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University of Business Academy in Novi Sad (2020)

The problems of productive water wells in Ghadames area northwest Libya - Study in water geography

Auhida Adel Ahmad, Maktuf

Titre : The problems of productive water wells in Ghadames area northwest Libya - Study in water geography

Problemi u proizvodnji bunarske vode u Gadamesu – područje severozapadne Libije

Auteur : Auhida Adel Ahmad, Maktuf

Université de soutenance  : University of Business Academy in Novi Sad,

Grade : Doctoral dissertation 2020

Résumé
The current study explores the phenomena of sudden rise of salinity, lack of hydrostatic pressure and productivity decline in the water of some wells of deep underground reservoir in Kikla Formation, Ghadames Basin, Northwest Libya. A case study is conducted on some selected wells that have experienced these phenomena in Kiklah Formation. To learn more on the nature of these phenomena, the study focuses on their evolution, the main causes accounting for their occurrence, manifestations indicating them, field tests confirming their existence, and the steps required to avoid their occurrence. Basically, the study uses a descriptive approach to examine the natural, geological and hydrogeological characteristics of the region, identify the technical and operational specifications of the wells in the selected sites, and highlight problems associated with water resources in the region. The study also uses an analytical approach to provide detailed interpretations and representations of the results obtained from chemical analyses of water samples collected from thirteen wells within the boundaries of the study area as well as water samples for seven wells with significantly high levels of salinity. In general, the present study depends on the information from previous studies, field visits and laboratory tests. Statistically, results of the study are represented by a set of figures, tables, manuscripts and illustrations to facilitate the explanation and clarification of concepts related to the phenomena studied. The study draws many conclusions regarding the problems related to the selected wells, particularly with regard to design and specifications of processing, interpolation and declining productivity and efficiency and the low quality of water in the region. The study also finds out the key elements that cause and accelerate the spread of the phenomena of high salinity, lack of pressure and productivity decline in the wells. These elements include the technical reasons, design reasons and other reasons related to intensive exploitation. The study concludes a set of recommendations that relate to the removal of the layers and formations above the Kiklah aquifer during casing processes in future designs for wells in the region as the main source of the sudden rise of salinity. It is also recommended that exploitation of wells should be stopped as it has been reported as the main cause of sudden rise of salinity. Likewise, deterioration of water quality and pollution of water aquifer should be prevented by creating a network of surveillance to track water levels and quality periodically. There is also the need for coordination with neighboring countries exploiting the basin to modernize the well models in the basin regularly and follow the changes that occur in the wells quantitatively and qualitatively to ensure optimum utilization in the present and the future.

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Page publiée le 5 juin 2021