Tectonic Evolution in Oriente Basin of Ecuador

Abstract

Abstract: Oriente basin is one of the important petroliferous basins of Latin American region with higher levels of exploration and development. For the purpose of in-depth understanding of the tectonic evolution and the oil accumulation controlment in Oriente basin, the study of the sedimentary strata distribution and tectonic subsidence has been carried out through the overall consideration of MOP (Mranon-Oriente-Putumayo) petroleum province consisting of Ecuador's Oriente basin, Colombia's Putumaro basin and Peru's Maranon basin. Based on subsidence mechanism and sedimentary strata, Oriente basin is roughly divided into three stages in tectonic evolution, i.e. Paleozoic passive continental margin, Mesozoic back-arc rift and Cenozoic back-arc foreland. According to the characteristics of faults, considering subsidence-sedimentation characteristics of the entire MOP petroleum province, Oriente basin could be spatially divided into three tectonic units, i.e. the western sub-Andean belt, the central belt and the eastern foreland slope belt. Tectonic evolution has an absolutely dominant role in controlling hydrocarbon accumulation. Lots of low-amplitude anticline traps were formed mostly during the west (early) Andes episode in the central tectonic belt. Principal traps belong to reverse-thrust anticline traps and composite traps of structure-lithology formed during the east (late) Andes episode respectively in the western and eastern tectonic belts.

Key words: Oriente basin, unconformity, type, structure, petroleum migration, petroleum accumulation

CLC Number:

TE111.1

DING Zeng-yong, CHEN Wen-xue, XIONG Li-ping, LIN Wei-dong, XU Hua-ming, TIAN Na-xin. Tectonic Evolution in Oriente Basin of Ecuador[J]. Xinjiang Petroleum Geology, 2010, 31(2): 211-215.

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