Institutt for geovitenskap og petroleum: Recent submissions
Now showing items 1-20 of 2520
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Fault growth and orthogonal shortening in transtensional supradetachment basins: Insights from the `Old Red´ of western Norway
(Journal article; Peer reviewed, 2023)For basins that evolve adjacent to large-magnitude normal faults, tectonic controls on sedimentation involve isostatic back rotation of an exhuming footwall and, commonly, the evolution of kilometre-scale extension-parallel ... -
Design of multi-luminescent silica-based nanoparticles for the detection of liquid organic compounds
(Journal article; Peer reviewed, 2024)Tracer testing in reservoir formations is utilised to determine residual oil saturation as part of optimum hydrocarbon production. Here, we present a novel detection method of liquid organic compounds by monodisperse SiO2 ... -
A new approach for real-time prediction of stick–slip vibrations enhancement using model agnostic and supervised machine learning: a case study of Norwegian continental shelf
(Journal article; Peer reviewed, 2023)Efficient and safe drilling operations require real-time identification and mitigation of downhole vibrations like stick-slip, which can significantly diminish performance, reliability, and efficiency. This pioneering ... -
Estimation of cuttings concentration during drilling using experimental data - a hybrid computational intelligence modeling approach
(Doctoral theses at NTNU;2024:58, Doctoral thesis, 2024)Poor hole cleaning can be quite costly as it can lead to different operational problems such as mechanical stuck pipe, premature bit wear, slow drilling progress, formation fracturing, excessive drillstring torque and drag ... -
Probabilistic Economic Assessment of an Offshore Energy Hub Supplying Electrical Power to a Floating Production Storage and Offloading Unit
(Chapter, 2023)This paper analyzes the viability of an offshore energy hub consisting of wind turbines, batteries, fuel cells and electrolyzers connected to, and powering, an oil producing floating production storage and offloading unit. ... -
Early Holocene thinning and final demise of the Scandinavian Ice Sheet across the main drainage divide of southern Norway
(Journal article; Peer reviewed, 2023)The thinning and final decay of the Scandinavian Ice Sheet in the Gudbrandsdalen area in central southern Norway is described, based on (1) cosmogenic 10Be surface exposure dating of 25 glacially transported boulders, (2) ... -
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 ... -
Third-order elasticity of transversely isotropic field shales
(Peer reviewed; Journal article, 2023)The formations above a producing reservoir can exhibit large mechanical changes, creating a risk of significant subsidence and loss of rock integrity. These changes can be monitored by time-lapse seismic acquisition, which ... -
Rock-avalanche deposit causes extreme high indoor radon concentrations in Kinsarvik, Ullensvang municipality, Western Norway
(Peer reviewed; Journal article, 2023)The radon problem in Kinsarvik, Ullensvang municipality in Western Norway, is among the most severe in the world. Annual average indoor radon concentrations as high as 56,000 Bq/m3 have been measured. The problem affects ... -
A thicker Antarctic ice stream during the mid-Pliocene warm period
(Peer reviewed; Journal article, 2023)Ice streams regulate most ice mass loss in Antarctica. Determining ice stream response to warmer conditions during the Pliocene could provide insights into their future behaviour, but this is hindered by a poor representation ... -
rockphypy: An extensive Python library for rock physics modeling
(Peer reviewed; Journal article, 2023)Rock physics aims to understand the relationship between the physical properties of rocks and geophysical observables under various conditions. The generic knowledge provides valuable insights into the behavior of subsurface ... -
Detrital zircons of the vast Triassic Snadd and De Geerdalen formations, Barents Shelf, reveal temporal changes in sediment source
(Peer reviewed; Journal article, 2023)Studies of detrital-zircon age distributions from Triassic sedimentary rock successions on the Arctic Barents Shelf have resulted in different provenance interpretations. Here, we provide new U–Pb/Hf detrital-zircon data ... -
Experimental study of seismic dispersion: Influence of clay mineral content
(Journal article; Peer reviewed, 2023)We conducted an extensive study on the elastic properties of Opalinus Clay and the overlying and underlying rock formations, which range in the overall clay mineral content from nearly 0 wt.% to 60 wt.%. Our laboratory ... -
Diving-wave time-lapse delay for CO2 thin layer detection
(Peer reviewed; Journal article, 2024)We have derived an analytical approximate expression to estimate the delay in diving seismic waves due to thin layers of CO2. The expression is valid for high frequencies and can be used to estimate the delay in diving ... -
Shape of a frictional fluid finger
(Peer reviewed; Journal article, 2023)Frictional fluid dynamics describes the displacement patterns that arise when a confined mixture of liquid and grains are displaced by an immiscible fluid under pressures that are too small to cause drainage into single ... -
Marine minerals' role in future holistic mineral resource management
(Journal article; Peer reviewed, 2022) -
Hydraulic properties of the Excavation damage zone
(Master thesis, 2023)Denne avhandlingen undersøker de hydrauliske egenskapene i sprengningsskadesonen. Arbeidet inkluderer numeriske modelleringer av et nytt tunnelkonsept med tanke på vann og frostsikring som utføres ved Hestnes jernbanetunnel. ... -
Bioreagents in froth flotation and flocculation of copper, iron and cerium oxides
(Doctoral theses at NTNU;2024:29, Doctoral thesis, 2024) -
A case study on time-dependent bedding plane failure
(Journal article; Peer reviewed, 2023)Time-delayed wellbore failures are often observed in shale formation. In some cases, cavings indicating bedding plane failure are observed a few days after initial drill-out with a gradual increase, eventually leading to ... -
A Full Laboratory Study on the Physical and Mechanical Properties of a Bismuth Plug
(Chapter, 2023)Well plugging and abandonment can be very expensive, time consuming and problematic. This is because it is the least considered process during a well's life cycle. Setting a plug downhole in an efficient and successful ...