Irans largest non-associated Natural Gas field is South Pars, geologically an extension of Qatars North Field. Current estimates are that South Pars contains 280 Tcf or more (some estimates go as high as 500 Tcf) of natural gas, of which a large fraction will be recoverable, and over 17 billion barrels of liquids. Development of South Pars is Irans largest energy project, already having attracted around $15 billion in investment. Natural gas from South Pars largely is slated to be shipped north via the planned 56-inch, 300-mile, $500 million, IGAT-3 Pipeline, as Well as planned IGAT-4 and IGAT-5 lines. Gas also will be reinjected to boost Oil output at the mature Agha Jari oil field, and possibly the Ahwaz and Mansouri fields. Besides condensate production and reinjection/enhanced oil recovery, South Pars natural gas also is intended for export, by pipeline and also possibly by liquefied natural gas (LNG) tanker. Sales from South Pars could earn Iran as much as $11 billion per year over 30 years, according to Irans Oil Ministry.