Shares of India's largest oil explorer Oil and Natural Gas Corp up as much as 3 pct, their highest since June 15.
Co's discovery in the west of its Mumbai High offshore fields is estimated to hold in-place reserves of about 20 mln tonnes, sources told Reuters.
ONGC tested nine zones of which one yielded more than 3,000 barrels per day.
Shares, which were in the negative territory early in the day, rose as much as 3.7 pct after the Reuters report.
Stock is among top gainers on the broader NSE index.
