Browsing Institutt for geovitenskap og petroleum by Title
Now showing items 1680-1699 of 2652
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On occurrence of point singularities in orthorhombic media
(Journal article; Peer reviewed, 2019)Degeneracies of the slowness surfaces of shear (and compressional) waves in low‐symmetry anisotropic media (such as orthorhombic), known as point singularities, pose difficulties during modelling and inversion, but can be ... -
On Processing and Inversion of Marine Magnetotelluric Data
(Doctoral theses at NTNU;2017:311, Doctoral thesis, 2017) -
On Regional Distribution and Characterization of The Klippfisk Formation Limestone
(Master thesis, 2016)This study documents and discusses the detailed sedimentology of the Berriasian to Early Barremian Klippfisk Formation on the western Barents Sea, at Bjarmeland Platform, northern part of the Bjørnøya Basin, northeastern ... -
On technologies for shale barrier evaluation in the North Sea
(Chapter, 2018)Cement evaluation tools have been used in the oil industry for decades to examine the integrity of cement bonding to the well casing and openhole. It has been suggested that such tools also can be used to verify the presence ... -
On the Accuracy of Mapping the Lateral Extent of Hydrocarbon Reservoirs in Marine CSEM
(Master thesis, 2016)In marine CSEM it is known that the real areal extent of a hydrocarbon reservoir will not necessarily be mapped correctly during inversion. Generally, the inversion will cause the reservoir to be undersized, as a result ... -
On the biogenicity of Fe-oxyhydroxide filaments in silicified low-temperature hydrothermal deposits: Implications for the identification of Fe-oxidizing bacteria in the rock record
(Journal article; Peer reviewed, 2019)Microaerophilic Fe(II)‐oxidizing bacteria produce biomineralized twisted and branched stalks, which are promising biosignatures of microbial Fe oxidation in ancient jaspers and iron formations. Extracellular Fe stalks ... -
On the Effect of CO2 on Seismic and Ultrasonic Properties: A Novel Shale Experiment
(Peer reviewed; Journal article, 2021)Carbon capture and storage (CCS) by geological sequestration comprises a permeable formation (reservoir) for CO2 storage topped by an impermeable formation (caprock). Time-lapse (4D) seismic is used to map CO2 movement in ... -
On the Importance of Expert Knowledge in Well Placement Optimisation
(Master thesis, 2016)As of today, well placement optimisation in field development planning is most commonly based on the trial-and-error approach that requires the evaluation of numerous field development scenarios. This approach is not ... -
On the Stability of Oil-Based Drilling Fluid: Effect of Oil-Water Ratio
(Chapter, 2020)Drilling fluids are complex mixtures of natural and synthetic chemical compounds used to cool and lubricate the drill bit, clean the wellbore, carry drilled cuttings to the surface, control formation pressure, and improve ... -
A one-step Bayesian inversion framework for 3D reservoir characterization based on a Gaussian mixture model-A Norwegian Sea demonstration
(Peer reviewed; Journal article, 2021)We have developed a one-step approach for Bayesian prediction and uncertainty quantification of lithology/fluid classes, petrophysical properties, and elastic attributes conditional on prestack 3D seismic amplitude-varia ... -
One-way wave-equation migration for wide-angle propagation in anisotropic media
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:140, Doctoral thesis, 2010)Seismic depth migration is a major component in the search for hydrocarbons. As new prospects for oil and gas often are found in areas with challenging subsurface structures, more advanced methods to find and evaluate these ... -
Online remote-controlled and cost-effective fouling and clogging surveillance of a groundwater heat pump system
(Peer reviewed; Journal article, 2021)Fouling and clogging of groundwater wells and heat exchangers are among the major operational challenges for groundwater heat pump (GWHP) and aquifer thermal energy storage (ATES) systems. This article presents the application ... -
Onshore to offshore correlation of ore-forming hydrothermal systems: Geological investigations of the Reinfjord Ultramafic Complex and Southwestern Barents Sea
(Doctoral theses at NTNU;2023:76, Doctoral thesis, 2023)Demand for mineral resources continues to grow, while political pressure, legitimate environmental concerns, and important ethical questions slow the development of new mineral resources. Simultaneously, emerging technologies ... -
Operation of Norwegian Hydropower Plants and Its Effect on Block Fall Events in Unlined Pressure Tunnels and Shafts
(Peer reviewed; Journal article, 2021)The main objective of this study is to investigate the effect of hydropower plant operation on the long-term stability of unlined pressure tunnels of hydropower plants in Norway. The authors analyzed the past production ... -
Operational Aspects of Sand Control
(Master thesis, 2010)Historically, means of sand control have been utilized in hydrocarbon recovery since before 1930. Guide lines for establishing a successful design and installation have been developing as a function of experience and better ... -
Operational Procedure for permanent P&A of Subsea Wells
(Master thesis, 2015)All oil-and gas wells ever drilled on the Norwegian continental Shelf will be abandoned at some point. The operating companies are entitled ensure no leaking to the surface from the reservoir in an eternal perspective ... -
Optimal Drilling and Completion of Deep ERD Wells
(Master thesis, 2013)In this Master Thesis well design for deepwater ERD wells have been reviewed. These wells present new challenges for the industry, which creates high demands for well design and materials. The constant push for deeper ... -
Optimal preventive policies for parallel systems using Markov decision process: application to an offshore power plant
(Journal article; Peer reviewed, 2023)This work proposes a Markov Decision Process (MDP) model for identifying windows of opportunities to perform preventive maintenance for multi-unit parallel systems subject to a varying demand. The main contribution lies ... -
Optimal time decay of the Boltzmann equation with frictional force
(Journal article; Peer reviewed, 2011)In this paper, we use the combination of energy method and Fourier analysis to obtain the optimal time decay of the Boltzmann equation with frictional force towards equilibrium. Precisely speaking, we decompose the equation ... -
Optimal utilisation of unbound crushed aggregates for road construction
(Doctoral thesis, 2020)Aggregates are construction materials produced from non-renewable rock resources. Because high-quality aggregate resources have limited availability, utilisation of aggregates should be considered carefully to prevent ...