Evolution of the Llanos Basin and the deformation of the Eastern Cordiller, Columbia

Conference · Mon Feb 01 04:00:00 EST 1993 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:6103437

Addison, F; Cooper, M; Hayward, A

The Llanos Basin is located on the flank of the Eastern Cordillera in northeast Colombia. Basin development commenced with the deposition of a synrift Triassic and Jurassic megasequence related to the separation of North and South America in the Caribbean. Basin development continued with the Cretaceous Back Arc Megasequence deposited in a back arc basin behind the Andean subduction zone. Three major sequences can be recognized corresponding to extensional pulses in the Tithonian, Albian, and the Santonian which control thickness and facies distributions. The primary reservoir in the basin is the Late Eocene Mirandor Formation which was deposited in a fluvial system which prograded from the Guyana Shield to the west-northwest. This was deposited as part of the Pre-Andean Foreland Basin Megasequence (Bartonian to Serravallian) which developed as a result of uplift onset and deformation in the Central Cordillera. This megasequence covered the Magdalena Valley the Eastern Cordillera ad the Llanos Basin. In the foothills of the Eastern Cordillera, the Mirador Formation begins to show evidence of marine influence and was probably deposited in a series of shoreface sands and offshore bar complexes in the Cordillera. The Pre-Andean Foreland Basin Megasequence includes the Eocene-Oligocene Carbonera Formation which was deposited in a low every fluvial system that was mud dominated. Within the Carbonera Formation, a series of major, grossly coarsening upward cycles can be seen which are separated by maximum flooding surfaces that approximate to time lines. These cycles correspond to the early phases of development of the Central Cordillera with each pulse being seen as an influx of coarser clastics to the basin. The deformation style in the Eastern Cordillera is a mixture of thin-skinned thrust structures and the inversion of the thick-skinned basement involved extension faults. The inversion structures include the Cuisana field, a giant oil and gas-condensate discovery.

• OSTI ID: 6103437
• Report Number(s): CONF-930306--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 77:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
CENOZOIC ERA
COLOMBIA
CRETACEOUS PERIOD
DEFORMATION
DEPOSITION
DEVELOPING COUNTRIES
ENERGY SOURCES
EOCENE EPOCH
FOSSIL FUELS
FUELS
GAS CONDENSATE FIELDS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRATA
GEOLOGIC STRUCTURES
HYDROCARBONS
JURASSIC PERIOD
LATIN AMERICA
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
ORGANIC COMPOUNDS
ORIGIN
PETROLEUM
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCE ASSESSMENT
RESOURCES
SOUTH AMERICA
TERTIARY PERIOD
TRIASSIC PERIOD