Blar i Institutt for geovitenskap og petroleum på forfatter "Landrø, Martin"
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2-D Finite Difference Modelling and Analysis of Shallow Gas Leakage Scenarios, Using Time-Lapse Refraction
Rodríguez, Paola (Master thesis, 2013)4D seismic is a relatively new technology used aggressively in the oil industry, over the years it has proved its potential. However, there is a need for development of new techniques with high precision that enable the ... -
Acoustic generation of underwater cavities - Comparing modeled and measured acoustic signals generated by seismic air gun arrays
Khodabandeloo, Babak; Landrø, Martin; Hanssen, Alfred (Journal article; Peer reviewed, 2017)Underwater vapor cavities can be generated by acoustic stimulation. When the acoustic signals from several air guns are reflected from the sea surface, the pressure drop at some locations is sufficient for cavity growth ... -
Acoustic signals in air and water generated by very shallow marine seismic sources: An experimental study
Wehner, Daniel; Svensson, U. Peter; Landrø, Martin (Peer reviewed; Journal article, 2020)When a marine seismic source, like an airgun, is fired close to the water surface the oscillating bubble interacts with the water–air interface. The main interest for seismic applications is how this effect impacts the ... -
Acoustically induced cavity cloud generated by air-gun arrays—Comparing video recordings and acoustic data to modeling
Khodabandeloo, Babak; Landrø, Martin (Journal article; Peer reviewed, 2018)For seismic air-gun arrays, ghost cavitation is assumed to be one of the main mechanisms for high-frequency signal generation. Ghost cavitation signals are weak for seismic frequencies (<300 Hz) and do not contribute to ... -
AVO Analysis of Subglacial Forms in the North Sea, with the use of High Resolution 3D Seismic
Aarnes, Andreas Røysland (Master thesis, 2013)Shallow gas and overpressure are potential drilling hazards, and detailed mapping of such risks must be done prior to drilling to prevent loss of money, damage to equipment, and in the worst case, accidents on personnel. ... -
Broadband processing of conventional 3D seismic data for near surface geohazard investigation: A North Sea case study
Breistøl, Arv Håkon (Master thesis, 2015)3D exploration seismic data is increasingly being utilized for geohazard studies in the offshore oil and gas industry. An important criterion for the success of this approach is that the seismic data contain the broadest ... -
Bubble Effects on Seismic Data caused by Seawater Temperature Variations.
Gule, René Meringdal (Master thesis, 2014)At the 76th EAGE Conference in June 2014, professor Martin Landrø proposed a new equation for the air gun bubble time period that includes the effect of varying sea water temperature. The work in this thesis has been to ... -
Characterizing the acoustic properties of the cavity cloud generated close to an air-gun array as a time-dependent effective medium
Khodabandeloo, Babak; Landrø, Martin (Journal article, 2018)A ghost cavity cloud consists of many small vapour cavities and appears above and around the air-guns in the source array a few milliseconds after the source is fired. Since there are dissolved gases and stable microbubbles ... -
Data-driven Borehole Imaging and Monitoring
Liu, Yi (Doctoral theses at NTNU;2017:329, Doctoral thesis, 2017) -
Deghosting of Marine Seismic Data Using Dual Sensor Technology
Haavik, Kjetil Eik (Master thesis, 2013)An inevitable phenomenon called the ghost reflection has always been a problem in marine seismic acquisition. The great contrast in acoustic properties over the air-water interface is causing an almost perfect reflection ... -
Detecting gas leakage using high-frequency signals generated by air-gun arrays
Landrø, Martin; Hansteen, Fredrik; Amundsen, Lasse (Journal article; Peer reviewed, 2017)Recent field experiments have demonstrated that marine air-gun arrays create acoustic energy greater than 1 kHz. We have suggested to use the high-frequency signal as a source to look for gas leakage at, for instance, a ... -
Distributed acoustic sensing of ocean-bottom seismo-acoustics and distant storms: A case study from Svalbard, Norway
Taweesintananon, Kittinat; Landrø, Martin; Potter, John Robert; Johansen, Ståle Emil; Rørstadbotnen, Robin Andre; Bouffaut, Léa; Kriesell, Hannah Joy; Brenne, Jan Kristoffer; Haukanes, Aksel; Schjelderup, Olaf; Storvik, Frode (Peer reviewed; Journal article, 2023)Distributed acoustic sensing (DAS) leverages an ocean-bottom telecommunication fiber-optic cable into a densely sampled array of strain sensors. We demonstrate DAS applications to passive acoustic monitoring (PAM) through ... -
Diving-wave time-lapse delay for CO2 thin layer detection
Martinez Guzman, Ricardo Jose; Vinje, Vetle; Stovas, Alexei; Mispel, Joachim; Ringrose, Philip Stefan; Duffaut, Kenneth; Landrø, Martin (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 ... -
Eavesdropping at the Speed of Light: Distributed Acoustic Sensing of Baleen Whales in the Arctic
Bouffaut, Léa; Taweesintananon, Kittinat; Kriesell, Hannah Joy; Rørstadbotnen, Robin André; Potter, John; Landrø, Martin; Johansen, Ståle Emil; Brenne, Jan Kristoffer; Haukanes, Aksel; Schjelderup, Olaf; Storvik, Frode (Peer reviewed; Journal article, 2022)In a post-industrial whaling world, flagship and charismatic baleen whale species are indicators of the health of our oceans. However, traditional monitoring methods provide spatially and temporally undersampled data to ... -
Estimating Overburden Dilation Factors Using Geomechanical Modeling, Time-Lapse Seismic and Bathtymetry Data - A Case Study from The Ekofisk Field
Kvilhaug, Arnstein (Master thesis, 2017)As reservoir compaction is causing variations in both layer thickness and seismic velocities, it is of interest to distinguish between these two effects. The dilation factor R can be used to link the geophysical observables ... -
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 ...