The inter-reservoir communication plays a major role in the dynamic performance of any reservoir. Hence, characterizing and understanding the degree of the communication is essential in modeling the reservoir behavior. This paper demonstrates the power of the pressure transient tests in successfully detecting and characterizing the communication between two reservoirs separated by a very thin tight layer as a case study. It also presents the results of integrated pressure transient analyses for long build-up tests conducted in one of the wells, the data of which was acquired from the PDHMS. These confirm the inter-reservoir communication in this field. Using a numerical interpretation technique, a rigorous multi-layer model has successfully matched the pressure transient data and has helped estimating the degree of the communication between the two reservoirs. It has also allowed characterizing the thin tight layer that separates the two reservoirs and controls the inter-reservoir hydraulic communication. This work will help the simulation models of the field to quantify the degree of the communication and capture the real performance of the reservoirs in order to achieve better and effective reservoir management and development plans.

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