Mechanical behaviors of natural gas hydrate-bearing clayey-silty sediments: Experiments and constitutive modeling

Zhao, Yapeng; Kong, Liang; Liu, Lele; Hu, Gaowei; Ji, Yunkai; Bu, Qingtao; Bai, Chenyang; Zhao, Jinhuan; Li, Jing; Liu, Jiaqi; Sang, Songkui

doi:10.1016/j.oceaneng.2024.116791

Cited by 7 publications

(1 citation statement)

References 69 publications

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“…Hydrate saturation is an essential indicator for evaluating hydrate resources through hydrate volume percentage in hydrate-bearing sediments (HBS). Different levels of hydrate saturation cause significant differences in the response of physical parameters such as acoustic velocity [11,12], resistivity [13,14], mechanical properties [15][16][17], and permeability [18,19] of HBS. Therefore, accurately obtaining hydrate saturation is essential for the accuracy of hydrate resource evaluation and the rationality of exploitation program formulation.…”

Section: Introductionmentioning

confidence: 99%

Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements

Wang,

Ji,

Liu

et al. 2024

JMSE

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Understanding the conversion characteristics of pore water is crucial for investigating the mechanism of hydrate accumulation; however, research in this area remains limited. This study conducted methane hydrate formation experiments in unconsolidated sands using an in-house low-field nuclear magnetic resonance (NMR) system. It focused on pore water conversion characteristics and influencing factors such as initial water saturation and sand particle sizes. Results show that methane hydrate formation enhances the homogeneity of the effective pore structure within sand samples. The conversion rate of pore water is significantly influenced by differences in heat and mass transfer capacity, decreasing as initial water saturation and sand size increase. Pore water cannot be fully converted into hydrates in unconsolidated sands. The final conversion ratio of pore water in water-poor sand samples nears 97%, while in water-rich sand samples, it is only 65.80%. Sand particle size variation has a negligible impact on the final conversion ratio of pore water, with ratios exceeding 94% across different particle sizes, differing by less than 3%.

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Section: Introductionmentioning

confidence: 99%

Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements

Wang,

Ji,

Liu

et al. 2024

JMSE

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Physical Similarity Simulation of Closely Stacked Coal Seams Mined in Faulted Geological Environments: A Comprehensive Experimental Investigation

Zhao,

Kong,

et al. 2024

Energy Science & Engineering

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The mining of closely stacked coal seams can be associated with complex stress fields, which makes mining difficult. In addition, closely stacked coal seams often coexist with faults and confined aquifers, further complicating mining activities. However, the study of closely stacked coal seams under complex geological conditions with faults (confined water) is very rare. In this study, an experimental approach was adopted to investigate the stress field and displacement field in rocks associated with closely stacked coal mining activity (complex geological conditions with faults and confined water). The materials used in the laboratory had similar physical properties to those present in the mining environment. The results showed that the overlying rock structure has three structural types and three caving forms. When the lower coal seam is mined, the collapse of the overlying strata is characterized by “caving with digging,” “no obvious periodic pressure step,” and “it is difficult to form a beam structure.” Faults function as a stress barrier, which makes it difficult for abutment pressure to cross a fault zone and form a stress concentration near the fault zone. When mining in faulted strata with confined water, there are three areas prone to water inrush, namely near the intersection with the fault zone and coal pillar, the boundary between the coal pillar and goaf, and the middle of the goaf. The research results are of great significance to the mining of closely stacked coal seams under complex geological conditions.

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Mechanical and deformation behavior of layered hydrate-bearing clayey-silty sediments: different effective confining pressures and clay content analyses

Sang,

Kong,

Zeng

et al. 2024

Acta Geotech.

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Mechanical behaviors of natural gas hydrate-bearing clayey-silty sediments: Experiments and constitutive modeling

Cited by 7 publications

References 69 publications

Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements

Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements

Physical Similarity Simulation of Closely Stacked Coal Seams Mined in Faulted Geological Environments: A Comprehensive Experimental Investigation

Mechanical and deformation behavior of layered hydrate-bearing clayey-silty sediments: different effective confining pressures and clay content analyses

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