كلية النفط والمعادن
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Item Petrophysical Evaluation For Abu Gabra Formation-Muglad Basin, Neem K Area (Block 4) Using Wells Data(Al-Neelain University, 2019) Altayeb GassemAlbari Altayeb IbrahimThis study Petrophysical Evaluation for Abu Gabra formation – Muglad basin, Neem k subfield (Block 4) four wells data by using Interactive petrophysics IP. Interpretation of Shaly sand oil reservoirs are still evolving with researchers to conduct a large number of studies to verify the effect of clay minerals on the conductivity of the reservoir through theoretical and experimental methods. In this study have been petrophysical evaluated to Shaly sand reservoirs in the Neem k subfield by selecting one formation to know of the petrophysical properties of the reservoir, it is formation of Abu Gabra. Determination layers of clay and layers of sand in the well logs was done by using interpretation of gamma-ray records, records the electrical resistivity, density recordings, and Neutron recordings, the result obtained in this study were evaluated by three major factors are: porosity, the volume of clay in layers and water saturation of layers, experimental results show clear contrast in the Average porosity, Average volume of clay and Average water saturation, was very compatible with characteristics of the reservoir. هذه الدراسه تمثل تقييم بتروفيزيائي لمتكون ابوجابره – حوض المجلد حقل نيم ك(مربع4)لاربعه ابار باستخدام برنامج انتراكتيف بتروفيزيك. تفسير خزانات الرمل الطيني النفطيه لازالت تتطور مع اجراء الباحثين لعدد كبير من الدراسات للتحقق من تاثير المعادن الطينيه علي الموصليه الكهربيه للخزان من خلال الطرق النظريه والتجريبيه ،في هذه الدراسه تم تقييم بتروفيزيائي لخزانات الرمل الطيني في حقل نيم ك وذلك بتحديد متكون واحد لمعرفة الخصائص البتروفيزيائيه وهو متكون ابوجابره،تم تحديد الطبقات الطينيه والطبقات الرمليه بواسطة تفسير تسجيلات اشعة جاما ، تسجيلات المقاومه الكهربيه، وتسجيلات الكثافه ، وتسجيلات النيترون ، النتائج المتحصل عليها تم تقييمها عن طريق ثلاث عوامل هي المساميه، حجم الطين في الطبقات ونسبة التشبع بالماء وقد اظهرت النتائج تفارق واضح في متوسط نسبة المساميه ، ومتوسط حجم الطين في الطبقات ، ومتوسط نسبة التشبع بالماء وقد كانت متوافقه جدا مع خصائص الخزان.Item Hydro-geophysical Investigations of the . Upper Aquifer Abyei area, South Kordofan State, Sudan(Al Neelain University, 2008-03) Khalid Musa Mohamoud AliThe Geological and Geophysical Electrical method in combination with Hydrogeological methods were applied to study the availability and potentialities of the groundwater resources and quality in the upper part of Um Ruwaba Fonnation in Abyei Locality- South Western Sudan. The geological succession in the study area consists of Basement complex overlain by Nubian Cretaceous Sandstone Formation, Um Ruwaba Fonnation, and Superficial deposits. Baggara basin composed of Nubian sandstone formation overlain by Um Ruwaba series considered as main aquifers in the study area. Umm Ruwaba Series is composed of a variety of sediments, coarse and fne, well sorted and poorly sorted, penneable and impenneable. The depth to water table for upper aquifer varies from 09 m to 45 m. and from 36 m to 127m for the lower aquifer; the transmissivity generally varies between 6.42 X l0'3 m2/s and 3.39 X l0'3 ml/sj the average Hydraulic conductivity lies between 3.4 X l0'4 m/s and 9.61 X l0'4 m/s and the average porosity between 28% and 39%. ' The hydraulic gradient in this particular part is ranging from 0.002 to 0.003. The low hydraulic gradient indicates relative homogeneity and isotropy of good porosity and permeability of the aquifer. The close spacing of the groundwater flow contours in the northeast, west and east of the study area indicates relative anisotropic aquifer. The Wide spacing contours at the middle part of the northeast side are particularly due to the thick saturated sedimentary section and the high transmissivity of Um Ruwaba fonnation. The final directional component merge to the SW of the study area, the resultant flow moves out of the study area in the direction to the Bahr El Arab. The surface and near surface layer reflect wide range of resistivity values from 6 to 200 Qm. A few anomalous values are shown to fall between 540- 2240 Qm (VES 17, 18 &l9). The lower range generally describes clays & sandy clay sediments. This unit extends to an average depth of 40 m. The second unit in the column is indicated by a range of 18 — 280 Qm, high resistivity values observed on the top of the layer especially under VES (8), (9), (10) and (11) with the resistivity values 546, 688, 898 and 468 Qm respectively reflecting dry gravelly and/or coarse sandy formation. The lower resistivity values zones in the second unit is interpreted as Water bearing horizon as it lies generally below the static water level in the region. The aquifer also shows low resistivity values at the bottom of VES (5), which probably refer to sandy clay fonnation. The water bearing horizon shows depth of 30-140 m below ground surface. The third layer is characterized by consistent resistivity values ranging between 5- 20 Qm this unit is most probably clays, which dominates underneath. This unit is known here as the upper clays of the Baggara basin. The chemical composition of water indicates Na-Ca-Mg-HCO3 water type which is suitable for drinking, irrigation and industrial purposes.Item Integration of Vibrosies & Dynamite Sources to Produce 3D Seismic Data for MirMir Area Block 5A Republic of South Sudan (RoSS)(2013) Samir Abdalla BadorAbstract: The importance of the seismic surveys as one of the geophysical exploration tool for oil and gas it is well known especially 3D surveys, despite is high cost. This Study has been conducted from MirMir area which is located in Block 5A (As per Su- dan oil concession map) in the Republic of South Sudan (RoSS). Variability in environment and terrains results in using different type of sources which is produces different seismic features not representing the real information from the subsurface, as always it must be there is only one changeable factor indicating the subsurface geology. The main objective of this study is to generate 3D seismic data for MirMir area from two types of energy source and to compare between the dynamite and Vibroseis as seismic sources. These objectives have been achieved by using methodologies to unify the acquired and processed data to correct for that idle case. As a result of this work this field is a produc- ing field now.Item A Field Parameter Test for the Design of Seismic Survey in Highly Faulted Subsurface area Muglad Basin(Al-Neelain University, 2014) Hussein Ali Ahmed EdrisABSTRACT Although high resolution seismic survey techniques are powerful tools for imaging subsurface complex geological structures, but the expensive field efforts often limit their applications in commercial exploration projects. It will be shown that initial survey design based on target horizons requirements, the result of pilot test of 2D seismic records, and generation of vertical mini stack sections , these have the potential to increase significantly the resolution of the acquired data, with less costs. A complex geological and geophysical model extracted from existing data is used to calculate the imaging requirements of several sub surface layers. Fifteen energy source patterns, two receiver array patterns and three different spread geometries with three vertical mini stack sections were tested in Nuggara Oil field, Muglad basin, to determine the optimal choice of receiving and shooting parameters. By adopting a certain quantitative and qualitative analysis, it is found that registered reflection events contain high resolution when shorter spreads with smaller bin size are used with less explosive charge size than in expected acquisition parameters.Item APPLICATION OF REMOTE SENSING (RS) AND GEOGRAPHIC INFORMATIAON SYSTEM (GIS) WITH GEOPHYSICAL RESISTIVITY FOR GROUNDWATER INVESTIGATIONS IN WEST ATBARA BASIN, RIVER NILE STATE, SUDAN(Al-Neelain University, 2014) EKHLAS HAROON AHMED IBRAHEEMABSTRACT The study area lies in the River Nile State in the North Central of Sudan. The geological settings of the study area are composed of Pre-Cambrian Basement Complex, upper Cretaceous Nubian sandstone formation, Oligocene Hudi Chert, and Quaternary superficial deposits in ascending order. Remotely sensed data of the Landsat 7 ETM+ multi-spectral images and SRTM (Shuttle Radar Topographic Mission) interferometry elevation data have been used in this study. Different digital image processing techniques were applied to the satellite images to reveal the geological and hydrological aspects. However, the Sands, Sand Stones shows the reddish to dark red tones when the alluvial Wadi deposits display light green to cyanic tone in colour composite images by using of bands 7,4 & 1 in RGB respectively. The Geophysical method were used in this study is electrical resistivity Vertical Electrical Sounding (VES), in this case Schlumberger electrode array was applied. Thirty four VES has been conducted in study area; computer software technique (IXID) has been used in interpretation of these soundings. The interpretation showed that; the area consist of three main aquifer types: the Nubian Sandstone aquifer is the best one, the alluvial deposits (of minor importance) and the weathered Basement Complex aquifer (of minor importance). II المستخلص تقع منطقة الدراسة بوالية نهر النيل - شمال السودان. تتمثل جيولوجية المنطقة فى صخور معقد االساس )Complex Basement )والتي يعود عمرها الي حقب ما قبل الكامبري، صخور العحجر الرملى النوبي، صخور الصوان المنتسبة لمنطقة الهودي )chert Hudi )والصخور الحديثة المتموضعة فى العصر الرباعي. تمت دراســة المنطقة بصــور األقمار الصناعية عن طريق دراســة صور المســبار الفضائي الندســــات 7+) ETM 7 Landsat (كصور متعددة األطياف والمــــعطيات الرقمية الحديثة لإلرتفاعات من معطيات المــكوك الفــــضائي الرادرارية Topography Radar Shuttle( .(Data Mission حيث، إستخدمت عدة تقنيات لمعالجة الصور الفضائية الرقمية إلظهار المظاهر الجيولوجية، الهايدرولوجية. أوضحت دراسة وتحليل صور األقمار الصناعية الملونة أن منطقة الدراسة تغطى بالرسوبيات الحديثة والمكونة من سحن الرمل، الغرين والطفل. تظهر الرسوبيات الناتجة عن تعرية الصخور الرسوبية في الصور الملونة للحزم الطيفية 7 ،4 و1 . بألوان محمرة داكنة بعض الشيئ بينما تظهر رسوبيات األودية باأللوان المخضرة والزرقاء الفاتحة. أستخدمت فى هذه الدراسة طريقة المقاومة النوعية الكهربائية بتطبيق السبر الكهربى الرأسى بإستخدام منظومة شلمبرجير لترتيب االلكترودات. تم قياس 44 نقطة سبر كهربائى رأسى، بينما استخدم البرنامج الحاسوبى )IXID )لتفسير المعلومات المأخوذة من مسارات السبر الكهربائى. حيث أثبتت تلك الدراسات أن هناك ثالث أنواع من الخزانات، هي خزانات الحجر الرملي النوبي، والخزانات الضحلة التي توجد فى الرسوبيات الحديثة وخزانات الصخور المفتتة من صخور االساس وكسورها.