Article
Geosciences, Multidisciplinary
Linqi Zhu, Shiguo Wu, Xueqing Zhou, Jianchao Cai
Summary: Accurate quantification of gas hydrate content in the deep sea is essential for assessing resource potential and understanding its role in the global carbon cycle. Current methods relying on resistivity logging data and Archie's equation have limitations due to empirical parameter reliability. This study proposes a theory to determine cementation factor and saturation index, and develops a new technique for evaluating complex fine-grained hydrate-bearing reservoirs using well logging data. The results show improved consistency with core hydrate saturation, supporting the need for new saturation estimation methods in future evaluations of hydrate resources in fine-grained sediment reservoirs.
GEOSCIENCE FRONTIERS
(2023)
Article
Astronomy & Astrophysics
N. Tanner Mills, Julia S. Reece, Michael M. Tice, Jason B. Sylvan
Summary: Micro-organisms have an influence on the porosity, permeability, and compressibility of fine-grained sediments, which is dependent on sediment properties, nutrients, and vertical stress. Understanding the effects of micro-organisms on the hydromechanical properties of sediments can contribute to our knowledge of pore pressure control in marine environments and aid in bioclogging practices in terrestrial environments.
EARTH AND SPACE SCIENCE
(2022)
Article
Engineering, Civil
Henning Mohr, Scott Draper, David J. White, Liang Cheng
Summary: Erosion of marine sediments is complex and affected by various soil properties, with permeability playing a crucial role in determining the threshold shear stress. A new model has been introduced to predict the threshold shear stress based on permeability and erosion rate, which has been shown to explain experimental data and align with existing literature. This model is advantageous because it considers changes in bulk soil parameters and their impact on permeability, providing a comprehensive understanding of erosion resistance in different marine sediments.
COASTAL ENGINEERING
(2021)
Article
Energy & Fuels
Xiaojun Zhu, Min Guo, Jingong Cai, Mingshui Song
Summary: The interaction between organic matter and minerals in fine-grained sediments influences the fractionation of hydrocarbon generation, with stronger organic-mineral interactions reducing the geothermal requirement for hydrocarbon generation and advancing the onset timing of hydrocarbon generation.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jiang Zaixing, Kong Xiangxin, Yang Yepeng, Zhang Jianguo, Zhang Yuanfu, Wang Li, Yuan Xiaodong
Summary: This paper systematically discusses the multiple source characteristics and formation mechanisms of carbonate-rich fine-grained sedimentary rocks, highlighting the main reason for the enrichment of fine-grained carbonate materials in rift lake basins as the supply of multiple material sources. It also summarizes the hydrocarbon accumulation characteristics of carbonate-rich fine-grained sedimentary rocks.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Engineering, Marine
Yehuan Wang, Yong Wang, Yanli Wang, Cheng Chen, Lingwei Kong, Mengbing Xu
Summary: Marine sediment serves as a significant pathway for methane leakage from the earth's interior to the atmosphere. Investigating gas invasion in fine-grained marine sediments is crucial in marine science and engineering. Through a gas injection test using a self-developed experimental apparatus, the behavior of gas invasion was studied. The results revealed that gas invasion in fine-grained sediments can be divided into different phases, with the fracturing direction changing from vertical to horizontal before fracturing along the roof. A discrimination criteria of gas invasion considering both tensile and shear failure modes was proposed based on the 2D undrained elliptical cavity model and sediment tensile strength, which showed good agreement with experimental observations.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Geological
Jing-xin Wu, Xiu-jun Guo, Yong-qing Xie, Zhen-chao Zhang, Hao-ru Tang, Zhi-jie Ma, Jun-bing Chen
Summary: This study focused on the risks and evolution of land reclamation in shallow offshore bubble-bearing sediments. Through electrical resistivity tomography and theoretical analysis, it was found that the bubbles in the area were smaller than the critical size for rising, and there was no significant horizontal/vertical evolution of the gas front after land reclamation.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Marine
Ruchun Wei, Lele Liu, Chao Jia, Xiao Dong, Qingtao Bu, Yongchao Zhang, Changling Liu, Nengyou Wu
Summary: This study proposes a prediction model of undrained shear strength of hydrate-bearing fine-grained sediments based on the critical state theory. Consolidated undrained triaxial shear tests are conducted on samples from the Shenhu area of the South China Sea to investigate the effects of consolidation stresses and hydrate saturations on the undrained shear strength. The results show that the undrained shear strength increases with increasing effective consolidation stress and hydrate saturation, and it is a two-parameter function of effective hydrate saturation and void ratio.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Neda Vdovic, Mavro Lucic, Nevenka Mikac, Niko Bacic
Summary: This study compared the distribution of six common metal contaminants in freshwater sediments between bulk and fine fractions, and found significant differences between these two fractions in different environments, suggesting the importance of selecting the appropriate fraction based on sediment characteristics for metal contamination investigation.
Article
Environmental Sciences
Michele Trevisson, Olivier Eiff
Summary: The study investigates the long-term evolution of fine sediment ribbons in rivers and the influence of immobile grains on the erosion process. Through flume experiments, the researchers found that ridges formed by immobile grains are the main sediment source, while troughs are quickly eroded to a stable bed level. The erosion rates over ridges and troughs follow a sequence of four regimes, which are controlled by the height of ridges and the lateral roughness heterogeneity.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Yan He, Changsheng Guo, Jiapei Lv, Yuehua Deng, Jian Xu
Summary: The study conducted in the Liaohe River basin revealed widespread contamination of sediments with insecticides, with pyrethroids being the most dominant. The pollution is likely attributed to sewage and industrial wastewater discharge from nearby cities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geography, Physical
Lianji Liang, Xiufu Qiao, Fuchu Dai, Ning Zhong, Hanchao Jiang
Summary: Soft-sediment deformation structures (SSDSs) are widely developed in lacustrine sediments in tectonically active regions, containing valuable information on regional fault activity. This study identified multiple SSDSs in Late Pleistocene lacustrine sediments in northeastern Pamir, showing deformation mechanisms related to liquefaction, fluidization, and thixotropic behaviors. AMS radiocarbon dating data revealed formation periods of the SSDSs, indicating a possible relation to seismic activities and enhancing understanding of fault activity in the region.
QUATERNARY INTERNATIONAL
(2021)
Article
Computer Science, Artificial Intelligence
Zhicheng Sheng, Liqiang Nie, Meng Liu, Yinwei Wei, Zan Gao
Summary: In this paper, we propose FROND, a method for generating fine-grained talking videos. FROND addresses the challenges of capturing facial expressions, ensuring smooth transitions, and preserving details. Experimental results show that FROND outperforms several state-of-the-art baselines in both quantitative and qualitative evaluations.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2023)
Review
Geosciences, Multidisciplinary
Zhun Zhang, Lele Liu, Wanjun Lu, Changling Liu, Fulong Ning, Sheng Dai
Summary: Commercial development of natural gas hydrate is important for energy structure, energy security, and global climate. Reservoir permeability is a critical parameter for hydrate exploitation and its dependence on various factors is comprehensively discussed. The study highlights the need for effective permeability models and challenges in accurately predicting gas production capacity. Collaborative research and development of agreeable measurement methods are proposed to address the challenges.
EARTH-SCIENCE REVIEWS
(2023)
Article
Engineering, Marine
Di Lu, Qin Tang, Dehuan Yang, Rongtao Yan, Yun Chen, Shuai Tao
Summary: This study measured the stability conditions of methane hydrate in fine-grained sediment with different dry densities and initial water saturations. The results showed that methane hydrate formation in fine-grained sediment required lower temperature and/or higher pressure compared to bulk state. The P-T conditions of methane hydrate in fine-grained sediment with different dry density and initial water saturation deviated significantly from that in pure water. Additionally, NMR analysis revealed that liquid water always distributed in the small sediment pores during formation and dissociation stages.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)