Crude oil production from Mumbai High field is slated to dip to 10.362 million tonnes in 2011-12 from 12.108 million tonnes in 2007-08, a company official said.
Mumbai High, which contributed 45 per cent of the ONGC's 25.94 million tonnes crude oil production in 2007-08, is likely to produce 12.354 million tonnes this year before decline sets in.
ONGC's total crude oil output this fiscal will be higher at 27.054 million tonnes with the company bringing to production new and marginal fields. It will rise to 29 million tonnes next fiscal before dipping to 27.36 million tonnes in 2011-12.
Gas production from Bassein and its Satellite fields will dip to 5,040 million standard cubic meters (about 13.8 million standard cubic meters per day) in 2011-12 from 10,129 million standard cubic meters (27.5 mmscmd) in 2007-08, he said.
As a result of natural phenomenon, reservoir pressure at the gas field has declined with continuous production for over 20 years, they said. Bassein field was discovered in 1977, some 80-km west of Mumbai and when in 1988 it began gas production, recoverable reserves were estimated at 226 billion cubic meters (7.98 trillion cubic feet). The reserves are now estimated at about 58 billion cubic meters (2.04 tcf).
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Gas output from Basssein field, which accounts of 45 per cent of ONGC's gas production, during current year is estimated at 27.3 mmscmd which will fall to 22.75 mmscmd in 2009-10 and to 17.7 mmscmd in 2010-11.