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Abstract

The North Subandean is an extended fold and thrust belt located at the north-western sector in Bolivia. It is considered an area of exploratory interest; the present level of knowledge is useful to identify the functioning of the Petroleum System associated to Devonian source rocks. Tequeje and Tomachi formations are the main source of hydrocarbons. The organic matter contained in such rocks is mixed kerogen types II and Ill. The genetic relationship between oil seeps and shale extracts has a remarkable correspondence. Permo-Carboniferous Retama and Copacabana formations present high quality rocks but there is no sufficient evidence to verify their relationship with the analyzed petroleum. The North Subandean Tectonic styles are mainly controlled by stratigraphy of Paleozoic sequences. Beni and Tuichi synclinoriums and Toregua-Palacios belt represent well defined tectonostratigraphic units. Traps are in general fault propagation fold, fault bend fold, subtrhust and backthrust structures. The constitution of ramps and imbricate structures of the last subandean structural trends are associated to faults that move Beu Formation sandstones to the surface in the absence of Devonian shales. The interpretation of vitrinite reflectance and data on apatite fission track<br>suggests that the thermal history is not uniform in the basin. Hydrocarbon expulsion and generation as well as the formation of traps are active during the different tectonic pulses produced in the last 16 Ma. Erosion and sedimentation processes related to deformation of orogenic fronts are associated with thermal maturity level of Paleozoic source rocks. Additionally, the location of intrusive bodies in Devonian and Mesozoic series located in the north-west sector of the area under study increases the heat flow in the basin.

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/content/papers/10.3997/2214-4609-pdb.266.9
2008-11-05
2024-03-28
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