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
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
Pradeep Kumar Shukla, David Lall, Vikram Vishal
Summary: Pore pressure is a crucial and dynamic parameter in reservoir geomechanics, and accurate prediction of it using petrophysical logging data and machine learning techniques can reduce drilling risks and improve wellbore stability.
NATURAL RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Jin Qian, Dongju Kang, Jiapeng Jin, Lin Lin, Yiqun Guo, Mianmo Meng, Zhaoqi Wang, Xiujuan Wang
Summary: This study evaluates the gas hydrate-bearing layer and the underlying free gas-bearing layer in the Shenhu area of the South China Sea using quantitative seismic characterization. The results provide a reliable method for characterizing gas hydrate-bearing sediments in areas with no wells and for assessing the potential danger of free gas before drilling.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Thermodynamics
Bao-Can Dong, Peng Xiao, Yi-Fei Sun, Jing-Yu Kan, Ming-Ke Yang, Xiao-Wan Peng, Chang-Yu Sun, Guang-Jin Chen
Summary: This study analyzed the evolution and geological stability of hydrate deposits in the South China Sea during depressurization using a numerical model. The analysis also determined the gas-water production. The findings provide important insights for the exploitation of marine heterogeneous hydrates.
Article
Multidisciplinary Sciences
Liang Lei, Taehyung Park, Karl Jarvis, Lingli Pan, Imgenur Tepecik, Yumeng Zhao, Zhuan Ge, Jeong-Hoon Choi, Xuerui Gai, Sergio Andres Galindo-Torres, Ray Boswell, Sheng Dai, Yongkoo Seol
Summary: This article presents the first pore-scale micro-CT study of natural hydrate-bearing cores, revealing that gas hydrate in the Gulf of Mexico is pore-invasive and can form a connected 3D network, providing mechanical support for sediments.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Xuan Kou, Jing-Chun Feng, Xiao-Sen Li, Yi Wang, Zhao -Yang Chen
Summary: This work aims to reveal the unaddressed formation mechanism of heterogeneous hydrate-bearing sediments (HBS) by theoretical hypothesis, model derivation, and experimental verification. The proposed kinetic model successfully predicts the formation rates of different heterogeneous HBS, and the X-ray Computed Tomography (X-CT) scans confirm the hypotheses about water migration and heterogeneous hydrate distribution. The findings provide theoretical support and research method for efficient exploitation of naturally occurring heterogeneous HBS.
Article
Engineering, Marine
Qiaobo Hu, Yanlong Li, Nengyou Wu, Jiaxin Sun, Qiang Chen, Xiaofeng Sun
Summary: This study conducts creep tests on hydrate-bearing sediments (HBS) and proposes a modified creep model to describe the creep behavior and long-term strength decay of HBS. The results show that the creep deformation of HBS is enhanced with the decrease in hydrate saturation, and the long-term strength decays linearly with decreasing hydrate saturation and effective confining pressure. The proposed model can describe the whole failure process, especially the accelerated creep stage. The findings have implications for predicting the nonlinear failure behaviors of the reservoir during long-term natural gas hydrate mining.
Article
Thermodynamics
Yuqi Wu, Pejman Tahmasebi, Keyu Liu, Chengyan Lin, Serveh Kamrava, Shengbiao Liu, Samuel Fagbemi, Chang Liu, Rukuai Chai, Senyou An
Summary: This study proposes a novel hybrid modeling approach integrating X-ray CT imaging technology, morphological operation algorithm, and quartet structure generation set method to investigate the dependence of the physical properties of hydrate-bearing sediments (HBS) on hydrate occurrence patterns and saturation levels. The findings suggest that different hydrate types have varying heterogeneity in the distribution of pore and throat radii.
Article
Energy & Fuels
Jianchun Xu, Ziwei Bu, Hangyu Li, Shuxia Li, Baojiang Sun
Summary: Gas hydrate exploitation involves complex physical and chemical processes, and its permeability plays a significant role in fluid flow. The study reveals the impact of hydrate on pore structure and permeability, showing that the permeability changes with hydrate saturation. Pore-scale simulation experiments analyze the effects of factors such as skeleton grain and hydrate distribution on permeability variation.
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
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
Geosciences, Multidisciplinary
Yi Fang, Peter B. Flemings, John T. Germaine, Hugh Daigle, Stephen C. Phillips, Josh O'Connell
Summary: This experimental study investigates the properties of porosity, compressibility, and the ratio of horizontal to vertical effective stress in hydrate-bearing sandy silts. The results show that the hydrate-bearing sediments are stiffer than the hydrate-free sediments, and have a greater stress ratio. The porosity decreases when the hydrate is dissociated, indicating its role in the compaction of the sediments. The presence of hydrate also affects the lateral stress and stiffness of the sediment. By considering hydrate as a trapped viscous phase, this study provides insights into the initial stress state and geomechanical evolution of hydrate-bearing reservoirs.
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
Energy & Fuels
Yi-Fei Sun, Bo-Jian Cao, Jin-Rong Zhong, Jing-Yu Kan, Rui Li, Jing-Shuo Niu, Hong-Nan Chen, Guang-Jin Chen, Guo-Zhong Wu, Chang-Yu Sun, Dao-Yi Chen
Summary: This study effectively improves the efficiency of natural gas extraction, increases the CH4 recovery rate, and achieves CO2 hydrate storage through reservoir reformation technology. The results show that this method is very promising.
