气候变化领域集成服务门户(CCPortal): A Shallow Seabed Dynamic Gas Hydrate System off SW Taiwan: Results From 3-D Seismic, Thermal, and Fluid Migration Analyses

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DOI	10.1029/2019JB019245
	A Shallow Seabed Dynamic Gas Hydrate System off SW Taiwan: Results From 3-D Seismic, Thermal, and Fluid Migration Analyses
	Kunath P.; Chi W.-C.; Berndt C.; Chen L.; Liu C.-S.; Kläschen D.; Muff S.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Large amounts of methane, a potent greenhouse gas, are stored in hydrates beneath the seafloor. Sea level changes can trigger massive methane release into the ocean. It is not clear, however, whether surficial seafloor processes can cause comparable discharge. Previously, fluid migration was difficult to study due to a lack of spatially dense seismic and thermal observations. Here we examine a gas hydrate site at Four-Way-Closure Ridge off SW Taiwan using a high-resolution 3-D seismic cube, together with bottom-simulating reflections (BSRs) mapped in the cube, a thermal probe data set, and 3-D thermal modeling results. We document, on a scale of tens of meters, the interaction between surficial sedimentary processes, fluid flow, and a dynamic gas hydrate system. Fluid migrates upward through dipping permeable strata in the limb, the slope basin, and along thrust faults and ridge-top normal faults. The seismic data also reveal several double BSRs that underlie seabed sedimentary sliding and depositional features. Abrupt changes in subsurface pressure and temperature due to the rapid seabed sedimentary processes can cause a rapid shift of the base of the gas hydrate stability zone. This shift may be either downward or upward and would result in the accumulation or dissociation of hydrate in sediments sandwiched by the double BSRs, respectively. We propose that dynamic surficial processes on the seafloor together with shallow focused fluid flow affect hydrate distribution and saturation at depth and may even result in methane expulsion into the ocean if such localized features are common along convergent plate boundaries. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	3-D seismic; fluid migration; gas hydrate; methane emissions; Taiwan; thermal modeling
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/187495
作者单位	Institute of Oceanography, National Taiwan University, Taipei, Taiwan; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Helmholtz Centre for Ocean Research Kiel, GEOMAR, Kiel, Germany; Marine Science and Information Research Center, National Academy of Marine Research, Kaohsiung, Taiwan; Ocean Center, National Taiwan University, Taipei, Taiwan
推荐引用方式 GB/T 7714	Kunath P.,Chi W.-C.,Berndt C.,et al. A Shallow Seabed Dynamic Gas Hydrate System off SW Taiwan: Results From 3-D Seismic, Thermal, and Fluid Migration Analyses[J],2020,125(11).
APA	Kunath P..,Chi W.-C..,Berndt C..,Chen L..,Liu C.-S..,...&Muff S..(2020).A Shallow Seabed Dynamic Gas Hydrate System off SW Taiwan: Results From 3-D Seismic, Thermal, and Fluid Migration Analyses.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Kunath P.,et al."A Shallow Seabed Dynamic Gas Hydrate System off SW Taiwan: Results From 3-D Seismic, Thermal, and Fluid Migration Analyses".Journal of Geophysical Research: Solid Earth 125.11(2020).