Results 1 to 10 of about 2,148 (218)

Methane Hydration‐Shell Structure and Fragility

Angewandte Chemie, 2018
AbstractThe influence of oily molecules on the structure of liquid water is a question of importance to biology and geology and many other fields. Previous experimental, theoretical, and simulation studies of methane in liquid water have reached widely conflicting conclusions regarding the structure of hydrophobic hydration‐shells.
Xiangen Wu, Wanjun Lu, Louis M. Streacker, Henry S. Ashbaugh, Dor Ben‐Amotz   +4 more
openaire   +4 more sources

Methane hydrate stability and anthropogenic climate change [PDF]

Biogeosciences, 2007
Methane frozen into hydrate makes up a large reservoir of potentially volatile carbon below the sea floor and associated with permafrost soils. This reservoir intuitively seems precarious, because hydrate ice floats in water, and melts at Earth surface ...
D. Archer
doaj  

Role of Warming in Destabilization of Intrapermafrost Gas Hydrates in the Arctic Shelf: Experimental Modeling

Geosciences, 2019
Destabilization of intrapermafrost gas hydrates is one of the possible mechanisms responsible for methane emission in the Arctic shelf. Intrapermafrost gas hydrates may be coeval to permafrost: they originated during regression and subsequent cooling and
Evgeny Chuvilin, Dinara Davletshina, Valentina Ekimova, Boris Bukhanov, Natalia Shakhova, Igor Semiletov   +5 more
doaj   +1 more source

Determination of Priority Study Areas for Coupling CO2 Storage and CH4 Gas Hydrates Recovery in the Portuguese Offshore Area

Energies, 2015
Gas hydrates in sub-seabed sediments is an unexploited source of energy with estimated reserves larger than those of conventional oil. One of the methods for recovering methane from gas hydrates involves injection of Carbon Dioxide (CO2), causing the ...
Luís Bernardes, Júlio Carneiro, Pedro Madureira, Filipe Brandão, Cristina Roque   +4 more
doaj   +1 more source

Hydrates Formed with Binary CH₄/C₂H₆ Mixtures: Effects of Adding 25–75 vol% Ethane on the Quantity of Hydrates Formed, Growth Mechanism and Structure Preservation

C
This study explores the production of hydrates with binary (CH4/C2H6) gaseous mixtures, varying the concentration of each species from 25 to 75 vol%. The thermodynamics of this process are explored in detail, and the achieved results are explained in ...
Alberto Maria Gambelli, Daniela Pezzolla, Federico Rossi, Giovanni Gigliotti   +3 more
doaj   +1 more source

Data-driven discovery of methane hydrate promoters

npj Computational Materials
Methane hydrates require extreme conditions, and promoter discovery remains largely empirical. We develop a multimodal deep-learning framework that predicts methane-hydrate equilibrium pressures from molecular structure. Trained on over eighty promoters,
Yusung Ok, Youngjune Park
doaj   +1 more source

Distinct creep regimes of methane hydrates predicted by a monatomic water model

Physical Review Research
The power-law creep properties of methane hydrates were measured experimentally two decades ago, but their microscopic explanation is still missing. Here we show, using molecular dynamics simulations spanning almost 2 orders of magnitude of stresses and ...
Henrik Andersen Sveinsson, Pinqiang Cao
doaj   +1 more source

Characterization of methane hydrate extraction influenced by hydraulic fractures using a coupled thermo-hydro-mechanical-chemical model

Frontiers in Earth Science
The low permeability of the methane hydrate-bearing sediment limits the methane gas extraction. To enhance methane hydrate extraction, hydraulic fracturing can be a promising approach to improve the hydrate reservoir permeability by creating a fracture ...
Hao Sun, Xiangyu Xu, Chao Jia
doaj   +1 more source

Dissociation and Self-Preservation of Gas Hydrates in Permafrost

Geosciences, 2018
Gases releasing from shallow permafrost above 150 m may contain methane produced by the dissociation of pore metastable gas hydrates, which can exist in permafrost due to self-preservation.
Evgeny Chuvilin, Boris Bukhanov, Dinara Davletshina, Sergey Grebenkin, Vladimir Istomin   +4 more
doaj   +1 more source

Methane hydrate stability in seawater

Geophysical Research Letters, 1994
Experimental data are presented for methane hydrate stability conditions in seawater (S ≈ 33.5‰). For the pressure range of 2.75–10.0 MPa, at any given pressure, the dissociation temperature of mcthane hydrate is depressed by approximately −1.1°C relative to the pure methane‐pure water system.
Gerald R. Dickens, Mary S. Quinby‐Hunt
openaire   +1 more source