Giant fields then and now

12/17/2001
What is a giant oil or gas field? What is its importance?We do not find total agreement on size definitions. Even the American Association of Petroleum Geologists and Oil & Gas Journal have not always used the same definition. This column summarizes giant field status and lore.AAPG and giant fieldsAAPG Memoir 40, published in 1986 and edited by long-time geologist Michel T. Halbouty, defined a giant field as "having 500 million bbl of recoverable oil or equivalent gas," with gas converted at a ratio of 6,000 cu ft/bbl.Halbouty's studies of giant fields date to Memoir 14 in 1968.AAPG still uses the above cutoffs, expressed as 500 million bbl of oil and 3 tcf of gas.Memoir 40 listed 509...
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