Irong Barat Field, located in the southeastern part of the Malay Basin, was discovered in 1979. The field structure is a complexly faulted WNW-ESE trending asymmetrical anticline dissected into four major fault blocks by a set of NNW- SSE trending normal faults, with additional subsidiary faults further segmenting the field in the central fault blocks. Oil bearing reservoirs are encountered in the H and I reservoir groups, with the bulk of reserves and present production from the H-50 unit. Existing development, 18 wells from a manned Irong Barat A platform, is mainly confined to the structurally less complex Fault Block I with 2 wells completed in the adjacent Fault Block II. Production started in November 1983 and more than 80% of the estimated developed reserves have been produced. Currently the field is producing at 11 MSTB/D.

A multi-disciplinary team was formed to identify and mature the hydrocarbon potential of the complexly faulted undeveloped Fault Block II, III and IV and also the remaining opportunity in Fault Block I. The 3D seismic, appraisal well, production and well data were reviewed and a few development options were considered. As a result of the integrated field review, 2 additional drilling programs are planned to further develop the field, which involve drilling of 20 new wells from existing Irong Barat A and a new Irong Barat B platform.

This paper discusses how the integrated field review enabled the team to further develop the field through better understanding of the reservoir and geology and better managing of the uncertainties.

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