Abstract The Nubian Sandstone of Lawer Cretaceous Formation is located in Sarir Oil Field, in the Southeastern Sirte Basin in Libya. After conductiog 300 point counts on 24 thin sections from C4 -65&C3 -65. The deposition environment and diagenesis that affected the variability of porosity and permeability within a given lithologic unit. I found the Nubian Sandstone bodies of Sarir-C-North can also be divided on the basis of grian size and sedimentary structure into type: - 1) medium to coarse- grained sandstone 2) very fine grains sandstone. Association in the former lithologic, the siltstone and silty sandstone are grey and usually laminated; while in the latter they form white-grey or reddish siltstone and shaly siltstone beds, commonly intensively burrowed, and locally contain fragments of coal. A different depositional environment deposited each lithology. The Nubian Sandstone is interpreted to include several lithofacies deposited in fluvial environment. It informal these facies controlled both the primary porosity and diagenetic events. Peterophysical properties of formation under study were determined using different well logs. Porosities are calculated using sonic, neutron, and density logs. It is clear that the primary porosity in (well C3 -65) of formation represents dominant one and the secondary is (well C4- 65) of rare.
ليلي المبروك (2008)

تعتبر التربة الطينية من انواع التربة الصعبة ذات المشاكل الهندسية نتيجة لظروف تكوينها والتأسيس عليها يكون صعباً بسبب حدوث الحركة النسبية في المنشأ نتيجة الانتفاخ او الهبوط.ويعتبرالطين من المكونات الرئيسية للسبخة ولهذا اجريت الدراسة الجيوتقنية لتربة السبخة بالمنطقة من سرت الى البريقة حيث تصل عدد العينات الى 300 عينة على طولالمنطقة . والدراسة الجيوتقنية مهمة عند اقامة مشاريع انشاء البنية التحتية مثل المنشآت ,والسكة الحديدية , والطرق , وانابيب الماء والغاز . وفي هذا البحث تم اجراء عدة تحاليل جيوتقنية لهذه التربة لما لديها من مشاكل ولانها من التربة الصعبة.وشملت الدراسة الحقلية التجارب اختبار الاختراق القياسي واختبار التحميل الموقعي واختبار مروحة القص . ومنها صنفت بانها مكونة من تربة رملية مختلطة بنسب متفاوتة من الطين والطمي والاختبارات المعملية مثل اختبارات اللدونة والتحليل المنخلي واختبار الضغط الغير محصور.ومن هذه اوضحت ان التربة منخفضة اللدونة ووجد ان تماسك التربة يزداد بزيادة عدد الطرقات في التربة ومنها يقل هبوط التربة . ونجد ان التربة الطينية متماسكة لان دليل اللدونة PI = 7 – 17 .لقد بينت نتائج المقارنة ان المناطق التي تحتاج لتحسين تميزت بكثافة نسبية ضعيفة ومقاومة قص منخفضة بالاضافة لقيم هبوط عالية آخداً في الاعتبار وجود المياه في السبخة .بينت علاقات المقارنة بين هبوط التربة في كل من الاختراق القياسي والتحميل الموقعي شكل (6.6) ان الهبوط في التربة السبخية في مواقع الدراسة يختلف من نقطة لاخرى ويتراوح من 20 الى 100 مم ومن هذا نجد ان التربة التي تحتاج لعمليات تحسين هي المواقع التي يتعدى الهبوط فيها 25 مم .وبينت العلاقة بين العمق والكثافة النسبية في شكل (7.6) ان الكثافة النسبية ضعيفة من عمق 0 الى 6 متر . Abstract The clay soil is considered one of the difficult types and have engineering problems due to its composition. The foundation upon the clay soil may face some troubles because of relative movement as a result of heave or settlement of the substrate .The clay is one of the main components of the sabkha, therefore the present study was carried out on the geotechnical properties of the sabkha soil along the area from Sirte to Brega. Up to three hundreds samples were taken from the studied area .The geotechnical study is very important for the construction of Infra structure projects , such as huge buildings , railway roads , asphaltic roads and pipes of water and gas. In this research, several geotechnical tests were undertaken for the sabkha soil, because of it is hard and have some problems.The field study included the standard penetration test, load testing and test site fan of the storytelling. According to the different tests, the soil was classified as composed of sandy soil mixed with varying conte- nts of clay and silt .The laboratory tests such as tests for plasticity, sieve analysis and unconfined compression test were performed. These showed that low soil plasticity and found that the cohesion of the soil increases with the number of blows in the soil, associated with settlement of the soil. We find that the clay soil is cohsion because it has coherent index plasticity PI = 7 - 17. The results of the comparison showed that the areas that need to improvement are characterized by relatively low density and low values of resistance to shear , in addition high values of settlement, with taking into consideration into account the presence of water in the sabkha. The relationships between the comparative settlement of soil in each of the standard penetration site and download the form fig. (6.6) that settlement of the sabkha soil in the studied sites varies from one point to another, ranging from 20 to 100 mm .Therefore we find that the soil which needs to improvement processes is located in the sites that have settlement which exceeds than 25 mm. The relationship between the depth and relative density fig. (7.6) showed that the relative density is weak from a depth of 0 to 6 meters.
سالمة ابراهيم محمد (2010)

Abstract Normally the study and investigated of earth material from the view of their uses as embankment and backfill material has a great importance in earth woks. This research concerns the assessment of earth masses and their properties which related embankment and backfill suitability as well as providing a mixing methods to upgrade the unsuitable within the accepted standards. The objectives of this research could be briefed by the investigation of earth masses along the study area which is governed by the distribution of superficial deposits comprehensive laboratory testing of soil samples molding Andes properties classification testing proctor and California bearing ratio recognition of suit able and non suit able backfill soil enhancement of unsuitable soil by mixing with other suitable soil such as quarry dust provided by nearby quarry correlation analysis and economic feasibility the study area is located in east of Tripoli from Tajoura to Misurata . This study manly concluded that as long as the poorly graded soil (A3) is difficult to be compacted according to the engineering properties of such soil are enhanced certainly by mixing with good sailable materials such as quarry dust. This research also conduced that the compaction properties will be enhanced by mixing where the optimum moister content is needed at the increase of maximum dry density. This research provides procedure of mixing design and recommendations for the mixing to achieve better results.
عبد السلام محمد بحرون (2011)