Lower Cretaceous Cogolla Group, Maracaibo Basin, Venezuela: sedimentology, diagenesis, and petrophysics
Journal Article
·
· Am. Assoc. Pet. Geol. Bull.; (United States)
OSTI ID:6150234
- Maraven S.A., Caracas, Venezuela
The Cogollo Group, consisting mainly of carbonates, was deposited over a broad and irregular stable shelf. High-energy, shallow, normal-marine environments are represented by grainstone/packstone bars, interbar deposits, and pelecypod biostromes. Low-energy, restricted, shallow-marine environments are shown by back-bar to tidal-flat deposits including lagoonal sediments rich in organic matter, shales, and glauconitic and quartzitic sandstones. Diagenetic processes were ongoing during hydrocarbon migration. Thus the modest texture-related reservoir space in the carbonates was, and still is, able to store the oil. Local fractures and leached intervals in the carbonates allow oil to drain and be produced. Thus, fractures form a significant element in Cogollo production capacity. (JMT)
- OSTI ID:
- 6150234
- Journal Information:
- Am. Assoc. Pet. Geol. Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol. Bull.; (United States) Vol. 65:6; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Conference
·
Sun Jan 31 23:00:00 EST 1993
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5939657
Eocene and Upper Cretaceous carbonate reservoirs in east-central Tunisia
Conference
·
Thu Jan 31 23:00:00 EST 1985
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:5945606
Carbonate depositional styles controlled by siliciclastic influx and relative sea-level change - Lower Cretaceous, Central Lake Maracaibo, Venezuela
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·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5694981
Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CRETACEOUS PERIOD
DEPOSITION
DEVELOPING COUNTRIES
DIAGENESIS
FAILURES
FRACTURES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FISSURES
GEOLOGIC STRUCTURES
GEOLOGY
LATIN AMERICA
MESOZOIC ERA
MINERAL RESOURCES
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
SOUTH AMERICA
VENEZUELA
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CRETACEOUS PERIOD
DEPOSITION
DEVELOPING COUNTRIES
DIAGENESIS
FAILURES
FRACTURES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FISSURES
GEOLOGIC STRUCTURES
GEOLOGY
LATIN AMERICA
MESOZOIC ERA
MINERAL RESOURCES
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
SOUTH AMERICA
VENEZUELA