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Phanerozoic magmatism in the Parnaíba Basin: characterization of igneous bodies (well logs and 2D seismic sections), geometry, distribution and sill emplacement patterns

By
I. Trosdtorf, Jr
I. Trosdtorf, Jr
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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J. M. Morais Neto
J. M. Morais Neto
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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S. F. Santos
S. F. Santos
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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C. V. Portela Filho
C. V. Portela Filho
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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T. A. Dall Oglio
T. A. Dall Oglio
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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A. C. M. Galves
A. C. M. Galves
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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A. M. Silva
A. M. Silva
Petróleo Brasileiro S.A., E&P/Exploração, Avenida República do Chile, 330, Rio de Janeiro, RJ, Brazil
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Published:
January 01, 2018

Abstract

The Parnaíba Basin, like other Brazilian Paleozoic intracratonic basins, contains intrusive igneous bodies in its sedimentary section in the form of dykes and, mainly, thick sills. The identification of the geometry and the emplacement mechanism are important for the determination of the traps controlling gas and/or oil accumulations. A variety of models available in the literature suggests a complex relationship between the magma and the host rock. Several factors, such as the density and pressure of the magma injection, steam generation, regional and local stress fields, and the rheology of the host rock, work together controlling emplacement, expansion and the final geometry of intrusions in the sedimentary column. Well logs show a conspicuous signature (e.g. gamma-ray curve with paunchy feature) for the igneous bodies (sills). Many sills occur parallel to the bedding, generally intruding thick sections of shales along the contact of the lithostratigraphic units of the Longá-Poti, Pimenteiras-Cabeças and Tianguá-Jaicós formations. Seismic sections reveal a variety of geometries, including layer parallel, saucer-shaped, planar transgressive and fault block. By far the most common sill geometry is the layer parallel, which is able to reach up to hundreds of kilometres in extent, and has minimal thickness ranging between 2 and 5 m, and with a maximum of around 250 m.

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Contents

Cratonic Basin Formation: A Case Study of the Parnaíba Basin of Brazil
CONTAINS OPEN ACCESS

M. C. Daly
M. C. Daly
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R. A. Fuck
R. A. Fuck
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J. Julià
J. Julià
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D.I.M. MacDonald
D.I.M. MacDonald
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A. B. Watts
A. B. Watts
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Geological Society of London
Volume
472
ISBN electronic:
9781786204127
Publication date:
January 01, 2018

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