Roc Oil downgrades reserves at Basker-Manta-Gummy

Roc Oil has downgraded the proven and probable reserve estimates for it’s Basker-Manta-Gummy oil and natural gas fields. The preliminary results from the first integrated full-field reservoir simulation model for the Basker and Manta reservoirs point to remaining gross 2P reserves for the project of 3 to 5 million barrels, a reduction of 18 million barrels. 

The Basker-Manta-Gummy oil field continues to produce at a rate of 6,000 barrels of oil a day, and the expected average output for the oil field in 2010 is 5,000 barrels of oil per day. 

Nonetheless, the future development plans for the Basker-Manta-Gummy project, including an oil development and natural gas development phase, are now being reevaluated. 


Basker-Manta-Gummy is located in the Gippsland Basin of the Bass Strait offshore Australia. The Basker field was discovered in 1983, the Manta field in 1984 and the Gummy field in 1990. The project was brought on-stream via five development wells tied to the FPSO Crystal Ocean at the end of 2006. Natural gas is currently flared and reinjected. Peak production for the three-field project was 15,000 barrels of oil per day. 

Roc Oil serves as the operator of Basker-Manta-Gummy with 30 percent interest in the field. Partners on the project include Beach Energy with 30 percent, CIECO Exploration and Production with 20 percent, Sojitz Energy with 10 percent and Pertamina with 10 percent.

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