Blar i NTNU Open på forfatter "Landrø, Martin"
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Modeling fluid flow around an air gun bubble
Alvarez Busani, Wilfredo (Master thesis, 2014)In marine seismic acquisition, the bandwidth of the recorded signal is limited, on both the low and high end, and it is usually accepted that by towing the source deeper the low-frequency content in the seismic data increase. ... -
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 ... -
Next generation geophysical sensing: exploring a new wave of geophysical technologies for the energy transition
Ringrose, Philip; Landrø, Martin; Potter, John; Eidsvik, Jo; Wienecke, Susann; Bouffaut, Léa; Oye, Volker; Dong, Hefeng; Elster, Anne C.; Johansen, Ståle Emil (Peer reviewed; Journal article, 2021) -
On low frequencies emitted by air guns at very shallow depths - An experimental study
Wehner, Daniel; Landrø, Martin; Amundsen, Lasse (Journal article; Peer reviewed, 2019)In marine seismic acquisition, the enhancement of frequency amplitudes below 5 Hz is of special interest because it improves imaging of the subsurface. The frequency content of the air gun, the most commonly used marine ... -
Pore pressure estimation from single and repeated seismic data sets
Kvam, Øyvind (Doktoravhandlinger ved NTNU, 1503-8181; 2005:31, Doctoral thesis, 2005)Høye poretrykk utgjør en risiko for boreoperasjoner på Norsk Sokkel og internasjonalt. Denne risikoen kan reduseres dersom man har kjennskap til poretrykksforholdene før boring. Poretrykk er også en viktig parameter for ... -
Preservation of Low Frequencies in Broadband Data Processing
Dahl-Eriksen, Vegard (Master thesis, 2014)Recent developments in the seismic industry have introduced data with a broader frequency content than before. Broadband seismic data has led to challenges in the processing since the majority of the available algorithms ... -
Quantitative Refraction Traveltime Analysis of 3D Seismic Acquired After an Underground Blowout in the Central North Sea
Foseide, Bjarte (Master thesis, 2017)A quantitative refraction traveltime analysis was performed in this thesis. Refraction seismic can be used for monitoring in shallow parts of the subsurface where the contribution from conventional reflection data is ... -
Quantitative Seismic Monitoring
Borges, Filipe (Doctoral theses at NTNU;2022:127, Doctoral thesis, 2022)Seismic data is the main input for reservoir characterization in developing plays, when - in general - only conceptual geological models and few wells are available. When repeated over time, in a process called 4D seismic ... -
Quick clay monitoring using distributed acoustic sensing: A case study from Rissa, Norway
Rørstadbotnen, Robin Andre; Dong, Hefeng; Landrø, Martin; Duffaut, Kenneth; Growe, Kevin; Kakhkhorov, Umedzhon; Wienecke, Susann; Jacobsen, Joacim (Peer reviewed; Journal article, 2023)Quick clay avalanche is one of the most devastating landslide types worldwide. Hence, an early warning system is in demand to mitigate the fatal consequences caused by such events. To address this, distributed acoustic ... -
Reducing high-frequency ghost cavitation signals from marine air-gun arrays
Landrø, Martin; Ni, Yuan; Amundsen, Lasse (Journal article; Peer reviewed, 2016)Ghost cavitation, which is a term describing that cavitation bubbles are generated acoustically, has been hypothesized to occur when the ghost reflected signals from many individual air guns beneath the sea surface produce ... -
Repeatability of high-resolution 3D seismic data
Waage, Malin; Bünz, Stefan; Landrø, Martin; Plaza-Faverola, Andreia; Waghorn, Kate Alyse (Journal article; Peer reviewed, 2018)High-resolution 4D (HR4D) seismic data have the potential for improving the current state-of-the-art in detecting shallow (≤ 500 − 1000 m below seafloor) subsurface changes on a very fine scale (approximately 3–6 m). ... -
Seimic analysis of Carboniferous rift basin and Triassic growth-fault basins of Svalbard; analysis of seismic facies patterns with bearing on basin geometry and growth-strata successions
Bjerkvik, Anita Sørstrønen (Master thesis, 2012)This study analyzes 2D seismic sections of extensional growth-fault basins, covering two tectonic realms; (i) Carboniferous rifting in Central Spitsbergen, and (ii) shallow Triassic extensional basins of the SE Svalbard ... -
Seismic airgun sound propagation in shallow water of the East Siberian shelf and its prediction with the measured source signature
Han, Dong-Gyan; Kim, Sookwan; Landrø, Martin; son, Wuju; Lee, Dae Hyeok; Choi, Yeonjin; Jin, Young Keun; Hong, Jong Kuk; Kang, Sung-Ho; Rhee, Tae Siek; Shin, Hyoung Chul; La, Hyoung Sul (Peer reviewed; Journal article, 2023)Seismic airgun sound was measured with an autonomous passive acoustic recorder as a function of distance from 18.6 to 164.2 km in shallow water (<70 m) at the continental shelf of the East Siberian Sea in September 2019. ... -
Seismic AVO Analyses and the Impact of Anelastic Attenuation and Seismic Tuning - A Case Study from North Sea, close to Well 2/4-14
Grindstad, Elisabeth (Master thesis, 2017)There are verified thin sandstone layers saturated with oil and gas condensate at shallow depths in Block 2/4, Central North Sea. Gas-saturated sandstone layers are known to be good targets for AVO- analyses (Amplitude ... -
Self-supervised Underwater Source Localization based on Contrastive Predictive Coding
Zhu, Xiaoyu; Dong, Hefeng; Salvo Rossi, Pierluigi; Landrø, Martin (Peer reviewed; Journal article, 2021)This work introduces a two-step self-supervised learning scheme, namely contrastive predictive coding (CPC), for underwater source localization. In the first step, a CPC-based self-supervised feature extractor is trained ... -
Sensing whales, storms, ships and earthquakes using an Arctic fibre optic cable
Landrø, Martin; Bouffaut, Léa; Kriesell, Hannah Joy; Potter, John; Rørstadbotnen, Robin André; Taweesintananon, Kittinat; Johansen, Ståle Emil; Brenne, Jan Kristoffer; Haukanes, Aksel; Schjelderup, Olaf; Storvik, Frode (Peer reviewed; Journal article, 2022)Our oceans are critical to the health of our planet and its inhabitants. Increasing pressures on our marine environment are triggering an urgent need for continuous and comprehensive monitoring of the oceans and stressors, ... -
Shallow gas AVO analysis in Block 2/4 North Sea
Wang, Chunlei (Master thesis, 2014)The study site block 2/4 blowout area is challenging because of shallow thin sand and limitation of available well data. The high amplitude anomaly with fingering shape pattern was discovered at 520ms. This shallower sand ... -
Simultaneous tracking of multiple whales using two fiber-optic cables in the Arctic
Rørstadbotnen, Robin Andre; Eidsvik, Jo; Bouffaut, Léa; Landrø, Martin; Potter, John Robert; Taweesintananon, Kittinat; Johansen, Ståle Emil; Storvik, Frode; Jacobsen, Joacim; Schjelderup, Olaf; Wienecke, Susann; Johansen, Tor Arne; Ruud, Bent Ole; Wuestefeld, Andreas; Oye, Volker (Peer reviewed; Journal article, 2023)Climate change is impacting the Arctic faster than anywhere else in the world. As a response, ecosystems are rapidly changing. As a result, we can expect rapid shifts in whale migration and habitat use concurrent with ... -
Source Signature Estimation Based on Recordings in Deep-Towed Streamers Below the Source
Helgebostad, Kristian Svarva (Master thesis, 2017)Source-over-spread acquisition design is a recent development in marine seismic acquisition, aiming to improve imaging of the shallow subsurface. Contrary to conventional towed-streamer acquisition, source-over-spread ... -
Source-Depth Diversity for Enhanced Marine Seismic Imaging
Haavik, Kjetil Eik (Doctoral theses at NTNU;2016:319, Doctoral thesis, 2016)