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4D Seismic History Matching Using the Ensemble Kalman Filter (EnKF): Possibilities and Challenges
(The University of Bergen, 20100527)This research endeavor presents a 4D seismic history matching work flow based on the ensemble Kalman filter (EnKF) methodology. The objective of this work is to investigate the sensitivity of different combinations ...Doctoral thesis 
Analysis of multibeam sonar echos of herring schools by means of simulation
(The University of Bergen, 20130531)The synchronized behavior of large schools of fish can be a fascinating sight and has caught the attention of researchers for decades. Schools of thousands, or even millions of fish can seemingly function as a single ...Doctoral thesis 
Analytical Methods for Upscaling of Fractured Geological Reservoirs
(The University of Bergen, 20151016)Numerical simulations have become an essential tool for planning well operations in the subsurface, whether the application is petroleum production, geothermal energy, groundwater utilization or waste disposal and leakage. ...Doctoral thesis 
An approximate hybrid method for modeling of electromagnetic scattering from an underground target
(The University of Bergen, 20101209)The detection of a potential petroleum reservoir is achieved through inversion of electromagnetic data acquired in sea floor receivers. Inversion of electromagnetic data requires a number of repeated solves of the ...Doctoral thesis 
Assessment of Sequential and Simultaneous Ensemblebased History Matching Methods for Weakly Nonlinear Problems
(The University of Bergen, 20150213)The ensemble Kalman filter (EnKF) has, since its introduction in 1994, gained much attention as a tool for sequential data assimilation in many scientific areas. In recent years, the EnKF has been utilized for estimating ...Doctoral thesis 
Classical and Stochastic Slit Löwner Evolution
(The University of Bergen, 20141010)Doctoral thesis 
Compositional reservoir simulation with emphasis on the IMPSAT formulation
(The University of Bergen, 20060407)Doctoral thesis 
Computeraided proofs and algorithms in analysis
(The University of Bergen, 20130614)The computational power has increased dramatically since the appearance of the first computers, making them a vital tool in the analysis of dynamical systems. We present further applications of those two basic ideas, ...Doctoral thesis 
Continuous Updating of a Coupled ReservoirSeismic Model Using an Ensemble Kalman Filter Technique
(The University of Bergen, 20070329)This work presents the development of a method based on the ensemble Kalman filter (EnKF) for continuous reservoir model updating with respect to the combination of production data, 3D seismic data and timelapse seismic ...Doctoral thesis 
Convective mixing in geological carbon storage
(The University of Bergen, 20111125)The industrial era has seen an exponential growth in the atmospheric concentration of carbon dioxide (CO2), resulting mainly from the burning of fossil fuels. This can cause changes in the climate that have severe impacts ...Doctoral thesis 
Derivation and numerical solution of fully nonlinear and fully dispersive water wave model equations
(The University of Bergen, 20170609)The water wave theory is a classical part of Fluid Mechanics. It has a long scientific history with a great number of mathematical results [10, 32]. The first studies in this field were done by Stokes in 1847 [34]. He ...Doctoral thesis 
Detecting Periodic Elements in Higher Topological Hochschild Homology
(The University of Bergen, 20130820)Doctoral thesis 
Efficient global minimization methods for variational problems in imaging and vision
(The University of Bergen, 20110819)Energy minimization has become one of the most important paradigms for formulating image processing and computer vision problems in a mathematical language. Energy minimization models have been developed in both the ...Doctoral thesis 
Ensemble Methods of Data Assimilation in Porous Media Flow for NonGaussian Prior Probability Density
(The University of Bergen, 20150828)Ensemblebased dataassimilation methods have gained fast growth since the ensemble Kalman filter (EnKF) was introduced into the petroleum engineering. Many techniques have been developed to overcome the inherent disadvantages ...Doctoral thesis 
Flow Properties of Fully Nonlinear Model Equations for Surface Waves
(The University of Bergen, 20171103)The focus of this thesis is wave motion in shallow water. In particular, we investigate some properties of flows underneath long waves in shallow water and present the results in two parts. The first part contains a ...Doctoral thesis 
General Slit Stochastic Löwner Evolution and Conformal Field Theory
(The University of Bergen, 20160122)Doctoral thesis 
Geological Storage of CO2: Sensitivity and Risk Analysis
(The University of Bergen, 20140410)Geological CO2 storage has the potential to be a key technology for prevention of industrial CO2 emission into the atmosphere. A successful storage operation requires safe geological structures with large storage capacity. ...Doctoral thesis 
Image processing, filtering and segmentation of datasets for reservoir simulation
(The University of Bergen, 20131011)Paper A: 2D Visualisation of Unstable Waterflood and Polymer Flood for Displacement of Heavy Oil. Fulltext not available in BORA. The published version is available at: <a href="http://dx.doi.org/10.2118/154292ms" ...Doctoral thesis 
Inversion of CSEM Data for Subsurface Structure Identification and Numerical Assessment of the Upstream Mobility Scheme
(The University of Bergen, 20150327)Part I In this part of the thesis, two different methodologies for solving the inverse problem of mapping the subsurface electric conductivity distribution using controlled source electromagnetic (CSEM) data are presented. ...Doctoral thesis 
LatticeBoltzmann modelling of spatial variation in surface tension and wetting effects
(The University of Bergen, 20100826)The main focus of the project which is the foundation of the thesis is to study the effects spatial variations in capillary effects have on fluid flow. This requires knowledge of the underlying fluid flow equations, and ...Doctoral thesis