قسم علم الجيولوجيا

المزيد ...

حول قسم علم الجيولوجيا

دفع ظهور النفط في ليبيا، في نهاية خمسينيات القرن الماضي، كلية العلوم إلى التعاون مع شركات النفط العاملة بليبيا آنذاك وإنشاء قسم الجيولوجيا سنة 1960م. وقد تأسس القسم بعضوهيئة تدريس واحد وعدد 13 طالبا. وسرعان ما رسخ بناءه كقسم جيولوجيا متكامل يغطي الفروع الأساسية من علوم الأرض، وقبل تخرج أول دفعة منه سنة 1964م أصبحت المعامل الرئيسية مكتملة والمراجع متوفرة وبه عدد 6 من أعضاء هيئة التدريس و77 طالباً.

وضع القسم من أولوياته بناء الكوادر الوطنية حيث تم إرسال العديد من الخريجين المتفوقين في الدفعات الأولى إلى جامعات ذات مستوى رفيع في الولايات المتحدة الأمريكية والمملكة المتحدة للدراسات العليا والذين تمكنوا من استكمال دراساتهم في أعرق الجامعات مؤكدين بذلك على متانة التعليم الجيولوجي بقسم الجيولوجيا وهو نسق أستمر إلى الآن حيث استطاع كل خريجي القسم الذين ابتعثوا للدراسة بالخارج من الشركات والمؤسسات المختلفة استكمال دراستهم العليا في مختلف جامعات العالم دون عراقيل تذكر. إن نجاح خريجي القسم في حياتهم المهنية في المؤسسة الوطنية للنفط وشركاتها والشركات الأجنبية العاملة في ليبيا وكذلك في قطاعات البحث العلمي والتخريط الجيولوجي والكشف عن المعادن وفي قطاع المياه لخير دليل على استقرار البرامج التعليمية بالقسم وتمكنها من تلبية الحاجات الأساسية لكل هذه القطاعات.

أقام قسم الجيولوجيا سنة 1969 مؤتمراً جيولوجياً على مستوى عالمي صدرت مجموعة أبحاثه في مجلد يعد أول توثيق علمي عن جيولوجية ليبيا باللغة الانجليزية. وقد شجع نجاح هذه الندوة القسم على الاستمرار وعقد الحلقة الثانية سنة 1978م والثالثة سنة 1987م حيث كانت حصيلتهما 7 مجلدات تمثل إلى الآن مرجعاً أساسياً عن جيولوجية ليبيا ونشرتا عن داري جون وأيلي الإنجليزية والسيفير الهولندية المرموقتين ولازالت تلك المجلدات تلقي طلباً عالمياً من المكتبات العلمية حول العالم.

لم يتوانى قسم الجيولوجيا عن أداء واجباته في إمداد عجلة التنمية والتطوير في البلاد بالعناصر المؤهلة والمدربة في مختلف التخصصات الجيولوجية الحديثة في مجالات جيولوجية النفط والمعادن والمياه والتخريط الجيولوجي ودراسة التكوينات الجيولوجية في جميع ربوع ليبيا، ولعل المنشورات العلمية لهذه القطاعات خير شاهد على هذا الثراء العلمي.

تم تخريج المئات من الجيولوجيين من القسم والذين يعملون في الجامعات وشركات النفط والمؤسسة الوطنية للنفط والمعهد الليبي للنفط وجهاز النهر الصناعي ومركز البحوث الصناعية والهيئة العامة للمياه والقوات المسلحة والمركز الليبي للاستشعار عن بعد وعلوم الفضاء ومركز البيروني للاستشعار عن بعد ومؤسسة الطاقة الذرية والمؤسسة الوطنية للتعدين والعديد من مؤسسات وشركات الدولة والقطاع الخاص وقد ترأس خريجوه الوزارات والهيئات والمؤسسات والقطاعات العلمية ومراكز البحث العلمي والجامعات والكليات العلمية خلال الخمس عقود الماضية إضافة إلى التمثيليات الدولية في اليونيسكو وغيرها.

أصبح قسم الجيولوجيا أحد التخصصات العلمية التطبيقية بالكلية العلمية الأم في ليبيا ويعتبر أحد الدعائم الأساسية والمتينة التي تعتمد عليها نهضة وتقدم ليبياالحديثة، نظراً لمشاركته الفعالة في تنفيذ برامج وخطط التنمية وذلك بمساهمة أعضاء هيئة التدريس والخريجين في تقديم الاستشارات العلمية وتنفيذ بعض المشاريع البحثية للعديد من شركات النفط والقطاعات الأخرى التابعة للدولة والقطاع الخاص حسب الأسس والمعايير البحثية العلمية العالمية.

ينظم قسم الجيولوجيا رحلات حقلية تدريبية وبحثية مستمرة لمنطقة جبل نفوسة كما نظم رحلات إلى مناطق مختلفة من ليبيا مثل الجبل الأخضر والجفرة والهروج وواو الناموس ووادي موريزيدي واوزو بتيبستى والقرقاف ودور الطلح وجبل السوداء وغيرها.

أصبح قسم الجيولوجيا المقر الدائم للجمعية الليبية لعلوم الأرض منذ إعادة اشهارها سنة 1974م والتي لها نشاط علمي مميز تمثل في نشر العديد من وقائع المؤتمرات الجيولوجية التي عقدتها عبرالسنين والتي أصبحت من الوثائق الهامة والمعتمدة عالمياً والتي ساهم أساتذته في الإعداد لها وتحريرها.

حقائق حول قسم علم الجيولوجيا

نفتخر بما نقدمه للمجتمع والعالم

7

المنشورات العلمية

155

الطلبة

63

الخريجون

البرامج الدراسية

منشورات مختارة

بعض المنشورات التي تم نشرها في قسم علم الجيولوجيا

Origin and Geologic Evaluation of Umm Ar Razam Clays Al Faidiyah Formation, NE Libya

Abstract The study area is located in and around Umm Ar Razam village, about 50 Km east of Darnah city, north-eastern Libya. In this study many claystone sections were studied. These claystones belong to the lowermost part of Al Faidiyah formation of Upper Oligocene – Lower Miocene age. The studied sections consist of claystone beds ranging in thickness about 10 meters. These bentonitic clays are generally grey to greenish grey in colour, with popcorn – like appearance. They have a waxy character and are exposed sporadically in this area as isolated outcrops. They might be deposited in lagoonal, lacustrine or shallow marine environment. The main purpose of this thesis is to study the origin and to evaluate the Umm Ar Razam bentonitic clays. For example, lithology, mineralogy, the chemical composition, crystal forms and habits, physical properties, industrial uses and treatment will be investigated. The Results showed that these clays consist of the minerals Na- montmorillonite, Kaolinite, and Illite. Non – clay minerals includes quartz, calcite, dolomite, gypsum, halite, muscovite, rutile, sanidine, and tridymite. Moreover, clay mineral fraction studies using the different techniques showed that these bentonitic clays were formed due to in situ alteration of volcanic ash in subaquous environment. Evidences for such an occurrence include mineralogical evidence as the existence of high temperature minerals as sanidine, rutile, and tridymite. The existence of unaltered volcanic ash as seen from SEM photomicrographs also supports this origin. Furthermore, XRF results showed downward depletion of silica right below these bentonitic clays 6 in calcarenite beds of Al Abraq formation. XRF results also showed that the Umm Ar Razam bentonites are in accordance with the American bentonites and the parent material of such bentonites came from basic volcanic ash materials. In addition, the viscosity and the filtration of Umm Ar Razam bentonite is nearly identical with the international bentonite by adding (Soda Ash) and (Na2 SiO3 ) with special treatment method. The cost of the Enhanced Umm Ar Razam bentonite is less than of the imported bentonite cost. Based on the physical and chemical properties these bentonites can be used in many industries especially as building materials and drilling fluids.
فيصل عياد أبو سهمين (2009)
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Geological study of the Early and Late Cretaceous Clastic Reservoirs in C-structure, Block nc-98, Al hameimāt Trough, Sirt Basin-Libya

Abstract The area of study is located in the southeastern part of Block NC98 and is informally named C-Structure area, and it is completely situated in the center of Al Hameimāt Trough, South East Sirt Basin, Libya. The main reservoir rock in this structure is the Upper Nubian Sandstone Member, whereas the Reworked Sandstone Unit and Transitional Beds are considered as secondary reservoir rocks. These reservoirs are mainly composed of sandstone to argillaceous sandstone. The Upper Nubian Sandstone reservoir quality is adversely affected by volcanic rocks especially the thick intercalation of volcanoclastics within the Upper Nubian Sandstone. The Upper Nubian Sandstone Member was deposited during Early Albian times. The Reworked Sandstone Unit was possibly deposited in Cenomanian? to Turonian times and may be related to the overlying Transition Beds.Up to date, four wells have been drilled in this structure (C1-NC98, C2-NC98, C3-NC98 and C4-NC98) and were targeting the clastic reservoirs of the Upper Nubian Sandstone and/or overlying Upper Cretaceous Transitional beds and Reworked Sandstone unit. Only C1-NC98 and C2-NC98 wells have tested significant hydrocarbon in the Upper Nubian and Reworked Sandstone unit whereas C3-NC98 and C4-NC98 wells have tested no hydrocarbon in both reservoirs and are abandoned as dry wells. This study is aimed to validate the stratigraphical aspects, depositional environment and reservoir quality assessment in order to decipher the reasons of drilled dry holes. The obtained results are anticipated to provide valuable geological information for the current and future prospect evaluation in the area. All available wire line logs of C wells (C1-NC98, C2-NC98, C3-NC98 and C4-NC98) and adjacent wells have been used to correlate the stratigraphy of the Pre-Upper and Upper Cretaceous silisiclastic sediments in the area of study.Representative core samples across the reservoir rocks of the candidate wells have been laid down for core description. The acquired results have been integrated with conventional core analysis and petrographic results to investigate the lithofacies characterization and depositional environment in order to sub-divide them into different lithofacies.Different types of geological maps have been prepared in this research (e.g. stratigraphical/structural cross sections, subcrop maps, isobach maps, structure contour maps and etc.) to delineate the formation extension and correlation. Burial history diagrams across all depositional sequences in the candidate wells were also prepared to identify the depositional scenario and to estimate the time span of tectonic subsidence along the depositional sequences.The results of all available geological studies which recently have been carried out by Waha Oil Company in the area of study and adjacent areas have been reviewed, elaborated and integrated with the results of this study to assess the discussion and final conclusion. The final results of sedimentological study indicates that there is no major effect of diagenetic processes on the reservoir rocks during and after the deposition. As a consequence, C3-NC98 and C4-NC98 wells were drilled in an area of poor reservoir quality of Reworked Sandstone and Upper Nubian reservoirs due to the existence of thick sequences of clay and siltstone which were mostly deposited in levee and over bank sub-environments of likely combined braided and meandering river. Whereas, C1 and C2-NC98 oil wells were drilled in an area of good reservoir quality of Reworked Sandstone and Upper Nubian Sandstone reservoirs where the sand bars sub-environment are deposited as a thick sequence of clean sands carrying the genetic of good reservoir properties. Therefore, the reservoir rocks in this area have different properties due to different sub-environment of deposition. This new results will probably assess the prospect generation and evaluation for the future drilling activity in the area of study.The encountered volcanoclastic sediments in well C2-NC98 reveals that this sediment is likely transported by river from the area of volcanic eruption to the area of deposition rather than in situ eruption. This type of volcano is likely applied to cinder cone volcano type where the pyroclastic fragments are not cemented together and thus easy to erode. Therefore, the intercalation of volcanoclastic sediment in Upper Nubian Sandstone has no marked effect in the reservoir rocks.Burial history curves of wells C1-NC98, C2-NC98, C3-NC98 and C4NC98 indicate three major subsidence events took place during Early Cretaceous time (Early Aptian - Early Albian), Late Cretaceous time (Turonian - Maastrichitian) and the Palaeocene - Eocene subsidence. However, Plaeocene - Eocene subsidence shows the highest subsidence rate with comparison to the other two subsidence rates.
محمد عمار هامان (2015)
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The Basaltic Intrusions of Central Jabal Nefusah Foothills

Abstract The basaltic Intrusions of the Central Jabal Nafūsah Foothills which extend from NW Wādi Zāret to NE Wādi Ghān Dām are part of the latest stage of Gharyān Volcanic Province (GVP). These intrusions are classified on basis of their shape and mechanism of emplacement into four kinds of volcanic bodies. These are; sheets (dykes and a sill), dykes associated with volcaniclasts, volcanic cone and lava mounds. Generally, the dyke emplacements are restricted only to the area between Wādi Zāret to Abū Ghaylān, while the other forms extend from Rās al Mazūl Dome to Wādi Ghān Dam. The more differentiated rocks are restricted to the area between Rās al Mazūl Dome and Wādi Ghān. Farther west towards Wādi Zāret, ultramafic xenoliths and magnesium-number increase, suggesting closer proximity to the source. The rocks are essentially alkaline with within Intraplate signatures. They straddle the composition from picrites, basanites, alkali basalts through hawaiites, mugearite to benmoreites with a compositional gap between the last two types. Generally, the phenocrysts are represented by foresteritic olivine, Cadiopsidic pyroxene, magnesiotaramitic amphibole, plagioclase, K-feldspar and titanomagnetite. The chemical composition of the mafic minerals indicates that they are high pressure phenocryst phases. The most primitive picrites satisfied the criteria of primary mantle melts. The rocks are generally, enriched in LILE suggesting an enriched mantle source. The studied rocks were grouped into five groups based on incompatible trace element ratios; Group-A includes picrite, basanites and hawaiites, and Group-B includes picrite (Z-3), basanites , alkali basalts, and hawaiites, while Group-C is formed of hawaiites, Group-D is composed of mugearite and Group-E is made up of benmoreites. Picrites and basanites of these rock have high Mg-number (>0.64), high Cr and Ni contents and strong light rare earth element enrichment, but systematic depletion in Rb, K and Ba relative to trace elements of similar compatibility in anhydrous mantle. Alkali basalts and more differentiated magmatic rocks have lower Mg-number and lower abundances of Ni and Cr, and have undergone fractionation of mainly olivine, clinopyroxene, Fe–Ti oxide, amphibole and plagioclase. The variation in the concentrations of major, trace, rare earth elements, and incompatible element ratios in the rock samples demonstrate the heterogeneous character of their source region. Such heterogeneity can be interpreted by the involvement of a heterogeneous mantle reservoir to different degrees of partial melting. The REE data require residual spinel stability peridotite field in the source and constrain the melting process of Group-C and Group-D to 2% to 3.5% degrees of melting respectively, Group-A and Group-B both to 5% degree of partial melting while Group-E to 10% degree of partial melting of spinel lherzolite xenoliths of Al Ourban area. Mass balance modelling of the major suggests two possible FC scenarios; Derivation of basanites and hawaiites of group-A from G-3 picritic parental magma. Derivation of Group-D and Group-E was also possible from these basanites. Derivation of basanites of Group-B from Z-3 picrite parental magma and simultaneous derivation of G-4 and QJ-1 alkali basalts from Z-3 picrite parental magma. V Simple mass-balance calculations suggest that the melting assemblages of picrites and basanites consisted of forsteritic olivine, diopsidic clinopyroxene, Ti-magnetite. While the alkali basalts and more differentiated magmatic rocks, mass-balance calculations suggest that the melting assemblages consisted of sodic plagioclase, magnesiotaramitic amphibole, diopsidic pyroxene, Ti-magnetite, K-feldspar with sub amounts of apatite and sphene.
سمية عون (2015)
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