Table of Contents
ISRN Environmental Chemistry
Volume 2013, Article ID 709190, 14 pages
http://dx.doi.org/10.1155/2013/709190
Research Article

Hydrocarbons Migration through Groundwater Convergence toward Saline Depressions: A Case Study, Sidi El Hani Discharge Playa, Tunisian Sahel

1National Engineering School of Sfax, University of Sfax, Road of Soukra, km 4, 3038 Sfax, Tunisia
2RU: Sedimentary Dynamics and Environment (DSE) (Code 03/UR/10-03), National Engineering School of Sfax, University of Sfax, 3038 Sfax, Tunisia
3Laboratory of Water Energy and Environment, National Engineering School of Sfax, University of Sfax, 3038 Sfax, Tunisia
4Faculty of Sciences of Sfax, University of Sfax, Road of Soukra, km 4, 3038 Sfax, Tunisia
5Higher Institute of Biotechnology of Monastir, Tahar Hadded Avenue, University of Monastir, Road Salem Bechir, BP n 56, 5000 Monastir, Tunisia

Received 30 May 2013; Accepted 31 July 2013

Academic Editors: W. K. Jo and Q. Zhou

Copyright © 2013 Elhoucine Essefi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper aims to provide proofs of hydrocarbons migration from petroleum reservoirs towards the surface of discharge playas. This is a case study of the discharge playa of Sidi El Hani, eastern Tunisia. The geochemistry of water of some hydrological drills in the Sahel area and of water from the discharge playa proves relatedness between the deep aquifer and the water of the discharge playa. Thus, the hydrology is now more than likely converging from the subsurface. This convergence may be an agent of transport of hydrocarbons. Concerning the organic matter within the discharge playa, high percentages of different fractions seem abnormal in such a saline context. This maturated organic matter should be viewed in the widest context of a multidisciplinary study taking into account the presence of petroleum potentials in the subsurface, the converging hydrogeology, and the tectonised region. The high percentage of Aromatic Polycyclic Hydrocarbon (APH) may be the result of hydrocarbons migration rather than anthropogenic pollution. As for the reinterpretation of previous works about the organic matter in playas done in sebkha Moknine, the contaminated organic matter, which was interpreted as a human induced activity, may have another origin from a reservoir located in the subsurface of the Sahel area.