sentences:  In Assam, the Assam Oil Company was producing oil at Digboi (discovered in 1889) and Oil India Ltd. (a 50% joint venture between Government of India and Burmah Oil Company) was engaged in developing two newly discovered large fields Naharkatiya and Moraan in Assam.In West Bengal, the Indo-Stanvac Petroleum project (a joint venture between the Government of India and Standard Vacuum Oil Company of USA) was engaged in exploration work.The vast sedimentary tract in other parts of India and adjoining offshore remained largely unexplored.