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Les sédiments syn-orogéniques du subandin et de l'avant -pays de Bolivie

Abstract : The foreland Tertiary basin located to the East of the Eastern Cordillera in the BolivianAndes has a thickness of more than 6500 meters of sediments in the proximal section, that are distributed along a 500.000 km2 surface. The presented study has been integrated from the outcrops, wells and 2D sesmic data obtained from the petroleum exploration. The fill deposits of the basin are associated to the erosion that affected the Paleozoic and Mesozoic series of the Eastern Cordillera. The structuration and deformation intensity ofthis mountaiD chain are ref1ected in the grain and strata coarsening Oligocene to recent geological sequences succession. The stratigraphic units defined in the Andean corresponds to in 5 periods: 1° Upper Oligocene-Lower Miocene Period : Petaca, Areniscas Superiores-Transici6n, Naranjillos and Bala formations; the last one is a lateral equivalent ofthe Petaca Formation in the northern part; 2° Middle Miocene-Upper Miocene Period: Yecua Formation. 3° Upper Miocene-Pliocene Period: Tariquia and Quendeque formations ; 4° Pliocene Period : Guandacay and Charqui formations ; 5° Upper Pliocene-Quaternary Period : Emborozu and Tutumo formations. The recent geometry of the foreland basin is controlled by the paleogeography of the Paleozoic series and the old structural trends reactivated during the Tertiary deformation. The Subandean and Piedmont are developped in the proximal part, and the Chaco-Beniana lands that represented the poor to non-deformed foreland developped toward East. In the central and distal part of the basin the Bomerang-Chapare zone is controlled by a subvertical transpressive system faults. The Phanerozoic sedimentary succession and the Precambrian basement are both concerned by the deformation. The effects of the erosion and the Phanerozoic progressive unconformities are weIl characterized even in the proximal part of the basin (Subandean and Piedmont front). The generation, expulsion, migration and traps of hydrocarbon that have occurred in the foreland basin are mainly related to the deformation of the last 6 My. The different grade and often different origin of the hydrocarbon distribution found in a same structure are the result of a minimun two differents stages of generation. The first one is associated to the SïlurianLower Devonian source rock and the second one to the Middle-Upper Devonian
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Submitted on : Monday, December 13, 2010 - 3:19:16 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
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  • HAL Id : tel-00546038, version 1



Jose David Zubieta-Rossetti. Les sédiments syn-orogéniques du subandin et de l'avant -pays de Bolivie. Géologie appliquée. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00546038⟩



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