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Book Chapter

Linked Extensional-compressional Tectonics in Gravitational Systems in the Equatorial Margin of Brazil

By
Maria José R . Oliveira
Maria José R . Oliveira
Petrobras Research Center, Avenida Horácio Macedo, 950, Cidade Universitária, Rio de Janeiro, Brazil (e-mail: mjoliveira@petrobras.com.br)joao.caldeira@yahoo.com.bratanaka@petrobras.com.brtrosdtorf@petrobras.com.br
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Paulo Santarem
Paulo Santarem
Petrobras Research Center, Avenida Horácio Macedo, 950, Cidade Universitária, Rio de Janeiro, Brazil (e-mail: mjoliveira@petrobras.com.br)joao.caldeira@yahoo.com.bratanaka@petrobras.com.brtrosdtorf@petrobras.com.br
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Anderson Moraes
Anderson Moraes
Petrobras Research Center, Avenida Horácio Macedo, 950, Cidade Universitária, Rio de Janeiro, Brazil (e-mail: mjoliveira@petrobras.com.br)joao.caldeira@yahoo.com.bratanaka@petrobras.com.brtrosdtorf@petrobras.com.br
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Pedro V. Zalán
Pedro V. Zalán
Petrobras/E&P (Exploration and Production)-Exp, Avenida República do Chile 330/16th floor, Rio de Janeiro, Brazil (e-mail: pvzalan@uol.com.brpaulosantarem@petrobras.com.brandersonmoraes@petrobras.com.br
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João L. Caldeira
João L. Caldeira
Petrobras/E&P (Exploration and Production)-Exp, Avenida República do Chile 330/16th floor, Rio de Janeiro, Brazil (e-mail: pvzalan@uol.com.brpaulosantarem@petrobras.com.brandersonmoraes@petrobras.com.br
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Arnaldo Tanaka
Arnaldo Tanaka
Petrobras/E&P (Exploration and Production)-Exp, Avenida República do Chile 330/16th floor, Rio de Janeiro, Brazil (e-mail: pvzalan@uol.com.brpaulosantarem@petrobras.com.brandersonmoraes@petrobras.com.br
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Ivo Trosdtorf Jr.
Ivo Trosdtorf Jr.
Petrobras/E&P (Exploration and Production)-Exp, Avenida República do Chile 330/16th floor, Rio de Janeiro, Brazil (e-mail: pvzalan@uol.com.brpaulosantarem@petrobras.com.brandersonmoraes@petrobras.com.br
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Published:
January 01, 2013

Abstract

The Pará-Maranhão and Barreirinhas basins in the equatorial margin of Brazil contain gravitational gliding systems composed of three structural domains: a proximal extensional, a distal contractional, and a transitional (or translational) domain between the two others. The main faults of these domains detach on a decollement surface of shales and marls, presumably overpressured. Several methods were applied to investigate these thin-skinned tectonics systems, including interpretation of seismic sections, physical modeling, numerical modeling, restoration of cross sections, and integration with field data. These methods indicated that thrusts developed in a classical backstepping sequence with younger thrusts developing in the hanging wall and with landward migration of depocenters through geologic time. Out-of-sequence thrusts were observed locally. The results of cross section restorations suggested that the total amount of shortening exceeded the total amount of stretching in the basal layers, close to the detachment surface, whereas stretching exceeded shortening in the upper layers. Our conclusions point out that gravitational gliding was caused by the combined effect of sedimentary loading, slope gradient, and probably, pore fluid overpressure, with gliding events being triggered by episodic reactivations of the intervening Romanche and Saint Paul fracture zones.

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Contents

AAPG Memoir

Tectonics and Sedimentation: Implications for Petroleum Systems

Dengliang Gao
Dengliang Gao
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American Association of Petroleum Geologists
Volume
100
ISBN electronic:
9781629810010
Publication date:
January 01, 2013

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