Pore-scale study of the multiphase methane hydrate dissociation dynamics and mechanisms in the sediment

Yang, Junyu; Xu, Qianghui; Liu, Zhiying; Shi, Lin

doi:10.1016/j.cej.2021.132786

Cited by 27 publications

(12 citation statements)

References 58 publications

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“…1−3 CH 4 hydrates are ice-like inclusion compounds in which CH 4 molecules as guests are encapsulated inside hydrogen-bonded water cages. 4,5 A comprehensive understanding of the crystal dissolution through multiscale analysis using experiments and simulations at the molecular 6,7 and crystal 8,9 levels of CH 4 hydrates 10,11 is required.…”

Section: ■ Introductionmentioning

confidence: 99%

“…These phenomena are important for a fundamental understanding of phase transitions and nonequilibrium phenomena. With regard to natural resources on earth, CH 4 emission from CH 4 hydrates owing to their dissolution is of concern as a contributor to hydrate-related global climate change, along with the CH 4 seepage from the seafloor. − CH 4 hydrates are ice-like inclusion compounds in which CH 4 molecules as guests are encapsulated inside hydrogen-bonded water cages. , A comprehensive understanding of the crystal dissolution through multiscale analysis using experiments and simulations at the molecular , and crystal , levels of CH 4 hydrates , is required.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Study on Dissolution of Natural Methane Hydrate by Multicontrast and Multiscale X-ray Computed Tomography

Takeya,

Hachikubo,

Sakagami

et al. 2023

J. Phys. Chem. C

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Study on Dissolution of Natural Methane Hydrate by Multicontrast and Multiscale X-ray Computed Tomography

Takeya,

Hachikubo,

Sakagami

et al. 2023

J. Phys. Chem. C

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“…Previous studies have documented the transport mechanism of the multiscale pore structure in shale reservoirs through methane diffusion experiments and modeling experiments. − It is generally believed that in the early stage of shale gas production, free gas rapidly flows from the intercrystalline pores of berry-shaped pyrite (Figure F), carbonate dissolution pores(Figure G), and the intercrystalline pores of clay minerals (Figure H), through free molecular diffusion and Knudsen diffusion mechanism after fracturing damage of reservoir (corresponding to Figure stage I). As the pressure decreases, the adsorbed gas in the pores (mainly refers to the micropores and small mesopores with a width of less than 10 nm) is desorbed by surface diffusion and mixed with free gas to into the large pores or cracks of the matrix and be produced (corresponding to Figure stage II).…”

Section: Discussionmentioning

confidence: 99%

Nanopore Structure and Origin of Lower Permian Transitional Shale, Eastern Ordos Basin, China

et al. 2022

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Nanopores in the shale play a vital role in methane adsorption, and their structural characteristics and origins are of great significance for revealing the mechanism of methane adsorption, desorption, and diffusion. In this paper, through low-temperature ashing and low-pressure gas adsorption experiments, the nanopore structure of original shales and ashed shales was quantitatively characterized, and the nanopore origins in the transitional shale of lower Permian in eastern Ordos Basin were analyzed. The results show that the pore volume (PV) and specific surface area (SSA) of nanopores in transitional shale reservoirs are 0.0217–0.0449 cm 3 /g and 13.91–51.20 m 2 /g, respectively. The average contribution rates of micropores (<2 nm), mesopores (2–50 nm), and macropores (50–100 nm) to PV are 18.78, 72.26, and 8.96%, respectively, and the average contribution rates to SSA are 66.19, 33.10, and 0.71%, respectively. In addition, it is found that the average contribution rates of inorganic minerals and organic matter to the SSA of micropores are 55.9 and 44.1%, respectively, and the average contribution rates to the SSA of mesopores are 92.3 and 7.7%, respectively. Combining the adsorption properties of the main clay minerals and kerogen in shale, it is concluded that organic pores control the adsorption of methane with an absolute advantage in transitional shales. It is of great significance to understand the mechanism of methane occurrence, desorption, and diffusion in shales by clarifying the origins of multiscale pores.

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“…On the other, especially in low-permeability, fine-grained sediments, excess pore-pressure can lead to sediment fracturing (e.g., [77,78]), thus facilitating methane escape towards the seafloor [44,46]. In addition, as hydrate destabilisation progresses, the pore-scale distribution of phases (i.e., pore-volume ratio occupied by the different solid, aqueous and gas phases) evolves, leading to large changes in the reservoir's permeability and the multiphase flow behaviour [79]. The resulting flow characteristics will control methane transport and significantly influence the amount of dissolved methane available for microbial consumption [56].…”

Section: Hydrate Destabilisation and Multiphase Transport Of Methanementioning

confidence: 99%

Assessing the Benthic Response to Climate-Driven Methane Hydrate Destabilisation: State of the Art and Future Modelling Perspectives

et al. 2022

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Modern observations and geological records suggest that anthropogenic ocean warming could destabilise marine methane hydrate, resulting in methane release from the seafloor to the ocean-atmosphere, and potentially triggering a positive feedback on global temperature. On the decadal to millennial timescales over which hydrate-sourced methane release is hypothesized to occur, several processes consuming methane below and above the seafloor have the potential to slow, reduce or even prevent such release. Yet, the modulating effect of these processes on seafloor methane emissions remains poorly quantified, and the full impact of benthic methane consumption on ocean carbon chemistry is still to be explored. In this review, we document the dynamic interplay between hydrate thermodynamics, benthic transport and biogeochemical reaction processes, that ultimately determines the impact of hydrate destabilisation on seafloor methane emissions and the ocean carbon cycle. Then, we provide an overview of how state-of-the-art numerical models treat such processes and examine their ability to quantify hydrate-sourced methane emissions from the seafloor, as well as their impact on benthic biogeochemical cycling. We discuss the limitations of current models in coupling the dynamic interplay between hydrate thermodynamics and the different reaction and transport processes that control the efficiency of the benthic sink, and highlight their shortcoming in assessing the full implication of methane release on ocean carbon cycling. Finally, we recommend that current Earth system models explicitly account for hydrate driven benthic-pelagic exchange fluxes to capture potential hydrate-carbon cycle-climate feed-backs.

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Pore-scale study of the multiphase methane hydrate dissociation dynamics and mechanisms in the sediment

Cited by 27 publications

References 58 publications

Microstructural Study on Dissolution of Natural Methane Hydrate by Multicontrast and Multiscale X-ray Computed Tomography

Microstructural Study on Dissolution of Natural Methane Hydrate by Multicontrast and Multiscale X-ray Computed Tomography

Nanopore Structure and Origin of Lower Permian Transitional Shale, Eastern Ordos Basin, China

Assessing the Benthic Response to Climate-Driven Methane Hydrate Destabilisation: State of the Art and Future Modelling Perspectives

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