We revisited the stratigraphy, structure and petroleum geology over an area of about 60,000 km2 in the Ucayali basin, Peru, integrating the work minutely done during the last years over a region that was once perceived as one of the most promising sub-Andean basins after the giant Camisea discovery. This paper presents the integration of the analysis on biostratigraphy, sedimentology, geochemistry and wells, along with a pervasive mapping over compiled, reprocessed and acquired seismic that allowed us to reconstruct the pretty complex geological history of the study area that ranges from the early Paleozoic to the late Tertiary. Three proven and one speculative petroleum systems are present in this basin: the oil prone Jurassic/Cretaceous system - restricted to the north -, the gas/light oil prone early Carboniferous -Paleozoic system, the oil prone early Permian- Paleozoic/Cretaceous system and finally the speculative Devonian-Paleozoic system. We performed 1D, seriated 2D and a 2½ dimension basin modeling to address the main processes controlling the efficiency of the Ucayali petroleum system, investigating the relations between startigraphic, tectonic overburden and the viability of long lateral versus short hydrocarbons migration mechanism. We analyzed the petroleum occurrences and the prospect failures to characterize the main play concepts of the Andean front and the basin border to determine the critical play element in the area and highlight the future exploration potential of the area.


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