请将下面这段话翻译成英文:
春晓油气田
春晓油气田是中国在东海陆架盆地西湖凹陷中开发的一个大型海上油气田,由4个油气田组成,占地面积达2.2万平方公里。"春晓"油气田是一个四方合作项目,包括中海油,中石化,优尼科和英荷壳牌,中海油和中石化合起来绝对控股。2005年9月19日,春晓油气田进入正式生产阶段。
参考译文
Chunxiao Oil and Gas Field
Chunxiao Oil and Gas Field is a large offshore oil and gas field exploited by China in the Xihu depression of the East China Sea shelf basin, and consists of 4 subordinate oil and gas fields and covering an area of 22,000 square kilometers. It is co-developed by four parties, namely CNOOC (China National Offshore Oil Company), Sinopec, Unocal Corp and Royal-Dutch Shell, and the former two jointly hold all the stocks. Chunxiao Oil and Gas Field has been operating since September 19, 2005.