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Unravelling the along-strike variability of the Angola–Gabon rifted margin: a mapping approach

By
Gwenn Péron-Pinvidic
Gwenn Péron-Pinvidic
NGU Geological Survey of Norway, Leiv Eirikssons vei 39, 7040 Trondheim, Norway
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Gianreto Manatschal
Gianreto Manatschal
Strasbourg University, 1 rue Blessig, 67084 Strasbourg, France
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Emmanuel Masini
Emmanuel Masini
TOTAL, ISS/STRU, Avenue Larribau, 64018 PAU Cedex, France
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Emilie Sutra
Emilie Sutra
Paul Scherrer Institut, Laboratory for Energy Systems Analysis, 5232 Villigen PSI, Switzerland
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Jean Marie Flament
Jean Marie Flament
Total SA – Exploration Production/Projects Nouveaux, 2 place Jean Millier, La Défense 6, 92078 Paris la Défense Cedex, France
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Isabelle Haupert
Isabelle Haupert
Strasbourg University, 1 rue Blessig, 67084 Strasbourg, France
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Patrick Unternehr
Patrick Unternehr
Total SA – Exploration Production/Projects Nouveaux, 2 place Jean Millier, La Défense 6, 92078 Paris la Défense Cedex, France
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Published:
January 01, 2017

Abstract

We summarize here observations from the South Atlantic Angola–Gabon rifted margin. Our study was based on the interpretation of a selection of deep penetration depth-migrated seismic reflection profiles. We describe here the large-scale dip architecture of the margin under five structural domains (proximal, necking, distal, outer and oceanic) and list their characteristics. We investigated the necking domain further and discuss the architecture of the distal domain as a combination of hyper-extended crust and possible exhumed mantle. The mapping and characterization of these domains, at the margin-scale, allow us to illustrate the along-strike structural and stratigraphic variability of the margin. We interpret this variability as the result of a shift from an upper plate setting to a lower plate setting. This shift is either sharp, typified by a major regional normal fault on the northern flank of a residual hanging-wall block, identified offshore Cabinda–Zaire, or more diffuse to the south. First-order screening of conjugate profiles confirmed the segmentation and structural characteristics of the transfer zones. The dataset studied also allowed the identification of key sections that can be considered as type examples of upper plate and lower plate margins and which allow us to discuss the characteristics of these end-member settings.

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Contents

Geological Society, London, Special Publications

Petroleum Geoscience of the West Africa Margin

T. Sabato Ceraldi
T. Sabato Ceraldi
BP Exploration, UK
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R. A. Hodgkinson
R. A. Hodgkinson
Dana Petroleum, UK
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G. Backe
G. Backe
BP Exploration (Epsilon) Ltd, Oman
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Geological Society of London
Volume
438
ISBN electronic:
9781786203106
Publication date:
January 01, 2017

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