Yibal is the largest oilfield in Oman. An oil field is a region with an abundance of Oil wells extracting Petroleum (crude oil from below ground Oman, officially the Sultanate of Oman ( Arabic: سلطنة عُمان) is an Arab Country in Southwest Asia on the southeast It began production in 1968, and at its peak had a production of nearly 250,000 barrels per day (40,000 m³/d). In recent years, it has begun to decline, and in 2005 produces about 88,000 barrels per day (14,000 m³/d). The Yibal oil field is operated primarily by Royal Dutch Shell. Royal Dutch Shell plc, commonly known simply as Shell, is a multinational oil company of Dutch and British origins