Net profit in January-March at Rs 4,340 crore was 6.2 per cent lower than Rs 4,625 crore net profit in the same period a year ago.
The drop was despite the company's net price realisation for crude oil produced from nominated fields rising 57 per cent to USD 54.91 a barrel and also from joint venture fields by 68 per cent to USD 48.72 a barrel.
The royalty payment was due after the government agreed with the contention of Gujarat and Assam that the state-owned company should pay royalty on gross price for crude and not the net price it realised after paying for fuel subsidises.
Also, the company provisioned Rs 1,944 crore towards ensuing pay revision for employees.
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"But for the royalty payments, our net profit would have been higher by Rs 1,600 crore," he said.
Also, the company lost Rs 4,000 crore in revenue on natural gas price dipping to USD 2.5 per million British thermal unit from USD 3.82 per mmBtu in Q4 of 2015-16 fiscal.
For the full fiscal, the company reported a 10.9 per cent rise in net profit to Rs 17,900 crore on flat revenue of Rs 77,907 crore.
Net realisation on crude oil produced from nominated fields was up 6.6 per cent at USD 50.27 per barrel and that from joint venture fields by 4 per cent at USD 44.09 a barrel.
Out of 13 onland discoveries, nine were monetized during the year itself having a potential of 0.218 million tonnes of oil equivalent per year.
ONGC's crude oil production rose marginally by 0.8 per cent in January-March to 6.39 million tonnes but fell 1.5 per cent in the full year to 25.534 million tonnes.
Gas output was up 13.4 per cent in Q4 to 5.944 billion cubic meters and by 3.3 in full 2016-17 fiscal to 23.27 bcm.
Consolidated turnover was up 4.8 per cent at Rs 1,42,149 crore.