Hermoza W. auteur aut IRD Brusset S. auteur aut IRD Baby Patrice auteur aut IRD Gil W. auteur aut IRD Roddaz M. auteur aut IRD Guerrero N. auteur aut IRD Bolanos M. auteur aut IRD text journalArticle eng The sub-Andean Huallaga basin is part of the modern retroforeland basin system of Peru. It corresponds to a thrust-and-fold belt superimposed on inverted and halokinetic structures and is characterized by Eocene-Pliocene, thick synorogenic series that have controlled the burial history of petroleum systems. Sedimentological analysis and a sequentially restored cross-section based on seismic data and new field studies show three sequences of synorogenic deposits. The Eocene (Lower Pozo member) developed in shoreface environments, when the basin morphology corresponded to a foresag depozone linked to an orogenic unloading period. The Middle Eocene sequence (Upper Pozo member) developed in shallow marine environments and recorded a change in Andean geodynamics and the retroforeland basin system. The basin morphology corresponded to a foredeep depozone linked to an orogenic loading period. This configuration remained until the Middle Miocene (Chambira Formation). The Middle Miocene-Pliocene sequence recorded the onset of the modern sub-Andean Huallaga basin that became it wedge-top depozone. Thrust propagation occurred in a deltaic environment, which evolved progressively to an alluvial system linked to the modern Amazon River. (c) 2005 Published by Elsevier Ltd. specialized deltaic and estuarine deposits eocene foreland basing Huallaga basin miocenc Peru petroleum systems sub Andean 064 19 1 21-34 2005 0895-9811 https://www.documentation.ird.fr/hor/PAR00000447 10.1016/j.jsames.2004.06.005 0895-9811 https://www.documentation.ird.fr/hor/PAR00000447 IRD - Base Horizon / Pleins textes 2006-03-29 2017-08-23 PAR00000447 fre