Browsing NTNU Open by Author "Landrø, Martin"
Now showing items 21-40 of 71
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Estimating saturation and density changes caused by CO2 injection at Sleipner - Using time-lapse seismic amplitude-vartiation-with-offset and time-lapse gravity
Landrø, Martin; Zumberge, Mark A. (Journal article; Peer reviewed, 2017)We have developed a calibrated, simple time-lapse seismic method for estimating saturation changes from the CO2CO2-storage project at Sleipner offshore Norway. This seismic method works well to map changes when CO2CO2 is ... -
Estimating seabed velocities from normal modes
Eiesland, Ole Wostryck (Master thesis, 2012)In this Master Thesis a method for estimating seabed p-wave velocities from normal mode seismic data is developed. This is done through forward modeling using two dimensional finite difference modeling to generate synthetic ... -
Estimating source signatures from source-over-spread marine seismic data
Helgebostad, Kristian; Landrø, Martin; Vinje, Vetle; Nilsen, Carl-Inge Colombo (Journal article; Peer reviewed, 2018)Recent developments in marine seismic acquisition include deploying a source vessel above a towed-streamer spread. We have developed an inversion algorithm to estimate source signatures for such acquisition configurations, ... -
Estimation of Anisotropy Parameters and AVO modeling of the Troll Field, North Sea
Haktorson, Hilde (Master thesis, 2012)In the work of this Master's thesis, the anisotropy parameters, epsilon and delta, for the reservoir and the cap rock on the Troll Field have been estimated. This was done using well logs from 35 wells, including the P-wave ... -
Estimation of rock physics properties from seismic attributes - Part 2: Applications
Dupuy, Bastien; Garambois, Stéphane; Asnaashari, Amir; Balhareth, Hadi Mohammed; Landrø, Martin; Stovas, Alexey; Virieux, Jean (Journal article; Peer reviewed, 2016)The estimation of quantitative rock physics properties is of great importance for reservoir characterization and monitoring in CO2CO2 storage or enhanced oil recovery as an example. We have combined the high-resolution ... -
Estimation of Seismic Parameters by Source Strength Variation: An Experimental Analysis using Valhall Data
Jakobsen, Fredrik G (Master thesis, 2013)In 2008 at SEG's annual meeting Professor Martin Landrø proposed a new way of deriving 4D noise by source strength variation. It was proposed that by shooting two surveys over the exact same area and process the datasets ... -
Estimation of Temperature Profiles using Low-Frequency Distributed Acoustic Sensing from In-Well Measurements
Bradley, Nicholas Adam; Haavik, Kjetil Eik; Landrø, Martin (Peer reviewed; Journal article, 2023)Distributed fiber-optic sensing for in-well measurements is primarily used for monitoring purposes. Distributed acoustic sensing (DAS) is used to record acoustic disturbances and is sensitive to changes in strain, pressure, ... -
Estimation of Water Velocity and Tidal Changes Between 4D Seismic Vintages
Teien, Ole Martin (Master thesis, 2017)Between the acquisitions of the vintages used in 4D seismic, both the seismic water velocity and the tidal level can change. These changes will create time shifts that reduce the 4D seismic's sensitivity to real changes ... -
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 ... -
Feature Selection Based on Principal Component Regression for Underwater Source Localization by Deep Learning
Zhu, Xiaoyu; Dong, Hefeng; Salvo Rossi, Pierluigi; Landrø, Martin (Peer reviewed; Journal article, 2021)Underwater source localization is an important task, especially for real-time operation. Recently, machine learning methods have been combined with supervised learning schemes. This opens new possibilities for underwater ... -
Frequency-depth-dependent spherical reflection response from the sea surface - a transmission experiment
Wehner, Daniel; Landrø, Martin; Amundsen, Lasse; Westerdahl, Harald (Journal article; Peer reviewed, 2018)In academia and the industry, there is an increasing interest in generating and recording low seismic frequencies, which lead to better data quality, deeper signal penetration and can be important for full-waveform inversion. ... -
Gas flow through shallow sediments - A case study using passive and active seismic field data
Landrø, Martin; Wehner, Daniel; Vedvik, Noralf; Ringrose, Philip; Løhre, Nora Løw; Berteussen, Karl-Andreas (Journal article; Peer reviewed, 2019)Offshore Quaternary sediment sequences are generally weak and unconsolidated, and fluid flow through these rock formations is hard to predict or model. Surface flow observations, such as gas seeps, often appear random and ... -
High frequency ghost cavitation - a comparison of two seismic air-gun arrays using numerical modeling
Khodabandeloo, Babak; Landrø, Martin (Journal article; Peer reviewed, 2017)Ghost cavitation is probably the mechanism behind the majority of high frequencies (above 5 kHz) generated by seismic air-gun arrays. Such high frequencies are less important in seismic reflection imaging. High frequency ... -
Iceberg ploughmarks illuminated by shallow gas in the central North Sea
Haavik, Kjetil Eik; Landrø, Martin (Journal article; Peer reviewed, 2014)Conventional 3D seismic data provides direct evidence for glacial influence during the early Pleistocenesedimentation in the Central North Sea. We identify iceberg ploughmarks as dim linear to curve-linearfeatures in three ... -
Integration of Time Shift Data and Acoustic Impedance - And Complex Time-Lapse Imaging
Sletten, Karl Oskar (Master thesis, 2015)This thesis consists of several projects related to time-lapse seismic data from the Norne field. For the first part of this thesis, I have investigated methods for integration of the time shift data and the seismic ... -
Low-frequency acoustic signal created by rising air-gun bubble
Wehner, Daniel; Landrø, Martin (Journal article; Peer reviewed, 2017)In the seismic industry, there is increasing interest in generating and recording low frequencies, which leads to better data quality and can be important for full-waveform inversion. The air gun is a seismic source with ... -
Mapping of shallow Tunnel Valleys combining 2D and 3D Seismic Data
Halvorsen, Hanne Sundgot (Master thesis, 2012)In this study 19 tunnel valleys within block 2/4 in the central North Sea basin have been mapped. Furthermore, the possibility for these valleys to act as migration paths for leaked gas has been evaluated. In January 1989 ... -
Mapping Reservoir Changes Using 4D Seismic on the Norne G-segment, Norwegian Sea
Aschjem, Gunnar (Master thesis, 2013)Time-lapse seismic can be an important tool for monitoring and planing further development of a producing hydrocarbon field. Use of 4D seismic can make itpossible to detect production changes over a relatively large area ... -
Micro-Oscillations in Seismic Signals - An Investigation Into Possible Multi-Bubble Origins
Wikstøl, Marcus Bolle (Master thesis, 2018)Since its first use in the early 20th century, seismic acquisition has become the most utilised method of marine hydrocarbon exploration. At its core, the method relies upon pressure imbalances between a bubble of pressurised ... -
Modeling and characterizing acoustic signals from cavity clouds generated by marine seismic air-gun arrays: Implications for marine mammals
Khodabandeloo, Babak (Doctoral theses at NTNU;2018:239, Doctoral thesis, 2018)Marine seismic air-gun arrays generate not only low-frequency (<∼300 Hz) acoustic waves which benefit seismic imaging, but also high-frequencies up to tens of kilohertz. Although such high-frequencies are much weaker than ...