Gas and condensate accumulations of the Gran Camisea Area have their origin in Paleozoic source rocks of the Ambo Group with probable additiona contrbution of the Cabanillas Group. The Ene and Shinai units are speculatively considered minor source rocks. The present day maturation status in the anticline positions spans different stages of hydrocarbon generation from mid-maturity to slight overmaturity. Hydrocarbon generation and expulsion occurred during the Andean Orogeny synchronically with the traps formation, typically four way closure anticlines covering tens of square kilometers. The large thrusting which produced these structures also provided the hydrocarbon migration conduits. The distribution of gas condensate in the different reservoirs is controlled by smaller accommodation faults. Reservoirs are constituted by Upper Paleozoic and Cretaceous siliciclastic rocks. Due to their considerable thicknesses and good petrophysical properties these rocks allow the accumulation and production of huge quantities of hydrocarbons. The large volume of mature source rocks and the efficient migration system coupled with the excellent reservoir quality make the “Gran Camisea” region being one of the most prolific hydrocarbon provinces of South America.


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