https://dspace.univ-ouargla.dz/jspui/handle/123456789/251 Mon, 26 Oct 2026 06:15:18 GMT 2026-10-26T06:15:18Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41772 Titre: L’Intégration De la Tomographie de Résistivité Electrique, Processus de Hiérarchisation Analytique et L’Intelligence Artificielle Pour Cartographier Les Zones De L’aléa Des Glissements De Terrain (Etude De Cas –Wilaya De Guelma-) Auteur(s): Belghoul, Feryel Résumé: Les glissements de terrain représentent un aléa naturel majeur dans le nord de l'Algérie, où la conjugaison de formations géologiques instables, de reliefs accidentés et de précipitations intenses crée des conditions particulièrement propices aux instabilités gravitaires. Le bassin versant Côtiers Guelma constitue à ce titre un territoire à fort risque, insuffisamment cartographié jusqu'à présent. Ce travail propose une approche hybride intégrée combinant l'analyse multicritère AHP, la modélisation spatiale SIG et la validation géophysique par tomographie de résistivité électrique ERT, afin de produire une carte de susceptibilité aux glissements de terrain couvrant l'ensemble du bassin versant à l'échelle régionale. Les résultats obtenus montrent que les facteurs lithologiques et morphologiques dominent la prédisposition aux glissements dans ce contexte géoenvironnemental. La carte de susceptibilité produite, classifiée en cinq niveaux, a été validée statistiquement et confirmée sur le terrain par les profils géophysiques ERT, démontrant la fiabilité et la cohérence de la méthodologie adoptée. Ce travail constitue un outil d'aide à la décision directement exploitable pour la gestion des risques naturels, la planification territoriale et la protection des populations dans le nord-est algérien Description: UNIVERSITE KASDI MERBAH – OUARGLA – FACULTE DES HYDROCARBURES, DES ENERGIES RENOUVABLE ET SCIENCES DE LA TERRE ET DE L’UNIVERS Département des Sciences de la Terre et de l’Univers En Vue De L’obtention Du Diplôme de Master en Géologie Option : Géophysique Appliquée Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41772 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41747 Titre: Caracterization of drilling fluid by adding natural product Auteur(s): HASNAOUI, OUSSAMA Résumé: This study investigates the use of natural additives—namely cellulose nanofibers (CNF), flaxseed gel, and shea gel—as environmentally friendly alternatives to conventional synthetic polymers in water-based drilling fluids (WBDFs). CNF was extracted from wheat straw through alkaline treatment, bleaching, and ultrasonication. Flaxseed and shea gels were prepared using hot water extraction and cold soaking, respectively. The rheological and filtration properties of WBDFs containing these additives at concentrations of 0.1%, 0.3%, and 0.5% were evaluated and compared with polyanionic cellulose (PAC) at 1% and 2%. Results showed that CNF at 0.5% achieved an apparent viscosity of 50–58 cP and reduced API filtrate volume to 4–6 mL, outperforming PAC at 2% (45–50 cP and 5–7 mL). Synergistic combinations of CNF and flaxseed gel exhibited up to 55% improvement in gel strength. Natural additives demonstrated comparable or superior performance to PAC at significantly lower concentrations, offering a sustainable and cost-effective alternative for drilling fluid formulations Description: Université KASDI MERBAH OUARGLA Faculté des Hydrocarbures, des Energies Renouvelables et des Sciences de la Terre et de l’Univers Département : Forage et Mécanique des chantiers pétroliers Mémoire MASTER PROFESSIONNEL Domaine : Sciences et techniques Filière : Hydrocarbures Spécialité : Forage Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41747 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41705 Titre: Analysis and mitigation of wellbore instability in drilling operations, case study: Hassi MESSAOUD field Auteur(s): DJEBLI, Omar; BOUTEGHMES, Fateh; BELHI, Ayoub Résumé: The research investigates the causes of wellbore instability during drilling operations by using a geomechanical-based method focusing on the Hassi Messaoud Field as a case study. This study's primary aims to develop a 1D Mechanical Earth Model (MEM) that can assist to analyse and mitigate of drilling hazards like mud losses, stuck pipe, and non-productive time by integrating drilling reports, well logs, core test data, and laboratory results. Estimated in-situ stresses, pore pressures, rock mechanical properties, and safe mud weight window (MW) will be derived by utilizing a fully integrated database of previously collected data from both drilled offset wells and analysis of those wells in conjunction with either a pilot or a horizontal wellbore to predict wellbore stability and optimize overall drilling performance. The findings of this study demonstrate that advanced geomechanics modelling significantly enhances safe drilling process and wellbore design. Some limitations may arise from rock property assumptions as well as not considering all aspects of full anisotropic properties. overal, this study will prove that geo-mechanics play an important role in enhancing both the safety and effectiveness of drilling activities. Description: Algerian Democratic Republic and Popular Ministry of Higher Education and Scientific Research University of KASDI MERBAH OUARGLA Faculty of Hydrocarbons, Renewable Energies and Earth and Universe Sciences Department of drilling and petroleum field mechanics THESIS MASTER’S DEGREE Domain: Sciences and Technologies Field: Hydrocarbons Speciality: Professional drilling Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41705 2026-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/41695 Titre: Processing and interpretation of aeromagnetic data from the TFT region (Illizi Basin) Auteur(s): TOUMI, ABD ELHAFID Résumé: This Master thesis presents the processing and interpretation of aeromagnetic data from the Tin Fouyé–Tabankort (TFT) region in the Illizi Basin, southeastern Algeria. The study aims to extract geological and structural information relevant to hydrocarbon exploration by analyzing a legacy 1972 airborne magnetic survey. The methodology includes reduction to the pole (RTP), energy spectrum analysis, upward continuation, derivative filtering, and three-dimensional Euler deconvolution. Results reveal three dominant source depth ranges: shallow (0.6–2.0 km), intermediate (2.0–4.2 km), and deep (4.2–9.2 km), corresponding to the Mesozoic cover, the Paleozoic succession, and the Precambrian basement, respectively. The processed maps clearly delineate major north–south fault systems and the northeast-dipping monocline of the Amassak field, consistent with known geological structures. Euler deconvolution indicates source depths between 0.5 and 3.5 km, correlating with reservoir-bearing horizons. This work demonstrates that legacy aeromagnetic data, when properly processed, provide valuable constraints on basin architecture and fault geometry, thereby supporting hydrocarbon exploration in the Illizi Basin Description: KASDI MERBAH UNIVERSITY- OUARGLA FACULTY OF HYDROCARBONS, RENEWABLE ENERGIES, AND EARTH & UNIVERSE SCIENCES DEPARTMENT OF EARTH AND UNIVERSE SCIENCES Academic Master’s Thesis Field: Earth and Universe Sciences Specialty: Applied Geophysics Thu, 01 Jan 2026 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/41695 2026-01-01T00:00:00Z