Browsing UiS Brage by Author "Weibull, Wiktor Waldemar"
Now showing items 1-19 of 19
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4D elastic AVO inversion of seismic data from the Sleipner CCS project
Berland, Lars Erik (Master thesis, 2024)In seismic inversion, the goal is to reconstruct unknown subsurface model variables, such as elastic velocities, from seismic measurements. This thesis focuses on the application of a novel adjoint-state based elastic ... -
Acquisition, Processing and Interpretation of Ground Penetrating Radar (GPR) Data in Aidonia, Greece
Wasilewska, Sylwia (Masteroppgave/UIS-TN-IER/2020;, Master thesis, 2020)The Mycenaean Cemetery of Aidonia, Greece, is located about 10 km west of the town of New Nemea on the Peloponnese peninsula. In this cemetery, a number of chamber tombs dating from 1600-1100 B.C. was discovered in the ... -
Adjoint-state method for seismic AVO inversion and time-lapse monitoring
Ahmed, Nisar (PhD thesis UiS;, Doctoral thesis, 2023)This dissertation presents seismic amplitude versus offset (AVO) inversion methods to estimate water saturation and effective pressure quantitatively in elastic and viscoelastic media. Quantitative knowledge of the saturation ... -
Constrained non-linear AVO inversion based on the adjoint-state optimization
Ahmed, Nisar; Weibull, Wiktor Waldemar (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 ... -
Contribution of Geosciences in the Study of Anthropogenic Activities in Different Temporal and Spatial Contexts
Gutierrez Mozo, Ivan David (PhD thesis UiS;, Doctoral thesis, 2024)From Homo sapiens, anthropogenic activities have impacted Earth systems at different spatial and time scales, particularly since the mid-twentieth century as the geological record confirms. Such impact has triggered Earth ... -
Converted wave imaging and velocity analysis using elastic reverse-time migration
Ebrahim, Farid (Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06-22)Along the continuous evolution of exploration seismology, the main objective has been producing better subsurface seismic images that lead to lower risk exploration and enhanced production. The unique characteristics of ... -
Data Assimilation Methods in Seismic Inversion
Li, Geng (Masteroppgave/UIS-TN-IER/2018;, Master thesis, 2018-06)Full-waverform inversion (FWI) is a powerful tool for getting high resolution images from seismic data to understand formations and the reservoir characteristics. But the inversion problems usually do not have unique ... -
Frequency-dependent AVO inversion applied to physically based models for seismic attenuation
Ahmed, Nisar; Weibull, Wiktor Waldemar; Quintal, Beatriz; Grana, Dario; Bhakta, Tuhin (Peer reviewed; Journal article, 2022)Seismic inversion of amplitude versus offset (AVO) data in viscoelastic media can potentially provide high-resolution subsurface models of seismic velocities and attenuation from offset/angle seismic gathers. P- and S-wave ... -
Ground penetrating radar and seismic study to determine glacial deposit stratigraphy
Alcantara Rodriguez, Maria Antonieta (Masteroppgave/UIS-TN-IER/2018;, Master thesis, 2018-06-14)This work reviews two near-surface geophysical methods, ground penetrating radar and seismic, covering all the processes from the data acquisition to the interpretation. The area of study, Jæren, is located over glacial ... -
Holistic 3D Model of an Urban Area in Norway: An Integration of Geophysical, Geotechnical, Remote Sensing, and Geological Methods
Gutierrez Mozo, Ivan David; Weibull, Wiktor Waldemar; Watson, Lisa; Olsen, Thomas Meldahl; Escalona Varela, Alejandro (Peer reviewed; Journal article, 2023)Understanding the distribution and characterization of natural and non-natural materials on the surface and near-subsurface is important for the development of infrastructure projects. This may be a challenge in highly ... -
Holistic 3D Model of an Urban Area in Norway: An Integration of Geophysical, Geotechnical, Remote Sensing, and Geological Methods
Gutierrez Mozo, Ivan David; Weibull, Wiktor Waldemar; Watson, Lisa; Olsen, Thomas Meldahl; Escalona Varela, Alejandro (Peer reviewed; Journal article, 2023)Understanding the distribution and characterization of natural and non-natural materials on the surface and near-subsurface is important for the development of infrastructure projects. This may be a challenge in highly ... -
Integrating high-resolution seismic inversion with geotechnical data for offshore wind applications
Olarewaju, Modupe Abayomi (Master thesis, 2024)Norway's objective is to generate 30GW of offshore energy by 2040 in order to obtain its 2050 Net Zero targets. In 2020, two areas were opened (Utsira Nord and Sørlige Nordsjø II) on the Norwegian continental margin for ... -
Investigating the PS seismic imaging of faults using seismic modelling and data from the Snøhvit field, Barents Sea
Cunningham, Jennifer Elizabeth; Weibull, Wiktor Waldemar; Cardozo, Nestor; Iacopini, David (Peer reviewed; Journal article, 2021)PS seismic data from the Snøhvit field are compared with seismic modelling to understand the effect of azimuthal separation and incidence angle on the imaging of faults and associated horizon discontinuities. In addition, ... -
A Novel Approach for Autonomous Densely Spaced Acquisition of Buried Objects in Intertidal Environments—Field Examples From Avaldsnes, Norway
Olsen, Thomas Meldahl; Weibull, Wiktor Waldemar; Escalona, Alejandro; Vivås, Arild (Peer reviewed; Journal article, 2024-07)Underwater archaeology relies on expensive and time-consuming invasive methods for identifying and excavating objects buried in the seabed or identifying layers in shallow and intertidal environments. Especially shallow ... -
Processing techniques to enhance imaging of ultra-high frequency seismic data acquired with P-Cable technology
Storaas, Øystein (Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06-15)P-Cable seismic acquisition system is a rather new technology; developed through the past 20 years. Consequently, the use of P-Cable technology has been limited, although researchers still believe that further improvements ... -
Rock weakness zone detecting using first-arrival traveltime tomography in underwater tunnel construction settings
Østhus, Hanna (Master thesis, 2024)Identifying geological weakness zones is crucial in the early stages of subsurface projects, yet it poses significant challenges due to the limited prior knowledge of rock properties and structural features. This thesis ... -
Seismic imaging with primaries and multiples
Kakhkhorov, Umedzhon (Masteroppgave/UIS-TN-IER/2019;, Master thesis, 2019-06-15)Multiples are usually considered as noise in seismic images due to their interferences with primary reflections. In recent years, new imaging methods have been developed which consider multiples as secondary sources to ... -
Simultaneous AVO inversion and seismic lithology cube estimation by using PP and PS angle stack seismic data of the Oseberg Field, North Sea
Kausar, Tayyaba (Masteroppgave/UIS-TN-IER/2018;, Master thesis, 2018-06)Converted seismic wave data is not yet commonly used in oil industry. In an offshore environment Ocean Bottom Cables (OBCs) are needed to register the converted S-waves in addition to the P-waves which makes the acquisition ... -
Time lapse seismic analysis of the Tohoku-Oki 2011 earthquake
Landrø, Martin; Kodaira, Shuichi; Fujiwara, toshiya; No, Tetsuo; Weibull, Wiktor Waldemar; Arntsen, Børge (Peer reviewed; 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 ...