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March 7-10, 2010 – Manama, Bahrain
Characterization of Ahmadi Reservoir of Bahrain Field with DFN Model Using 
Transient
Well Testing
(1) Petroleum Engineering, Bahrain Petroleum Company (Bapco), Awali, Bahrain.
(2) Beicip-Franlab, Rueil-Malmaison, France.
The Ab formation of the Ahmadi group in is one of the most difficult reservoirs to produce in Bahrain Field. It has tight matrix with low permeability and complex fracture system makes it difficult to produce. Hence, the understanding of such fractured systems is essential for modeling and improving the production and ultimate recovery from this reservoir. To help with that, Discrete Fractured Network (DFN) modeling has been used to characterize this fractured reservoir. If integrated with other data from the field, DFN can provide more representative fractured models. Transient Pressure Welltesting, a widely known applied reservoir characterization technique, can be used to validate the suggested DFN models.
This paper presents the work that incorporates a sensitivity analysis study used to test and investigate the parameters that have a direct effect on the curve signature of the transient pressure welltest analysis and their interpretations.
Different customized DFN models were built and simulated to obtain the pressure measurements under different scenarios. Various pressure
derivative curves were generated and compared to investigate the sensitivity of fracture parameters on the signature responses.
The study concludes with actual field cases from the Ab fractured reservoir.