A5050553554- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Spacecraft and Cryogenic Technologies
- Atmospheric and Environmental Gas Dynamics
- CO2 Sequestration and Geologic Interactions
- Hydraulic Fracturing and Reservoir Analysis
- Inorganic Fluorides and Related Compounds
- Geological and Geophysical Studies
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Advanced NMR Techniques and Applications
- Chemical Synthesis and Characterization
- Seismic Imaging and Inversion Techniques
- Geological formations and processes
- Crystallization and Solubility Studies
- Crystallography and molecular interactions
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Geological Modeling and Analysis
- Geophysics and Gravity Measurements
- Drilling and Well Engineering
- Coal Properties and Utilization
- Covalent Organic Framework Applications
- Offshore Engineering and Technologies
National Institute of Advanced Industrial Science and Technology
2012-2025
Kitami Institute of Technology
2010-2025
All Russian Research Institute of Geology and Mineral Resources of the World Ocean
2009
V.I. Il'ichev Pacific Oceanological Institute
2009
Ghent University
2009
Sophia University
2004
Tokyo Institute of Technology
2000
We report the field observation of hydrate deposits different crystal structures in same cores a mud volcano Kukuy Canyon. link those to chemical fractionation during gas crystallization. Gas composition and crystallographic analyses samples reveal involvement two distinct source types formation at present or past: microbial (methane) thermogenic (methane ethane) types. The clathrate structure II, observed for first time fresh water sediments, is believed be formed by higher mixing gas.
The hydrate morphology of natural gas hydrate-bearing (GH) sediments recovered from the eastern Nankai trough area was investigated under hydrostatic pressurized conditions that prevent dissociation hydrates in a sediment. We developed novel X-ray computed tomography system and an attenuated total reflection infrared (ATR-IR) probe for use Instrumented Pressure Testing Chamber our set Pressure-Core Nondestructive Analysis Tools (PNATs), which can measure sediment structure, primary wave...
Pore-space gas hydrates sampled from the eastern Nankai Trough area off of Japan were minutely characterized using several instrumental techniques. Gas chromatographic results indicated that natural in sediment samples studied comprises mainly CH4. The concentrations minor components varied according to depth. powder X-ray diffraction patterns showed pore-space structure I (sI); lattice constants 1.183−1.207 nm. Both 13C NMR and Raman spectra confirmed CH4 molecules encaged sI hydrate...
Abstract Natural gas hydrates (or methane hydrates) could become a major energy source but also exacerbate global warming, because as the climate warms, hydrate deposits deep under oceans or in permafrost may release into atmosphere. There are many shallow of fine‐grained muddy sediments on seafloor. However, mechanical properties these have not yet been investigated engineering challenges coring and testing at situ temperatures pressures. Here we present first uniaxial triaxial strength...
Methane hydrates contain a certain number of empty cages that affect their stability and determine the gas-storage capacity material. In this study, effects temperature pressure on hydration methane were investigated in ranges 0.53–20.50 MPa 226–273 K, respectively. Raman spectroscopy measurements showed ranged from 5.88 to 6.12, decreasing with increasing temperature. The occupancy large 97 99%, indicating most occupied. contrast, small cage 82 96%, suggesting was significantly reduced...
Knowledge of cage occupancies and hydration numbers ( n ) naturally occurring gas hydrate in a local environment is important for the improvement global estimates hydrate‐bound natural gas. We report on differences number hydrates from Lake Baikal. Natural both structures I II (sI sII) ranging composition pure CH 4 to mixed containing up 15% C 2 H 6 are compared. The average = 6.1 sI recovered Malenky Bolshoy mud volcanoes, 6.2 hydrates, 3–4% K‐2 volcano, 6.9 sII about volcano. due small...
Movers and shakers: Vibrational states of CH4 molecules encaged in three clathrate hydrate structures are studied (see picture). Guest methane distribution the structure-H 512 435663 host cavities is revealed for first time. Raman profiles vibration dependent not only on types water cages, but also (guest compositions), suggesting distinctive differences molecular interactions between systems.