Blar i NTNU Open på forfatter "Arntsen, Børge"
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2-D and 2.5-D Multi-scale Full-Waveform Inversion in frequency domain for high-resolution P-wave velocity (Vp) and quality factor (Q) models at Sleipner field.
Pinto Guerrero, Henderson Gabriel (Master thesis, 2018)In this work, we have applied a multi-scale discretized Full-Waveform Inversion in frequency-space domain considering both the 2-D and 3-D viscoacoustic wave equation for deriving P-wave velocity (Vp) and quality factor ... -
3D least-squares reflectivity inversion for deep reservoir imaging with complex North Sea overburden settings
Owe, Kristine (Master thesis, 2020)I dette studiet brukes minste-kvadrats migrasjon i et forsøk på å produsere forbedrede bilder fra Gullfaks Sør feltet. Området har flere geofysiske utfordringer, includert komplisert geologi, gass skyer og en kile-struktur ... -
3D Seismic Modelling of Thin Intrusions
Karlsen, Stian (Master thesis, 2014)This study presents seismic modeling of two intrusions, modeled as boreholes.The modeling was done over homogenous one-layered models in both 2D and 3D,and a two-layered model in 3D. The goal of the study was to see if ... -
An Integrated Visualization Technique for Wellbore Placement
Ramfjord, Mats Stivang (Master thesis, 2014)The placement of new wells in a mature field can be very challenging. There may be many drilling hazards present. Drilling into a hazard can cause severe problems. In a cluster of wells and other hazards, it can be difficult ... -
CO2 saturation estimates at Sleipner (North Sea) from seismic tomography and rock physics inversion
Yan, Hong; Dupuy, Bastien; Romdhane, Mohamed Anouar; Arntsen, Børge (Journal article; Peer reviewed, 2018)CO2 saturations are estimated at Sleipner using a two‐step imaging workflow. The workflow combines seismic tomography (full‐waveform inversion) and rock physics inversion and is applied to a two‐dimensional seismic line ... -
Data-driven Borehole Imaging and Monitoring
Liu, Yi (Doctoral theses at NTNU;2017:329, Doctoral thesis, 2017) -
Effect of Curvature on Seismic Data and Amplitude Analysis: A Modeling Study
Heiebråten, Eivind Bøhn (Master thesis, 2014)The effect of curvature upon AVO-analysis and the capability of Kirchhoff time migration to remove these effects were investigated in this thesis. Curvature focuses or de-focuses seismic waves depending on the shape of the ... -
The effects of anisotropy on AVO behavoir on shallow reflectors from Sleipner
Raftevold, Britt Lunde (Master thesis, 2015)AVO analysis is an important tool in discriminating between oil, gas and brine saturated rocks in a given reservoir unit. Although, to use AVO analysis can be challenging as there are many pitfalls connected to different ... -
Effekten av streamer feathering på seismisk data
Lorentsen, Henriette Solhaug (Master thesis, 2019)Når en seismisk kabel blir eksponert for sterke havstrømmer i løpet av en 2D seismisk undersøkelse, blir den planlagte 2D undersøkelsen isteden til en 3D seismisk undersøkelse med begrenset dekning. Kablene drives sidelengs ... -
Elastic Full Waveform Inversion of Synthetic Data: Marmousi2 Model Test Study
Skot-Hansen, Johan (Master thesis, 2014)Full waveform inversion (FWI) is a computationally extensive technique used to obtain estimates of subsurface rock parameters from seismic data. Initial models are iteratively improved by fitting forward modeled data to ... -
Elastodynamic full waveform inversion on GPUs with time-space tiling and wavefield reconstruction
Aaker, Ole Edvard; Raknes, Espen Birger; Arntsen, Børge (Peer reviewed; Journal article, 2020)Full waveform inversion (FWI) is a procedure used to determine the elastic parameters of the Earth by reducing the misfit between observed elastodynamic wavefields and their numerically modelled counterparts. The numerical ... -
Experimental Studies of the Acoustic Signal generated by Marine Seismic Sources
Wehner, Daniel (Doctoral theses at NTNU;2019:80, Doctoral thesis, 2019)Marine seismic acquisition is the most commonly used geophysical technique to image the subsurface for different purposes, e.g. exploration of reservoirs or investigation of subduction zones as areas where earthquakes are ... -
Full waveform inversion and wave equation migration using 4D seismic from the Sleipner Field - A CO2-monitoring study
Bjøringsøy, Amanda Nagypal (Master thesis, 2017)In this study, two surveys from the Sleipner field in the North Sea are investigated. The surveys cover the same area, but are acquired at different times - respectively before and after the initiation of CO2 injection. ... -
Full Waveform Inversion of Gas Hydrates: Application to estimate of hydrate saturation
Hovland, Rebecca Petterteig (Master thesis, 2014)Through seismic acquisitions there have been discovered layers beneath the seabedthat consist of pores filled with gas hydrates (GH). These reservoirs are potentialenergy reserves and it is therefore desirable to get an ... -
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 ... -
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 ... -
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 ... -
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 ...