August 11, 2012. ONGC said it has made a huge oil discovery off the West coast that will help the state-owned firm raise its sagging oil output. The new discovery was made in the currently producing D1 oilfield. D1, which is currently producing 12,500 barrels per day (bpd), had an approved peak output of 36,000 bpd. With the new discovery, the peak output would jump to 60,000 bpd or three million tonnes a year. D1, primarily an oil producing field, is situated about 200 km west of Mumbai city in Deep Continental Shelf at a water depth of 85 to 90 metres. The field comprises of four blocks namely D1-4, D1-12, D1-14 and D1-2/5. The first well in D1-4 block was drilled in the year 1976. The low gas-to-oil-ratio (GOR) and the then understanding of reservoir led to slow pace of exploration and appraisal of the field. In the next phase of development, ONGC is implementing an integrated development plan for the entire D1 field. This would raise the output to 36,000 bpd by February, 2013. The new pool now discovered will take the output to 60,000 bpd by 2016-17.