A5084031102- Methane Hydrates and Related Phenomena
- Seismic Imaging and Inversion Techniques
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Hydraulic Fracturing and Reservoir Analysis
- Heavy Metal Exposure and Toxicity
- Geological Studies and Exploration
- Seismic Waves and Analysis
- Geological formations and processes
- Reservoir Engineering and Simulation Methods
- Arctic and Antarctic ice dynamics
- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Trace Elements in Health
- Cryospheric studies and observations
- Toxic Organic Pollutants Impact
- Geological and Tectonic Studies in Latin America
- Drilling and Well Engineering
- Probiotics and Fermented Foods
- Escherichia coli research studies
- Geological Modeling and Analysis
- Biochemical effects in animals
- Oceanographic and Atmospheric Processes
- Natural Antidiabetic Agents Studies
Indian Institute of Science Education and Research Pune
2018-2024
Chevron (United States)
2018
GEOMAR Helmholtz Centre for Ocean Research Kiel
2013-2017
Geological Survey of India
1975-2015
National Oceanography Centre
2011-2013
University of Southampton
2011-2013
Chevron (Netherlands)
2012
American Petroleum Institute
2009
Massachusetts Institute of Technology
1963-2009
The Research Council
2009
Hundreds of plumes methane bubbles, first observed in 2008, emanate from an area the seabed off West Svalbard that has become 1°C warmer over past 30 years. The distribution plumes, lying close to and upslope present upper limit hydrate stability zone, indicates could come warming‐induced dissociation, a process commonly invoked as contributing rapid climate change. We used numerical modeling investigate response beneath changes bottom‐water temperature periods up 1000 years B.P. delay...
Abstract During opening of a new ocean, magma intrudes into the surrounding sedimentary basins. Heat provided by intrusions matures host rock, creating metamorphic aureoles potentially releasing large amounts hydrocarbons. These hydrocarbons may migrate to seafloor in hydrothermal vent complexes sufficient volumes trigger global warming, e.g., during Paleocene-Eocene Thermal Maximum (PETM). Mound structures at top buried observed seismic data off Norway were previously interpreted as...
A borehole network consisting of five monitoring wells monitored the induced seismicity at a producing petroleum field for about [Formula: see text]. Nearly 5400 microseismic events were analyzed and used to image reservoir based on new double-difference (DD) seismic tomography. The DD tomography method simultaneously solved event locations text], text] models using absolute differential P, S, S-P arrival times. Microseismicity in was caused primarily by compaction above gas-bearing...
Active gas venting occurs on the uppermost continental slope off west Svalbard, close to and upslope from present‐day intersection of base methane hydrate stability (BMHS) with seabed in about 400 m water depth inter‐fan region between Kongsfjorden Isfjorden cross‐shelf troughs. From an integrated analysis high‐resolution, two‐dimensional, pre‐stack migrated seismic reflection profiles multibeam bathymetric data, we map out a bottom simulating reflector (BSR) analyze subsurface migration...
Methane is a potent greenhouse gas and large‐scale rapid release of methane from hydrate may have contributed to past abrupt climate change inferred the geological record. The discovery in 2008 over 250 plumes escaping seabed West Svalbard continental margin at ~400 m water depth (mwd) suggests that dissociating present‐day Arctic. Here we model dynamic response hydrate‐bearing sediments period 2300 years investigate ocean warming as possible cause for likely future dissociation hydrate,...
Submarine landslides pose significant risks to offshore infrastructure, such as seafloor telecommunication cables and oil gas pipelines. To address geohazards associated with mass transport processes, it is crucial understand the origin behaviour of ancient complexes (MTCs). This study investigates evolutionary stages kinematics a giant fossil MTC in Taranaki Basin, off West Coast North Island, New Zealand. The submarine landslide occurred during Pleistocene, covering an area ~ 21,856...
Abstract The formation of the Antarctic Circumpolar Current (ACC) is critical for evolution global climate, but timing its onset not well constrained. Here, we present new seismic evidence widespread Late Eocene to Oligocene marine diagenetic chert in sedimentary drift deposits east New Zealand indicating prolonged periods blooms siliceous microorganisms starting ~36 million years ago (Ma). These major reflect initiation arrival and upwelling northern-sourced, nutrient-rich deep equatorial...
Abstract [1] The ongoing warming of bottom water in the Arctic region is anticipated to destabilize some gas hydrate present shallow seafloor sediment, potentially causing release methane from dissociating into ocean and atmosphere. Ocean-bottom seismometer (OBS) experiments were conducted along continental margin western Svalbard quantify amount as or beneath seabed. P- S-wave velocities modeled for five sites margin, using ray-trace forward modeling. Two southern located vicinity a 30 km...
Abstract. Magmatic sill intrusions into organic-rich sediments cause the release of thermogenic CH4 and CO2. Pore fluids from Guaymas Basin (Gulf California), a sedimentary basin with recent magmatic activity, were investigated to constrain link between fluid seepage as well timing sill-induced hydrothermal activity. Sampling sites close vent field at northern rift axis cold seeps located up 30 km away rift. active showed slight imprint by indicated shallow circulation system transporting...
Abstract A bottom‐simulating reflector (BSR) occurs west of Svalbard in water depths exceeding 600 m, indicating that gas hydrate occurrence marine sediments is more widespread this region than anywhere else on the eastern North Atlantic margin. Regional BSR mapping shows presence and free several areas, with largest area located north Knipovich Ridge, a slow spreading ridge segment Mid Ridge system. Here heat flow high (up to 330 mW m −2 ), increasing toward axis. The coinciding maxima...
Abstract The Chatham Rise is located offshore of New Zealand's South Island. Vast areas the are covered in circular to elliptical seafloor depressions that appear be forming through a bathymetrically controlled mechanism, as 2–5 km diameter found water depths 800–1100 m. High‐resolution P‐Cable 3D seismic data were acquired 2013 across one these depressions. depression interpreted mounded contourite. Our reveal several smaller buried (<20–650 m diameter) beneath contourite we interpret...
PreviousNext No AccessSEG Technical Program Expanded Abstracts 2003On the inversion of time‐lapse seismic dataAuthors: Sudipta SarkarWences P. GouveiaDavid H. JohnstonSudipta SarkarEarth Resources Laboratory, Massachusetts Institute Technology, Wences GouveiaExxonMobil Upstream Research Company, and David JohnstonExxonMobil Companyhttps://doi.org/10.1190/1.1817575 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail...