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Natural gas hydrates-Insights into a paradigm-shifting energy resource

Energy Reviews 2023年第1期2卷 31-48页

作者： Shashika M.Gajanayake ranjith p.gamage Xiao-Sen Li Herbert Huppert Department of Civil Engineering Building 60Monash University Clayton CampusMelbourneVictoria 3800Australia Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou510640China Guangzhou Centre for Gas Hydrate Research Chinese Academy of SciencesGuangzhou510640China Institute of Theoretical Geophysics King's CollegeCambridge University CB21STUnited Kingdom

Experts have identified natural gas hydrates,which are found in the shallow seabed and beneath permafrost regions,as an energy source(mostly methane)that is greener than other petroleum fuel *** their worldwide distribution and abundance,gas hydrates have vast potential to become the next pillar of the energy *** no entity has established methane extraction from hydrates at a commercial scale yet,extensive laboratory experiments have introduced several extraction *** such as depressurization,thermal stimulation,and inhibitor injection are likely to disturb seabed integrity,which may result in catastrophic ***,the CO_(2)replacement method is inferred to be preserving the seabed stability,offering an opportunity to reduce anthropogenic CO_(2)emissions *** this paper,we provide a comprehensive review of the progress of experimental work in developing methane-extraction methods for gas hydrate *** combined with thermal stimulation can be proposed as a viable methane extraction method based on laboratory-scale experiments,however,a sustainable extraction method is yet to be developed to fieldscale when both economic and environmental perspectives are considered.A handful of field production runs have delivered positive outcomes to establish the exploitability of natural hydrate reservoirs,but thorough investigations and scientific collaborations are needed to develop hydrate accumulations as a commercially viable energy source.

关键词： Unconventional resources Natural gas hydrates Methane Dissociation methods CO_(2)replacement

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Bibliometric analysis of research challenges and trends in urban underground space

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Deep Underground Science and Engineering 2024年第2期3卷 207-215页

作者： You Zhang Liang Zheng Lingling He Yuyong Jiao Hanfa peng ranjith pgamage Faculty of Engineering China University of GeosciencesWuhanChina Department of Civil Engineering Monash UniversityClaytonVictoriaAustralia Sinohydro Engineering Bureau Co. LtdPower ChinaXiningChina 4Wuhan Geomatic InstituteWuhanChina

The utilization and development of urban underground space play a crucial role in optimizing the layout of civic architecture and enhancing the urban ecological environment,which contributes toward increasing the overall carrying capacity and promoting sustainable development in *** delve into the research progress of urban underground space,knowledge maps were created using the information visualization software *** literature was systematically extracted from three prominent databases,namely,Web of Science,Scopus,and China National Knowledge *** to the bibliometric analysis of the co-citation and core words co-occurrence,the trends and challenges of research on urban underground space were *** highlighted by the results obtained,it still remains highly challenging to achieve interdisciplinary collaboration in urban underground space research;the research trends of urban underground space consist of collaborative planning and whole life cycle sustainable development,multisource geological data informatization and resource evaluation,infrastructure design optimization,and intelligent *** knowledge map,drawn using bibliometric methods,offers a quantitative analysis of literature retrieval across various *** is recognized as an essential tool for exploring and identifying challenges and trends in urban underground space.

关键词： bibliometric analysis knowledge groups urban underground space VOSviewer

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Uncovering the creep deformation mechanism of rock-forming minerals using nanoindentation

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International Journal of Mining Science and Technology 2022年第2期32卷 283-294页

作者： Zhaoyang Ma Chengpeng Zhang ranjith pathegama gamage Guanglei Zhang Deep Earth Energy Laboratory Building 60Monash UniversityMelbourneVictoria 3800Australia State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Department of Earth Science and Engineering Imperial College LondonLondon SW72BPUK

The creep phenomenon of rocks is quite complex and the creep mechanisms are far from being well *** laboratory creep tests have been carried out to determine the creep deformation of various rocks,these tests are expensive and *** creep tests,as an alternative method,can be performed to investigate the mechanical and viscoelastic properties of granite *** this study,the reduced Young’s modulus,hardness,fracture toughness,creep strain rate,stress exponent,activation volume and maximum creep displacement of common rock-forming minerals of granite were calculated from nanoindentation *** was found that the hardness decreases with the increase of holding time and the initial decrease in hardness was swift,and then it decreased *** stress exponent values obtained were in the range from 4.5 to 22.9,which indicates that dislocation climb is the creep deformation *** addition,fracture toughness of granite’s rock-forming minerals was calculated using energy-based method and homogenization method was adopted to upscale the micro-scale mechanical properties to macro-scale mechanical *** but not least,both three-element Voigt model and Burgers model fit the nanoindentation creep curves *** study is beneficial to the understanding of the long-term mechanical properties of rock samples from a microscale perspective,which is of great significance to the understanding of localized deformation processes of rocks.

关键词： Nanoindentation Granite Time-dependent creep Stress exponent Strain rate sensitivity Fracture toughness

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Effect of sample size on the fluid flow through a single fractured granitoid

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第3期8卷 329-340页

作者： Kunal Kumar Singh Devendra Narain Singh ranjith pathegama gamage Geohazards and Engineering Geology Division Geological Survey of India Bandlaguda Hyderabad 500068 India Geotechnical Engineering Division Department of Civil Engineering Indian Institute of Technology Bombay Powai Mumbai 400076 India Department of Civil Engineering Monash University Clayton Melbourne Vic 3800 Australia

Most of deep geological engineered structures, such as rock caverns, nuclear waste disposal repositories, metro rail tunnels, multi-layer underground parking, are constructed within hard crystalline rocks because of their high quality and low matrix permeability. In such rocks, fluid flows mainly through fractures. Quantification of fractures along with the behavior of the fluid flow through them, at different scales, becomes quite important. Earlier studies have revealed the influence of sample size on the confining stress-permeability relationship and it has been demonstrated that permeability of the fractured rock mass decreases with an increase in sample size. However, most of the researchers have employed numerical simulations to model fluid flow through the fractureJfracture network, or laboratory investigations on intact rock samples with diameter ranging between 38 mm and 45 cm and the diameter-to-length ratio of 1：2 using different experimental methods. Also, the confining stress, 03, has been considered to be less than 30 Mpa and the effect of fracture roughness has been ignored. In the present study, an extension of the previous studies on ＂laboratory simulation of flow through single fractured granite＂ was conducted, in which consistent fluid flow experiments were performed on cylindrical samples of granitoids of two different sizes （38 mm and 54 mm in diameters）, containing a ＂rough walled single fracture＂. These experiments were performed under varied confining pressure （03 - 5-40 Mpa）, fluid pressure （fp ≤ 25 Mpa）, and fracture roughness. The results indicate that a nonlinear relationship exists between the discharge, Q, and the effective confining pressure, σeff., and Q decreases with an increase in σeff.. Also, the effects of sample size and fracture roughness do not persist when O＇eff. ≥ 20 Mpa. It is expected that such a study will be quite useful in correlating and extrapolating the laboratory scale investigations to in-situ scale and further imp

关键词： Rock massSingle fractureFluid flowSample sizeSize effectFracture roughness

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