Browsing NTNU Open by Author "Arntsen, Børge"
Now showing items 21-40 of 41
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How to adapt numerical simulation of wave propagation and ultrasonic laboratory experiments to be comparable — A case study for a complex topographic model
Solymosi, Bence; Favretto-Cristini, Nathalie; Monteiller, Vadim; Komatitsch, Dimitri; Cristini, Paul; Arntsen, Børge; Ursin, Bjørn (Journal article; Peer reviewed, 2018)Numerical methods are widely used in seismic exploration to simulate wave propagation; however, the algorithms are based on various assumptions. The accuracy of numerical simulations is of particular interest in the case ... -
Identification and Effects of Thin Vertical Intrusions on Seismic Data
Lødemel, Håvard (Master thesis, 2013)In this report I consider a case with a simple three-dimensional two-layer model penetrated by a thin vertical intrusion. Synthetic seismic data is generated, and a number of events are identified. The identified events ... -
Integration of Electromagnetic and Seismic data to improve sub-salt and sub-basalt imaging
Panzner, Martin (Doctoral theses at NTNU;2021:147, Doctoral thesis, 2021)This thesis investigates how the marine Controlled Source Electromagnetic (CSEM) method and the marine MagnetoTelluric (MT) method can be used in combination for subsurface imaging in the presence of basalt and salt. A ... -
Inter-source seismic interferometry by multidimensional deconvolution (MDD) for borehole sources
Liu, Yi; Arntsen, Børge; Wapenaar, Kees; Romdhane, Anouar (Book, 2014)Seismic interferometry (SI) is usually implemented by crosscorrelation (CC) to retrieve the impulse response between pairs of receiver positions. An alternative approach by multidimensional deconvolution (MDD) has been ... -
Inverse Scattering Series internal multiple prediction through utilization of sparse transforms - Including high-performance implementational aspects
Aaker, Ole Edvard (Master thesis, 2018)Industry standard imaging algorithms do not treat internal multiples correctly. 'Cross-talk' with primary reflections may therefore occur in the imaging procedure, potentially causing significant artifacts in the image of ... -
Migration Study of the Uranus Prospect in the Barents Sea: Evaluation of Velocity Sensitivity, Wave Equation Migration and Acquisition Geometry
Brunsvik, Fride Maria Hope (Master thesis, 2012)Imaging of salt is a known geophysical challenge, since salt has complex geology, with varying lithology and complicated structures. Salt diapir can have steep dips and obtaining a correct velocity models are some of the ... -
Modelling acoustic pressure of very shallow airguns.
Andleeb, Mughal (Master thesis, 2022)A surge of advancements in air-gun technologies propels geophysicists to ask the uncomfortable question. Is there an alternative to equipment-based low-frequency enhancement? Most marine seismic acquisition setups are ... -
Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway
Taweesintananon, Kittinat; Rørstadbotnen, Robin Andre; Landrø, Martin; Johansen, Ståle Emil; Arntsen, Børge; Forwick, Matthias; Hansen, Alfred (Peer reviewed; Journal article, 2024)Shear-wave (S-wave) resonances are typically observed when the surficial marine sediments over a rock substrate have relatively low S-wave velocities. We observe these phenomena using ocean-bottom fiber-optic distributed ... -
Obtaining the Source Wavefield from Multicomponent Data and its Application in Full Waveform Inversion
Vaaland, Uno Brosten (Master thesis, 2015)In full waveform inversion (FWI) we need to know the seismic source signature. In practice this is generally unknown, and it must be estimated using statistical methods or inversion. However, these methods rely on assumptions ... -
Optimizing 3D Finite Difference Solvers for the Elastic Wave Equation for Modern GPUs
Haugdahl, Tor Andre (Master thesis, 2022)Partielle Differensialligninger (PDEer) omfatter særdeles viktige matematiske verktøy for å modellere reelle fenomener slik som jordskjelv og bølgeforplantning. Finte Difference Metoden (FDM) er en numerisk metode som ... -
Retrieving virtual reflection responses at drill-bit positions using seismic interferometry with drill-bit noise
Liu, Yi; Draganov, Deyan; Wapenaar, Kees; Arntsen, Børge (Journal article; Peer reviewed, 2016)In the field of seismic interferometry, researchers have retrieved surface waves and body waves by cross-correlating recordings of uncorrelated noise sources to extract useful subsurface information. The retrieved wavefields ... -
Rock physics inversion for CO2 characterization at Sleipner
Yan, Hong (Master thesis, 2017)We combine Full-Waveform Inversion (FWI) and rock physics inversion to provide quantitative estimates of CO2 saturation at Sleipner. The rock physics tool is based on uniform saturation and patchy saturation rock physics ... -
Rock Physics Inversion for CO2 Saturation Estimation at Sleipner - Sensitivity Tests and Baseline Application
Yan, Hong; Dupuy, Bastien; Romdhane, Anouar; Arntsen, Børge (Chapter, 2017)We demonstrate the use of rock physics inversion for estimating CO2 saturation and rock frame properties at the Sleipner CO2 storage pilot in the North Sea. We investigate the relation between rock physics properties and ... -
Seismic attribute study of the source rock for the Norne area
Gasimov, Ayaz (Master thesis, 2012)This work represents itself a study of seismic attributes of the source rock in the Norne area. The study is divided into several parts: such study of anisotropy from seismic data and as well as from the well log scale. ... -
Seismic waveform inversion using the iterative ensemble Kalman smoother
Gineste, Michael (Doctoral theses at NTNU;2020:323, Doctoral thesis, 2020) -
Time lapse seismic analysis of the Tohoku-Oki 2011 earthquake
Landrø, Martin; Kodaira, Shuichi; Fujiwara, toshiya; No, Tetsuo; Weibull, Wiktor Waldemar; Arntsen, Børge (Journal article, 2019)A detailed time lapse seismic analysis of subsurface movements is presented using seismic 2D lines acquired prior to and after the Tohoku-Oki earthquake offshore Japan in 2011. Estimated movements of the seabed from the ... -
Time-lapse Processing of 2D Seismic over the Japan Trench
Guha, Arindam (Master thesis, 2018)The seismic surveys SR97-101 (baseline) and D19 (monitor), acquired over the Japan Trench, were processed using an open-source software (Madagascar) with aims on detecting changes from the Tohoku-Oki earthquake. The surveys ... -
Time-lapse Seismic Analysis of the Tohoku Earthquake
Kristensen, Eivind (Master thesis, 2017)A time lapse seismic comparison of subsurface movements before and after the 2011 Tohoku earthquake is presented in this report. In order to successfully conduct this comparison, an entire processing sequence from raw data ... -
Transmission Wave- Equation Envelope Tomography Towards automated seismic travel-time waveform inversion
Venstad, Jon Marius (Doctoral theses at NTNU;2016:270, Doctoral thesis, 2016) -
Up- and downgoing borehole wavefield retrieval using single component borehole and reflection data
Liu, Yi; Arntsen, Børge; van der Neut, Joost; Wapenaar, Kees (Journal article; Peer reviewed, 2018)A standard procedure in processing vertical seismic profile (VSP) data is the separation of up- and downgoing wavefields. We show that these wavefields in boreholes can be retrieved using only single-component data, given ...