检索结果-南通市图书馆

Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea

引用

Chinese Science Bulletin 2006年第10期51卷 1228-1237页

作者： CHEN Zhong1,2,3, YAN Wen1,2,3, CHEN Muhong1,3, WANG Shuhong1,2,3, LU Jun1,3, ZHANG Fan1,3, XIANG Rong1,3, XIAO Shangbin1,3, YAN Pin1,2,3 & GU Senchang1,2,3 1. South China Sea Institute of Oceanology, Chinese Academy of Sci-ences, Guangzhou 510301, China 2. Guangzhou center for gas hydrate Research, Chinese Academy of Sciences, Guangzhou 510301, China 3. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology and Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510301, China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou China Guangzhou center for gas hydrate Research Chinese Academy of Sciences Guangzhou China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology and Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China

Seep carbonate nodules were firstlycollected from the southwestern Dongsha area onnorthern continental slope of South China Sea formineralogical and geochemical studies. The resultsof X-ray diffraction show that carbonate nodules arecomposed of Fe-rich domolite,siderite and a few cal-cite and aragonite, as well as a small quantity ofnon-carbonate minerals such as goethite, quartz andclay minerals. Fe-rich dolomite and siderite charac-terized by euhedral microcrystalline structure weredirectly precipitated at cold seeps. The δ 13C valuesfor Fe-rich dolomite and siderite in the bulk nodulesvary from ?18.24‰ to ?36.07‰, and the δ 18O valuesrange from 0.42 to 2.76‰. Their moderate depleted13C reflects that carbon origin is possibly thermoge- netic gas or mixed gas, which is evidence of gasventings in the seafloor. Moreover, massive wormtube fossils related to cold seeps were found on thesurfaces of carbonate nodules, and the conduitsand/or channels in semi-solidified nodules whichwere not filled by carbonate or sediment were alsoobserved. A preliminary conclusion is that activemicro gas venting with a conduit/channel diameterrange from 200 μm to 600 μm possibly exists inmodern seafloor of the carbonate nodule area.

关键词：渗出碳酸盐节碳氧同位素甲烷渗漏天然气水化物

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on detecting main ingredients of silicone rubber based on terahertz spectrum

引用

High Voltage 2024年第3期9卷 518-527页

作者： Hongwei Mei Lanxin Li Fanghui Yin Liming Wang Masoud Farzaneh Shenzhen International Graduate School(SIGS) Tsinghua UniversityShenzhenGuangdongChina Kunming Power Exchange center KunmingYunnanChina Department of Applied Sciences(DSA) University of Quebec at ChicoutimiChicoutimiQuebecCanada

The authors investigated the ingredient detection technique of silicone rubber based on the Terahertz *** this purpose,18 diverse high-temperature vulcanised silicone rubber(HTVSR)formulations were customised,8 of which are used as calibration set while the rest 10 as prediction *** on the Beer-Lambert Law,the partial-least-square(PLS)regression model and the least-squares support-vector machines(LS-SVM)regression model were used to yield the relationships between the absorption spectrums and the content percentages of polydimethylsiloxane(PDMS),alumina tri-hydrate(ATH),and silica in *** results showed that for the formulations tested,the prediction accuracy of all three main ingredients by the PLS regression model could be improved by changing the spectrum range from 0.2–4 to 0.5–2 *** the data were pre-processed by the Savitzky–Golay smoothing method or multiplicative scatter correction method,the prediction accuracy of PDMS could be further ***,this would lead to a slight decrease in the prediction accuracy of *** the LS-SVM regression model,the radial basis function(RBF)kernel and the linear kernel were *** was found that the prediction accuracy of both kernels was better than that of the PLS regression *** the LS-SVM regression model using the RBF kernel,the correlated coefficients of PDMS and ATH in the prediction set could be up to 0.9915 and 0.9742,respectively.

关键词： rubber spectrum kernel

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Migration and accumulation characteristics of natural gas hydrates in the uplifts and their slope zones in the Qiongdongnan Basin,China

引用

China Geology 2022年第2期5卷 234-250页

作者： Yu-lin He Jin-qiang Liang Zeng-gui Kuang Wei Deng Jin-feng Ren Hong-fei Lai Miao-miao Meng Wei Zhang Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China National Engineering Research center of gas hydrate Exploration and Development Guangzhou 511458China

Various factors controlling the accumulation of natural gas hydrates(NGHs)form various enrichment and accumulation modes through organic *** study mainly analyzes the geological and geophysical characteristics of the NGHs occurrence in the uplifts and their slope zones within the deep-water area in the Qiongdongnan(QDN)Basin(also referred to as the study area).Furthermore,it investigates the dominant governing factors and models of NGHs migration and accumulation in the study *** results are as follows.(1)The uplifts and their slope zones in the study area lie in the dominant pressure-relief direction of fluids in central hydrocarbon-rich sags in the area,which provide sufficient gas sources for the NGHs accumulation and enrichment through pathways such as gas chimneys and faults.(2)The top and flanks of gas chimneys below the bottom simulating reflectors(BSRs)show high-amplitude seismic reflections and pronounced transverse charging of free gas,indicating the occurrence of a large amount of gas accumulation at the heights of the uplifts.(3)Chimneys,faults,and high-porosity and high-permeability strata,which connect the gas hydrate temperature-pressure stability zones(GHSZs)with thermogenic gas and biogenic gas,form the main hydrate migration system.(4)The reservoir system in the study area comprises sedimentary interlayers consisting of mass transport deposits(MTDs)and *** addition,the reservoir system has developed fissure-and pore-filling types of hydrates in the *** above well-matched controlling factors of hydrate accumulation enable the uplifts and their slope zones in the study area to become the favorable targets of NGHs exploration.

关键词： gas chimney Overpressure Migration characteristics of gas hydrates Accumulation characteristics of gas hydrates Oil and gas exploration engineering NGHs exploration trial engineering Uplifts and slope zones Qiongdongnan Basin China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Shale Reservoir Characteristics on Shale Oil Movability in the Lower Third Member of the Shahejie Formation, Zhanhua Sag

引用

Acta Geologica Sinica(English Edition) 2020年第2期94卷 352-363页

作者： NING Chuanxiang MA Zhongliang JIANG Zhenxue SU Siyuan LI Tingwei ZHENG Lunju WANG Guozhen LI Fengxun State Key Laboratory of Shale Oil and gas Enrichment and Effective Development Wuxi 214126.JiangsuChina Wuxi Research Institute of Petroleum GeologySinopec Exploration and Production Research Institute Wuxi 214126JiangsuChina Unconventional Natural gas Institute China University of PetroleumBeijing 102249China College of Earth Science.Jilin University Changchun 130012China Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral Shandong University of Science and TechnologyQingdao 266590China gas hydrate Engineering Technology center Guangzhou Marine Geological SurveyGuangzhou 510075China

To reveal the effect of shale reservoir characteristics on the movability of shale oil and its action mechanism in the lower third member of the Shahejie Formation(Es3l), samples with different features were selected and analyzed using N2 adsorption, high-pressure mercury injection capillary pressure(MICP), nuclear magnetic resonance(NMR), high-speed centrifugation, and displacement image techniques. The results show that shale pore structure characteristics control shale oil movability directly. Movable oil saturation has a positive relationship with pore volume for radius > 2 μm, as larger pores often have higher movable oil saturation, indicating that movable oil is present in relatively larger pores. The main reasons for this are as follows. The relatively smaller pores often have oil-wetting properties because of organic matter, which has an unfavorable effect on the flow of oil, while the relatively larger pores are often wetted by water, which is helpful to shale oil movability. The rich surface provided by the relatively smaller pores is beneficial to the adsorption of immovable oil. Meanwhile, the relatively larger pores create significant pore volume for movable oil. Moreover, the larger pores often have good pore connectivity. Pores and fractures are interconnected to form a complex fracture network, which provides a good permeability channel for shale oil flow. The smaller pores are mostly distributed separately;thus, they are not conducive to the flow of shale oil. The mineral composition and fabric macroscopically affect the movability of shale oil. Calcite plays an active role in shale oil movability by increasing the brittleness of shale and is more likely to form micro-cracks under the same stress background. Clay does not utilize shale oil flow because of its large specific surface area and its block effect. The bedding structure increases the large-scale storage space and improves the connectivity of pores at different scales, which is conducive t

关键词： shale oil movability shale reservoirs pore structure characteristics lower third member of the Shahejie Formation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Interactions of Microplastics and Methane Seepage in the Deep-Sea Environment

引用

Engineering 2023年第10期29卷 159-167页

作者： Jing-Chun Feng Zhifeng Yang Wenliang Zhou Xingwei Feng Fuwen Wei Bo Li Chuanxin Ma Si Zhang Linlin Xia Yanpeng Cai Yi Wang Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Guangdong Provincial Key Laboratory of Water Quality Improvement and Ecological Restoration for Watersheds Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Key Laboratory of gas hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou center for gas hydrate Research Chinese Academy of SciencesGuangzhou 510640China

Microplastics(MPs)are important exempla of the Anthropocene and are exerting an increasing impact on Earth’s carbon *** huge imbalance between the MPs floating on the marine surface and those that are estimated to have been introduced into the ocean necessitates a detailed assessment of marine MP ***,we demonstrate that cold seep sediments,which are characterized by methane fluid seepage and a chemosynthetic ecosystem,effectively capture and accommodate small-scale(gas hydrates.

关键词： Microplastics Anaerobic oxidation of methane Cold seeps Diversity index Fragmentation gas hydrates

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Use of Electrical Resistance to Detect the Formation and Decomposition of Methane hydrate

引用

Journal of Natural gas Chemistry 2007年第4期16卷 399-403页

作者： Xitang Zhou Shuanshi Fan Deqing Liang Donglei Wang Ningsheng Huang Guangzhou center for gas hydrate Research Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510650 Guangdong China The Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of Education South China University of Technology Guangzhou 510650 Guangdong China Graduate University of Chinese Academy of Sciences Beijing 100059 China School of Chemical Engineering Maoming University Maoming 525000 Guangdong China

The changes of electrical resistance （R） were studied experimentally in the process of CH4 hydrate formation and decomposition, using temperature and pressure as the auxiliary detecting methods simultaneously. The experiment results show that R increases with hydrate formation and decreases with hydrate decompositon. R is more sensitive to hydrate formation and decompositon than temperature or pressure, which indicates that the detection of R will be an effective means for detecting natural gas hydrate （NGH） quantitatively.

关键词： methane hydrate formation decomposition electrical resistance detection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Economic Critical Resources for the Industrial Exploitation of Natural gas hydrate

引用

Acta Geologica Sinica(English Edition) 2022年第2期96卷 663-673页

作者： CHEN Xuejun LU Hailong ZHANG Jiecheng YE Jianliang XIE Wenwei College of Engineering Peking UniversityBeijing 100871China Institute of Ocean Research Peking UniversityBeijing 100871China Beijing International center for gas hydrate School of Earth and Space SciencesPeking UniversityBeijing 100871China Institute for Marine Science and Technology Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China Guangzhou Marine Geological Survey Guangzhou 510075China

Since the implementation of several pilot production tests were in natural gas hydrate(NGH) reservoirs in terrestrial and marine settings, the study of NGH has entered a new stage of technological development for industrial exploitation. Prior to the industrial exploitation of any given NGH reservoir, the economic feasibility should be examined. The first step of economic evaluation of a NGH reservoir is to know whether its resource amount meets the requirement for industrial exploitation. Unfortunately, few relevant studies have been conducted in this regard. In this study, the net present value(NPV) method is employed to estimate the economic critical resources required for the industrial exploitation of NGHs under different production scenarios. Sensitivity analysis is also performed in order to specify the effects of key factors, such as the number of production wells, gas price, technological improvement and tax incentive, on the economic critical resources. The results indicate that China requires the lowest economic critical resource for a NGH reservoir to be industrially exploited, ranging from 3.62 to 24.02 billion m3 methane. Changes in gas price and tax incentives also play significant roles in affecting the threshold and timeline for the industrial exploitation of NGH.

关键词： natural gas hydrate industrial exploitation economic critical resource net present value recovery factor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A fast identification method based on the typical geophysical differences between submarine shallow carbonates and hydrate bearing sediments in the northern South China Se a

引用

China Geology 2020年第1期3卷 16-27页

作者： Jin-qiang Liang Wei Deng Jing-an Lu Zeng-gui Kuang Yu-lin He Wei Zhang Yue-hua Gong Jin Liang Miao-miao Meng Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510760China Natural gas hydrate Engineering Technology center China Geological SurveyMinistry of Natural ResourcesGuangzhou 510760China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China

Bottom simulating reflector(BSR)has been recognized as one of the indicators of gas ***,BSR and hydrate are not one-to-one *** the Xisha area of South China Sea(SCS),carbonate rocks wildly develop,which continuously distribute parallel to the seafloor with high amplitude on seismic sections,exhibiting reflections similar to BSRs in the Shenhu area *** phenomenon causes some interference to hydrates *** this paper,the authors discussed the typical geophysical differences between carbonate rocks and hydrates,indicating that the main difference exists in relationship between porosity and velocity,causing different amplitude versus offset(AVO)*** the authors proposed a new model assuming that the carbonates form the matrix and the hydrate fill the pore as a part of the *** key modeling parameters have been optimized constrained by Pvelocities and S-velocities simultaneously,and the model works well both for carbonate rock and gas hydrate bearing *** quantitative identification,the authors calculated the velocities when carbonates and hydrates form the matrix together in different *** they proposed a carbonate and hydrate identification template(CHIT),in which the possible hydrate saturation(PHS)and possible carbonate content(PCC)can be both scaled out for a group of sample composed by P-velocity and *** PHS is far larger than PCC,it is more likely to be a hydrate sample because carbonates and hydrates do not coexist *** real data application shows that the template can effectively distinguish between hydrates and carbonate rocks,consequently reducing the risk of hydrate exploration.

关键词： gas hydrate Carbonate Rock physics Fast identification South China Sea gas hydrate exploration engineering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical studies of gas hydrate evolution time in Shenhu area in the northern South China Sea

引用

China Geology 2019年第1期2卷 49-55页

作者： Yun-xin Fang Jing-an Lu Jin-qiang Liang Zeng-gui Kuang Yun-cheng Cao Duo-fu Chen Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China gas hydrate Engineering Technology center China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Shanghai Engineering Research center of Hadal Science and Technology College of Marine ScienceShanghai Ocean UniversityShanghai 201306China

Although the Shenhu sea area has been a topic and focus of intense research for the exploration and study of marine gas hydrate in China, the mechanism of gas hydrate accumulation in this region remains controversial. The formation rate and evolution time of gas hydrate are the critical basis for studying the gas hydrate formation of the Shenhu sea area. In this paper, based on the positive anomaly characteristics of chloride concentration that measured in the GMGS3-W19 drilling site is higher than the seawater value, we numerically simulated the gas hydrate formation time of GMGS3-W19 site. The simulation results show that the gas hydrate formation rate positively correlates with the chloride concentration when the hydrate reaches the measured saturation. The formation time of gas hydrate in the GMGS3-W19 site is approximately 30 ka. Moreover, the measured chloride concentration is consistent with the in-situ chloride concentration, indicating that the formation rate of gas hydrate at the GMGS3-W19 site is very fast with a relatively short evolution time.

关键词： Shenhu South China Sea Numerical simulation Formation rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application and evaluation of layering shear method in LADCP data processing

引用

Acta Oceanologica Sinica 2023年第12期42卷 9-21页

作者： Zijian Cui Chujin Liang Binbin Guo Feilong Lin Yong Mu Ocean College Zhejiang UniversityZhoushan 316021China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Marine Sciences Nanjing University of Information Science&TechnologyNanjing 210044China National Engineering Research center of gas hydrate Exploration and Development Guangzhou Marine Geological SurveyGuangzhou 510760China

The current velocity observation of LADCP(Lowered Acoustic Doppler Current Profiler)has the advantages of a large vertical range of observation and high operability compared with traditional current measurement methods,and is being widely used in the field of ocean *** and inverse methods are now commonly used by the international marine community to process LADCP data and calculate ocean current *** two methods have their advantages and *** shear method calculates the value of current shear more accurately,while the accuracy in an absolute value of the current is *** inverse method calculates the absolute value of the current velocity more accurately,but the current shear is less *** on the shear method,this paper proposes a layering shear method to calculate the current velocity profile by“layering averaging”,and proposes corresponding current calculation methods according to the different types of problems in several field observation data from the western Pacific,forming an independent LADCP data processing *** comparison results have shown that the layering shear method can achieve the same effect as the inverse method in the calculation of the absolute value of current velocity,while retaining the advantages of the shear method in the calculation of a value of the current shear.

关键词： LADCP data processing layering shear method Western Pacific

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：