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AAPG Bulletin

Abstract

AAPG Bulletin, V. 101, No. 4 (April 2017), P. 505-513.

Copyright ©2017. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/011817DIG17029

Intact seismic-scale platforms and ramps in the Lower to Middle Jurassic of Morocco: Implications for stratal anatomy and lithofacies partitioning

Óscar Merino-Tomé,1 Giovanna Della Porta,2 Aurelien Pierre,3 Jeroen A. M. Kenter,4 Christophe Durlet,5 and Klaas Verwer6

1Departamento de Geología, Universidad de Oviedo, c/ Jesús Arias de Velasco, s/n, 33006-Oviedo, Spain; [email protected]
2Earth Sciences Department, Milan University, Via Mangiagalli 34, Milan 20133, Italy; [email protected]
3Repsol Oil & Gas Canada Inc., 2000, 888 3rd St. SW, Calgary, Alberta T2P 5C5, Canada; [email protected]
4Centre Scientifique et Technique Jean Féger (CSTJF), Total, Avenue Larribau, 64018 Pau, France; [email protected]
5UMR CNRS 6282 Biogéosciences, Université de Bourgogne, 6 bd Gabriel, 21000 Dijon, France; [email protected]
6Statoil ASA, Svanholmen 8, N-4035 Stavanger, Norway; [email protected]

ABSTRACT

The Jurassic carbonate platforms of the central High Atlas in Morocco are well known for several high-quality outcrops. In the central High Atlas, there are two complementary locations that offer critical lessons for our understanding of Jurassic carbonate system evolution in extensional basins: a Lower Jurassic high-relief, carbonate platform with steep slopes that developed on the footwall of a rotating fault block in an active half-graben (Djebel Bou Dahar [DBD]) and an upper Lower to Middle Jurassic low-angle prograding carbonate ramp rich in ooids (Amellago ramp [AR]). The DBD and AR outcrops provide superbly exposed, structurally intact, and fully accessible platform to basin transects. They provide valuable analogs for depositional geometries at reservoir and seismic scales that are highly relevant for hydrocarbon exploration and production. The DBD serves as an analog for isolated carbonate platforms developed in rift basins (particularly synrift carbonate platforms with a coral calcareous sponge and microbial boundstone facies belt in the upper slope and margin). The AR provides one of the rare examples whereby a large-scale oolitic ramp can be examined in great detail, providing an analog for a range of oolitic reservoirs, mostly Mesozoic.

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