A5073439671- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Seismic Imaging and Inversion Techniques
- Atmospheric and Environmental Gas Dynamics
- Seismic Waves and Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Drilling and Well Engineering
- Geological Modeling and Analysis
- Offshore Engineering and Technologies
- Distributed and Parallel Computing Systems
UiT The Arctic University of Norway
2015-2023
Geological Survey of Denmark and Greenland
2023
Centre for Arctic Gas Hydrate, Environment and Climate
2015-2023
University of Nebraska–Lincoln
2022
Indian Institute of Technology Dhanbad
2022
University of Oslo
2022
Volcanic Basin Petroleum Research (Norway)
2022
Gas hydrates occur within sediments on the western Svalbard continental margin and Vestnesa Ridge, a large sediment drift that extends in west-northwest direction from toward mid-ocean ridge. We acquired multicomponent ocean-bottom seismic (OBS) data at 10 locations crest area of eastern segment an with active gas seepage. P S wave velocities are estimated using traveltime inversion, self-consistent approximation/differential effective medium rock physics modeling is used to estimate hydrate...
Abstract Gas transport through sediments to the seabed and seepage occurs via advection pores, faults, fractures, as solubility driven gas diffusion. The pore pressure gradient is a key factor in these processes. Yet, situ measurements for quantitative studies of fluid dynamics sediment deformation deep ocean environments remain scarce. In this study, we integrate piezometer data, geotechnical tests, core analyses study regime that controls along Vestnesa Ridge eastern Fram Strait. data show...
Abstract Joint analysis of electrical resistivity and seismic velocity data is primarily used to detect the presence gas hydrate‐filled faults fractures. In this study, we present a novel approach infer occurrence structurally controlled hydrate accumulations using azimuthal analysis. We perform ocean‐bottom at two sites on Vestnesa Ridge, W‐Svalbard Margin. Previous geophysical studies inferred hydrates shallow depths (up ~190–195 m below seafloor) in marine sediments Ridge. analyze P ‐wave...
We have estimated the seismic attenuation in gas hydrate and free-gas-bearing sediments from high-resolution P-cable 3D data Vestnesa Ridge on Arctic continental margin of Svalbard. a broad bandwidth (20–300 Hz), which is extremely advantageous estimating medium. The quality factor (Q), inverse attenuation, set using centroid frequency shift spectral ratio (SR) methods. method establishes relationship between change an amplitude spectrum Q value SR estimates medium by studying differential...
Seafloor hydrocarbon seepage is a natural fluid release process that occurs worldwide on continental shelves, slopes, and in deep oceanic basins. The Vestnesa sedimentary ridge the eastern Fram Strait hosts deep-water gas hydrate system became charged with hydrocarbons ∼2.7 Ma has experienced episodic along entire until few thousand years ago, when activity apparently ceased west but persisted east. Although it been documented faults fractures play key role feeding seeps thermogenic gases,...
Short duration events (SDEs) are reported worldwide from ocean-bottom seismometers (OBSs). Due to their high frequency (4–30 Hz) and short duration, they commonly attributed aseismic sources, such as fluid migration related processes cold seeps, biological signals, or noise. We present the results of a passive seismic experiment that deployed an OBS network for 10-month (October 2015–July 2016) at active seepage site on Vestnesa Ridge, West Svalbard continental margin. characterize SDEs...
The presence of a gas hydrate reservoir and free layer along the South Shetland margin (offshore Antarctic Peninsula) has been well documented in recent years. In order to better characterize reservoirs, with particular focus on quantification petrophysical properties subsurface, we performed travel time inversion ocean-bottom seismometer data obtain detailed P- S-wave velocity estimates sediments. P-wave field is determined by refractions reflections, while obtained from converted-wave...
RV Helmer Hanssen is the only vessel operating so far north (81 N) in October. One of research questions addressed during this cruise is: Where do gas hydrate exist seabed and how much methane does it actually release? The CAGE 15-6 explored potential charged sub-seabed environments release zones at Storfjordrenna, Vestnesa Svyatogor Ridge, Yermak Plateau, Sofia Basin west Prins Karls Foreland. Our route was traceable by www.sailwx.com. weather forecasts from www.windyty.comwere used to...
Abstract Mechanisms related to sub‐seabed fluid flow processes are complex and inadequately understood. Petrophysical properties, availability of gases, topography, stress directions, various geological parameters determine the location intensity leakage which change over time. From tens seafloor pockmarks mapped along Vestnesa Ridge on west‐Svalbard margin, only six show persistent present‐day seepage activity in sonar data. To investigate causes such restricted gas seepage, we conducted a...
<p>Methane seepage on continental margins derived from shallow gas reserves and hydrate stores is significant globally, with initial observations most commonly pockmark expressions the seafloor. The processes driving fluid flow (liquids gases) through upper (200m) marine sediments not well understood. Pockmarks signify present or past events, are prominent across Vestnesa Ridge. Not all pockmarks active (venting), suggesting that mechanism behind varies ridge. ...
The overall goal of this expedition was the acquisition geophysical data on Vøring Plateau and southernmost part Lofoten Basin to improve understanding subsurface structures geological processes at four sites (U1571-U1574) where scientific drilling recently successfully completed as a International Ocean Discovery Program (IODP) Expedition 396
 cruise may be known as: CAGE22_5