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Abstract
Chapter from: M
62: Petroleum Basins of South America
Edited by
A. J. Tankard, R. Suarez Soruco, and H. J. WelsinkAuthors:
H. R. Balkwill, G. Rodrigue, F. I. Paredes, and J. P. Almeida Basin and Aerial Analysis/Evaluation
Published 1995 as
part of Memoir 62
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Northern
Part of Oriente Basin, Ecuador:
Reflection Seismic
Expression of Structures
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H. R. Balkwill
G. Rodrigue
Petro-Canada Resources,
Calgary, Alberta, Canada
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F. I. Paredes
J. P. Almeida
Tripetrol Petroleum Ecuador
Quito, Ecuador
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Abstract
Industry reflection
seismic profiles from the northern part of the Oriente basin display families
of basement-rooted structures ranging in age from early Mesozoic (and possibly
Permian) to Quaternary. We interpret the Mesozoic-Cenozoic structures to
be kinematically and chronologically compatible with tectonic events displayed
in the contiguous Andean Cordillera. Late Triassic (and Permian?) extensional
structures may have been linked to an intra-Cordilleran rift regime. Widely
developed Late Jurassic-Early Cretaceous convergent structures are coeval
with transpression along the western margin of the South American plate.
Late Cretaceous and Cenozoic convergent structures are responses to major
episodes of plate marginal terrane accretion and plate convergence. Late
Cretaceous and Cenozoic phases of structuring are displayed on seismic
profiles as a network of steeply dipping northward-trending faults that
have risen from Precambrian crystalline basement into the Phanerozoic cover
rocks. Northward-elongated sharply hinged folds generated in cover rocks
by slip on basement faults are traps for Oriente basin oil fields.
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