Article
Energy & Fuels
Xiao-Yan Li, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Heng-Qi Hu
Summary: The formation of gas hydrate in deposit is predominantly determined by the mass transport rate, while the heat transfer mainly affects the dissociation of methane hydrate. The critical hydrate saturation, defined as 50-80% of the initial hydrate saturation, plays a significant role in gas hydrate resource prospecting and production risk assessment.
Article
Geosciences, Multidisciplinary
Jane A. Rudebusch, Nancy G. Prouty, James E. Conrad, Janet T. Watt, Jared W. Kluesner, Jenna C. Hill, Nathaniel C. Miller, Sally J. Watson, Jess I. T. Hillman
Summary: Previous studies suggest a link between current ocean warming, hydrate dissociation, and methane emissions along the Cascadia Subduction Zone. However, this connection may not consider regional geologic and structural complexities driving methane seepage. By expanding the seep database and conducting spatial and statistical analyses, this study reveals non-random distribution patterns of seeps, occurring in canyons and topographic highs instead of the landward limit of the gas hydrate stability zone. The findings suggest a primary structural control on seep distribution, particularly related to the location of the outer arc high and the landward limit of the gas hydrate stability zone.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Mengdi Pan, Manja Luzi-Helbing, Judith M. Schicks
Summary: Natural gas hydrates are crystalline solids composed of water and gas molecules. The structure and composition of these hydrates vary depending on the source of the gas. Recent studies have reported the existence of coexisting hydrate phases with different structures and compositions in natural gas hydrate reservoirs. Raman spectroscopy analysis showed fluctuations in cage occupancy and composition within individual crystals, but no evidence of coexisting phases. Experimental results indicated that coexisting phases may form when an initial methane hydrate phase reacts with a mixture.
Article
Ecology
Taiki Katayama, Hideyoshi Yoshioka, Masanori Kaneko, Miki Amo, Tetsuya Fujii, Hiroshi A. Takahashi, Satoshi Yoshida, Susumu Sakata
Summary: This study reveals the presence of potential methanogenic activity and living methanogens in hydrate-bearing sediments from the eastern Nankai Trough. Hydrogenotrophic methanogens were found to be dominant, followed by methylotrophic methanogens. The study also observed a sudden decline in methane production rate at temperatures above 40 degrees Celsius.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: The characteristics of hydrate-bearing sediments make the production of natural gas hydrates difficult. This study investigated sand production behaviors in methane hydrate reservoirs with different particle size quartz sands and found that particle size has an impact on particle migration.
Article
Energy & Fuels
Ya-Ting Xu, Yi Wang, Xiao-Sen Li, Xiao-Yan Li, Gang Li, Fu-Cheng Deng
Summary: This study investigates the sand production behaviors in methane hydrate reservoirs with different particle size quartz sands through experiments and analysis. The relationship between the particle size and reservoir damage is also explored. The experimental results show that there is a certain particle size that is beneficial for particle migration, and the reservoir particle size is positively correlated with the amount of sand production. Moreover, based on the different particle sizes, optimization recommendations for the wellbore position are proposed to avoid sand production.
Article
Energy & Fuels
Man Huang, Zhirui Zhao, Dongchao Su, Lianghong Wu, Fanfan Qin, Meixia Zhang, Fulong Ning
Summary: To improve gas production in natural gas hydrate (NGH) reservoirs, a new method called radial water jet slotting and grouting (RWJSG) was proposed. A 3D gas production model based on the NGH reservoir in the South China Sea was constructed to evaluate the effectiveness of RWJSG. The results showed that RWJSG can effectively enhance gas recovery, with significant increases in hydrate dissociation efficiency, cumulative gas production, and gas to water production ratio.
Article
Energy & Fuels
Peng Wu, Shenghua Yang, Xiangge Song, Xiang Sun, Yanghui Li
Summary: In this study, it was found that grain size distribution has a significant impact on the physical properties of hydrate-bearing sediment (HBS), affecting pore connectivity, permeability, thermal conductivity, and electrical conductivity. Smaller grain size leads to deteriorated connectivity in pores and throats, decreased permeability, increased thermal conductivity, and decreased electrical conductivity in HBS under the same hydrate saturation.
Article
Geosciences, Multidisciplinary
Anna P. M. Michel, Victoria L. Preston, Kristen E. Fauria, David P. Nicholson
Summary: The research demonstrates a combined technological approach to investigate methane transport at two shallow seep sites on the Cascadia Margin, showing that methane reaches the air-sea interface and is emitted into the atmosphere.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Myriam Kars, Annika Greve, Lilly Zerbst
Summary: Authigenic ferrimagnetic iron sulfides, particularly greigite, are commonly found in gas hydrate-bearing marine sediments of active accretionary prisms. This study at Site U1518 aims to document rock magnetic properties and magnetic mineral composition, revealing high remanent coercivity and single-domain greigite patterns in most samples. The widespread distribution of greigite at this site is associated with methane diffusion and methane hydrate, with enhanced microbial activity likely favoring the formation and preservation of greigite in certain intervals. The close linkage between greigite, methane hydrate, and microbial activity is highlighted at the Hikurangi Margin.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Engineering, Marine
Xuyang Guo, Yan Jin, Jingyu Zi, Jiaying Lin, Bolong Zhu, Qian Wen, Qi Jing
Summary: Sand production is a significant challenge in the exploitation of methane hydrates, affecting gas productivity. This study presents a numerical model that describes the coupled thermal-hydraulic-mechanical-chemical responses and sand production patterns during horizontal well depressurization in methane-hydrate-bearing sediments. The results show the spatial and temporal evolution patterns of multi-physical fields and highlight the sensitivity of gas and sand production rates to various parameters.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Sijia Wang, Zucheng Cheng, Qingbin Liu, Pengfei Lv, Junchen Lv, Lanlan Jiang, Yongchen Song
Summary: This study investigated the microscale mechanism of hydrate formation and dissociation, identifying different crystal structures and local reformation during the dissociation process. The findings provide insights into the phase transition of hydrates and efficiency of methane hydrate dissociation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Energy & Fuels
Youhai Zhu, Pingkang Wang, Shouji Pang, Shuai Zhang, Rui Xiao
Summary: China has been focusing on the research and development of natural gas hydrate resources, with multiple hydrate accumulations discovered in regions such as the South China Sea, East China Sea, and Qinghai-Tibet Plateau. The estimated total reserve of natural gas hydrates in China is 131.1 trillion cubic meters. Since 2011, China has conducted five successful field tests of gas hydrates, with commercial production expected to begin in the 2030s.
Article
Geosciences, Multidisciplinary
Yann Marcon, Miriam Roemer, Martin Scherwath, Michael Riedel, Knut Ola Dolven, Martin Heesemann
Summary: This study found that seabed methane gas emissions are influenced by the diurnal and semi-diurnal tides, but tides alone are not enough to stop the emissions. The study also showed that the tides do not seem to modulate the vigor of active gas emissions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Physical
Zhi Li, Yue Zhang, Yimao Shen, Xiaodeng Yang, Tianduo Li, Guangjin Chen
Summary: This study synthesized chitosan derivatives with different hydrophilic/hydrophobic properties and compared them with carboxymethyl chitosan derivatives to investigate their relationship with methane hydrate. The experimental results showed that the inhibitory effects of chitosan derivatives were significantly better than carboxymethyl chitosan derivatives. The length and properties of the chitosan derivatives' branched chains played a vital role in hydrate inhibition. Gas-induced agitation provided insights into the hydrate inhibition mechanism of chitosan derivatives.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Environmental Sciences
Meilian Chen, Ji-Hoon Kim, Sungwook Hong, Yun Kyung Lee, Moo Hee Kang, Young Keun Jin, Jin Hur
Summary: The study revealed higher levels of terrestrial inputs and glaciofluvial runoffs in the Arctic fjords, especially in the southern Hornsund fjord. Extremely high levels of protein-like fluorescence were observed in summer at partially sea ice-covered fjords, consistent with near-ubiquity ice-edge blooms observed in the Arctic.
Article
Geochemistry & Geophysics
Weiqi Yao, Stefan Markovic, Adina Paytan, Andrea M. Erhardt, Ulrich G. Wortmann
Summary: The study explores the role of biogeochemical sulfur cycling during the Eocene-Oligocene transition, reporting a decline in seawater sulfate isotope values. Quantitative modeling suggests a significant reoxidation of sulfide from shelf sediments, affecting marine pH and alkalinity. The numbers are similar in magnitude to those observed during Pleistocene glaciations.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Ji-Hoon Kim, Wei-Li Hong, Marta E. Torres, Jong-Sik Ryu, Moo-Hee Kang, Dukki Han, Seung-Il Nam, Jin Hur, Dong-Chan Koh, Frank Niessen, Dong-Hun Lee, Kwangchul Jang, James William Buchanan Rae, Meilian Chen
Summary: The study reveals the presence of a meteoric subsurface flow enriched in cations, radiogenic strontium, and methane in the Chukchi Sea Shelf, likely originating from the degradation of permafrost. The data suggest that this subsurface flow most likely occurred during the Early Holocene Thermal Maximum, at least several thousand years ago.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Karsten Gohl, Gabriele Uenzelmann-Neben, Johanna Gille-Petzoldt, Claus-Dieter Hillenbrand, Johann P. Klages, Steven M. Bohaty, Sandra Passchier, Thomas Frederichs, Julia S. Wellner, Rachel Lamb, German Leitchenkov
Summary: The major ice loss in the Amundsen Sea sector of the West Antarctic Ice Sheet is believed to have caused ice sheet collapses in warm periods like the Pliocene. Expedition 379 recovered sediments from late Miocene to Holocene, providing insights into sedimentation processes in response to climate changes. Analysis of seismic data revealed significant prograding sequences and prolonged ice-sheet retreat during a warm period in the mid-Pliocene, suggesting a highly dynamic West Antarctic Ice Sheet during the Pliocene.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Dong-Hun Lee, Jung-Hyun Kim, Yung Mi Lee, Ji-Hoon Kim, Young Keun Jin, Charles Paull, Jong-Sik Ryu, Kyung-Hoon Shin
Summary: The study revealed distinct differences in geochemical properties and microbial characteristics between two siboglinid tubeworm habitats (ST1 and ST2) in the Canadian Beaufort Sea, with ST1 showing higher methane flux and a higher proportion of DIC derived from anaerobic methane oxidation than ST2. Additionally, both ST1 and ST2 sites exhibited dominance of anaerobic methanotrophic archaea (ANME)-3 and abundant AOM-related byproducts, suggesting their importance as an energy source for tubeworms during chemosynthetic metabolism.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Hye-Bin Choi, Hyoun Soo Lim, Young-Jun Yoon, Ji-Hoon Kim, Ok-Sun Kim, Ho Il Yoon, Jong-Sik Ryu
Summary: Lead sources in plant communities in King George Island are mainly from leaded gasoline and chemical weathering, with a minor contribution from Patagonian aeolian dust.
GEOSCIENCES JOURNAL
(2022)
Article
Environmental Sciences
Wonjung Choi, Joonseop Lee, Young-Gyun Kim, Hanwoong Kim, Tae Siek Rhee, Young Keun Jin, Ji-Hoon Kim, Yongwon Seo
Summary: This study investigated the thermodynamic and structural characteristics of NGHs retrieved from the Chukchi Sea, finding that NGHs from AM03 and AM06 were almost identical in composition, structure, and environment. An abnormal salinity enrichment in the sediment of AM06 was discovered, which may induce the dissociation of NGHs at a lower temperature.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Xuan-Yu Chen, Simon P. E. Blockley, Rebecca Fletcher, Shuang Zhang, Ji-Hoon Kim, Myong-Ho Park, Cong Chen, Jian Yin, Yi-Gang Xu
Summary: Researchers reconstructed the eruptive history and dispersal of volcanoes in East Asia using cryptotephra records preserved in a marine core. They identified six widespread tephra layers and correlated them to their source volcanoes in South Korea, China/North Korea, and Japan, updating their dispersal ranges. The study found that the marine core provides the most intensively tephra-constrained Holocene record in the East Sea, allowing for synchronization with records in other regions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
M. E. Torres, K. L. Milliken, A. Hupers, J. -H. Kim, S. -G. Lee
Summary: Through the analysis of geochemical and petrographic data from the Nicobar Fan, it is found that extensive marine silicate weathering occurs in the input sediment of the Sumatra subduction zone. This weathering leads to the formation of authigenic carbonate, which sequesters carbon, and authigenic clay, which releases CO2.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Ji-Hoon Kim, Jong-Sik Ryu, Wei-Li Hong, Kwangchul Jang, Young Ji Joo, Damien Lemarchand, Jin Hur, Myong-Ho Park, Meilian Chen, Moo-Hee Kang, Sanghee Park, Seung-Il Nam, Yun Kyung Lee
Summary: Changes in the cryosphere extent can impact the interactions and element budgets of seawater and pore fluids in Arctic fjords. This study presents the chemical and isotopic compositions of seawater and pore fluids from five fjords in the Svalbard archipelago, revealing the influence of freshwater discharge and interactions with bedrock on the hydrogeochemical properties of each fjord.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ji-Hoon Kim, Myong-Ho Park, Dong-Hun Lee, Hirotsugu Minami, Young-Keun Jin, Akihiro Hachikubo, Jin Hur, Jong-Sik Ryu, Moo-Hee Kang, Kwangchul Jang, Masato Kida, Yongwon Seo, Meilian Chen, Jong Kuk Hong, Yungoo Song, Sanghee Park
Summary: We investigated the impact of methane seepage on the pore fluid and methane-derived authigenic carbonate (MDAC) chemistry in the ARAON Mounds in the Chukchi Sea. Our findings show that the high methane flux and related byproducts significantly alter the fluid chemistry and physical properties of the sediment columns. This research improves our understanding and prediction of pore fluid and MDAC chemistry in the Arctic Ocean, particularly in relation to methane seepage caused by global climate change.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Jong-Sik Ryu, Hyoun Soo Lim, Hye-Bin Choi, Ji-Hoon Kim, Ok-Sun Kim, Nathalie Vigier
Summary: This study investigates the elemental and Li isotope geochemistry of meltwaters, suspended sediments, soils, and bedrocks in the Barton Peninsula, King George Island, Antarctica. The findings suggest that increasing global surface temperature enhances modern chemical weathering in Antarctica, leading to lower delta Li-7 values in meltwater with intense water-rock interactions.
FRONTIERS IN EARTH SCIENCE
(2022)
Letter
Multidisciplinary Sciences
Weiqi Yao, Ulrich G. Wortmann
Summary: The melting of glaciers triggered volcanic activities, resulting in oxygen-deprived waters in the northeastern Pacific Ocean that lasted for thousands of years.
Article
Geography, Physical
Ji-Woong Yang, Jinho Ahn, Go Iwahana, Nayeon Ko, Ji-Hoon Kim, Kyungmin Kim, Alexander Fedorov, Sangyoung Han
Summary: Permafrost thawing due to global warming can lead to the release of greenhouse gases, which contributes to further warming. The control mechanisms of greenhouse gases in permafrost ground ice are not fully understood. This study presents new data on CO2, CH4, and N2O in ice wedges in Siberia, revealing a correlation between CH4 and N2O mixing ratios. Microbial metabolism may play a significant role in the observed greenhouse gas patterns.
PERMAFROST AND PERIGLACIAL PROCESSES
(2023)
Article
Engineering, Environmental
Dugin Kaown, Dong-Chan Koh, Bernhard Mayer, Juergen Mahlknecht, YeoJin Ju, Sung-Keun Rhee, Ji-Hoon Kim, Dong Kyu Park, Inwoo Park, Hye-Lim Lee, Yoon Yeol Yoon, Kang-Kun Lee
Summary: This study investigated the sources of nutrients and the effects of groundwater-surface water interactions on nutrient variation in a large river in South Korea. The results showed that manure and sewage contributed significantly to groundwater nitrate, as well as nitrate in surface water. The findings also revealed that the occurrence of cyanobacterial blooms in the river during the wet season was governed by the increased contributions of groundwater carrying manure-derived nutrients. The integrated approach using multiple isotopes and microbiological data proved to be highly effective in evaluating nutrient sources and delineating hydrological interactions between groundwater and surface water.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)