Essar Oil, which has so far invested Rs 3,300 crore in the CBM block, is targeting to reach peak output of 3 mmscmd in 2017-18 fiscal year.
"Raniganj (East) Block in West Bengal has become India's first CBM (Coal Bed Methane) asset to cross the 1 mmscmd production milestone. This makes Essar the country's largest unconventional gas player," the company said in a statement.
Essar had started test production from the block in 2011.
"We are targeting 1.8-1.9 mmscmd of production by the end of current fiscal and by mid of 2017-18 fiscal we should be producing peak output of 3 mmscmd," the company's CEO-E&P Manish Maheshwari said.
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In the last 12 months, the average well productivity has more than doubled, he said adding the company has planned a capex of Rs 500 crore for CBM exploration and production this fiscal.
The price of gas is as per government notified rate is USD 3.06 per million British thermal unit at present.
"There are tremendous opportunities in the domestic unconventional hydrocarbon sector. The Hydrocarbon Exploration Licensing Policy (HELP), which was announced by the Government in March 2016, recognises this potential in contributing towards national energy security," Maheshwari added.
An independent study puts in-place shale gas resources of around 8 Tcf underneath the CBM play in the Raniganj (East) Block, the statement said.
Essar has approached the government for permission to further explore shale formations the CBM block.