In-situ visual observation for the formation and dissociation of methane hydrates in porous media by magnetic resonance imaging

Zhao, Jiafei; Lv, Qin; Li, Yanghui; Yang, Mingjun; Liu, Weiguo; Yao, Lei; Wang, Shenglong; Zhang, Yi; Song, Yongchen

doi:10.1016/j.mri.2014.12.010

Cited by 54 publications

(24 citation statements)

References 31 publications

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“…These high water saturation bands likely reflected areas with smaller pore sizes than the adjacent areas where the water was displaced by gas. The initial fast hydrate growth in these bands containing tighter pores is similar to the increased growth rate observed for smaller grain sizes [11,19]. Preferred formation of hydrate in high water saturation regions was also observed by Seol & Kneafsey [20].…”

Section: Methane Hydrate Growthsupporting

confidence: 79%

“…The onset of hydrate formation is detected as a loss of signal when liquid water converts to hydrates, and hydrate dissociation is recognized as a signal increase when liquid water re-appears during hydrate dissociation. This technique has previously been reported to track the amount of water in sediments both spatially and temporally during hydrate growth and dissociation [11][12][13]. MRI has also been used to prove the concept of CO 2 -CH 4 exchange when methane hydrate in sandstone is exposed to CO 2 [8,14].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation

2019

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This paper reports formation and dissociation patterns of methane hydrate in sandstone. Magnetic resonance imaging spatially resolved hydrate growth patterns and liberation of water during dissociation. A stacked core set-up using Bentheim sandstone with dual water saturation was designed to investigate the effect of initial water saturation on hydrate phase transitions. The growth of methane hydrate (P = 8.3 MPa, T = 1–3 °C) was more prominent in high water saturation regions and resulted in a heterogeneous hydrate saturation controlled by the initial water distribution. The change in transverse relaxation time constant, T2, was spatially mapped during growth and showed different response depending on the initial water saturation. T2 decreased significantly during growth in high water saturation regions and remained unchanged during growth in low water saturation regions. Pressure depletion from one end of the core induced a hydrate dissociation front starting at the depletion side and moving through the core as production continued. The final saturation of water after hydrate dissociation was more uniform than the initial water saturation, demonstrating the significant redistribution of water that will take place during methane gas production from a hydrate reservoir.

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Section: Methane Hydrate Growthsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation

2019

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“…They are effective methods to determine the water content in porous media using the cumulative amplitude of T 2 distribution (Ge et al, ; Kleinberg et al, ) and the signal intensity of magnetic resonance image (Wang et al, ; Zhao et al, ). In this study, both ends of the core sample were connect with bulk water during the permeability measurement.…”

Section: Methodsmentioning

confidence: 99%

“…image (Wang et al, 2015;Zhao et al, 2015). In this study, both ends of the core sample were connect with bulk water during the permeability measurement.…”

Section: Journal Of Geophysical Research: Solid Earthmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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The permeability of sediments is an important parameter that effects flow characteristics of the gas and water in the process of natural gas hydrates development. The distribution of gas hydrate is generally heterogeneous in porous media. It poses a great challenge to the permeability measurement of hydrate‐bearing sediments. To study the effect of heterogeneous distribution of methane hydrate on the permeability of porous media, methane hydrate formation in the sandstone and permeability measurement was carried out using a low‐field nuclear magnetic resonance (NMR) measurement system in situ conditions. The spatial distribution of methane hydrate in the core samples was determined by combining the T2 distribution with magnetic resonance imaging. The results show that the distribution of methane hydrate is heterogeneous in the core samples. The temporal and spatial variation of permeability happens in the process of hydrate dissociation. The heterogeneity of methane hydrate distribution severely affects the analysis of permeability change. Considering the heterogeneity of methane hydrate distribution, a new method was proposed to obtain the quantitative relationship between hydrate saturation and relative permeability based on magnetic resonance imaging and the equivalent seepage capacity method. The results show that the relative permeability models obtained by this method agree better with experimental results. The optimum coefficients of relative permeability models obtained by equivalent seepage capacity method change significantly in contrast with the direct fitting method. The variation of the optimum coefficient is up to 300% in this study. The model coefficients are related to the pore characteristic of hydrate‐free porous media.

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“…In order to understand formation morphologies and kinetics in porous media, many researchers have investigated hydrate formation behaviors in porous media. Distinct stages of formation for hydrate growth in porous media were observed (Katsuki et al, 2007;Fitzgerald et al, 2014;Zhang et al, 2014;Zhao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of particle and pore sizes on the formation behaviors of methane hydrate in porous silica gels

Chen

et al. 2016

Journal of Natural Gas Science and Engineering

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In-situ visual observation for the formation and dissociation of methane hydrates in porous media by magnetic resonance imaging

Cited by 54 publications

References 31 publications

Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation

Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Effects of particle and pore sizes on the formation behaviors of methane hydrate in porous silica gels

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