Characterizing the variability of natural gas hydrate composition from a selected site of the Western Black Sea, off Romania

Chazallon, Bertrand; Rodriguez, Carla T.; Ruffine, Livio; Carpentier, Y.; Donval, Jean-Pierre; Ker, Stéphan; Riboulot, Vincent

doi:10.1016/j.marpetgeo.2020.104785

Cited by 15 publications

(15 citation statements)

References 90 publications

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“…Hydrate formed by pure H2 is sII (line E). The mul- Apart from hydrocarbons, natural gas hydrates also contain inorganic molecules, such as N 2 , CO 2, and H 2 S [58,[66][67][68]. Their Raman shift is out of the region of hydrocarbons.…”

Section: Application Of Raman Spectroscopy To Clathrate Hydrate Studymentioning

confidence: 99%

“…Similarly, Liu, et al [72] estimated the cage occupancy of mixed CH 4 -CO 2 -N 2 gas hydrate via in situ Raman spectroscopy. Chazallon, et al [58] analyzed the natural gas hydrate sample from the Western Black Sea and obtained the spatial variability of the methane cage occupancy via Raman imaging.…”

Section: Application Of Raman Spectroscopy To Clathrate Hydrate Studymentioning

confidence: 99%

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Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Cai

Huang

2022

Energies

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Studies revealed that gas hydrate cages, especially small cages, are incompletely filled with guest gas molecules, primarily associated with pressure and gas composition. The ratio of hydrate cages occupied by guest molecules, defined as cage occupancy, is a critical parameter to estimate the resource amount of a natural gas hydrate reservoir and evaluate the storage capacity of methane or hydrogen hydrate as an energy storage medium and carbon dioxide hydrate as a carbon sequestration matrix. As the result, methods have been developed to investigate the cage occupancy of gas hydrate. In this review, several instrument methods widely applied for gas hydrate analysis are introduced, including Raman, NMR, XRD, neutron diffraction, and the approaches to estimate cage occupancy are summarized.

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Section: Application Of Raman Spectroscopy To Clathrate Hydrate Studymentioning

confidence: 99%

Section: Application Of Raman Spectroscopy To Clathrate Hydrate Studymentioning

confidence: 99%

Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Cai

Huang

2022

Energies

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“…This study only considers sI methane hydrate with 100% occupancy under a pressure at 0 K. In real life, the hydrate occupancy is approximately 85%, and the stability of the hydrate will decrease as the occupancy decreases. To further investigate the piezomechanical response, the pressure range studied is from −1.1 to 7.5 GPa, which can be achieved using the DFT methods.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Piezoelasticity of Methane Gas Hydrates: From Bonds to Cages to Lattices

2022

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For the past several decades, natural gas, also called methane gas, has been recognized as a green energy resource. It can generate energy by burning and produces fewer pollutants and carbon dioxide than coal and petroleum. For these reasons, it is also being viewed as a bridge fuel to renewable energy. Conservative estimates suggest that 80% of the naturally occurring hydrates on the planet contains natural gas. This vast amount translates to approximately twice the amount of energy stored in fossil fuels and oils. In addition, the special guest–host structure of gas hydrates provides a significant storage capacity, which makes the hydrate become a competitive candidate for carbon dioxide sequestration. However, the instability of hydrates during exploration becomes the biggest barrier for methane gas extraction and carbon dioxide sequestration. Thus, to overcome this barrier, this paper aims to investigate the stability limits and study the piezo effect of structure I (sI) methane gas hydrates at 0 K. This work investigates the structure, thermodynamics, and elasticity of sI methane hydrates subjected to pressure loads, at three scales, atoms, cages, and lattice, using the density functional theory in conjunction with homogenization methods and the theory of mixtures. The distribution functions of bond parameters are characterized in the hydrate system, which provides a novel understanding on the spread of values at the smallest scale. The roles of different types of cages at the mesoscale have been identified, such as continuous phase and disperse inclusion. At the continuum scale, the different deformation mechanisms are observed (affine and non-affine), which correspond to different fracture mechanisms (brittle and ductile) under tensile and compressive pressures, respectively. Taken together, the systematic atomic–cage–lattice multiscale characterization proves fruitful in linking processes that connect mechanical properties, cage geometry, and hydrogen bonding. The multiscale methodology can be generalized to other gas hydrates to improve the fundamental understanding and obtain engineering correlations.

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“…Isotope separations (Dd 13 C(CH 4 -CO 2 ), Dd 2 H(CH 4 -H 2 O)) substantiate that microbial carbonate reduction is the prevalent methanogenic pathway. 66 Using gas chromatography and Raman spectroscopy Chazallon et al 74 studied the variability of GH composition in the REEZ. Some highlights are that the hydrates are structure sI containing mainly CH 4 with small amounts of N 2 and CO 2 .…”

Section: Danube Fan Gas Hydrate Depositsmentioning

confidence: 99%

Black Sea gas hydrates: safe long terms storage of CO₂ with environmentally friendly energy production

Kvamme

Vasilev

2023

Sustainable Energy Fuels

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Characterizing the variability of natural gas hydrate composition from a selected site of the Western Black Sea, off Romania

Cited by 15 publications

References 90 publications

Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Multiscale Piezoelasticity of Methane Gas Hydrates: From Bonds to Cages to Lattices

Black Sea gas hydrates: safe long terms storage of CO₂ with environmentally friendly energy production

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Characterizing the variability of natural gas hydrate composition from a selected site of the Western Black Sea, off Romania

Cited by 15 publications

References 90 publications

Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Instrumental Methods for Cage Occupancy Estimation of Gas Hydrate

Multiscale Piezoelasticity of Methane Gas Hydrates: From Bonds to Cages to Lattices

Black Sea gas hydrates: safe long terms storage of CO2 with environmentally friendly energy production

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Product

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Black Sea gas hydrates: safe long terms storage of CO₂ with environmentally friendly energy production