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Title: Structural and hydrogeological features of a Lias carbonate aquifer in the Triffa Plain, NE Morocco
Authors: Sardinha, João
Carneiro, Júlio
Zarhloule, Yassine
Barkaoui, Alae Eddine
Correia, António
Boughriba, Mimoun
Rimi, Abdelkrim
Houadi, B. El
Keywords: Lias carbonate aquifer
Geological structure
Resource assessment
NE Morocco
Issue Date: 2012
Publisher: Elsevier
Abstract: The rising demand for water and the contamination of shallow water table aquifers has led authorities in NE Morocco to look for deeper groundwater resources in the Triffa Plain, namely in Lower Jurassic (Lias) dolomitic limestones. The liassic aquifer is of strategic importance for the development of the region, however, its hydrodynamic behaviour is poorly understood due to lack of hydrogeological data and block structure. This article presents a first effort towards understanding the structure and hydraulic behaviour of the aquifer. Exploration borehole data and results from geophysical campaigns were integrated into a GIS environment to build a preliminary model of the aquifer structure. The aquifer behaves as an unconfined aquifer in the northern part of the Béni Snassen Mountains (the recharge area), but as it dips to the north, it becomes confined by marls and shales of the Middle/Upper Jurassic. Even though piezometric level data are scarce, a tentative piezometric map was produced. Three blocks separated by NW–SE trending faults in a horst and graben structure, with distinct flow behaviours were identified: Berkane, Fezouane and Sidi Rahmoun blocks. Those blocks also show differences in hydraulic conductivity distribution. As a result of the reaction with the dolomitic limestones, the groundwater is of calcium-magnesium bicarbonate type. Groundwater temperature as measured in springs ranges from 29 C to 37 C in springs and constitutes a potential low enthalpy geothermal resource.
Type: article
Appears in Collections:CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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