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World's giant oil and gas fields, geologic factors affecting their formation, and basin classification. Pt. 1. giant oil and gas fields

Journal Article · · Mem. - Am. Assoc. Pet. Geol.; (United States)
OSTI ID:5964778
In this paper, a giant oil field is defined as one containing 500 million bbl or more of recoverable oil; a giant gas field has a minimum of 3.5 trillion cu ft of recoverable gas. At least 187 giant oil fields and 79 giant gas fields are known. Together they contain an estimated, ultimate, minimum recoverable reserve of 638.77 billion bbl of oil and 1,180 trillion cu ft of gas. Reserves of oil remaining to be produced from these giant fields amount to 521 billion bbl. Of all giant oil-field reserves, 58% is in sandstone and 42% is in carbonate reservoirs; 75% of giant-gas-field reserves is in sandstone and only 25% in carbonate reservoirs. A total of 29% of the oil and 10% of the gas is in strata of Tertiary age; 63% of the oil and 65% of the gas is in beds of Mesozoic age; and 8% of the oil and 25% of the gas is in Paleozoic reservoirs. The largest number--190 (71%)--of the giant fields is in the Eastern Hemisphere; only 76 (29%) are in the Western Hemisphere; of those in the Eastern Hemisphere, 154 (58% of the world's total) are in a U-shaped belt 6,000 miles (10,000 km) long and 750 to 1,300 miles (1,250 to 2,000 km) wide that extends from Algeria to the Arctic Ocean at the longitude of the Polar Urals.
OSTI ID:
5964778
Journal Information:
Mem. - Am. Assoc. Pet. Geol.; (United States), Journal Name: Mem. - Am. Assoc. Pet. Geol.; (United States) Vol. 14; ISSN MAPGA
Country of Publication:
United States
Language:
English