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Search Results: 1 - 10 of 401409 matches for " Abdulaziz M. Abdulaziz "
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Microseismic Imaging of Hydraulically Induced-Fractures in Gas Reservoirs: A Case Study in Barnett Shale Gas Reservoir, Texas, USA  [PDF]
Abdulaziz M. Abdulaziz
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.35041
Abstract:

Microseismic technology has been proven to be a practical approach for in-situ monitoring of fracture growth during hydraulic fracture stimulations. Microseismic monitoring has rapidly evolved in acquisition methodology, data processing, and in this paper, we evaluate the progression of this technology with emphasis on their applications in Barnett shale gas reservoir. Microseismic data analysis indicates a direct proportion between microseismic moment magnitude and depth, yet no relation between microseismic activity and either injection rate or injection volume has been observed. However, large microseismic magnitudes have been recorded where hydraulic fracturing stimulation approaches a fault and therefore the geologic framework should be integrated in such programs. In addition, the geometry of fracture growth resulted by proppant interactions with naturally fractured formations follows unpredictable fashion due to redirecting the injection fluids along flow paths associated with the pre-existing fault network in the reservoir. While microseismic imaging is incredibly useful in revealing the fracture geometry and the way the fracture evolves, recently several concerns have been raised regarding the capability of microseismic data to provide the fracture dimensional parameters and the fracture mechanism that could provide detailed information for reservoir characterization.

Evaluation of Microseismicity Related to Hydraulic Fracking Operations of Petroleum Reservoirs and Its Possible Environmental Repercussions  [PDF]
Abdulaziz M. Abdulaziz
Open Journal of Earthquake Research (OJER) , 2014, DOI: 10.4236/ojer.2014.32006
Abstract:

Petroleum reservoir operations such as oil and gas production, hydraulic fracturing, and water injection induce considerable stress changes that at some point result in rock failure and emanation of seismic energy. Such seismic energy could be large enough to be felt in the neighborhood of the oil fields, therefore many issues are recently raised regarding its environmental impact. In this research we analyze the magnitudes of microseismicity induced by stimulation of unconventional reservoirs at various basins in the United States and Canada that monitored the microseismicity induced by hydraulic fracturing operations. In addition, the relationship between microseismic magnitude and both depth and injection parameters is examined to delineate the possible framework that controls the system. Generally, microseismicity of typical hydraulic fracturing and injection operations is relatively similar in the majority of basins under investigation and the overall associating seismic energy is not strong enough to be the important factor to jeopardize near surface groundwater resources. Furthermore, these events are less energetic compared to the moderately active tectonic zones through the world and usually do not extend over a long period at considerably deep parts. However, the huge volume of the treatment fluids and improper casing cementing operation seem to be primary sources for contaminating near surface water resources.

Aquifer Characterization and Groundwater Potential Using Integrated Geoelectric Sounding and Geoinformatics in West Maghagha Area, Minia Governorate, Egypt  [PDF]
Abdulaziz M. Abdulaziz, Abdalla M. Faid
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.711109
Abstract: The study area is located in the western extension of the Nile Valley near the boundary with the Western Desert, where the groundwater represents the potential water resource for future land development for both industrial purposes and agricultural reclamation. Historically, geoelectric methods proved prospective and practical in exploring for groundwater resources. In this study, 17 Vertical Electric Sounding (VES) were acquired and processed to reveal the subsurface distribution of the water bearing layers and identify the groundwater potential in West Maghagha area. After routine data analysis and calibration, the preliminary results are interpreted in light of the available geological data and indicated the presence of at least four geoelectric layers with model resistivity values up to 2000 Ωm. The potential aquifer was encountered down to ~120 m depth with average thickness of 100 m and is made of argillaceous fractured carbonates. Despite the overall poor quality of this aquifer, the integrated geoelectric and hydrogeologic information indicated a possible potential occurrence of potable groundwater at the southern and northeastern parts of the study area. To improve understanding of the groundwater systems in the study area, detailed aquifer characterization is discussed through integration of the available geologic data, maps, and the geoelectric sections constructed from the VES.
Subsurface Characterization for Groundwater Management nearby the Unfinished Obelisk Archeological Site, Aswan Governorate, Egypt  [PDF]
Abdulaziz M. Abdulaziz
Open Journal of Geology (OJG) , 2019, DOI: 10.4236/ojg.2019.911094
Abstract: Recently, the area located within the Unfinished Obelisk (UO) archeological site showed numerous seepages and accumulations of groundwater in a small pond located a few meters from the Unfinished Obelisk. The Supreme Council of Antiques sponsored integrated geological, geophysical, and hydrogeological studies to identify the possible sources of groundwater and the optimum technique to manage the groundwater flow system that may jeopardize this invaluable sculpture. The geological units and the prevailing structure have been studied in detail using Landsat imagery and field work over two consecutive seasons. The field studies indicated the development of several fault/joint systems oriented mainly ENE-WSW with clear indications of mineralization and intensive weathering effects along these fabrics. Several resistivity (vertical seismic profile and resistivity imaging) measurements extending down to at least 20 m depth and Radar imaging down to 10 m depth are gathered to investigate the extension of outcrop units and the dominant structures prevailing the near subsurface. Geophysical data indicated the development of at least three hydrostratigraphic units arranged from top to bottom as valley fill, fractured/weathered granite, and slightly fractured to massive granitic unit. In addition, the major faults mapped by resistivity images helped to locate several observation wells and a production well to test the transmissivity across the groundwater system. The results of a pumping test indicated very low aquifer conductivity and the development of an aquitard with preferential vertical flow at the study area. This enforces a local interference through a shallow underground drainage system with sump and pump to maintain low groundwater level at the UO-archeological site.
Well Log Petrophysics of the Cretaceous Pay Zones in Zubair Field, Basrah, South Iraq  [PDF]
Abdulaziz M. Abdulaziz, Abdel Sattar A. Dahab, Mohammed Y. Najmuddin
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.710104
Abstract: Discovered in 1949 with a rate of (195,000) bbl/day from pay zones in Mishrif and Zubair Formation, the expected production of Zubair field is anticipated to be 1125 million bbl/day. Despite this production history, there is a major deficiency in detailed petrophysical analysis of the producing zones. In the present study well log data of 7 wells, selected from numerous wells, are investigated in details to examine the reservoir properties and characterize the reservoir architecture. The petrophysical analysis of Mishrif Formation indicated two or three pay zones. Lithologically, all zones of Mishrif Formation are dominantly clean limestone to dolomitic limestone with zone 2 and 3 reporting higher dolomitic content (20% to 40%) compared to zone 1 (6% to 13%). Mishrif pay zones indicated a relatively good porosity (18% - 24%) with zone 2 predominant in secondary porosity associating dolomitization processes. In Zubair Formation one pay zone is identified but locally could separate into two zones. The clay content is generally low with average content between 2% and 3% while the average porosity showed slightly better values in zone 1 (~0.20) compared to average porosity of zone 2 (0.17) that is rich in silt content associating deposition at a relatively deeper parts of the shelf. The average water saturation shows distinct lower values that vary between 15% and 18.7%. The petrophysical results are statistically analyzed and property histograms and crossplots are constructed to investigate mutual relationships. Such analysis is essential for understanding the reservoir architecture and calculations of reservoir capacity for future development.
Petrophysical Analysis and Flow Units Characterization for Abu Madi Pay Zones in the Nile Delta Reservoirs  [PDF]
Abdulaziz M. Abdulaziz, Mohamed A. Abouzaid, A. S. Dahab
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.812070
Abstract: Field development typically requires detailed petrophysical analysis and well defined hydraulic flow units for comprehensive formation evaluation and reservoir characterization. In the present study, pay zones petrophysics are studied using an assembly of well log data from 8 wells together with core plugs measurements. Petrophysical analysis showed a good reservoir quality with average water saturation increasing toward the East and Southeast of the study area. Using a multi-linear regression technique on well logs and core data, permeability is estimated at well locations for flow unit characterization and flow capacity calculation. Results showed that five hydraulic flow units are identified through the studied wells, with relatively good correlation. Such correlation indicated a good continuity in the net pay zone of Abu Madi Formation in the Nile Delta reservoirs. The developed hydraulic flow units (HFUs) are classified according to its hydraulic conductivity into two main categories: the first category comprises the units with low permeability (K < 220 mD), and the second category involves the units with high permeability (K > 1270 mD). The reservoir flow capacity (RFC) of these units indicated the development of 4 distinct classes (~11, ~30, ~80, and greater than 130 D.ft). The wells within the Northwestern part of the study area showed three HFUs that relatively vary from those located at the Southeast where two HFUs are only developed. In addition, the Southeastern part of the reservoir is characterized by good RFC as indicated by the development of high order HFUs (3, 4, and 5) compared to the Northeastern part with predominated low order HFUs (1, 2, and 3). Such results are crucial for the efficient field development and profound reservoir management of oil and gas fields in the Nile Delta.
Efectos de los factores de edificabilidad sobre la productividad laboral de moldajes de vigas en fundaciones
Jarkas,Abdulaziz M;
Revista ingeniería de construcción , 2010, DOI: 10.4067/S0718-50732010000200004
Abstract: buildability is one of the most important factors affecting labor productivity. nonetheless, an extensive search of the literature revealed a dearth of research into its effects on in situ reinforced concrete construction, especially at the formwork trade level. despite the importance of this trade to in situ reinforced concrete material, the influence of buildability factors on formwork labor productivity of major structural elements are yet to be quantified in measurable terms. grade beams are important structural elements which are primarily used to provide one, or a combination, of the following functions: (1) tie the building foundations to provide the required lateral stiffness at the sub-structural levels; (2) reduce the unsupported free length of columns below grade level; and (3) limit excessive differential settlements of isolated foundations. therefore, the objective of this research is to investigate and quantify the effects and relative influence of the following buildability factors on formwork labor efficiency of this activity: (a) variability of beam sizes; (b) beam sizes; and (c) number of joints formed at beams intersections. to achieve this objective, a large volume of productivity data was collected and analyzed using the multiple regression method. as a result, the effects and relative influence of the buildability factors investigated are determined. apart from the variability of beam sizes, the findings show significant effects of these factors on formwork labor productivity, which can be used to provide designers feedback on how well their designs consider the requirements of buildability principles, and the consequences of their decisions on labor efficiency. on the other hand, the depicted patterns may provide guidance to construction managers for effective activity planning and efficient labor utilization.
Efectos de los factores de edificabilidad sobre la productividad laboral de moldajes de vigas en fundaciones The effects of buildability factors on formwork labor productivity of grade beams
Abdulaziz M Jarkas
Revista ingeniería de construcción , 2010,
Abstract: La edificabilidad es uno de los factores principales que afecta la productividad laboral. Sin embargo, una extensa revisión de la literatura reveló la ausencia de investigación sobre sus efectos en obras de construcción de concreto reforzado, especialmente a nivel del oficio del trabajo de moldeado. A pesar de la importancia de este oficio para el concreto reforzado en obras, la influencia de los factores de edificabilidad sobre la productividad del oficio del moldeado sobre elementos estructurales mayores, aún está por ser cuantificada en términos medibles. Las vigas en fundaciones son elementos estructurales importantes, usados para proporcionar una, o una combinación de las siguientes funciones: (1) amarrar los cimientos de la edificación y proporcionar la rigidez lateral en los niveles sub-estructurales; (2) reducir la longitud libre de las columnas sin soporte, bajo el nivel de la rasante; (3) limitar el excesivo diferencial de asentamientos en los cimientos aislados. Por lo tanto, el objetivo de esta investigación es analizar y cuantificar los efectos e influencia relativa de los siguientes factores de edificabilidad, sobre la eficiencia del trabajo de moldeado de esta actividad: (a) la variabilidad del tama o de las vigas, (b) tama o de las vigas, (c) cantidad de juntas resultantes de las intersecciones de las vigas. Con el fin de lograr este objetivo, un gran volumen de datos sobre la productividad ha sido recopilado usando un método de regresión múltiple. Como resultado, se determinaron los efectos e influencia relativa de los factores de edificabilidad investigados. A parte de la variabilidad de tama o de las vigas, los descubrimientos indican significativos efectos de estos factores sobre la productividad del trabajo de moldeado, la que puede ser empleada para entregar un comentario a los dise adores sobre cuan bien sus dise os consideran las necesidades de los principios de edificabilidad, y las consecuencias de sus decisiones sobre la eficiencia laboral. Por otro lado, los patrones descritos pueden servir como guía a los administradores de la construcción para una efectiva planificación de actividades y utilización laboral eficiente. Buildability is one of the most important factors affecting labor productivity. Nonetheless, an extensive search of the literature revealed a dearth of research into its effects on in situ reinforced concrete construction, especially at the formwork trade level. Despite the importance of this trade to in situ reinforced concrete material, the influence of buildability factors on formwork labor productivity of ma
A novel approach to manage patients with compromised airway. Videoscopic assisted retromolar intubation
Abdulaziz M. Boker
Saudi Medical Journal , 2013,
Abstract: Aids to difficult airway management are essential for safe practice of anesthesia particularly for high-risk patients. This case series described a novel approach of combined use of complementing tools (videolaryngeoscopic assisted retromolar intubation) to enhance airway management of a subset of various high-risk patients with extremely difficult airway. It also addressed the rational for the combination of such approaches as well as the advantages and disadvantages of this technique. In all of the 4 patients, the use of the combined approach resulted in a successful intubation without the need for surgical airway. This technique showed many advantages making it possible to use in cases with life threatening airway obstruction.
The Effects of Buildability Factors on Rebar Fixing Labour Productivity of Beamless Slabs
Abdulaziz M Jarkas
Australasian Journal of Construction Economics and Building , 2010,
Abstract: Buildability is an important factor affecting labour productivity. Nevertheless, a thorough search of the literature revealed a dearth of research into its effects on in situ reinforced concrete construction, especially at the activity levels. Since rebar fixing is an integral trade of this type of construction material, and beamless slabs are amongst the major encountered activities on construction sites, the objective of this research is to explore the buildability factors affecting its rebar fixing efficiency. To achieve this objective, a large volume of fixing productivity data was collected and analysed using the categorical interaction - regression method. As a result, the main and interaction effects of rebar diameter; reinforcement quantity; slab geometry; and reinforcement layer location are determined. The findings show a significant influence of these factors on the fixing operation, which can be used to provide designers and construction managers with feedback on how well the design of this activity considers the requirements of buildability, and the tangible consequences of designers decisions on labour productivity
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