Volga-Ural basin, U. S. S. R. : Rich petroleum systems with a single source rock

Conference · Fri Mar 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7079494

Ulmishek, G F ^[1]

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1. U.S. Geological Survey, Denver, CO (United States)

The Volga-Ural basin has produced about 40 billion barrels of oil and still produces a billion barrels annually. The productive Middle Devonian-Lower Permian sequence is composed of various carbonate rocks (including reefs) with clastic intervals in the Middle Devonian-lower Frasnian, middle-upper Visean, and Middle Carboniferous. A single source-rock unit, the Frasnian Domanik Formation, 30-60 m thick, is responsible for productivity of the entire sedimentary section. The three clastic intervals and underlying carbonate strata contain the bulk of the hydrocarbon reserves. Widespread upward and downward vertical migration in this structurally simple basin is explained by imperfect regional seals. Imperfection of the seals has also resulted in a predominance of oil over gas. The best seal is the overpressured Domanik Formation itself; it separates the sedimentary section into two petroleum systems: one in underlying Middle Devonian-lower Frasnian clastics and the other in overlying clastic and carbonate rocks.

• OSTI ID: 7079494
• Report Number(s): CONF-910403--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ASIA
CARBONATE ROCKS
DEVELOPED COUNTRIES
DEVONIAN PERIOD
EUROPE
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGY
MINERAL RESOURCES
PALEOZOIC ERA
PERMIAN PERIOD
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
REEFS
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SOURCE ROCKS
USSR