The development assumes significance given that Indian government recently issued notices to Tiktok and Helo.
UltraTech had 19,557 permanent employees on its rolls as on March 31, 2019.
The fields produced an average of 1.76 million standard cubic metres per day of gas during April-June, the firm said.
Grant Thornton was asked to review ratings provided by various credit rating agencies (CRAs) to IL&FS group companies.
The official said the government plans to source up to Rs 1 lakh crore of loans from foreign institutions.
Mukesh Ambani’s remuneration for 2018-19 included Rs 4.45 cr as salary and allowances, which is marginally lower than Rs 4.49 cr.
This is the second investment this year that Brookfield is making in a venture controlled by richest Indian Mukesh Ambani.
The company has reported the highest ever quarterly profit after tax in the latest June quarter.
The country's reserve position with the fund also declined by USD 1.5 million to USD 3.345 billion.
Net profit in April-June stood at Rs 10,104 crore while consolidated revenue rose to a record Rs 1,72,956 crore.