A Monte Carlo Model of Gas-Liquid-Hydrate Three-phase Coexistence Constrained by Pore Geometry in Marine Sediments
文献类型：期刊论文
| 作者 | Chen, Jiangzhi1 ; Rempel, Alan W.2; Mei, Shenghua1
|
| 刊名 | FRONTIERS IN EARTH SCIENCE
 |
| 出版日期 | 2021-02-18 |
| 卷号 | 8页码:12 |
| 关键词 | gas hydrates wetting irregular pores capillary effects clathrates |
| DOI | 10.3389/feart.2020.600733 |
| 英文摘要 | Gas hydrates form at relatively high pressures in near-surface, organic-rich marine sediments, with the base of the hydrate stability field and the onset of partial gas saturation determined by temperature increases with depth. Because of pore-scale curvature and wetting effects, the transition between gas hydrate and free gas occurrence need not take place at a distinct depth or temperature boundary, but instead can be characterized by a zone of finite thickness in which methane gas bubbles and hydrate crystals coexist with the same aqueous solution. Previous treatments have idealized pores as spheres or cylinders, but real pores between sediment grains have irregular, largely convex walls that enable the highly curved surfaces of gas bubbles and/or hydrate crystals within a given pore to change with varying conditions. In partially hydrate-saturated sediments, for example, the gas-liquid surface energy perturbs the onset of gas-liquid equilibrium by an amount proportional to bubble-surface curvature, causing a commensurate change to the equilibrium methane solubility in the liquid phase. This solubility is also constrained by the curvature of coexisting hydrate crystals and hence the volume occupied by the hydrate phase. As a result, the thickness of the three-phase zone depends not only on the pore space geometry, but also on the saturation levels of the hydrate and gaseous phases. We evaluate local geometrical constraints in a synthetic 3D packing of spherical particles resembling real granular sediments, relate the changes in the relative proportions of the phases to the three-phase equilibrium conditions, and demonstrate how the boundaries of the three-phase zone at the base of the hydrate stability field are displaced as a function of pore size, while varying with saturation level. The predicted thickness of the three-phase zone varies from tens to hundreds of meters, is inversely dependent on host sediment grain size, and increases dramatically when pores near complete saturation with hydrate and gas, requiring that interfacial curvatures become large. |
| 资助项目 | National Natural Science Foundation of China[41674097] ; Chinese Academy of Sciences[QYZDY-SSW-DQC029] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000625132700001 |
| 出版者 | FRONTIERS MEDIA SA |
| 资助机构 | National Natural Science Foundation of China ; Chinese Academy of Sciences |
| 源URL | [http://ir.idsse.ac.cn/handle/183446/8581]  |
| 专题 | 深海科学研究部_深海极端环境模拟研究实验室 |
| 通讯作者 | Chen, Jiangzhi |
| 作者单位 | 1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 2.Univ Oregon, Dept Earth Sci, Eugene, OR 97403 USA |
| 推荐引用方式 GB/T 7714 | Chen, Jiangzhi,Rempel, Alan W.,Mei, Shenghua. A Monte Carlo Model of Gas-Liquid-Hydrate Three-phase Coexistence Constrained by Pore Geometry in Marine Sediments[J]. FRONTIERS IN EARTH SCIENCE,2021,8:12. |
| APA | Chen, Jiangzhi,Rempel, Alan W.,&Mei, Shenghua.(2021).A Monte Carlo Model of Gas-Liquid-Hydrate Three-phase Coexistence Constrained by Pore Geometry in Marine Sediments.FRONTIERS IN EARTH SCIENCE,8,12. |
| MLA | Chen, Jiangzhi,et al."A Monte Carlo Model of Gas-Liquid-Hydrate Three-phase Coexistence Constrained by Pore Geometry in Marine Sediments".FRONTIERS IN EARTH SCIENCE 8(2021):12. |
入库方式： OAI收割
来源：深海科学与工程研究所
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