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Characteristics of Milankovitch cycles recorded in Eocene strata in the eastern depression of North Yellow Sea Basin, North China

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China Geology 2021年第2期4卷 274-287页

作者： Shu-yu Wu Jun Liu Jian-wen Chen Hao-ran Wu School of Engineering China University of GeoscienceWuhan 430074China Yantai Coastal Zone Geological Survey center China Geological SurveyYantai 264001China Chinese Academy of Geological Sciences Beijing 100037China The Key Laboratory of gas hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China

As cyclical orbital movements of Earth,Milankovitch cycles can be recorded in sedimentary *** time they reflect can be used to accurately divide and compare *** cycles recorded in strata enrich the stratigraphic theory,especially the theories of cycle stratigraphy,and thus they are widely used in geological survey engineering *** study explored the characteristics of the Milankovitch cycles recorded in the eastern depression of the North Yellow Sea Basin,highlighting their control over high-frequency stratigraphic *** Eocene Milankovitch cycles in the depression were calculated based on the method proposed by ***,and their parameters primarily include eccentricity cycles of 125 ka and 99 ka,obliquity cycles of 51 ka and 39 ka,and precession cycles of 23 ka and 19 *** analysis of gamma-ray(GR)and spontaneous potential(SP)log curves of the Eocene strata was carried out to divide and compare stratigraphic sequences,revealing that the spectral peaks correspond well to astronomical *** indicates that the strata in the depression fully record Milankovitch ***,there are long-,medium-,and short-term stratigraphic cycles in the eastern depression,with a thickness of 13.03-15.89 m,3.70-5.21 m,and 2.17-2.94 m,*** sedimentation rates of the Eocene strata were calculated to be 121.2-127.12 m/Ma *** the uplift to the center of the lacustrine basin along the slope in the eastern depression,both the sedimentation duration and the sediment thickness increase,while the sedimentation rate remains relatively *** Eocene strata can be divided into six stages of high-frequency sequences by continuous wavelet transformation,namely E_(6)-E_(1) from bottom to *** sedimentation duration and sedimentation rates of the sequences were calculated using spectral analysis with each of the sequences as a separate ***,the impacts of climate change on the sedimentary environm

关键词： Milankovitch cycle Sedimentation rate Sedimentation duration Geophysics Eocene Geological survey engineering Eastern depression North Yellow Sea Basin(NYSB)

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Stability analysis of seabed strata and casing structure during the natural gas hydrates exploitation by depressurization in horizontal wells in South China Sea

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China Geology 2022年第2期5卷 300-309页

作者： Peng-fei Xie Lin Yang Qian-yong Liang Xu-hui Zhang Liang-hua Zhang Bin Zhang Xiao-bing Lu Hui-ce He Xue-min Wu Yi-fei Dong Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510760China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China China University of Geosciences(Beijing) Beijing 100084China University of Chinese Academy of Sciences Beijing 100049China National Engineering Research center of gas hydrate Exploration and Development Guangzhou 511400China

Natural gas hydrates(NGHs)are a new type of clean energy with great development ***,it is urgent to achieve safe and economical NGHs development and *** study established a physical model of the study area using the FLAC^(3D) software based on the key parameters of the NGHs production test area in the South China Sea,including the depressurization method,and mechanical parameters of strata,NGHs occurrence characteristics,and the technological characteristics of horizontal ***,this study explored the law of influences of the NGHs dissociation range on the stability of the overburden strata and the casing structure of a horizontal *** results are as *** the dissociation of NGHs,the overburden strata of the NGHs dissociation zone subsided and formed funnelshaped zones and then gradually ***,the upper interface of the NGHs dissociation zone showed significant redistribution and discontinuity of ***,distinct stress concentration and corresponding large deformation occurred in the build-up section of the horizontal well,which was thus prone to suffering shear ***,apparent end effects occurred at the end of the horizontal well section and might cause the deformation and failure of the casing ***,it is necessary to take measures in the build-up section and at the end of the horizontal section of the horizontal well to prevent damage and ensure the wellbore safety in the long-term NGHs exploitation.

关键词： Natural gas hydrates(NGHs) Exploitation by depressurization Horizontal well Stratum subsidence Shear failure NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea

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Adhesion strength of tetrahydrofuran hydrates is dictated by substrate stiffness

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Petroleum Science 2024年第1期21卷 667-673页

作者： Yan-Wen Lin Tong Li Yi Zhang Wei-Wei Yan Xiao-Ming Chen Zhi-Sen Zhang Jian-Yang Wu Department of Physics Research Institute for Biomimetics and Soft MatterJiujiang Research Institute and Fujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen361005FujianChina Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201ZhejiangChina Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyang621000SichuanChina Micro-and Nano-technology Research center State Key Laboratory for Manufacturing Systems EngineeringXi’an Jiaotong UniversityXi’an710049ShaanxiChina Electronic Materials Research Lab Key Laboratory of the Ministry of EducationXi’an Jiaotong UniversityXi’an710049ShaanxiChina NTNU Nanomechanical Lab Norwegian University of Science and Technology(NTNU)Trondheim7491Norway

Understanding the hydrate adhesion is important to tackling hydrate accretion in ***,the relationship between the Tetrahydrofuran(THF)hydrate adhesion strength(AS)and surface stiffness on elastic coatings is systemically examined by experimental shear force measurements and theoretical *** mechanical factor-elastic modulus of the coatings greatly dictates the hydrate AS,which is explained by the adhesion mechanics theory,beyond the usual factors such as wettability and structural ***,the hydrate AS increases with reducing the thickness of the elastic coatings,resulted from the decrease of the apparent surface elastic *** effect of critical thickness for the elastic materials with variable elastic modulus on the hydrate AS is also *** study provides deep perspectives on the regulation of the hydrate AS by the elastic modulus of elastic materials,which is of significance to design anti-hydrate surfaces for mitigation of hydrate accretion in petro-pipelines.

关键词： hydrate Adhesion strength Elastic modulus Coatings

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Formation of the structure-Ⅱgas hydrate from low-concentration propane mixed with methane

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Chinese Journal of Chemical Engineering 2023年第6期58卷 306-314页

作者： Sanya Du Xiaomin Han Wenjiu Cai Jinlong Zhu Xiaobai Ma Songbai Han Dongfeng Chen Yusheng Zhao Hui Li Hailong Lu Xiaohui Yu Beijing Advanced Innovation center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Engineering Peking UniversityBeijing 100871China Beijing International center for gas hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China Department of Physics Southern University of Science and Technology(SUSTech)Shenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology(SUSTech)Shenzhen 518055China Songshan Lake Materials Laboratory Dongguan 523808China

It has been recognized that a small amount of propane mixed with methane can change greatly in not only the thermodynamics but also the structural properties of gas ***,its mechanism is still not well understood *** this research,structure-Ⅱ(sⅡ)hydrate is synthesized using a methanepropane gas mixture with an initial mole ratio of 99:1,and it is found that large(5~(12)6~4)cages are cooccupied by multiple gases based on the rigid structure analysis of neutron diffraction *** first principles calculation and molecular dynamics simulation are conducted to uncover the molecular mechanism for sⅡmethane-propane hydrate formation,revealing that the presence of propane inhibits the formation of structure-Ⅰ(sⅠ)hydrate but promotes sⅡhydrate *** results help to understand the accumulation mechanism of natural gas hydrate and benefit to optimize the condition for gas storage and transportation in hydrate form.

关键词： Multiple guest molecules Clathrates Neutron powder diffraction Structural transformation Molecular mechanism

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Molecular simulation study on the evolution process of hydrate residual structures into hydrate

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Chinese Journal of Chemical Engineering 2024年第5期69卷 79-91页

作者： Liwei Cheng Yunfei Li Jinlong Cui Huibo Qin Fulong Ning Bei Liu Guangjin Chen Faculty of Engineering China University of GeosciencesWuhan 430074China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China College of Science Nanchang Institute of TechnologyNanchang 330099China School of Chemical Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China National center for International Research on Deep Earth Drilling and Resource Development China University of Geosciences(Wuhan)Wuhan 430074China

The clathrate hydrate memory effect is a fascinating phenomenon with potential applications in carbon capture,utilization and storage(CCUS),gas separation,and gas storage as it can accelerate the secondary formation of clathrate ***,the underlying mechanism of this effect remains *** gain a better understanding of the mechanism,we conducted molecular dynamic simulations to simulate the initial formation and reformation processes of methane *** this work,we showed the evolution process of hydrate residual structures into hydrate *** simulation results indicate that the residual structures are closely related to the existence of hydrate memory effect,and the higher the contribution of hydrate dissociated water to the hydrate nucleation process,the faster the hydrate *** hydrate dissociation,the locally ordered structures still exist after hydrate dissociation and can promote the formation of cluster structures,thus accelerating hydrate ***,the nucleation process of hydrate and the formation process of clusters are *** size of clusters composed of cup-cage structures is critical for hydrate *** residence time at high temperature after hydrate decomposition will affect the strength of the hydrate memory *** simulation results provide microscopic insights into the occurrence of the hydrate memory effect and shed light on the hydrate reformation process at the molecular scale.

关键词： Memory effect Molecular simulation hydrate reformation Residual structures

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Study on Process Economics of Natural Resource Utilization

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Natural Resources 2016年第11期7卷 611-627页

作者： Wenfeng Hao Department of Chemical Engineering for Energy College of New Energy Shenyang Institute of Engineering Shenyang China center for Natural gas hydrate Research Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou China Institute of Adsorption and Inorganic Membrane State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian China

Finite supply of non-regenerative resources triggers a competition between economic entities or between areas, which requires the ways regarding their utilization with higher levels in science and the standards regarding their use with higher efficiency in economics. To solve a problem of process evaluation in science and of driving force in economics during a process design or a process run for natural resources utilization, a process evaluation parameter originated from natural gas hydrate preparation from a small scale to industrialization scale and the equation of the criterion dependent are introduced to evaluate a variety of processes of natural resources utilization. The analyses indicate that the parameter is relevant to internal undeveloped resources amount change with a stable mass composition in a virtual black box model and external variable market with an implication of process efficiency in economy or of process efficiency of resource utilization and that the parameter has similar features of the thermodynamic state functions. Moreover, the equation of the criterion provided is a difference between the value of the process evaluation parameter at the final state and the value of the process evaluation parameter at the initial state in an actual process, which can be used to determine the direction of development and to judge the size of the driving force in an actual process or an economical run. The provided examples and correlative mathematical description can guide how an identification for the undeveloped resources and a real-time adjustment of dynamic production for the developing resource are done and how decisions regarding resource exploitation, the venture forecasting of capital utilization and updating technology are made. The parameter used itself and the equation of the derived criterion can help by playing a predictive role for selecting the optimal use processes and for designing new process of the natural resource utilization or capital

关键词： Economics Criterion Natural Resources Utilization Process Evaluation Parameter Thermodynamics Driving Force

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High-Resolution Geochemical Records in the Inner Shelf Mud Wedge of the East China Sea and Their Indication to the Holocene Monsoon Climatic Changes and Events

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Journal of Ocean University of China 2021年第6期20卷 1409-1418页

作者： WANG Longsheng ZHOU Bin ZHENG Bang WANG Ke MEI Xi WANG Qing WANG Xiaohui ZHENG Hongbo Coast Institute of Ludong University Yantai 264025China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Yantai 264003China Department of Earth and Planetary Science Graduate School of ScienceThe University of TokyoTokyo 1130033Japan Key Laboratory of gas hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Research center for Earth System Science Yunnan UniversityKunming 650091China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China

The inner shelf mud wedge(ISMW)located in the East China Sea(ECS)is the fine-grained sedimentary area with high sedimentation rate and has provided an ideal study area for understanding the East Asian Summer Monsoon(EASM)evolution during the *** this paper,we presented the high-resolution geochemical data of the sediments from the core MD06-3040 in the ISMW of the ECS determined by X-ray fluorescence core scanning(XRF-CS)analysis,a high-resolution,continuous,and multielement *** and factor analysis results reveal that the variations of elemental compositions(Al,Si,K,Ti,Fe),the elemental ratios of Al/Zr,Ca/Ti and Rb/Sr,and the factor scores(F1 are correlated with the changes of the EASM during the period of 6000–1300 cal yr *** higher values of geochemical compositions indicating the terrigenous inputs implied the intensification of anthropogenic activities after 1300 cal yr ***,the significant decrease of most geochemical compositions and the F1 factor scores during 4500–3500 cal yr BP and 1700–1500 cal yr BP,within the dating errors,coincided with the weak EASM events(presumably drought and cold events).The spectral analysis results of K concentrations,Al/Zr ratios and F1 factor scores show the millennial and centennial climatic fluctuations,which are consistent with other marine sedimentary records in the adjacent *** the findings show that the geochemical compositions of sediments from core MD06-3040 are influenced by the EASM evolution,the variable El Niño/Southern Oscillation(ENSO)and the local oceanic thermohaline circulation(e.g.,Kuroshio Current).These results are greatly helpful in uncovering the forcing mechanism of the monsoonal climate in the east China over the Holocene and also contribute to the understanding of EASM variability.

关键词： Holocene climatic event East Asian Summer Monsoon XRF core scanning inner shelf mud wedge

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Interannual variability in the sea surface cooling induced by tropical cyclones in the South China Sea

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Acta Oceanologica Sinica 2021年第11期40卷 70-78页

作者： Juan Ouyang Chunhua Qiu Zhenhui Yi Dongxiao Wang Danyi Su Hong Liang Zihao Yang School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519020China Pearl River Estuary Marine Ecosystem Research Station Ministry of EducationZhuhai 519020China Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Zhuhai 519020China hydrate Engineering Technology center China Geological SurveyGuangzhou 510760China

Sea surface cooling induced by tropical cyclones(TCs)is an important component of air-sea *** coordinate transformation and composite analysis methods,we examined the interannual variability in TCinduced sea surface cooling(TCSSC)in the South China Sea(SCS).The frequency of surface cooling cases was over 86%and that of surface warming cases was less than 14%.The magnitude of TCSSC was defined as the absolute value of *** maximum magnitude of TCSSC occurred on the right side of the TC track,and the mean magnitude of TCSSC decreased by 0.04℃/a from 2006 to *** interannual variability in TCSSC was highly correlated with the TC translation speed and pre-TC mixed layer ***,TCSSC got enhanced in El Nino years of 2007,2010,and *** El Nino types were suggested to determine the occurring periods of strong TCSSC via controlling the positions of SCS anticyclones,which brought pre-TC shallow mixed layer and caused strong TCSSC via vertical mixing process during El Nino *** quantify how the anticyclone influences TCSSC,we need to use mixed layer heat balances model in the next study.

关键词： sea surface cooling tropical cyclone El Nino-Southern Oscillation(ENSO) South China Sea anticyclone

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Algal biomass as a global source of transport fuels:Overview and development perspectives

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Progress in Natural Science:Materials International 2014年第4期24卷 329-339页

作者： Kifayat Ullah Mushtaq Ahmad Sofia Vinod Kumar Sharma Pengmei Lu Adam Harvey Muhammad Zafar Shazia Sultana C.N.Anyanwu Department of Biosciences COMSATS Institute of Information TechnologyPark RoadChak ShahzadIslamabadPakistan Department of Plant Sciences Faculty of Biological SciencesQuaid-i-Azam UniversityIslamabadPakistan ENEA Research Centre Trisaia Technical Unit for Trisaia Technologies75026 Rotondella (MT)Italy 4. Key Laboratory of Renewable Energy and Gas HydrateGuangzhou Institute of Energy ConversionChinese Academy of SciencesNo.2Nengyuan RoadWushanTianhe 5. School of Chemical Engineering and Advanced MaterialsNewcastle UniversityMerz CourtNewcastle upon Tyne NE1 7RUUnited Kingdom 6. National center for energy research and developmentUniversity of NsukkaNigeria

As a result of the global fuel crisis of the early 1970 s,coupled with concerns for the environment,the use of biofuel has been on the increase in many regions throughout the *** present,a total of approximately 30 billion(30×109) liters of biofuel are utilized worldwide annually,although most countries rely hugely on the first generation *** limitations of the first and second generation biofuel gave rise to current interest in algae as a promising alternative to these conventional biofuel *** biomass could provide a lion’s share of the global transport fuel requirements in *** present review highlights some important developments in,and potentials of algaculture as a major biomass resource of the ***,the major constraint to commercial-scale algae farming for energy production is the cost factor,which must be addressed adequately before its potentials can be harnessed.

关键词： Algae Biofuel Economic feasibility Energy production Transport fuels

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Distributed optical fiber acoustic sensor for in situ monitoring of marine natural gas hydrates production for the first time in the Shenhu Area,China

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China Geology 2022年第2期5卷 322-329页

作者： Xiang-ge He Xue-min Wu Lei Wang Qian-yong Liang Li-juan Gu Fei Liu Hai-long Lu Yi Zhang Min Zhang Beijing International center for gas hydrate Peking UniversityBeijing 100871China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China School of Earth and Space Sciences Peking UniversityBeijing 100871China Dongguan Institute of Optics and Electronics Peking UniversityDongguan 523000China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China SinoProbe center Chinese Academy of Geological Sciences and China Geological SurveyMinistry of Natural ResourcesBeijing 100037China

The distributed acoustic sensor(DAS)uses a single optical cable as the sensing unit,which can capture the acoustic and vibration signals along the optical cable in *** it is suitable for monitoring downhole production activities in the process of oil and gas *** authors applied the DAS system in a gas production well in the South China Sea for in situ monitoring of the whole wellbore for the first time and obtained the distributed acoustic signals along the whole *** signals can clearly distinguish the vertical section,curve section,and horizontal production *** collected acoustic signal with the frequency of approximately 50 Hz caused by the electric submersible pump exhibit a signal-to-noise ratio higher than 27 *** analyzing the acoustic signals in the production section,it can be located the layers with high gas production *** an accurate physical model is built in the future,the gas production profile will be *** addition,the DAS system can track the trajectory of downhole tools in the wellbore to guide the *** the velocity analysis of the typical signals,the type of fluids in the wellbore can be *** successful application of the system provides a promising whole wellbore acoustic monitoring tool for the production of marine gas hydrate,with a good application prospect.

关键词： gas hydrate production monitoring Optical fiber sensor Distributed acoustic sensor In situ monitoring Fluid type NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea

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