Article
Geosciences, Multidisciplinary
Zhiqi Guo, Xueying Wang, Jian Jiao, Haifeng Chen
Summary: A rock physics model was established to calculate the P-wave velocity dispersion and attenuation caused by the squirt flow of fluids in gas hydrate-bearing sediments. Seismic modeling results show the impact of gas hydrate saturation on reflection responses under different modes, indicating notable changes in seismic responses with increasing gas hydrate saturation.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Yichuan Wang, Heather Bedle, Kurt J. Marfurt
Summary: Gas hydrate deposits on continental margins have gained global attention. While the bottom-simulating reflector (BSR) is commonly used as an indicator for gas hydrate presence, it is insufficient for identifying and quantifying the hydrates. Therefore, measuring seismic stratigraphic and attenuation attributes is a useful method for characterizing gas hydrates. This approach allows the identification of short-scale layering patterns that provide information about the amount and mechanism of gas hydrates. By using sparse strongest peaks and attenuation parameters Q(-1) and gamma, complete time-variant spectra and spectral differences at different times can be measured. The obtained results from seismic data over the Hikurangi and Gondwana margins in eastern New Zealand show high-quality spectral and attenuation images that correlate with BSRs and provide insights into free-gas and gas-hydrate accumulations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
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)
Review
Energy & Fuels
Xiaokun Hou, Shengwen Qi, Xiaolin Huang, Songfeng Guo, Yu Zou, Lina Ma, Linxin Zhang
Summary: This paper critically synthesizes the information on the hydrate morphology and mechanical behavior of hydrate-bearing sediment (HBS) to facilitate its application in engineering practice and guide future investigations. The study focuses on the relationship between mechanical parameters and hydrate saturation in HBS synthesized using different methods, and establishes a conceptual model reflecting the particle-level failure mechanism. Additionally, the creep behavior, constitutive models, and mechanical response during hydrate dissociation are summarized and discussed.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Energy & Fuels
Thi Xiu Le, Michel Bornert, Ross Brown, Patrick Aimedieu, Daniel Broseta, Baptiste Chabot, Andrew King, Anh Minh Tang
Summary: This study used high-resolution optical microscopy and synchrotron X-ray computed tomography to observe methane hydrate growth in marine sandy sediments, revealing previously unidentified features such as hollow filaments and Haines jumps. These techniques allowed for detailed observations at spatial scales below the pore size and temporal scales below 1 s, providing valuable insights into the growth processes of methane hydrate.
Article
Thermodynamics
Rui Xu, Xuan Kou, Tian-Wei Wu, Xiao-Sen Li, Yi Wang
Summary: This study used microfluidic chips and employed two perturbation methods to disrupt the metastable state and achieve the formation of methane hydrates. The results showed that in microfluidic chips, formation of hydrates requires phase equilibrium state and perturbation in the regions with crystal nuclei. Perturbation caused by constant pressure flow in the random pore structure was found to be the most effective method. The repeated movement of methane-water phase played a significant role in the hydrate reformation process.
Article
Geochemistry & Geophysics
Pan HaoJie, Li YongGen, Wei Chao, Gui ZhiXian, Li XiaoMing, Zhang Xiang, Zhao Yi, Zhang Wei
Summary: Due to the complex hydrate morphologies, existing models cannot accurately describe hydrate reservoirs. We establish a rock physics model considering multiple hydrate morphologies to improve the accuracy of hydrate saturation estimate. Numerical simulation and experimental validation show that the model can capture acoustic responses of hydrate samples and reveal hydrate occurrence mechanism and evolution pattern.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2022)
Article
Geosciences, Multidisciplinary
Tao Liu, Xueyang Bao, Junxin Guo
Summary: Understanding the attenuation mechanism in gas hydrate-bearing sediments is crucial for accurately quantifying natural gas hydrates. Previous models fail to explain the observed attenuation suppression in fracture-filling gas hydrates, but this study presents a new model that successfully reproduces the suppressed attenuation and shows promise for detection and quantification of gas hydrates in clay-dominated sediments using seismic data.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Yumin Zhao, Enhedelihai Alex Nilot, Bei Li, Gang Fang, Wei Luo, Yunyue Elita Li
Summary: By extracting seismic ambient noise from motor vehicle noise, we quantified the linear relationship between frequency and amplitude ratio of paired instantaneous spectra to obtain daily seismic attenuation. After verifying the reliability of the method, it was applied to seismic ambient noise data collected from three urban sites. The estimated attenuation was compared with three environmental variables: rainfall, temperature, and traffic volume. The results showed a strong correlation between estimated seismic attenuation and precipitation, indicating a high sensitivity to changes in soil moisture and groundwater system.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Ocean
Jitao Xu, Haitao Zhu, Mingjing Jiang, Wenhao Li, Shijie Zhang, Xiaodong Chang
Summary: This article investigates the stability and reliability of marine slopes considering the impact of hydrate decomposition and earthquakes. The analysis reveals that the safety factor of slopes with a 30% potential for damage is around 1.25. The proposed method can effectively provide early warning for the collapse of marine hydrate-bearing slopes.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Sourav K. Sahoo, Angus Best
Summary: Direct estimates of permeability in hydrate-bearing geological formations can be obtained from remote measurements of shear wave velocity and attenuation. By incorporating changes in permeability related to hydrate morphology, the models are able to describe the observed data effectively. The study demonstrates the general applicability of the models by comparing with shear wave data at different frequencies.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Energy & Fuels
Didi Wu, Shuxia Li, Yang Guo, Lu Liu, Zhiqiang Wang
Summary: A novel model of effective thermal conductivity for gas hydrate-bearing sediments was developed in this study, which accurately captures the thermal conductivity characteristics and considers the influence of hydrate morphology.
Article
Energy & Fuels
Hao-Yang Li, Xiao-Sen Li, Yi-Song Yu, Zhao-Yang Chen
Summary: In this study, the morphologies of methane hydrate formation in a system containing different mole ratios of tetrahydrofuran (THF) and cyclopentane (CP) at two different temperatures were systematically studied. The results showed that a hydrate film quickly formed at the interface between CP and the THF solution phase, significantly decreasing gas-liquid mass transfer efficiency. Interestingly, the hydrate layer broke when the temperature increased. Three stages of hydrate formation were observed in the system at the higher temperature. Furthermore, the type of promoters used in the system had no effect on CH4 occupancy in sII cages after the hydrate layer ruptured.
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
Thermodynamics
Didi Wu, Shuxia Li, Ningtao Zhang, Yang Guo, Lu Liu, Zhiqiang Wang
Summary: In this paper, a novel normalized permeability model was established to capture the dynamic characteristic of permeability in hydrate-bearing sediments. The model was verified and compared with existing models using different published data. Results showed that the proposed model was more powerful and better captured the permeability evolution in hydrate-bearing sediments at various conditions.
Article
Engineering, Civil
Louise Otter, Christopher Robert I. Clayton, Jeffrey A. Priest, Petrus J. Grabe
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2016)
Article
Engineering, Civil
Ali Firat Cabalar, Chris Clayton
PERIODICA POLYTECHNICA-CIVIL ENGINEERING
(2016)
Article
Energy & Fuels
Murad AbuAisha, David Eaton, Jeffrey Priest, Ron Wong
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2017)
Article
Engineering, Civil
Bruno Zuada Coelho, Jeffrey Priest, Paul Holscher
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2018)
Article
Engineering, Geological
B. N. Madhusudhan, M. A. Clare, C. R. I. Clayton, J. E. Hunt
QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
(2017)
Article
Engineering, Geological
Amit Sultaniya, Jeffrey A. Priest, C. R. Clayton
CANADIAN GEOTECHNICAL JOURNAL
(2018)
Article
Engineering, Geological
William E. Smith, Jeffrey A. Priest, Jocelyn L. H. Hayley
CANADIAN GEOTECHNICAL JOURNAL
(2018)
Article
Engineering, Geological
Anna Mamou, Jeffrey A. Priest, Christopher R. I. Clayton, William Powrie
CANADIAN GEOTECHNICAL JOURNAL
(2018)
Article
Geosciences, Multidisciplinary
Jeffrey A. Priest, Jocelyn L. Hayley, William E. Smith, Peter Schultheiss, John Roberts
MARINE AND PETROLEUM GEOLOGY
(2019)
Article
Geochemistry & Geophysics
Murad AbuAisha, David Eaton, Jeffrey Priest, Ron Wong, Benjamin Loret, Alana H. Kent
JOURNAL OF SEISMOLOGY
(2019)
Article
Geochemistry & Geophysics
B. N. Madhusudhan, C. R. I. Clayton, J. A. Priest
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Energy & Fuels
Mandeep R. Pandey, Jeffrey A. Priest, Jocelyn L. Hayley
Summary: Determining the geomechanical properties of hydrate-bearing sands is crucial for evaluating the potential for methane gas recovery. The results of laboratory studies have shown that factors such as hydrate saturation and formation method influence strength and stiffness, with particle size distribution also playing a significant role. Understanding these relationships can aid in the development of efficient methane gas production methods.
Proceedings Paper
Engineering, Civil
L. Rorke, S. Tripathy, L. Otter, C. R. I. Clayton, W. Powrie
PROCEEDINGS OF THE FIRST SOUTHERN AFRICAN GEOTECHNICAL CONFERENCE
(2016)
Proceedings Paper
Geosciences, Multidisciplinary
Jeffrey A. Priest, Jocelyn L. H. Grozic
SUBMARINE MASS MOVEMENTS AND THEIR CONSEQUENCES
(2016)
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)