The tectonic-sedimentary character and petroleum geology of block 16 in Oriente basin

Oriente basin of Ecuador is one of the most productive oilfield of the South America, Sub-Andean basins.At present Seven oilfield have been discovered in block 16.This article analyzed its tectonic and sedimentary history and it can be divided into three stages:pre-Cretaceous, Cretaceous and post-Cretaceous.Cretaceous include 5 sub-sequences and the main sedimentary facies are fluvio-deltaic (firth) and marine.Relative sea level eustasy controlled space-time change of sedimentary system and play.Neritic shale and limestone are the main source rocks of petroliferous systems and fluvio-deltaic and marine sandstones are the main productive formations.HOLLIN & M formations are main lateral migration paths, strike-slip fault and thrust fault are vertical migration paths.Hydrocarbon generation and migration peak occurred in Late Cretaceous-Oligocene.