气候变化领域集成服务门户(CCPortal): Methane Hydrate Formation and Evolution During Sedimentation

CCPortal

DOI	10.1029/2020JB021235
	Methane Hydrate Formation and Evolution During Sedimentation
	You K.; Flemings P.B.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	We explored methane hydrate formation with sedimentation with a newly developed one-dimensional, multiphase flow, multicomponent transport numerical model. Our model couples methane hydrate formation from in situ microbial methane generation within the hydrate stability zone (HSZ), methane recycling, and microbial methane generation below the base of the hydrate stability zone (BHSZ). Both recycled methane and deeply generated methane are transported into the HSZ by buoyancy-driven free gas flow. Free gas flows through the HSZ by both the processes of capillary-dependent pore fillings and by salt exclusion during hydrate formation, with the former being the dominant mechanism. We quantitively illustrated the formation of enriched hydrate in muddy sediments above, and interconnected free gas below, the BHSZ, which are common features along the world's continental margin. In addition, we showed two ways to form concentrated methane hydrate above the BHSZ. The first mechanism is local free gas flow during methane recycling. This happens at sites with sufficient methane generation above the BHSZ. The second mechanism is deep microbial methane generation which is transported into the HSZ by free gas flow. This mechanism plays a more important role at sites with high sedimentation rates. This study provides new insights into methane hydrate formation and distribution below the seafloor. It is important for understanding the carbon cycle and carbon storage below the seafloor and for resource evaluation and exploitation. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	bottom simulating reflector; capillary effect; free gas flow; methane recycling; sedimentation; three-phase equilibrium
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187225
作者单位	Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, Jackson of Geosciences, University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	You K.,Flemings P.B.. Methane Hydrate Formation and Evolution During Sedimentation[J],2021,126(4).
APA	You K.,&Flemings P.B..(2021).Methane Hydrate Formation and Evolution During Sedimentation.Journal of Geophysical Research: Solid Earth,126(4).
MLA	You K.,et al."Methane Hydrate Formation and Evolution During Sedimentation".Journal of Geophysical Research: Solid Earth 126.4(2021).