Inj respectively. Another water injector (Well A2_Inj) was completed in Reservoir "A" in year 2008 to provide further pressure support for the reservoir. Analysis showed that the water injection in Well A2_Inj was not providing pressure support to Reservoir "A" as expected. In addition an unexpected reservoir pressure increase was observed in Reservoir "B" from year 2008. It was suspected that Well A2_Inj was injecting out of zone and there was contemplation to cut-back water injection in the well and allocate the water injection to other injectors in the field.
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