Phaneorozoic sequence stratigraphy of Bolivia and adjacent regions

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

OSTI ID:6107699

Sempere, T ^[1]

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1. Convenio YPFB-Orstom, Santa Cruz (Bolivia)

Phaneorozoic sequence stratigraphy of the Pacific margin of western South America, particularly the Bolivian section, has been completed and new interpretations and hypotheses have been proposed as a result of data analyses of this information. The Paleozoic margin was initially passive (late Cambrian-Llanvirn, [open quotes]Puna aulacogen[close quotes]), but became active during a middle Ordovician compressional episode. Most of late Cambrian to early Triassic Bolivian rocks are of marine origin, with dark shale units recording sea level rises, whereas middle Triassic to Recent rocks were mainly deposited in continental environments (except six restricted-marine ingressions in the late Cretaceous-Danian, and one in the late Miocene, all with hydrocarbon potential). A noteworthy similarity exists between the Devonian to Jurassic stratigraphies of Bolivia and the Parana basin, suggesting that Bolivia behaved as part of the Brazilian craton from late Cambrian to late Jurassic, when it was captured into the Pacific margin geotectonic system. Organic-rich units correlate with Paleozoic highstand deposits and younger ingressions. The Bolivian Phanerozoic strata is characterized by thick layers, partly due to middle Ordovician-Carboniferous and late Cretaceous-Cenozoic foreland basins. Paleozoic foreland geometries include northeastern onlaps and, potentially, stratigraphic traps. Hydrocarbon generation, migration and trapping mainly depended on Cenozoic structural loading and burial and on propagation of Andean deformation which are comprised of Paleozoic shale decollements. Precise knowledge of the evolution of the Phanerozoic geodynamic contexts and basin geometries through sedimentation and subsequent deformations is crucial for hydrocarbon exploration strategies in these regions.

• OSTI ID: 6107699
• Report Number(s): CONF-930306-; CODEN: AABUD2
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:2; Conference: International congress of the American Association of Petroleum Geologists (AAPG), Caracas (Venezuela), 14-17 Mar 1993; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
BOLIVIA
CONTINENTAL MARGIN
GEOLOGIC STRATA
ORIGIN
GEOLOGIC STRUCTURES
DEFORMATION
CAMBRIAN PERIOD
DEPOSITS
EXPLORATION
GEOLOGIC TRAPS
HYDROCARBONS
MIGRATION
PLATE TECTONICS
SEDIMENTATION
STRATIGRAPHY
TRIASSIC PERIOD
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGY
LATIN AMERICA
MESOZOIC ERA
ORGANIC COMPOUNDS
PALEOZOIC ERA
SOUTH AMERICA
TECTONICS
020200* - Petroleum- Reserves
Geology
& Exploration