Article
Engineering, Chemical
Zheng Liu, Baojiang Sun, Zhiyuan Wang, Litao Chen, Xiaohui Sun
Summary: Submarine gas seepage is a common process. This study developed a mechanistic model to simulate bubble transport inside and outside the gas hydrate stability zone. The results suggest that solid hydrates can effectively prevent bubble dissolution and the majority of released gases are absorbed by the shallow oceanic layer.
Article
Geosciences, Multidisciplinary
Akihiro Hiruta, Ryo Matsumoto
Summary: The collection of microbial CH4 hydrates and methane-derived authigenic carbonates has increased around Sado Island in the Sea of Japan. This study compares the carbon isotopic composition of CaCO3 in these areas to that observed in thermogenic CH4 hydrate mounds offshore of Joetsu. The variations in carbon isotopes suggest differences in past geochemical dynamics and a possible link with deep oil and gas reservoirs.
Article
Energy & Fuels
Xin-Yang Zeng, Jing-Chun Feng, Wei Ke, Jiang Wang, Si Zhang, Yan Xie
Summary: The study explores the effect of hydrate inhibitors on the morphological evolution of hydrate growth, specifically focusing on the growth kinetics of methane-propane hydrate film. The results indicate that the inhibitors play a crucial role in inhibiting hydrate growth, with the hydrate film acting as a mass transfer barrier. The research also highlights the importance of environmental factors, such as subcooling and inhibitor concentration, in determining the growth rate and morphology of the hydrate film. This study provides valuable insights for effectively inhibiting hydrate growth and ensuring multiphase flow in deep sea oil & gas transportation.
Article
Geosciences, Multidisciplinary
Kun Zhang, Haibin Song, Shaoqin Sun, Jinyao Gao
Summary: Submarine landslides in the northeastern South China Sea were investigated using multi-channel seismic and topographic data. The study revealed that most landslides are small in size and developed in regions with small slope gradients. The distribution of submarine landslides correlates with bottom simulating reflections (BSRs) and seabed activities, suggesting possible interrelations among them.
GEOLOGICAL JOURNAL
(2021)
Review
Engineering, Marine
Jingyi Chang, Yuanyuan Li, Hailong Lu
Summary: This review summarizes the methods used for the morphological study of pyrite and discusses the significance of the textural and size characteristics of euhedral pyrite and pyrite aggregates in reconstructing the geochemical environment. The study includes shape observation, size estimation, and surface feature analysis, using various microscopy techniques. The findings suggest that different formation mechanisms and geochemical environments correspond to specific textures in pyrite.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jing-Chun Feng, Can-Rong Li, Li Tang, Xiao-Nan Wu, Yi Wang, Zhifeng Yang, Weiyu Yuan, Liwei Sun, Weiqiang Hu, Si Zhang
Summary: Microplastic pollution poses a major threat to marine ecosystems. This study demonstrates the deposition of microplastics in the Haima cold seep since the invention of plastics. It is found that the burial rates of microplastics significantly increased in non-seepage areas, but were lower in methane seepage areas, suggesting the degradation potential of microplastics in cold seeps.
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
Energy & Fuels
Shicai Sun, Zhendong Yang, Linlin Gu, Haifei Lin, Changxing Zhang
Summary: In this study, a permeability model considering bubbles was developed and applied to the numerical simulation of hydrate dissociation by depressurization. The results show that bubble generation decreases the hydrate dissociation rate and gas-water migration efficiency, along with a decrease in core permeability.
Article
Engineering, Marine
Yufa He, Benjian Song, Qingping Li
Summary: This research explores the geomechanical challenges and risks associated with gas hydrate extraction in submarine slope zones. It found that hydrate decomposition during drilling has minimal effect on slope and wellbore deformation, but a year of hydrate production can cause significant displacement and increase the risk of submarine landslides. The study emphasizes the need for meticulous monitoring of formation subsidence and wellhead equipment displacement. In the aftermath of a hydrate-induced submarine landslide, both the hydrate layer and the overlying strata descend together, causing considerable damage. The findings provide crucial insights for enhancing safety measures in hydrate drilling and production, and ensuring wellbore stability.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Xiong Zhang, Zhendong Luan, Zengfeng Du, Shichuan Xi, Lianfu Li, Chao Lian, Jianxing Zhang, Ziyu Yin, Liang Ma, Xin Zhang
Summary: This study used an integrated in-situ long-term observation platform to monitor seep venting activity and associated chemosynthetic communities in the Formosa Ridge of the South China Sea. It found that gas hydrates are formed during cold seep venting, interspersed with periods of hydrate decomposition during non-active intervals. The methane concentration and biological cover in chemosynthetic communities exhibited stability.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Ellen Lalk, Thomas Pape, Danielle S. Gruen, Norbert Kaul, Jennifer S. Karolewski, Gerhard Bohrmann, Shuhei Ono
Summary: This study investigates submarine gas hydrate deposits from different regions of the world's oceans using isotope analysis, providing insights into the source and generation depth of methane. The findings suggest that the isotopic composition of methane can provide information about microbial and thermogenic sources, and the apparent temperature can be used to infer the depth of methane generation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geosciences, Multidisciplinary
Haoyi Yao, Giuliana Panieri, Moritz F. Lehmann, Tobias Himmler, Helge Niemann
Summary: Current activities of cold seeps in the ocean can be observed directly through methane emissions from the seafloor, presence of chemosynthetic organisms, and high gas concentrations in sediment pore waters and the water column. Past activities can be reconstructed through proxy records of authigenic seep carbonates, which indicate anaerobic oxidation of methane in the seafloor environment.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Gareth J. Crutchley, Jess I. T. Hillman, Karsten F. Kroeger, Sally J. Watson, Francesco Turco, Joshu J. Mountjoy, Bryan Davy, Susi Woelz
Summary: Sub-seabed fluid flow, gas hydrate accumulation and seafloor methane seepage are closely connected processes that have significant impacts on marine biodiversity, ocean chemistry, and seafloor stability. The study explores the relationship between shallow structural deformation, focused gas migration, and hydrate accumulation using seismic data in the southern Hikurangi subduction wedge. The results reveal variations in the deformation of ridges and the orientation of gas flow structures, highlighting the importance of understanding shallow stress fields in controlling fluid flow patterns and methane seepage.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Shuangmin Duan, Sebastian Hoelz, Anke Dannowski, Katrin Schwalenberg, Marion Jegen
Summary: The Black Sea has extensive indicators of methane hydrates, and marine controlled-source electromagnetics (CSEM) is a suitable method for investigating hydrates. CSEM data collected in the Black Sea reveal resistive layers indicating potential gas hydrate saturations, with comparisons to seismic data and other experiments providing further insights.
MARINE AND PETROLEUM GEOLOGY
(2021)
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
Geosciences, Multidisciplinary
Tingting Wu, Heiko Sahling, Tomas Feseker, Rebecca Rendle-Buehring, Jiangong Wei, Paul Wintersteller, Yann Marcon, Thomas Pape, Miriam Roemer, Gerhard Bohrmann
MARINE AND PETROLEUM GEOLOGY
(2019)
Article
Geology
Daniel Smrzka, Jennifer Zwicker, David Misch, Christoph Walkner, Susanne Gier, Patrick Monien, Gerhard Bohrmann, Joern Peckmann
Article
Multidisciplinary Sciences
Tobias Himmler, Diana Sahy, Tonu Martma, Gerhard Bohrmann, Andreia Plaza-Faverola, Stefan Buenz, Daniel J. Condon, Jochen Knies, Aivo Lepland
Article
Geosciences, Multidisciplinary
Chieh-Wei Hsu, Ian R. MacDonald, Miriam Roemer, Thomas Pape, Heiko Sahling, Paul Wintersteller, Gerhard Bohrmann
GEO-MARINE LETTERS
(2019)
Article
Geochemistry & Geophysics
T. Pape, S. Bunz, W. -L. Hong, M. E. Torres, M. Riedel, G. Panieri, A. Lepland, C. -W. Hsu, P. Wintersteller, K. Wallmann, C. Schmidt, H. Yao, G. Bohrmann
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geosciences, Multidisciplinary
Timo Zander, Matthias Haeckel, Ingo Klaucke, Joerg Bialas, Dirk Klaeschen, Cord Papenberg, Thomas Pape, Christian Berndt, Gerhard Bohrmann
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
M. Riedel, T. Freudenthal, M. Bergenthal, M. Haeckel, K. Wallmann, E. Spangenberg, J. Bialas, G. Bohrmann
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Zoology
Elena M. Krylova, Heiko Sahling
Article
Geosciences, Multidisciplinary
Thomas Pape, Martin Blumenberg, Anja Reitz, Georg Scheeder, Mark Schmidt, Matthias Haeckel, Valentina N. Blinova, Michael K. Ivanov, Heiko Sahling, Klaus Wallmann, Gerhard Bohrmann
Summary: This study identified the likely sources of gas and oil emitted at various seep sites on the continental slope off Georgia in the Eastern Black Sea. The hydrocarbons ascending at these sites are determined to originate from the Eocene Kuma Formation and/or the Oligocene-Lower Miocene Maikop Group, which are considered to be the principal hydrocarbon sources in the region.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Peter Betlem, Srikumar Roy, Thomas Birchall, Andrew Hodson, Riko Noormets, Miriam Roemer, Ragnheid Skogseth, Kim Senger
Summary: This study models the NGH stability zone in Svalbard's fjords and predicts NGH formation potential in most fjords at mean BWT conditions. Active petroleum systems with fluid migration reaching the seafloor are observed in Isfjorden, but the predicted GHSZ across Svalbard's fjords is likely to disappear in the next few decades due to water column warming.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Oceanography
Katrin Linse, Miriam Roemer, Crispin T. S. Little, Yann Marcon, Gerhard Bohrmann
Summary: The Sandwich Plate is a highly active region in terms of tectonic activity in the Southern Ocean and Antarctica, with volcanic islands, submarine volcanic features, seismic activity, and hydrothermal vents. A recent investigation explored potential hydrothermally active sites in different depths, revealing thermal anomalies and chimney structures. However, the benthic habitats and communities of the Sandwich Plate are still poorly understood.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Geosciences, Multidisciplinary
Yiting Tseng, Miriam Roemer, Saulwood Lin, Thomas Pape, Christian Berndt, Tzu-Ting Chen, Charles K. Paull, David W. Caress, Gerhard Bohrmann
Summary: Hydroacoustic surveys in the accretionary wedge southwest of Taiwan identified an active hydrocarbon seepage area known as Yam Seep, covering approximately 49,000 m(2) on the northern crest of the Four-Way Closure Ridge. Data from multibeam and side-scan sonar revealed rugged topography and high seafloor backscatter in the area. Further investigations using video sleds, sediment sampling, and drilling confirmed that the seepage has been ongoing for thousands of years and is characterized by intensely fractured methane-derived carbonates. Gas bubble emission sites were detected in the water column in 2019, indicating the presence of gas hydrates in the subsurface.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)