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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 40 (1956)

Issue: 4. (April)

First Page: 547

Last Page: 561

Title: Habitat of Some Oil

Author(s): G. M. Knebel (2), Guillermo Rodriguez-Eraso (3)


Detailed statistics have been prepared and studied for 236 or all of the major oil fields of the free world. They represent 217 billion barrels, which is 82.5 per cent of the free-world's ultimate reserves discovered to date. The study shows the bulk of this oil occurs: (1) on the stable side of basins, (2) in anticlines, (3) in sandstone and carbonate reservoirs, (4) from formations of Mesozoic age or younger, and (5) from a depth range of 2,000-8,000 feet.

Most of the discovered free-world's ultimate oil is 30° API gravity or lighter, with mixed-asphaltic-base oils predominating. The discovery of the free-world's major oil fields has been cyclic, with 10-year intervals beginning in 1917.

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