Blar i Department of Earth Science på dokumenttype "Doctoral thesis"
Viser treff 1-20 av 111
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3D seismic stratigraphy and reservoir characterization of the Chalk Group in the Norwegian Central Graben, North Sea
(Doctoral thesis, 2011-12-08) -
3D stochastic modelling of fault zones in siliciclastic reservoirs. Implications for reservoir description and fluid flow modelling
(Doctoral thesis, 2014-12-16)Fault zones in siliciclastic rocks form distinct volumetric entities and typically exhibit great structural complexity. While it has been considered that the main impact of fault zones to fluid flow is to baffle or block ... -
Abrupt changes in sea ice and dynamics of Dansgaard-Oeschger events
(Doctoral thesis, 2017-12-01)Changes in sea ice are proposed as an important component in Dansgaard-Oeschger events; the abrupt climate change events that occurred repeatedly during the last ice age. Paleoclimatic reconstructions suggest an expansion ... -
Acoustic Propagation Underneath the Arctic Sea-ice
(Doctoral thesis, 2018-10-04)The main objective of this project is to study the effect of sea-ice on underwater acoustic wave propagation. Three main parameters define how acoustic waves react to the presence of seaice: (i) the roughness of the underside ... -
Adjoint Modeling and Observing System Design in the Subpolar North Atlantic
(Doctoral thesis, 2019-08-30)The near-surface ocean currents of the subpolar North Atlantic transport large amounts of heat from the subtropics to higher latitudes, affecting Arctic sea ice extent, the melting of the Greenland Ice Sheet, and the climate ... -
Ambient noise levels, QLg wave tomography and earthquake source parameters in Norway
(Doctoral thesis, 2019-04-05)Norway is part of an intraplate environment and therefore experiences low to intermediate seismicity. This seismicity is a response to the stress eld in the lithosphere, which is mainly in uenced by ridge push from the ... -
Analytical and numerical studies of fluid reservoirs and fracture development in heterogeneous rocks
(Doctoral thesis, 2009-06-29) -
Applied Structural Geology – Case Studies of Underground Constructions and Rockslides
(Doctoral thesis, 2008-02-26)An understanding of the structural elements in the sub-surface is of great importance when establishing new constructions in bedrock, or surveying areas prone to rockslides. In this thesis the focus has been on combining ... -
Calibration, validation and application of the foraminiferal Mg/Ca. Reconstructing the intermediate water masses structure and origin in the Western Tropical Atlantic
(Doctoral thesis, 2015-05-22)The Atlantic Meridional Overturning Circulation (AMOC) plays a central role in the northward distribution of heat. It is a key mechanism in the climatic system that needs to be further understood. Most studies focused on ... -
Clumped isotope thermometry as a new tool for reconstructing Miocene climate change
(Doctoral thesis, 2020-01-27)This PhD thesis focuses on the clumped isotope paleothermometer and its application to foraminiferal carbonates buried in ocean sediments. Based on new proxy evidence for ocean temperature, the thesis aims at improving our ... -
Clumped isotope thermometry in foraminifera - From calibration to Plio-Pleistocene temperature reconstructions in the Indo-Pacific Warm Pool
(Doctoral thesis, 2020-06-25)Clumped isotopes thermometry on foraminifera holds the potential to accurately reconstruct ocean temperatures on million-year timescales. In contrast to most other paleothermometers, clumped isotopes do not rely on prior ... -
Computationally Efficient Methods for Seismic Modeling and Inversion
(Doctoral thesis, 2020-11-18)This thesis presents new methods for the modeling of seismic waveforms based on ray theory and ray-Born integrals. The waveforms are used in forward modeling, imaging and full waveform inversion and are computed in 3D ... -
Continuous and episodic sedimentation in western Norwegian fjord lakes. A Holocene climatic perspective
(Doctoral thesis, 2011-10-21)A Holocene chronology of hazardous events has been constructed in parallel with a new record of glacier variability from inner Nordfjord in western Norway, based on the analysis of seismic profiles and sediment cores from ... -
Contractional deformation of porous sandstones. Laramide and Sevier deformation of the Navajo and Aztec sandstones in western USA
(Doctoral thesis, 2015-02-16)In response to stress, high porosity sandstones tend to deform and localize strain in the form of deformation bands, which form by rotation, sliding and potentially crushing of grains. Contrary to slip surfaces and fractures, ... -
Correlations between the effective permeability and seismic anisotropy of fractured reservoirs
(Doctoral thesis, 2011-08-23)The successful exploitation of many hydrocarbon reservoirs may depend on proper characterization of fractured or composite porous media. However, due to anisotropy and heterogeneity, the characterization of such kind of ... -
Coupled surface process and tectonic modelling of extension-inversion tectonics in the Pyrenees
(Doctoral thesis, 2014-09-26) -
Crustal structure across the western Barents Sea from deep seismic and potential field data. Implications for Caledonian trends and subsequent basin formation
(Doctoral thesis, 2018-05-24)The aim of this project is to map the deep crustal structure of the western Barents Sea in order to increase the understanding of how pre-existing structures related to the Caledonian orogeny and subsequent extensional ... -
Crustal structure and seismicity of Cuba and Web-based applications for earthquake analysis
(Doctoral thesis, 2002)This thesis comprises six papers divided into two parts. Part I consist of four papers in which a study of the crust and seismicity of Cuba is presented. The main achievements in this part are: (1) A new Pwave velocity ... -
Cryostratigraphy and sedimentology of high-Arctic fjord-valleys
(Doctoral thesis, 2018-01-17)Fjord-valleys, as sediment-filled palaeofjords, are characteristic of formerly glaciated mountainous coastal areas. High-Arctic fjord-valleys commonly host permafrost, but are poorly accessible and hence have drawn relatively ...