State-owned Oil and Natural Gas Corporation (ONGC) has made oil discovery in WO-24-3 well located west of Mumbai High fields in Arabian Sea. The well is estimated to hold in-place reserve of about 20 million tonnes. The new discovery comes almost 50 years after ONGC began production in Mumbai High, which is India’s biggest oil field. It currently produces 205,000 barrels of oil per day (just over 10 million tonnes per annum).