Iraq 's draft deal with Royal Dutch Shell PLC (RDSA) to capture and exploit the huge volumes of gas flared from its giant southern oil fields is expected to produce 2.5 billion cubic feet a day, an Iraqi government spokesman said Wednesday.

"This is the amount of gas that is expected to be produced from four oil fields covered by the project in the southern region," Ali al-Dabbagh said in a statement.

Iraq 's cabinet on Tuesday ratified the deal, paving the way for a final signature of the project seen crucial to Iraq 's oil expansion polices and to provide fuel for its much-needed electricity.

The investment required for the 25-year venture--in which
Baghdad has 51%, Shell 44% and Mitsubishi Corp. (8058.TO) 5%--is $12.5 billion, Dabbagh said.