Cairn India Tuesday said oil reserves in its Thar desert field in Western State Rajasthan have increased to four billion barrels of oil equivalent.
Previously, discovered in place resources were pegged at 3.
7 billion barrels of oil and oil equivalent gas, the company said in a press statement here.
"Resource base provides potential to produce 240,000 barrel of oil per day (as against previous estimate of 175,000 bpd)," it said.
Cairn said it is on track to ramp up output from Rajasthan fields to 125,000 barrels per day in the second half of 2010.
Current output is around 20,000 bpd.
The company has tied up sale of 143,000 bpd (over 7 million tonnes a year) of oil.
Cairn said production potential from Mangala, the largest field in the block, has increased to 150,000 bpd from previous 125,000 bpd.