The report, tabled in the Assembly today, also said that even the domestic exploration by the Gujarat State Petroleum Corporation generated meagre revenue.
CAG presented a gloomy picture of GSPC's finances, as its borrowings stand at 19,716 crore as of March 2015, a jump of 177 per cent since 2011.
"The company went ahead acquiring overseas blocks during 2006-2010 mainly as an operator with considerably high participating interests and without any prior experience overseas. The delayed execution of work resulted in cost escalations in such blocks," it said.
Among the major surrendered blocks were North Hap'y and South Diyur blocks in Egypt.
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"The delays in execution of minimum work program led to huge cost over-runs in North Hap'y block, as the company incurred USD 263.98 million which was 76 per cent higher than the committed expenditure of USD 150 million."
GSPC had 64 blocks as of April 2011. But 37 blocks, including ten overseas, were surrendered between 2011 and 2015 and exploration expenditure of Rs 2,514.65 crore was written off, CAG noted.
GSPC had to rely heavily on borrowings mainly for the activities in the KG block. The total interest burden increased from Rs 981.71 crore in 2011-12 to Rs 1,804 crore in 2014-15, the report said.
In future, GSPC should assess the risk while venturing into exploration, and "means of risk mitigation, such as induction of strategic/financial partners may be timely considered", CAG said.