首页|Deformation Characteristics of Hydrate-Bearing Sediments

Deformation Characteristics of Hydrate-Bearing Sediments

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The safe and efficient development of natural gas hydrate requires a deep understanding of the deformation behaviors of reservoirs.In this study,a series of triaxial shearing tests are carried out to investigate the deformation properties of hydrate-bearing sediments.Variations of volumetric and lateral strains versus hydrate saturation are analyzed comprehensively.Results indicate that the sediments with high hydrate saturation show dilative behaviors,which lead to strain-softening characteristics during shearing.The volumetric strain curves have a tendency to transform gradually from dilatation to compression with the increase in effective confining pressure.An easy prediction model is proposed to describe the relationship between volumetric and axial strains.The model coefficient β is the key dominating factor for the shape of volumetric strain curves and can be determined by the hydrate saturation and stress state.Moreover,a modified model is established for the calculation of lateral strain.The corresponding determination method is provided for the easy estimation of model coefficients for medium sand sediments containing hydrate.This study provides a theoretical and experimental reference for deformation estimation in natural gas hydrate development.

gas hydratedeformation characteristicsvolumetric strainlateral strainprediction model

DONG Lin、LI Yanlong、ZHANG Yajuan、HU Gaowei、LIAO Hualin、CHEN Qiang、WU Nengyou

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Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266237,China

Laboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao 266237,China

College of Oceanography,Hohai University,Nanjing 210098,China

College of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266555,China

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Qingdao Natural Science FoundationNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaLaoshan LaboratoryKey Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University

23-2-1-54-zyydjch4207621741 976074LSKJ202203506KLE-TJGE-G2202

2024

10.1007/s11802-024-5551-y

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(1)
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