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Hydrocarbon source potential of the Santiago Formation, Oriente Basin, SE of Ecuador


Gaibor, J; Hochuli, P A; Winkler, W; Toro, J (2008). Hydrocarbon source potential of the Santiago Formation, Oriente Basin, SE of Ecuador. South American Journal of Earth Sciences, 25(2):145-156.

Abstract

The Santiago Formation (Late Hettangian–Sinemurian), described in the area of Santiago in the Oriente Basin of eastern Ecuador, consists of three distinct sedimentary members. The Santiago River Member is composed of limestones and calcareous sandstones. The Yuquianza Member is a monotonous sequence of black shales. The Patuca Member consists of a sequence of sandstones, greywackes, and shales, intercalated with lava flows and dikes. The fine-grained sediments of the three members are characterized by a high content of particulate organic matter (POM). Palynofacies and rock-eval analyses indicate the predominance of kerogen types II and III, with HI values that indicate a moderate to low source potential. At the type locality, the organic matter is thermally mature and locally overmatures.

Abstract

The Santiago Formation (Late Hettangian–Sinemurian), described in the area of Santiago in the Oriente Basin of eastern Ecuador, consists of three distinct sedimentary members. The Santiago River Member is composed of limestones and calcareous sandstones. The Yuquianza Member is a monotonous sequence of black shales. The Patuca Member consists of a sequence of sandstones, greywackes, and shales, intercalated with lava flows and dikes. The fine-grained sediments of the three members are characterized by a high content of particulate organic matter (POM). Palynofacies and rock-eval analyses indicate the predominance of kerogen types II and III, with HI values that indicate a moderate to low source potential. At the type locality, the organic matter is thermally mature and locally overmatures.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Language:English
Date:March 2008
Deposited On:29 Jan 2009 08:36
Last Modified:05 Apr 2016 12:46
Publisher:Elsevier
ISSN:0895-9811
Publisher DOI:https://doi.org/10.1016/j.jsames.2007.07.002

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