Source rock identification and oil generation related to trap formation: Southeast Constantine oil field
- Sonatrach, Hussein-Dey Algiers (Algeria)
Petroleum exploration began in the Southeast Constantine basin in the late 1940s. Despite the very early discovery of Djebel Onk field (1954), exploration remains very sparse and relatively unsuccessful due mainly to the geological complexity of the region. The Ras-Toumb oil field was discovered only twenty years later. In 1988, a new discovery, the Guerguit-El-Kihal oil field renewed the interest of explorationists in this region. The Southeast Constantine Mesozoic-Cenozoic basin has a sedimentary sequence of shales and carbonates with a thickness exceeding 7,000 m. Structural traps are related to pyrenean and post-Villafranchian phases. Potential reservoirs with good petrophysical characteristics and seals can be found throughout the section and are mainly Cenomanian-Turonian and Coniacian limestones and dolomites. The known source rocks are Cenomanian-Turonian and Campanian carbonate shales. Kerogen is a mixture of type II and type III for the Campanian. The kerogen has a fair petroleum potential and is often immature or low mature. The Cenomanian-Turonian kerogen is type II amorphous, with a variable but important petroleum potential. Total organic carbon values range from 1.5% to 7%. Maturity corresponds to the oil window. This source rock is well known throughout the Mediterranean region and is related to the oceanic anoxic event. Kinetic modeling of this organic matter evolution indicates favorable oil generation timing related to trap formation ages.
- OSTI ID:
- 7033605
- Report Number(s):
- CONF-900605-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 74:5; Conference: Annual convention and exposition of the American Association of Petroleum Geologists, San Francisco, CA (USA), 3-6 Jun 1990; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
ALGERIA
OIL FIELDS
GEOLOGIC TRAPS
SOURCE ROCKS
DOLOMITE
GEOLOGIC MODELS
KEROGEN
LIMESTONE
MATURATION
SEDIMENTARY BASINS
AFRICA
ALKALINE EARTH METAL COMPOUNDS
BITUMINOUS MATERIALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MINERAL RESOURCES
MINERALS
ORGANIC MATTER
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences