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Value-at-Risk Forecasts in GCC Stock Markets Under Oil Shocks
, M.Sc. Thesis Sharif University of Technology ; Zamani, Shiva (Supervisor)
Abstract
This thesis has two section. In the first section, this thesis studies the dynamic behavior of daily oil prices and finds strong evidence of GARCH as well as conditional jump behavior. This implies that conditional heter oscedasticity is present and the empirical distribution of oil price changes has heavy tails. Thus, the oil price consider ably sensitive to news and does not settle around along-run trend.In the second section This thesis investigates the out-of-sample value-at-risk (VaR) forecasts in gulf cooperation council stock markets by considering both oil volatilities and the developed GARCH model construction. The em-pirical results indicate that the Oil GARCH model with...
Assessment of Existing Jaket-Type Offshore Platforms in the Persian Gulf Region for Service Life Extension or Operative Conditions
, Ph.D. Dissertation Sharif University of Technology ; Golafshani, Ali Akbar (Supervisor)
Abstract
Assessment of existing jacket-type offshore platforms in Persian Gulf for life extension or operative conditions is a major concern for oil offshore companies in recent years. Significant damage to offshore platforms as well as their contents will induce significant losses such as financial losses, fatalities and casualties. On the other hand, extreme waves or earthquakes are low-probability, large-consequence and large-uncertainty hazards that can affect these critical facilities; therefore, the assessment of existing offshore platforms subjected to each of these sources can be successfully carried out by a probabilistic approach. In this dissertation, a unique probabilistic...
An Integrated GIS and Multi-criteria Decision-making Approach for Site Selection of Offshore Wind Farms (Case Study: The Persian Gulf and the Sea of Oman)
, M.Sc. Thesis Sharif University of Technology ; Abbaspour, Madjid (Supervisor) ; Mehdigholi, Hamid (Co-Supervisor)
Abstract
The use of clean energy sources has become increasingly popular around the world in recent years. One of the most important of these sources is wind energy. Due to the high wind potential in offshore areas than on land, this study uses the integration of multi-criteria decision-making methods and GIS to identify the best areas for developing offshore wind farms in the Persian Gulf and the Sea of Oman. Criteria applied in this study are divided into two categories: restrictive criteria, such as recommended transportation routes and anchored restricted areas, and technical criteria, such as wind speed and water depth. After removing the inappropriate areas using restrictive criteria, the...
Consequence Modelling and Probabilistic Risk Assessment of Oil Spills in the Marine Waters
, Ph.D. Dissertation Sharif University of Technology ; Raie, Mohammad (Supervisor)
Abstract
Different causes in the exploration, production and transport of oil in the marine environment result in oil spill events. Since elimination of the probability of occurrence of spills is not possible, it is important to have a plan to control the risk of oil spills by optimal response. In this research, a general stucture is presented for the DSS required for oil spill response planning. This system can be used for evaluation of the effectiveness of response drills, and risk-based ranking of receptor areas and spill sources. Ranking based on risk is realized through probabilistic or stochastic risk assessment. The applicability of the proposed system is examined in differnet case studies in...
Identification of Oil Spills in the Ocean using Remote Sensing and Near Real-Time Trajectory Case study: Persian Gulf
, M.Sc. Thesis Sharif University of Technology ; Raie, Mohammad (Supervisor)
Abstract
Knowing the location and time of oil accidents and trying to track the pollution caused by these accidents is very important for the purpose of monitoring and protecting the environment. The occurrence of large oil spills in the marine environment can have serious environmental, social and economic consequences. In this research, oil spills in the Persian Gulf were first identified using remote sensing method and Sentinel-1 satellite images. The images of this satellite were called for the processes needed to identify oil spills in Google Earth Engine space. After detecting the oil spills, it is necessary to determine the duplicate spills and remove these types of spills, as well as estimate...
Monitoring the Influence of Variations in Remotely-Sensed Values of Sea Surface Temperature Along with the El Niño Phenomenon on the Coral Reefs Bleaching, Case Study: Kish Island, Persian Gulf
, M.Sc. Thesis Sharif University of Technology ; Raie, Mohammad (Supervisor) ; Kabiri, Keivan (Co-Supervisor)
Abstract
Coral reefs are one of the most important ecosystems in terms of animal diversity and affect the life of organisms in different ways. This ecosystem is under many stresses today. Among the most important events that threaten corals is the event of coral bleaching, the most important cause of which is the increase in Sea Surface Temperature (SST). Therefore, it is highly important to monitor changes in SST affecting corals. Generally, temperature anomalies are investigated using the Degree Heating Weeks index (DHW) and SST data. DHW index is variable in different coral areas and changes with time. Consequently, in the present study, this index has been investigated due to the lack of...
Utilization of percolation approach to evaluate reservoir connectivity and effective permeability: A case study on North Pars gas field
, Article Scientia Iranica ; Vol. 18, issue. 6 , December , 2011 , p. 1391-1396 ; ISSN: 10263098 ; Masihi, M ; Pishvaie, M ; Shojaei, A ; King, P. R ; Sharif University of Technology
Abstract
Reservoir characterization, especially during early stages of reservoir life, is very uncertain, due to the scarcity of data. Reservoir connectivity and permeability evaluation is of great importance in reservoir characterization. The conventional approach to addressing this is computationally very expensive and time consuming. Therefore, there is a great incentive to produce much simpler alternative methods. In this paper, we use a statistical approach called the percolation theory, which considers a hypothesis wherein the reservoir can be split into either permeable (i.e. sand/fracture) or impermeable flow units (i.e. shale/matrix), and assumes that the connectivity of permeability...
Assessment of offshore structures under extreme wave conditions by Modified Endurance Wave Analysis
, Article Marine Structures ; Volume 39 , December , 2014 , Pages 50-69 ; ISSN: 09518339 ; Mohajernassab, S ; Seif, M. S ; Tabeshpour, M. R ; Mehdigholi, H ; Sharif University of Technology
Abstract
Recently, various approaches have been introduced to estimate the response of offshore structures in different sea states by stepwisely intensifying records. In this article, a more practical approach entitled Modified Endurance Wave Analysis (MEWA) considering the random and probabilistic nature of wave loading and utilizing optimal time duration is introduced. Generation procedure of this approach is described based on two practical wave theories: random and constrained new-wave. In addition, assessment of a simplified model representing a typical fixed offshore platform under extreme wave conditions in the Persian Gulf is performed making use of MEWA. A comparative analysis has been also...
Toe-to-heel air injection: Investigation of the effect of fractures geometrical properties on process performance
, Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Volume 33, Issue 22 , Sep , 2011 , Pages 2067-2077 ; 15567036 (ISSN) ; Kharrat, R ; Ghotbi, C ; Sharif University of Technology
Abstract
Toe to heel air injection has been studied on non-fractured sandstone models and is found to be a promising enhanced oil recovery method for certain heavy oil reservoirs, such as those in Canada, but its applicability on fractured reservoirs, such as those in the Middle East, is not investigated yet. The objective of this article is to evaluate the effect of fractures geometrical parameters, such as fracture density, orientation, and location, on the performance of the process in laboratory scale. Simulation results showed that toe-to-heel air injection is more applicable on highly networked fractured reservoirs, such as those that occur in Persian Gulf coast compared to lower density...
Utilization of percolation approach to evaluate reservoir connectivity and effective permeability: A case study on North Pars gas field
, Article Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1391-1396 ; 10263098 (ISSN) ; Masihi, M ; Pishvaie, M ; Shojaei, A ; King, P. R ; Sharif University of Technology
2011
Abstract
Reservoir characterization, especially during early stages of reservoir life, is very uncertain, due to the scarcity of data. Reservoir connectivity and permeability evaluation is of great importance in reservoir characterization. The conventional approach to addressing this is computationally very expensive and time consuming. Therefore, there is a great incentive to produce much simpler alternative methods. In this paper, we use a statistical approach called the percolation theory, which considers a hypothesis wherein the reservoir can be split into either permeable (i.e. sand/fracture) or impermeable flow units (i.e. shale/matrix), and assumes that the connectivity of permeability...
The effect of fractures' geometrical properties on the recovery mechanism of the top-down in situ combustion process
, Article Petroleum Science and Technology ; Volume 30, Issue 2 , Feb , 2011 , Pages 147-158 ; 10916466 (ISSN) ; Kharrat, R ; Sharif University of Technology
2011
Abstract
The top-down in situ combustion (ISC) involves the stable propagation of the combustion front from the top vertical injector to the bottom horizontal producer. Apart from laboratory studies in conventional sandstones, no application of the process in fractured carbonates has been addressed yet. The authors modified a successful combustion tube history matched model of an Iranian low-permeable heavy oil reservoir called Kuh-E-Mond to investigate the feasibility of ISC in fractured carbonate reservoirs mimicking block-scale combustion cells. Effects of fractured geometrical properties such as orientation, location, extension, density, spacing, and dispersion were considered. Results confirmed...
Preliminary considerations on the application of toe-to-heel steam flooding (THSF): Injection well-producer well configurations
, Article Chemical Engineering Research and Design ; Volume 89, Issue 11 , 2011 , Pages 2365-2379 ; 02638762 (ISSN) ; Yadali Jamaloei, B ; Sharif University of Technology
Abstract
This work examines the operational parameters that may influence the performance of toe-to-heel steamflooding in a laboratory-scale simulation model built on the basis of the fluid and rock samples from a fractured, low-permeable, carbonate heavy oil reservoir in Southwestern Iran, called KEM (Kuh-e-Mond). Using vertical (V) or horizontal (H) injectors (I) and producers (P), the effects of different well configurations including VIVP, VIHP, 2VIHP, VI2HP, HIHP, and HI2HP, injectors' traversal distance, producers' traversal distance, and horizontal producer length have been investigated. In summary, the results show that 2VIHP scheme performs best in terms of oil recovery and areal/volumetric...
Retrofit of Ressalat jacket platform (Persian Gulf) using friction damper device
, Article Journal of Zhejiang University: Science A ; Volume 12, Issue 9 , 2011 , Pages 680-691 ; 1673565X (ISSN) ; Tabeshpour, M. R ; Golafshani, A. A ; Mualla, I ; Sharif University of Technology
Abstract
A friction damper device (FDD) is used for vibration control of an existing steel jacket platform under seismic excitation. First, the damping is presented for vibration mitigation of structures located in seismically active zones. A new method for quick design of friction or yielding damping devices is presented. The effectiveness of the damping system employing such FDDs in a jacket platform is evaluated numerically. The influence of key parameters of the damping system on the vibration suppression of the offshore structure is studied in detail. To examine the vibration control effectiveness of the FDD for the jacket platform, performance of the controlled structure under the seismic...
The effect of temperature and impeller speed on mechanically Induced Gas Flotation (IGF) performance in separation of Oil from oilfield-produced water
, Article Petroleum Science and Technology ; Volume 28, Issue 14 , 2010 , Pages 1415-1426 ; 10916466 (ISSN) ; Borghei, S. M ; Nadim, F ; Roayaei, E ; Sharif University of Technology
2010
Abstract
The effect of temperature and impeller speed on the performance of induced gas flotation (IGF) systems for the removal of oil from produced water in different ranges (5-300 g/L) of total dissolved solids (TDS) was investigated in a pilot plant study. Furthermore, it was evaluated whether the IGF pilot plant effluent could reach the 15 mg/L outlet oil content as required by Article VI of the Kuwait Convention for Persian Gulf region, before being discharged to the sea. The results showed that oil removal efficiencies up to 90% could be reached at high temperature (80°C) in just one single flotation cell without adding any chemicals. Flotation unit, however, should be followed by at least one...
Inverse vibration technique for structural health monitoring of offshore jacket platforms
, Article Applied Ocean Research ; Volume 62 , 2017 , Pages 181-198 ; 01411187 (ISSN) ; Lotfi, A ; Dolatshahi, K. M ; Golafshani, A. A ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
In this paper a new approach is introduced for structural health monitoring of offshore jacket platforms. The procedure uses the measured ambient vibration responses and the corresponding readable natural frequencies and mode shapes of the structural system. Since offshore platforms are composed of heavy topsides supported by jacket structures, participation of the first mode is dominant in each direction in the response of the structure under field excitations. Moreover, ambient vibrations such as wave loads and boat impacts only excite the first modes of the structure. Therefore, it is difficult to find higher modes and the pertinent frequencies by use of accelerometers data. The...
An industrial application of low-grade sensible waste heat driven seawater desalination: a case study
, Article Desalination ; Volume 470 , 2019 ; 00119164 (ISSN) ; Marvi, Z ; Alamolhoda, A. A ; Abbaspour, M ; Chua, H. T ; Sharif University of Technology
Elsevier B.V
2019
Abstract
This paper reports on the application of low-grade sensible waste heat (liquid phase) driven multi-effect distillation (MED) technology to exploit waste heat sources that are generally abundant in the petrochemical industries especially, those located close to the Persian Gulf's coastline. For this purpose, a techno-economic feasibility study by considering local capital and operating costs for a selected petrochemical plant has been conducted. In this study, a sensible waste heat stream (practically at 80 °C in the liquid phase), which is actively cooled by the cooling process of the plant, is considered as the heat source for the proposed desalination process. This process can recover...
Effects of salinity, ion type, and aging time on the crude oil-brine interfacial properties under gravity condition
, Article Journal of Petroleum Science and Engineering ; Volume 195 , December , 2020 ; Akhlaghi Amiri, H. A ; Ayatollahi, S ; Sharif University of Technology
Elsevier B.V
2020
Abstract
In this study, the impacts of salinity, ion type, and aging process were investigated on coalescence and spreading of crude oil interfaces (including an oil droplet and an oil film) under gravity, through drop rest time measurement techniques, aided by an image analysis system. Three different salt solutions of NaCl, Na2SO4, and MgCl2 were studied at different ionic strengths, ranged from 1% to 150% of Persian Gulf seawater ionic strength. According to the results, aging the oil droplet in the brine increased the interfacial rigidity. Addition of a gas phase - by thinning the surface oil film - almost doubled both rest time and spreading time values. In the aged mode, the presence of salt in...
Correlation between concentrations of chlorophyll-a and satellite derived climatic factors in the Persian Gulf
, Article Marine Pollution Bulletin ; Volume 161, Part A , December , 2020 ; Moradi, N ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Monthly mean satellite derived Chl-a, aerosols, wind, SST, PAR, and turbidity datasets were used to investigate the possible factors regulating phytoplankton variability in the Persian Gulf. The spatial correlation analysis revealed two distinct regions of SST and PAR, and a relatively uniform spatial correlation pattern of the other parameters. The cross correlation between aeolian dusts and Chl-a was significantly positive with 1–3 months offset. The pattern of spatial correlation between Chl-a and SST was positive in the shallow regions without time lag, and was negative with time offset of 3–5 months in deeper regions. The cross correlation between Chl-a and north-ward winds were...
Ultimate strength analysis of jacket type offshore platforms due to wave, current and wind loading
, Article Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 15 June 2008 through 20 June 2008, Berlin ; Volume 1 , 2008 , Pages 779-786 ; 9780791848234 (ISBN) ; Aghakouchak, A. A ; Samadani, S ; Aghakouchak, A
2008
Abstract
As the result of safety factors considered in load and resistant values for the design of new offshore platforms, a higher resistance compared to the 100 year return period environmental loading, is achieved in the structure. This type of design is usually performed using linear methods of structural analysis. In this case the structure practically has a high reserve capacity which is disregarded in the design phase but may be considered in special cases. One of these important cases is when an existing structure is assessed and evaluated after elapse of its structural life. In this case using the platforms reserve capacity, through a non-linear analysis such as push-over, would be logical...
Water allocation for wetland environmental water requirements: The case of Shadegan wetland, Jarrahi catchment, Iran
, Article World Environmental and Water Resources Congress 2006: Examining the Confluence of Environmental and Water Concerns, Omaha, NE, 21 May 2006 through 25 May 2006 ; 2007 ; 0784408564 (ISBN); 9780784408568 (ISBN) ; Tajrishy, M ; Sharif University of Technology
2007
Abstract
The Shadegan Wetland is a Ramsar-listed wetland in the south-west of Iran at the head of the Persian Gulf. It is the largest wetland of Iran covering about 400,000 hectares. The wetland plays a significant hydrological and ecological role in the natural functioning of the northern Gulf. It also supports a very diverse flora and fauna and is the most important site in the world for Marbled Teal. The water regime is threatened by upstream abstraction of water for irrigation and the saline discharge from sugar cane industries and irrigation schemes. This will result in an overall reduction in wetland water quantity and quality, leading to a change in plant community composition. This paper...