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An unusual Proterozoic petroleum play in Western Africa: the Atar Group carbonates (Taoudeni Basin, Mauritania)

By
Antonio Martín-Monge
Antonio Martín-Monge
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Roger Baudino
Roger Baudino
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Luis M. Gairifo-Ferreira
Luis M. Gairifo-Ferreira
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Rafael Tocco
Rafael Tocco
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Marcello Badalì
Marcello Badalì
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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María Ochoa
María Ochoa
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Sigit Haryono
Sigit Haryono
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Sofía Soriano
Sofía Soriano
2
Repsol Services Company, 2001 Timberloch Place #3000, Spring, TX 77380, USA
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Nidal El Hafiz
Nidal El Hafiz
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Julio Hernán-Gómez
Julio Hernán-Gómez
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Beatriz Chacón
Beatriz Chacón
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Ignacio Brisson
Ignacio Brisson
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
3
Present address: YPF SA, Macacha Güemes 515, 1425 Buenos Aires, Argentina
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Giovanni Grammatico
Giovanni Grammatico
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
4
Present address: Dana Petroleum, 62 Huntly Street, Aberdeen AB10 1RS, UK
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Roberto Varadé
Roberto Varadé
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Hussein Abdallah
Hussein Abdallah
1
Repsol Exploración SA, calle de Méndez Álvaro, 44, 28045 Madrid, Spain
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Published:
January 01, 2017

Abstract

The Taoudeni Basin is the largest sedimentary basin in Africa. This intracratonic basin, which forms the sedimentary cover of the West African Craton, records episodic sedimentation since the Proterozoic. It is a largely unexplored basin, with only eight exploration wells drilled to date, although its petroleum prospectivity was established in 1974 when gas and liquids were tested in the Abolag-1 well. This paper focuses on the identification and assessment of potential source rocks and reservoirs in the Taoudeni Basin in Mauritania and aims to establish a geochemical genetic link between the occurrence of petroleum and potential sources. Various disciplines and techniques were integrated to reach a better understanding of the petroleum systems potentially existing in this basin. We also define and describe the elements and processes of the Atar-Atar (!) petroleum system. This study is an example of the exploration of an unusual and high-risk play in some of the oldest sedimentary rocks on Earth, with a long, polyphase structural evolution, a complex thermal history (where burial might not be the only controlling factor), a massively diagenetized carbonate reservoir, and large uncertainties on the timing of generation, trap formation and preservation.

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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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