Blar i forfatter "Vadakkepuliyambatta, Sunil"

Viser treff 21-28 av 28

    • Possible climate preconditioning on submarine landslides along a convergent margin, Nankai Trough (NE Pacific) 

      Kremer, Katrina; Usman, Muhammed; Satoguchi, Yasufumi; Nagahashi, Yoshitaka; Vadakkepuliyambatta, Sunil; Panieri, Giuliana; Strasser, Michael (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-25)
      Submarine landslides are major agents of sediment mass transfer from the shallow to deep sea. Due to their rapid emplacement and tsunamigenic potential, such landslides are significant geohazards for society and off- and on-shore infrastructure. The relationship between climate change and the occurrence of submarine landslides is widely debated. However, there is a lack of continuous long-term ...

    • Postglacial response of Arctic Ocean gas hydrates to climatic amelioration 

      Serov, Pavel; Vadakkepuliyambatta, Sunil; Mienert, Jurgen; Patton, Henry; Portnov, Aleksei D; Silyakova, Anna; Panieri, Giuliana; Carroll, Michael Leslie; Carroll, JoLynn; Andreassen, Karin; Hubbard, Alun Lloyd (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-05)
      Seafloor methane release due to the thermal dissociation of gas hydrates is pervasive across the continental margins of the Arctic Ocean. Furthermore, there is increasing awareness that shallow hydrate-related methane seeps have appeared due to enhanced warming of Arctic Ocean bottom water during the last century. Although it has been argued that a gas hydrate gun could trigger abrupt climate ...

    • Protracted post-glacial hydrocarbon seepage in the Barents Sea revealed by U–Th dating of seep carbonates 

      Himmler, Tobias; Wagner, Doris; Sahy, Diana; Vadakkepuliyambatta, Sunil; Chand, Shyam; Martma, Tõnu; Kirsimäe, Kalle; Mattingsdal, Rune; Panieri, Giuliana; Bünz, Stefan; Condon, Daniel J.; Knies, Jochen Manfred; Lepland, Aivo (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-01)
      The hydrocarbon seepage chronology during deglaciation across the formerly glaciated Barents Sea was established using uranium-thorium (U–Th) dating of seep carbonates. Seep carbonates were sampled with remotely operated vehicles (ROV) from the seafloor at three active hydrocarbon seeps (water depth 156–383 m), located in the north-west (Storfjordrenna), north-central (Storbanken High), and south-west ...

    • Quaternary and Neogene Reservoirs of the Norwegian Continental Shelf and the Faroe-Shetland Basin 

      Bellwald, Benjamin; Planke, Sverre; Vadakkepuliyambatta, Sunil; Buenz, Stefan; Batchelor, Christine L.; Manton, Ben; Zastrozhnov, Dmitry; Walker, Faye; Myklebust, Reidun (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-01)
      Glaciogenic reservoirs host important hydrocarbon resources across the globe. Examples such as the Peon and Aviat discoveries in the North Sea show that Quaternary and Neogene reservoirs can be prospective in the region. In this study, we interpret 2D and 3D reflection seismic data combined with borehole information to document unconventional play models from the shallow subsurface of the Norwegian ...

    • Shallow carbon storage in ancient buried thermokarst in the South Kara Sea 

      Portnov, Aleksei D; Mienert, Jürgen; Winsborrow, Monica; Andreassen, Karin; Vadakkepuliyambatta, Sunil; Semenov, Peter; Gataullin, Valery (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-25)
      Geophysical data from the South Kara Sea reveal U-shaped erosional structures buried beneath the 50–250 m deep seafloor of the continental shelf across an area of ~32 000 km<sup>2</sup>. These structures are interpreted as thermokarst, formed in ancient yedoma terrains during Quaternary interglacial periods. Based on comparison to modern yedoma terrains, we suggest that these thermokarst features ...

    • Spatial Changes in Gas Transport and Sediment Stiffness Influenced by Regional Stress: Observations From Piezometer Data Along Vestnesa Ridge, Eastern Fram Strait 

      Plaza-Faverola, Andreia; Sultan, Nabil; Lucchi, Renata Giulia; El bani Altuna, Naima; Ramachandran, Hariharan; Singhroha, Sunny; Cooke, Frances Ann; Vadakkepuliyambatta, Sunil; Mohamed, Mohamed Mahmoud Ezat Ahmed; Rasmussen, Tine Lander (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-25)
      Gas transport through sediments to the seabed and seepage occurs via advection through pores, faults, and fractures, and as solubility driven gas diffusion. The pore pressure gradient is a key factor in these processes. Yet, in situ measurements for quantitative studies of fluid dynamics and sediment deformation in deep ocean environments remain scarce. In this study, we integrate piezometer data, ...

    • Sub-seabed fluid-flow systems and gas hydrates of the SW Barents Sea and North Sea margins 

      Vadakkepuliyambatta, Sunil (Doctoral thesis; Doktorgradsavhandling, 2014-04-25)
      Denne avhandlingen omfatter studier av utbredelse og evolusjon av fluid migrasjonssystemer og gasshydrater i SV Barentshavet og nordlige Nordsjøen. Avhandlingen er basert på tolkning av seismiske og brønndata og numerisk modelling av hydratstabiliteten. Store fluid lekkasjestrukturer forekommer i SV Barentshavet og viser kobling mot de store tektoniske forkastningssytemene. Det er trolig istidene ...

    • Widespread subseafloor gas hydrate in the Barents Sea and Norwegian Margin 

      Cook, A.E.; Portnov, Alexey; Heber, R.C.; Vadakkepuliyambatta, Sunil; Bünz, Stefan (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-01)
      The distribution and concentration of subseafloor natural gas hydrate across margins is not well understood, because these systems are challenging to image and quantify remotely. Furthermore, it is unknown if shallow hydrate systems are linked to deeper oil and gas reservoirs. Herein, we analyze petroleum industry well logs with data in the gas hydrate stability zone and find that low concentrations ...