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Abstract

AAPG Bulletin, V. 84, No. 2 (February 2000), P. 266-287.

Hydrocarbon Potential of the Mississippian Carbonate Platform, Bechar Basin, Algerian Sahara1

Achour Madi,2 Martine M. Savard,3 Pierre-André Bourque,4 and Guoxiang Chi3

©Copyright 2000. The American Association of Petroleum Geologists. All rights reserved.
1Manuscript received July 9, 1998; revised manuscript received June 15, 1999; final acceptance September 3, 1999.
2Department de Geology et de Genie Geologique, Université Laval, Ste-Foy, Qc, Canada, G1K 7P4. Present address: Petrel Robertson Ltd., 1700, 300 - 5th Avenue SW, Calgary, AB, Canada, T2P 3C4; e-mail: djam@cadvision.com
3Centre Geoscientifique de Quebec, Geological Survey of Canada, Quebec, 2535 Bd. Laurier, CP. 7500, Ste Foy, Qc, Canada, G1V 4C7.
4Department de Geology et de Genie Geologique, Université Laval, Ste-Foy, Qc, Canada, G1K 7P4.
This paper is part of a Ph.D. dissertation by Achour Madi at Laval University, Quebec. We thank Peter Putnam (Petrel Robertson Ltd.) for constructive comments on an earlier draft of this paper. We are indebted to Sonatrach-Exploration, Algeria, for field work support and assistance in geological data supply. A. Madi is particularly indebted to Abdelmadjid Attar (former manager of Sonatrach-Exploration) for his support. The work also has been supported by Geological Survey of Canada funds to M. M. Savard and an individual research grant to P. A. Bourque from the Natural Sciences and Engineering Research Council of Canada. Editorial comments from J. Warme and I. Hutcheon were very helpful in clarifying portions of the text.

ABSTRACT

The western Bechar basin contains a 1500-2000-m-thick Mississippian succession of carbonates consisting of superposed shoaling-upward sequences, whose porosity or diagenesis have never been investigated to establish the reservoir potential of these carbonates. In this paper, we present a diagenetic and porosity evolution of the Visean part of the Mississippian carbonate platform that may lead to the development of new exploration fairways in the region. A diagenetic model is proposed in which ooid and crinoid grainstones may have a reservoir potential if hydrocarbon migration occurred before the end of the Serpukhovian, prior to complete occlusion of porosity.

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