The Northern Marañón Basin is part of the prolific Oriente-Marañón hydrocarbon basin in the Andean eastern foreland. More than four billion barrels of oil have been discovered to date and reserve estimates indicate 4–7 billion barrels of oil in additional undiscovered potential (Figure 1).

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Marañón Basin, in the northwestern corner of Perú is, in general terms, a relatively simple west-dipping sedimentary wedge with sediments ranging in age from Jurassic or older (in the deeper western foredeep) to Tertiary onlapping (on the Brazilian craton to the east). Several phases of hydrocarbon migration, from a western foredeep, have taken place...

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