Blar i Vitenskapelige publikasjoner (TN-IER) på tittel
Viser treff 1-20 av 116
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4D Surface Reconstruction of Micron-Sized Organic Calcite for the Characterization of Chemical Heterogeneity of Chalk Surfaces
(Peer reviewed; Journal article, 2023)Seawater injection into chalk reservoirs is a method for improved oil recovery (IOR) at the Norwegian Continental Shelf (NCS). During the injection of fluids for IOR, complex physicochemical interactions between the injected ... -
Adaptive machine learning-based surrogate modeling to accelerate PDE-constrained optimization in enhanced oil recovery
(Peer reviewed; Journal article, 2022)In this contribution, we develop an efficient surrogate modeling framework for simulation-based optimization of enhanced oil recovery, where we particularly focus on polymer flooding. The computational approach is based ... -
Adhesive forces between two cleaved calcite surfaces in NaCl solutions: The importance of ionic strength and normal loading
(Journal article; Peer reviewed, 2018-12-15)The mechanical strength of calcite bearing rocks is influenced by pore fluid chemistry due to the variation in nano-scale surface forces acting at the grain contacts or close to the fracture tips. The adhesion of two ... -
Analysis of filtering techniques for investigating landslide-induced topographic changes in the Oetz Valley (Tyrol, Austria)
(Peer reviewed; Journal article, 2020)Landslides endanger settlements and infrastructure in mountain areas across the world. Monitoring of landslides is therefore essential in order to understand and possibly predict their behavior and potential danger. ... -
An Analytical TOOLBOX for the Characterization of Chalks and Other Fine-Grained Rock Types within Enhanced Oil Recovery Research and Its Application—A Guideline
(Peer reviewed; Journal article, 2022-06)Analyses of fine-grained rocks like shales, cherts, and specifically chalk are challenging with regards to spatial resolution. We propose a “toolbox” to understand mineralogical alteration in chalk, especially those induced ... -
Application of machine learning to assess the value of information in polymer flooding
(Peer reviewed; Journal article, 2021-12)In this work, we provide a more consistent alternative for performing value of information (VOI) analyses to address sequential decision problems in reservoir management and generate insights on the process of reservoir ... -
Appraisal campaign selection based on the maximum value of sequential information
(Peer reviewed; Journal article, 2021-09)Field development projects generally demand large investments which are subject to geological uncertainty, hence projects can benefit from geological information obtained from appraisal wells before large capital commitment. ... -
Architecture of shoreface to deep-water systems in segmented rift systems: Evidence from the southern margin of the Sogn Graben, northern North Sea
(Peer reviewed; Journal article, 2020-03)Naturally fractured reservoirs are highly dependent on capillary forces to recover hydrocarbons during water injection. Water can spontaneously imbibe and expel oil if positive capillary forces exist; purely counter-current ... -
Assessment of a mature hydrocarbon field in SE Czech Republic for a CO2 storage pilot
(Lecture, 2022)Preparation and execution of a CO2 storage pilot project is one of the first logical steps in the effort to kick-start CCS in the region of Central & Eastern Europe, utilizing onshore geological structures for permanent ... -
Assessment of parameters effectiveness in the reserve estimation methods applicable to coal bed methane reservoirs
(Peer reviewed; Journal article, 2022)The reserve estimation of coal bed methane (CBM) reservoirs is ascertained through the analytical methods (volumetric method, material balance equation and decline curve analysis). However, the adoption of reserve estimation ... -
Bulk moduli and seismic attenuation in partially saturated rocks: hysteresis of liquid bridges effect
(Journal article; Peer reviewed, 2019-03-20)A key task of exploration geophysics is to find relationships between seismic attributes (velocities and attenuation) and fluid properties (saturation and pore pressure). Experimental data suggests that at least three ... -
cdem: A macOS program for discrete element modeling of tectonic structures
(Peer reviewed; Journal article, 2023-08)cdem is a macOS document-based application for two-dimensional discrete element modeling of tectonic structures and their associated deformation. Documents encapsulate simulations that can be run and explored simultaneously. ... -
Characteristic forced and spontaneous imbibition behavior in strongly water-wet sandstones based on experiments and simulation
(Peer reviewed; Journal article, 2022-05)Forced and spontaneous imbibition of water is performed to displace oil from strongly water-wet Gray Berea (~130 mD) and Bentheimer (~1900 mD) sandstone core plugs. Two nonpolar oils (n-heptane and Marcol-82) were used as ... -
Characterization and capillary pressure curve estimation of clayey-silt sediment in gas hydrate reservoirs of the South China Sea
(Peer reviewed; Journal article, 2023)The capillary pressure curve is a crucial basis for studying the pore structure and multiphase flow characteristics in oil and gas reservoirs. Due to the loose and unconsolidated nature of the clayey-silt sediment of natural ... -
Characterization based machine learning modeling for the prediction of the rheological properties of water‑based drilling mud
(Peer reviewed; Journal article, 2021)The successful drilling operation depends upon the achievement of target drilling attributes within the environmental and economic constraints but this is not possible only on the basis of laboratory testing due to the ... -
CO2 Convective Dissolution in Oil-Saturated Unconsolidated Porous Media at Reservoir Conditions
(Peer reviewed; Journal article, 2021)During CO2 storage, CO2 plume mixes with the water and oil present at the reservoir, initiated by diffusion followed by a density gradient that leads to a convective flow. Studies are available where CO2 convective mixing ... -
CO2 Dissolution and Convection in Oil at Realistic Reservoir Conditions: A Visualization Study.
(Peer reviewed; Journal article, 2021)CO2 convective mixing has been extensively studied for CO2 dissolution in saline water but very limited with the presence of oil. The objective of this work was to visually study the supercritical CO2 (sCO2) dissolution ... -
Comparison of intercept methods for correction of steady state relative permeability experiments for capillary end effects
(Peer reviewed; Journal article, 2022)Steady-state relative permeability experiments are performed by coinjection of two fluids through core plug samples. The relative permeabilities can be calculated using Darcy’s law from the stabilized pressure drop and ... -
Compositional variation of the Zechstein Group in the Norwegian North sea: Implications for underground storage in salt caverns
(Peer reviewed; Journal article, 2023)Halite beds in the upper Permian Zechstein Group represent an opportunity for the future development of underground storage caverns. However, geological factors such as lithological heterogeneities, cap rock characteristics ... -
Constrained non-linear AVO inversion based on the adjoint-state optimization
(Peer reviewed; Journal article, 2022)Pre-stack AVO inversion of seismic data is a modeling tool for estimating subsurface elastic properties. Our focus is on the model-based inversion method where then unknown variables are estimated by minimizing the misfit ...