As you see here, gas field such as ZOHR (OGIP = 30 TCF) based on Arab Gulf plan, it must put on gas plateau rate 3.0 BSCFD to be sustained 17 years. In Egypt, within 3 years only, the field gas rate declined 1.0 BSCFD, which caused serious problems for Egypt (stop gas exporting, no covering for the consumption and cut the electricity, entering Israel gas into the market to cover the consumption instead of exporting).
I'm not sure OGIP was ever 30tcf
International Operations and Performance
9moThey built it fast though.