By Saurabh Chaturvedi

NEW DELHI--India has asked Reliance Industries Ltd. (500325.BY) to give up about 80% of the area of its natural gas block off India's east coast, citing delays in the development of the hydrocarbon reserves, Oil Secretary Vivek Rae said Wednesday.

"After considering the matter, we issued the order today saying that the discoveries deemed to have been relinquished," Mr. Rae told reporters. "The notices will be sent to Reliance today [Wednesday]."

The oil ministry wants Reliance and its partners--the U.K.'s BP PLC and Canada's Niko Resources--to give up five discoveries in the block totaling 6,198.88 square kilometres out of a total 7,645 sq km area in KG-D6 east coast block.

Mr. Rae didn't say how much gas reserves the discoveries held. A Reliance Industries spokesman didn't immediately respond to a query seeking comments.

Natural gas output from the Krishna Godavari basin's D6 block, in which BP has a 30% equity stake, has declined to about 14 million cubic metres a day from 60 mmscmd at the end of 2010. The companies have cited geological complexities for the steady fall in output.

Write to Saurabh Chaturvedi at saurabh.chaturvedi@wsj.com

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